Adjustment method of steam compressor in thermal power unit steam turbine waste steam stripping heat application system

Abstract

The invention provides a configuration and adjusting method of a steam compressor in an application system of upgrading and heat supplying of exhausted steam of a thermal power generating unit steam turbine. The system comprises a steam compressor driving small steam turbine, two levels of steam compressors, two levels of thermal-system heaters, a lubricating oil system, a gland seal system, valves and pipe fittings, wherein the valves and the pipe fittings are used for connecting the steam compressor driving small steam turbine, the two levels of steam compressors, the two levels of thermal-system heaters, the lubricating oil system and the gland seal system. By adoption of the system, low-pressure and low-temperature exhausted steam of the steam turbine is compressed through the steam compressor by using little driving steam, the pressure and the temperature of the steam are increased so that the steam can serve as a heat source to heat heat-supply network circulating water for heat supply, and therefore, the purpose that the exhausted steam of the steam turbine is used is achieved. According to the changing characteristics of the heat supply quantity and the water supply parameters, and the steam compressor efficiency operating characteristics, the adjusting method is used for adjusting the rotary speed of the small steam turbine and the opening of an inlet baffle of the steam compressor to achieve adjustment of the compressed steam flow quantity and the outlet pressure. By adoption of the technology, adaptability to the heat supply condition is wide, and heat utilizing efficiency is high. Heat supply efficiency is not influenced by the generating unit electrical load and heat load.

Description

Technical field: [0001] The invention relates to the application of a steam compressor in thermal power cogeneration, in particular to an adjustment method of a steam compressor in a thermal power unit steam turbine exhaust steam stripping heat application system. Background technique [0002] With the rise of domestic energy costs and the improvement of environmental protection requirements, high-efficiency energy recovery equipment has become a new trend in recent years. Cogeneration of heat and power has increasingly become an effective way for domestic thermal power enterprises to save energy and reduce consumption. In the northern region, using steam turbine extraction or exhaust steam for central Heat energy consumption and retrofit cost are the focus of research on current heating technology. [0003] There are three main methods for heating and heating transformation of pure condensing thermal power units: [0004] 1. The mid-row perforated steam extraction heating...

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Problems solved by technology

[0004] 1. The mid-row perforated steam extraction heating technology. This transformation method is to perform extraction and drilling on the medium and low pressure connecting pipe of the unit, and install the extraction pipe to the heating network heater. The advantage is that the transformation cost is low, and the disadvantage is that the supply High steam quality, high heating energy consumption, poor energy saving effect

[0005] 2. Absorption heat pump heating technology. Driven by part of the high-quality steam, this technology extracts waste heat from the exhaust steam of the steam turbine to heat the circulating water of the heating network through the working fluid. The maximum heating temperature does not exceed 90°C. The advantage is flexible operation and adjustment. The impact is small, the disadvantage is that the initial investment is large, the system life is short, and the operation and maintenance are more complicated

[0009] 1. The mid-row perforated steam extraction heating technology provides high-quality heating steam, high heating energy consumption, poor energy-saving effect, and the heating capacity fluctuates according to the change of the electrical load of the group

[0010] 2. Absorption heat pump heating technology requires large initial investment, short system life, complicated operation and maintenance, low COP, and gradually decreases with the running time. Generally, the working medium of absorption heat pump is lithium bromide, and the production of this working medium is effective. Security risks

[0011] 3. The high back pressure heating technology has poor adaptability. If it is applied to the wet-cooled unit, the steam turbine body needs to be modified, and the initial investment is large. It has high requirements on the unit's electrical load and heating load, and cannot adapt to the electrical load and thermal load. Fluctuates in a large range, not suitable for the transformation of units with small heating loads

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