An energy-saving kiln with waste heat utilization and balanced quenching air volume

Abstract

The invention relates to a kiln, in particular to an energy-saving kiln which utilizes waste heat and balances the volume of quenching air. The kiln includes a continuous kiln body of a quenching zone: multiple quenching air supply pipes connected to the quenching fan are installed on both sides of the quenching zone, and a balance wind hood communicating with the inside of the quenching zone is provided on the top of the quenching zone. The balanced wind hood is composed of connected horizontal air ducts and vertical air ducts to form a T-shaped air duct structure, in which the lower opening of the vertical air duct communicates with the inner space of the quenching zone through the wind hood made of light insulation materials, and the horizontal air duct One end is connected to the inlet of the combustion-supporting fan, and the other end is connected to the heat supply pipe of the drying kiln. The invention prevents the cold air from leaking into the burning zone to cause high energy consumption per unit of product, and also reduces the power of the fan for drawing air from the heat exchange zone, so as to achieve the purpose of saving energy and reducing consumption.

Description

technical field [0001] The invention relates to a kiln, in particular to an energy-saving kiln which utilizes waste heat and balances the volume of quenching air. Background technique [0002] In the existing horizontal (horizontal) continuous kiln structure, there is generally a quenching zone at the end of the firing zone. At this time, there is a liquid phase in the green body, which can be cooled quickly without cracking. Generally, the air is directly supplied, and the The body temperature in this area drops below 600°C and then slowly cools down. For the hot air after cooling, due to the high temperature, the existing kiln mainly installs a fan at the rear of the slow cooling to discharge it, but the response lags behind the distance and is affected by the fluctuation of the product loading, so it is difficult to effectively balance the air volume supplied. At this time, the following problems are brought about: when the air volume in the quenching zone is too large t...

AI Technical Summary

Problems solved by technology

For the hot air after cooling, due to the high temperature, the existing kiln mainly installs a fan at the rear of the slow cooling to discharge it, but the response lags behind the distance and is affected by the fluctuation of the product loading, so it is difficult to effectively balance the air volume supplied. At this time, the following problems are brought about: when the air volume in the quenching zone is too large to be balanced in time, part of the excess air volume flows into the firing zone and part of it flows into the slow cooling zone

When it flows into the firing zone, because the air temperature in the quench zone is lower than the maximum firing temperature, the firing temperature of some products exceeds 1200°C. At this time, the firing zone will stabilize the temperature in the high temperature zone by increasing the amount of fuel and increase the fuel consumption; When it flows into the slow cooling zone, the billet temperature will increase, and the slow cooling zone will reduce the temperature by increasing the indirect cooling air volume, resulting in increased power consumption

[0003] During the rapid cooling and exhausting, if the pressure in this area is reduced due to the excessive extraction, the high-temperature flue gas in the burning zone will be discharged and the fuel consumption will be high; at the same time, the cold air at the kiln tail will flow into the slow cooling area, causing the product to cool too quickly and crack

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