Coal gas combined purification tower

Abstract

The invention relates to a coal gas combined purification tower. A vertical tower body sequentially comprises a coal gas cooling section, a tar removal section, a desulfurization section and a naphthalene removal section from bottom to top, which are connected with in series. The coal gas sequentially passes through the coal gas cooling section, tar removal section, desulfurization section and naphthalene removal section to implement purification. The coal gas section can further lower the coal gas temperature, enhance the adsorption effects of the desulfurizer and activated carbon, lower the dew point of the coal gas, reduce the moisture carried in by the previous section and avoid polluting the desulfurizer and activated carbon. The tar removal section can trap most tar fog carried in the coal gas, greatly lower the possibility of accumulation of the tar in the desulfurizer filler layer, prolong the service life of the desulfurizer filler layer and shorten the filler replacement period. The desulfurization section and naphthalene removal section are arranged in series to reduce the quantity and occupied area of equipment, enhance the production efficiency and lower the production cost.

Description

technical field [0001] The invention relates to a combined coal gas purification tower used for deep purification of coal gas in a coke oven gas deep processing process. Background technique [0002] After preliminary purification of coke oven gas, it still contains a small amount of hydrogen sulfide (<200mg / Nm 3 ) and naphthalene (<500mg / Nm 3 ), in some occasions that require a high degree of gas purification (such as gas-to-methanol, gas-to-LNG, etc.), deep purification of the gas is required to further remove a small amount of hydrogen sulfide and naphthalene contained in the gas. [0003] The traditional coal gas deep purification process separates the desulfurization and naphthalene removal processes, resulting in high equipment investment costs, cumbersome process operations, and the service life of desulfurizer fillers and activated carbon fillers is greatly affected by the previous process. Contents of the invention [0004] The technical problem to be solv...

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Problems solved by technology

[0003] The traditional coal gas deep purification process separates the desulfurization and naphthalene removal processes, resulting in high equipment investment costs, cumbersome process operations, and the service life of desulfurization agent packing and activated carbon packing is greatly affected by the previous process.

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