Heat accumulation-exchange type heating stove and heating method thereof

Abstract

The invention provides a regenerative-recuperative combined heating furnace and the heating means, which relate to the technology field of industrial heating and recovery of waste heat. The invention is characterized in that: a regenerator and a heat exchanger are provided at the same time in the system; a soaking zone and a heating zone are arranged in front of the heating furnace; a preheating zone is provided on the tail of the heating furnace; multi-zone (point) heating system of the soaking zone, heating zone and preheating zone is adopted, the front of the heating furnace adopts regenerative combustion method and the back adopts recuperative combustion method; the preheating zone directly adopts flue gas waste heat to heat the materials. The objectives of the invention are to realize maximization of the heating furnace and smooth control of the furnace pressure, overcome the defects of the regenerative-recuperative heating furnaces and flue gas waste heat recovery technology and facilitate the low heat value fuels like pure blast furnace gas being applied in the heating furnace. The heating furnace has smooth pressure and long service life. The implementation of the invention realizes the maximization of the heating furnace, improves the flue gas waste heat utilization rate and reaches the aims of improving the pressure condition in the furnace, reducing air draft and sparking and energy conservation and emission reduction, etc.

Description

1. Technical field [0001] The invention relates to the technical field of industrial heating and waste heat recovery, which is mainly used in iron and steel, non-ferrous metallurgy, chemical industry, power, glass, ceramics, refractory and other industries, and any equipment involving heat storage-heat exchange combined heating and method. 2. Background technology [0002] According to the way of waste heat recovery, the existing heating furnace mainly includes heat exchange heating furnace (conventional heating furnace) and regenerative heating furnace. The remarkable feature of the heat exchange heating furnace is that a device for recovering the waste heat of the flue gas in the flue is used on the heating furnace - a heat exchanger (also known as a preheater, a heat exchanger). The heat exchanger is a thermal equipment that uses the exhaust gas (hot fluid) discharged from the furnace to preheat the combustion air and gas (cold fluid). Figure 3 is a schematic diagram of...

AI Technical Summary

Problems solved by technology

The main problems of the heat exchange heating furnace are: the heating furnace cannot use pure blast furnace gas with low calorific value as fuel; the waste heat of the flue gas cannot be fully recovered, and the thermal efficiency of the heating furnace is low, etc.

The main problems of the regenerative heating furnace are: high furnace pressure and large fluctuations, serious fire at the furnace mouth and furnace body, easy burning of the furnace door; difficult control of the furnace condition; short life of the heating furnace, etc.

On the basis of the existing regenerator, it is difficult to expand the volume of the regenerator by increasing the cross-sectional area of ​​the regenerator; if the expansion of the regenerator is realized by increasing the length of the regenerator, the flow resistance will be increased, and the Power consumption, which in turn affects the energy-saving effect of the regenerative heating furnace

Even if increasing the gravity of the smoke exhauster can increase the exhaust volume to a certain extent, with the increase of the gravity of the smoke exhauster, the flow rate of the smoke flowing through the regenerator will increase, which will affect the flow rate between the flue gas and the regenerator. The effect of heat storage and heat exchange will lead to the rise of the exhaust gas temperature of the heating furnace, which makes it difficult for the regenerative heating furnace to take advantage of the low exhaust gas temperature

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