Gas Sweetening | Gas Treating | Gas Processing | Natural Gas Engineering

Gas Sweetening
www.GasSweetening.com

Amine Plants * Emissions Engineering * Gas Gathering * Gas Processing * H2S Removal

Midstream Natural Gas * Natural Gas Engineering * Natural Gas Treating * Stranded Gas Solutions

info@GasSweetening.com

Follow @GasSweetening

Sulfur exists in natural gas and is known as hydrogen sulfide (H2S). Natural gas is usually considered "sour" if hydrogen sulfides content exceeds 5.7 milligrams of H2S per cubic meter of natural gas. The process hydrogen sulfide removal from sour gas is commonly referred to as "gas sweetening."

The primary process for sweetening "sour" natural gas ("sour" natural gas contains H2S or hydrogen sulfides) is quite similar to the processes of glycol dehydration and NGL absorption. In this case, however, amine solutions are used to remove the hydrogen sulfide. This process is known simply as the 'amine process', or alternatively as the Girdler process, and is used in 95 percent of U.S. gas sweetening operations. The sour gas is run through a tower, which contains the amine solution. This solution has an affinity for sulfur, and absorbs it much like glycol absorbing water. There are two principle amine solutions used, monoethanolamine (MEA) and diethanolamine (DEA). Either of these compounds, in liquid form, will absorb sulfur compounds from natural gas as it passes through. The effluent gas is virtually free of sulfur compounds, and thus loses its sour gas status. Like the process for NGL extraction and glycol dehydration, the amine solution used can be regenerated (that is, the absorbed sulfur is removed), allowing it to be reused to treat more sour gas.

Although most sour gas sweetening involves the amine absorption process, it is also possible to use solid desiccants like iron sponges to remove the sulfide and carbon dioxide.

Sulfur can be sold and used if reduced to its elemental form. Elemental sulfur is a bright yellow powder like material, and can often be seen in large piles near gas treatment plants, as is shown. In order to recover elemental sulfur from the gas processing plant, the sulfur containing discharge from a gas sweetening process must be further treated. One sulfur recovery process is called the "Claus" process, and involves the use of thermal and catalytic reactions to extract the elemental sulfur from the hydrogen sulfide solution.

Our "Integrated" CHP Systems (Cogeneration and Trigeneration) Plants
Have Very High Efficiencies, Low Fuel Costs & Low Emissions

The Effective Heat Rate is Approximately
4100 btu/kW & System Efficiency is 92% Plant

The CHP System below is Rated at 900 kW and Features:
(2) Natural Gas Engines @ 450 kW each on one Skid with Optional
Selective Catalytic Reduction system that removes Nitrogen Oxides to "non-detect."

Our CHP Systems may be the best solution for your company's economic and environmental sustainability as we "upgrade" natural gas to clean power with our clean power generation solutions.

Our Emissions Abatement solutions reduce Nitrogen Oxides to "non-detect" which means our Trigeneration energy systems can be installed and operated in most EPA non-attainment regions!

We provide natural gas engineering and midstream oil and gas services which are led by an independent natural gas engineering firm that assists our company with acquisitions and project development services in the following areas;

Our engineering team provides complete natural gas engineering services from the wellhead to the burner-tip with a focus in the midstream sector. Our midstream oil and gas engineering and project development development services include;

Our work is performed on a strict adherence to "vendor-neutrality" and seek to maximize our client's "triple bottom line" returns: people, planet and profits.

To receive a preliminary, no obligation consult, email us a summary or overview of your project, including the following basic information:

Amine plants are used for "gas sweetening" in the midstream oil and gas sector known as "gas processing." Amine plants provide H2S removal as well as CO2 removal from natural gas and liquid hydrocarbons. The process involves both absorption and chemical reactions.

We provide amine plant sales and natural gas processing and engineering services.

Gas compressors are mechanical device that increase the pressure of a gas by reducing its volume. Gas compressors are responsible for moving the natural gas from the oil or natural gas production well to homes and businesses via natural gas pipelines and gas compression stations.

