Heat of reaction measurements for hydrothermal carbonization of biomass

Funke, Axel; Ziegler, Felix

doi:10.1016/j.biortech.2011.05.016

Cited by 104 publications

(83 citation statements)

References 13 publications

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“…The HTC method has usually been used for a wide range of biomass feedstocks [4][5][6][7][8][9][10][11], where the effect of temperature, residence (carbonization) time, and carbonization yields have been studied. In the case of sewage sludge, the hydrothermal carbonization process was not so widely investigated, but studies were largely focused on the properties of solid product, energy recovery rate, hydrochar yields and its combustion characteristic, and improved dewaterability of sludge.…”

Section: Introductionmentioning

confidence: 99%

A novel method of sewage sludge pre-treatment - HTC

Wilk

2016

E3S Web Conf.

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Abstract. The aim of the paper is to present a relatively new technology -hydrothermal carbonization (HTC) of municipal sewage sludge. The HTC process was conducted in a stainless steel, Zipperclave Stirred Reactor, with a volume of 1000 ml, equipped with a MagneDrive Agitator. The control panel provides a programme which regulates the heater temperature and mixer speed. The main parameters of the process were temperature (~200C), pressure (~1.5 MPa) and residence time (4, 7, 10, and 12 h). In order to understand the process, the physical, chemical, thermal, and structural characteristics of the solid product, hydrochar, was investigated. Therefore, the ultimate and proximate analyses, and HHV for raw material and obtained hydrochar are presented. The majority of carbon, of the initial present carbon, remained within hydrochar. TA analysis was used to detect the initial and final temperature for the combustion of raw material and hydrochar. This technique is very useful for predicting the combustion characteristics of carbonaceous material. When considering the use of hydrochar as a solid fuel, more energy can be derived from hydrochar than from e.g. incineration of waste, and its carbon emission should be less significant. Therefore, HTC can be an environmentally beneficial technique for the combustion process.

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Section: Introductionmentioning

confidence: 99%

A novel method of sewage sludge pre-treatment - HTC

Wilk

2016

E3S Web Conf.

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“…The advantage of biochar is also high homogeneity. All these acquired properties may be of significant conceptual advantage in energy recovery compared to incineration or gasification of untreated biomass Rillig et al 2010;Funke, Ziegler 2011).…”

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Hydrothermal carbonization of stabilized sludge and meat and bone meal

Malaťák¹,

Dlabaja²

2015

Res. Agric. Eng.

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Malaťák J., Dlabaja T. (2015): Hydrothermal carbonization of stabilized sludge and meat and bone meal. Res. Agr. Eng., 61: 21-28.Hydrothermal carbonization is one of suitable methods for energy recovery of sewage sludge and meat and bone meal. The task of the article is to determine appropriate hydrothermal carbonization process conditions and their impact on the quality of the final product -so called biochar or hydrochar. Parameters of the two main phases -initiation and polymerization -were monitored. The basic fuel properties of the final solid products of hydrothermal carbonization were determined. To produce biochar by hydrothermal carbonization, multifunctional pressure vessel with accessories was used -a batch reactor BR-300. Process parameters of hydrothermal carbonization confirm the effect of increasing temperature to increase the lower heating value (LHV). Neither calorific values of meat and bone meal (17.22 MJ/kg), nor calorific values of digested stabilized sludge (12.14 MJ/kg) showed a significant increase after undergoing processing. The effect of reaction temperature on the LHV of the final product is significantly higher than that of residence time. The results show that the main factor affecting LHV of the fuel sample is the final amount of ash. Unlike the meat and bone the hydrothermal carbonization of the stabilized wastewater sludge is one of the effective processing methods for subsequent energy use.

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“…Here the LHV has almost doubled mainly thanks to reduction in oxygen content. Decrease of oxygen led to both higher HHV and LHV of the sample (Funke, Ziegler 2011). Res.…”

Section: Final Form Of the Reaction Productsmentioning

confidence: 92%

“…For these reasons the ideal material for hydrothermal carbonization is considered plant biomass with high moisture content where high heating value can be achieved without the need for expensive drying (Funke, Ziegler 2011). The resultant biochar can be used energetically or as a material possibly after further treatment as a soil amendment, adsorbent etc.…”

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Mass yield of biochar from hydrothermal carbonization of sucrose

Velebil¹,

Malaťák²,

Bradna³

2016

Res. Agric. Eng.

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In this article, the effect of increasing dry matter content and reaction time of hydrothermal carbonization on mass yield of biochar was studied. Carbonization took place in batch experiments in a pressure vessel. Results have confirmed the assumption that the mass yield of biochar would increase with growing dry matter content in the initial solution and also with reaction time at reaction temperature of 200°C. It was found that components of the liquid product that remain in the biochar have a measurable impact on its mass yield. Mixing of the reactor proved to have a considerable effect on the mass yield as well. Biochar produced in absence of mixing had higher pore volume and higher yield. This was evident even after subtracting the equivalent liquid phase dry matter in the biochar after drying.

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Heat of reaction measurements for hydrothermal carbonization of biomass

Cited by 104 publications

References 13 publications

A novel method of sewage sludge pre-treatment - HTC

A novel method of sewage sludge pre-treatment - HTC

Hydrothermal carbonization of stabilized sludge and meat and bone meal

Mass yield of biochar from hydrothermal carbonization of sucrose

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