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UDC 628.356.3:336.7
Bazhenov V. I., Berezin S. E., Ustiuzhanin A. V.
Feasibility of air blower house construction on the basis of life cycle costs evaluation
Summary
The demand of the wastewater treatment facilities for the controlled air-blowing equipment with a significant energy saving potential has been growing. Therefore the design concepts based on this type of equipment are attracting the investor’s interest. The aim of the study is economic analysis of the technologically controlled and uncontrolled air supply options for aeration systems of aeration tanks under the conditions of a newly built pumping-air blower house with and without account of the project investment attractiveness. Conditionally prescribed irregularity of air supply to the pneumatic aeration systems has been taken as a reference condition. The research method is economic analysis of the life cycle costs (LCC) including and without including the mechanism of time-variable cost adjustment, i. e. bank interest and inflation. Three options of an air-blowing house design are presented: without process control (multistage); with controlled electric drive (multistage); with the rotating-blade mechanism control (single-stage). During the construction of air-blowing houses the option with the introduction of single-stage rotating blade turbo blowers with dual control is most attractive. This option provides for the lower LLC index compared to the option of using a controlled electric drive for 23.07% – in case
the cost estimates do not include inflation and discount; and for 21% – in case the cost estimates use the mechanism of time-variable cost adjustment (with account of inflation and discount).
Key words
aeration system , air-blowing house , air blower control , economic analysis , life cycle costs , project investment attractiveness
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UDC 628.356.1:621.61
Posupon'ko S. V., Sagakov I. O., Butko A. V.
Optimization of the power consumption at the air blower house of «Rostov Wastewater Treatment Plant» Production Facility
Summary
The air blower house is the main electric consumer at the wastewater treatment facilities. Possible ways of energy saving at the Rostov Wastewater Treatment Plant are considered. With this purpose the measures aimed at the optimization of the operation of TSNV 800/1,6 centrifugal air pump were taken. As part of the studies the operation of the air blower house in winter period was investigated together with the possible power efficient mode of TSNV 800/1,6 centrifugal air pump operation using the method of gate valve throttling at the suction pipe. The tests showed that 60° opening the throttling vale provided for the most efficient operation of the blower. During the tests the stable and efficient operation of TSNV 800/1,6 blower at 90 to 60° reduction of the opening angle of the throttling valve with the reduction of the power consumption. Basing on the results of the studies the schedules determining the method of operation of the blowers at the wastewater treatment plant were developed.
Key words
sewerage treatment facilities , power saving , air-blowing house , centrifugal air pump , throttling valve
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UDC 628.356.1:621.61
Bitiev A. V., Basov N. S., Novikov S. N., Smolenskii A. V., Ustiuzhanin A. V., Bazhenov V. I.
Predicting energy-efficient effect of the controlled air delivery
at the Novo-Liuberetskie Wastewater Treatment Facilities
Summary
Стратегия развития АО «Мосводоканал» предусматривает
The corporate strategy of «Mosvodokanal» JSC envisages the systematic practical application of energy-efficient solutions substantiated by the method of mathematical prediction of the energy-efficient effect of the controlled air delivery at the air blower house of Block No. 1 of the Novo-Liuberetskie Wastewater Treatment Facilities in Moscow. The controlled air delivery to the aeration tanks for the biological wastewater treatment processes has been proposed as a key and cost effective method of energy conservation. The energy-efficient effect was determined by comparing the resultant energy consumption of two states of the predictable air deliver system – the basic state without control and controlled one. In the process of data and measurement method generation the calibrated metering devices of the operating SCADA system and data of the certified laboratory were used. The experimental survey of the air blower house with N750-23-6 units was carried out. The average decrease of air delivery resulting from the equipment deterioration for the 35 years’ operating period was 5.8–10.4%; the operation pressure decrease was 40.7–5.4%. The isoentropic coefficient of performance of N750-23-6 units was 75% at 79% rating. The method of predicting the energy-efficient effect including the mathematical model of energy input is considered. The model provided for 1.27% average ratio error at the verification against the actual environment of the operating object. The mathematical prediction of the energy-efficient effect revealed 32.5% or 11,343.97 thousand kWh/year reserve or 30,061.52 thousand ruble/year (VAT excluded) savings. Adjustable blade control of the air blowers was chosen as the technical basis of the energy efficiency. The study results formed the basis for the energy service contract.
