Method of detection of district heating pipe network leakage using data monitoring of heat energy consumers

Currently, information systems to get data of metering devices are introduced to calculate the consumed thermal energy. The metering devices are installed at the thermal station of the consumers. However, the processing of these data is usually limited to the monthly data collection to calculate the payments and to monitor the output of the observed parameters beyond the established boundaries. The urgent issue is the possibility to use these data for the in-depth study of the processes, and, in particular, to detect district heating pipe network leakage. The authors have used both the methods and tools to model and analyze the operating modes of district heating pipe networks, methods to collect and monitor data of heat supply metering devices, methods to model district heating pipe networks in the geoinformation systems environment. The authors have proposed the method to detect the sections of the heat network where a heat medium leak has occurred. The difference of the method is the use only of the readings of the metering devices installed at consumers. The limitations of the application of the method and its implementation in geoinformation system environment are considered. An example is given to illustrate the possibility to detect the location of leakage based on the analysis of real data of the house heat metering devices collected during leakage and leakage elimination. Practical application of the developed method is discussed by the example of a real situation of leakage at the section of the heat network of the ISPU boiler house. The results obtained have confirmed the possibility to detect localization of leakage in heating networks based on the analysis of meter readings installed at consumers. The developed method can be applied in information systems to monitor the operating modes of district heating networks to search the places of accidents.

Improving the environmental friendliness of a solid fuel boiler house using SHF energy

To reduce harmful emissions, solid fuel consumption and increase the efficiency of the boiler plant, an automated system with a combined heating device and a condensing air heater connected in series was designed. In a combined heating device (SHF + flue gases) equipped with a magnetron, quality control and additional preparation of solid fuel with a high moisture content (up to 80%) for combustion are carried out. In the condensing air heater, the heat of the flue gases coming into it from the combined heating deviceand the latent heat of vaporization are extracted. The use of this system allows reducing the moisture content and temperature of flue gases, the volume of harmful emissions from the boiler plant in the form of nitrogen oxides and dioxides (NOx), carbon oxides (CO), ash, volatile coke residues. By increasing the volume and reducing the corrosiveness of the condensate formed from the flue gases in the condensation air heater during the drying process of fuel with a high moisture content, it can be subsequently used as process and make-up water. Practical application of the system makes it possible to reduce the cost of generating heat energy by the boiler house by increasing the use of low-calorie fuel with a high moisture content in the form of waste from logging, wood processing, low-grade coal and peat, which also has a positive environmental effect.

Energy efficiency of an absorption thermotransformer with two-stage absorption as part of a heat and cold supply complex based on a gas boiler house

The article proposes a scheme for using a lithium bromide absorption thermotransformer (LBATT) with two-stage absorption for deep utilization of the heat of combustion products (CPs) of gas boilers. At the same time, this solution allows heating the dictrict heating systems return water in the cold season. In the warm season, LBATT is used to cool the water of the air conditioning system or process equipment cooling. In this case, heat removal from LBAHT with two-stage absorption in the warm season is carried out using an drycooler. The analysis of the effectiveness of the use of LBATT in the cold and warm seasons is carried out. The theoretical transformation coefficient of LBATT with deep utilization of flue gases reaches 1.72. The theoretical thermal coefficient of LBATT when cooling water in the warm season reaches a value of 0.7.

Energy Efficiency of DH System with Wood Chips Boiler Houses and Flue Gas Condensing Unit

This study proposes a method for the evaluation of the efficiency of a heat supply system based on a correlation analysis of the data of the system's operations. The data from the system's operations have been analysed and a correlation equation has been applied to obtain the results of the analysis, which are then used for further calculations. The data can be divided into two groups: data characterising the condenser operations in the boiler house, and data characterising heating networks.

Archaeological Study in Saint Petersburg, Novgorodskaya Street, in 2018

Исследования на территории ЭС-2 Центральной ТЭЦ филиала «Невский» ПАО «ТГК-1» на Новгородской улице в Санкт-Петербурге проведены в связи с предстоящим строительством водогрейной котельной. Были изучены небольшие участки сохранившегося непотревоженного культурного слоя, фрагмент деревянного сооружения (шурф 3), каменного фундамента (шурф 5), мощение Старорусской улицы и дренажный колодец под ним (шурф 4). В результате на основании исторических данных и полевых работ был выявлен объект археологического наследия «Рождественская часть 1. Участок культурного слоя города Санкт-Петербурга XVIII - начала XX в.». Работы на объекте продолжаются. The excavations on the Novgorodskaya street in St. Petersburg were conducted due to the upcoming construction of a hot water boiler house. Small sections of the preserved, undisturbed cultural layer; a fragment of a wooden structure (pit 3); stone foundation (pit 5); the pavement of Starorusskaya street and a drainage well underneath it (pit 4) were studied. As a result, the object of archaeological heritage “Rozhdestvenskaya site 1. The sector of cultural layer of the 18 - early 20 centuries' city of St. Petersburg” was revealed, based on historical data and fieldwork. Archaeological study on the site continues.

Improving the reliability of the energy supply to the district boiler house

Currently, measures are being worked out at generation facilities, in particular at district boiler houses, the implementation of which will increase the reliability of both individual elements of the system and the entire energy supply system as a whole, improve its technical and economic indicators, and achieve the target financial indices of the enterprise. As one of such measures, the article considers the ways of organizing a mini-TPP (thermal power plant) on the example of a large district boiler house for the purpose of energy supply for their own needs. This solution will increase the energy independence of the boiler house from the external network, reduce the cost of electricity consumption. The paper presents the results of a technical and economic analysis of options for organizing own generation, taking into account the actual operating conditions of the boiler house, linking the mini-TPP to the existing communications of boiler house, the impact of the joint operation of the mini-TPP and the boiler house on the sanitary zone. Based on the analysis of the loading graphs of the electric equipment of the boiler house, the required capacity of the gas engine generator plant and the place of its installation on the production site are determined. The operation of the gas engine generator plant involves the production of electric energy only for its own needs without issuing it to an external electrical network, in connection with which an automation system is provided that does not allow electricity to be issued to an external network. This restriction is related to the requirements of the technical specifications of the electric grid company.

