ISSN: 2582-4686 SJIF 2021-3.261,SJIF 2022-
2.889, 2024-6.875 Resea chBib IF: 9.948 / 2024
VOLUME-5, ISSUE-11
858
LOW-TEMPERATURE HEATING SURFACE MODE OF THE BOILER
M.K. Tu suno , Y. Kholboe (Jizzakh Poly echnic Ins i u e)
Abs ac : This a icle analyzes low- empe a u e hea ing ski s made om boile s and aims o explo e
he p ac ical applica ion o hese echnologies. I se es o explo e ene gy e iciency by explaining
he p oduc ion p ocess and he en i onmen al impac o his ene gy p oduc ion me hod.
Key wo ds: boile , low- empe a u e hea ing su aces, economize , ai hea e , hea exchange ,
empe a u e dis ibu ion, gas consump ion, he mal e iciency, s age a angemen .
Аннотация. В данной статье рассмотрен анализ низкотемпературных нагревательных юбок из
кoтла и поставлена цель изучить применение технологий на практике. Статья служит для
изучения энергоэффективности путем объяснения производственного процесса и воздействия
этого метода получения энергии на окружающую среду.
Ключевые слова: котел, низкотемпературные поверхности нагрева, экономайзер,
воздухоподогреватель, теплообменник, распределение температуры, расход газа, тепловая
эффективность, расположение ступеней.
The e a e wo main schemes o he ela i e posi ioning o he economize and ai hea e :
1) sequen ial placemen , when he economize is loca ed i s in he di ec ion o combus ion p oduc s,
ollowed by he ai hea e ;
2) a wo-s age a angemen , in which he combus ion p oduc s i s pass h ough he uppe pa o he
ai hea e and hen h ough hei lowe pa s.
The wo-s age a angemen o he ail hea ing su aces somewha complica es he boile design. Long
ai bypass duc s a e equi ed. Wi h a wo-s age design, he ai p ehea e and economize a e spli in o
wo s ages.
The las hea ing su ace along he gas low is s ill he ai hea e .
The change in empe a u e o he gases and wo king luid along he low- empe a u e hea ing su aces
is shown in Figu e 1. As he ai hea s up, i s empe a u e app oaches he empe a u e o he gases; he
opposi e is ue o wa e . As can be seen om Figu e 1, he minimum empe a u e di e ence be ween
he hea ing and hea ed luids is obse ed a he "ho " end o he ai hea e ∆ 𝑚
𝑣𝑝and he "cold" end o
he economize ∆ 𝑚
𝑒𝑘. This beha io o he empe a u e cu es ollows di ec ly om he hea balance
equa ions.
In pa icula , o he i s s age o he ai hea e , he hea balance equa ion has he ollowing o m:
(𝑡г.в. − 𝑡х.в.)𝜔в= (𝜗г− 𝜗ух)𝜔г (1)
Whe e 𝑡х.в.; 𝑡г.в.— ai empe a u e a he inle and ou le o he ai hea e , °C; 𝜗г, 𝜗ух— empe a u e
a he inle and ou le o he i s s age o he ai hea e , °C; 𝜔в, 𝜔г— wa e equi alen s o he olumes
o ai and gases, ela ed o 1 kg o uel, kJ/(kg • deg).
ISSN: 2582-4686 SJIF 2021-3.261,SJIF 2022-
2.889, 2024-6.875 Resea chBib IF: 9.948 / 2024
VOLUME-5, ISSUE-11
859
Fig. 1. Change in empe a u e o gas
and wo king luid along low-
empe a u e hea ing su aces
The alues o wa e equi alen s o ai and gases a e espec i ely equal o: o ai
𝜔в= (𝛼т− ∆𝛼т− ∆𝛼пл.у)𝑉
в0св(2)
o gas
𝜔г= 𝑉𝑅𝑂2𝑐𝑅𝑂2+ 𝑉𝑁2𝑐𝑁2+ (𝛼ух − 1)𝑉
в0св+ 𝑉𝐻2𝑂𝑐𝐻2𝑂(3)
The olume o gases is g ea e han he olume o ai due o he p esence o wa e apo ob ained
om he uel mois u e and du ing he combus ion o hyd ogen, and he suc ion o ai in o he u nace
and lues o he boile . In addi ion, he hea capaci y o gases is g ea e han ha o ai . The e o e, as
can be seen om equa ions (2) and (3), he wa e equi alen o gases is always g ea e han ha o
ai . F om equa ion (1) i ollows ha he 𝜔в< 𝜔г inc ease in ai empe a u e is g ea e han he
co esponding dec ease in gas empe a u e. The wa e equi alen o wa e , e e ed o 1 kg o uel
and equal o
𝜔вод =(𝐷 𝐵
⁄ )𝑐р [kJ/( kg · deg )],
gases ha e a highe wa e equi alen , so he empe a u e cu es in he economize egion di e ge (see
Fig. 1).
I in equa ion (1) he empe a u e o he gases be o e he i s s age o he ai hea e and he
empe a u e o he ho ai a e exp essed h ough ∆𝑡м
вп and ∆𝑡м
эк, hen we ob ain:
𝑣𝑟= 𝑡пв+ ∆𝑡м
эк;
𝑡гв= 𝑣𝑟– ∆𝑡м
вп.
The op imum empe a u e o he ho ai behind he i s s age o he ai hea e can be ob ained om
equa ions (1) and (3):
∆𝑡гв= 𝑡пв+ ∆𝑡м
эк– ∆𝑡м
вп.
I we subs i u e he alues o he minimum empe a u e di e ences ob ained abo e in o his equa ion,
we will ha e:
𝑡гв= 𝑡пв+ (10 –15) ℃.
This ecommenda ion is o en used when b eaking down he hea d op be ween he s ages o an ai
hea e .
Li e a u e
1. Zhdano V. G. Boile Plan s and S eam Gene a o s. Moscow: Ene goa omizda , 2015. 472
p.
ISSN: 2582-4686 SJIF 2021-3.261,SJIF 2022-
2.889, 2024-6.875 Resea chBib IF: 9.948 / 2024
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2. Ku gano V. M. Hea Exchange s o Boile Plan s. Sain Pe e sbu g: Poli ekhnika, 2016.
288 p.
3. Malyshe V. I. The mal Calcula ions o Boile s and Hea Exchange Su aces. Moscow:
Mashinos oenie, 2017. 390 p.
4. Boyko A. I. Hea T ans e and Hyd odynamics in Boile Uni s. Kyi : Tekhnika, 2019. 312
p.
5. ASHRAE Handbook – HVAC Sys ems and Equipmen . – A lan a: Ame ican Socie y o
Hea ing, Re ige a ing and Ai -Condi ioning Enginee s, 2021.
6. Inc ope a, F. P., DeWi , D. P. Fundamen als o Hea and Mass T ans e . – 8 h ed. –
Hoboken: Wiley, 2020. – 1065 p.
