Simulation on co-gasification of bituminous coal and industrial sludge in a downdraft fixed bed gasifier coupling with sensible heat recovery, and potential application in sludge-to-energy

Energy ◽  
2021 ◽  
pp. 123052
Author(s):  
Wenqi Zhang ◽  
Jianbiao Chen ◽  
Hua Fang ◽  
Guoxu Zhang ◽  
Zhibing Zhu ◽  
...  
Keyword(s):  
Potential Application ◽  
Heat Recovery ◽  
Bituminous Coal ◽  
Fixed Bed ◽  
Sensible Heat ◽  
Industrial Sludge ◽  
Downdraft Fixed Bed

EFFECT OF CONDENSATION ON THE EFFICIENCY OF HEAT RECOVERY VENTILATORS FOR BROILER HOUSES

2013 ◽  
Vol 21 (02) ◽  
pp. 1350009 ◽  
Author(s):  
HWATAIK HAN ◽  
SANG-HOON NAM ◽  
GEON-SOO HAN
Keyword(s):  
Heat Exchanger ◽  
Relative Humidity ◽  
Latent Heat ◽  
Heat Recovery ◽  
Harsh Environments ◽  
Sensible Heat ◽  
Outdoor Temperature ◽  
Toxic Gases ◽  
Temperature Efficiency ◽  
Plate Type

This study experimentally investigates the effect of internal condensation on the performance of a heat recovery ventilator. Experiments were performed using a plate-type sensible heat exchanger element that was designed for very humid and dusty environments such as chicken broiler houses. The results of these experiments show that the temperature efficiency considering condensation is always greater than that without considering latent heat. As outdoor temperature decreases or indoor relative humidity increases, temperature efficiency increases owing to an increase in the rate of condensation. The present polypropylene-based sensible heat exchanger element could be a solution for harsh environments because it can discharge condensate water by gravity and is resistant to moisture and other toxic gases.

scholarly journals Possibility of Slag Sensible Heat Recovery on Drum-like Installations

2020 ◽  
Author(s):  
Yu.V. Sorokin ◽  
B.L. Demin ◽  
L.A. Smirnov ◽  
Ye.N. Shcherbakov
Keyword(s):  
High Temperature ◽  
Heat Recovery ◽  
Heat Content ◽  
Sensible Heat ◽  
Energy Characteristics ◽  
Working Bodies ◽  
Physical Heat

A variant of utilizing of slag physical heat in drum-like installations has been considered. A high-temperature melt is delivered to movable metal bodies. Heat is picked up from the working bodies surface and newly generated surfaces of slag due to interaction with working bodies. Surface of slag grains, as they cool down, allows to pick up heat with various energy characteristics. Keywords: smelter slags, heat content, drum-like installations, picking up and utilization of heat with various energy characteristics

scholarly journals Solid Biomass to Medium CV Gas Conversion With Rich Combustion

2019 ◽  
Author(s):  
Gordon E. Andrews ◽  
Aysha Irshad ◽  
Herodotus N. Phylaktou ◽  
Bernard M. Gibbs
Keyword(s):  
Cone Calorimeter ◽  
Fixed Bed ◽  
Radiant Heat ◽  
Exhaust Gas ◽  
Sensible Heat ◽  
Gas Temperature ◽  
Heated Sample ◽  
Fuel Feed ◽  
The Rich ◽  
Solid Biomass

Abstract A modified cone calorimeter for controlled atmosphere combustion was used to investigate the gases released from fixed bed rich combustion of solid biomass. The cone calorimeter was used with 50 kW/m2 of radiant heat that simulated a larger gasification system. The test specimen in the cone calorimeter is 100mm square and this sits on a load cell so that the mass burn rate can be determined. Pine wood was burned with fixed air ventilation that created rich combustion at 1.5–4 equivalence ratio, Ø. The raw exhaust gas was sampled using a multi-hole gas sample probe in a discharge chimney above the cone heater, connected via heated sample lines, filters and pumps to the heated Gasmet FTIR. The FTIR was calibrated for 60 species, including 40+ hydrocarbons. The hydrogen in the gas was computed from the measured CO concentration using the water-gas shift reaction. The exhaust gas temperature was also measured so that the sensible heat from the gasification zone was included in the energy balance. The GCV of the pine was 18.8 MJ/kgpine and at the optimum Ø the energy in the rich combustion zone gases was 14.5 MJ/kgpine, which is a 77% energy conversion from solid biomass to a gaseous fuel feed for potential gas turbine applications. This conversion efficiency is comparable with the best conventional gasification of biomass and higher than most published conversion efficiencies for coal gasifiers. Of the energy in the gas from the rich combustion 35% was from the CO, 20% from hydrogen, 35% from hydrocarbons and 10% sensible heat. Ash remained in the rich burning gasification zone. As the biomass is a carbon neutral fuel there is no need to convert the gasified gases to hydrogen, with the associated energy losses.

scholarly journals Energy Recovery from an Industrial Clothes Dryer Using a Condensing Heat Exchanger

2021 ◽  
Author(s):  
Yousuf Farooq
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Heat Exchanger ◽  
Heat Recovery ◽  
Cold Water ◽  
Waste Heat ◽  
Interface Temperature ◽  
Sensible Heat ◽  
Clothes Dryer ◽  
Condensing Heat Exchanger

The aim of this project was to design a condensing heat exchanger to recover waste heat from an industrial clothes dryer. Industrial cloth dryers are inefficient in their use of energy because almost all of the energy input in the dryer is wasted in the atmosphere, and thus there is great potential for heat recovery. This energy can be used to preheat the incoming cold water, and the conventional heater can then heat the water to a final temperature. The warm moist air from the dryer carries both sensible and latent heat, and in order to design this heat recovery condensing heat exchanger, the heat transfer by both mass and sensible heat has to be accounted for. The basis of this heat and mass transfer problem was the energy balance at the interface, and separate models for the calculation of latent and sensible heat transfer were used. The mass transfer coefficients were obtained from an analogy with heat transfer, and the unknown interface temperature was solved for iteratively. The data for this design was collected from a 20 kW dryer, and the heat recovery from that dryer was observed to be about 17.3%. This heat recovery condensing heat exchanger efficiency can be enhanced by the addition of more coils to the heat exchanger. An improvement in the overall results can be expected if a practical study is done on the condensation heat exchanger for an industrial cloth dryer.

