Calcium carbide furnace tail gas dry dedusting, waste heat recovery and synthesis gas production device

Abstract

The invention discloses a calcium carbide furnace tail gas dry dedusting, waste heat recovery and synthesis gas production device. The device comprises calcium carbide furnaces, a high-temperature calcium carbide tail gas dedusting system, a calcium carbide tail gas component reforming system, a high-temperature calcium carbide tail gas waste heat recovery system and a low-temperature calcium carbide tail gas deep purification system sequentially connected via pipelines, and the low-temperature calcium carbide tail gas deep purification system is provided with a gas fan. Dust carried in calcium carbide furnace tail gas can be removed at high temperature, CO in tail gas is partially converted by performing sulfur tolerant conversion with the aid of own high temperature of the calcium carbide furnace tail gas and contained sulfur so as to regulate carbon hydrogen ratio in the tail gas, then waste heat in the high-temperature tail gas is recovered to generate steam, the steam produced with the recovered waste heat serves as high-temperature dedusting counter-blow gas to enter the system to serve as conversion steam, and finally mixed tail gas is purified to obtain pure synthesis gas meeting the requirement of carbon 1 chemical production.

Description

technical field [0001] The invention relates to the field of high-efficiency recovery and utilization of calcium carbide furnace tail gas energy and resources, in particular to a calcium carbide furnace tail gas dry dust removal-waste heat recovery-production synthesis gas device. Background technique [0002] Calcium carbide is a basic organic chemical raw material. China is the largest producer of calcium carbide in the world, but at the same time, the calcium carbide industry is an industry with high energy consumption and high pollution. The technology of calcium carbide furnace tail gas treatment has been a difficult problem for the calcium carbide industry for many years and it is difficult to solve . [0003] Calcium carbide production per ton of calcium carbide by-product furnace gas is about 400Nm 3 , The main component of the furnace gas is high-temperature CO. The high-temperature furnace gas itself has a large amount of waste heat that can be used, and it can al...

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Problems solved by technology

[0006] The problem in the purification process of waste heat boiler + bag dust removal is that due to the influence of high content of dust in the tail gas of calcium carbide, the dust on the heating area of ​​the boiler deteriorates the heat transfer effect, the efficiency of the boiler drops sharply, and the temperature of the exhaust gas is difficult to cool to the design temperature. The subsequent bag filter Because the bag cannot withstand the high temperature and the bag is burned, the operation effect of this process is not ideal, and it is very difficult to operate stably.

[0007] Forced cooling plus bag dust removal is to cool the high-temperature exhaust gas to the range that the bag can withstand through cooling water or direct cooling (generally direct cooling), and then enter the bag filter for dust removal. This technology first loses the waste heat of high-temperature exhaust gas, and second It requires a large amount of cooling water to be circulated and sprayed, consumes a lot of water and energy, and produces difficult-to-treat sewage, which is not economical and environmentally friendly.

[0008] The main problem of the purification of calcium carbide furnace tail gas by electrostatic precipitator technology is that the nature of the dust contained in the calcium carbide tail gas is relatively special. The dust contains more coke dust, and the specific resistance of the dust is relatively high. Even if the dust ratio is adjusted by humidity adjustment or other technologies resistance, and the dust removal efficiency is low and fluctuates greatly, it is difficult to ensure the stable operation of the system and meet the purification requirements

[0009] In summary, the existing calcium carbide furnace tail gas treatment technology cannot meet the requirements of high-temperature calcium carbide furnace tail gas purification and energy and resource recovery, and the energy and resource utilization efficiency is low

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