GreenGen
| Company type | Initiative / Joint venture |
|---|---|
| Industry | Energy / Power generation |
| Founded | 2004 |
| Founder | China Huaneng Group (CHNG) |
| Headquarters | Tianjin , China |
Area served | China |
| Products | Low-emission coal-fired power, hydrogen |
| Owner | China Huaneng Group and partners (China Datang Group, China Huadian Corporation, China Guodian Corporation, China Power Investment Corporation, Shenhua Group, State Development & Investment Co., China Coal Group) |
GreenGen (Chinese: 绿色煤电; pinyin: lǜsèméidiàn, meaning 'green coal electricity') represents a Tianjin-based initiative in China dedicated to advancing advanced, low-emission coal-fired power technologies.
Motivation
Given coal's status as China's dominant energy source, the GreenGen project seeks to promote sustainable power generation by minimizing pollutant output. It utilizes coal gasification technology to produce hydrogen alongside electricity, aligning with China's objectives to enhance energy efficiency and lower greenhouse gas emissions amid increasingly stringent global CO2 restrictions.
History
Initiated in 2004 by the China Huaneng Group (CHNG), GreenGen has evolved through three distinct stages of development. The following year, GreenGen Ltd. Co. was formed through a partnership between CHNG and several leading state-owned enterprises, including China Datang Group, China Huadian Corporation, China Guodian Corporation, China Power Investment Corporation, Shenhua Group, State Development & Investment Co., and China Coal Group.
The Lingang Industrial Park was selected as the project site due to its close proximity to chemical industry facilities, allowing efficient utilization of byproducts such as CO2 for industrial processes.
During Phase 1 (2009-2012), efforts centered on building a 250 MW integrated gasification combined cycle (IGCC) facility that converts coal into gas prior to combustion to boost efficiency and reduce emissions. Although originally planned for operation in 2012, the plant began functioning that year following some delays. Phase 2 commenced in 2014, integrating fuel cells and turbines while employing captured CO2 for industrial uses. The third phase focused on constructing a 400 MW demonstration plant that combined these technologies to further decrease emissions.
In 2007, Peabody Energy, the world’s largest private coal producer, joined the initiative.
By 2012, GreenGen had completed construction and remained China's sole operational IGCC plant as of 2020, representing a major advancement in clean coal technology since its inception in the 1980s. The project has also encouraged international cooperation; notably, the U.S. Department of Energy collaborated with CHNG to transfer GreenGen's expertise to the Texas Clean Energy Project (TCEP).
Project
The GreenGen IGCC facility comprises several key components: a coal gasifier, an air separation unit, a syngas purification system, a methyldiethanolamine-based sulfur removal unit, and a power block containing both gas and steam turbine generators along with a heat recovery steam generator. The coal gasifier was designed by the Huaneng Clean Energy Research Institute. The air separation unit produces liquid oxygen, nitrogen, and argon.
The gasifier processes approximately 2000 tonnes of coal daily into syngas—a mixture of carbon monoxide and hydrogen—using high-purity oxygen within a water wall-cooled reactor system where up to 99% of the oxygen reacts to form syngas.
Impurities such as particulate matter and sulfur compounds are eliminated through a combination of dry and wet cleaning methods situated between the gasification unit and the combined-cycle power block.
The combined-cycle power section uses a gas turbine fueled by syngas to generate electricity; its exhaust gases then drive a Heat Recovery Steam Generator (HRSG). Steam produced by the HRSG powers a steam turbine, thereby maximizing electrical output by capturing waste heat.
This integrated process achieves an efficiency rate of approximately 41% when utilizing Shenhua coal.
Criticism
At present, IGCC facilities are unable to economically rival conventional coal-fired power stations in China; the cost of electricity generated by coal plants is roughly half that produced by IGCC technology.
The discussion surrounding the expansion of IGCC capacity remains divided: advocates emphasize its value for advancing research and technological innovation, whereas critics caution against the potential financial burdens it may impose on state-owned power enterprises.
Comparisons
An IGCC plant utilizing Shell technology in the United States is often referenced as a standard. The combined expenses for equipment, materials, and labor at the US Shell IGCC facility are approximately 1.5 times greater than those incurred by GreenGen’s plant in China. Specifically, the gasifier section of the Shell plant costs around $1065 per kilowatt, compared to $267 per kilowatt for GreenGen’s installation, underscoring China's cost-efficiency advantage in building IGCC infrastructure.