The gasification fly ash (GFA), a bulk industrial solid waste from coal gasification process, urgently needs to be effectively disposed. In order to use the GFA as porous carbon materials, fluidized activation experiments of the GFA from an industrial circulating fluidized bed (CFB) gasifier were conducted in a benchscale CFB test rig, as well as steam activation experiments of GFA in a ...
Coal combustion and gasification are the processes to utilize coal for production of electricity and many other applications. Global energy demand is increasing day by day. Coal is an abundant source of energy but not a reliable source as it results into high CO2 emissions. Energy industries are expected to decrease the CO2 emission to prevent global warming. Coal gasification is a process ...
A process optimization method has been developed and applied to study the coal gasification for the production of hydrogen. The boundary definition and the identification of main units
The rest of this article proceeds as follows: The SCGP is briefly introduced in Section operation optimization model is established in Section validate the effectiveness of the proposed model, an industrial coal gasification process is studied and the optimization result is analyzed in Section article is ended with a conclusion in Section 5.
Feeding variability appears extensively in phenol and ammonia recovery process of coal chemical plant, which has caused severe problems in effluent quality. This study is aim to take the feeding variability into consideration for process optimization and analysis of the phenol and ammonia recovery process, have been not studied in previous efforts.
When designing the coal gasification process, use the RGibbs model [16] or other models to simplify the coal gasifier in one dimension, ... Structural optimization of coal gasification furnace. The height of the gasifier studied in this paper is m. The prototype gasifier has only one set of four opposed nozzles, which leads to the uneven ...
Recently, chemical looping gasification (CLG) has attracted much attention as a promising highpurity syngas production technology derived from the concept of the chemical looping [8].The principle of the CLG process is shown in Fig. process partially oxidizes solid fuel to obtain syngas by reduction through oxygen loss (Me x O y1) in the fuel reactor (FR) and oxidation through oxygen ...
The coal gasification process usually requires two agents: an oxidation agent and a gasification agent (usually steam). The oxidation agent is oxygen but it can be delivered to the gasifier either as air or as nearly pure oxygen (perhaps 95% pure) (AlZareer et al., 2016c). ... Most research on the optimization of coal gasification has focused ...
The results of exergy analyses can provide valuable insights into the design, assessment and optimization of SCWG processes or systems. Section snippets Coal gasification process. Coal gasification is an endothermic process, the heat required for gasification can be supplied by partial oxidation of feedstock (autothermal gasification) or by an ...
Carbon dioxide (CO 2) emission reduction has become an urgent topic to be studied and solved with the indepth understanding of global warming and frequent occurrence of extreme present, the application of chemical looping technology in coal gasification to produce high purity synthesis gas is an important way to achieve CO 2 emission reduction, ensure energy security, and promote ...
Abstract. After successful completion of the demonstration phase on Illinois No. 5 coal, SCGP1, the Coal Gasification plant at Dee Park Texas, entered the coal feedstock phase, with the primary focus on gasifying a wide variety of coals, and a parallel experimental phase for process optimization and confirmation of several process improvements.
Semantic Scholar extracted view of "Comprehensive optimization of coal chemical looping gasification process for low CO2 emission based on multiscale simulation coupled experiment" by Z. Cui et al.
In the entrained flow coal gasification process, the gas production is critically affected by the operating temperature (OT) and coal ash melting point (AMP), and the AMP is one of key factors for ...
1. Introduction. China is the world's largest producer and consumer of coal, and coal remains fundamental to China's energy and chemical industries [1].The modern coal chemical industry requires an effective approach to improve the efficient utilization level of coal and achieving the transformation of coal from a monofuel to an equal emphasis on fuel and raw materials, as it is ...
Optimization of an advanced coalfired integrated gasification combined cycle system requires an accurate numerical prediction of gasifier performance. While the turbulent multiphase reacting flow inside entrainedflow gasifiers has been modeled through computational fluid dynamic (CFD), the accuracy of submodels requires further improvement.
The optimization study is performed by a numerical optimization using the DesignExpert 11 software. The goal is to depict the optimum conditions for maximizing H 2, CO, CGE and CC from SPL gasification process. The optimum operating conditions for SPL gasification process are tabulated in Table 8. The selected simulation solution is the one ...
Section snippets Process description. The studied system is based on a typical billion Nm 3 SNG/y CtSNG project with 580 t/h of feed coal. A typical CtSNG process is illustrated in Fig. 2. Initially, the coal mixed with steam reacts with oxygen from air separation unit (ASU) in coal gasification unit (CGU) to produce crude syngas.
For the downstream synthesis process, no matter what the end product is, there is one common prerequisite: the syngas (mostly H 2 and CO) generated from the gasification process must contain as few impurities and inert species such as nitrogen as possible. Traditionally, this requirement is met by using pure oxygen instead of air as gasifying ...
Coal gasification is recognized as the core technology of clean coal utilization that exhibits significant advantages in hydrogenrich syngas production and CO2 emission reduction. This review briefly discusses the recent research progress on various coal gasification techniques, including conventional coal gasification (fixed bed, fluidized bed, and entrained bed gasification) and relatively ...
Texaco coal gasification process is a typical wet feeding system, and Texaco entrained flow gasifiers are widely used, especially in Integrated Gasification Combined Cycle (IGCC) [25,26]. ... Heat Exchanger Networks (HEN) synthesis and optimization is an important field in process integration and different objective functionshave been used to ...
The mathematical model used to study the entrained flow coal gasification process is based on the commercial CFD software Ansys Fluent [70] which incorporates the finitevolume method. ... Coal gasification results. The optimization of global devolatilization models was performed through the iterative procedure. Hence, the simulation results ...
Gasification is a technological process that can convert any carbonaceous (carbonbased) raw material such as coal into fuel gas, also known as synthesis gas (syngas for short). Gasification occurs in a gasifier, generally a high temperature/pressure vessel where oxygen (or air) and steam are directly contacted with the coal or other feed material causing a series of chemical reactions to ...
In the coal gasification process of converting coal to SNG, coal is gasified with steam and oxygen. The gasification process produces carbon monoxide (CO), hydrogen (H 2), carbon dioxide (CO 2), methane (CH 4), and higher hydrocarbons such as ethane and propane [5]. Methanation reaction is the main process of converting coal to gas.
Then, optimization study using modelling software, life cycle assessment, and circular economy is inevitable. Finally, sufficient funding is required for commercialization. ... Aquatic risk assessment based on the results of research on mine waters as a part of a pilot underground coal gasification process. Process Saf Environ 148:548558 ...
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