scholarly journals The study on the heat recovery from air compressors

2018 ◽  
Vol 70 ◽  
pp. 03001 ◽  
Author(s):  
Mariusz Broniszewski ◽  
Sebastian Werle
Keyword(s):  
Heat Recovery ◽  
Waste Heat ◽  
Electricity Consumption ◽  
Heat Losses ◽  
Compressed Air ◽  
Production Plant ◽  
White Certificates ◽  
Air Compressors ◽  
Effective Use ◽  
Energy Regulatory

Effective use of utilities in production plants is an issue that is becoming increasingly significant in energy policy of Europe. Production of compressed air consumes 3% of the total electricity consumption in Europe. In order to produce compressed air, approximately 10-20% of electricity transferred to compressor is used, the rest is lost due to lack of tightness and heat losses. The aim of this work is to evaluate the possibility to install recovery systems on air compressors to recover the lost waste heat and its management for the needs of heating office buildings/production halls and analysis of investment profitability. The investment will be supported by co-financing in the form of energy efficiency certificates (so-called white certificates), which the production plant will be able to sell after receiving them from Polish Energy Regulatory Office in return for completing an investment that consists recovering waste heat from air compressors.

scholarly journals EFFECTIVE USE OF ROTARY FURNACE SHELL HEAT

2014 ◽  
Vol 54 (6) ◽  
pp. 414-419
Author(s):  
Julius Lisuch ◽  
Dusan Dorcak ◽  
Jan Spisak
Keyword(s):  
Waste Heat ◽  
Cooling System ◽  
Raw Materials ◽  
Significant Proportion ◽  
Rotary Furnace ◽  
Cost Effective ◽  
Total Energy Expenditure ◽  
Heat Losses ◽  
Controlled Cooling ◽  
Effective Use

<pre><pre>Significant proportion of the total energy expenditure for the heat treatment of raw materials are heat losses through the shell of rotary furnace. Currently, the waste heat is not used in any way and escapes into the environment. Controlled cooling system for rotary furnace shell (<span>CCSRF</span>) is a new solution integrated into the technological process aimed at reducing the heat loss of the furnace shell. Based on simulations and experiments carried out was demonstrated a significant effect of controlled cooling shell to the rotary furnace work. The proposed solution is cost-effective and operationally undemanding.</pre></pre>

scholarly journals METHODOLOGY FOR THE UTILIZATION OF WASTE HEAT BY AIR-COOLED COMPRESSORS

2021 ◽  
Vol 2021 (4) ◽  
pp. 4918-4923
Author(s):  
LUKAS PACAS ◽  
Keyword(s):  
Waste Heat ◽  
Cooling System ◽  
Combustion Engine ◽  
Electrical Energy ◽  
External Source ◽  
Compressed Air ◽  
Air Cooling ◽  
Hot Air ◽  
Air Compressors ◽  
Almost All

Compressed air is still a valid helper in many applications today, where it is necessary, for example, to move work equipment, pistons or it is used for cooling as a cooling medium. The producer of compressed air are air compressors, which need an external source for its production, usually an electric or internal combustion engine. Almost all the energy that is supplied to the compressor is always converted to heat during compression, regardless of the type of compressor. This carries the risk of overheating and therefore the cooling system must be optimally designed. Thus, during the compression of the air, a large part of the electrical energy supplied to the compressor is converted into heat, and only a small part of the supplied energy is in the compressed air. In the case of oil or water-cooled compressors, the exchangers can be used directly to obtain energy "for free". In the case of air cooling, a slight energy gain can only be achieved by modifying the exhaust hot air ducts. This energy can be used efficiently to heat water or heat buildings, instead of being uselessly ventilated. Modern compressors are already adapted for the use of waste heat, but most current companies still use older types of compressors that have not been directly adapted for the use of waste heat. In case of interest in obtaining waste heat, the reconstruction of the facility or development is inevitable.

scholarly journals Effects of Compression Ratio of Bio-Fueled SI Engines on the Thermal Balance and Waste Heat Recovery Potential

2021 ◽  
Vol 13 (11) ◽  
pp. 5921
Author(s):  
Ali Qasemian ◽  
Sina Jenabi Haghparast ◽  
Pouria Azarikhah ◽  
Meisam Babaie
Keyword(s):  
Numerical Model ◽  
Heat Loss ◽  
Compression Ratio ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Internal Combustion Engines ◽  
Waste Heat ◽  
Heat Losses ◽  
Maximum Efficiency ◽  
Si Engines

