HUO LONG BIOGAS LTD. Commercial offer. Biogas plant.

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1 HUO LONG BIOGAS LTD. Commercial offer. Biogas plant. 2012

2 Content: 1 Technology description 2 Equipment 3 Project implementation terms

3 Technology description Technology of anaerobic digestion is based on a process of gradual oxidation of carbonaceous compounds performed by different groups of anaerobic microorganisms. At the diagram below main stages of organic substrates decomposition by complexes of microorganisms are shown. First stage (hydrolytic) is performed by verity of microorganisms (facultative and obligatory anaerobes), during this stages energy is mostly consumed. Production of energy takes place at second stage (digestion or acidogenic stage) and performed by the same group of bacteria of the first stage in cooperation with some other types (lactobacillus, streptococcus etc.), that do not transform polymers as they do not have exoenzymes for hydrolysis of polymers. Usually these two stages are considered together as they are interfaced in terms of energy balance. Third stage (acidogenesis) is mainly forms acetate. Fourth stage (methanogenesis) is the stage for methane formation. Methane (СН 4 ) and carbon dioxide (СO 2 ) formation 4th stage 3rd stage Monomers and oligomers (sucrose, glucose, amino acids, fats, acids) 2nd stage Biological polymers (cellulose, starch, protein, fat, lignin, peptin) Acetate, СО 2, Н 2, methanol, formate, ethanol, lactate, propionate) 1st stage

4 During the process of recycling of organic substrates in biological reactors artificial ecosystems are created and supported in order to perform most efficient conversion of organics into biogas. Due to the high concentrations and constant feeding of organics, constant and even mixing, support of constant temperature inside the digester microorganisms have ability for quick consumption and conversion of organic substances. Such conditions cause massive development of all types of anaerobic organisms participating in the chain of biomass destruction including methanogenic bacteria. Minor inclusions of oxygen that comes with fresh material into the digester are effectively used by aerobic bacteria and facultative anaerobic bacteria. In order to reach quick conversion of complex organic compounds (in fresh material) into methane technological process ensures as much as possible high bacterial number inside the digester. Concentration of bacteria inside digester reaches 5,2 6, cell./g, 2, cell./г, cell./ml. In general technological systems of biogas plant automatically control and direct all systems to support all vital parameters for anaerobic digestion of organic materials (temperature, ph, substrate dosing, mixing). Produced biogas is collected to gas holders and after some conditioning is used as fuel for gas engine that moves electric generator and produces electric and heat power.

5 Equipment Mixers Biogas agitators are used to thoroughly mix renewable raw materials, liquid manure and other substrates that are used for biogas production in biogas digesters, secondary fermenters and final storage tanks. For biogas plant smooth operation, it is essential to ensure efficient circulation inside the fermenter. Agitators for biogas plants facilities are designed specifically for agitation work in the fermenter. Optimum fermentation is achieved through mixing that is not detrimental to bacteria which performed by means of special propeller. Settled matter and floating scum layers are avoided and the gases are removed by agitation. Agitators are produced and sealed in a modular basis.. Individual agitator components - such as propeller, bearings, tube, hitch frame, drive shaft, seals are flexible. This allows also building customized solutions for certain projects. All the equipment parts maintenance friendly. Depending on technological solution and type of substrate mixing equipment can be supplied in two variants. Mixers that are mounted outside the digester wall (external mixer), and submersible mixers. Both types of mixing systems ensure effective substrate mixing, reliable in operation and have long-term operational period. Wall mounted mixer Submersible mixer Inclined mixer

6 Gasholder Gasholder Gas holder is design to store biogas and other gases produced by means of anaerobic digestion. Gas holder structure consists of external protection film, internal membrane gas holder, pressure control system, safety system and other auxiliary equipment. Production technology allows produce materials highly resistant to cold and still secure low production costs. Gas holder produced from special materials with minimum lifetime of 1-15 years. Also optional typhoon coating can prolong system lifetime up to 50 years. Gas holder system has low weight and can be installed on any structure, which makes installation cost very low thanks to quick installation. Distinctive feature of the system is simplicity of installation, easy maintenance, and long operational period.

7 Separator Separator Separator is used to separate solid and liquid fractions from digested biomass. Separator is filled by pump from collection tank. Loading chamber equipped with oscillation device that performs initial separation by means of vibration, which increases efficiency of separation of considerably solid substrates. Screw press blades are moving separated substrate to the separator exit. Design structure of sieve allows prevention of substrate corks. Pressure at first part of the sieve is not significant, but it gradually increases with concentration of solids and substrate movement to the exit of the separator. Substrate friction in cylindrical nozzle and exit double regulation valve make resistance at the exit of solid fraction thus compacting substrate. The rate of compaction is adjusted by number of counterbalances. Dry matter content in separated biomass is from 25% to 30%, this value can be adjusted. Screw separators can be equipped with electric drives with reduction gear from 4,0 kw to 11 kw. Thanks to level switches completely automatic mode of separator operation is possible. Separator has integrated cleaning system and does not require water for system washing. At the moment substrate is not supplied separator switches off automatically.