Comparative Analysis Between Different Configurations in a Biomass Gasifier and a Genset for Electrical Energy Production

2020 ◽  
Vol 142 (7) ◽  
Author(s):  
Jandemarques Alexandre Soares da Silva ◽  
Francisco Everton Tavares de Luna ◽  
Vicente de Vasconcelos Claudino Filho ◽  
Merques do Nascimento Freitas
Keyword(s):  
Diesel Engine ◽  
Electric Power ◽  
Fixed Bed ◽  
Reactor Core ◽  
Electrical Energy ◽  
Supply Pipe ◽  
Ash Deposit ◽  
Flow Through ◽  
Downdraft Fixed Bed ◽  
Electrical Energy Production

Abstract The effect of different gensets coupled to a downdraft, fixed bed gasifier was investigated, pruning residue from five different tree species was used. This gasifier was designed to power a dual (produced gas/diesel) engine, with a maximum power electric generation of 20 kWe. This engine was first replaced by a four-cylinder engine, and later by a six-cylinder diesel engine, which underwent a conversion process for the Otto cycle; it was thus possible to operate the genset only with produced gas. This modification allowed an increase in the produced electric power from 20 kWe to 32 kWe. To operate this engine only with the produced gas, without harming its capacity to generate electric power, it required many modifications, as an increase in motor supply pipe diameter. Also, due to excessive accumulation of ash on the grate that separates the reactor core from the ash deposit, a mechanical system that clears this grate has been installed. This device allows gases produced in the gasification to have a continuous flow through the grate, being manually operated whenever required. In order to evaluate the viability of this new set gasifier/genset, some parameters such as consumption, power output, and system efficiency were studied, and a comparison was made with the data generated by works previously done by the same laboratory team and using the same gasifier.

scholarly journals Development of a Chemical Equilibrium Model of the Downdraft Fixed Bed Gasification Process with known Product Temperature, Using air as an Oxidizing Agent

2020 ◽  
Vol 24 (1) ◽  
Author(s):  
Daniel Andres Quintero-Coronel ◽  
Edwin Edgardo Espinel-Blanco ◽  
Eder Norberto Flórez-Solano
Keyword(s):  
Chemical Equilibrium ◽  
Equilibrium Model ◽  
Fixed Bed ◽  
Palm Kernel ◽  
Outlet Temperature ◽  
Reaction Products ◽  
Gasification Process ◽  
Downdraft Fixed Bed ◽  
Gasification Reaction ◽  
Chemical Equilibrium Model

A chemical equilibrium model for known outlet temperature of the products was carried out on a downdraft fixed bed gasifier. Biomass from oil palm kernel is used with proximate and ultimate analysis; the general gasification reaction takes into account the biomass moisture, the reaction products are formed by CH4, H2O, N2, CO, CO2 and H2. The model is described in detail and the equations are solved using the EES software. The model shows the results obtained for temperature ranges from 500 K to 1500 K and 1.0 atm. The model is validated by direct comparison of the gas composition with the results reported in the literature for similar conditions, obtaining favorable results.

Rapid thermal swing adsorption process in multi-beds scale with sensible heat recovery for continuous energy-efficient CO2 capture

2020 ◽  
Vol 392 ◽  
pp. 123656 ◽  
Author(s):  
Wonho Jung ◽  
Sunghyun Park ◽  
Kwang Soon Lee ◽  
Jae-Deok Jeon ◽  
Hyung Keun Lee ◽  
...  
Keyword(s):  
Co2 Capture ◽  
Energy Efficient ◽  
Heat Recovery ◽  
Adsorption Process ◽  
Sensible Heat ◽  
Continuous Energy ◽  
Thermal Swing Adsorption

Study on Energy Saving of the Air-Conditioning Exhaust Heat Recovery System in Office Buildings

2015 ◽  
Vol 775 ◽  
pp. 44-49
Author(s):  
Yan Zou
Keyword(s):  
Thermal Performance ◽  
Heat Recovery ◽  
Sensible Heat ◽  
Humid Climate ◽  
Beijing Area ◽  
Heat Efficiency ◽  
Exhaust Heat ◽  
Recovery System ◽  
Heat Recovery System ◽  
Hot Humid Climate

The study analyzed the thermal performance of a sensible heat recovery system in an office building in Beijing area. Based on proposing the basic evaluation index of the thermal performance, the study analyzed the effect of outdoor temperature and wind speed on the heat recovery efficiency and the reduction of fresh air load. The analysis results show that, the operation effect of the sensible heat recovery device in winter is better. In winter, the sensible heat efficiency η is higher than 60%, the system has higher EER, and the fresh air load can be reduced more than 50%. While the sensible heat efficiency η is lower than 60% in most time in summer. And in a hot, humid climate, the recovery effect of sensible heat recovery device is significantly reduced.

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