scholarly journals Preliminary design of optimized heat integrated two-stage vacuum evaporation for processing digestate from biogas plant

2020 ◽  
Vol 24 (6 Part A) ◽  
pp. 3637-3648
Author(s):  
Zorka Novak-Pintaric ◽  
Milos Bogataj ◽  
Bojan Pahor ◽  
Marjana Simonic
Keyword(s):  
Poultry Manure ◽  
Ammonia Solution ◽  
Vacuum Evaporation ◽  
Biogas Plant ◽  
Heat Integration ◽  
Flow Sheet ◽  
Preliminary Design ◽  
Evaporation Process ◽  
Two Stage ◽  
Evaporation Stage

This work presents a preliminary design of a two-stage vacuum evaporation process converting a diluted liquid digestate into concentrated liquid fertilizers. Di-gestate is produced in a 1 MW biogas plant during the anaerobic digestion of poultry manure and corn silage. Laboratory experiments showed that in the first evaporation stage, about three-quarters of input digestate can be stripped to a diluted ammonia solution, while the concentrate can be used as phospho-rus-potassium PK-fertilizer. After neutralization with H2SO4, the ammonium sulphate solution is concentrated in the second evaporation stage. Feasible operating temperatures that allow heat integration between the two stages were determined in a laboratory environment at 40 ?C for the first stage and 60 ?C for the second. A preliminary process flow sheet was simulated in Aspen Plus to obtain data for heat integration and optimization of industrial-scale processes. The process was completely integrated by using the waste hot utility available at the site, while the external utilities demand was virtually zero. Optimizing the flow rate of the added sulphuric acid improved overall economic performance. The optimization and heat integration of the two-stage vacuum evaporation process within a biogas plant resulted in a circular and economically viable waste management technology.

Production of grape pekmez by Ohmic heating-assisted vacuum evaporation

2021 ◽  
pp. 108201322199161
Author(s):  
Merve Tuçe Tunç ◽  
Arda Akdoğan ◽  
Cemalettin Baltacı ◽  
Zeliha Kaya ◽  
Halil İbrahim Odabaş
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Ohmic Heating ◽  
Vacuum Evaporation ◽  
Voltage Gradient ◽  
Evaporation Process ◽  
Significant Difference ◽  
Total Process ◽  
Energy Consumptions ◽  
Voltage Gradients

Pekmez is a concentrated syrup-like food conventionally produced by vacuum evaporation process from sugar-rich fruits. In this study, the applicability of grape pekmez production by ohmic heating assisted vacuum evaporation (ΩVE) method was investigated. Conventional vacuum evaporation (CVE) and ΩVE methods were compared in terms of physicochemical properties, HMF (5-hydroxymethylfurfural) contents, rheological properties, and energy consumptions. ΩVE was run at four different voltage gradients (17.5, 20, 22.5, and 25 V/cm). Total process times for grape pekmez production were determined as 57, 28.5, 32, 39, and 50 minutes for CVE, ΩVE (25 V/cm), ΩVE (22.5 V/cm), ΩVE (20 V/cm) and ΩVE (17.5 V/cm), respectively. Energy consumption of CVE method was higher than ΩVE method for all voltage gradients. Energy efficiency increased as the voltage gradient increased. There was no significant difference between CVE and ΩVE methods for HMF contents. The results show that the ΩVE method could be an alternative to the CVE process for grape pekmez production.

Waverider Aerodynamics and Preliminary Design for Two-Stage-to-Orbit Missions, Part 1

1998 ◽  
Vol 35 (4) ◽  
pp. 450-458 ◽  
Author(s):  
D. Strohmeyer ◽  
T. Eggers ◽  
M. Haupt
Keyword(s):  
Preliminary Design ◽  
Two Stage

Metal patterning using maskless vacuum evaporation process based on selective deposition of photochromic diarylethene

