Analysis of a jet-pump-assisted vacuum desalination system using power plant waste heat

Kumar, R. Senthil; Mani, A.; Kumaraswamy, S.

doi:10.1016/j.desal.2004.11.081

Cited by 39 publications

(11 citation statements)

References 9 publications

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“…Eq. (8) indicates that the pressure gradient VP increases with raising outlet pressure P d , promoting the gaseliquid interface to move upstream. Table 1.…”

Section: Pressure Distribution Along the Jet Pumpmentioning

confidence: 98%

“…Jet pump is one kind of fluid machinery and mixing equipment that absorbs liquid automatically under the action of negative pressure [4]. With advantages of no moving parts, low maintenance, simple compact and easy to install [5], it has been widely used in oil and gas industry for producing suction to increase their production [6,7] and in the desalination of water [8,9]. However, since the liquid absorption is closely related to the negative pressure formed in the jet pump, which is affected by the downstream pressure [10], the absorption amount and proportion are variable when the downstream pressure changes.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental investigation on liquid absorption of jet pump under operating limits

Wang

Shen

et al. 2015

Vacuum

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“…Eq. (8) indicates that the pressure gradient VP increases with raising outlet pressure P d , promoting the gaseliquid interface to move upstream. Table 1.…”

Section: Pressure Distribution Along the Jet Pumpmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Experimental investigation on liquid absorption of jet pump under operating limits

Wang

Shen

et al. 2015

Vacuum

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“…The fluid then enters the liquid-gas jet pump (6) through the pipeline (5). Gas enters through the inlet (8), passes through the inlet pipe (9) and the float flowmeter (10), and is controlled by the inlet valve (11). The gas is mixed with the working fluid in the pressure-stabilizing tank (12), and the mixed liquid is passed through the diffuser pipe (7) before being discharged back into the water tank for recycling.…”

Section: Experimental Setup and Instrumentsmentioning

confidence: 99%

“…Additionally, Witte [4] employed a 19-nozzle multi-jet structure and conducted experimental comparisons under various operating conditions, ultimately achieving an isothermal compression ratio of 40%. Kumar [9] applied liquid-gas jet pumps to seawater purification systems and conducted related experimental research. The results indicated that the pump's performance reached an optimum value when the nozzle-to-throat entrance distance was 33 mm.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Performance of Liquid–Gas Jet Pump with Square Nozzle

Xu,

Mou,

Zhang

et al. 2023

Energies

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An experimental study is conducted to investigate the effects of different operating parameters on the performance of liquid–gas jet pumps. A square nozzle with an area ratio of 2.25 is designed for the liquid–gas jet pump, and an experimental setup for the liquid–gas jet pump system is constructed. By varying parameters such as inlet flow rate, temperature, and inlet pressure, the variations in the pumping capacity and pumping ratio of the system are studied. The performance of liquid–gas jet pumps with square nozzles and traditional circular nozzles under the same working conditions was compared through experimental data. Explore the performance advantages and disadvantages of liquid–gas jet pumps with different shaped nozzles under the same working conditions. The experimental results indicate that as the inlet flow rate of the liquid–gas jet pump increases, the pumping capacity of the system increases, leading to an increase in the pumping ratio. The operational efficiency slightly decreases with a rise in the working water flow rate. The pumping ratio of the system increases with an increase in the inlet pressure, reaching a peak value of around 4.0 when the inlet valve is fully open. Inlet pressure significantly affects the efficiency of the liquid–gas jet pump, with the highest efficiency point achieved at Pa (inlet air pressure) = 60 kPa, reaching an operational efficiency of 42.48%. When Pa exceeds 70 kPa, the operational efficiency rapidly declines. Comparing the performance of square and circular nozzle liquid–gas jet pumps under the same operating conditions, the performance of the square nozzle liquid–gas jet pump outperforms that of the circular nozzle counterpart. The pumping system’s performance decreases continuously with an increase in the working liquid temperature; however, the decline in pumping performance becomes gradual after exceeding 40 °C. As the water level rises, both the pumping capacity and pumping ratio of the system increase. After the liquid level reaches 40 cm, the changes in the pumping system’s performance become less pronounced.

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“…AI-Shammiri 18 reported that the evaporation rate decreases with an increase of water salinity due to the vapor pressure drop near the water surface. Mani et al 19 presented a vacuum desalination system using waste heat rejected by power plant. The results of simulation showed an improvement in distillate production of the system with reduction of condenser temperature and chamber pressure.…”

Section: Introductionmentioning

confidence: 99%

A novel vacuum wastewater treatment plant integrated with a solar absorption system

Saleh

Al‐Nimr

2019

Int J Energy Res

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Summary In this investigation, a novel use of the solar absorption refrigeration systems was introduced by using it to enhance the operation of vacuum wastewater treatment plant. Wastewater treatment systems require a source of heat for evaporation, a cooling section for condensation and a mean of evacuation to facilitate evaporation. The solar absorption system can take over the first two tasks. Among the commercially available vacuum evaporators, one was selected and modified by replacing the conventional heat pump with the solar absorption system. Two validated mathematical models available in the literature, one for solar absorption subsystem and one for vacuum evaporation subsystem, were integrated together to perform the analysis. The impacts of solar absorption subsystem parameters along with vacuum evaporator subsystem parameters on the overall performance were investigated using the developed program. System performance was evaluated in terms of evaporation rate and condensate rate production. It was found that the degree of superheat had the greatest impact on the rate of evaporation. At low levels of supply temperature to the vacuum chamber, using only heat provided by the absorption system, the evaporation rate exceeded 60 kg/h. If the hot water was further heated by passing through the solar collector storage tank, the evaporation rate exceeded 200 kg/h.

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Analysis of a jet-pump-assisted vacuum desalination system using power plant waste heat

Cited by 39 publications

References 9 publications

Experimental investigation on liquid absorption of jet pump under operating limits

Experimental investigation on liquid absorption of jet pump under operating limits

Experimental Study on Performance of Liquid–Gas Jet Pump with Square Nozzle

A novel vacuum wastewater treatment plant integrated with a solar absorption system

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