In internal combustion engines, a significant share of the fuel energy is wasted via the heat losses. This study aims to understand the heat losses and analyze the potential of the waste heat recovery when biofuels are used in SI engines. A numerical model is developed for a single-cylinder, four-stroke and air-cooled SI engine to carry out the waste heat recovery analysis. To verify the numerical solution, experiments are first conducted for the gasoline engine. Biofuels including pure ethanol (E100), E15 (15% ethanol) and E85 (85% ethanol) are then studied using the validated numerical model. Furthermore, the exhaust power to heat loss ratio (Q˙ex/Q˙ht) is investigated for different compression ratios, ethanol fuel content and engine speed to understand the exhaust losses potential in terms of the heat recovery. The results indicate that heat loss to brake power ratio (Q˙ht/W˙b) increases by the increment in the compression ratio. In addition, increasing the compression ratio leads to decreasing the Q˙ex/Q˙ht ratio for all studied fuels. According to the results, there is a direct relationship between the ethanol in fuel content and Q˙ex/Q˙ht ratio. As the percentage of ethanol in fuel increases, the Q˙ex/Q˙ht ratio rises. Thus, the more the ethanol in the fuel and the less the compression ratio, the more the potential for the waste heat recovery of the IC engine. Considering both power and waste heat recovery, the most efficient fuel is E100 due to the highest brake thermal efficiency and Q˙ex/Q˙ht ratio and E85, E15 and E00 (pure gasoline) come next in the consecutive orders. At the engine speeds and compression ratios examined in this study (3000 to 5000 rpm and a CR of 8 to 11), the maximum efficiency is about 35% at 5000 rpm and the compression ratio of 11 for E100. The minimum percentage of heat loss is 21.62 happening at 5000 rpm and the compression ratio of 8 by E100. The minimum percentage of exhaust loss is 35.8% happening at 3000 rpm and the compression ratio of 11 for E00. The most Q˙ex/Q˙ht is 2.13 which is related to E100 at the minimum compression ratio of 8.

scholarly journals Heat Recovery from a PtSNG Plant Coupled with Wind Energy

Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7660
Author(s):  
Daniele Candelaresi ◽  
Linda Moretti ◽  
Alessandra Perna ◽  
Giuseppe Spazzafumo
Keyword(s):  
Natural Gas ◽  
Wind Energy ◽  
Heat Recovery ◽  
Waste Heat ◽  
Fixed Bed ◽  
Operation Time ◽  
Heat Losses ◽  
Proton Exchange ◽  
Thermal Recovery ◽  
Annual Plant

Power to substitute natural gas (PtSNG) is a promising technology to store intermittent renewable electricity as synthetic fuel. Power surplus on the electric grid is converted to hydrogen via water electrolysis and then to SNG via CO2 methanation. The SNG produced can be directly injected into the natural gas infrastructure for long-term and large-scale energy storage. Because of the fluctuating behaviour of the input energy source, the overall annual plant efficiency and SNG production are affected by the plant operation time and the standby strategy chosen. The re-use of internal (waste) heat for satisfying the energy requirements during critical moments can be crucial to achieving high annual efficiencies. In this study, the heat recovery from a PtSNG plant coupled with wind energy, based on proton exchange membrane electrolysis, adiabatic fixed bed methanation and membrane technology for SNG upgrading, is investigated. The proposed thermal recovery strategy involves the waste heat available from the methanation unit during the operation hours being accumulated by means of a two-tanks diathermic oil circuit. The stored heat is used to compensate for the heat losses of methanation reactors, during the hot-standby state. Two options to maintain the reactors at operating temperature have been assessed. The first requires that the diathermic oil transfers heat to a hydrogen stream, which is used to flush the reactors in order to guarantee the hot-standby conditions. The second option entails that the stored heat being recovered for electricity production through an Organic Rankine Cycle. The electricity produced is used to compensate the reactors heat losses by using electrical trace heating during the hot-standby hours, as well as to supply energy to ancillary equipment. The aim of the paper is to evaluate the technical feasibility of the proposed heat recovery strategies and how they impact on the annual plant performances. The results showed that the annual efficiencies on an LHV basis were found to be 44.0% and 44.3% for the thermal storage and electrical storage configurations, respectively.

scholarly journals Application and design of an economizer for waste heat recovery in a cogeneration plant

