Smoke waste heat utilization type preheater of lime rotary kiln

Abstract

The invention discloses a smoke waste heat utilization type preheater of a lime rotary kiln. The smoke waste heat utilization type preheater of the lime rotary kiln comprises a combustion chamber; the combustion chamber is composed of a guide cone and a suspended ceiling; preheating bins arranged at equal intervals are arranged on the circumferential outer wall of the combustion chamber, and a smoke exhaust pipe is arranged at the top of each preheating bin; a discharging groove is formed in the top of the position, on one side of each smoke exhaust pipe, of the corresponding preheating bin; a material guiding bin communicated with the rotary kiln is arranged below the guiding cone; a combustor is arranged on the suspended ceiling; and a combustion fan is installed on the combustor. The device has the beneficial effects that by-product gas generated by steelmaking is recovered, and then combusted and heated, in cooperation with flue gas generated during calcination in the rotary kiln, so that limestone in the preheating bins can be heated, the utilization efficiency of the by-product gas is improved, high-calorific-value fuel consumed during limestone calcination is reduced, and then the production cost is reduced.

Description

technical field [0001] The invention relates to the field of lime rotary kilns, in particular to a lime rotary kiln flue gas waste heat utilization type preheater. Background technique [0002] Blast furnace gas is a by-product combustible gas in the process of blast furnace ironmaking. Due to its low calorific value and limited utilization value, it is often discarded by steel mills, and lime is an important auxiliary material necessary for steel mills in steelmaking, sintering and other links. The rotary kiln is usually used for lime calcination production. Since the limestone is at room temperature before cutting, it needs to be preheated before being put into the rotary kiln for production, which can shorten the calcination time of limestone and increase the output. [0003] Since the fuel used for lime calcination in the rotary kiln is a high-calorific value fuel, the temperature of the flue gas inside the rotary kiln is relatively high after combustion, and the flue g...

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Problems solved by technology

[0003] Since the fuel used for lime calcination in the rotary kiln is a high-calorific value fuel, the temperature of the flue gas inside the rotary kiln is relatively high after combustion, and the flue gas generated during calcination in the rotary kiln is usually used to preheat the limestone. Heat, the heat loss rate of the flue gas is fast, when the temperature of the flue gas inside the rotary kiln is lower than 1250°C, the temperature of the flue gas at this time is not enough to fully preheat the limestone, the heat exchange efficiency is greatly reduced, and the preheating of the limestone is increased. The heating time will affect the subsequent calcination process of limestone. The internal temperature of the rotary kiln can only be increased by increasing the supply of high calorific value fuel, but this method will increase the production cost. For low calorific value gas, the combustion produced The temperature of the flue gas is often lower than 1050°C~1100°C, which has no use value in the rotary kiln. If it is passed into the rotary kiln, the temperature in the kiln will be lowered and the gas circulation will be disturbed, which cannot meet the current production needs.

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