8 Heat supply station Biogas plant heating system Mesophilic digestion mode is performed at С. In order to secure live activity of microorganisms it constant temperature support with this rang is required. For that purpose biogas plant is equipped with digesters heating system. Depending on biogas plant option heat power is supplied by cogenerator or by burning biogas in a boiler. Boilers are usually installed in technical building. Digester heating system is installed inside the concrete bottom and mounted on digester wall. Heating system consists of circulation pumps, temperature regulators, check valves, temperature and pressure sensors, stop valves, membrane tank for water heat extension compensation. System feeding is done from separate tank with polypropylene glycol solution. Heating mains are laid in earth trench and made of polyethylene pipes with heat insulation and cover layers.

9 Gas conditioning system Gas conditioning system Gas system of biogas plant consists of biogas conditioning system and underground gas pipeline system that transport biogas from digester to cogenerator or biogas treatment system. Biogas conditioning systems comprises locking devices, safety systems and condensate collector. Biogas temperature and humidity reduction is performed by underground gas pipelines, calculated for a certain length. Condensate is collected to condensate well and then pumped to lagoon or to mobile cistern. Gas pipelines are made of polyethylene pipes, locking device are also underground and do not require any service. Locking device lever is made on the surface. Safety devices are installed on digesters and serve to warn in case of excessive pressure in gas holder or gas pipeline. Sulphur is removed from biogas at gas conditioning system by means of addition of precise air portion into the digester.

10 Automation system Automation system Biogas plant automation complex as well as control systems are developed by leading producers in Asia. Automation complex is supplied assembled and is adjusted during the biogas plant startup. All running processes and parameters are controlled automatically. Automation system can be equipped by internet data transfer module, which allows remote control over the biogas plant parameters from any point in the world that has internet access. Software supplied with automatics is specially developed for control and manage complete equipment system and biological processes in automatic or manual modes.

11 Digester Anaerobic digester Biogas digester is made of steel plates produced of steel with high quality coating made according to technology of high-temperature sintering "enamel". Such coating has long lifetime and is resistant to chemical exposure, corrosion and is impact-resistant. Such structure can be quickly mounted. Advantage of steel tanks if compared to concrete tanks is that they have long lifetime, do not need falsework during the installation, quick installation, and possibility of construction at any time of the year. Also one of advantages of steel tanks is that it can be quickly dismantled and is considered as a good mortgage by the bank. When digester is made of steel plates round shaped concrete bottom for steel tank mounting must be prepared before the installation. Steel plates are covered with several layers of special anticorrosive enamel, which ensures long lifetime of the tank. All embedded parts, manholes, mixers holes are produced according to the system peculiarities. Digester bottom has 2% inclination to the center for better mixing and substrate discharge. For complete discharge of substrate digester bottom is equipped with discharge pipe. Heating system is mounted on digester walls in order to ensure biomass heating to С and secure mesophilic digestion mode. Outside digester wall is heat insulated with the blocks made of extruded foamed polystyrene, which allows heat saving and reduces heat power consumption for digester heating. Underground part of the digester bottom or wall has hydro insulation. Heat insulation of the external side of the digester wall is protected from the mechanical damages with the help of profiled steel sheets.

12 Biogas flare The purpose of biogas flare is to burn biogas in cases there is no possibility to utilize it in co-generator, biogas treatment system or its usage for heating, thus avoiding gas leakage into atmosphere. Biogas flare is comprised of burning system and additional systems. Burning system consists of flame protection tube, injector, bearing structure, ignition system and flame control system. Bearing structure supports burner and vertically installed nozzle. According to customers request steel plate nozzle protection can be installed. Nozzle consists of electric driven valve (slow opening, fast closing, and closing at electricity absence functions), flame arrester and two membrane switches. Burning control system is installed in cabinet that is mounted on flare bearing structure. Excessive biogas is burned as soon as system gets signal. Usually this signal is supplied by gas holder filling censor. At the moment gas holder reaches its critical pressure corresponding signal is directed to biogas flare. After that flame control system initiates ignition and opens electric driven valve to start burning.

13 Co-generator Co-generator in silent and all weather container Co-generator Optionally biogas plant can be equipped with different systems according to the client s desire and aim. One of the main types of biogas utilization is production of electric and heat power by means of co-generation unit. Biogas is used as a fuel. Engine moves alternator. Heat from engine cooling system and exhaust gas is recovered by heat exchangers system and is supplied to the consumer in the form of hot water (90С). Total efficiency of co-generator reaches 80-85%. Co-generators are equipped with engines of famous USA brand Cummins. Cummins engines produced at assembly line in China are complete analog of engines produced in USA in terms of quality and reliability.

14 Terms of project implementation Payment terms Down payment (after contract is signed) 50% When equipment is ready for shipment (delivery terms FOB Shenzhen) 40% Before installation 10% Implementation period Months Design x Construction Equipment supply x x Installation and start-up x

15 Huo Long Biogas Ltd. Suite 301, Dina House, Ruttonjee Centre, 11 Duddel street,central, Hong Kong Web:

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