Combined Heat & Power (CHP)

CHP Image

April 2017 marks the completion of our brand new Combined Heat & Power Plant (CHP) Plant at our Parley facility in Dorset.

The new plant is capable of burning 10,000 tonnes of oversized organic material which is taken from the established composting process on site.

The energy generated from the plant will be used to power the site, with any excess fed into the National Grid.

Our Process

Our shiny new CHP plant has a very detailed and intricate process. The plant certainly is a sight to behold, so we've tried to simplify the steps as best as possible to share the details with you all!

1. The process starts in the loading area where plates move back and forth (powered by hydraulic rams) to pull the wood waste into the stockpile at the back of the bay.

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2. From the stockpile at the back of the loading bay, the wood is fed through a gap onto a conveyor and up a conveyor belt.      

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3. At the top of the conveyor belt, the material drops into the feeder. Two cork screw mechanisms push the material forward from the feeder and into the burner.

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4. Within the burner, the material tumbles down the grate, burning as it goes. 

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5. The gasses released from the burning material, rise to the top of the burner and out through a controlled channel. At the same time, the ash from the material passes through the bottom of the burner and drops onto a conveyor, which moves it out. The first place this happens is from the grate, the second place this happens is from the filter.

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6. The before mentioned hot gasses travel through an expansion joint and into a turret. 

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7. From the turret, the gasses are pushed down through the heat exchanger. The gas is passed up and down three times to extract as much heat from the gas, into the oil.  At this stage, the oil travels off and undergoes a very separate process. We've highlighted this below as its just as fascinating...

Oil process.....

1. From the heat exchanger, a hot oil is generated which is then pumped through to the ORC (Organic Rankine Cycle) turbine.    

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2. At the ORC Turbine, the hot oil enters from the back of the system.

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3. At this stage, the heavy oil is mixed with a light oil. (this is because light oil vaporises easily) and the combined oils vaporise and turn into steam.

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4. The vapour then passes through a turbine and the low pressure causes a vacuum. The vapour is sucked through the turbine which causes the turbine to spin.    

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5. The turbine is connected to a generator and this creates electricity.

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6. Hot water is pumped out and either cooled in the plant or used again on site.       

 Back to the gasses.....                                                 

8. The hot gasses then come out of the heat exchanger into the floo gas filtration system. 

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9. The gas passes through 2 chambers within the filter. They then pass through a fan and are blown up the stack before leaving, clean into the atmosphere. The plant monitors the floo gasses continuously.

 

End Results

The CHP plant generates, clean, green, renewable energy which delivers electrical power to the site and National grid.

A thermal energy is also created which delivers hot, useful water to the Biomass process.                

Additional Info

CHP Fact 1

The rams in the loading bay move 1ft forward and back as they go, pulling the material into the feed. 

CHP Fact 2

If all 3 rams from the loading bay were pulling together at the same time, the bay would hold 95 tons per m2! The loading bay would explode under this weight, so all 3 rams are not working at the same time.   

CHP Fact 3

The burn is controlled to over 900 degrees for 2 seconds - this allows the gas to climb to the correct heights. Thats as hot as the brake discs on a rally car OR the surface temperature of the planet Venus!!!

CHP Fact 4

The heavy oil is at a temperature of 315 degrees at its hottest!

CHP Fact 5

Regular vegetable oil is used on the walking floor system to keep the feed lubricated. This is done so no mineral oil is present in the fuel or ash.

 

                              

Gallery

Facts & Data


The Organic Rankine Cycle (ORC) is named for its use of an organic, high molecular mass fluid with a liquid-vapor phase change, or boiling point, occurring at a lower temperature than the water-steam phase change.

The fluid allows Rankine cycle heat recovery from lower temperature sources such as biomass combustion, industrial waste heat, geothermal heat, solar ponds etc.

The low-temperature heat is converted into useful work that can itself be converted into electricity.

Memberships & Accreditations

  • ORG Logo
  • Soil Association Logo
  • WRA Logo
  • BSI Logo

If you would prefer to speak to one of our dedicated customer service team please call us 

01202 593601

(Opening hours: Mon to Fri: 8:30am - 5pm & Sat: 7am - 11:30am)

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