An adaptive once-through boiler drainage expansion control device and drainage system

Abstract

The invention relates to a self-adaptive concurrent boiler drainage expansion control device and a self-adaptive concurrent boiler drainage system. Concurrent boilers are generally adopted by coal-fired power generation units with the power being 600MW or above, unit parameters frequently change along with the load, and adjustment of a drainage expansion system is difficult. The self-adaptive concurrent boiler drainage expansion control device is characterized by comprising a valve body base, a valve rod base, a sliding block base and a positioning base. A circular hole type steam flowing channel penetrates through the valve body base in the horizontal direction, and the two ends of the circular hole type steam flowing channel are connected with an expansion steam inlet pipe and an expansion steam outlet pipe respectively. A valve element movement space is defined by the valve rod base and the upper end surface of the valve body base. The two ends of a sealing valve rod are connected with a sealing valve element and a main sliding block respectively. The main sliding block and an auxiliary sliding block are arranged in the sliding block base, and the diameter of the main sliding block and the diameter of the auxiliary sliding block are matched with the inside diameter of the sliding block base. The upper end of a base sealing cover is connected with the positioning base. According to the self-adaptive concurrent boiler drainage expansion control device and the self-adaptive concurrent boiler drainage system, the energy of steam and drainage in the expansion process is sufficiently recycled, and parameters of the drainage expansion system can be adjusted according to the load requirements at any time.

Description

technical field [0001] The invention relates to an adaptive type once-through boiler drain expansion control device and a drain system, which belong to the field of electric power production. Background technique [0002] Coal-fired generating units are developing towards high parameters and large capacity, and once-through boilers are generally used for units above 600MW. At present, the high-pressure drainage of the main body generated during the startup and operation of the once-through boiler is generally sent to the atmospheric drainage expansion vessel, and the steam generated by the expansion is discharged into the ambient air, and the expanded water is sent into the condenser by the drainage pump. There are three main disadvantages of this drainage system: (1) The saturated steam at about 100°C is directly discharged into the environment, which increases the water consumption and heat energy consumption of the power plant; (2) The drainage is directly sent to the con...

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Problems solved by technology

There are three main disadvantages of this drainage system: (1) The saturated steam at about 100°C is directly discharged into the environment, which increases the water consumption and heat energy consumption of the power plant; (2) The drainage is directly sent to the condenser, and the temperature of the drainage and the heat The mismatch of well water temperature not only affects the safety of the vacuum operation of the condenser, but also increases the heat dissipation loss of the thermodynamic cycle, which affects the economy of the power plant; (3) The expansion vessel is connected to the atmosphere, which easily deteriorates the water quality of the condensate system

However, due to the demand for peak regulation, power plant boilers often need to change load or start and stop operations. During this process, the thermal parameters such as pressure and temperature of the unit are also changing at any time. Difficulty in adjusting

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