Investigation and optimization of the depth of flue gas heat recovery in surface heat exchangers

Bespalov, Victor; Bespalov, V. I.; Melnikov, Denis

doi:10.1134/s0040601517090026

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…д.) [7,8] с целью повышения энергетической эффективности теплоэнергоустановок и снижения их тепловых потерь. Кроме того, решается экологическая проблема улавливания диоксида углерода и предотвращения выброса его в окружающую среду.…”

Section: схема и принцип работы установкиunclassified

“…Кроме того, решается экологическая проблема улавливания диоксида углерода и предотвращения выброса его в окружающую среду. Предлагаемая установка может работать на вторичных энергоресурсах, которые в настоящее время используются в крайне ограниченных объемах [7].…”

Section: схема и принцип работы установкиunclassified

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Carbon Dioxide Turbine Expander Plant Producing Liquid and Gaseous Carbon Dioxide

Овсянник

2019

Izv. vysh. ucheb

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The scheme of carbon dioxide cogeneration and trigeneration plant with the use of secondary energy resources in the form of combustion products or flue gases that enables to produce electricity, thermal energy and cold for centralized and decentralized supply of consumers simultaneously, is presented. In addition, the plant can produce liquid and gaseous carbon dioxide. The main elements of the plant are a heating unit, a turbodetander unit and a carbon dioxide unit for the production of cold, liquid and gaseous carbon dioxide. A thermodynamic calculation and a brief exergy analysis of the plant were carried out. In the proposed plant, off-gases from glassmelting, metallurgical furnaces, heat power facility and other energy facilities with a secondary energy temperature of 250–400 °C and above can be used as secondary energy resources. The heating unit of the installation has been designed to produce thermal energy for heating and hot water supply systems. The carbon dioxide unit has been designed for the production of cold, electric energy and carbon dioxide in liquid and gaseous form in order to ensure the operation of the plant and the use for commercial purposes. The cold in the plant can be obtained in two evaporators operating at different boiling temperatures. At a higher boiling point of carbon dioxide, cold is used in air conditioning systems and in centralized cooling and storage systems, while at a lower boiling point of carbon dioxide – in freezing and storage systems. For the implementation of the reverse carbon dioxide cycle, a three-stage carbon dioxide compressor with a receiver after the third stage is used. To reduce compression performance of the compressor, complete intermediate cooling of carbon dioxide between stages should be provided.

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Section: схема и принцип работы установкиunclassified

Carbon Dioxide Turbine Expander Plant Producing Liquid and Gaseous Carbon Dioxide

Овсянник

2019

Izv. vysh. ucheb

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“…up to values of 0.045 ÷ 0.055 kg / kg d.g. This also leads to a decrease in the dew point temperature from 55 0 C to 40 0 C [1,2]. The condition for the long-term operation of external gas ducts and chimneys is to ensure a thermal regime in the cold season without the appearance of condensation on the internal surfaces of the gas ducts.…”

Section: Introductionmentioning

confidence: 99%

Studying on thermal processes during the motion of combustion products in the gas chimneys of the heat power plant

Anarbaev

Kodirov²,

Khushiev³

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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This article discusses the new in Uzbekistan heat recovery technology is leaving the flue gas from boilers. This is achieved by condensation of water vapor therein. An analysis of the advantages and disadvantages of contact heat recovery and surface types. The analysis of the heat transfer coefficients in the condensing heat exchanger surface. The temperature regimes which provide point of the flue gas dew point. The limited stresses in the chimney of the boiler unit are calculated using condensing heat utilizers of the exhaust gas for stations of Uzbekistan.

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“…Existing methods of waste heat recovery of flue gas are various. Bespalov et al investigated a flue gas waste heat recovery system using plate heat exchanger. The influence of flue gas temperature at the outlet of heat recovery heat exchanger on the additional heat recovery power was achieved, and a correlation formula was deduced to determine the optimum heat recovery depth.…”

Section: Introductionmentioning

confidence: 99%

Performance simulation of a low-swirl burner for a Stirling engine

et al. 2019

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Summary A new type of gas burner for Stirling engine that can recover adequate heat from exhaust gas was designed based on the plate heat exchanger and low‐swirl combustion technology, which consists of three components: a cyclone, a burner, and a circular plate heat exchanger. The circular plate heat exchanger tightly wound around the combustion chamber plays a high efficiency of heat recovery role. In consideration of the radial symmetry of the burner, a three‐dimensional numerical simulation was carried out by Ansys15. The velocity distribution, temperature distribution, and pressure distribution of the combustion gas were presented respectively. Strong backflow that came from the exhaust gas around the root of the flame in the combustion chamber and a vortex below the inlet of the exhaust gas channel were found, which were beneficial for the combustion and improving the uniformity of temperature distribution. Combustion behaviors of the burner under standard operating conditions were obtained, the highest temperature was about 2200 K in burner and the exhaust gas entered the plate heat exchanger at the temperature of 1375 K and exited at 464 K, with the waste heat recovery efficiency over 65.8%. And, the air‐fuel ratio and combustion power had negligible effect on the waste heat recovery efficiency.

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Investigation and optimization of the depth of flue gas heat recovery in surface heat exchangers

Cited by 4 publications

References 3 publications

Carbon Dioxide Turbine Expander Plant Producing Liquid and Gaseous Carbon Dioxide

Carbon Dioxide Turbine Expander Plant Producing Liquid and Gaseous Carbon Dioxide

Studying on thermal processes during the motion of combustion products in the gas chimneys of the heat power plant

Performance simulation of a low-swirl burner for a Stirling engine

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