scholarly journals Improving the efficiency of cleaning gas emissions from foundry

2020 ◽  
Vol 35 ◽  
pp. 21-25
Author(s):  
Y. Burda ◽  
A. Cherednik ◽  
I. Redko ◽  
Y. Pivnenko
Keyword(s):  
Carbon Dioxide ◽  
Direct Action ◽  
Carbon Dioxide Concentration ◽  
Coke Oven ◽  
Measurement Range ◽  
Cleaning Process ◽  
Gas Cleaning ◽  
Term Operation ◽  
Carbon Dioxide Gas ◽  
Wet Gas

The work is devoted to the topical problem of increasing the efficiency of cleaning process of gases in packed-type scrubbers in order to reduce emissions of harmful substances and solid impurities into the atmosphere and improve the technical and economic indicators of wet gas cleaning systems. For this, a triangular cross-cut packing has been developed. Due to the size of the holes and their specific shape, the triangular packing provides longer contact of the packaging with water, which reduces water consumption. The packing is made of alloy steel AISI 316, so it can be used even in the most aggressive environment. In the work, the efficiency of cleaning with a scrubber with this packing is experimentally determined. The tests were performed at an ambient temperature of 23 °C. Several measurements were made for each type of packing, in a typical scrubber design. To conduct these industrial tests, a thermohygrometer-carbon dioxide gas analyzerAZ-7797 was used with high-precision NDIR (infrared) sensor, automatic background calibration (W/ABC), and compensation for deviations during long-term operation. The concentration measurement range is 0-9999 ppm with an error of ± 5 %. The gases were cooled in two stages. At first, they were cooled with ammonia water from 750 to 80 °C. Then they were fed to a primary gas refrigerator (basic type) of direct action, where its temperature were falled to 15 °C. Carbon dioxide concentration was measured after the first stage of cooling, after the final cooling, and after the cleaning process. The comparison is carried out with the most effective types of packing for wet gas cleaning today – chordal wood and Raschig rings. It is shown that the developed triangular packing with cross-shaped notches during the purification of coke oven gas from carbon dioxide improves the purification by 25 % in comparison with the wooden chord one, and by 15 % - with Raschig rings. This allows us to recommend it for widespread implementation.

The Waste Handling System of the Waste Disposal Department of the City of Zurich (Abfuhrwesen Zurich)

1995 ◽  
Vol 209 (3) ◽  
pp. 233-241
Author(s):  
M Lemann
Keyword(s):  
District Heating ◽  
Waste Incineration ◽  
Heating System ◽  
Cleaning Process ◽  
District Heating System ◽  
Handling System ◽  
Gas Cleaning ◽  
Wet Gas ◽  
Waste Handling ◽  
The City

This paper outlines the system used by the authorities in Zurich to treat and recycle waste in an environmentally acceptable way. The waste incineration system produces power and incorporates a district heating system as well as a wet gas-cleaning process.

scholarly journals THE PLANNING AND DESIGN OF KAMPONG PAKUNCEN IN YOGYAKARTA BASED ON THE GREEN CONCEPT

2019 ◽  
Vol 43 (1) ◽  
pp. 21-35 ◽  
Author(s):  
Erni Setyowati ◽  
Septana Bagus Pribadi ◽  
Subrata Aditama K. Aidon Uda ◽  
Tiara Rizkyvea Debby ◽  
Bangun I. R. Harsritanto
Keyword(s):  
Carbon Dioxide ◽  
Renewable Energy ◽  
Carbon Footprint ◽  
Building Materials ◽  
Comparative Method ◽  
Carbon Dioxide Concentration ◽  
Daily Activities ◽  
City Centre ◽  
Hydro Power ◽  
Carbon Dioxide Gas

This study aims to determine the green concept of a slum “kampong” with the green concept and carbon footprint approach based on daily activities, building materials and fuel consumption as well as to deliver the concept of renewable energy. The carbon footprint is the measure of total amount of carbon dioxide gas emissions directly or indirectly caused by daily main activities and accumulation of products used daily. It is the case study of Kampong Gampingan-Pakuncen, Yogyakarta. This kampong is known as a densely populated kampong located in the city centre not far from Malioboro, the centre of commercial and business districts in Yogyakarta City. The employed methods were the quantitative-comparative method between carbon footprint of existing and planning condition and the quantitative approach of renewable energy. The results showed that the carbon dioxide concentration of Kampong Pakuncen in the existing condition is 1,712.767 tonnes CO2/month while the total amount of carbon dioxide concentration of the design is 1,293.785 tonnes CO2/month, hence 24.462% carbon dioxide concentration reduction. To save energy consumption in daily activities, it is proposed that water wheel as micro-hydro power should be used for electricity.

scholarly journals Improving the Efficiency of the Wet Gas Cleaning Process in a Venturi Tube by Superposition of Ultrasonic Fields

