Abstract
Ocean Thermal Energy Conversion (OTEC) is one of the emerging industries of ocean energy and an important link in carbon neutrality. Turbine is a key component of ocean thermal energy conversion, which has an important impact on the performance and energy conversion efficiency of the system. This paper fully considers the application characteristics of ocean thermal energy conversion and the state conversion characteristics of ammonia working fluid. Taking the 100 kW radial inflow turbine in the OTEC application system as an example, based on the design, the turbine is optimized for the key parameters of the turbine stator and the influence of different geometric parameters is analyzed. Subsequently, the optimization results are verified by CFD numerical simulation analysis under different conditions. The results show that the number of stator blades has an important influence on the performance of the turbine. Further optimization studies have shown that through optimization, when the number of stator blades is 33, the internal flow field performance is the best, and the working conditions of the inlet and outlet working fluids are in accordance with the design points without obvious shock wave and reverse flow phenomenon, the efficiency is 89.46%, 3.94% higher than the design value.
Highlights
In a modern society with rapid economic and social development, understanding how to establish a balance between energy and the environment is an old topic
This has the following characteristics: Firstly, ammonia from thecycle evaporator first passes through the separator, which the ammonia vaporized from evaporator passes the through the separator, ensures the purity of thethegas passingfirst through turbine, and on which the other hand, the lean ensures the purity of the gas passing through the turbine, and on the other hand, the lean ammonia solution from the separator passes through the regenerator 1, and preliminary ammonia solution from the separator passes through the regenerator 1, and preliminary heating ofsolution the solution pump to improve energy utilization
According to the above optimization method, 11 sets of design values are selected within the range of the number of stator blades from 24–38, which are respectively mod‐
Summary
In a modern society with rapid economic and social development, understanding how to establish a balance between energy and the environment is an old topic. The development and utilization of marine renewable energy is a potential solution to this problem [1,2,3,4,5]. Ocean thermal energy conversion [10] is a new type of renewable energy and an important link in carbon neutrality. Ocean thermal energy conversion [11] (OTEC) refers to the use of surface warm seawater to heat certain low-boiling point working fluids and vaporize them to drive steam turbines to generate electricity; at the same time, deep-layer cold seawater is used to condense the exhausted steam after work into liquid, forming System circulation. The temperature of seawater below 800 m is constant at about 4 ◦ C, the resource distribution of ocean temperature difference energy mainly depends on the surface temperature of the seawater
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