Design of Boiler Steam Temperature Control System

Cuihui Shen, Yamin Zhao, Yiqun Li

Abstract


Nowadays, our life needs more and more electricity, and our lives cannot be without electricity, which requires our power to develop more quickly. Power plants are undoubtedly the place where electricity is produced. And now most of the power plant or chemical energy can be converted into heat, and then through the heat to do power production. The boiler is the main part of the power plant. Boiler unit consists of boiler body equipment and auxiliary equipment. The main body of the boiler consists of 'pot' (soft drinks system) and 'furnace' (combustion system). Baotou thermal power plant is mainly burning gas. The gas and air are at a certain rate into the furnace burning. This can greatly reduce the pollution of the environment, but also the full use of fuel. The soda system is mainly carried out in the drum. The heat generated by the combustion system heats the water in the drum, producing steam and then pushing the steam turbine into mechanical energy and finally into electrical energy. This has a high demand for water level, water composition, and the temperature of the steam produced in the drum. The water level should have upper and lower bounds, keeping it within a certain range. Water level is too high, will affect the steam drum soda separation effect, so that the steam drum exports of saturated steam with water increased, causing damage to the turbine, will cause serious explosion. And the water level is too low, it will affect the natural circulation of the normal, serious will make the individual water pipe to form a free water, resulting in flow stagnation, resulting in local metal wall overheating and burst pipe. Water in the heating at the same time will form a lot of scale, if not the chemical treatment of water will be in the formation of scale in the drum, cleaning more difficult, so the damage to the drum. The pressure of the drum is also an important control variable, and pressure control is highly correlated with liquid level control. It is necessary to ensure the integrity of the equipment, but also to ensure safety, followed by ensuring that the process of normal operation of the drum water. This time, the design is mainly for the unit steam temperature control system design. Steam temperature is one of the important indicators of boiler operation quality. It is too high and too low will significantly affect the power plant safety and economy. If the temperature of the steam is low, it will cause the power plant to increase the heat consumption and increase the axial thrust of the turbine to cause the thrust bearing to overload, but also cause the steam turbine to increase the final steam humidity, thus reducing the efficiency of the turbine, aggravating the erosion of the blade. On the contrary, the steam temperature is too high will make the super-heater wall metal strength decreased, and even burn the high temperature of the super-heater, the steam pipe and steam turbine high-pressure part will be damaged, seriously affecting safety. The boiler temperature control system mainly includes the adjustment of the superheated steam and the reheat steam temperature. The superheated steam temperature is the highest temperature in the boiler soda system. The stability of the steam temperature is very important for the safe and economical operation of the unit. Therefore, in the boiler operation, must ensure that the steam temperature in the vicinity of the specified value, and the temperature of the super-heater tube wall does not exceed the allowable working temperature.


Full Text:

PDF

References


Huang Xinyuan. Power plant boiler operation and combustion adjustment [M]. 2nd edition. Beijing China Electric Power Press, 2007.

Guodian Taiyuan first thermal power plant. Boiler and auxiliary equipment [M]. Beijing: China Electric Power Press, 2005

Liu He, Bai Yan, Li Xinli. Thermal power plant thermal automatic control technology and application [M]. 1st edition. Beijing: China Electric Power Press, 2009.

Xing Peisheng. Boiler equipment operation and accident treatment [M]. 1st edition. Beijing: Chemical Industry Press, 2006.

Sun Hongcheng, Weng Weicheng, Wei Jie. Process Control System and Engineering [M]. Third Edition. Beijing: Chemical Industry Press, 2010.

Wang Xiang. Power plant thermal equipment and systems [M]. 1st edition. Beijing: China Electric Power Press, 2006.

Wang Xueming. Cascade adjustment in the superheated steam temperature control application [J]. Nonferrous Metals, 2007, (4): 62-63.

Pan Xiaoying, Liu Xuyan, Li Yi. Preliminary Study on Scheme Design of

Boiler Feedwater and Superheated Steam Temperature Control System [J] .Jilin Forestry College, 1995, (3): 163-166.

Lin Wenfu, Hu Yan. Unit unit automatic control technology [M]. 2nd edition. Beijing: China Electric Power Press, 2008.

Fu Xinhe. Power plant boiler steam temperature control program [J] .Guangdong Electric Power, 2007, (5): 13-15.

Wang Peilun. Based on the immune system of boiler steam temperature control [D]. Xi'an University of Science and Technology, 2011.

Wang Guibin, Liu Hao. Boiler control system design [J]. Coal Mine Modernization, 2005, (5): 57-58.

Wenfeng. Introduction to modern power plants [M]. 2nd edition. Beijing: China Electric Power Press, 2008.

Zhu Quanli. Boiler equipment and systems [M]. Beijing: China Electric Power Press .2006.

Zhu Ling-feng. Improvement of superheated steam temperature control strategy for power plant boiler [D]. Huazhong University of Science and Technology, 2005.




DOI: http://dx.doi.org/10.24294/tse.v1i1.357

Refbacks

  • There are currently no refbacks.




Creative Commons License

This site is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.