94 results about "Natural-gas processing" patented technology

The invention relates to the technical field of natural gas treatment, and particularly discloses a turbine and motor double-drive magnetic levitation natural gas expansion recompression unit, system and method, and the turbine and motor double-drive magnetic levitation natural gas expansion recompression unit comprises a natural gas expansion machine, a high-speed synchronous motor and a natural gas compressor which are coaxially and rigidly connected; the magnetic suspension supporting system comprises an expansion side magnetic suspension bearing arranged at the output end of the natural gas expansion machine and a compression side magnetic suspension bearing arranged at the input end of the compressor, and is used for realizing non-contact suspension and torque transmission of the rotor; the electric control unit comprises an electric appliance cabinet and a pressure sensor, a converter and a main controller are arranged in the electric appliance cabinet, the converter is connected with a power grid and the high-speed synchronous motor, and the main controller dynamically adjusts the operation mode and power of the high-speed synchronous motor by taking the outlet pressure of the natural gas compressor as a control variable. The natural gas compressor is driven by the natural gas expansion machine and the highly synchronous motor, the unit with the reverse power generation function is adopted, the operation flexibility of the unit is improved, and the comprehensive utilization rate of energy is remarkably increased.

The invention discloses non-contact natural gas dehydration heating equipment, and relates to the technical field of natural gas processing. The first spiral heating pipe and the second spiral heating pipe which are spirally and crossly arranged are arranged in the isolation heating barrel, so that sufficient heat exchange is realized in the natural gas conveying process. Natural gas and high-temperature water are heated in an isolated mode, water mist carried in the natural gas can be effectively evaporated, and the water-vapor separation efficiency is improved. Compared with the traditional single-stage heat exchange pipeline design, the staggered spiral pipe increases the heating area and the heat transfer path, so that fine water mist particles in natural gas can be completely gasified, and a good premise is provided for subsequent condensation separation; and the condensation separation sheet adopts a rotary structure, and the surface is provided with a groove, so that the condensation area and the water drop adhesion capability are obviously increased. Meanwhile, centrifugal force is generated in the rotating process of the separating pieces, condensate water can be rapidly thrown away from the surface, enters the collecting tank and is guided to the water storage pond, and water drops are prevented from being mixed into natural gas again.

A system for processing a natural gas stream includes a flow-through turboexpander generator, a throttle valve, a knockout separator, and an absorption separator. The flow-through turboexpander generator is configured to receive a first portion of the natural gas stream and generate electrical power in response to expansion of the first portion of the natural gas stream. The throttle valve is configured to reduce a pressure of a second portion of the natural gas stream. The knockout separator is configured to receive the first portion of the natural gas stream from the flow-through turboexpander generator and configured to separate phases of the first portion of the natural gas stream to produce at least a gaseous phase and an aqueous phase. The absorption separator is configured to receive the gaseous phase from the separator vessel and separate water from the gaseous phase to produce a dehydrated natural gas stream.

The invention relates to the technical field of material science and chemical corrosion prevention, in particular to a production method of a high-pressure air cooling corrosion inhibitor. The bio-based corrosion inhibition carrier, the magnetic targeting intelligent nanoreactor and the dual-response polymer are cooperatively constructed, and a rare earth organic framework self-repairing system and a phase change induced self-assembly technology are combined, so that long-acting protection of the corrosion inhibitor in a high-temperature and high-humidity environment is realized. The corrosion inhibitor is endowed with excellent environmental adaptability through the combination of a bio-based material and a nano packaging technology. Due to the introduction of a rare earth, siloxane complex and zeolite oriented assembly system, the protective film has a self-repairing function. The near-critical self-assembly process of the functionalized ionic liquid significantly improves the pH response release efficiency of the corrosion inhibition component. The corrosion inhibitor breaks through the performance limitation of a traditional corrosion inhibitor under complex working conditions, and is suitable for the key industrial fields of petrochemical engineering, ocean engineering, natural gas treatment and the like.

