scholarly journals Flue Gas Removal Systems Are a Key Issue in the Application of Condensing Boilers

2021 ◽  
Vol 2096 (1) ◽  
pp. 012057
Author(s):  
P Khavanov ◽  
A Chulenyov
Keyword(s):  
Flue Gas ◽  
Heat Supply ◽  
Combustion Products ◽  
Operating Conditions ◽  
Exhaust Gases ◽  
Fuel Savings ◽  
Gas Removal ◽  
Supply Systems ◽  
Smoke Removal ◽  
Removal System

Abstract This article is devoted to the most pressing issue of the use of condensing boilers in Russia for autonomous heat supply systems - the organization of smoke removal. If we compare a standard gas boiler with its condensing counterpart, then we can come to the conclusion that their differences lie not only in some innovations, but in radically different principles of operation. Yes, in both cases, the heating of the coolant occurs due to the combustion of the gas, but in the condensing boiler, the heating of the coolant is additionally performed with the help of exhaust gases. Moreover, the smoke removal system in this case produces the primary heating of the liquid - the exhaust gases, which contain a large amount of water vapor, first heat the coolant, and only then directly the gas heats it up to the specified temperature. It is thanks to all this that fuel savings occur - the efficiency of condensing boilers is 15-20% higher compared to standard units of this type. The set of domestic directives and regulations on autonomous heat supply in individual issues, focusing on foreign developments, at the same time has significant features in the requirements for the design and operating conditions of combustion products removal systems, especially for condensing boilers.

Improvement of the methodology assessment of reliability heat supply systems at the facilities of main pipelines

2021 ◽  
pp. 198-202
Author(s):  
Марина Николаевна Ильина ◽  
Дмитрий Васильевич Ларюшкин
Keyword(s):  
Cluster Analysis ◽  
Heat Supply ◽  
Network Reliability ◽  
Reliability Assessment ◽  
Heat Supply System ◽  
Operating Conditions ◽  
Heat Network ◽  
Heat Networks ◽  
Heat Supply Systems ◽  
Supply Systems

Источником информации о техническом состоянии трубопроводов тепловых сетей объектов магистральных нефтепроводов ПАО «Транснефть» являются результаты их обслуживания и ремонта, технического освидетельствования, гидравлических испытаний и т. д. На основании этих данных проводятся расчеты показателей надежности, по итогам анализа которых осуществляется планирование дальнейшего технического обслуживания и ремонта. Однако при оценке надежности систем теплоснабжения необходимо учитывать не только срок эксплуатации и величину амортизационного износа, но и реальное состояние в конкретных условиях функционирования. Учесть многообразие факторов, которые влияют на работоспособность трубопроводов системы теплоснабжения, и тем самым повысить точность расчетов при оценке их остаточного ресурса позволяет применение кластерного анализа в дополнение к используемой методике оценки надежности тепловых сетей. В рамках настоящей работы оценка надежности объектов АО «Связьтранснефть» с применением кластерного анализа проведена на примере равнозначных участков тепловых сетей двух узлов связи, расположенных в Краснодарском крае и Республике Саха (Якутия). Currently, information about technical condition of pipelines of heat supply systems at the facilities of the main oil pipelines of PJSC Transneft is formed based on the results of maintenance and repair, technical inspection, hydraulic tests, etc. Upon these data, calculations of reliability indicators of heat networks are carried out, based on the analysis of calculations further maintenance and repairs are planned. However, when assessing the reliability of heat supply systems, it is necessary to take into account not only the service life and the amount of depreciation wear of heat network elements, but also their real state in specific operating conditions. The use of cluster analysis in addition to the currently used method of heat network reliability assessment allows us to take into account the variety of factors that affect the operability of pipelines of the heat supply system, and thereby increase the accuracy of calculations when assessing their residual resource. Within the framework of this work, the reliability assessment of Svyaztransneft JSC facilities using cluster analysis was carried out on the example of equivalent sections of heat networks of two communication nodes located in the Krasnodar Territory and the Republic of Sakha (Yakutia).

scholarly journals Problems of organization of operating conditions of large heat supply systems and their solutions based on multilevel modeling

