THE IMPROVEMENT OF THE ECONOMIC AND ENVIRONMENTAL CHARACTERISTICS OF COGENERATION PLANTS BASED ON HEAT ENGINES WITH THE THERMOCHEMICAL METHOD OF CLEANING THEIR EXHAUST GASES
Abstract
The article presents the results of research aimed at improving the economic and environmental characteristics of cogeneration plants based on heat engines (ICE, GPE, GTU), with a thermochemical device for the neutralization of harmful components of its waste gases, and a boiler-utilizer (BU). The neutralization process takes place in a layer of red-hot carbon material and a gaseous medium, which includes: methane, hydrogen and carbon monoxide.
The effectiveness of the proposed process was investigated both analytically, using specialized computer programs for energy management, and experimentally, by a special laboratory device, which made it possible to simulate in a wide range of temperatures (500...1000°C) how the products of natural gas combustion (the base fuel for the GPA and GTU), with a defined coefficient of excess air (oxygen), as well as the concentration of CO and NOx in their composition.
The primary task of the experimental study was to determine the effect of temperature on the neutralization of nitrogen oxides and carbon monoxide in natural gas combustion products. The results of the studies (in the considered temperature range of 750...950℃) showed the possibility of reducing the concentration of nitrogen oxides by 2.5...3 times, and the concentration of carbon monoxide by almost 5 times. At the same time, it was established that the efficiency of NOx neutralization at the considered temperature range does not change significantly (within 10%), which makes it possible to carry out the neutralization process at a temperature of 750...780℃ and reduce the energy cost.
The final neutralization of the exhaust gases of the engine and the utilization of their thermal potential is carried out in the boiler-utilizer. The placement of the thermochemical device in front of the boiler-utilizer, on the one hand, changes the thermal characteristics of the cogeneration plant to direction of increasing its heat loads, and on the other hand, increases the maneuverability of the plant, providing possibility of independent change of electrical and thermal load. In addition, the use of solid fuel with its gasification in the device allows not only to neutralize the harmful components of the engine's exhaust gases, but also to provide a partial replacement of natural gas in the engine and the boiler - utilizer with a corresponding reduction of thermal and harmful emissions in to the environment.
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