Algorithmic tools for optimizing the temperature regime of evaporator at absorption-refrigeration units of ammonia production

Babichenko, Anatoliy; Kravchenko, Yana; Babichenko, Juliya; Красніков, Ігор Леонідович; Lysachenko, Ihor; Velma, Vladimir

doi:10.15587/1729-4061.2018.139633

Cited by 2 publications

(3 citation statements)

References 6 publications

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“…Under such conditions, the solution degassing zone will increase and the efficiency of the heat exchange process in the generator will increase. At the same time, the pressure value at the point of entry of the solid solution to the generator and the pressure difference in the generator cube and at the outlet of the rectifier, which is due to hydrodynamics, were calculated according to the equation given in [12]. Removal of steam from the dephlegmator scheme with a strong solution will result in a decrease in the temperature of the weak solution at the absorber inlet to a value of no more than 43 °С (67 °С according to the project) and a decrease in the heat load on the absorber.…”

Section: The Study Materials and Methodsmentioning

confidence: 99%

“…The occurrence of such a situation is clearly illustrated by such a concept as the multiplicity of circulation of solutions f, which largely characterizes the work of ARU [7]. The value f is determined by the ratio of the difference in ammonia concentrations in the water-ammonia vapor from the dephlegmator (rectifier) ξ df and weak solution ξ a to the degassing zone, which is the difference in ammonia concentrations in strong ξ r and weak ξ a water-ammonia solutions.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…where q K is the specific heat of condensation, kJ/kg; q R -specific heat of the rectifier, kJ/kg; R is the mass fraction of phlegm in the rectifier; 1 1 i -enthalpy of the solution after the generator, kJ/kg; 0 1 i -enthalpy of the solution at the beginning of boiling in the generator, kJ/kg; P 1 -steam pressure after the generator, MPa; i 5 -enthalpy of refrigerant vapor from the rectifier, kJ/kg; i 6 -enthalpy of liquid refrigerant at the outlet of the subcooler, kJ/kg; 5 , ξ The results of material and thermal calculations for the proposed version of ARU, taking into account formulas (3) to (12), are given in Table 3.…”

Section: Determining Efficiency Indicators Of the Constructed Equipme...mentioning

confidence: 99%

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Designing energy-efficient hardware and technological structure of absorption refrigeration units for ammonia production

Babichenko,

Krasnikov,

Babichenko

et al. 2024

EEJET

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The object of research is the equipment and technological design of absorption refrigeration units (ARUs) for the technological system of secondary condensation of large-scale ammonia production. Improving the energy efficiency of ARU is an urgent problem in the general process of reducing operating costs for natural gas in these industries as a whole. Based on the results of analytical studies, the feasibility of combining absorption-refrigeration and vapor-ejector cycles was substantiated, which ensures a decrease in the boiling temperature of a weak water-ammonia solution in the cube of the generator-rectifier and an increase in the condensation pressure in the ARU cycle. Under such circumstances, it becomes possible to increase the concentration of the refrigerant due to the rectification of steam with a part of the liquid refrigerant without using a pump with the removal of the dephlegmator from the ARU circuit. Experimental studies and material-thermal calculations of ARU cycles were carried out to determine the basis of comparison and the proposed version of the ARU scheme. It has been proven that the new technological design of ARU provides an increase in cooling capacity from 3.22 MW to 3.6 MW (by 12 %), the thermal coefficient from 0.527 to 0.551 (by 4.6 %), a decrease in the circulation ratio from 7.77 to 7.1 (by 8 %), and a decrease in the secondary condensation temperature by 2.5 ℃. It is shown that for the proposed version of the technological design of ARU, there is a change in specific costs – an increase in electricity by 1.48 kWh/t NH3 and a decrease in natural gas by 0.41 nm3/t NH3. Taking into account existing cost indicators for natural gas and electricity, the application of the proposed technology ensures a decrease in annual operating costs by UAH 7 million (USD 185,000), and therefore an increase in the economy of ammonia production as a whole

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Section: The Study Materials and Methodsmentioning

confidence: 99%

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Section: Determining Efficiency Indicators Of the Constructed Equipme...mentioning

confidence: 99%

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Designing energy-efficient hardware and technological structure of absorption refrigeration units for ammonia production

Babichenko,

Krasnikov,

Babichenko

et al. 2024

EEJET

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Аналіз Основних Складових Похибки Визначення Твердості За Методом Брінелля З Використанням Оптичних Систем

Коржов¹,

Кравченко²,

Борисенко³

2021

zhnups

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У статті приведено загальний алгоритм для визначення твердості за Брінеллем для вимірювальних приладів з оптичною системою на основі положень міжнародного стандарту ISO 6506, отримана результуюча формула для розрахунку твердості за Брінеллем для вимірювальних приладів з оптичною системою. На основі результуючої формули для розрахунку твердості отримані та проаналізовані абсолютна та відносна похибка, а також їх складові. Наведено теоретичний аналіз основних величин, що впливають на точність визначення твердості за методом Брінелля та шляхи їх зменшення для вимірювальних приладів з програмним забезпеченням для розрахунків та оптичною системою для вимірювання параметрів відбитку індентора. Приведений теоретичний аналіз складових похибок визначення твердості за методом Брінелля та шляхи їх зменшення, дають змогу більш детально оцінити похибку визначення твердості та мінімізувати вплив деяких складових відповідного устаткування для вимірювання твердості.

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Algorithmic tools for optimizing the temperature regime of evaporator at absorption-refrigeration units of ammonia production

Cited by 2 publications

References 6 publications

Designing energy-efficient hardware and technological structure of absorption refrigeration units for ammonia production

Designing energy-efficient hardware and technological structure of absorption refrigeration units for ammonia production

Аналіз Основних Складових Похибки Визначення Твердості За Методом Брінелля З Використанням Оптичних Систем

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