Two-stage flash evaporator of waste heat power generation system of cement kiln

Abstract

The invention relates to a two-stage flash evaporator of a waste heat power generation system of a cement kiln The waste gas utilization efficiency of the cement kiln can be particularly improved during waste heat power generation by the aid of the two-stage flash evaporator. The two-stage flash evaporator is characterized in that two flash evaporators are serially connected with each other, a coal economizer is connected with a water inlet of the primary flash evaporator by a pipeline, a water outlet of the primary flash evaporator is connected with a water inlet of the secondary flash economizer, a water outlet of the secondary flash evaporator is connected to a boiler feed water pump, and a steam outlet of the primary flash evaporator and a steam outlet of the secondary flash evaporator are respectively communicated with a rear stage of a steam turbine to do work. The two-stage flash evaporator has the advantages that a system is simple and is low in cost, convenient to operate and adaptive to the characteristic of sharp fluctuation of waste gas parameters of the cement kiln, maximum generated power can be acquired from low-grade heat sources, the exhaust temperature of a boiler can be about 90 DEG C under the control, the heat utilization rate of low-temperature flue gas can be increased, and accordingly the purpose of utilizing energy to the greatest extent can be achieved.

Description

technical field [0001] The invention relates to a two-stage flash evaporator in a cement kiln waste heat power generation system, in particular to a two-stage flash evaporator capable of improving the utilization efficiency of waste gas in the cement kiln waste heat power generation system. Background technique [0002] As we all know, saving energy is an established long-term policy of our country, among which the utilization of waste heat is the most active and effective means. In many fields of existing industries in our country, the utilization of waste heat in the production process has attracted attention. In recent years, a large number of new process equipment and production lines have been invested in the transformation of the cement industry, and it is equipped with a pure medium and low temperature cement waste heat power generation system. In practical applications, due to the characteristics of the process, most of the parameters of the process waste heat flue g...

AI Technical Summary

Problems solved by technology

Moreover, the fluctuation range often exceeds the self-adjusting range of conventional waste heat power generation system design, making the waste heat power generation system unable to operate stably

Some fluctuations are even so large that the usual waste heat power generation system is forced to disconnect and shut down, and the economic benefits of waste heat recovery cannot be guaranteed

At present, although some cement plants have introduced waste heat power generation systems with flash evaporators, which have the ability to actively adjust and resolve the influence of process flue gas instability, there are obvious defects because most of these cement plants use single-stage flash evaporators. The steam waste heat power generation system cannot adapt to the large-scale flue gas fluctuations of the cement kiln, and cannot guarantee the stable operation of waste heat power generation. Moreover, the temperature of the hot water discharged from the outlet of the flash evaporator is still high, and the heat source has not been fully utilized.

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