Introduction

The EcoFlowTM V20 H mobile filter unit (MFU) is specially developed and built for the treatment of air and gases. The filtration unit is a combined transport vessel and adsorption system delivered, prefilled with selected adsorbent media, to ensure cost effective purification results. The mobile filter unit EcoFlowTM V20 H is supplied with the necessary piping and standard quick-release couplings for easy and rapid installation. The EcoFlowTM V20 H can be used as a single filter; in parallel; or in series depending on the specific nature of the customer’s application. The mobile filter unit EcoFlowTM V20 H is taken off-line once the adsorbent is spent, or the treatment objective is reached, and the entire unit is removed from site. If further treatment is required, it is replaced with another filter. This eliminates the need for onsite spent carbon handling and minimises the transport cost.This Technical Information Sheet gives an overview of the operating instructions for the EcoFlowTM V20 H mobile filter unit (MFU). These Instructions should be used in combination with the Technical Data Sheet and the typical process flow diagram.

Installation and preparation

The EcoFlowTM V20 H must be installed on a flat horizontal surface designed to support the maximum operating weight of the EcoFlowTM V20 H. The EcoFlowTM V20 H shall be earthed via the earthing boss located on the EcoFlowTM V20 H before connecting the unit to the process. The EcoFlowTM V20 H is used in up-flow mode and the user should ensure tightened connections to the gas inlet and outlet respectively. Connect the inertisation line prior to start-up.

 

Inertisation

The EcoFlowTM V20 H should be purged with an inert gas (Nitrogen, carbon dioxide…) before the biogas is introduced. The EcoFlowTM V20 H should be flushed with a minimum flow of 600 m3/h during 10 minutes. Be aware that initial biogas leaving the adsorber after the inertisation process will likely have a lower methane concentration that could offset the engines or turbines.

Start-up and operation

The EcoFlowTM V20 H is connected with DN250 flexible hoses to the gas inlet and outlet. The gas is fed to the EcoFlowTM V20 H with the blower of the customers site. The blower must be started and put into operation before putting the adsorber into operation. When this is done we can open slowly the gas inlet valve V1 and outlet valve V2. The flow rate and discharged pressure are to be controlled and manually set at the required settings. The operator should monitor, on a regular basis, the pressure drop over the system and take samples of the raw and treated biogas for analyses during the entire operation. The drain (V4) valve should be checked on a regular basis to drain down any condensed liquids.

Routine follow up is to be performed by the user to ensure continuous and effective operation of the EcoFlowTM V20 H. This follow up includes checking and tightening flanges and connections to eliminate leakages

Shut down

For short operational shut down the EcoFlowTM V20 H filter remains connected to the process. It is recommended to drain any condensate formed on a regular basis.

For longer shutdown periods, isolate the EcoFlowTM V20 H by closing the process valves. It is recommended to drain any condensate formed on a regular basis.

Preparation for return

When the carbon is saturated or the treatment objective is reached the following steps are taken:

1. Stop the biogas feed

2. Preparation of the spent carbon: Remove the biogas in the filter with an appropriate inert gas.

3. Close all the valves

4. Disconnect the EcoFlowTM V20 H

5. Drain the EcoFlowTM V20 H of condensate before transport

6. Ensure that no parts are missing and that bolting is complete and correctly tightened

7. Notify Jacobi Services that the EcoFlowTM V20 H is ready to ship.

Exotherms

In the unlikely event a hot spot or bed fire is detected, the EcoFlowTM V20 H is taken off line and inertised with an inert gas. In case of excess heat generation, water can be used to quench the carbon bed. In this case slowly fill the adsorber up flow with water at a flowrate of maximum 4 m3/h. The low flowrate or velocity is necessary to prevent high steam emission and possible carbon entrainment.

Trouble shooting

1. High pressure drop.

• Build-up of dust in the carbon bed or high feed fan pressure.

• Dust in the inlet gas.

• Test for dust content in inlet gas.

• Check if the filter can be cleaned. If necessary exchange the mobile filter.

• If the problem occurs regularly then install a pre filter.

2. High feed fan pressure.

• Throttle feed fan (close inlet damper)

3. Leaking Flange

• Leaking could develop during transport. In this case the flange should be tightened.

4. Premature breakthrough

• Influent is different than expected.

• Influent concentration is higher than expected.

• Co adsorption of other molecules.

• Relative humidity is not correct.

• Oxygen concentration is lower than expected.

• Confirm by checking influent samples before changing the unit.

Sample pot

Activated Carbon is used in a wide range of vapour phase applications. Adsorbents generally have a limited life time and need to be managed once they are saturated or the treatment objective is reached. Jacobi Services offers several disposal or recycling services in different processing facilities. A sample pot can be installed in parallel with the mobile filter in order to define the recycling method or disposal route. The sample is send to Jacobi services for analyses in order to define the most cost effective recycling or disposal route.

Caution

Do not exceed the operating conditions mentioned in the EcoFlowTM V20 H Technical Data Sheet. If process conditions may develop outside the standard parameters of the EcoFlowTM V20 H, then the necessary safety devices must be installed to avoid the consequences of operating under such conditions.

Check and ensure that the composition of the gas being treated is compatible with the materials of construction of the EcoFlowTM V20 H. Optimum use of the EcoFlowTM V20 H is achieved if changes of the system occur slowly and the relative humidity is kept below the dew point. Rapid changes to the system can cause upsets to the adsorber, which could adversely affect the operation. Valves should be adjusted slowly to prevent shocks. The EcoFlowTM V20 H is designed to be moved with a special trailer. Check with Jacobi Services prior to moving the unit.

“Wet activated carbon depletes oxygen from air and, therefore, dangerously low levels of oxygen may be encountered. Whenever workers enter a vessel containing activated carbon, the oxygen content should be determined and work procedures for potentially low oxygen content areas should be followed.

In exceptional conditions a hot spot can be produced by heat of adsorption and exothermic reaction of the activated carbon bed with certain substances. The user should undertake a risk assessment and implement the necessary precautions to comply with the local safety regulations for the unlikely event of a hotspot or bed fire, if deemed necessary.

Checklist:

To ensure effective operation of the EcoFlowTM V20 H it is important that following requirements are met prior to the delivery of the first unit:

  • ‰ Access – suitable access for a truck and trailer unit weighing up to 44 MT. The minimum turning radius is 13m.
  • ‰ Clearance height – A minimum clearance height of 9 m.
  • ‰ Drain – Is there a drain available, capable to evacuate condensate if necessary? This condensed water can contain fine activated carbon particles.
  • ‰ Inertisation – Inertisation connection is provided.
  • ‰ Interconnection – DN 250 flanged flexible hose or pipe of suitable length to connect the EcoFlowTM V20 H.
  • ‰ Placement – The EcoFlowTM V20 H must be placed on a flat surface capable of supporting the maximum operating weight. Sufficient access should be foreseen to make an exchange possible. For example, when the customer uses 2 units on site then there should be sufficient space to place a third unit during the exchange.
  • ‰Process compatibility – Check materials of construction, temperature and operating ranges (maximum and minimum).
  • ‰Reactivation of Spent Carbon – Is there already an agreed plan of what to do with the spent media? Can we install a sample pot?
  • ‰Site personnel – Should be available during delivery and collection of the EcoFlowTM V20 H.
  • ‰Water supply – Water supply of maximum 4m3/h for the unlikely event of an exotherm developing and water quench being necessary