Investigation into a new steam ejector with several entrainment channels for energy utilization improvement

As an important energy conversion device, steam ejector is a widely used energy-saving technology. To fully utilize the large pressure difference between the low-pressure region and the entrainment fluid entrance, a new ejector with added entrainment channels is developed, so that more entrainment fluid is sucked in the ejector from the added entrainment channels, and to promote the entrainment capacity of the ejector. Three geometrical models of the ejector were established, and the numerical analysis was calculated. Under the condition of different compression ratio and expansion ratio, the entrainment capacity of the ejector with different number of entrainment channels was analyzed and discussed. The results show that with the increase of entrainment channels, reduction of the compression ratio can effectively increase the entrainment ratio and reduce the critical compression ratio, but the optimal expansion ratio decreases, and the less primary fluids is consumed and more entrainment fluids are sucked. Thus, the purpose of reducing energy consumption and effectively heightening the entrainment capacity can be achieved. Compared to a traditional ejector, The entrainment capacity of the ejector with two or three or four entrainment channels increased by 69.98%, 170.7% and 272.29%, respectively. Therefore, by adding the entrainment channels, the entrainment capacity of the ejector is greatly promoted, the production efficiency and energy utilization are improved, and the energy consumption is reduced.