Biomethane Gas Quality Analysis for Grid Injection Using Gas Chromatographs
Meet Biomethane Grid Injection Standards with Reliable Compositional Analysis
Save Cost and Ensure Biomethane Interchangeability with Natural Gas
There are different technologies used for biogas cleaning and upgrading into biomethane/renewable natural gas (RNG). The aim of upgrading technologies is to achieve high methane purity and low methane losses with low energy consumption. The production technology and biogas feedstock affect the composition of biomethane. Biogas feedstock can consist of food waste, landfill gas, livestock waste, wastewater treatment and crop residues.
When biomethane is fed into the grid, the gas quality and energy quantity introduced must be determined and the accuracy of these values must be verified. A gas chromatograph (GC) is a reliable method for identifying the compositional analysis of biomethane and monitoring its quality, calorific value and Wobbe index. Emerson offers two gas chromatograph solutions to address biomethane analysis needs. These GCs are certified to industry and national metrology standards.
Click to continue reading Save Cost and Ensure Biomethane Interchangeability with Natural Gas
Product Solutions
Designed for optimum reliability and flexibility, the Rosemount 700XA Process GC provides extended gas composition analysis with remote operation capabilities in an explosion-proof, field-mountable design. This reduces the need for elaborate analyzer shelters or temperature control requirements. Whether it is heating value measurement, trace contaminant monitoring, or product quality and process control, the Rosemount 700XA offers the flexibility to combine measurements in a single, transmitter-style GC, reducing footprint and total cost of ownership.
- Industry's first transmitter-style gas chromatograph capable of combining the measurement of natural gas energy content, hydrogen sulfide, speciation of total sulfur compounds to trace levels, and hydrocarbon dew point (HCDP) calculations in a single-analyzer solution
- Explosion-proof and ATEX/IECEX safety rating enables field installation without enclosure even in Class 1, Division 1 areas
- No instrument air for purge or oven required, reducing power consumption over traditional air purged GC units
Input
Analog Intputs: Six self-powered isolated outputs (4–20 mA)
Digital inputs: Five inputs, user assignable, optically isolated, rated to 30V DC @ 0.5 A
Digital inputs: Five inputs, user assignable, optically isolated, rated to 30V DC @ 0.5 A
Output
Analog outputs: Six self-powered isolated outputs (4–20 mA)
Digital outputs: Five user-assignable outputs, Form C and electromechanically isolated, 24V DC
Digital outputs: Five user-assignable outputs, Form C and electromechanically isolated, 24V DC
Communication Protocol
Ethernet: Two ports – one RJ-45 and one four-wire – with 10/100 mbps
Serial: Three termination blocks, configurable as RS-232, RS-422 or RS-485 and one RS-232 D-sub (9-pin) Modbus/PC Connection
Serial: Three termination blocks, configurable as RS-232, RS-422 or RS-485 and one RS-232 D-sub (9-pin) Modbus/PC Connection
Rosemount 770XA Natural Gas Chromatographs provide the most accurate analysis of natural gas available in a field mounted gas chromatograph (GC). The 700XA features a design that increases analytical capability, maximizes ease of use, and widens the range of analysis options in a GC with an ambient temperature rating of -20 °C to 60 °C/ -4 °F to 140 °F. These enhanced features make the 700XA ideal for natural gas custody transfer and applications requiring advanced analysis such as C9+ (with hydrocarbon dew point and cricondentherm calculations) and C6+ with hydrogen sulfide (H2S).
- Best C6+ heating value/BTU repeatability available
- ± / -0.01 % (± / -0.1 BTU/1000 BTU) in temperature controlled environment
- ± / 0.02% (± / -0.2 BTU/1000 BTU) in uncontrolled environment (-20° to 60 °C/-4° to 140 °F) with a three minute cycle time
Input
Analog inputs: Two standard isolated inputs filtered with transient protection, 4–20 mA (user scalable and assignable)
Digital inputs: Five inputs, user assignable, optically isolated, rated to 30V DC @ 0.5 A
Digital inputs: Five inputs, user assignable, optically isolated, rated to 30V DC @ 0.5 A
Output
Analog outputs: Six self-powered isolated outputs (4–20 mA)
Digital outputs: Five user-assignable outputs, Form C and electromechanically isolated, 24V DC
Digital outputs: Five user-assignable outputs, Form C and electromechanically isolated, 24V DC
Ports
Serial Communication Ports: Three termination blocks, configurable as RS-232, RS-422 or RS-485 and one RS-232 D-sub (9-pin) Modbus/PC Connection
