Power potential of different power mediums is considered from point of choice of supplier, the teploenergeticheskie indexes of widespread power mediums are resulted. The cost of receipt of one kilowatt of thermal or electric energy, contained in basic power mediums is expected, depending on a market price them. For comfort of using tabular information graphic interpretation of findings is resulted.

The change of cost of basic power mediums (natural gas and oil) results in the questions of cost estimation of basic and alternative power mediums. For comparison and estimation of cost of energy of primary power mediums this methodology is developed. It allows to estimate current expenses on power mediums and get a prognosis at a change a cost them in the future.

This approach is an evaluation, for more exact prognosis it is necessary to know exact teplofizicheskie information of concrete power medium and change of their indexes in the future. For example, at replacement of supplier oil or gas of teplofizicheskie property them can differentiate considerably. It is therefore necessary to enter in calculations the cost of thermal equivalent of power medium of type of Britannic thermal unit (BTU), but not cost of ton or м3.

The same problem touches the suppliers of natural gas from gazokondensatnykh deposits. Gas-transport enterprises accept gas in м3, but not in calories or joules.

For the analysis of cost indexes of basic primary power mediums will accept lower calorie content them from next usrednennym data, to resulted in a table 1.
Table 1

The higher heating value of fuel is not examined, because there can be different terms of cooling of products of combustion for the receipt of the condensed moisture.

In calculations for comparison the size of expenses is accepted in the cents of the USA on the receipt of 1 kW*h energy (electric or thermal) without the account of efficiency of the use of potential energy of the power mediums resulted higher. It will allow to estimate the expenses of facilities on acquisition of primary power mediums.

We will mark that for the receipt of electric power KPD of different drives can be from 18 to 60 %. Thermal energy can be got with KPD 80-97 %.

The results of calculations are resulted in a table 2.

The followings properties of power mediums are accepted: a closeness of oil and fuel oil is 0,8 kg/l (limits are from 0,76 to 0,85 kg/l), a closeness of ethanol is 0,79 kg/l, closeness of generator gas - 0,943 кг/ст.м3, the ton of oil makes 7,863118 barrels (A barrel is 158,97 l).

For example, 1 kW*h of primary energy at price 3 cents can be got from oil by a cost $346  for a 1 ton, fuel oil for 332 $/ton, coal brown for 117 $/ton, coal stone for 208 $/ton, ethanol for 213 $/ton, natural gas after 276 doll after 1 000 м3, sintez-gaza for 52 $/ton, gas of generator 130 $/ton, tons of conditional fuel of 243 $/ton.

From other side, it is possible to be oriented on the cost of one of power mediums and compare expenses on other power mediums. For example, at the cost of oil of 62 dollar/barel = a 487,51 $/ton cost of one кВт.ч will be 4.3 cent. At the same price it is possible to purchase fuel oil at the cost of him 473 $/ton, natural gas - 393 долл/1000 м3, ton of conditional fuel - 346 $/ton, ethanol - 306 $/ton, coal stones - 298 $/ton, gas is a generator - 186 $/ton, coal is brown - 168 $/ton, synthesis-gas - 74 $/ton.

These examples show that at the cost of oil of 62 долл/б natural gas must have a cost of 393 долл/1000 м3 for the receipt of the same amount of energy.

If to take for basis coal stone at price of 70 $/ton, it will correspond the cost of natural gas of 90 $/1000 м3 or 14,625 dollar/barel oils. But coal requires preliminary preparation to incineration and expenses on zoloudalenie and cleaning of products of combustion unlike natural gas.

We pay attention, that the resulted evaluation information behave to efficiency of the use of power mediums 100 %, actually efficiency will be considerably less than for every type of power medium..

  26.02.2008