[Q&A Question 282] 10.10.2017
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【Q&A Question 282】October 10, 2017: What are the benefits of using superheated steam in turbines? (Unless otherwise specified, all Q&A questions are based on hydrogenation units.) ) The answers to the daily questions change, and today’s answers are shown in subsequent questions. For management purposes, if you need to view content from a few days ago, please go through the summary post below. 2017 Q&A Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html (Source: Haichuan Chemical Industry Forum)
Avoiding a drop in saturated steam temperature helps prevent water droplets from eroding the impeller.
Since the pressure loss of reheat steam has a greater impact on the thermal efficiency of the unit compared to that of fresh steam, using a single-tube system enables more effective reduction of pressure loss, thereby ensuring the steam’s capacity to do work
1. Steam has a large heat storage capacity, and it can release a large amount of heat as it transitions from high temperature and high pressure to low temperature and low pressure. 2. Water can evaporate into steam at temperatures above its boiling point, and it can condense back into water at temperatures below the saturation temperature corresponding to its saturated pressure. By utilizing this change in volume as well as the change in heat, the thermal energy of the steam can be converted into mechanical energy. 3. Safety is the primary reason; maintaining a certain degree of superheat can effectively prevent water hammer in the turbine as well as cavitation in the last-stage blades. Furthermore, in terms of economy, within the limits permitted by the materials, the higher the initial parameters, the lower the coal consumption per unit of electricity generated
The working principle of a turbine is an energy conversion device that converts thermal energy into kinetic energy, and then kinetic energy into mechanical energy. Therefore, turbines require superheated steam in order to perform at their best
Superheated steam has a high heat content and high efficiency; it is less likely to condense, which reduces the risk of water hammer. It also decreases corrosion and scaling in steam turbines
A clear advantage of using superheated steam is that no condensation water is generated when the steam drives the equipment, which effectively prevents the risk of equipment damage caused by carbonation and corrosion. Furthermore, the theoretical thermal efficiency of a turbine is related to the enthalpy values at its inlet and outlet. Therefore, increasing the pressure of the superheated steam is equivalent to increasing the enthalpy at the inlet of the turbine, thereby effectively improving thermal efficiency.
1. High temperature, ample heat, and significant work output. 2. No water content to prevent damage to the impeller. 3. Avoid pipeline water hammer. 4. After coming out, it becomes saturated steam and can be used further.
No condensation water is generated when operating the device, effectively preventing the risk of equipment damage caused by carbonic acid erosion and corrosion.