scholarly journals Energy efficient modernization of KVG and TGV boilers

2021 ◽  
Vol 36 ◽  
pp. 22-35
Author(s):  
P. Glamazdin ◽  
D. Glamazdin
Keyword(s):  
Operating Time ◽  
Small Diameter ◽  
District Heating ◽  
Hot Water ◽  
Automation System ◽  
Convective Heating ◽  
Optimized Design ◽  
Efficient Design ◽  
Heating Systems ◽  
District Heating Systems

At present, the district heating systems of Ukrainian cities are in a critical state. They need significant modernization. This especially applies to very important components of district heating systems – heating water boilers. Unsatisfactory condition of boilers is mainly due to the obsolescence of basic equipment, including boilers. The operating time of them exceeds the passport lifetime. There ia a lack of modern automation, especially in terms of controlling operating modes. Nominal power of them exceeds the real heat loads. The range of hot water boilers used is not large. These are low-power boilers of the series NDIST, "Universal", "Energiia", "Fakel" and others, medium-power boilers of the series TVG and KVG and high-power boilers of series PTVM and KVGM. According to their prevalence, special attention should be paid to boilers of the series TVG and KVG. The series are installed on quarter boiler houses. The boilers of these series have an efficient design of the furnace volume and an optimized design of the convective part. Nevertheless, in terms of automation, gas supply and air supply systems, they no longer meet today's requirements. They are outdated comparing to the achieved level of technical solutions. The article discusses the main shortcomings of the design of boilers: insufficient durability of the gas collector in the hearth burner, small diameter of the pipes of the convective part and the use of fireclay materials in the setting of the burners. The first two shortcomings were overcome by the developers by the increase in the diameter of the pipes of convective packages and the modernization of MPIG-3 hearth burners. The third shortcoming should be overcomed by replacing the setting with a modern one during off-season repairs. Reserves for improving the energy efficiency of boilers of these series are found. To do this, it is necessary to install additional convective heating surfaces (economizers or air-heaters), replace the setting and equip the boilers with a modern automation system with cascading the burners. It allows improving efficiency up to 94...95 % and environmental performance according to the modern requirements.

scholarly journals Exergy Analyses of Low-Temperature District Heating Systems With Different Sanitary Hot-Water Boosters

Entropy ◽  
2019 ◽  
Vol 21 (4) ◽  
pp. 388
Author(s):  
Poredoš ◽  
Kitanovski ◽  
Poredoš
Keyword(s):  
Low Temperature ◽  
Winter Season ◽  
District Heating ◽  
Intersection Point ◽  
Exergy Efficiency ◽  
Hot Water ◽  
Heating Systems ◽  
District Heating Systems ◽  
Different Types ◽  
Exergy Analyses

This paper presents an exergy-efficiency analysis of low-temperature district heating systems (DHSs) with different sanitary hot-water (SHW) boosters. The required temperature of the sanitary hot water (SHW) was set to 50 °C. The main objective of this study was to compare the exergy efficiencies of a DHS without a booster to DHSs with three different types of boosters, i.e., electric-, gas-boiler- and heat-pump-based, during the winter and summer seasons. To achieve this, we developed a generalized model for the calculation of the exergy efficiency of a DHS with or without the booster. The results show that during the winter season, for a very low relative share of SHW production, the DHS without the booster exhibits favorable exergy efficiencies compared to the DHSs with boosters. By increasing this share, an intersection point above 45 °C for the supply temperatures, at which the higher exergy efficiency of a DHS with a booster prevails, can be identified. In the summer season the results show that a DHS without a booster at a supply temperature above 70 °C achieves lower exergy efficiencies compared to DHSs with boosters at supply temperatures above 40 °C. The results also show that ultra-low supply and return temperatures should be avoided for the DHSs with boosters, due to higher rates of entropy generation.

scholarly journals Trends in the development of the district heating systems of Ukraine

2021 ◽  
Vol 2021 (1) ◽  
pp. 52-59
Author(s):  
V.O. Derii ◽  
Keyword(s):  
Thermal Energy ◽  
Heat Supply ◽  
District Heating ◽  
Hot Water ◽  
Low Carbon ◽  
Heating Systems ◽  
Fuel Balance ◽  
Generation Structure ◽  
District Heating Systems ◽  
Low Carbon Development

We considered trends in the development of district heating systems (DHS) in Europe and Ukraine. It was established that DHS are widely used and make a significant contribution to the heat supply of European countries. In the European Union as a whole, the share of DHS is 13%, and there are plans to increase it to 50% in 2050 with a wide use of cogeneration and renewable sources of energy, including environmental energy with using heat pumps. Ukraine is one of the countries with a high level of DHS, but, at present, there are negative trends to reducing their contribution to the total heat supply for heating and hot water supply – from 65.2% in 2014 to 52% in 2017. In several cities, DHS ceased to function at all. The main equipment of the DHS of Ukraine is physically worn out and technologically obsolete and needs to be renewed by means of wide reconstruction, modernization, and technological re-equipment. We determined factors and the level of their influence on the demand in thermal energy of DHS. It was established that the factors reducing demand have a much greater potential. We created forecasts of demand for thermal energy, fuel balance, and the structure of DHS generation by 2050. It is shown that the demand for thermal energy from DHS will decrease and reach about 35 million Gcal in 2050. To ensure the low-carbon development of Ukraine in the structure of thermal energy generation in DHS, the use of coal-fired CHPs and boilers, as well as boilers on petroleum products will be significantly reduced. The share of natural gas in the fuel balance of DHS of Ukraine will also decrease, but it will be the main fuel for the period of technological transformation of generating capacities under conditions of the low-carbon development of Ukraine. The use of technologies for the production of thermal energy from biomass, waste, environment, and electricity will gradually increase, and in 2050, using these sources will produce about 23.8 million Gcal, which is more than 60% of the total thermal energy of DHS. Keywords: district heating systems, thermal energy, factors of influence, demand, fuel balance, generation structure