2019 ◽  
Vol 25 (4) ◽  
pp. 580-588
Author(s):  
V. N. Khmelev ◽  
◽  
A. V. Shalunov ◽  
V. A. Nesterov ◽  
A. C. Bochenkov ◽  
...  
Keyword(s):  
Venturi Tube ◽  
Cleaning Process ◽  
Gas Cleaning ◽  
Ultrasonic Fields ◽  
Wet Gas

scholarly journals The flow path characteristics analysis for supercritical carbon dioxide gas turbines

2019 ◽  
Vol 124 ◽  
pp. 01006
Author(s):  
A. N. Rogalev ◽  
N. D. Rogalev ◽  
V. O. Kindra ◽  
E. Y. Grigoriev ◽  
B. A. Makhmutov
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Gas Turbines ◽  
Velocity Ratio ◽  
Carbon Dioxide Concentration ◽  
Flow Path ◽  
Working Fluid ◽  
Carbon Dioxide Gas ◽  
Reaction Degree ◽  
Supercritical Carbon

Rising carbon dioxide concentration in the atmosphere is probably the main reason of global warming. The development of the oxy-fuel combustion cycles is a possible way to decrease the energy sector contribution in the emission process. However, an unusual composition and thermodynamic parameters of the working fluid cause the necessity of revision of the main equipment characteristics, especially for the supercritical carbon dioxide gas turbine. This study presents the method and the results of the flow path preliminary analysis for the new generation gas turbines working on carbon dioxide. The flow path shape with a constant root diameter of seven stages was chosen as the most reasonable due to cheap manufacturing. Influence of reaction degree of stages and velocity ratio on stage geometric parameters are revealed. It was found that the optimal reaction degree and velocity ratio are equal to 0.25 and 0.36 correspondingly. Thermal and constructive stages characteristics of the 350 MW turbine are determined.

scholarly journals Near Infrared Sensor to Determine Carbon Dioxide Gas Based on Ionic Liquid

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 163
Author(s):  
María Dolores Fernández-Ramos ◽  
Fátima Mirza-Montoro ◽  
Luis Fermín Capitán-Vallvey ◽  
Isabel María Pérez de Vargas-Sansalvador
Keyword(s):  
Carbon Dioxide ◽  
Ionic Liquid ◽  
Near Infrared ◽  
Measurement Range ◽  
Ph Indicator ◽  
Carbon Dioxide Gas ◽  
Recovery Times ◽  
Filter Process ◽  
Response And Recovery ◽  
Sensing Membrane

In this study we present an NIR carbon dioxide gas sensor based on an inner filter process that includes an ionic liquid (IL), 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF4), to improve its stability, dynamic behavior and lifetime, which are usually the main drawbacks with these sensors. The presence of CO2 causes a displacement of a simple boron-dipyrromethene-type fluorophore, azaBODIPY, as the pH indicator towards its acid form. This increases the emission intensity of Cr(III)-doped gadolinium aluminium borate (GAB) as the luminophore. The characterization of the prepared sensor was carried out and a discussion of the results is presented. The response and recovery times improved considerably, 23 and 49 s, respectively, with respect to the sensor without IL, at 60 and 120 s, respectively,. Additionally, the measurement range is extended when using IL, able in this case to measure in the complete range up to 100% CO2; without IL the measurement range is limited to 60% CO2. The detection limit ranges from 0.57% CO2 without IL to 0.26% CO2 when IL is added. The useful lifetime of the sensing membrane was 20 days for membranes with IL and only 6 days for membranes without IL, with the sensor always kept in the dark and without the need to maintain a special atmosphere.

The Role of the Ocean Carbon Cycle in Climate Change

2014 ◽  
Vol 22 (1) ◽  
pp. 97-105
Author(s):  
Christoph Heinze
Keyword(s):  
Climate Change ◽  
Carbon Dioxide ◽  
Carbon Cycle ◽  
Sea Water ◽  
Heat Budget ◽  
Carbon Dioxide Concentration ◽  
Turnover Time ◽  
Ocean Carbon Cycle ◽  
Carbon Dioxide Gas ◽  
Ocean Carbon

The ocean carbon cycle plays a twofold role in the context of climate change: (1) through carbon dioxide gas exchange with the atmosphere and carbon cycle climate feedbacks, the ocean regulates the carbon dioxide concentration in the atmosphere and hence has a strong influence on the heat budget of the Earth; (2) the paleo-climatic marine sediment core record is largely based on biogenic matter fluxes from the ocean surface to the sea floor, which are part of the marine carbon cycle. The ocean is important for global carbon cycling, primarily due to three factors: (1) the ocean is a huge carbon reservoir with a relatively short turnover time; (2) carbon dioxide in sea water is effectively dissociated inorganically into other substances; (3) marine plankton is keeping the surface ocean carbon dioxide concentration at a lower level than would a lifeless ocean. On intermediate to long time scales, the ocean provides the most important sink for anthropogenic carbon dioxide. The marine uptake kinetics for carbon dioxide work on a longer time scale than current and projected emissions by humans.

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