1. Introduction. Coal gasification is a process in which coal reacts with gasification agents (, steam, O 2 /air, and CO 2) at a certain temperature and pressure to produce clean synthesis gas, which can be used as gaseous fuel or as a raw material for chemical synthesis to produce various chemical products and liquid gasification is an important way to achieve the clean and ...
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 an efficient, clean and versatile process, which can be adapted for producing hydrogen [2]. The comparison of different technologies as well as the
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 ...
Design process Sarongga coal, as raw material, was quite good with low ash content of 5% asreceived basis, although total moisture is relatively high, about 40%. In general, the coaltomethanol process consists of 3 main processes, namely coal gasification, syngas cleaning, and methanol synthesis, as shown in Figure 3.
The thermoeconomic optimization of the improved gasification process with CWS preheating technology using multiobjective optimization is a tradeoff between cold gas efficiency and total cost. The MOGA is conducted to maximize CGE and minimize C tot generating 100 samples initially and 100 samples per iteration. As the convergence criterion ...
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.
Advanced char conversion models are capable of predicting char consumption by oxidation and gasification. The following section presents two approaches used to integrate such advanced char conversion kinetics into CFD, namely SNOR and SNOI [ 108, 128 ]. SNOR stands for "single nth order reaction".
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 ...
This process is detailed modeled by dividing it into coal gasification, water gas shift, acid gas removal, dimethyl oxalate synthesis, ethylene glycol synthesis, and ethylene glycol refining units. After comparing and verifying with literature and industrial data, this work conducts a detailed advanced exergy analysis and optimization of the ...
By parameter optimization and process integration, ... For coal gasification, the pure oxygen is derived from air separation unit, which mainly uses cryogenic separation technology in coalbased chemicals and power plants. The cryogenic separation process is mature and capital intensive; however, it typically brings high energy consumption and ...
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
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 pilotscale gasification plant is used to perform a process optimization analysis for the gasification of PKS using coal bottom ash as a catalyst to assess the optimum conditions for producing the most H 2 and syngas composition.
Ju and Lee (2017) analyzed the energy efficiency of the coal gasification process in a shell gasifier for five different coals using a rigorous dynamic model. According to the obtained results, the performance of subbituminous gasification was considerably high in the shell gasifier regarding the lower energy density of subbituminous coals.
Coal gasification is a versatile process to convert a solid fuel in syngas, which can be further converted and separated in hydrogen, which is a valuable and environmentally acceptable energy carrier. Different technologies (fixed beds, fluidized beds, entrained flow reactors) are used, operating under different conditions of temperature, pressure, and residence time. Process studies should be ...
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 ...
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 ...
What is Gasification Gasification is a process that converts carbonaceous material, Such as fossil fuels and biomass in to a mixture of mostly hydrogen and carbon monoxide ( called Synthesis gas Syngas) The syngas can be burned as a fuel or processed to produced chemical and other fuels. 5. Basic Overview of gasification Coal or other fuels ...
A heat integration optimization method that considers the changes in process parameters is proposed to find the global optimal process scheme for a coal chemical company's phenols and ammonia recovery process. The phenols and ammonia recovery process is simulated by Aspen Plus, and a programming method for heat exchanger networks synthesis that can simultaneously optimize process parameters ...
1. Introduction. With the depletion of oil resources, it is important to improve clean coal technology and use coal resources in a more efficient way, which also helps in reducing pollutant emissions [1].Coal gasification is one of the most important clean coal technologies, and the Shell coal gasification process (SCGP) is a popular coal gasification process.
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 ...
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.
The entrainedbed coal gasification process is the cleanest and most efficient coal gasification technology (Fan 2013; Liu et al. 2010; Wang 2014). ... Improvement of adsorbent performance, technique process design and adsorption bed structure optimization are all necessary at this stage.
Coal gasificationbased FischerTropsch (FT) synthesis processes, often termed "coaltoliquids" (CTL) plants, are complex integrated energy systems which typically exploit the waste heat from gas turbines and/or a number of process units in a Heat Recovery Steam Cycle (HRSC).Besides converting waste heat into electricity, the HRSC can also supply heat to endothermic processes in the CTL ...
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.
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.
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.
Owing to China's unique energy structure, more than 97% of its ammonia is produced through coal gasification (Xiang and Zhou, 2018). However, the air separation system, which consumes a large amount of energy, provides pure oxygen and needs to separate CO 2 and H 2. This results in a high energy consumption in the gasification process.
The coalgasification wastewater treatment is the most difficult pollution control task for coalgasification plants. It is identified that there are two serious problems occurring in the current treatment process,, low performance of phenols removal and plugging induced by ammonia salts. A new treatment process is proposed in this paper to solve these severe problems and pursue clean ...
gasifier. (Show more) coal gasification, any process of converting coal into gas for use in illuminating and heating. The first illuminating gas was manufactured from coal in England in the late 18th century by the process of carbonization or destructive distillation, heating coal in the absence of air, leaving a residue of coke as a byproduct.
Dong, Z., et al. Modeling the Combustion of Coal in a 300MW Circulating Fluidized Bed Boiler with Aspen Plus. in 2010 AsiaPacific Power and Energy Engineering Conference. 2010. Simulation of Coal ...
The Department of Energy explains that coal gasification is a thermochemical process in which the gasifier's heat and pressure break down coal into its chemical constituents. The resulting "syngas" is comprised primarily of carbon monoxide and hydrogen, and occasionally other gaseous compounds. Proponents of coal gasification say that ...
The robustness of the efficient syngas (ES, H 2 + CO) fraction in an entrained flow coal gasification is very important to the stable operations of some downstream applications. This study presents the details about the robust optimization of the ES fraction in a typical entrained flow coal gasification, Shell coal gasification process (SCGP).
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