Calcium carbide stove exhaust combustion and utilization method and device

Abstract

The invention provides a combustion utilizing method and a combustion utilizing device of the exhaust gas of a calcium carbide furnace; an exhaust gas discharging tube of the calcium carbide furnace, a heat exchanger, a dust remover, a booster fan and a pipeline used for a combustor are serially connected, and the nozzle of the combustor is inserted into a thermodynamic furnace. The exhaust gas of the calcium carbide furnace is treated with temperature reduction by the heat exchanger, dust removal by the dust remover and pressurization by the booster fan, sent into a combustion gas pipe of the combustor, and finally jetted into the thermodynamic furnace for combustion. The combustion utilizing device of the exhaust gas of the calcium carbide furnace is combined with the thermodynamic furnace and a furnace outlet dust removing system so as to be used in the production of lime or other products or in material parching, thus forming a product manufacturing system integrated with heat utilization, dust removal, purification and standardized discharge of the exhaust gas of the calcium carbide furnace.

Description

technical field [0001] The invention relates to a method and device for treating tail gas of a calcium carbide furnace, in particular to a method and device for burning and utilizing the tail gas of a calcium carbide furnace with the functions of cooling, purifying and pressurizing. Background technique [0002] Calcium carbide furnace gas is the tail gas produced during the production of calcium carbide. There are more than 400 calcium carbide furnaces in China's calcium carbide industry, and the annual output ranks first in the world. However, it has always been a major problem to use the heat energy of the calcium carbide furnace tail gas and to purify and meet the emission standards. The extremely serious pollution has always plagued the healthy development of my country's calcium carbide industry. Calcium carbide furnace tail gas generally has the following characteristics: [0003] 1. The temperature is high and the calorific value is high, which is not convenient for...

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Problems solved by technology

[0003] 1. High temperature and high calorific value are not convenient for fan pressurized transportation. The temperature of semi-closed furnace can reach 350-550°C, and the temperature of fully-sealed furnace can reach 600-1000°C.

[0004] 2. The dust concentration is high, and the semi-closed furnace can reach 8-20g / Nm 3 , the fully enclosed furnace reaches 100-200g / Nm 3 , high CO content

[0006] 4. Contains tar. Generally, when the temperature is lower than 200°C, tar will be precipitated from the calcium carbide furnace gas, which will affect the normal use of dust removal equipment, pipelines and equipment.

[0007] 5. The nature of the dust is special, the dust particles are fine, the specific surface area is large, the specific gravity is light, and it also has a certain viscosity, which is difficult to clean; the dust contains more coke dust, which is relatively abrasive; the specific resistance in the dust is also relatively high

The difficulty lies in the high temperature of the flue gas, the fine and sticky dust, the high content of carbon monoxide, the high content of tar that is easy to precipitate, the large change of the flue gas temperature and other factors, and there is a certain degree of danger.

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