Research On Distributed Energy System Of Natural Gas Processing Plant

Distributed energy system is an advanced and efficient way of energy utilization, realizing the cascade utilization of energy, and being the modern ways of energy supply which comes to the realization of energy supply in the center of the load, advantaging with high efficiency, clean environmental protection, safety and economy benefit. In this article, the distributed energy system technology is applied in natural gas processing plant, to solve the problems as follows:①When the load is too low downtime, gas turbine is easy to cause surge occur. ②Low capacity, in order to make the gas turbine to work in the surge line above, often need to be processed gas circumfluence, causing energy waste. ③When summer air temperature is too high, the air cooler cooling, needing additional spray cooling.Through the relevant data collection and analysis of the natural gas processing plant, this topic determines its cold hot electric load. The electricity load of the factory part is about 2527 kW, cooling load of cooler is about 117.3kW in depropanizer, cooling load of cooler is about 133.6kW in debutanizer. the electricity load of office building is about 315 kW, heat load is about 621 kW, cooling load is about 855 kW.This topic is based on the cold and hot electricity load supply and demand of natural gas treatment plant, to ensure that the natural gas treatment plant safe and reliable power and energy efficiency for selecting principle, designing distributed energy system for natural gas processing plant, to develop a reasonable plan: the gas turbine of natural gas processing plant burns natural gas driven generator to produce electricity, At the same time high temperature flue gas comes into the waste heat boiler, to produce steam. Steam comes into the steam-water heat exchanger respectively and libr absorption chiller heat exchange. Steam- water heat exchanger provides heat load, libr absorption chiller provides cooling load. Decided to “electricity in accordance with the cold” operating mode, First of all to ensure the electric load demand of natural gas treatment plant, secondly by steam libr absorption chiller and steam- water heat exchanger respectively to ensure the quantity of cold and heat demand. On this basis for equipment type selection, to determine the parameters of the waste heat boiler, libr absorption chiller, the heat exchanger and the circulating pump. For main node energy flows, each node of distributed energy system solutions process can flow analyzed. Main equipment of process schemes can be made exergy flow analysis with steady flow specific exergy calculation formula. Exergy efficiency of distributed energy system can be calculated with exergy efficiency formula.Based on HYSYS software simulation to analysis gas turbine load rate and the complementary combustion rate affect the performance of distributed energy system: with the increase of load rate, gas turbine power generation efficiency increases gradually, cascade utilization energy of distributed energy system increases, the utilization rate of total energy of the system increased gradually; with the increase of complementary combustion rate, relative production of waste heat boiler steam and smoke exhaust temperature increases, the refrigeration power increase, but always utilization decreases. When the system is needed for cold hot electric load changes, By adjusting the power of distributed energy system and complementary combustion, to adjust natural gas treatment plant of cold and hot load required: when cold and hot load demand increase, firstly consider increasing the power, consider increasing the quantity of afterburning again; when cold and hot load demand reduction, firstly consider reducing the quantity of afterburning, consider reducing the power again.Finally, the economic efficiency analysis has been made to distributed energy system of natural gas processing plant: primary energy utilization rate is 72%, increasing 23% than the original; save gas fuel costs 3.81 million yuan every year; reduce 1254652.1kg of CO2 emissions, 32013.4kg of SO2 emissions every year. Thus it can be seen that the scheme is high efficiency and good environmental performance.This topic research results can offer a theoretical basis for saving energy and reducing consumption of the domestic natural gas processing plant.