Process Development and Simulation Analysis of Power Generation and Refrigeration Technology Using Natural Gas Pressure Energy with Electronic Gas Alarm Processor
Abstract
With the development of China's natural gas industry and the improvement in the construction of medium,high pressure natural gas pipeline network,large scale utilization of pressure energy of natural gas with electronic gas alarm processors from pipeline network is possible.
This paper developed a new process using pressure energy to produce cold water ,analyzed the energy and electricity saving benefit of this process,and pointed out the optimization direction of this process.The results of the study show that: with this process,income of the natural gas station of 1950000 Nm3/d is 24000 yuan,amounts to support cold water for 161000m2 for 8 hours everyday and the energy efficiency of the total process is 62.49%.This process will have a broad application prospects with the further development of China's natural gas industry.
1 Introduction
It's needed to throttle and regulate pressure with electronic gas alarm processors before natural gas sent to the terminal users via pipeline, and enormous pressure energy is recoverable in this process. For example, ecyclable pressure energy of 25°C,4 MP natural gas expanded to 0.4 MPa is about 322 kJ/kg in theory, while it's rarely recycled in the actual process.
At present, the researchers proposed several recycling way, the main two ways to use pressure energy of natural gas are power generation and refrigeration .The domestic industry widely used the latter to produce cold energy for city gas peak-shaving.
In order to improve the pressure energy utilization efficiency, This paper develops a power generation and refrigeration technology using natural gas pressure energy which uses the electric energy Outputed by natural gas turbine to drive ammonia refrigerating compressor, then let the low temperature natural gas after expansion exchanges heat with water to produce air conditioning cold water, thus can greatly reduce electricity consumption.
2 Simulation of Power Generation and Refrigeration Technology Using Natural Gas Pressure Energy with Electronic Gas Alarm Processor
2.1 Streams and Parameters Setting
This paper is based on 1950000 Nm^3/d (62326.875kg/h) of natural gas as the calculation benchmark,,the compositions of natural gas are shown in table 1. Natural gas of 15°C, 9MPa is from high pressure gas network,and its temperature turns to 5°C after utilization.
In this article, the ASPEN software is used to calculate, Peng-Robison equation of state is chosen as thermodynamics method,the isentropic efficiency of gas turbine is 80% and its mechanical efficiency is 90%,the mechanical efficiency of pump is 90%,maximum pressure drop of heat exchanger is 0.3atm.ammonia is choosen in the Cold media circulation system.
2.2 Process Simulation
The process of power generation and refrigeration Technology using natural gas pressure energy proposed in this paper can be seen in figure 1. As can be seen in figure 1, natural gas of 15°C, 9.0MPa, 62326.875kg/h is divided into three shares by splitter, NH3 is divided into five shares.
A stream of the natural gas expands to 2.5 MPa ,its temperature is lowered to - 49.1°C, then heated to 5°C by NH3 and transported to the gas users, NH3 is cooled to - 15 °C.
References:
1. Chen, S.K., Li, Z.L., Gao, Z.: Oil & Gas Storage and Transportion 28(2), 51 (2009)
2. Shen, D.M., Fernandes, F., Simões-Moreira, J.R.: Hydrocarbon Processing 85(1), 47–50 (2006)
3. Lawrence Kimble, E.: U.S.Patent: 6209350B1 (2001)
References:
1. Chen, S.K., Li, Z.L., Gao, Z.: Oil & Gas Storage and Transportion 28(2), 51 (2009)
2. Shen, D.M., Fernandes, F., Simões-Moreira, J.R.: Hydrocarbon Processing 85(1), 47–50 (2006)
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