Moreover, a composite LSTM model composed of models on different operating conditions, like steady-state and transient-state condition, is prosed. ... Dynamic modeling and optimization of a coal-fired utility boiler to forecast and minimize NOx and CO emissions simultaneously. Computers & Chemical Engineering 124:62–79. Article …

Since China's open-pit coal mines are mostly located in areas with dry geotechnical soils, lack of water resources, and regions with drought, coal dust can travel at wind speeds above 3–4 m/s. Fine particles such as PM 2.5 in coal dust do not settle easily, and can spread over hundreds of kilometers with wind (Tang and Cai, 2018). This ...

The multi-objective optimization strategy is used to optimize the molding pressure, average particle size, and binder ratio for maximization of the mechanical …

Therefore, it is a feasible way to improve the adsorption properties of products by the optimization of phase compositions during hydrothermal synthesis [30], [31]. In this work, one-step hydrothermal synthesis of zeolite-calcium silicate hydrate composite from coal fly ash was proposed based on the synergistic activation of Ca(OH) ...

Firstly, the central composite design (CCD) was used to obtain the optimization schemes, and the drag coefficient and pressure coefficient were proposed to evaluate the degree of flow field changes. Secondly, a series of computational fluid dynamics (CFD) simulations were performed to obtain the drag coefficient and pressure …

Stearic acid hybridizing coal–series kaolin composite phase change material for thermal energy storage. Applied clay science ... Likewise, temperature and pressure fluctuations vary product distribution. So that optimization must be done to illustrate the optimum conditions. It was obtained that maximum amount of alkenes and minimum …

From a mesoscopic perspective, coal is a complicated net-shaped force-bearing system. It is reasonable to simulate this complicated system by particles and parallel bonds among the particles. Based on this cognition, Particle Flow Code (PFC) has been developed. The model calibration is fundamental for effective simulation of crack …

Sarkar et al. (1960) suggested a graphical approach for maximization of yield of composite clean coal at a desired ash content. It was suggested that cleaning of coarser coal at a higher ash content and finer coal at a relatively lower ash content gives the maximum yield while satisfying the given product ash constraint.

Article ORIGINAL ARTICLE Published: 31 January 2023 Manufacturing and optimization of the effect of casting process parameters on the compressive strength of …

Finally, based on the orthogonal matrix analysis method of supporting parameters optimization of the top coal roadway in thick seam, the analysis amount of …

A fast and relatively accurate optimization method is urgently needed. In this study, a semi-analytical model of fracture propagation is established that couples stress interaction with fracture propagation using the energy balance principle, which can run a complete simulation process within 10 seconds. The simulation results show that the ...

The proportion of minerals in the coal gasification fine slag samples was obtained using X-ray diffraction (XRD) and the "k-value method." As shown in Fig. 1, the coal gasification fine slag mainly contains quartz, calcite, potassium feldspar, and plagioclase.There is a bulge peak in the range of 20–30°, indicating that the fine …

In this paper, composite based geopolymer prepared from coal gangue and blast furnace slag was used for the solidification of heavy metals in lead–zinc tailing …

Adding catkins into the Composite biomass pellets (CBPs) fuel to realize its utilization. • This work presents studies on the co-combustion of coal and CBP S in …

Wu et al. [84] synthesized a composite from zeolite and Al–Mn binary oxide for the adsorption of ammonium-nitrogen and phosphorus from water in a fixed-bed adsorption reactor. The maximum adsorption capacities of ammonium-nitrogen and phosphorus by the composite were found to be 12.9 and 9.3 mg g −1, respectively.

In view of the inclined occurrence of coal seam in Heishan open-pit coal mine, in the longitudinal exploitation process of the first mining area, the height of the slope at the west end is increasing, and the occurrence of weak interlayer in the slope is in production. The failure mechanism and stability of the end slope of the inclined …

Abstract and Figures. In this study, a coal washing plant in Zonguldak was optimized using equalization of incremental product quality approach which maximizes plant yield for a given ash ...

Heat transfer was found not to be limiting for the reduction reaction. An attempt has been made to study the effect of coal quality on the reduction kinetics of iron ore–coal composite pellets under non-isothermal condition in inert atmosphere by Sah and Dutta [16]. However, the comparison of the models is still relatively rare.

In order to optimize the Working bench length of inclined composite coal seam open pit mine, Through theoretical analysis and calculation, the relationship between different mining technology working bench and working face transport costs was studied, The influence of the length of the working bench on the stripping ratio of production and the mining with …

Taguchi optimization and modelling of stir casting process parameters on the percentage elongation of aluminium, pumice and carbonated coal composite | Scientific Reports Article Open Access...

Due to the burial characteristics of the extremely thick inclined coal seam, the exposed area of the end slope during mining will be different from that of the near-horizontal coal seam open pit (Figure 2).As mining proceeds, the vertical depth (H 1) at the toe of working slope and the vertical depth (H 2) at the toe of the inner dump increase, …

The central composite rotatable design (CCRD) was used to design an experimental program to provide data to model the effects of drum speed, tilt angle, wash water and feed solids on the performance of Multi-Gravity Separator treating coal from Yenicubuk/Turkey lignite coal containing approximately 36.1% ash.

value (19.0 MJ/kg), fuel ratio (1.85), and low sulfur content (<1%). The multi-objective optimization strategy is used to optimize the molding pressure, average particle size, and binder ratio for maximization of the mechanical performance indicators such as compressive strength and drop strength of biomass-blended coal composites.

In this paper, composite based geopolymer prepared from coal gangue and blast furnace slag was used for the solidification of heavy metals in lead–zinc tailing (LZT). The impact of various factors on compressive strength development in composite geopolymer was evaluated through response surface experiment. ... Optimization of …

Parameter optimization of waste coal briquetting and particulate matter emissions test during combustion: ... The composite binders of sodium humate and polyvinyl alcohol (PVA) were selected as they were effective in previous studies. The cold-pressing briquetting process was used to punch the upgraded coal. The relationship …

The coal was leached with HF at leaching temperature 65 °C and contact time 3 h, followed by HNO 3 in the same condition. The ash content of coal reduced from 7.9% to 2.6% and 67% demineralization was obtained by HF treatment alone and successive treatment of HF-treated coal with HNO 3.

Abstract and Figures. A coal preparation plant typically operates with multiple cleaning circuits to clean individual size fractions of run-of-mine coal. Coal preparation plants are traditionally ...

As a critical technical issue, gas extraction borehole sealing significantly restricts the effects of gas extraction. Polymer-modified cement-based composite (PMCC) sealing materials were developed to improve the sealing effect of gas extraction drilling. In this study, a self-built mechanical property and permeability test platform for grouting …

The two-layer cluster method divides data into several parts according to the coal feeder and air-coal ratio change rates. The data after segmentation is used to …

This study investigates the non-isothermal reduction of iron ore fines with two different carbon-bearing materials using the thermogravimetric technique. The iron ore fines/carbon composites were heated from room temperature up to 1100 °C with different heating rates (5, 10, 15, and 20 °C/min) under an argon atmosphere. The effect of …