Waste heat recovery method for fused calcium carbide

Abstract

The invention discloses a waste heat recovery method for fused calcium carbide. The waste heat recovery method comprises the following steps that the fused calcium carbide is subjected to forced air cooling, heat is recovered, and by controlling the magnitude of air flow, the purpose that the calcium carbide uniformly releases heat in the forced air cooling process is achieved. According to the waste heat recovery method for the fused calcium carbide, the effect that the calcium carbide uniformly releases the heat is achieved through forced air cooling and controlling over the magnitude of the air flow, and the problems that natural cooling is long in consumption time, the waste heat of the calcium carbide cannot be recycled, heat releasing of calcium carbide subjected to common forced air cooling is discontinuous and uneven, and waste heat recovery is not facilitated are solved.

Description

technical field [0001] The invention relates to a method for recovering waste heat of molten calcium carbide. Background technique [0002] There are more than 1,000 calcium carbide furnaces in my country's calcium carbide industry, and its annual output ranks first in the world. In 2010, my country's calcium carbide output reached 22 million tons per year, and China has become the country with the largest calcium carbide production and consumption in the world. [0003] As we all know, calcium carbide furnace gas has its own latent heat and sensible heat. For a single 45,000-ton / year calcium carbide furnace to recycle the heat energy of the furnace gas, it is equivalent to saving 7,000 tons of standard coal. If calculated on the basis of my country's calcium carbide production capacity of 22 million tons per year, the country can save 3.3 to 3.5 million tons of standard coal per year. [0004] The temperature of the molten calcium carbide released from the furnace is as hi...

AI Technical Summary

Problems solved by technology

[0004] The temperature of the molten calcium carbide released from the furnace is as high as 1800-1900 degrees, with high heat enthalpy and high heat; at present, in the calcium carbide production plant, after the calcium carbide in the molten state is discharged from the furnace, it is placed in the air for a long time to be cooled naturally or forced to cool by blasting. It is unreasonable to let a large amount of heat energy be dissipated arbitrarily

Its main disadvantages are that the heat of dissolution (latent heat) released when the molten calcium carbide is solidified and the heat (sensible heat) released during the cooling process after solidification have not been recycled; the first is that it takes a long time to cool naturally and the production efficiency is low; and Because the solidification cooling process is carried out indoors, a large building area is required, and the use of blowers for forced cooling consumes a lot of electricity and blows away the heat of calcium carbide

[0005] In order to recover the large amount of heat released during the solidification and cooling of molten calcium carbide, in order to save energy and reduce consumption, many years of research and practice have been carried out abroad, especially in Japan, which is poor in energy resources, and various heat recovery processes have been proposed. Most of the equipment and equipment adopt the direct heat exchange method to produce steam for power generation and heating. The heat exchange efficiency of the above-mentioned method is high, but the requirements for equipment processing and production process control are relatively high, and leakage at any point will cause major accidents

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