Politechniki Slaskiej w Gliwicach

Poland

Politechniki Slaskiej w Gliwicach

Poland
SEARCH FILTERS
Time filter
Source Type

In many industrial processes the common by-products are flue gases with diverse low heating value. One of such by-products is coke-oven gas. These gases depending on the needs and possibilities are utilized directly in industrial units, lowering the consumption of standard high-calorie fuels which increases the efficiency of the actual industrial processes. The surplus of such by-products can be utilized in an energy-efficient way. The article presents an energy assessment of an exemplary CHP unit equipped with a gas piston engine with power of 2.9 MW powered with coke-oven gas and an exemplary unit equipped with steam boiler and steam turbine to produce electrical energy with power of 71 MW. The energy assessment has been conducted on the basis of a developed model which encompasses mass and energy balance equations formulated for the particular devices. Moreover, energy assessment indicators which characterize the efficiency of units to produce electrical energy and heat also have been calculated. Calculation results have been presented in enclosed tables. On the basis of obtained calculation results, appropriate conclusions have been formulated.


Gas Turbine Combined Cycle power plants are a one of the most efficient energy conversion systems. These systems encompass gas turbine cycle, steam turbine cycle and heat recovery steam generator. Electric power of Gas Turbine Combined Cycle power plant heavily depends on ambient parameters - mainly on temperature. A variation of ambient parameters changes compressor working point, hence temperature and stream of flue gas leaving gas turbine can be changed. In consequence, boiler efficiency and steam flow and parameters can also be changed. The article presents a numerical analysis of influence of ambient parameters on energy exploitation indicators of gas turbine and double pressure heat recovery steam generator. Effect of variation of ambient temperature on gas turbine power, flue gas stream and temperature at the outlet of turbine was modelled with the use of correction curves. Mathematical model of heat recovery steam generator is based on mass and energy equations and additional equations which describe heat transfer process. Unknown empirical parameters which occur in in empirical equations are taken from the literature. The calculation method and exemplary calculation results are presented.


Milejski A.,Politechniki Slaskiej w Gliwicach | Rusinowski H.,Politechniki Slaskiej w Gliwicach
Rynek Energii | Year: 2010

Dusty gases, which temperature exceed 1000°C, are often a result of processes occurring in the technological furnaces. They contain combustible components, mainly carbon monoxide. Gases from the shaft, anode or electric furnace in copper metallurgy are examples of such products. Process gases require afterburning, cooling and dust removal in order to dispose them. The afterburning process takes place in the afterburning chamber or in the channel from waste heat boilers. Then gases are cooled in water and/or atmospheric coolers. Dedusting takes place in electrostatic precipitator, bag filters or cyclones. The efficiency improvement of disposal process is very important to reduce the energy consumption of technological processes. However, it requires the determination of optimal parameters for afterburning and cooling. Inappropriate afterburning parameters may lead to incomplete combustion. The excess of air increases the amount of gases and power of exhaust fans. The paper presents the method and results of the mathematical modeling of afterburning process of gases from electric furnace in copper smelter. The mathematical model of the afterburning chamber was created using Fluent CFD package. This software allows to simulate physical and chemical phenomena in fluid mechanics.


Zinc is mainly produced in the pirometalurgical process that uses Imperial Smelting Technological Process (ISP). In this process, two main phases can be distinguished: preparation of sinter and reductive fusion of sinter in a shaft furnace. A by-product of zinc production process is low-calorific dust-containing gas from the shaft furnace. The lower heating value of the gas is about 3-3.8 MJ/Nm3. Currently, by-produced gas is commonly used in the blast heaters, and the excess is combusted and released into the atmosphere. The paper presents possibilities of low-calorific by-produced gas utilization to generate both electricity and heat in the gas turbine and internal combustion engines. Moreover the possibility of gas utilization to produce coolness in absorption chillers is presented. The paper presents a detailed analysis of usability of by-produced gas from shaft furnace for zinc smelter conditions.


Rusinowski H.,Politechniki Slaskiej w Gliwicach | Pluta L.,Politechniki Slaskiej w Gliwicach | Milejski A.,Politechniki Slaskiej w Gliwicach
Rynek Energii | Year: 2010

Gases with a low-heating value of 1.2 ÷ 18 MJ/Nm3 and variable temperature are by-products of many industrial processes. Blast furnace gas and converter gas from ferrous metallurgy, gas from the shaft furnace and gas from the electric furnace from non-ferrous metallurgy are examples of these gases. Technological gases with a low-heating value about 4÷18 MJ/Nm 3 are low calorific fuels. Such kind of fuels can be utilized in gas turbine or internal combustion engine. Gases within lower heating value range of 1.2 ÷ 4 MJ/Nm3 can not be used as single fuel. Such kind of gases should be burnt out. The paper presents typical methods for energy recovery from technological low-calorific gases.


High temperature and heavily dusted process gases with low calorific value are by-products in copper metallurgy. They must be afterburnt, cooled and dedusted before directing them to atmosphere. Low concentration of combustible components in such gases causes problems while afterburning. Dedusting process parameters require precise control of the temperature of these gases before dust collection plants. One of the most important problem related to utilization of the process gases is to dispose waste heat generated during their cooling. Rationalization of the afterburning and cooling processes needs an accurate mathematical description of occurring phenomena. It requires the elaboration of a mathematical model describing the most significant processes occurring while the utilization of the gases. The paper presents a mathematical model of afterburning and cooling of the process gases generated during reduction of slag from a fluidized-bed furnace in an electric furnace at a copper plant. The CFD Ansys software was used to elaborate this model. The model describes the most significant phenomena occurring in the afterburning chamber and water coolers surrounding its lower part. It was applied to carry out numerical simulations for exemplary mass flow of the gases from the electric furnace in order to determine the area of afterburning carbon monoxide and heat flux transferred to water during the cooling process. Calculation results obtained on the basis of the model and formulated conclusions are presented.

Loading Politechniki Slaskiej w Gliwicach collaborators
Loading Politechniki Slaskiej w Gliwicach collaborators