The application belongs to the technical field of fine filter of natural gas treatment methanol recovery device, and particularly discloses a filter core extractor and method for methanol recovery device. The filter core extractor comprises a lever, a fixing hole is formed in the side wall of one end of the lever, a plurality of transposition holes are formed in the side wall of the middle part of the lever, a fixing structure is arranged at the fixing hole and used for fixing with the cylinder wall of the methanol recovery device, and a taking-out structure is arranged at the transposition hole. The taking-out structure comprises a buckle taking-out assembly, a cavity is formed in the middle part of the buckle taking-out assembly, a third through hole is formed below the cavity, a buckle taking-out ring is fixedly arranged in the third through hole, and the buckle taking-out ring is a circular sheet with a groove formed along the radial direction. The filter core screw cap is clamped by the cavity, the filter core screw rod is clamped by the groove in the buckle taking-out ring, so that the filter core is fixed, the fixing structure plays the role of fulcrum, the filter core is lifted and replaced by the lever, the filter core is not bumped during use, and the integrity of the filter core is ensured.

Example gas recovery systems include a source gas conditioning assembly configured to condition and compress the inlet source gas to provide a conditioned source gas, a first membrane assembly configured to separate the conditioned source gas into a hydrocarbon enriched stream and a recovery stream, a second membrane assembly fluidly coupled to the hydrocarbon enriched stream, and configured to separate the hydrocarbon enriched stream into a hydrocarbon product stream and a recycle stream, a carbon dioxide (CO2) plant assembly fluidly coupled to the recovery stream configured to provide a carbon dioxide product stream and an enriched recycle stream, a standalone membrane assembly configured to separate the enriched recycle stream into a hydrocarbon enriched recycle stream and an effluent stream, and wherein the source gas conditioning assembly is fluidly coupled to the recycle stream and the hydrocarbon enriched recycle stream.

The invention belongs to the technical field of natural gas treatment, and discloses a process and a system for recovering ethane and other light hydrocarbon components from oilfield associated gas. A washing tower is arranged before dehydration, heavy hydrocarbon components in the oilfield associated gas are removed, the influence of the heavy hydrocarbon components on a molecular sieve dehydration device is reduced, the service life of a molecular sieve is prolonged, and a liquid phase separated by a low-temperature separator is cooled by a cold box to be cooled and throttled to enter the top of a demethanizing tower; and the low-temperature freezing blockage influence of the carbon dioxide component on the demethanizer can be well reduced.

The application discloses a differential pressure power generation system of a natural gas treatment station and belongs to the technical field of natural gas transmission. The system comprises an inlet separation metering subsystem, a differential pressure power generation subsystem and a high-pressure venting subsystem, all of which are connected with a control system. The inlet separation metering subsystem comprises a separation unit and a metering unit. The separation unit comprises a first horizontal separator connected with a gas inlet port of an upstream single well or a gas gathering station. The liquid phase outlet of the first horizontal separator is connected with a port of a condensate oil stabilizing device. The metering unit comprises a vertical separator connected with the gas inlet port of the upstream single well or the gas gathering station. The gas phase outlet of the vertical separator is connected with the inlet of the first horizontal separator. Through the control of the control system and the interactive cooperation of the multiple subsystems, clean power can be generated by effectively utilizing pressure energy while ensuring the continuous and safe transmission of natural gas and meeting the process requirements of the treatment station.

A system for processing liquified natural gas can include: a natural gas feed; a cold box; one or more natural gas cooling components; and a storage tank configured to store a refrigerant, wherein the one or more natural gas cooling components and the storage tank are located within the cold box. The cold box can be a methane cold box and the refrigerant can be propane, ethane, or ethylene. The system can also include a propane refrigerant cycle and / or an ethylene refrigerant cycle. Refrigerant stored in the methane cold box can be used to replenish refrigerant lost in the propane / ethylene cycles. The cold box can be an ethylene cold box of the ethylene refrigerant cycle. Propane can be stored in the ethylene cold box. A second storage tank can be located within a methane cold box and store ethane or ethylene.

The invention discloses an MDEA compound system for decarburization and a synergistic interaction method, and relates to the technical field of natural gas treatment and gas purification, in the MDEA compound system, N-methyldiethanolamine as a main agent accounts for 20-30% of the total mass of the compound system, Ce-MCM-41 accounts for 5-10% of the total mass of the compound system, an ionic liquid accounts for 5-10% of the total mass of the compound system, and the balance is water. The activating agent accounts for 1-3% of the total mass of the compound system, and the balance is water. When the MDEA compound system is applied to a process for removing carbon dioxide in natural gas, solid impurities, part of degradation products and generated anionic salt in an amine-rich solution and a barren solution are effectively removed through a three-stage filtering system and an ion exchange resin tower which are arranged in a process system. Therefore, through the cooperative scheme of the MDEA compound system and the decarburization process, the removal rate of carbon dioxide in the feed gas can be increased, the loss of N-methyldiethanolamine in the MDEA compound system in cyclic utilization can be reduced, and meanwhile, the blockage of equipment and pipelines can be prevented and controlled, so that the purposes of reducing the cost and improving the efficiency are achieved.

