Improved lime kiln exhaust gas waste heat power generation system and power generation method thereof

Abstract

The invention discloses an improved lime kiln exhaust gas waste heat power generation system and a power generation system of the improved lime kiln exhaust gas waste heat power generation system. The power generation system comprises a chimney, exhaust gas valves, a waste heat boiler, a draught fan, a steam pocket, a steam turbine, a power generator, a condenser, a cooling tower, a condensate pump, an oxygen remover, a boiler water feeding pump, an oxygen removing water returning pipe and a redundant steam inlet pipe. A superheater, an evaporator and an economizer are sequentially arranged inside the waste heat boiler from top to bottom. The oxygen removing water returning pipe is connected with a water outlet of the boiler water feeding pump. The redundant steam inlet pipe is connected with a steam inlet of the superheater. According to the power generation method, redundant saturated steam in a steam pipe net is supplemented into the superheater inside the waste heat boiler through the redundant steam feeding pipe, the flow of superheated steam entering the steam turbine is increased, and the generated power amount is increased. According to the power generation method, a dual-pressure system can be further used, the heat transmission temperature difference is reduced, the entropy production is reduced, and the generated power amount is increased.

Description

Technical field [0001] The invention relates to a lime kiln waste heat power generation system and a power generation method thereof, in particular to an improved lime kiln waste heat power generation system and a power generation method thereof, belonging to the technical field of waste heat power generation. Background technique [0002] The existing lime kiln waste heat power generation system has a structure like figure 1 As shown, it includes the chimney 1, the flue gas valve 2, the waste heat boiler 6, the induced draft fan 7, the steam drum 8, the steam turbine 9, the generator 10, the condenser 11, and the cooling tower 12. The waste heat boiler 6 is sequentially arranged from top to bottom. There are superheater 3, evaporator 4 and economizer 5. [0003] The power generation principle of the above-mentioned lime kiln waste heat power generation system is: the inlet waste heat of the waste heat boiler 6 comes from the lime kiln preheater, the intake temperature is about 350...

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Problems solved by technology

[0004] However, the above-mentioned lime kiln exhaust gas waste heat power generation system has the following defects: 1) The lime kiln production line attached to the general iron and steel plant has surplus saturated steam in the steam pipe network, and the steam pressure is about 1.0MPa, and the system does not utilize this surplus saturated steam , resulting in insufficient power generation; 2) Since the steam system is a single-pressure system, the heat transfer temperature difference is large, the system entropy increases, and the energy is not better utilized

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