Key words
energy efficiency , control arrangements , sewerage treatment facilities , simulation modeling , air-blowing house , rotary blade regulation , energy service contract , energy-efficient effect
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DOI 10.35776/VST.2021.04.06
УДК 628.336.6:620.97:621.515
Bazhenov V. I., Ustiuzhanin A. V., Koroleva Ekaterina
Cogeneration plants to compensate for the needs of wastewater treatment facilities in energy resources
Summary
The relevance of the work is associated with increasing the efficiency of the energy resources use. Commissioning water and wastewater treatment facilities with cogeneration dates back to 2009: Mosvodokanal JSC (Kurianovskie and Lyuberetskie treatment facilities, power 10 MW each), Vodokanal JSC, Ivanovo (2.55 MW), Cherepovets Vodokanal MUE (2.4 MW). The life cycle cost was determined on the basis of the operating costs subject to the constraints of the conditions of self-sufficient projects. The operating costs included: gas, electricity, heat energy, costs of spare parts, lubricant, personnel, etc. The use of gas engine cogeneration units to compensate for the needs of the wastewater treatment plants with blower units is an economically viable measure in the Russian Federation. This serves as the basis for the use of cogeneration units in projects of wastewater treatment plants located close to the main gas pipelines. Optimistic and pessimistic scenarios for the development of this area depend on the choice of vodokanals to use thermal energy. The cost of 1 m3 of wastewater treatment can be reduced: by 0.894/0.44 rubles for the operating blower units (with 28% excess energy consumption due to wear); by 0.644/0.317 rubles for the advanced blower units; by 0.688/0.361 rubles for the advanced controlled blower units. The benefit from using cogeneration units is 53.3%/36% and 56.9%/41% for uncontrolled and controlled blower units, respectively. It makes sense to consider capital costs at the design stage that includes specific, object-oriented requests for the equipment manufacturer.
Key words
biogas , cogeneration , wastewater aeration , air-blowing house , alternative energy supply , natural gas , engineering-economic analysis
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UDC 628.356.1:621.61
Rakitskii D. S., Egorova Yu. A., Levin D. I., Gordeev S. A., Nagornyi S. L., Bazhenov V. I., Petrov V. I., Ustiuzhanin A. V.
Energy-efficient principle of upgrading the air blower house at the Samara municipal wastewater treatment facilities
Summary
As a key and economically advantageous measure on energy efficiency and investment return in the field of wastewater disposal «Samarskie Kommunal’nye Sistemy» Company approves the processes of air supply regulation at the municipal wastewater treatment facilities. A big complex of the air blower house has been designed and successfully implemented by improving the typical design projects for the RF conditions developed by SoiuzvodokanalNIIproject Institute for the estimated supply of 132 144 Nm3/h. The specific features of building and assembly works when installing 15 ton units under the conditions of the limited capacity of the hoisting equipment (9 tons) are set. The mechanical rotary blade principle of fan regulation was adopted as a basis of the energy saving solution. At the first implementation stage under the conditions of the lack of an operating automated process control system 26.1% reduction of the specific power consumption was recorded at the average specific power consumption of 22.39 kW/1000 Nm3. The engineering design reflects possible 45–100% regulation of air supply to the aeration tanks as well as its relation to the consumed power of 1273.2–2674.2 kW (for 20 °C input temperature, 50% relative humidity). Two-loop scheme of the automated control system for «aeration tank gate valve control unit – blower unit group» is presented. The analysis of the fan testing at the manufacturer’s factory is given. The parameters of regulating centrifugal air blowers by two control actions: of regulated diffuser at the outlet and inlet guide vane unit are presented. The mathematical method of recalculating the characteristics of air blowers with the use of the «degree of control» basic concept was developed and experimentally verified. The use of the method proves the wide range of the running characteristics of regulated units for all the year seasons, the mode of combined operation of one non-regulated and three regulated air blower units for the experimental work period.
Key words
reconstruction , energy efficiency , simulation modeling , air-blowing house , wastewater treatment facilities , rotary blade regulation
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