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 ...
In this work, the technoeconomic and exergy analyses of two gasification technologies with integration into heat and power combined cycles are presented: i). Circulating fluidized bed (CFB) and ii). Dual fluidized bed (DFB) systems. As feedstock, lignocellulosic biomass (sugarcane bagasse, SCB) was considered. The gasification process of the fluidizedbed systems (circulating and dual bed ...
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 ...
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 ...
The present research work proposes an optimization procedure using Taguchi method and utility concept with the main objective of maximizing the calorific value of syngas with lower CO 2 yield during coal gasification process using thermodynamic equilibrium model based on stoichiometric approach. After validating the model with experimental results, the effect of air supply and steam supply on ...
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.
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 process flowsheet of the coal gasification process in a downdraft fixedbed gasifier using air as an oxidant is shown in Figure 1. The ... In order to provide the performance data of the integrated Biomass to Liq. system and future process optimization, a comprehensive model of the downdraft biomass gasification process based on Aspen Plus ...
Gasification agents with different oxygen concentrations directly affect the temperature of the gasification area, while the UCG process is a selfheat balance process [20]. The heat generated by combustion is conducive to establishing the ideal temperature field of the underground gasifier and leads to a reduction reaction and decomposition ...
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 ...
Nexant completed the first two tasks (Tasks 1 and 2) of the ''Gasification Plant Cost and Performance Optimization Study'' for the DOE's National Energy Technology Laboratory (NETL) in 2003. These tasks evaluated the use of the EGAS {trademark} gasification technology (now owned by ConocoPhillips) for the production of power either alone or ...
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 ...
This study proposed a twostage gasification (TSG) process of pulverized coal to allow for hydrogenrich (HR) production. The balance flow of this process is constructed using Aspen Plus software. Gasification pressure (GP), steamcoal ratio (SCR), and oxygencoal ratio (OCR) influences on the process are studied, and the operating conditions are optimized to achieve the maximum hydrogen ...
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
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 ...
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
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.
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 ...
(3) Multiobjective optimization of the coal gasification process using the genetic algorithm to obtain the optimal solution. 2 Model and mathematical method K Gasification model Firstly, the coal gasification model is established. The gasification model is shown in, in which the corresponding model selected by each module in ...
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".
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.
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 ...
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.
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 ...
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 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.
Biomass gasification is an attractive technology and one of the pathways for producing hydrogen. Due to the variable seasons and low calorific value of biomass, the addition of coal in the gasifier is suggested because coal has a high calorific value and carbontohydrogen ratio. In general, the gaseous product obtained in gasification always contains a high amount of carbon dioxide, therefore ...
Coal Gasification. Nicola J. Wagner, ... van Dyk, in Applied Coal Petrology, 2008 Publisher Summary. This chapter deals with coal gasification, which is a process that converts carbonaceous materials, such as coal, petroleum, petroleum coke, or biomass, into carbon monoxide and gasification as a powergeneration technology is gaining popularity due to the ready global ...
Keywords: Mini g, Gasification, Pr cess control, Process optimization, Real time optimization. ï€ 1. INTRODUCTION Coal is the most abundant and widespread type of fossil fuel, with reserves of economically recoverable coal estimated to be about 900 gigatons (GT), 64% of major fossil fuels. ... Ji, P., Gao, X., Huang, D., and Yang, Y. (2013 ...
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 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 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 ...
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.
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 ...
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