Pre-coated sand regeneration system energy recovery method

Abstract

The invention discloses a pre-coated sand regeneration system energy recovery method, which comprises the following steps of: afterheat energy recovery of off gas after fuel is combusted in a roasting furnace, wherein hot off gas generated after fuel is combusted in a combustion chamber of the roasting furnace is subjected to heat exchange at the tail of the roasting furnace through a mounted heat exchange device to generate hot air, then the hot air is delivered to the combustion chamber of the roasting furnace and an air distribution port at the bottom of the roasting furnace respectively so as to supply the hot air to a soaking zone of the roasting furnace; hot gas energy recovery in a boiling cooling bed, wherein a heat exchange device is mounted in an appropriate position of the boiling cooling bed, high-temperature hot gas in the boiling cooling bed is delivered into a cold sand hopper in a mixed sand hopper, and cold sand is pre-heated; energy recovery of regenerated heat pre-coated sand cooled by the boiling cooling bed, wherein the regenerated heat pre-coated sand cooled by the boiling cooling bed is delivered to a sand rolling bucket through a hot sand hopper, and is fully rolled, stirred, and mixed with pre-heated cold sand from the cold sand hopper to achieve heat exchange. The pre-coated sand regeneration system energy recovery method can achieve the comprehensive energy recovery rate of above 70%, and realize a remarkable progress in improving the thermal efficiency and reducing the production cost.

Description

technical field [0001] The invention belongs to the field of foundry engineering, and in particular relates to an energy cascade recovery technology in the foundry industry, in particular to an energy recovery method for a coated sand regeneration system. Background technique [0002] In the foundry industry, waste resin-coated sand is usually recycled by thermal regeneration method, which usually uses a roasting furnace to heat and regenerate waste resin-coated sand, and then cools the regenerated coated sand with a boiling cooling bed , the heat utilization rate of the roaster and its tail gas is very low in the heating and regeneration process, and there is no heat recovery in the boiling cooling process, so it not only wastes the waste heat of the roasting furnace and the boiling cooling bed, but also increases the production cost. Realize efficient use of resources. Contents of the invention [0003] The purpose of the present invention is to provide a method for ene...

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Problems solved by technology

[0002] In the foundry industry, waste resin-coated sand is usually recycled by thermal regeneration method, which usually uses a roasting furnace to heat and regenerate waste resin-coated sand, and then cools the regenerated coated sand with a boiling cooling bed , the heat utilization rate of the roaster and its tail gas is very low in the heating and regeneration process, and there is no heat recovery in the boiling cooling process, so it not only wastes the waste heat of the roasting furnace and the boiling cooling bed, but also increases the production cost. Realize efficient use of resources