Middle and high pressure industrial steam supply system coordinated by intermediate regulating valve parameter regulating and steam compressor

Abstract

The invention provides a middle and high pressure industrial steam supply system coordinated by intermediate regulating valve parameter regulating and a steam compressor. The system mainly comprises a steam turbine, a generator, a steam turbine intermediate regulating valve, the steam compressor, a gear box high speed shaft, a gear box low speed shaft, a drive variable frequency motor, valves and pipe fittings, wherein the valves and the pipe fittings are connected to the devices. After the system is used, the steam compressor driven by the variable frequency motor can improve industrial steam turbine reheat steam which does not meet the industrial steam supply user parameter requirement to steam supply out of hot user requirement parameters, the reheat steam pressure changes with the load of a steam turbine set, and after the load is lowered to a certain extent, the intermediate regulating valve participates in regulation, so that the system can efficiently operate in the whole working condition of the steam turbine. The system utilizes the rotating speed of the variable frequency motor and inlet guide vanes of the steam compressor to regulate the system outlet steam pressure and flow parameters. The single stage isentropic efficiency of the steam compressor can be 80% or above, and the system has the characteristics of wide adaptability, high heat utilization efficiency and the like.

Description

technical field [0001] The invention relates to a medium-high-voltage industrial steam supply system for a thermal power generating set, in particular to a medium-high-voltage industrial steam supply system in which a central adjustment door is regulated and a steam compressor cooperates. Background technique [0002] With the gradual and in-depth development of energy conservation and emission reduction work, higher requirements are put forward for the energy conservation work of thermal power generation enterprises. Combined heat and power generation is to achieve cascade utilization of energy. This transformation method has become an effective way for domestic thermal power generation enterprises to save energy and reduce consumption. In the northern region, using steam turbine extraction or exhaust steam for centralized heating is an important aspect of thermal power generation enterprises. It is one of the transformation methods. In the southern region, the use of ste...

AI Technical Summary

Problems solved by technology

[0009] 1. The way of reducing the temperature and decompression of high-pressure parameter steam is to adjust the high-parameter steam to the user-demand parameter steam supply through the method of reducing temperature and decompression, sacrificing the working ability of steam, and the energy-saving effect is poor

[0010] 2. Use rotating baffles or heating butterfly valves to adjust the steam supply pressure. The rotating baffles need to modify the steam turbine body. The heating butterfly valve method has serious throttling losses, and these two methods have high requirements for steam supply parameters. Thermal user demand parameters can be modified at will, and this technology has a narrow scope of application

[0011] 3. Using a pressure matcher, the heating efficiency is greatly affected by the change of steam parameters, especially after the low pressure parameters decrease with the load reduction, the suction ratio is greatly reduced

Affected by unit load fluctuations, it is not suitable for unit operation under variable conditions

[0012] 4. The current mode of high-pressure industrial steam supply for thermal power generating units is basically unable to meet the steam flow parameter transformation of a single unit above 200t / h

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