2018 ◽  
Vol 39 ◽  
pp. 03007 ◽  
Author(s):  
Zoya I. Shalaginiva ◽  
Vyacheslav V. Tokarev
Keyword(s):  
Heat Supply ◽  
Information Technologies ◽  
Computing System ◽  
Operating Conditions ◽  
Large Cities ◽  
Hydraulic Conditions ◽  
Large Heat ◽  
Multi Level ◽  
Heat Supply Systems ◽  
Supply Systems

The paper unveils relevance of applying the methodology of multi-level modeling of thermal-hydraulic conditions of heat supply systems (HSS) and the software which are realized in the informationcomputing system “ANGARA-TS”, which make possible development of operating conditions and adjustment measures in HSS of any structure and complexity including non-standard circuit designs. Application of the multi-level modeling of HSS that is based on integration of mathematical models, methods and information technologies allows one to link the main principle of mathematical modeling that contributes to rational correspondence of the degree of mathematical model detail with the goals of its use, and modeling for different purposes. Information-computing system is implemented in a variety of real HSS of large cities in the organization of regimes and development of adjustment activities. The paper describes the experience of using new methods for development of operating conditions of large HSS in real towns.

Furnace Design for Improved Exhaust Gas Circulation and Heat Transfer Efficiency

2020 ◽  
Author(s):  
Ayoola T. Brimmo ◽  
Mohamed I. Hassan Ali
Keyword(s):  
Heat Transfer ◽  
Metal Surface ◽  
Flue Gas ◽  
Waste Heat ◽  
Operating Conditions ◽  
Aluminum Production ◽  
Exhaust Gas ◽  
Gas Temperature ◽  
Exhaust Gases ◽  
Gas Circulation

Abstract In the aluminum production industry, metal furnaces are operated by diffusion flame over the metal surface to maintain the aluminum metal at the set point temperature for alloying and casting. Heat is transferred from the flame and its exhaust gases to the metal surface via radiation and convection. The exhaust gases leaves through the furnace’s chimney carrying a significant amount of waste heat to the atmosphere. Furnace efficiency could be improved by enhancing the heat transfer inside the furnace. In this study, a validated full-scale 3-D CFD model of a natural gas fired aluminum furnace is developed to investigate the effect of flue gas ventilation configurations and burner operating conditions on the heat transfer inside the furnace. Onsite measurements are carried out for the fuel and airflow rates as well as flue gas temperature. Four flue ventilation configurations are considered with eight furnace’s operation modes. The flue-gas’s waste-heat varies from 49–58%, with the highest value occurring at the high-fire operating mode. This indicates a significant room for improvement in the furnace performance. Results suggest that a symmetrical positioning of the exhaust duct favors effective exhaust gas circulation within the furnace and hence, increases hot-gases’ heat-transfer effectiveness inside the furnace. These results provide some guidelines for optimal aluminum reverberatory furnace designs and operation.

Computational and Experimental Study of Gas Bubbles Removal in a Microfluidic System

2015 ◽  
Author(s):  
Hamed Gholami Derami ◽  
Jeff Darabi
Keyword(s):  
Flow Direction ◽  
Gas Bubbles ◽  
Microfluidic System ◽  
Operating Conditions ◽  
Hydrophobic Membrane ◽  
Fluidic Channel ◽  
Ansys Fluent ◽  
Gas Removal ◽  
Bubble Removal ◽  
Removal System

Formation of unwanted bubbles is one the main issues in biomicrofluidics-based applications such as lab-on-a-chip devices, and adversely affects the performance of these systems. In this work we report a simple and efficient method for removing gas bubbles from liquid filled microchannels. This bubble removal system consists of a cavity on which a hydrophobic membrane is bonded parallel to the main fluidic channel to vent gas bubbles normal to the flow direction. A T-junction configuration is used to generate gas bubbles prior to entering the bubble removal cavity. A finite volume-based computational model is developed using ANSYS FLUENT to simulate gas removal characteristics of the system. The effects of various geometric parameters and operating conditions are studied both through numerical simulations and experimentally.

scholarly journals REDUCTION OF NATURAL GAS CONSUMPTION AND REDUCTION OF EMISSIONS WITH COMBUSTION PRODUCTS IN MUNICIPAL HEAT SUPPLY