The utility model discloses electric dehydration equipment for crude oil containing natural gas, which relates to the technical field of petroleum and natural gas processing and comprises a tank body, a transformer, an internal part and a pipeline, the interior of the tank body is sequentially divided into a gas-liquid separation area, an oil-water preliminary separation area, an electric removal area and an oil storage area; a crude oil inlet is formed in the side wall, located in the gas-liquid separation area, of the tank body, and the inlet distributor is located at the crude oil inlet in the tank body; the steady flow plate and the oil-water separation filler are arranged at the downstream of the gas-liquid separation area; the electrode plate is positioned in the electric stripping area and is connected with the transformer; the separation weir plate is used for separating the electric separation area from the oil storage area, and the oil storage area is provided with an oil purification self-vortex-prevention device and an oil phase opening; the demister is arranged at a gas phase opening in the top of the tank body; through the integrated design, the crude oil treatment process is simplified, the number of equipment and the occupied area are reduced, the investment and the operation and maintenance cost are reduced, and the treatment efficiency and the safety are improved.

The present application relates to the technical field of natural gas processing equipment, and specifically to a wellhead continuous natural gas sand removal and separation equipment and method, comprising a separation cylinder, the outer wall of which is connected to a wellhead gas transmission pipe, and the outer wall of which is fixedly connected to an outlet pipe. In the present invention, an outlet fan sucks out the treated natural gas through the outlet pipe. When the natural gas with sand particles enters the interior of a conical separation box, the guide spiral rotating plate guides the natural gas, causing the airflow to change from linear motion to circular motion. Most of the rotating airflow moves along the wall of the device in a spiral downward and flows toward the bottom of the cone. The dust-laden natural gas generates centrifugal force during the rotation process, throwing particles with a density greater than that of the natural gas onto the inner wall of the conical separation box. Once the sand particles come into contact with the inner wall of the conical separation box, they lose their inertial force and fall along the wall by the gravity of the sand particles themselves. The fallen sand particles are discharged into the top of the filter plate through the sand discharge pipe.

The invention discloses key equipment for capacity expansion of an old platform of an offshore high-water-content oil field. Comprising a platform original first-stage three-phase separator, a platform original second-stage three-phase separator, a degassing desander, a platform natural gas treatment and recovery system, a platform oil-containing solid recovery system, a tubular vortex pre-dehydrator, a tubular vortex degreaser, a platform production water treatment and reinjection system, an exhaust pipe and a valve assembly. Degassing is completed through weak rotational flow and weight deposition formed by a tangential inlet, sand removal is completed through combination of secondary rotational flow formed by a flow stabilizing cylinder support and a flow adjusting component and an inclined plate, and it is guaranteed that follow-up tubular vortex water pre-diversion and a tubular degreaser work in the optimal working environment.

An offshore industrial complex for raw gas extraction, treatment, and processing includes a gravity-based structure (GBS) with a topside on it, including a drilling facility with drilling rig, flare unit, process equipment for raw gas treatment and processing as modules, and living quarters. The GBS has central and protruding parts. The central part is a rectangular prism with a top slab, on which the process equipment is installed. The protruding part stretches along the central part sides and has vertical external walls. The central and protruding parts share a base slab, the protruding part being lower in height than the central part. The central part has longitudinal and transverse walls that form compartments, including ballast compartments and compartments accommodating storage tanks for respective processed products. The protruding part has internal walls that are perpendicular to its external walls and form ballast compartments.

The invention discloses a natural gas processing system capable of circularly purifying, and belongs to the technical field of natural gas processing, the natural gas processing system comprises a natural gas purification system and a natural gas liquefaction system, in the natural gas purification system, an MDEA deacidification unit performs acid gas removal on raw material natural gas, and a molecular sieve dehydration unit is provided with two drying towers; a molecular sieve bed and a pre-dehydration unit at the bottom are arranged in the tower, the pre-dehydration unit realizes preliminary dehydration and can also remove residual acid gas, and a recycle gas compressor can pressurize substandard natural gas or natural gas needing load adjustment and then return the pressurized natural gas to an MDEA deacidification unit for cyclic purification and a natural gas liquefaction system. The liquefaction cold box is used for liquefying the purified natural gas, the refrigerant compression unit is used for providing a cold source for liquefaction and can form circulation with the molecular sieve dehydration unit to assist driving replacement, and the system and a DCS (Distributed Control System) are automatically controlled through a program control valve, so that continuous operation is guaranteed, and the energy utilization efficiency, the purification effect and the working condition adaptability are improved.

