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Correlation between air flow rate and pollutant concentrations during two-stage oak log combustion in a 25 KW residential boiler

Marek Juszczak
Chemical and Process Engineering | 2016 | vol. 37 | No 3 September | 419-428 | DOI: 10.1515/cpe-2016-0034
Słowa kluczowe wood combustion pollutant emission heating boiler heat station
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Abstrakt

It can be expected that there is a considerable correlation between combustion air flow rate and the concentrations of carbon monoxide, hydrocarbons and nitrogen oxide in the flue gas. The influence of temperature and oxygen concentration in the combustion zone on the concentrations of carbon monoxide, hydrocarbons and nitrogen oxide in the flue gas, for high and low combustion air flow, was analysed. Oxygen concentration for which the concentration of carbon monoxide is the lowest was determined, as well as the mutual relation between carbon monoxide and nitrogen oxide concentration.

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Autorzy i Afiliacje

Marek Juszczak

Mathematical model of the intensification of convective heat transfer in a bundle of smooth pipes using petal tubulators

Jiyenbeck Sugirov Bibigul Atshybayeva Marzhan Suimenova Kulanda Shaikhiyeva Gulbanu Yesbolay
Polityka Energetyczna - Energy Policy Journal | 2023 | vol. 26 | No 1 | 93-110
Słowa kluczowe turbulence heat boilers increased heat transfer flow friction swirling flow
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Abstrakt

The relevance of this study is explained by the growing interest in increasing heat transfer by the development of high-performance thermal systems. Increasing the thermal characteristics of heat-exchanger systems is necessary for the efficient use of an energy source. The purpose of this study is to review the existing methods of heat-transfer intensification and examine the mathematical model of such an increase in efficiency when using petal turbulators. This study is based on a high-quality, reliable combination of proven theoretical methods (analysis, synthesis, concretization, generalization, modelling), and empirical methods. It is the introduction of turbulators into the flow channel that is one of the best methods of increasing passive heat exchange through such advantages as ease of manufacture and operation in combination with low operating and production costs. This study contains both passive and active methods of heat-exchange intensification that have been extensively investigated over the past decade. For this purpose, the newest studies of mainly authors from other countries were used, their detailed analysis was conducted and the results were summed up. In addition, a mathematical model of increasing the thermal efficiency of convective heating surfaces in a bundle of smooth pipes using petal turbulators was investigated, the results of which were tested on an experimental installation. The paper may interest a circle of readers interested in the problem of improving the thermal characteristics of heat exchangers, including researchers, teachers and students of higher educational institutions in the field of heat-power engineering.
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Autorzy i Afiliacje

Jiyenbeck Sugirov
1
Bibigul Atshybayeva
2
Marzhan Suimenova
1
Kulanda Shaikhiyeva
1
Gulbanu Yesbolay
1
  1. Department of Construction Engineering, Caspian University of Technology and Engineering named after Sh. Yessenov, Republic of Kazakhstan
  2. Department of Energy and Transport, Caspian University of Technology and Engineering named after Sh. Yessenov, Republic of Kazakhstan

Dywersyfikacja źródeł energii w Kazachstanie jako sposób na złagodzenie skutków przewidywanego kryzysu

Aiganym Seidaliyeva Sherniyaz Kabdushev Saltanat Baipakbayeva Eldar Kopishev Ibragim Suleimenov
Polityka Energetyczna - Energy Policy Journal | 2024 | vol. 27 | No 1 | 173-188
Słowa kluczowe kryzys energetyczny energia na małą skalę downshifting kocioł grzewczy odnawialne źródła energii
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Abstrakt

W artykule ukazano, że przewidywany kryzys energetyczny w Kazachstanie sprawia, że kwestia małej energetyki i komplementarnych instytucji społeczeństwa obywatelskiego staje się bardziej aktualna. Kryzys ten, spowodowany pogorszeniem sieci ciepłowniczych budowanych w czasach byłego ZSRR, może mieć więcej niż dużą skalę, o czym świadczą wydarzenia w mieście Ekibastuz, gdzie znaczna część ludności została zimą 2022/2023 pozbawiona ogrzewania. Udowodniono, że rozwój małej energetyki powinien być złożony, tj. w dającej się przewidzieć przyszłości należy skupić uwagę na łączeniu odnawialnych i tradycyjnych źródeł energii, co oznacza stopniowy wzrost udziału energii odnawialnej. Uzasadniona jest celowość stosowania pojęcia „wolności energetycznej”, przynajmniej w odniesieniu do Republiki Kazachstanu. W artykule pokazano, że celem rozwoju małej zielonej energii powinno być właśnie osiągnięcie wolności energetycznej gospodarstw domowych, zorientowanej na instytucje społeczeństwa obywatelskiego. Oznacza to, między innymi, rozwój szerokiej gamy nietypowych rozwiązań technicznych, które zapewniają, na przykład, bezpośrednie wytwarzanie ciepła bez pośredniego etapu konwersji na prąd elektryczny. W artykule rozważono konkretny przykład wykazujący adekwatność proponowanego podejścia. Pokazano także, że podstawowe działania zapewniające wolność energetyczną gospodarstw domowych można realizować nawet przy wykorzystaniu dostępnych na rynku urządzeń. Przedstawiono konkretne obliczenia, które dowodzą, że przejście na zdecentralizowane dostawy ciepła jest ekonomicznie wykonalne przy użyciu dostępnego sprzętu.
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Autorzy i Afiliacje

