scholarly journals Analysis of Heat Balance of MH Separator

2020 ◽  
Vol 328 ◽  
pp. 03014
Author(s):  
Lukáš Tóth ◽  
Tomáš Brestovič ◽  
Natália Jasminská ◽  
Marián Lázár
Keyword(s):  
Metal Hydride ◽  
Heat Balance ◽  
Plasma Reactor ◽  
Hydrogen Separation ◽  
Thermal Balance ◽  
Equipment Operation ◽  
Gasification Process ◽  
Heating And Cooling ◽  
Synthetic Gas ◽  
Waste Gasification

The paper deals with the thermal balance of a metal hydride separator, primarily a tank containing a metal hydride alloy subjected to heating and cooling processes caused by absorption and desorption. As during the equipment operation it is necessary to ensure heating and cooling, the amount of the required heat to be supplied and removed must be identified. The article also deals with hydrogen separation from undesired components of synthetic gas which is formed in a plasma reactor during the waste gasification process.

scholarly journals Analysis of the Heat Balance of a Metal Hydride Separator Used for the Separation of Hydrogen from Syngas

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 251
Author(s):  
Tomáš Brestovič ◽  
Marián Lázár ◽  
Natália Jasminská ◽  
Jozef Živčák ◽  
Lukáš Tóth ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Metal Hydride ◽  
Heat Balance ◽  
Alloy Powder ◽  
Hydrogen Absorption ◽  
Heat Removal ◽  
Hydrogen Separation ◽  
Thermal Recovery ◽  
Field Homogeneity

The present article discusses the potential for hydrogen separation using a metal hydride separator, which facilitates the generation of hydrogen contained in syngas following the thermal recovery of wastes. The article provides a detailed description of the separator heat balance using analytical calculations and optimised calculations, and by applying numerical methods. The proposed concept of a separator intended for hydrogen separation from syngas offers a solution to a problem associated with the use of metal hydride alloy powders; in particular, their low thermal conductivity. In order to eliminate big temperature differences in the alloy, a heat transfer intensifier was implemented in the metal hydride alloy volume; the intensifier was made of metal and exhibited high thermal conductivity. For the purpose of comparing the thermal fields, the first stage comprised the creation of a numerical simulation of hydrogen absorption without the use of an intensifier. Subsequently, three different geometries were created for an intensifier intended to remove heat from the metal hydride alloy powder towards the separator cover, and the effects of these three geometries were analysed. The implementation of heat transfer intensifiers into the metal hydride alloy powder improved the heat removal by as much as 43.9% and increased the thermal field homogeneity by 77%. A result of the heat removal optimisation was an increase in the hydrogen absorption kinetics and the efficiency of the separator operation.

scholarly journals Possibilities of utilization of waste heat of synthesis gas

2020 ◽  
Vol 8 (1) ◽  
pp. 32-36
Author(s):  
Lubica Bednarova ◽  
Lukáš Tóth ◽  
Tomáš Brestovič ◽  
Natália Jasminská ◽  
Marián Lázár ◽  
...  
Keyword(s):  
Fuel Cells ◽  
High Temperatures ◽  
Synthesis Gas ◽  
Metal Hydride ◽  
Waste Heat ◽  
Plasma Reactor ◽  
Hydrogen Separation ◽  
Thermal Recovery ◽  
Gas Mixture ◽  
Recovery Potential

The paper discusses possibilities of energetic utilization of waste heat from synthesis gas, which worsens possibilities of its further utilization. In this case, it is the recovery of synthesis gas with a high proportion of hydrogen produced by the thermal recovery of municipal waste by means of a plasma reactor. High temperatures deteriorate its recovery potential by separating hydrogen from the gas mixture and its subsequent use in fuel cells. Hydrogen separation takes place in the plant using metal hydride materials.

Development of a Heat-Balance Model for a Fluidized Bed Waste Gasification Furnace

2004 ◽  
Vol 30 (4) ◽  
pp. 447-454
Author(s):  
Takahiro MARUMOTO ◽  
Naoki FUJIWARA ◽  
Noriyuki OHYATSU ◽  
Tetsuya IWASE
Keyword(s):  
Fluidized Bed ◽  
Heat Balance ◽  
Balance Model ◽  
Waste Gasification

scholarly journals Formation of Incrustations during the Cocombustion of Biomass in Fluidised Bed Boilers

2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
Petr Buryan
Keyword(s):  
Raw Materials ◽  
Combustion Process ◽  
Power Equipment ◽  
Fluidised Bed ◽  
Boiler Furnace ◽  
Repeated Heating ◽  
Equipment Operation ◽  
Heating And Cooling ◽  
First Pass ◽  
Pass Through

In this article, we focus on causes of formation of incrustations in fluidised bed boilers that result from combustion of biomass-containing energy-producing raw materials and can significantly limit the efficiency of the respective power equipment operation. We applied laboratory procedures followed for assessment of characteristic eutectics of mixtures of coal ashes, desulphurisation components (dolomite and limestone), and woodchip ashes. Our analysis proved that combustion of these (or similar) raw materials, accompanied by repeated heating and cooling of combustion and flue gas desulphurisation products, leads to the formation of unfavourable incrustations. These incrustations can grow up to several tens of centimetres in size, thereby significantly restricting the power equipment functionality. They arise due to incrust reheating that results in the formation of eutectics, which have lower melting temperatures than that during their first pass through the combustion process. The same holds for desulphuriation components themselves. Formation of these new eutectics can be attributed both to recycling of substances produced during the first pass through the furnace as well as to mixtures formed both from recycled materials and from components initially combusted in the boiler furnace.

Effect of Na and K on Gas Production during the Simulated Municipal Waste Gasification Process

2013 ◽  
Vol 27 (9) ◽  
pp. 5307-5312 ◽  
Author(s):  
Chiou-Liang Lin ◽  
Tzu-Huan Peng ◽  
Hsien Chen
Keyword(s):  
Gas Production ◽  
Municipal Waste ◽  
Gasification Process ◽  
Waste Gasification

The Effect of Biomass Contents with Heavy Metal on Gasification Efficiency during Fluidized Bed Gasification Process

2012 ◽  
Vol 512-515 ◽  
pp. 575-578
Author(s):  
Hsien Chen ◽  
Chiou Liang Lin ◽  
Wun Yue Zeng ◽  
Zi Bin Xu
Keyword(s):  
H2 Production ◽  
Heating Value ◽  
Gasification Process ◽  
Cold Gas Efficiency ◽  
Zn Concentration ◽  
Lower Heating Value ◽  
Gasification Efficiency ◽  
Waste Gasification ◽  
Gas Efficiency ◽  
Cu And Zn

Catalysis was used to increase the H2 production, syngas heating value, enhanced carbon conversion efficiency and cold gas efficiency during gasification. Due to Cu and Zn were abundant in waste according to previous researches, this research discussed the effect of Cu and Zn on artificial waste gasification. The syngas composition and total lower heating value (LHV) were determined in this study. The results showed that the existence of Cu and Zn increased production of H2 and CO. However, the production of CH4 and CO2 decreased. At same time, total LHV was also increased. Additionally, the different Cu concentration affected gas composition and LHV, but the effect of Zn concentration was not significant.

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