Afterheat double-voltage recovery and generation system of dry cement production line

Abstract

The invention discloses an afterheat double-voltage recovery and generation system of a dry cement production line, having the characteristic of improving the afterheat generation efficiency. The afterheat double-voltage recovery and generation system of a dry cement production line is provided with a high-temperature kiln head afterheat boiler, and a kiln head grate cooler is provided with a high-temperature gas taking port and a medium-temperature gas taking port. Through the device, high-temperature waste gas is led to the high-temperature kiln head afterheat boiler by combining the temperature distribution characteristics in the kiln head grate cooler; medium-temperature smoke is led to a medium-temperature kiln head afterheat boiler, and steam coming out of the medium-temperature kiln head afterheat boiler and a kiln tail afterheat boiler is subjected to secondary heat exchange through the high-temperature kiln head afterheat boiler; the temperature of the steam after secondary heat exchange is improved to about 350-410 DEG C, and then the steam is sent into a steam turbine generator. The invention improves the steam enthalpy value, the effective enthalpy drop and the steam quality, reduces the flow and the steam exhaust loss of afterheat in a turbine condenser, promotes the improvement of the afterheat generation efficiency and is suitable for being popularized and applied in systems utilizing afterheat generation.

Description

technical field [0001] The invention relates to a power generation system, and specifically discloses a waste heat double-pressure recovery power generation system for a dry process cement production line. Background technique [0002] At present, the waste heat recovery power generation system for dry process cement production is like this. An air intake port is set at the grate cooler at the kiln head, and the flue gas with waste heat from the air intake port enters the AQC boiler (medium temperature kiln head waste heat boiler) to recover waste heat. The flue gas with waste heat from the kiln tail enters the kiln tail SP boiler (kiln tail waste heat boiler) to recover the waste heat, and the two superheated steams merge into the steam turbine to generate electricity. The outlet of the steam turbine is connected to the condenser, and the water produced by the condenser passes through After the condensate pump and oxygen removal device are pumped into the AQC boiler and the...

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Problems solved by technology

[0003] The existing waste heat recovery power generation system has the following disadvantages: the AQC boiler and the kiln tail SP boiler are overheated at one time, the steam temperature is about 330°C, which is relatively low, and the steam pressure is about 2.0-2.5MPa, which is relatively high, and the power generation efficiency is low, which is not conducive to waste heat. Improvement of recovery and power generation efficiency; part of the waste heat entering the AQC boiler can only be fed into the steam turbine for power generation through low-pressure steam at 170°C and 0.2 MPa. It is conducive to the improvement of waste heat recovery efficiency, and at the same time, the increase of steam pressure increases the investment of waste heat system

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