Expander-generator set for utilization of natural gas overpressure energy

A A Mukolyants,D K Ergasheva,I V Sotnikova,A A Taubaldiev,F.-J Lin,K Suslov,A Kler,Y Sun,C.-I Chen,N Voropai,P Lombardi,A.M Foley,D Sidorov

doi:10.1051/e3sconf/202128907034

Abstract

The article deals with the problem of using secondary energy resources in the system of transportation and distribution of natural gas, and the possibility of generating electricity without burning fuel by reducing high-pressure natural gas at gas distribution stations. The analysis of the influence of the gas temperature at the entrance to the expander - generator unit, as well as the dependence of the power of the expander - generator unit on the gas temperature and the temperature of the low-potential source is presented. Optimal temperatures are obtained at which the power of the expander-generator unit is maximal for the given gas parameters.

Highlights

In the context of rising prices and increasing demand for energy resources, the problem of energy conservation and the use of non-traditional energy sources is of particular importance
Reducing the specific energy intensity of the economy is the main task of Uzbekistan's energy policy, without which the energy sector will inevitably constrain the country's socioeconomic development
On the territory of Uzbekistan there is a large number of gas distribution stations (GDS), where the potential energy of pressure is lost during reduction

Summary

Introduction

In the context of rising prices and increasing demand for energy resources, the problem of energy conservation and the use of non-traditional energy sources is of particular importance. The forecast estimate shows that in the period up to 2030, the annual growth of electricity consumption in the Republic of Uzbekistan will be about 6-7 %, and the main goal of the Concept of Providing Electric Energy for 2020-2030 is to meet the growing demand for electric energy at competitive prices and the dynamic development of the electric power industry In this regard, the issue of distributed power generation from secondary energy resources for further growth of energy saving becomes relevant. Without preheating before the expander, the gas temperature may be lower than the temperature at which the operation of gas pipelines is impossible For this reason, in addition to the expander and the electric generator connected to it, the EGU includes a heat exchanger for heating gas in front of the expander [47]. To increase the temperature, the thermal energy obtained by a heat pump unit operating on a low-potential working body is used. Enthalpy difference in the adiabatic gas expansion process, HAD, kJ / kg, in the expander generator is calculated by the formula: k−1

Pinput k

Gas consumption Inlet pressure Output pressure