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Kemper County IGCC Project Update. The Kemper County IGCC Project is a lignite- fueled 2 x 1 integrated gasification combined cycle (IGCC) facility that uses the air- blown TRansport Integrated Gasification (TRIG) technology jointly developed by Southern Co., KBR, and the Department of Energy (DOE) at the Power Systems Development Facility (PSDF) in Wilsonville, Alabama. The facility is being built by Mississippi Power Co.

MPC), a Southern Co. The plant is located approximately 2. Meridian, Miss. (Figure 1).

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Kemper County IGCC site 3- D representation. Courtesy: KBR Inc. The plant in Kemper County is adjacent to a viable lignite reserve developed and mined by Liberty Fuels, a subsidiary of North American Coal Corp., which will provide feedstock for the IGCC plant.

The facility will produce electricity in an efficient and environmentally friendly manner with a syngas- only net output capability of 5. MW and with a peak net output capability of 5. MW, using syngas in the combustion turbine coupled with natural gas firing in the heat recovery steam generator (HRSG). The facility will produce marketable by- products of ammonia, sulfuric acid, and carbon dioxide (CO2). Showtime Full The Finest Hours Online Free. Approximately 6. 5% of the CO2 will be captured and used for enhanced oil recovery (EOR), making the Kemper County facility’s carbon emissions comparable to those of a natural gas–fired combined cycle power plant. Commercial operation is scheduled for May 2.

TRIG Technology. The TRIG technology, derived from fluidized catalytic cracking units used in the petrochemical industry, uses a pressurized, circulating fluidized bed unit. The transport gasification system features higher efficiencies and is capable of processing low- rank coals such as lignite. Watch Complete Unknown Online Full Movie.

Commercial TRIG units can be designed to achieve high environmental standards for SO2, NOx, dust emissions, mercury, and CO2. Cost analysis based on extensive design has shown that the economic benefits offered by the air- blown transport gasifier relative to other systems are preserved even when CO2 capture and sequestration are incorporated into the design. The largest transport gasifier built to date commenced operation in 1. Southern Co.’s Power System Development Facility near Wilsonville, Ala. The gasifier and auxiliary equipment at the PSDF were sized to provide reliable data for confident scale- up to commercial scale.

The demonstration unit has proven easy to operate and control, achieving more than 1. The demonstration- scale gasifier has successfully gasified high- moisture lignite from the Red Hills Mine in Mississippi in four separate test campaigns for more than 2,3. On lignite, the transport gasifier operated smoothly over a range of conditions, confirming the gasifier design for Kemper County.

Process Overview. The Kemper County IGCC facility is located on a 2,9. A block flow diagram of the overall process is shown in Figure 2. Kemper County IGCC block flow diagram (download pdf). Courtesy: KBR Inc. There are two separate gasification trains.

Each train supplies syngas to a single combustion turbine and HRSG. Each gasification train has three parallel coal- drying and - milling units, and each of these units feeds two high- pressure (HP) coal feed systems. There are two process air compressors per gasification train. About 6. 0% of the process air is supplied by the process air compressors, with the remainder extracted from the combustion turbine located in the power island. Six proprietary pressure decoupled advanced coal (PDAC) feeders developed at the PSDF will supply each of the two gasifiers with raw lignite at a rate of 5.

A proprietary continuous fine ash depressurization (CFAD) and a proprietary continuous coarse ash depressurization (CCAD) system cool and depressurize the ash for storing in a silo and for disposal. Syngas from the gasifier is cooled in the primary syngas cooler to produce HP superheated steam, which is sent to the power island for power generation in the HP steam turbine.

Syngas from the syngas coolers is routed to the particulate control device (PCD), where the fine ash is removed by CFAD. The particulate free sour syngas is scrubbed with water in the syngas scrubber to remove halogens and other contaminants and to saturate the syngas to facilitate shift reaction.

The syngas leaving the scrubber undergoes water gas shift reaction, where about 9. CO is converted to CO2. The plant is designed to match the natural gas equivalency for carbon emission. The sour gas is scrubbed and shifted, and then passes through a COS hydrolysis reactor and is routed through the ammonia scrubber to remove ammonia, an acid gas removal (AGR) unit to remove sulfur and CO2, and a mercury removal bed before being sent to the gas turbine for power generation. The AGR unit consists of UOP LLC’s SELEXOL Process. The H2. S and CO2 absorbers in the AGR unit remove greater than 9. H2. S and a portion of CO2 from syngas using SELEXOL, a physical solvent.

The captured H2. S is later stripped from the solvent using steam heat, producing a concentrated H2. S stream, while the purified solvent is refrigerated and recycled to the absorption units. The concentrated H2.

S acid gas stream is routed to a sulfuric acid plant, where the sulfur is converted into commercial grade sulfuric acid using Haldor Topsøe’s WSA Process. The removed CO2 stream is dehydrated and compressed and sold as a by- product for EOR, resulting in its geologic storage. The sour water from syngas scrubber is stripped in three columns to remove H2. S, CO2 that is sent back to the AGR unit, and a salable ammonia product. The stripped water is used for CWT  makeup. Benefits of the KBR Transport Gasifier. The TRIG gasifier offers a simpler, more robust method for generating energy from coal than other available alternatives.

It is unique among coal gasification technologies in that it is cost- effective when handling low- rank coal, as well as coals with high moisture or high ash content. There are many other important characteristic of TRIG, such as: An advanced nonslagging pressurized circulating fluidized bed gasifier design that operates at moderate temperatures (1,5. F to 1,9. 50. F). No internals, expansion joints, valves, or other moving parts (Figure 3).

A design that operates using air or oxygen, or enriched air/oxygen mixtures as the oxidant, based on the end user’s application. Its operating range can achieve higher carbon conversions and mitigate tar and oil formation. The capability to achieve natural gas equivalency of CO2 emission with proper downstream equipment. Schematic of the TRIG gasifier.

Source: KBR Inc. Engineering TRIGThe detailed engineering work is being executed by both KBR and Southern Company Services (SCS) with procurement and construction management by SCS for this TRIG technology project. In addition to the engineering effort associated with the scale- up to commercial scale, some of the other areas worth noting in the engineering design and execution are discussed below.

System Integration. There is a high level of heat integration between gasification, gas cleanup, and power generation. This required a high degree of system integration, including the plant controls. One of the goals during the process design phase was to maximize overall plant efficiency with carbon capture. Multiple options for heat integration between gasification, gas cleanup, and power generation were evaluated.

This enabled the process to meet a projected plant heat rate of 1. Btu/k. Wh while using coal with an average of 4. CO2 removal. Steam is a product from the gasifier island, and therefore a high level of heat integration helped to lower the overall plant station service. Unlike a natural gas combined cycle plant, where the natural gas flow from pipeline to the combustion turbine can be adjusted based on demand, system integration in this IGCC plant requires integration between combustion turbine load requirements and coal and air feed to the gasifier.