Natural Gas Processing plants separate the various hydrocarbons and natural gas liquids from the pure natural gas (methane or CH4) to produce what is known as 'pipeline quality' natural gas. Natural gas pipeline companies have requirements on natural gas they buy from producers which is why the natural gas processing plants are located where they are, and why they separate the ethane, propane, butane, and pentanes from the methane. Natural gas liquids or NGLs include ethane, propane, butane, iso-butane, and natural gasoline.

Glycol dehydration is used in the production and processing of natural gas by using a liquid desiccant that removes water from natural gas and natural gas liquids (NGL).

H2S, or Hydrogen Sulfide, is a hazardous and corrosive element found in oil and natural gas which needs to be removed from the hydrocarbon before the oil or natural gas can be sold. The hydrogen sulfides are usually removed in a mid-stream gas processing facility by either iron sponges or amine plants.

What is a Heater Treater?

A "Heater Treater" is used in the oil and gas production process and is used to removes water and gas from the produced oil - and to improve its quality for sale into a crude oil pipeline or for other transport. A heater treater typically combines the following components inside the heater treater: a heater, free-water knockout, and oil and gas separator.

We are presently acquiring "midstream" energy plants and operations such as natural gas and natural gas liquids - along with the plant assets that treat natural gas - are found between exploration and production of oil and natural gas and the delivery to commercial, residential and industrial customers. Midstream energy assets include over 1 million miles of natural gas pipelines and 500 natural gas processing plants.

As natural gas is produced from either a natural gas well, or from an oilwell which contains "associated gas," the natural gas must be treated or processed before it can be used at a home or business as a fuel.

Natural gas treating or processing, takes place at gas processing plants to remove the impurities and other hydrocarbons other than the methane itself, or CH4.

The by-products and impurities of natural gas that must be treated or processed include; ethane, propane, butane, isobutane, pentane, isopentane and higher molecular weight hydrocarbons, as well as H2S or elemental sulfur, carbon dioxide (CO2), water vapor and sometimes helium and nitrogen.

In most cogeneration and trigeneration power and energy systems, the exhaust gas from the electric generation equipment is ducted to a heat exchanger to recover the thermal energy in the gas. These heat exchangers are air-to-water heat exchangers, where the exhaust gas flows over some form of tube and fin heat exchange surface and the heat from the exhaust gas is transferred to make hot water or steam. The hot water or steam is then used to provide hot water or steam heating and/or to operate thermally activated equipment, such as an absorption chiller for cooling or a desiccant dehumidifer for dehumidification.

Many of the waste heat recovery technologies used in building co/trigeneration systems require hot water, some at moderate pressures of 15 to 150 psig. In the cases where additional steam or pressurized hot water is needed, it may be necessary to provide supplemental heat to the exhaust gas with a duct burner.

In some applications air-to-air heat exchangers can be used. In other instances, if the emissions from the generation equipment are low enough, such as is with many of the microturbine technologies, the hot exhaust gases can be mixed with make-up air and vented directly into the heating system for building heating.

In the majority of installations, a flapper damper or "diverter" is employed to vary flow across the heat transfer surfaces of the heat exchanger to maintain a specific design temperature of the hot water or steam generation rate.

In some co/trigeneration designs, the exhaust gases can be used to activate a thermal wheel or a desiccant dehumidifier. Thermal wheels use the exhaust gas to heat a wheel with a medium that absorbs the heat and then transfers the heat when the wheel is rotated into the incoming airflow.

A professional engineer should be involved in designing and sizing of the waste heat recovery section. For a proper and economical operation, the design of the heat recovery section involves consideration of many related factors, such as the thermal capacity of the exhaust gases, the exhaust flow rate, the sizing and type of heat exchanger, and the desired parameters over a various range of operating conditions of the co/trigeneration system — all of which need to be considered for proper and economical operation.

