Sustainable development and the need for clean energy often are a battlefield as it combines contrasting interests. It is taking that into consideration that we have developed a system capable of cogenerating, starting from virgin wood resulting from forest management, electricity and heat without producing air pollution. A system that, thanks to the small obstruction, can be placed also in the vicinity of wooded areas, relocating the production of energy and guaranteeing added value to all the areassearching for new development, as well as a significant reduction in transport costs and supply.
The plant is designed for a continuous 24-hour service 24, and is equipped with the innovative technology of pyrogasification based on the construction technique of semplified dual-stage gas that uses air as an fluidizing component (Patent no. 0001415899). This new patented technology has enabled us to re-start wood biomass systems of other companies and to design and implement our complete plant. The organic material (the wood) is transformed first in a raw substance and saturated with powder, the syngas; subsequently it is cooled and purified, up to be optimal to activate gas engines. The whole plant produces no emission but the drains of the engines, whose values fall within the prescribed limits of Law reported on the DL 152/06. Especially reduced is the value of fine dust emissions PM10, up to 20 times lower than that of a typical pellet boiler of equal thermal power.
The maximum size of available plant is of 200 kW; the organic material consumption, 35-37% humidity (the plant dries autonomously wood at 10- 12%), is about 1,500 tons per year for the 200 kW system. The modular design facilitates installation and maintenance, while an insurance guarantee eliminates the risk of malfunctions.
Subsidies on Ministerial Decree of 6th July 2012 and 23rd June 2016 DMiSE
The cogeneration plant described herein falls between the plants subsidized by the Ministerial Decree of 6 July 2012 and by the subsequent Decree of the Ministry of Development of 23 June 2016. The decrees determine the method of subsidizing the production of electricity from plants powered by renewable sources ; the expected subsidy has aduration of 20 years and currently has a basic subsiding tariff (Tb) of 246 €/ MWh (DMiSE of 23 June 2016). For plants that come into operation by 30 June 2017 shall be also provided for any awards (Pr), such as reducingemissions (30 € / MWh) high-efficiency cogeneration (10 € / MWh), use thermal energy for district heating (40 € / MWh) (DM July 6, 2012).
Internal consumption of electric energy
The subsidies are recognized on the net production of electricity led from the plant. The net production injected is the value between the net output of the plant and the self-consumption (set by the DM July 6, 2012 as a fixed value to 17%). The plant has an increasingly self-consumption in less than 17% and it is possible for this use in own and / or dispose of the portion of the electrical energy not subject to subsidy.
Process description Principle of operation of the pyrolysis reactor, Pat. 0001415899
The innovative part of the entire system is the pyrolysis reactor, which has enabled us to reactivate inactive and / or malfunctioning plants and can design the complete plant. The pyrogasification used is of the type commonly referred to as "down-draft". This type of pyrogasification consists of a closed tank in slight depression in which wood chips enter from above. Both the product gas (commonly referred to as syngas) that the ashes produced out from the bottom of the reactor.
The Cogeneration plant consists of:
Simplified two-stage pyrogasification producer capable of producing syngas in sufficient quantities to power an electric generator for about 200 kWe and 200 kW thermal systems;
Filtration system, cooling and cleaning of the produced gas;
Full engine electric generator, alternator, approximately 200 kW, in cogeneration with the motor-driven water return and waste gases with the production of hot water at 70/80° C;
Casing of electric generator, ensuring a sound proof standard of 65 decibels (optional 45 decibels);
MV/LV transformer into resin from 100 kVA; Control Panel of pyrogasification
control panel and parallel panel of the cogenerator made as per 0-16 regulations module and complete with tax counters;
Heat recovery units (primary air/air heat exchanger designed to power a drying plant); Storage and transport of biomass system with automatic loading of the reactor;
Biomass drying system of about thermal 30 w.
Simplified two-stage Pyrogasification producer
Wood biomass powered gasification reactor;
treatment capacity of about 100/125 kg/h (quantities are proportional to the power
plant and the biomass used);
fluidifier method: air;
Filtration system, including: blast chiller, Cyclone separator, Scrubber Venturi, final
exchanger with Drop-stop, cooling Chiller and everything else needed to obtain the syngas to be sent to the engine.
Electrical generator of cogeneration in soundproof casing of 200 kW total
The generator driven by Otto cycle engine suitable for operation with gases poor in output of 200 kW will be provided among the models produced by the major manufacturers of gas engines. The choice of the generator will be defined after the site survey, humidity and average composition of chips that will be used and, before signing the contract for the supply of the system.
the parallel switchboard will be installed and connected to the edge of the generators on site, tested and verified for all parallel operations, including:
operational command, control and signalling circuits of the electrical generator placed on one single board with the possibility of remote control;
circuit breaker and parallel;
interface protection for parallel grid;
Electrical cabinet will be given with 100 kVA transformer LV/MV, LV, BT delivery panel, MT panel offering protection and General device.
The cabinet will be made of metal and will be divided into "local user", local transformation.
Tax counters needed to count the energy produced in order to obtain comprehensive incentive tariffs.
Review and possible adjustment of the transformer cabinet
It is expected the adjustment and revision of the user's transformer cabinet both if you already possessed and to make it.
The plant fed with solid biomass is designed for continuous service 24 hours out of 24 hours; fully operational, taking into account any periods of downtime for various reasons, is guaranteed a run for at least 7,500 hours per year.
The power of plant it depends on both the moisture that the size of the chips. The relationship between relative humidity and plant power may vary according to decreasing moisture values, taking as a basis for calculation relative humidity at 20%. As for the power supply must use "chips" between 35 mm and 50 mm with a tolerance of +/-20% maximum humidity 35-37%.
Approximate size: 2,393 6,012 mm x mm