Energy-saving kiln

Abstract

The invention relates to an energy-saving kiln. The energy-saving kiln comprises a first heat recovery device, a second heat recovery device, a cooling device, a plurality of combustion devices and akiln body, wherein a transfer passage is formed in the kiln body, the kiln body can be sequentially divided into a baking segment, a heating segment I, a heating segment II, a quenching segment and acooling segment along the movement direction of a product; the first heat recovery device is provided with first recovery air inlet connected to the top of the cooling segment and is connected with the drying segment, the heating segment I and the heating segment II; the second heat recovery device comprises a second recovery air inlet connected to the top of the quenching segment and is connectedwith the combustion devices and the heating segment I; the cooling device comprises a cold wind inlet and is connected with the quenching segment, the heating segment II and the heating segment I; and each combustion device comprises a first nozzle located at the bottom of the heating segment II and a second nozzle located at the side part of the heating segment II, can reduce energy loss and besides, can reduce the upper and lower temperature differences of the transfer passage.

Description

technical field [0001] The invention relates to the technical field of industrial furnaces, in particular to an energy-saving furnace. Background technique [0002] The burners of the tunnel kiln in the prior art are basically installed on the walls on both sides of the tunnel kiln, and are arranged in two layers, and most of the combustion chambers are arranged on the kiln roof and the kiln car surface, that is, on the kiln roof and the kiln car surface. A combustion channel of about 200mm is set between the car surface and the fired product. This design solves the problems of some fired products, but at the same time it brings the following problems: [0003] 1. Energy consumption problem: Because the main energy waste of the tunnel kiln is the heat absorption of the kiln car and the heat dissipation of the kiln roof, the combustion channel is set on the kiln roof and the kiln car surface, so that the flame ejected from the burner first contacts the kiln roof and the kiln ...

AI Technical Summary

Problems solved by technology

[0003] 1. Energy consumption problem: Because the main energy waste of the tunnel kiln is the heat absorption of the kiln car and the heat dissipation of the kiln roof, the combustion channel is set on the kiln roof and the kiln car surface, so that the flame ejected from the burner first contacts the kiln roof and the kiln car surface, and then passes through The heat is transferred to the fired product, resulting in the highest temperature of the kiln roof and kiln car surface, which increases the heat loss of the kiln roof and kiln car, resulting in energy waste

[0004] 2. Problems of upper and lower temperature and atmosphere stratification in the kiln: Because the prior art tunnel kiln burners are arranged on both sides of the wall in layers, the combustion flame is ejected horizontally, and the high-temperature flue gas floats up, causing the upper temperature to be higher than The lower part and the upper and lower atmosphere are uneven, which can only be solved by increasing the power of the lower burner, especially in the preheating section where the temperature difference between the upper and lower parts is larger. The solution is to reduce the temperature of the upper part by cold air, which not only increases energy consumption, but also greatly increases the smoke exhaust load

[0005] 3. The cooling temperature of the product is uneven: the cooling air of the tunnel kiln products in the prior art can only enter the kiln from the top, bottom, left, and right sides, especially for glaze firing and large-scale ceramic products, which require that the cooling air cannot be directly sprayed on the product, resulting in rapid cooling around the product. , while the intermediate product cools slowly, and the product cooling temperature is uneven, which not only increases the cooling time, but also affects the product quality

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