CSP heating furnace flue gas recirculation waste heat recovery system

Abstract

The invention discloses a CSP heating furnace flue gas recirculation waste heat recovery system which comprises an air preheater and a coal gas preheater, the air preheater and the coal gas preheater are in through connection through a smoke exhaust main pipeline, the coal gas preheater is connected with a chimney through a smoke exhaust pipeline, a first adjusting valve is arranged on the smoke exhaust pipeline of the coal gas preheater and the chimney, and a second adjusting valve is arranged on the smoke exhaust pipeline of the coal gas preheater. The second adjusting valve and the third adjusting valve are both arranged on a bypass flue, the bypass flue is provided with a waste heat recovery system and an induced draft fan, the cold air pipeline is provided with a fourth adjusting valve, the other end of the cold air pipeline is connected with a cold air mixing fan through a three-way structure, and the other end of the three-way structure is communicated with a smoke exhaust main pipeline. And a regulating valve V is arranged between the cold air mixing fan and the adjacent three-way structure. The cooled flue gas is circulated to the front of the double preheaters to replace the existing mixed cold air to cool the discharged high-temperature flue gas, so that the oxygen control of the flue gas is realized, and the flue gas emission reaches the environmental protection standard; and a waste heat recovery device is additionally arranged for factory production and living, so that energy is saved.

Description

technical field [0001] The invention relates to the technical field related to CSP heating furnaces, in particular to a waste heat recovery system for flue gas recirculation of CSP heating furnaces. Background technique [0002] Because there is no preheating of the sheet metal in the CSP heating furnace, the temperature of the flue gas discharged from the furnace is basically the same as the furnace temperature, generally around 1150°C. In order to effectively reduce the overall energy efficiency of the heating furnace, generally a smoke exhaust system is installed Double preheater, namely air preheater and gas preheater. However, when the high-temperature flue gas as high as 1150 °C directly enters the double preheater, the temperature resistance of the preheater cannot be satisfied. Generally, a large amount of air is mixed in before entering the double preheater to cool down and then enters the double preheater. The consequences are: [0003] 1. The oxygen content in t...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a CSP heating furnace flue gas recirculation waste heat recovery system to solve the problems in the above-mentioned background technology that the conversion of oxygen exceeds the environmental protection standard, a large amount of waste heat resources are wasted and the heat pollution of the environment

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