2016 ◽  
Vol 20 (4) ◽  
pp. 1355-1362
Author(s):  
Igor Martic ◽  
Stevan Budimir ◽  
Nenad Mitrovic ◽  
Aleksandar Maslarevic ◽  
Milos Markovic
Keyword(s):  
Flue Gas ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Energy Use ◽  
Waste Heat ◽  
Cogeneration Plant ◽  
Waste Energy ◽  
Effective Use ◽  
Industrial Heating

Energy increase cost has required its more effective use. However, many industrial heating processes generate waste energy. Use of waste-heat recovery systems decreases energy consumption. This paper presents case study of waste heat recovering of the exhaust flue gas in a 1415 kWe cogeneration plant. This waste heat can be recovered by installing an economizer to heat the condensed and fresh water in thermal degasification unit and reduce steam use for maintaining the temperature of 105?C for oxygen removal. Design methodology of economizer is presented.

Evaluation the Role of Multi-Stage Compression and Waste Heat Recovery on Compressed Air Energy Storage System Performance

2014 ◽  
Vol 492 ◽  
pp. 19-23
Author(s):  
Zuo Gang Guo ◽  
Guang Yi Deng ◽  
Pan Chu ◽  
Guang Ming Chen
Keyword(s):  
Energy Storage ◽  
Energy Conversion ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Heat Rate ◽  
Energy Conversion Efficiency ◽  
Compressed Air ◽  
Compression Process ◽  
Multi Stage

Compressed air energy storage (CAES) has the potential to improve the quality of renewable electricity from wind and solar. The non-continuous electricity from wind and solar can be stored in terms of compressed air energy, which can be released at peak time of state grid. In this paper, the influences of multi-stage compression and waste heat recovery on characteristic of CAES system were investigated. Results indicated that the adoption of multi-stage compression technology obviously reduced its heat rate, and the adoption of heat recovery improved its energy conversion efficiency. Among the three compression cases in this paper, the compression power consumed per kilogram air for the single-stage compression process was 890.83Kj/Kg, while which of the three-stage compression process with inter-cooler reduced to 524.82Kj/Kg. Meanwhile, the CAES system with three-stage compression and heat recovery had a low heat rate of 3974Kj/Kw.h and a high energy conversion efficiency of 59.92%.

Novel Compressed Air Energy Storage (CAES) Systems Applying Air Expanders

1995 ◽  
Author(s):  
Isaac Shnaid ◽  
Dan Weiner ◽  
Shimshon Brokman
Keyword(s):  
Energy Storage ◽  
Gas Turbine ◽  
Waste Heat ◽  
Peak Load ◽  
Electric Energy ◽  
Compressed Air ◽  
Heat Sources ◽  
Compressed Air Energy Storage ◽  
Economic Analyses ◽  
Air Compressors

In Compressed Air Energy Storage (CAES) systems, off-peak electric energy is consumed by air compressors that charge CAES reservoirs. During peak load hours, air released from the CAES reservoir expands, producing electric power. Two novel CAES systems, improving their reliability and efficiency, are introduced. The first system is the CAES Plant Integrated with a Gas Turbine (CAESIGT), in which 40 percent of the power output is produced by a standard gas turbine, and 60 percent by an air expander utilizing compressed air that is preheated by the exhaust gases of the gas turbine. For certain initial parameters of the compressed air, its temperature after expansion becomes lower than the ambient temperature. This cold air can be used as a source for refrigeration of the gas turbine inlet air and for other purposes. In the CAES system of the second type, multistage expansion of compressed air is applied. Reheating air between expander stages is provided either by refrigerated substances, by heat sources from surroundings, or by non fuel heat sources such as the waste heat from industry, solar ponds, etc. Thermodynamic and economic analyses of the novel CAES systems are carried out.

Potential of Energy Saving and Technical Measures in Sintering in China

2011 ◽  
Vol 418-420 ◽  
pp. 207-211
Author(s):  
Xiu Fu Yin ◽  
Su Ju Hao ◽  
Wu Feng Jiang ◽  
Yu Zhu Zhang
Keyword(s):  
Sustainable Development ◽  
Energy Saving ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Electricity Consumption ◽  
The Other ◽  
Sintering Process ◽  
Gas Consumption ◽  
Technical Measures

Compared to Japan sintering process, there is a large potential in energy saving in China. In order to reduce the sintering energy consumption, some effective measures such as reducing the solid fuel consumption, the gas consumption and the electricity consumption should be taken, meanwhile new characteristic technology of energy saving should be developed. Recycling the secondary energy is the other way of energy saving for sustainable development. And most especially, waste heat recovery has a great significance for saving energy.

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