CO2 Self Generating Plants Combustion Based Unit Cbu

UNION ENGINEERING CO₂ Self-generating Plants - Combustion Based Unit - CBU

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CO2 Self Generating Plants Combustion Based Unit Cbu

PRODUCT INFORMATION

Pentair Union Engineering's CO₂ Self-generating Plants (CBU) are based on the combustion of fuels such as diesel oil, heavy fuel oil, kerosene, natural gas, LPG, or LNG. Through combustion, scrubbing, absorption, stripping, adsorption, and separation technology, the CO₂ Generating Plants meet the strictest CO₂ quality requirements regardless of the fuel type.

LIFE LONG PERFORMANCE

Combustion-based Plants are designed to enable decentralized production of CO₂ where the fuel is used for driving the process as well as generating to CO₂ needed.

Generating Plants are based on the absorption of CO₂ from the produced flue gas into a monoethanolamine (MEA) based solution, which is heated by the fired reboiler to release the CO₂ gas again.

To achieve the best combination of performance and equipment longevity, a 9 % MEA/water solution is used. Under this condition, the optimal balance between CO₂ load and avoidance of the corrosive effects of MEA is met.

Result-driven technology – NOxFlash and PUR-D
All our Generating Plants are based on our amine technology, including NOxFlash and PUR-D.

The NOxFlash technology is the result of innovation and research and has been proven in our installations since 2006. The NOxFlash technology:

Replaces the traditional use of scrubbing with PPM (potassium permanganate) solution thus reducing cost and environmental impact.
Acts as proven abatement of benzene (aromatic hydrocarbons) in the final product.

The PUR-D technology is the final purification step, consisting of a distillation column, which enables separation/blow-off of non-condensable gasses, reducing the O₂ content in the final product to max. 5 ppm (v/v) and obtaining a CO₂ purity of min. 99.999% (v/v).

Simple and trouble-free operation

The electrical system of our Generating plants assures:

The latest PLC technology for operation and monitoring
Automatic start sequence and fully automatic operation
Reduced installation and commissioning time on site

All plants are designed for high efficiency and reliability through components selected for 24/7 operation.

FUNCTIONAL DESCRIPTION: The plant is based on the combustion of fuel in an MEA heater equipped with a burner. After the combustion, the flue gas will have a CO₂ content of 10-14% v/v and will exit the MEA heater at a temperature of approximately 250 °C.

The flue gas is directed to a flue gas scrubber, in which the gas is cooled and water condensed. Any SO₂ present in the flue gas will be removed by means of a chemical reaction with sodium carbonate (soda ash). The soda ash is automatically added to the scrubbing water through pH control.

After cooling and scrubbing, the gas is led via an exhauster through an absorber, in which the gas flows counter-current to the MEA solution flow. By chemical reaction, the MEA solution absorbs the CO₂ from the flue gas. The MEA solution containing the absorbed CO₂ (referred to as rich MEA solution) is first pressurized and heated in a heat exchanger and then led to the NOxFlash column. Here most of the contaminants like O₂, N₂ and NO are removed from the rich MEA solution by flashing to the absorber pressure.

A stream of CO₂ and steam is added to the bottom of the NOxFlash column for further reduction of the contaminants in the MEA solution. This optimizes the process yield to the best possible CO₂ product without any use of expensive chemicals (Pentair Union Engineering pending).

Then the rich MEA solution is pumped to a stripper, where the CO₂ is released from the MEA solution utilizing the combustion heat generated in the MEA heater. The CO₂-depleted MEA solution (referred to as lean MEA solution) is recycled to the absorber. After exiting the top of the stripper, the CO₂-rich gas is cooled in a gas cooler and washed in an after-scrubber for removal of potential MEA carry-over. The gas is then compressed in two stages to approx. 15-18 bar(g) by the CO₂ compressor.

Before liquefaction, the gas is dried to a dew point of below -60 °C (10 ppm v/v H₂O) in the dehydrator. Regeneration is done automatically by electrical heating and the use of dry purge gas from the CO₂ condenser. Traces (if any) of acetaldehyde are also removed in the dehydrator. The CO₂ gas then passes through an activated carbon filter for the removal of any odor substances.

To remove the last non-condensable gases, the CO₂ gas first passes a reboiler in the purification system (type PUR-D). It is then condensed at a temperature of approx. -27 °C/-21 °C in a CO₂ condenser, where the non-condensed gases are purged off. Finally, the liquefied CO₂ is led through the distillation column to an insulated storage tank.

A refrigeration unit, controlled by the CO₂ pressure in the CO₂ condenser, supplies the matching refrigeration capacity. The liquid CO₂ is stored under a pressure of approx. 15-18 bar(g) and a corresponding temperature of approx. -27 °C/-21 °C. During a non-CO₂ production period, the refrigeration unit can operate independently of the rest of the CO₂ plant to maintain the correct CO₂ storage tank temperature/pressure.

The CO₂ produced has a purity higher than 99.999% (v/v) and fulfils quality standards as a food/beverage ingredient as specified by International Society of Beverage Technologists (ISBT) and European Industrial Gases Association (EIGA).

FIELDS OF APPLICATION: CO₂ Self-generating Plant Standard Sizes (measured as liquid food-grade CO₂ produced):

145 kg/h

285 kg/h

500 kg/h

1000 kg/h

1500 kg/h

2000 kg/h.

Other sizes are available on request.

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