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                    Orbod Energy-Mini Thermal Power Plant (MTPP) on Biomass

Energy-saving technologies and Mini-CHPP (MTPP) using various types of fuel

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Mini-CHP on local fuels

Below is a description of the options for mini-CHP based on steam backpressure and condensing turbines with a unit electrical power of 300 - 3000 kW with wood waste boilers.

1. General solutions.

1.1. Boiler room of the Mini-CHP.

The boiler room of the mini-CHP is a room in which boilers with pre-furnaces or with "fluidized bed" furnaces and fuel feed bins are located, groups of feed pumps, a chemical water treatment and deaeration unit, and groups of feed pumps. In the boiler room there is a room for the operator's room and the room for the service personnel of the Mini-CHP.

1.2. Turbine hall of Mini-CHP.

 

The turbine hall of the Mini-CHPP is usually located in a separate room either attached to the boiler room or built nearby.

The choice of a particular layout scheme for the equipment of the Mini-CHPP depends on the capabilities and tasks solved by the customer. The mini-CHP plant can be implemented in a modular design: a boiler-turbine or with a common steam header. According to the second option, the number of turbines can be any, but an even number of turbines is preferred. In addition to the turbine equipment, the turbine room may contain heat exchangers for heating water, elements of the electrical circuit of the Mini-CHP (synchronizers, generator switches, etc.)

An important issue of the layout and cost of the Mini-CHPP is the issue of choosing the type of turbine: back-pressure or condensing with production and / or heating extractions.

When choosing a condensing turbine, it is necessary to solve the issue of condensate cooling, i.e. whether the circulating water will come directly from the reservoir or whether it is necessary to build a fan cooling tower.

1.3. Fuel economy and removal of combustion products.

The fuel economy of the mini-CHPP is a fuel storage of prepared fuel with a moving floor system (rods, pushers, hydraulic cylinders, an oil station), a main scraper conveyor for feeding fuel to the boiler room supply bunker, a group of closed fuel augers for supplying fuel from the supply bunker to the receiving bins boilers, receiving bunkers of boilers.
Finished fuel in the form of fine-grained shavings is fed by a dump truck to the floor of the warehouse, from where it collides with a bulldozer onto the moving floor. With the help of pushers of the moving floor, the fuel is fed to the scraper conveyor, through which it is delivered to the supply hopper of the boiler room. From the supply hopper, the fuel is fed through the augers to the boiler furnaces.

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After the boiler, flue gases are discharged by fans into a self-supporting multilateral chimney. Ash is removed from flue gases in multi-cyclones installed near boilers.

The fuel combustion process is adjusted in such a way as to ensure maximum fuel combustion. Ash after boilers and multicyclones is removed from the boiler room by closed augers installed below the floor level in channels into the ash collection tank, which is emptied as it is filled.

1.4. Automation and control of mini-CHP.

The mini-CHP is built with a high level of automation, allowing it to work automatically without operator intervention. Local automation systems of the turbine hall, boiler hall are combined into a common upper level with the output of signals to the dispatching console. The dispatching console displays mnemonic diagrams of the mini-CHP plant with an indication of the nominal and actual operating parameters.

The joint work of automation systems allows you to regulate the supplied electric and thermal power, automatically control the fuel supply system from the moving floor systems, to regulate the steam flow from boilers

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Please contact us for information.

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