A high-efficiency cooling device for calcium carbide waste heat recovery

Abstract

The invention discloses a high-efficiency cooling device for calcium carbide waste heat recovery. By setting an inner heat exchange cylinder and an outer heat insulation cylinder, an annular flow channel is arranged between the inner heat exchange cylinder and the outer heat insulation cylinder. The inner and outer walls act as the main heat exchange interface. When calcium carbide is cooled, fan blade arrays and a number of cooling water nozzles are arranged inside the inner heat exchange cylinder. The cooling water nozzles spray the cooling water in the main water pipe onto the inner wall of the inner heat exchange cylinder. The calcium carbide in the annular flow channel performs heat exchange; the outer heat-insulating cylinder can rotate relative to the inner heat-exchanging cylinder, and with the first scraper, it can not only realize the drainage of calcium carbide, but also clean the outer wall of the inner heat-exchanging cylinder. For calcium carbide furnaces below the 48MVA level, the present invention can cool the molten calcium carbide at 2000°C to about 1400°C within 30 minutes; and realize the granulation of calcium carbide solids at the outlet section to realize efficient production of calcium carbide.

Description

【Technical field】 [0001] The invention belongs to the technical field of calcium carbide cooling, and relates to a cooling device, in particular to a high-efficiency cooling device for recovering calcium carbide waste heat. 【Background technique】 [0002] At present, the industrial production of calcium carbide is to use the arc heat generated by the three-phase carbon electrode of the calcium carbide furnace to cause the two raw materials of coke and lime to undergo a solid-phase melting chemical reaction to generate high-temperature molten calcium carbide at about 2000 °C. Calcium carbide is mainly cooled naturally by placing it in a container made of cast iron. This method has the following defects. One is that high-grade heat energy is wasted in large quantities, and the other is that natural cooling will cause certain thermal pollution and environmental pollution. Dust pollution, the third is that due to its high temperature, it needs to be placed in a special factory b...

AI Technical Summary

Problems solved by technology

Calcium carbide is mainly cooled naturally by placing it in a container made of cast iron. This method has the following defects. One is that high-grade heat energy is wasted in large quantities, and the other is that natural cooling will cause certain thermal pollution and environmental pollution. Dust pollution, the third is that due to its high temperature, it needs to be placed in a special factory building that has undergone refractory treatment, which reduces the turnover efficiency of the enterprise and increases the production cost

The main reasons for the waste of these high-grade heat energy are insufficient heat recovery means and low efficiency

Calcium carbide in the molten state is close to 2000°C, but has low thermal conductivity, high viscosity, and reacts with nitrogen and water, so it is difficult to use traditional methods

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