Energy-saving type hot blast stove

Abstract

The invention discloses an energy-saving type hot blast stove comprising a stove body, a burning chamber, a burner communicated with one end of the burning chamber, a front smoke chamber communicated with the other end of the burning chamber and a rear smoke chamber communicated with the front smoke chamber through multiple heat exchange pipes. The stove body is provided with an intake port, an exhaust port and a smoke vent. The intake port is opposite to the heat exchange pipes. The smoke vent is formed in the tail portion of the rear smoke chamber. The hot blast stove further comprises a deflector, heat exchange fins and a combustion air preheating device, wherein the deflector is spirally wound around the outer circumference of the burning chamber in the length direction of the burning chamber, the heat exchange fins are arranged on the peripheries of all the heat exchange pipes, and the combustion air preheating device is communicated with the smoke vent, absorbs waste heat of discharged smoke and preheats gas fed into the burner. According to the energy-saving type hot blast stove, because gas to be heated and smoke flow are arranged in a pure countercurrent mode, the heat exchange temperature difference is increased, and the heat exchange area is reduced; due to the deflector, a flushing dead corner is avoided, and the service life is prolonged; due to the combustion air preheating device, the hot blast stove saves energy and is environmentally friendly.

Description

technical field [0001] The invention relates to an energy-saving hot blast stove, in particular to a fuel oil (gas) hot blast stove used for heating air in an airflow drying device. Background technique [0002] Hot blast stoves are widely used in air heating of airflow drying devices. However, hot blast stoves are different from general heat exchangers. General heat exchangers only involve heat exchange between hot and cold fluids, and do not involve fuel combustion and corresponding The conversion from the chemical energy of the fuel to heat energy, and the hot stove must include two processes: the combustion of the fuel and the heat exchange between the combustion product and the air. In the process of realizing the two processes of the hot blast stove, there are generally problems in the following aspects: [0003] 1) Heat exchange between high-temperature flue gas generated by combustion and air. The heat transfer coefficient of the cold side medium (air) is relativel...

AI Technical Summary

Problems solved by technology

The heat transfer coefficient of the cold side medium (air) is relatively low, the cooling condition of the heating surface is not good, and the material requirements are high; at the same time, high-temperature corrosion and high-temperature oxidation occur, causing the heating surface to burn through

[0004]2) The heat transfer coefficient of the medium on both sides of the hot blast stove is low, resulting in an increase in the heat transfer area and a decrease in compactness, resulting in higher costs

[0005]3) Most of the similar domestic products adopt bow-shaped deflector structure, and the cooling medium is easy to form a dead zone, resulting in local over-temperature damage

[0006]4) Insufficient consideration of thermal expansion, resulting in weld cracking during the expansion of the heating surface

[0007]5), the flue gas discharge temperature is high (above 300°C), and the heat loss of exhaust gas is high, which does not meet the requirements of energy conservation and environmental protection

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