Engineering, Procurement and Construction
(EPC) Contracts and Performance Guarantees

Engineering Procurement Construction, also referred to as; Engineer Procure Construct, "EPC" or Engineering Procurement and Construction, is the terminology used when an owner, for example, is seeking to build a new cogeneration power plant uses when the owner is seeking a "turnkey" project solution. EPC contracts are not only a very common form of contracting within the construction industry, but increasingly becoming the norm, particularly in the electric power generation (power plants) and utility sector.

The construction company, via the EPC contract with the owner, provides for the design, engineering, procurement of all related supplies, components, materials, labor, services, etc. The contractor, with approval/permit by EPC contract with the owner, may sub-contract part of the work.

Engineering Procurement and Construction contracts give the owner unprecedented assurance that the system will provide the long-term energy benefits advertised without wasting time and money with the Architectural and Engineering ("A&E") firm or expensive change orders that take additional time and resources to process and integrate. These performance guarantees cover the entire installation and go way beyond manufacturer warranties that only cover specific parts and not the system as a whole.

EPC and performance guarantee contracts can be a wise choice for many reasons. Oftentimes, the Architectural and Engineering firms do not have the in-house expertise to understand fully how to specify renewable energy systems. Due to the newer nature of these technologies and the rapidly developing nature of many technologies, this is a specialized field of its own for each renewable technology type. If the Architectural and Engineering company specifies particular equipment, while it may be feasible, it may not be the optimal design or the most likely to be available at construction.

EPC contracts also provide more flexibility in equipment choices that can reduce change orders and construction delays. For example, many photovoltaic modules change specifications and dimensions on almost a monthly basis. Even the oldest and most reputable manufacturers are working to keep pace with fierce competition in the field today. Given that the modules are the heart of the photovoltaic system, it reasons that specifying a particular module in the construction documents might result in a change order and result in cost over runs and delays by actual construction.

Contractor Benefits

In an EPC contract with a performance guarantee, the contractor has a strong financial incentive to use the most reliable and highest performing equipment and to ensure the highest standards are maintained throughout installation and that any details that could influence long-term performance are addressed. Practices ranging from cherry picking the highest output modules to over-sizing wiring and conduit to improved operations and maintenance (O&M) plans might not be necessary for inspection or commissioning but can contribute to meeting the contractor's long-term performance liability. These same practices in turn enhance the long-term energy performance to the greater benefit of the facility and those that operate it.

Performance guarantee contracts attract top renewable energy contractors with long-term success in their fields. Less capable or experienced contractors will not savor the extra liability involved, nor will they have the expertise or even access to the top quality equipment necessary to fulfill a performance guarantee.

Contract Provisions

Certain provisions should be included with any EPC contract to ensure coordination and consistency with the remainder of the project. All contracts and subcontracts related to the project should include provisions requiring participation in the integrated design process including coordination of design with other related aspects of the project.

The EPC contractor needs to work with the Architectural and Engineering firm to understand the building elements that are necessary to the integration of the renewable energy system. In addition, an EPC contract needs provisions to ensure coordination with the larger project construction team. While coordination is important, this type of design and construction contract allows the contractors to do what they do best and frees more of the agency's critical planning resources for other aspects of the project.

Additional provisions standard with other construction contract terms should also be included in the EPC contract. These include requiring the team to perform enhanced commissioning over the first year and developing an O&M manual and training for the system.

Through a combination of EPC contracts combined with long-term performance guarantees, the construction relationship is transformed from being sometimes adversarial to being a win/win situation for everyone involved.

“spending hundreds and hundreds and hundreds of billions of dollars every year for oil, much of it from the Middle East, is just about the single stupidest thing that modern society could possibly do. It’s very difficult to think of anything more idiotic than that.”

Engineering, Procurement and Construction (EPC) Contracts and Performance Guarantees

Contractor Benefits

Contract Provisions

Engineering, Procurement and Construction
(EPC) Contracts and Performance Guarantees