2019 ◽  
Vol 41 (2) ◽  
pp. 54-63 ◽  
Author(s):  
O. Sigal ◽  
N. Pavlyuk ◽  
S. Pashyhin
Keyword(s):  
Natural Gas ◽  
Heat Supply ◽  
Combustion Products ◽  
Partial Replacement ◽  
Economic Point ◽  
General Plan ◽  
Temperature Mode ◽  
Technical Specifications ◽  
Heat Supply Systems ◽  
Supply Systems

The technical solutions are proposed to reduce the consumption of natural gas, as well as to reduce emissions with combustion products in the municipal heat supply systems: - New constructions of water-tube and water-fire-tube boilers with improved technical, economic and environmental characteristics have been developed. Replacing of old boilers with these boilers within Ukraine will provide an economic effect of about 100 thousand tons of fuel equivalent per year. NOx reduction will be up to 35%; - The new temperature mode for heating networks 115/70 oС has been developed, which provides the amount of heat that is adequate to the needs of consumers, and is appropriate for use in cities of the country from an economic point of view. However, the implementation of such reduced temperature mode requires a corresponding change in the general requirements when issuing "Technical Specifications" for connection to district heating systems, necessitates changes in the temperature mode values in other documents, for example the general plan of the city, as well as the possible need to change the calculated heat loads in concluded contracts for heat supply to consumers.  Nevertheless, the correction of temperature modes of cities should be considered as one of the possible measures to improve the energy efficiency of heat supply systems; - The expediency of partial replacement of natural gas in the municipal heat supply systems of large cities of Ukraine with municipal solid waste (MSW) has been proved. The ways of improving the efficiency of mixed MSW combustion in conditions of country, including the extraction of "wet" biowaste from the total mass of mixed MSW with using a separate collection. are determined; - To achieve compliance with the new more stringent European environmental standards, the highly efficient devices for cleaning combustion products from particulate matter and sulfur oxides have been developed. The efficiency of dust removal in centrifugal filters is 90...98%, in cyclone dust collectors - 90...93%. Desulfurization efficiency is up to 50%.

scholarly journals INFORMATION COMPUTING COMPLEX "ANGARA-HS" FOR CALCULATION AND ANALYSIS OF OPERATING CONDITIONS OF LARGE MULTILOOP HEAT SUPPLY SYSTEMS UNDER CONTROL

2018 ◽  
Vol 22 (11) ◽  
pp. 126-144 ◽  
Author(s):  
Nikolay N. Novitsky ◽  
◽  
Vyacheslav V. Tokarev ◽  
Zoya I. Shalaginova ◽  
Aleksandr V. Alekseev ◽  
...  
Keyword(s):  
Heat Supply ◽  
Operating Conditions ◽  
Heat Supply Systems ◽  
Supply Systems

scholarly journals Creating an environmentally safe and reliable heat supply system through the introduction of energy-saving technologies in housing and common utilities services

2021 ◽  
Vol 265 ◽  
pp. 04020
Author(s):  
Galina V. Astratova ◽  
Tatyana K. Rutkauskas ◽  
Konstantin V. Rutkauskas ◽  
Vladimir V. Klimuk
Keyword(s):  
Energy Saving ◽  
Heat Supply ◽  
Online Survey ◽  
Heat Supply System ◽  
Combustion Products ◽  
Environmental Safety ◽  
Environmentally Safe ◽  
Utilities Services ◽  
Supply Systems

The rational use of natural resources and the creation of an environmentally safety is a priority goal for all mankind. The increasing pollution of the atmospheric air by the combustion products of various types of fuel actualizes the problem of improving the environmental safety and efficiency of heat supply systems (HSS). Heating is the most energy intensive and wasteful sector of the national economy, because the turnover is comparable to 2.1% of GDP and an average of 50% in payment of citizens for housing and communal utility services (HCUS). However, HSS today is in a critical state at all stages of production, distribution and consumption of heat, which is especially typical for HCUS enterprises in Russia. Accordingly, the population is not satisfied with the quality and price of HCUS services. The purpose of the study was to develop a mechanism for creating an environmentally safe and reliable HSS by introducing energy-saving technologies that can improve the quality and reduce the price of HCUS services. The data analysis of the online survey of Russians in social networks in 2018-2019 is carried out. The average level of the population satisfaction with the quality of the provided services of HSS is determined.

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