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Downdraft Linear Gasification Technology

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A Modular Downdraft Linear Fixed Bed Gasifier

Gasification

Our mobile gasification is second to none, The “No Tar”, Efficient, Producer Gas fires internal combustion engines, turbines and boilers. Designed to provide an alternative source of convenient energy for locations where the use of conventional fuel is economically difficult or environmentally undesirable.

General Equipment included will be:

  • Feedstock storage bin with “live” bottom
  • Feedstock delivery auger from storage to header bin on gasifier
  • Automatic Ash removal system
  • Gas cooling/filtering system and gas delivery compressor
  • Engine genset complete with engine management system

 

The main product gases; carbon monoxide and hydrogen, can be later piped away for use as fuel for internal combustion engines driving electricity generators or turbines, with the concomitant heat from the thermal converters and engines being used for heating, drying or chilling.

An important feature of the technology is the ability to divert the engine exhausts from the genset back to the thermal converter. This not only reduces CO2 but also serves to enhance the thermal conversion process.

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CONVERTING CARBONACEOUS FEEDSTOCK TO COMBINED HEAT AND POWER WITH THERMAL CONVERSION TECHNOLOGY.

Features

Environmentally FriendlyVersatileVersatility Of FeedstockProducer Gas Engine GeneratorAncillary ComponentsIgnitionDrying, Distillation and CarbonizationOxidationReductionSummary

250kw

A thermal converter can process solid wastes from sustainable carbon based feedstock to produce a clean, high octane gaseous fuel that can be safely used in a variety of applications.

The conversion takes place in a specially engineered air-tight reactor that has no emissions other than a residual ash that is periodically extracted from the base of the reactor. The ash is totally benign and can be used as agricultural or garden fertilizer.

“True thermal conversion” has a 30 year history of clean, environmentally friendly operation, and is an application favored for converting municipal solid waste, waste wood from sawmills and other carbonaceous material into combined heat and power.

The thermal converter is designed, engineered and built for continuous, 24 hour operation, but can easily be utilized in an “on demand” or peaking application as a result of the unique Automation and Management System.

Bioenergy Scheme Layout-1

The thermal conversion power plant is a “true” biomass renewable energy system. The entire system, from the fuel storage and handling to the producer gas outlet, is custom designed, fabricated and tested to meet exact fuel and energy specifications.
An important feature of thermal conversion is the fact that it is specifically designed to operate in boiler rooms, cogeneration spaces and machine rooms. It is safe and complies with all local, state and federal regulations, utilizing only UL certified components.
The most notable aspect of the versatility of a thermal converter is found in its fuel feedstock capabilities. The options are almost limitless!

biomass sources

Regardless of the proposed feedstock, the design team will work closely to determine the system that will best meet fuel handling and energy requirements.

generatorcontrolpanel

 

The power plant will be fully automated and equipped with all necessary gauges and controls. It will be coupled to a sensor array that will provide Remote monitoring and control capabilities from the control booth and will also have a cellular connection the internet

The Engine generator will be coupled to the gasifier, tested and installed with the gasifier in a weather proof container BEFORE Delivery!

Supply and install a Power Plant Automation and Management System. The system will provide continuous “real time” monitoring of all activities of the power plant while allowing fingertip control from “startup” to shutdown. The system will gather and store data from critical points of the power plant that will be available locally or remotely via a data transfer system.

All movement of the fuel feedstock will be monitored and controlled by an array of motion and contact sensors. The system can be manually overridden at any time from numerous control points in the delivery system.

The operation, shutdown, startup of all system components, including fans, motors, ignition, gas flow, valve positions, ambient air temperature and flow as well as system outputs can be monitored, controlled and managed in the central control booth, cellular connection or the Internet.

Ash removal is automatic and continuous during operation. However, the ash bin may be accessed for manual ash removal.

All data will be monitored in the control room by a data acquisition system and displayed continuously. Parametric read outs will be displayed, simultaneously, for all sensors.

The appropriate read outs will have, both, high and low limits programmed into the unit as will the data collection unit. When this limit is reached, a snap controller will activate an audible alarm, and the data acquisition unit will automatically activated a preprogrammed dial up that will notify the proper personnel in order to take the necessary corrective action.

All data that has been logged will be able to be retrieved locally and remotely for diagnostic evaluation.