The invention relates to the technical field of natural gas processing devices, in particular to an intelligent control system and method for a molecular sieve dehydration process, the system comprises a data acquisition and data cleaning module, a calculation module and a process control module, the data acquisition and data cleaning module is connected with the calculation module, and the calculation module is connected with the process control module; the calculation module comprises an adsorption conversion time calculation unit, a hot blowing ending judgment unit and a cold blowing ending judgment unit, the adsorption conversion time calculation unit judges the conversion time of the molecular sieve, and the hot blowing ending judgment unit judges the ending opportunity of the hot blowing process of the molecular sieve dehydration process; and the cold blowing ending judgment unit judges the ending time of the cold blowing process of the molecular sieve dehydration flow. According to the intelligent control system and method for the molecular sieve dehydration process, the stability of system operation is improved, precise control over the molecular sieve is achieved, the adsorption capacity of the molecular sieve is fully exerted, and energy waste is avoided.

This invention relates to the field of natural gas processing equipment technology, and particularly to a method for diagnosing degradation faults in desulfurization towers during natural gas purification processes. The method comprises nine steps: multi-source synchronous acquisition of desulfurization tower operating information; time-consistency processing of operating information; adaptive fuzzy operating condition identification; equipment functional state construction oriented towards process functional semantics; function-process decoupling based on process constraints; establishment and deviation measurement of functional residual benchmarks; high-time-sensitivity determination oriented towards slow degradation evolution; degradation fault type diagnosis based on functional change structures; and online reconstruction and closed-loop self-calibration of functional benchmarks. This invention provides a desulfurization tower degradation fault diagnosis method capable of establishing stable functional benchmarks under continuously changing multi-condition conditions and effectively decoupling between equipment functional changes and process disturbances in strongly coupled environments. This improves the stability and accuracy of degradation diagnosis under long-term operating conditions, thereby enhancing the safety and reliability of natural gas processing systems.

The invention belongs to the technical field of natural gas treatment, and discloses a process method and system for removing methanol in liquefied gas by circulating water, the process method comprises the following steps: cooling alcohol-containing liquefied gas, reacting with water, and carrying out mass transfer and adsorption to separate methanol from liquefied gas to obtain methanol water and liquefied gas containing trace water; after removing trace water carried by the liquefied gas, storing the liquefied gas; collecting methanol-containing water, carrying out heat exchange on the methanol-containing water, filtering, and rectifying to obtain methanol and methanol-removed water; after the non-condensable gas in the methanol is separated, returning one part of the methanol as reflux liquid to the rectification process, and directly storing the other part of the methanol; one part of the methanol-removed water is used for providing a heat source in the rectification process, and the other part of the methanol-removed water is used for participating in the water reaction process after being cooled and filtered. The methanol in the liquefied gas is effectively removed by adopting the circulating water, the adaptability is strong, the operation is simple and convenient, the energy is saved, the environment is protected, and the product yield is improved.

The application discloses a non-contact natural gas dehydration heating equipment and relates to the technical field of natural gas processing.The first spiral heating pipe and the second spiral heating pipe arranged in a spiral cross manner are arranged in the isolation heating barrel, so that the natural gas can be fully heat-exchanged during conveying.The natural gas is heated in isolation from high-temperature water, water mist entrained in the natural gas can be effectively evaporated, and the water-vapor separation efficiency is improved.Compared with a traditional single-stage heat-exchange pipe line design, the staggered spiral pipe increases the heating area and the heat transfer path, so that the fine water mist particles in the natural gas can be completely gasified, and a good premise is provided for subsequent condensation separation; the condensation separation piece adopts a rotating structure, and grooves are arranged on the surface, so that the condensation area and the water drop adhesion capacity are significantly increased.Meanwhile, the centrifugal force is generated during the rotation of the separation piece, the condensed water can be quickly thrown away from the surface, the condensed water can enter the collecting groove and be guided to the water storage pool, and the water drops are prevented from being mixed into the natural gas again.

