Design and Characterization of Flue Gas Waste Heat Power Generation Plant
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This paper proposes a waste heat recovery system based on temperature difference power generation, which aims to utilize the residual heat in the exhaust flue of chimneys or kilns. The system consists of three parts such as heat collection module, semiconductor power generator, and heat dissipation module, and the residual heat is directly converted into electrical energy and output by temperature difference power generation. The voltage and resistance are measured and analyzed on this basis. This design realizes the waste heat recovery of boiler flue gas, prevents a large amount of waste heat from being discharged into the environment, reduces the greenhouse effect and makes secondary use of the waste heat.Keywords:
Recuperator
Air preheater
Flue
Air preheater is an equipment to use the residual heat from flue gas for enhancing the efficienly of the unit.Its running efffect directly influnces the thermal efficiency of the unit.Reducing the air leakege in the air preheater can enhance the efficiency of the unit and reduce the flue gas loss,so that it can economize coal resources.
Air preheater
Flue
Power unit
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A ground-source heat pump (GSHP) system designed to cooperate with a low temperature heating system and hot water production was installed in a new passive house nearby the city of Poznan (Poland). The paper describes an integration of the GSHP system with a heat exchanger on the supply airflow in order to recover the waste heat from outside (fresh) ventilation air and store it in the ground during summer, as well as to heat the supply air in winter what prevents the recuperator from freezing. Analytical calculations to evaluate the energy, economy and environmental benefits of supplying the low heat reservoir with heat from fresh air were made. Chilled supply air compensates the heat gains from building and is exhausted, simultaneously overcoming a part of the cooling loads by using mechanical ventilation system. Heat taken in the heat exchanger by the glycol mixture is used in the evaporator of the heat pump, which produces hot water with increased energy efficiency – increased coefficient of performance (COP). After that glycol mixture is supplied to the ground. In the case of stagnation of the heat pump, glycol mixture exiting the heat exchanger is directed to the ground, where part of the delivered waste heat is stored. The results of calculation experiment indicated that heat recovered from the supply ventilation air during summer is increasing the Seasonal Performance Factor (SPF) of the heating system in winter, consequently significant energy savings can be achieved, what is a part of the idea of the Sustainable Development. Based on the simulations it has also been demonstrated that the proposed technical solution has a high application potential for micro and macro scale installations using GSHP.
Recuperator
Coefficient of performance
Energy recovery ventilation
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To reduce building's heating and cooling loads, it is crucial to employ energy recovery systems that use exhaust air to precondition ambient fresh air, thereby recovering a large quantity of energy and reducing the overall HVAC (heating, ventilation and air conditioning) energy requirement. Enthalpy heat exchangers (EHE) that use a porous membrane as the heat and moisture transfer surface are effective devices for recovering latent and sensible energy. In this paper, we designed a heat exchanger using Solidworks that will be introduced to a heat recovery ventilation system. The recuperator was analyzed using different materials such as aluminum, PLA, copper and steel using ANSYS to have the best performance material of the heat exchanger to get the most efficient heat recovery ventilation system. The results of the finite element analysis showed that if we use steel and aluminum, water vapor will freeze at the hot air outlet. PLA is the most convenient material to use in the heat exchanger (HX) due to its good performance showed in the finite element analysis and to its low price.
Recuperator
Energy recovery ventilation
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Heat recovery technology in building is an important way of reducing energy consumption and this article probes into the common types of heat recovery system.It describes the application principle of heat pump heat recovery system,gives the evaluation method of heat recovery system and by comparing it with common sensible heat recovery system,explores the energy saving potential of heat pump heat recovery system in Jinan climate conditions.The results show that heat recovery system efficiency can reach 3.18 when the common heat recovery device and heat pump heat recovery system are used jointly in winter in the central air conditioning system of large exhaust air.
Energy Recovery
Coefficient of performance
Recuperator
Renewable heat
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Air Preheater is an energy-saving apparatus for recover high-temperature waste flue gas made by the hot air system.The Ironmaking Plant reconstructed an old air preheater of No.1 blast furnace,which effectively enhanced its air preheating effect,decreased coke ratio and obtained considerable economic benefits.
Air preheater
Flue
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Using the practical engineering example of the rotary air preheater retrofit adopting'double sealing technique
'in a power plant, the conditions of the air preheater before and after the retrofit were introduced. The effect of air
leakage rate and tail flue gas temperature on boiler efficiency was emphatically analyzed. The evaluation method for
air preheater performance was given also.
Air preheater
Flue
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Background. Today, based on the increasing use of non-renewable energy sources, which leads to their reduction in the world, more and more countries are switching to renewable energy sources. The main problem of the present is saving of natural resources of the Earth, and the use of an environmentally safe alternative. Technological progress leads to an increase in the need for energy, thermal or electric, which leads to the creation of new technologies or the improvement of existing ones.Objective. Finding the conditions for maximizing the energy efficiency of heat pump systems for air heating and ventilation of buildings by combining a heat pump and means of rational use of heat of exhaust ventilation air.Methods. In the article, a thermodynamic and numerical analysis of the energy efficiency of the heat pump system of air heating and ventilation with the heat recuperator and the recirculation of exhaust air was carried out.The analysis of existing heat pump systems was carried out and the complex of the auxiliary equipment of the heat pump system was improved.Results. A complex of equations describing the thermodynamic state of the heat pump system and the specific energy consumption of heating and ventilation are obtained. The graphs of changing the parameters of the system are shown, depending on the temperature of the outside air and the parameters of the heat utilization devices of the exhaust air. The optimal mode of operation of the heat pump system is determined and the influence of the temperature of the outside air on the operation of the heat pump is determined.Conclusions. It has been shown that the combined heat pump heating and ventilation system with heat recuperator and partial recirculation of exhaust ventilation air has the maximum energy effect when placing the mixing chamber of exhaust and fresh air flows in front of the condenser of the heat pump.
Recuperator
Energy recovery ventilation
Renewable heat
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This article mainly described the problems existed in our CO furnace,measures had been taken to solve these problems,lie to stop the flue gas short cut,to add the air preheater,the low low temperature heater and install the ash blower.After revamp of this furnace,we have achieved the desired results.
Air preheater
Flue
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In actual operation, the fuel stack in the rear flue or on the heating surface is the cause of secondary burning. Based on existing status of 300MW boiler rotary air preheater system, this article analyzes the root causes of secondary burning and provided related technical improvement measures and precautions to prevent secondary burning, so as to ensure safe running of air preheater.
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Flue
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A tubular oscillating heat pipe (OHP), with long form factor and 1 × 0.5 m2 footprint, was experimentally characterized for passive waste heat recovery via air-to-air heat exchange in a typical Heating Ventilation & Air Conditioning (HVAC) ducting system. Experiments were designed to demonstrate the OHP's ability to utilize otherwise wasted thermal energy to pre-heat or pre-cool air for reducing building energy consumption. Results indicate that the OHP is fully-capable of operating while possessing a relatively long form factor (>1 m) and as a forced convection, air-to-air heat exchanger for waste heat recovery in HVAC systems.
Recuperator
Energy recovery ventilation
Forced convection
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