Energy-saving method for boiler waste heat recovery

Abstract

The invention discloses an energy-saving method for boiler waste heat recovery. The method mainly comprises the steps that flues are separated; waste heat recovery devices are arranged, communication among the waste heat recovery devices is controlled; waste heat is utilized; and standby flues are distributed. Flow dividing is conducted on a boiler flue, the boiler flue is divided into a plurality of common-used main flues and the multiple standby flues for standby application, so that the smoke and heat discharged from the boiler are divided into the multiple common-used main flues. The multiple graded waste heat recovery devices are arranged in the main flues and the standby flues to recover the heat and sequentially transfer the heat energy to grade higher waste heat recovery devices through a water medium, and the standby flues can participate in the work of waste heat recovery under the condition that the main flues cannot fully allocate the waste heat. Usage is more convenient, the applicability is stronger, the effect of waste heat recovery is better, and the economic benefit is significantly improved.

Description

technical field [0001] The invention relates to the technical field of recovery of boiler waste heat, and more specifically, relates to a method for recovering energy from boiler waste heat. Background technique [0002] Due to various reasons, the exhaust gas temperature of traditional boilers is high, and the waste heat of the chimney (gas) cannot be effectively utilized, which wastes a lot of fuel and effective heat. If the exhaust heat of the boiler can be recovered and utilized to the maximum extent, it can improve Boiler efficiency, economic and social benefits. In the past, the method of recovering and utilizing waste heat from boiler exhaust was simply to install a waste heat recovery device in the chimney (channel). Although a part of the heat was recovered, due to the unreasonable structural design, the chimney (channel) was not divided, and the waste heat recovery The device cannot effectively recover heat in stages, and still causes a large part of waste heat to...

AI Technical Summary

Problems solved by technology

[0002] Due to various reasons, the exhaust gas temperature of traditional boilers is high, and the waste heat of the chimney (gas) cannot be effectively utilized, which wastes a lot of fuel and effective heat. If the exhaust heat of the boiler can be recovered and utilized to the maximum extent, it can improve Boiler Efficiency, Economic and Social Benefits

In the past, the method of recovering and utilizing waste heat from boiler exhaust was simply to install a waste heat recovery device in the chimney (channel). Although a part of the heat was recovered, due to the unreasonable structural design, the chimney (channel) was not divided, and the waste heat recovery The device cannot effectively recover heat in stages, and still causes a large part of waste heat to be wasted. For this, we propose a method for boiler waste heat recovery and energy saving