The utility model relates to the technical field of natural gas treatment, in particular to nitrogen removal and purification equipment for heavy components of natural gas, which comprises a nitrogen removal kettle, a feed pipe is communicated with the top end of the nitrogen removal kettle, a discharge pipe is communicated with the bottom end of the nitrogen removal kettle, a limit ring is arranged in the middle of the inside of the nitrogen removal kettle, and the discharge pipe is communicated with the top end of the nitrogen removal kettle. A separation assembly is arranged in the limiting ring and comprises a limiting groove formed in the center of the limiting ring. According to the device, the mounting frame can be quickly fixed, the device is convenient to use, the polymeric membrane on the mounting frame can perform denitrification treatment on natural gas entering the denitrification kettle, the denitrification difficulty can be reduced, the denitrification efficiency can be improved, meanwhile, a user can conveniently take out the polymeric membrane on the mounting frame for replacement or cleaning, and the practicability is high. The selective passing ability of the polymeric membrane can be guaranteed, nitrogen separation is facilitated, the polymeric membrane can be fixed through cooperation of the limiting blocks and the limiting plates, the stability of the polymeric membrane can be guaranteed, and nitrogen separation is facilitated.

The present application relates generally to processes, systems, and compositions for disposal of liquid elemental mercury (Hg0) collected during processes such as crude and natural gas processing. In one embodiment, the application pertains to a process for converting Hg0 to HgS. The process comprises electrolytically oxidizing an aqueous composition comprising Hg0 to form dissolved Hg2+ in the presence of a composition comprising acetylacetone; sodium perchlorate; and perchloric acid. The formed dissolved Hg2+ is reacted with Na2S to form HgS. The formed HgS may be separated using a solid-liquid separation process.

The invention provides a compressor waste heat utilization system and method, and belongs to the technical field of oil field waste heat recycling, the system comprises a natural gas loop and a produced liquid loop, the natural gas loop comprises a compressor, the compressor comprises multiple stages of compression mechanisms arranged in a stacked mode, and the compressor pressurizes natural gas step by step through the multiple stages of compression mechanisms; the natural gas loop and the produced liquid loop share a plurality of heat exchangers, the heat exchangers in the natural gas loop correspond to the compression mechanisms, the heat exchangers are arranged at the rear ends of the compression mechanisms of the same stage, and natural gas and produced liquid conduct heat interaction through the heat exchangers. The method comprises the steps that the heat exchange process is subjected to analog calculation, step-by-step pressurization is conducted through the compressor, and multi-stage heat exchange is conducted through the heat exchanger. According to the system and the method, interstage compression waste heat utilization can be carried out on the compression mechanism, interstage heat and produced liquid are subjected to heat exchange, produced liquid heating is achieved, the waste heat utilization efficiency is improved, and meanwhile the energy consumption of a natural gas treatment system and the energy consumption of an oil and gas gathering and transportation treatment system are further reduced.

A natural gas processing system is mounted on a mobile platform that is transported to a natural gas source, such as a well. The system supplies natural gas to operate multi-fuel engines for wellfield equipment such as pumps, compressors, and drills. A liquid drain discharges contaminants. A water separator and a particulate filter remove particulate matter and liquid contaminant matter from the natural gas. A thermoelectric generator powered by the natural gas supplies process electricity. A process control monitors and controls the natural gas processing system, including pressure, temperature, moisture, and flow sensors. A gas chromatograph will determine the chemical composition of the natural gas. An emergency shutdown system will halt the process in the event of high liquid levels, a gas leak, fire, or gas composition out of specification, to include: H2S, H2O, Percent Mole Composition (BTU), Pressure, Temperature, and Flow Rate.

The utility model discloses a triethylene glycol dehydration device tail gas recovery processing sledge, which relates to the technical field of natural gas processing, and comprises a pretreatment part and a main processing part, the pretreatment part comprises a cooler, a refrigerating unit and a gas-liquid separation tank, the refrigerating unit is used for providing a refrigerant for the cooler, and the cooler is used for reducing the temperature of tail gas; the gas-liquid separation tank is used for separating liquid in the tail gas; the main treatment part comprises a gas-liquid mixed transportation pump and an analysis tank, the gas-liquid mixed transportation pump and the analysis tank are in closed circulation, the gas-liquid mixed transportation pump is used for pressurizing tail gas, and the analysis tank is used for analyzing dissolved-state light hydrocarbon into fuel gas. Through the synergistic effect of the refrigerating unit and the cooler, the tail gas is cooled to be below the dew point of a high-dew-point gaseous substance, and liquid components in light hydrocarbon can be separated and liquid triethylene glycol can be recycled by combining the gas-liquid separation tank; a closed flash evaporation cycle is constructed by adopting an analysis tank and a gas-liquid multiphase pump, and dissolved-state light hydrocarbon is analyzed into fuel gas, so that the loss rate of triethylene glycol can be reduced.

