Sulfur-phobic process for deeply transforming calcium carbide tail gas

Abstract

The invention relates to a sulfur-phobic process for deeply transforming calcium carbide tail gas.By the aid of the sulfur-phobic process, problems of complicated procedures and high investment cost and running cost of existing processes can be solved.The technical scheme includes that the sulfur-phobic process comprises steps of preheating the calcium carbide tail gas, then dividing the calcium carbide tail gas into three branches, mixing the first branch of calcium carbide tail gas and partial transformation product gas with each other to obtain a first mixture, filling the first mixture with steam, preheating the first mixture and the steam by a No.1 tail gas preheater, and then delivering the first mixture and the steam into a No.1 transformation furnace to transform the first mixture and the steam; mixing transformed gas exhausted from the No.1 transformation furnace with the second branch of calcium carbide tail gas to obtain a second mixture, filling the second mixture with steam, delivering the second mixture and the steam into a No.2 transformation furnace to transform the second mixture and the steam, delivering transformed gas exhausted from the No.2 transformation furnace into the No.1 tail gas preheater, carrying out heat exchange cooling on the transformed gas and mixed gas before the mixed gas is delivered into the No.1 transformation furnace, then mixing the transformed gas with the third branch of calcium carbide tail gas to obtain a third mixture, filling the third mixture with steam by the aid of a No.3 mixer, preheating the third mixture and the steam by the aid of a No.2 tail gas heat exchanger, feeding the third mixture and the steam into a No.3 transformation furnace, further transforming transformed gas exhausted from the No.3 transformation furnace, recycling heat of the transformed gas, or directly recycling the heat of the transformed gas without further transforming the transformed gas and separating condensed liquid from the transformed gas to obtain transformed product gas.The sulfur-phobic process has the advantages of simplicity and low investment cost and running cost.

Description

technical field [0001] The invention relates to a calcium carbide tail gas conversion process, in particular to a calcium carbide tail gas anaerobic deep conversion process. Background technique [0002] During the production of calcium carbide, a large amount of CO-rich calcium carbide furnace tail gas is produced. "Calbium carbide industry access conditions" (revised in 2007) clearly stated that "calcium carbide furnace gas must be comprehensively utilized". Recycling and utilization of calcium carbide tail gas is of great significance for energy saving, energy saving and emission reduction, and environmental protection. The main components of calcium carbide tail gas are: 70-85% carbon monoxide, 2-10% carbon dioxide, 1-8% nitrogen, 2-10% hydrogen, 0.3-1.0% oxygen, and sulfur, phosphorus, arsenic, chlorine, Trace impurities such as cyanide, tar and soot. Calcium carbide tail gas is a high calorific value mixed gas, which has a wide range of uses. It can not only be used...

AI Technical Summary

Problems solved by technology

There is also an anaerobic conversion process, which prevents high-concentration CO conversion from overheating by adopting a high water-gas ratio scheme, and the steam consumption of this process is high.

At the same time, in order to prevent deactivation of the conversion catalyst, the existing calcium carbide tail gas sulfur-tolerant and sulfur-reversible conversion processes need to carry out rough deoxidation before conversion, but for high-concentration CO deoxidizers, palladium and other precious metals are often used, and the deoxidation investment is high. At the same time The active temperature range of this type of deoxidizer is narrow, and it is easy to cause deactivation of the deoxidizer over temperature.

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