Model DCR Series - Deep Chilling Removal Systems
From Biogas Treatment
Reduced - Engineering cost, Installation cost. Compact design - Less Land & piping requirement. Speedier project delivery. Lower operating cost. Energy savings.
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Gas Cleaning Processes
Filtration: Separates particulates
Advantages: A simple & inexpensive process
Cooling: Condenses moisture and some contaminants; and dissolves contaminants; most siloxanes condense at -9 0F (-230C).
Advantages: Minimal waste, less maintenance - lower cost
Water spray/wash: Dissolves & removes H2S & VOC
Advantages: A simple & inexpensive process
Adsorption: Removes contaminants smaller than its pores sizes e.g. H2S, VOC and Siloxanes
Advantages:
- Simple process
- Lower capital cost
- Removes a broad range of contaminants
Disadvantages:
- High media procurement & disposal costs
- Liability- Creates potentially hazardous waste
- High maintenance
- Causes shut down/ down time during change
Deep Chilling Removal System
The DCR- Deep Chilling Removal system shall provide clean & dry ………SCFM/NM3/H of Bio/Digester/Land-fill gas at PSIG/BARG. The system shall remove 95 % or more of the contaminants, including moisture and SILOXANES, from the fuel gas, without using a carbon media. It shall chill and dry the fuel gas to -10 0F (-230 C) temperatures to condense and remove moisture, SILOXANES and other contaminants. The system shall be factory integrated & include –
- Class 1, Division 1/2 and Group D Electrical Control Panel & Wiring
- Fusible Disconnect or Circuit Breaker
- Control Panel: Separate for installation in a safe area, or, NEMA4X/7, installed on the skid
- Voltage: 460-3-60 or as required
- AB / GE PLC to control Fuel Gas and Refrigerant, temperatures and pressures at critical points
- Motor Starters/ Contactors: separate for installation in a safe area, or, installed on the skid
- ROSEMOUNT Pressure & Temperature Transmitters
- Safety features
- High Refrigerant pressure / temperature warning & shut down
- High Fuel Gas pressure / temperature warning & shut down
- Circuit Breakers/Fuses
- PRV
- Ethernet connector for remote monitoring & control
- A/B Touch screen (HMI) indicates -
- Power On / Off
- Fuel Gas Temperature and Pressure at all critical points
- Refrigerant Temperature and Pressure at all critical points
- Blower/Compressor status
- Refrigeration system status
- Cause of system/component shut down
- Control settings/adjustment
- Liquid level in all separators & filters
- Drain valve status
- Fuel Gas flow (SCFM)
- Gas compression package (blower / compressor) complete with -
- Fuel Gas flow & pressure control
- Capacity control: 25 % to 100 %
- 316 SS Inlet Filter-Scrubber & drain valve
- High liquid level alarm & shut down
- Back pressure regulating valve
- 316 SS After cooler, moisture Separator & drain
- TEFC Motor, HP--
- Motor Controls & Overload protection
- VFD, NEMA1, separate for installation in a safe area, or, NEMA4, installed on the skid
- Gas flow thru 316SS (except blower/compressor)
- 316 SS Gas to gas heat exchanger to pre-cool incoming fuel gas; and, to re-heat out going fuel gas to within 30 °F of the inlet gas temperature (Economizer # 1)
- 316SS Moisture evaporator - Cools incoming gas & saves energy (Economizer # 2)
- 316 SS Gas to refrigerant heat exchanger, cools incoming fuel gas to 35 to 40 0F (Stage 1 refrigeration)
- Duplex, alternating gas-refrigerant heat exchangers to chill gas to -10 0F (-230 C); one heat exchanger cools gas while the other is de-frosted to remove siloxanes and other contaminants, and, provide continuous flow of clean and dry gas (Stage 2 refrigeration)
- A set of PLC actuated valves to direct fuel gas flow to one of the two alternating heat exchangers
- A 0.01 micron “cold point” coalescing filter for maximum removal of contaminants
- A set of PLC actuated refrigerant valves to direct cold refrigerant to one heat exchanger to cool gas; and, warm refrigerant to the other heat exchanger to de-frost it
- Environment friendly refrigerant, R404a or R134a or approved equal
- For maximum efficiency, system shall cool gas in multiple steps; and, use condenser heat for de-frosting
- System shall be 'air cooled with fan cycling control' / 'Water cooled with water flow control'
- Equipment shall include multiple hot gas by pass valves to control gas temperature
- Equipment shall include refrigerant sight glass & moisture indicators
- ADSORBER & FINAL FILTERS: The system shall include Number of vessels...; Number of Final Filters; Vessel size (D x H)...; Vessel material...; Media quantity...
- The system shall provide following signals for remote monitoring & control.........
- System shall include an automatic drain at each separation point
- The system shall be blast cleaned, primed and epoxy painted
- Single point Fuel Gas inlet, outlet & drain connections, within 6” of the edge of the equipment
- Single point electrical connection, within 6' of the edge of the equipment
- The Fuel Gas processing system shall be PIONEER Model DCR---
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