Example gas recovery systems disclosed herein include a source gas conditioning assembly comprising a compression component and swing adsorption component configured to provide a conditioned source gas, a first membrane assembly to separate the conditioned source gas into a hydrocarbon enriched stream and a recovery stream, a second membrane assembly to separate the hydrocarbon enriched stream into a hydrocarbon product stream and a recycle stream, a carbon dioxide plant assembly to provide a carbon dioxide product stream and an enriched recycle stream, and a standalone membrane assembly at least selectively fluidly coupled to the enriched recycle stream, and separates the enriched recycle stream into a hydrocarbon enriched recycle stream and an effluent stream. The swing adsorption component is at least selectively coupled to the enriched recycle stream. The source gas conditioning assembly is fluidly coupled to the recycle stream, and at least selectively coupled to the hydrocarbon enriched recycle stream.

A gas management system is disclosed. The gas management system according to the present embodiment includes a natural gas processing apparatus configured to separate heavy hydrocarbons contained in natural gas and a natural gas liquefaction apparatus configured to provide cold energy to the natural gas, and may reduce facility building and operation costs because the heavy hydrocarbons are separated by receiving the cold energy during a process of liquefying the natural gas without building a separate facility for separating the heavy hydrocarbons from the natural gas.

The present invention discloses a helium refining method and device thereof, and relates to the technical field of natural gas processing and helium recovery. The device comprises a crude helium extraction unit, a catalytic dehydrogenation unit, a helium refining unit and a filling unit. The BOG raw gas is subjected to the crude helium extraction unit to obtain a mixed gas of hydrogen and helium with a content of more than 95%, the hydrogen content is reduced to less than 1 ppm by the catalytic dehydrogenation unit, and the gas is purified to high-purity helium that meets the requirements by the helium refining unit. The crude helium extraction unit of the present invention adopts a room temperature pressure swing adsorption coupled membrane separation method to extract helium, which solves the problems of high energy consumption, low operational flexibility, unstable operation and high investment in low-temperature processes. At the same time, the analytical gas and the downstream vent gas generated by the room temperature pressure swing adsorption component are recycled, and a dirty gas re-purification pipeline interface is provided to reduce the pressure of the low-purity helium and return it to the helium refining unit for re-purification, thereby realizing the secondary recovery of methane-rich gas and improving the recovery rate of helium.

The invention relates to the technical field of natural gas treatment, and discloses a natural gas dehydration method and system.The natural gas dehydration method comprises the steps that S1, water-containing natural gas is atomized through a Venturi tube; s2, the atomized water-containing natural gas enters a cyclone separator to be subjected to gas-liquid separation; s3, judging whether the gas-liquid separation efficiency of the cyclone separator meets a preset requirement or not, if not, returning to the step S1, and if yes, executing the step S4; and S4, carrying out fine dehydration treatment on the natural gas subjected to gas-liquid separation. The combined design of the Venturi tube and the cyclone separator is adopted, efficient dehydration of natural gas is achieved, the process steps are simplified, energy consumption is effectively reduced, economical efficiency is improved, the overall structure is simplified, equipment layout is greatly simplified, equipment cost and maintenance difficulty are reduced, and system reliability is improved.

A natural gas (NG) processing plant and method of operating the NG processing plant including: receiving feed NG, removing acid gas from the feed NG gas via a gas sweetening unit having an amine absorber column that absorbs the acid gas, collecting an amine sample in the gas sweetening unit, removing water from the feed NG via a NG dehydration system having a column vessel that contacts the feed NG with liquid desiccant including glycol to remove the water, collecting a glycol sample in the NG dehydration system, adding reagent water and ferrozine to each of the amine sample and the glycol sample, and measuring total dissolved iron via ultraviolet-visible (UV-Vis) spectrophotometry in each of the amine sample and the glycol sample.