Introduction

A folk-music competition of 1895 sets the scene for an exploration of the problem of French music historiography in relation to the provinces between the 1830s and World War II. Key terms (“decentralization,” “deconcentration,” “regionalism”) are defined and explained in relation to Republican concepts of cultural unity that long discouraged regional difference in music and reinforced the soft and hard power of the capital as the nation’s cultural boiler house: power relations turned the provinces into an “internal exotic,” but the “colonies” of mainland France had their own often distinctive local dynamics relating to professional and amateur music-making. The narrative arc of the book is sketched out: from the dynamics of provincial musical life to the challenges of musical regionalism as it manifests in new composition. Finally, methodological reflections are offered on the project’s archival source-base, on the problematic ephemerality of musical life as a subject of diachronic musicological study, on music as an object of local memorialization, and on the geographical patterns of both decentralist and regionalist French musical life as showing particular density at the edges at the expense of the center.

USE AND DISPOSAL OF ACIDIC WATER CONDENSATE FROM GAS-FIRED BOILER UNITS

During operation in boiler units of modern condensing boilers or modernization of old-style boilers, water condensate is formed due to heat-recovery equipment in the mode of cooling exhaust-gases below the dew point of water vapor. At natural gas is burned in equipment, the range of values of the pH value of the condensate is within the range of 3 ÷ 6. In this connection, the problem arises of the useful use of this condensate or its safe drainage into the sewer network. At useful use, the resulting condensate can be used for the needs of the boiler units (for washing boilers, in chemical water-purification systems) or outside the boiler house (for laundries, greenhouses, swimming pools, etc.). In the case of condensate drainage into the city sewer network, as a rule, its preliminary decarbonization is required. This is a necessary environmental measure and operational standard to protect the sewer network and related equipment, including treatment facilities, from premature wear. Among the directions of condensate decarbonization known in Ukraine, the most common are: - decarbonization by degassing by the contact method, which consists in removing CO2 from the heated solution by blowing air in the nozzle layer (ceramic or plastic), through which condensate flows. Degassing occurs due to the instability of the H2CO3 compound, which, when heated, easily decomposes into H2O and CO2; - chemical decarbonization, by combining carbon dioxide in an insoluble compound with various reagents, which are added to the container using a dispenser; - decarbonization by passing the condensate through a granular filter containing calcium carbonate, such as marble chips or lime. Removal of carbonic acid from condensate during filtration in a layer of marble chips is seen as the simplest method of decarbonization of water condensate from those considered. On the basis of this method of decarbonization, the authors propose a technical solution for the developed neutralizer with a description of its design and operating principle. The paper presents the results of calculated studies of the volumes of formed condensate and an example of its safe use in the case of modernization of a gas-fired water-heating boiler with a nominal thermal power of 1 MW by a heat-recovery system with simple or complex use of heat. It is shown that when using modern heat-recovery technologies in gas-fired boiler houses, there are different circuit and technical solutions for possible useful use or safe evacuation of acidic condensate formed during the implementation of these technologies. In cases where it is advisable to neutralize this condensate, there are effective methods for its decarbonization and appropriate equipment.

TECHNICAL AND ECONOMIC RATIONALE OF A GAS-PISTON USE IN A MEDIUM-CAPACITY BOILER HOUSE

Рассмотрена проблема сокращения затрат при потреблении электрической энергии оборудованием центральной котельной средней мощности. Перспективным направлением в решении этой задачи является использование альтернативного источника электроэнергии в виде газопрошневой установки. Теплогенерирующие установки для централизованного теплоснабжения были рассчитаны с учетом минимального потребления электроэнергии и достижения надежности. Проведен анализ потребления электроэнергии оборудованием котельной установленной мощностью 4,7 МВт. Определены технические характеристики газопоршневой установки, выбранной в качестве нового источника электроэнергии. Проведены технико-экономические расчеты стоимости производства собственного электричества для котельной. Применение собственного источника электроэнергии позволяет снизить стоимость электроэнергии в сравнении с покупкой от центральных электросетей. Сделан вывод о том, что применение собственного альтернативного источника электроэнергии для котельной - это выгодное вложение для снижения финансовой нагрузки на теплоснабжающую организацию и для снижения стоимости тарифа на тепловую энергию. The problem of reducing cost of electricity consumption by the equipment of the central boiler house of medium capacity is considered. A promising direction in solving this problem is the use of an alternative source of electricity in the form of a gas-piston installation. Heat generating plants for district heating were designed taking into account the minimum electricity consumption and achieving reliability. We carried out the analysis of electricity consumption by the boiler house equipment with an installed capacity of 4.7 MW. The technical characteristics of the gas-piston plant selected as a new source of electricity were determined. As well we carried out technical and economic calculations of the cost of producing own electricity for the boiler house. The use of its own power source allows one to reduce the cost of electricity in comparison with the purchase from the central power grid. It is concluded that the use of its own alternative source of electricity for the boiler house is a profitable investment to reduce the financial burden on the heat supply organization and to reduce the cost of the heat energy tariff.