Operator training will start during system setup, startup and the commissioning. Prospective operators are encouraged to participate in all phases of commissioning.

  1. Major Components and Services Provided.
  2. Power Plant comprising of Gasifier and Engine Generator modules.
  3. Two stage “dry” producer gas cleaning, cooling and polishing system.
  4. Fuel feedstock storage and feed delivery system.
  5. Automated ash removal system.
  6. Piping, valves, fittings, insulation, fans, motors, etc between Gasifier and Engine
  7. Power Plant Automation and Management System
  8. Control Booth and associated instrumentation
  9. Project Engineering and Project Supervision
  10. Commissioning.
  11. Operator training, manuals, CDs, operator’s packet of spare parts for power plant and management system.
  12. Monitoring and support systems
  13. Performance Guarantee and Warranty
  14. As built drawings

 

A significant point to consider, while discussing the versatility of a thermal converter, is the output of your system. The thermal converter can convert specified feedstock into a clean, high octane gas. The gas may be utilized to fuel engines, turbines, furnaces, boilers, or a combination of any of these.

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Beginning with a ‘start-up’ charge of charcoal and feedstock in the combustion zone, gasification proceeds as follows:
Along with a restricted flow of primary air drawn laterally into the bed, a flame is introduced to ignite the feedstock and within a minute, oxidization begins.

Heat radiating upward from the partial combustion zone drives moisture from the feedstock at a temperature of 100 C. and, as the charcoal beneath is consumed; the feedstock closer to the source of heat.
At this point, the temperature is between 250 and 450 C. The carbon and volatile substances, distilled from the feedstock, may ignite, raising the temperature even further. At 600 C. the charred feedstock ignites, rapidly boosting temperature.

A great deal of heat is produced in the system at this point; when the ambient air (oxygen) enters the combustion zone; contacts and reacts with incandescent feedstock to produce carbon monoxide, a “fuel gas” which diffuses back into the gasifier spaces between the feedstock pieces where it oxidizes and burns to form carbon dioxide, a “flue gas” .

As the carbon dioxide increases in the gasifier spaces, a counterbalancing decrease in the free oxygen occurs in the same spaces and concentrations of both these gases approach equilibrium.
The carbon monoxide produced in the initial feedstock/air oxygen reaction quickly falls to a low concentration at which it is held in dynamic stability.

Simultaneously, steam from the feedstock has joined with the ambient air (oxygen) also to react with the incandescent charcoal where it decomposes to carbon monoxide and hydrogen, which together also diffuse back into the gasifier spaces between the feedstock pieces where they, too, are oxidized and burn to form carbon dioxide and steam respectively. The process temperature during the above reaction is 800 C. plus.
At this point, the heat requirements of the process balance the heat created. The flame temperature is at its maximum; around 1,100 C. and the oxygen now almost exhausted.

(Gasifier Process Diagram)-1

At this oxygen starved stage in the process, the carbon dioxide and the steam in the gas spaces diffuse to, and react with, the hot feedstock in the “reduction zone” to produce carbon monoxide and hydrogen, the main fuel constituents of carbonaceous derived ‘Producer Gas’. These reactions consume both heat and feedstock.

As process temperature continues to decrease, the rates of these reactions also decrease, until, when the temperature falls to 700-800 C. and/or the feedstock supply is exhausted, the thermal conversion process stops.
The main product gases; carbon monoxide and hydrogen, can be later piped away for use as fuel for internal combustion engines driving electricity generators or turbines, with the concomitant heat from the thermal converters and engines being used for heating, drying or chilling. An important feature of this technology is the ability to divert the engine exhausts from the genset back to the thermal converter. This not only reduces CO2 but also serves to enhance the thermal conversion process.

Although some stages of the process occur sequentially, and others simultaneously, they are continuous and in equilibrium, while feedstock and limited “primary” ambient air (oxygen) are fed to the vessel to sustain the process.
Except for the fuel drying stage, the other thermal conversion processes occur within the reaction vessel.
Because of the high temperature, plus the oxidizing and reducing atmospheres which must be developed and sustained within it, the vessel incorporates special refractory materials, surface treatment and thermal insulating materials that are selectively placed to withstand the rigor of the main thermal conversion processes for a prolonged period.

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