Energy-saving lime kiln

Abstract

The invention discloses an energy-saving lime kiln, which aims to solve the problems that heat energy is wasted because smoke discharged by the conventional lime kiln is not utilized and fuel consumption is increased because the preheating temperature of combustion-supporting air of the lime kiln is low. The energy-saving lime kiln comprises a kiln body, wherein a preheating zone, a calcining zone and a cooling zone are sequentially on the kiln body from top to bottom; a kiln gas outlet pipe is arranged above the preheating zone; a normal-temperature air input device and a preheated air inputdevice fixed on the normal-temperature air input device are arranged in the cooling zone; each of the normal-temperature air input device and the preheated air input device comprises an air pipe and an air cap connected with an air outlet of the air pipe; the air cap of the preheated air input device is arranged above the air cap of the normal-temperature air input device; the two air caps form adouble-layer air cap structure; the kiln gas outlet pipe is connected with an air inlet of a heat exchanger; a heat exchange pipe is arranged in the heat exchanger; a cold air inlet of the heat exchange pipe is connected with an air blower; a hot air outlet of the heat exchange pipe is connected with the air pipe of the preheated air input device; and an air outlet of the heat exchanger is connected with a draft fan.

Description

technical field [0001] The invention relates to a material calcining device, in particular to a high-efficiency and energy-saving lime kiln for calcining lime. Background technique [0002] At present, the flue gas of most lime kilns is directly discharged, and the average temperature of the discharged flue gas is between 250°C and 300°C. The high-temperature flue gas is directly discharged to waste the heat. As the combustion aid of the lime kiln, air is continuously fed into the lime kiln. The combustion temperature in the lime kiln is very high, generally around 1100°C, and the air combustion aid will also reach a very high temperature when it supports combustion. At present, the commonly used method is to feed normal temperature air into the cooling zone of the lime kiln. The normal temperature air cools the lime in the cooling zone first, and at the same time preheats itself. The preheated air is used as combustion air, but these preheated air The temperature is ...

AI Technical Summary

Problems solved by technology

[0004] The present invention overcomes the disadvantages that the flue gas discharged from the existing lime kiln is not utilized and heat energy is wasted, and the low preheating temperature of the combustion-supporting air in the lime kiln increases the fuel consumption, and provides an energy-saving lime kiln which fully utilizes the The waste heat of the flue gas discharged from the lime kiln, and the preheating temperature of the combustion air of the lime kiln is high, which saves energy and reduces costs

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