2008 ◽  
Vol 93 (21) ◽  
pp. 213304 ◽  
Author(s):  
Rie Takagi ◽  
Kyoko Masui ◽  
Shinichiro Nakamura ◽  
Tsuyoshi Tsujioka
Keyword(s):  
Vacuum Evaporation ◽  
Evaporation Process ◽  
Selective Deposition

scholarly journals Investigation of the Optimum Clocking Position in a Two-Stage Axial Turbine

2005 ◽  
Vol 2005 (3) ◽  
pp. 202-210 ◽  
Author(s):  
Dieter Bohn ◽  
Sabine Ausmeier ◽  
Jing Ren
Keyword(s):  
Flow Field ◽  
Unsteady Flow ◽  
Preliminary Design ◽  
Two Stage ◽  
Axial Turbine ◽  
Sliding Mesh ◽  
Field Distributions ◽  
Unsteady Simulation

A frozen rotor approach in a steady calculation and a sliding mesh approach in an unsteady simulation are performed in a stator clocking investigation. The clocking is executed on the second stator in a two-stage axial turbine over several circumferential positions. Flow field distributions as well as the estimated performances from two approaches are compared with each other. The optimum clocking positions are predicted based on the estimated efficiency from the two approaches. The consistence of the optimum clocking positions is discussed in the paper. The availability and the limit of the frozen rotor approach in predicting the optimum clocking position is analyzed. It is concluded that the frozen rotor approach is available to search the optimum clocking position in the preliminary design period, although it misses some features of the unsteady flow field in the multistage turbines.

scholarly journals Use of biogas biscuit meal EKPO-EB for agricultural biogas plant for substitution of energy crops utilization with organic waste

2015 ◽  
Vol 17 (3) ◽  
pp. 40-46
Author(s):  
Kateřina Chamrádová ◽  
Jiří Rusín
Keyword(s):  
Anaerobic Digestion ◽  
Laboratory Experiment ◽  
Methane Production ◽  
Organic Waste ◽  
Dry Mass ◽  
Corn Silage ◽  
Biogas Plant ◽  
High Yield ◽  
Two Stage ◽  
Second Stage

Abstract A laboratory experiment of two-stage mesophilic, low-dry mass, anaerobic digestion was carried out, focused on verifying the benefit of processing the biscuit meal EKPO-EB instead of triticale silage Agostino (GPS) and corn silage LG3266 in a regular batch for the agricultural biogas station in Pustějov. While anaerobic digestion of ensilages is largely difficult due to the content of lignocellulose, biscuit meal provides a high yield of biogas or methane, respectively, thanks to its high content of simple saccharides and lipids. When the original GPS (or the replacement EKPO-EB, respectively) represented 0.81% of weight of the daily input mixture dose for the first stage, the rise in volumetric methane production was 20% which is significant. The biscuit meal EKPO-EB decomposes almost completely in the first stage. Later, when the EKPO-EB represented 1.63% of weight of the daily input mixture dose for the first stage, the rise in volumetric methane production was 54% in the first stage and 16% in the second stage.

scholarly journals The chemical composition of the solid fraction products biogas plant, OOO "NPO "Agrobiogaz"

2018 ◽  
Vol 12 (4) ◽  
pp. 5-7
Author(s):  
Олег Васильев ◽  
Oleg Vasil'ev ◽  
Дмитрий Кирьянов ◽  
Dmitriy Kir'yanov
Keyword(s):  
Heavy Metals ◽  
Chemical Composition ◽  
Total Nitrogen ◽  
Total Phosphorus ◽  
Solid Fraction ◽  
Poultry Manure ◽  
Scientific Research ◽  
Biogas Plant ◽  
Natural Substance ◽  
Total Potassium

The article describes the results of scientific research on the study of chemical composition of solid products of poultry manure processing in a biogas plant LLC “NPO “Agrobiogaz”, St. Petersburg. Biofertilizer has the structure of semi-decomposed peat, it disperses well, has a faint smell of manure. 1 ton of natural substance contains, an average, 16.5 kilogram per ton of total nitrogen, 20 kilogram per ton of total phosphorus, and about 16 kilogram per ton of total potassium, as well as microelements. The content of heavy metals within the requirements; there are no traces of pesticides.

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