Aiganym Seidaliyeva
1
ORCID: ORCID
Sherniyaz Kabdushev
2
ORCID: ORCID
Saltanat Baipakbayeva
2
ORCID: ORCID
Eldar Kopishev
3
ORCID: ORCID
Ibragim Suleimenov
4
ORCID: ORCID
  1. NJSC “Almaty University of Power Engineering and Telecommunications named after Gumarbek Daukeev”, Kazakhstan
  2. International IT University, Kazakhstan
  3. L.N. Gumilyov Eurasian National University, Kazakhstan
  4. Academician of National Engineering Academy of RK, Kazakhstan

Combustion of wood pellets in a low-power multi-fuel automatically stoked heating boiler

Wiesław Zima Grzegorz Ojczyk
Archives of Thermodynamics | 2022 | vol. 43 | No 1 | 169-184 | DOI: 10.24425/ather.2022.140930
Słowa kluczowe Multi-fuel heating boiler wood pellets Substitute fuel Thermal tests Boiler optimal operating points
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Abstrakt

This paper presents a test stand equipped, among others, with two boilers intended for the combustion of solid fuels. The first is a single-fuel boiler designed to burn wood pellets only. The second is a multi-fuel boiler intended for the combustion of mainly hard coal (basic fuel) with the grain size of 0.005–0.025 m. Wood pellets can also be fired in this boiler, which in such a case are treated as a substitute fuel. There is a developed and verified algorithm for the control of the multi-fuel boiler operation in a wide range of loads for the basic fuel. However, for the substitute fuel (wood pellets) there are no documented and confirmed results of such testing. The paper presents selected results of testing performed during the combustion of wood pellets in a multi-fuel automatically stoked boiler. Several measuring series were carried out, for which optimal operating conditions were indicated. These conditions may serve as the basis for the development of the boiler operation control algorithm. A detailed analysis was carried out of the flue gas temperatures obtained at the outlet of the boiler combustion chamber and of the contents of carbon monoxide and oxygen in the boiler flue gases.
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Bibliografia

[1] Announcement of the Sejm Speaker of the Republic of Poland on the promulgation of a consolidated text of the Act on renewable energy sources. Journal of Laws – Republic of Poland (Dziennik Ustaw Rzeczypospolitej Polskiej) 2021, Item 610 (in Polish).
[2] Regulation of the Minister of Development and Finance on the requirements for solid-fuel boilers. Journal of Laws – Republic of Poland (Dziennik Ustaw Rzeczypospolitej Polskiej) 2017, Item 1690 (in Polish).
[3] EN 303-5:2021: Heating boilers – Part 5: Heating boilers for solid fuels, manually and automatically stoked, nominal heat output of up to 500 kW – Terminology, requirements, testing and marking.
[4] Poland’s Energy Policy until 2040. Ministry of Climate and the Environment, Appendix to Resolution 22/2021 of the Council of Ministers, 2021 (in Polish).
[5] Commission Regulation (EU) 2019/2146 amending Regulation (EC) 1099/2008 of the European Parliament and of the Council on energy statistics, as regards the implementation of updates for the annual, monthly and short-term monthly energy statistics. OJ L 325, 16.12.2019.
[6] Directive (EU) 2018/2001 of the European Parliament and of the Council on the promotion of the use of energy from renewable sources. OJ L 328, 21.12.2018.
[7] Zima W., Ojczyk G.: Current status and prospects for solid multi-fuel boilers of low power. Rynek Energii 5(2013), 108, 50–56 (in Polish).
[8] Juszczak M., Pałaszynska K., Rolirad K., Janicki M., Szczechowiak E.: Attempt to use additives increasing ash melting point while firing agricultural biomass pellets in order to avoid slag production in the furnace. Ciepłownictwo, Ogrzewnictwo, Wentylacja 48(2017), 8, 320–326 (in Polish).
[9] Ciupek B., Urbaniak R., Judt W.: Experimental research of changes in co, nox and pm concentrations in flue gases during combustion of wood pellets with wheat seeds. Ciepłownictwo, Ogrzewnictwo, Wentylacja 50(2019), 2, 56–61.
[10] Orłowska A., Sroka K.: Changes in legal regulations concerning supplying households with heat. Rynek Energii 140(2019), 1, 38–47.
[11] Zima W., Ojczyk G.: Analysis of combustion of wood pellets as a substitute fuel in a low-power boiler. Arch. Combust. 35(2015), 2, 117–130.
[12] Ziebik A., Stanek W.: Energy effciency – selected thermo-ecological problems. Arch. Thermodyn. 41(2020), 2, 277–299.
[13] https://www.herz-energie.at/pl/ (accessed 6 Sept. 2021).
[14] http://www.ogniwobiecz.com.pl/ (accessed 12 Sept. 2021).
[15] Ecological Safety Mark: Certificate 1035. Inst. Chem. Process. Coal, Zabrze 2009 (in Polish).
[16] https://www.keison.co.uk/ (accessed 17 Aug. 2021).
[17] Kuznetsov N.V., Mitor V.V., Dubovsky I.E., Karasina E.S. (Eds.): Thermal Calculation of Steam Boilers. Normative Method (2nd Edn.). Energia, Moscow 1973 (in Russian).
[18] Rutkowski Ł., Szczygieł I.: Calculation of the furnace exit gas temperature of stoker fired boilers. Arch. Thermodyn. 42(2021), 3, 3–24.


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Autorzy i Afiliacje

Wiesław Zima
1
Grzegorz Ojczyk
2
  1. Cracow University of Technology, Department of Energy, al. Jana Pawła II 37, 31-864 Kraków, Poland
  2. MTHE Modern Technologies in Heating Engineering, Młynska-Boczna 7/2, 31-470 Kraków, Poland

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