A large-scale negative pressure heating furnace air preheating system and method

Abstract

The invention relates to an air preheating device and method of a large negative-pressure heating furnace. The air preheating device comprises a flash tank, a centrifugal pump, a temperature reduction system, preheating device bodies and a water returning system, wherein the flash tank is sequentially connected to the centrifugal pump, the temperature reduction system, flow controllers, the preheating device bodies and the water returning system through a pipeline; saturate condensate liquid is contained inside the flash tank and is conveyed out for being further utilized after sequentially flowing through the centrifugal pump, the temperature reduction system, the preheating device bodies and the water returning system; and the multiple preheating device bodies can be arranged and are connected between the temperature reduction system and the water returning system in parallel through a pipeline. According to the technical scheme, the flow distribution problem of the preheating device bodies is effectively solved, the system operation stability is guaranteed through a temperature reducer, the energy conservation efficiency is improved by reinforcing the heat exchange measures, and the production cost is lowered.

Description

technical field [0001] The invention relates to an energy-saving system for air preheating by using the waste heat of the heating medium, which aims to increase the temperature of the combustion-supporting air entering the furnace, reduce fuel consumption, and save production costs, and especially relates to an air preheating system and method for a large-scale negative pressure heating furnace . Background technique [0002] In various sectors of industrial production, a large amount of waste heat such as condensate, low-pressure steam, and flue gas has not been effectively utilized, resulting in a serious waste of energy. Therefore, the development of effective waste heat recovery devices is an effective way to rationally utilize energy. . [0003] Due to the low grade and universality of waste heat, the waste heat recovery system is required to have the following points: 1. It can transfer large heat flow under small heat transfer temperature and pressure, and the heat r...

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Problems solved by technology

[0008] 6. During the long-distance transportation of condensate, water hammer occurs due to pressure drop, and safe production requires energy-saving systems to run smoothly

[0009] At present, there is no heating furnace air preheating system that meets the above requirements. Therefore, it is urgent and necessary to invent a large-scale negative pressure heating furnace air preheating device that meets the above technical requirements.

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