REDUCTION OF EFFECT ON ENVIRONMENT IN THERMAL

ENERGY SECTOR OF UZBEKISTAN WHILST SOLAR

ENERGY UTILIZATION.

A.I.Anarbaev

CAPACT Project

July 4-6July 4-6, 2007, , 2007, AlmatyAlmaty, , KazakhstanKazakhstan, , 4/6/20074/6/2007

Environment situation in Uzbekistan Legend:  

   Good

 

   Normal

 

   Moderate

 

  

Unsatisfactory 

   Extremal

energy sector18,8%

community32,2%

construction0,2%

municipal sector16,1%agricultural

sector0,2%

industry28,2%

losses4,3%

for final consumption

76,9%

Electro-stations27,2%

Boiler compart-

ments67,7%

Other sources

5,1%

Structure of sale and consumption of thermal energy in Uzbekistan

Emissions of thermal energy enterprises

• Amount of pollutant matters of thermal energy enterprises is equal to more than 200 thousand tones according to data of state statistic report.

• Total reduction of emissions to atmosphere is explained by change of fuel balance to the side of portion reduction of fired oil-fuel and increase of gas portion.

• 50% of carbon dioxide creating greenhouse effect goes into the atmosphere with emissions of pollutants from thermal energy enterprises at firing of fuel.

• Quantity of formed emissions of carbon dioxide depends on consumption and content of carbon in working mass of fired fuel.

Problems municipal energy sector• Dependant scheme of joining of the central heating

loading under open scheme of water intake;• Low efficiency of thermo generating equipment of small

boiler compartments; • Imperfect construction of heat-insulation of heat

distribution networks;• Intensive internal and external corrosion of pipe lines;• Absence of thermal energy metering devices;• Big thermal losses in buildings due to imperfectness of

construction and construction materials;• Number of organizational and economic problems, in

particular: – Unreasonable low level of tariffs; – Insufficient level of payments collection;- Lack of financial resources.

Helio-field of “Vodnik” boiler compartment in Tashkent

Boiler compartment with capacity of trap aggregates of 60 Gkal/h provides with central heating and hot water 98 apartment buildings, 66 municipal buildings and 4 plants (10 000 people)

Technological scheme of solar system of water heating for boiler compartments

Advantages of principal scheme of solar device of “Vodnik” boiler

compartment

• Heating in solar water heaters of most cold matter, therefore, achievement of highest efficiency of solar energy use and longer length of working season;

• The scheme allows directing through solar system all consumption volume of additional water which decreases final temperature of helio-heating;

• Solar water heaters are protected from corrosion in non-deaerated water due to limbation of the scheme.

Remote control and management of geliosistem solar-fuel boiler

Provides automatic management by using the required temperature at the outlet of geliotehniks part

Work and thermal efficiency of solar part of the boiler compartment

• Helio-system is implemented in type of helio-device to existing boiler compartment and serves for preliminary heating of additional water spent on needs of hot water supply, up to 25-35 0С.

• Up-heating to required temperature (65-700С) is implemented in traps, consuming gas

• According to the results of test exploitation from April to September at average temperature of helio-countour of 31-370С of average daily efficiency of helio-device was equal to 0,45÷0,63.

Indicators Size Amount

Total area of collectors m2 820

Generation of thermo per year MWth 900

Annual average figure of radiation

kWth/m2 1944

Specific production ability of sections

kWth/m2 1097,6

Annual decrease of gas consumption

Thou-sand m3

220

Substitution of fuel by helio-device

% 5-7

Exploitation characteristics of solar and fuel boiler compartment in “Vodnik”, 2003

Economic and environment indicators of boiler compartment “Vodnik”.

Indicators Size Amount

Capital investments Thousand EURO

192,73

Pay-back period years 10-12

Pollution emission reduction tones 2,4

Carbon dioxide emission reduction

tones 440

Area of helio-field of “Vodnik” boiler compartment with additional investments could be increased in 6 times and equal to 5 thousand m2. Substitution coefficient would be equal to about 30% from general annual thermal loading of boiler compartment.

Development of water solar and fuel boiler compartments in Uzbekistan

Object

Parameter

boiler compartment “Mashinostroitelnaya-2”, Tashkent

In village “Agalyk” of Samarkand line department of magistral gas pipe lines JSC “Uztransgaz”

Set up capacity of boiler compartment

25 Kkal/h 1,8 Gkal/h

Year of coming into operation of the helio-field

2005 2005

Area of the helio-field 50 m2 250 m2

Solar collectors on roof of boiler compartment “Mashinostroitelnaya-2”