Calcium carbide tail gas desulfurization type depth conversion process

Abstract

The invention relates to a calcium carbide tail gas desulfurization type deep conversion process, which solves the problems of complex flow, high investment cost and high operation cost in the existing process. The technical solution includes the following steps: Divide the calcium carbide tail gas into three strands after preheating, the first strand of calcium carbide tail gas and part of the converted product gas are mixed and mixed into steam steam, preheated by the 1# tail gas preheater, and then sent to the 1# converter for conversion; The shift gas from the 1# shift furnace is mixed with the second calcium carbide tail gas, and then sent to the 2# shift furnace for shift after being mixed with steam. The shift gas from the 2# shift furnace is sent to the 1# tail gas preheater and into #The mixed gas in front of the conversion furnace is mixed with the third calcium carbide tail gas after heat exchange and cooling, and then mixed with steam through the 3# steam mixer, preheated by the 2# tail gas heat exchanger, enters the 3# conversion furnace, and exits the 3# conversion furnace After the shifted gas has been further transformed or not, the shifted product gas is obtained through heat energy recovery and condensate separation. The invention has simple process, low investment cost and low operation 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...

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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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