Development of Overground Hot Water Stores in Segmental Construction for Solar and District Heating Systems Within the Project OBSERW

2017 ◽  
Author(s):  
Thorsten Urbaneck ◽  
Fabian Findeisen ◽  
Jan Markus Mücke ◽  
Bernd Platzer ◽  
Dominik Bestenlehner ◽  
...  
Keyword(s):  
District Heating ◽  
Hot Water ◽  
Heating Systems ◽  
District Heating Systems

scholarly journals Hybrid solar-biomass system for district heating

2019 ◽  
Vol 85 ◽  
pp. 04006
Author(s):  
Adrian Ilie ◽  
Ion Vişa
Keyword(s):  
Renewable Energy ◽  
Thermal Energy ◽  
Renewable Energy Sources ◽  
District Heating ◽  
Point Of View ◽  
Hot Water ◽  
Energy Sources ◽  
District Heating System ◽  
Heating Systems ◽  
District Heating Systems

The energy used in the built-up environment represents at least 40% of the total energy consumed, out of which, at least 60% is required for heating, cooling and domestic hot water (DHW). Within the European Union, more than 6,000 communities (i.e. over 9%) use district heating systems, the majority of which use the conversion of fossil fuels as a source of energy. This aspect, which is corroborated by the directives of the EU legislation on the use of renewable energy sources and energy performance, imposes the development of new solutions through which the existing district heating systems may be adapted to use renewable energy sources. The solar-thermal systems that are used on a large (district) scale are becoming more and more efficient from the point of view of their feasibility; however, it is almost impossible to create systems that should satisfy the thermal energy demand throughout the four seasons of the year. The hybrid solar-biomass system is becoming the applicable solution for the majority of the communities that have from this potential, since it can secure independence from the point of view of the use of thermal energy. This paper presents the design stages for the implementation of the hybrid solar-biomass systems with a view to identifying the optimal solutions for systems to be integrated into an existing district heating system. A case study (Taberei District in Odorheiu Secuiesc City), which provides a detailed description of the feasible technical solutions, is presented.

Practice of Heat Utilization from Refuse

1980 ◽  
Vol 102 (4) ◽  
pp. 230-233
Author(s):  
W. J. Martin ◽  
H. Weiand
Keyword(s):  
Water Supply ◽  
Heat Recovery ◽  
District Heating ◽  
Hot Water ◽  
Fuel Oil ◽  
Heating Systems ◽  
Heat Utilization ◽  
District Heating Systems ◽  
Hot Water Supply ◽  
Sludge Drying

Many European refuse incinerators utilize the heat derived from refuse incineration for steam or hot water supply to district-heating systems or to certain industries for generation of electricity, for sludge drying, etc. The design of five typical incinerators with heat recovery is outlined and the value of recovered energy in terms of fuel oil savings is tabulated.

A Modelling Technique for Estimating Hot Tap Water Consumption in District Heating Systems

1994 ◽  
Vol 208 (2) ◽  
pp. 79-87 ◽  
Author(s):  
G R Jónsson ◽  
A Holtsberg ◽  
V K Jónsson
Keyword(s):  
Mass Flow ◽  
Water Consumption ◽  
Tap Water ◽  
District Heating ◽  
Hot Water ◽  
District Heating System ◽  
Heating Systems ◽  
Average Mass ◽  
Yearly Average ◽  
District Heating Systems

This paper is concerned with estimating the hot tap water consumption in district heating systems when direct measurements of the hot tap water are not available. Instead, only measurements of the total mass flow, that is the mass flow for both heating and hot water are assumed available. Thus, a method is needed that may be applied in order to separate the mass flow into these two parts, or even more if the mass flow is assumed to be consisting of more than two factors. Here, the mass flow is divided into one part dependent upon climate variables and one part that is independent of the climate. By assuming that the hot tap water consumption is to a high degree independent of the weather, the latter part is an estimate of the hot tap water. The data are from the Reykjavik Municipal District Heating System in Iceland. The results show that the hot tap water consumption has a noon and an evening peak and is at its minimum around 4 a.m. The average consumption is about 10 per cent of the yearly average mass flow. Furthermore, the consumption is highest during the winter time and lowest during the summer time. It was found sufficient to use one tap water profile on working days and one for weekends. It is shown that the solar effect on the mass flow is quite moderate. During working days it is about 1.2 per cent of the yearly average mass flow and 1.6 per cent during weekends (based on 10 hours of sunshine per day).

Sign in / Sign up

Export Citation Format

Share Document