Ammonia washing tower and anti-corrosion shift gas ammonia washing device and process using same

Abstract

The invention belongs to an ammonia washing tower and an anti-corrosion shift gas ammonia washing device and process using the ammonia washing tower. The device comprises a pre-process shift gas pipeline, and the pre-process shift gas pipeline is connected with a shift gas inlet of an ammonia washing tower through a water cooler shell pass; the ammonia washing tower sequentially comprises a flashevaporation section, a cooling section, an ammonia washing section and a pre-washing analysis section from bottom to top, a shift gas inlet is formed in one side of the flash evaporation section, anda flash evaporation condensate outlet is formed in the bottom of the flash evaporation section; the cooling section comprises a chilled water cooler; the ammonia washing section comprises a pluralityof layers of float valve trays and a gas distribution cap assembly; a shift gas outlet is formed in the top of the pre-washing analysis section; a desalted water inlet is formed in one side of the pre-washing analysis section. The device has the advantages that ammonia gas can be uniformly absorbed in the ammonia washing section on the premise of improving the solubility of the ammonia gas, and the pH of condensate is neutral after the ammonia gas, carbon dioxide and other acidic gases are dissolved in water, so that the acidic environment in the ammonia washing tower is changed, and internalparts or linings of the ammonia washing tower are prevented from being corroded.

Description

technical field [0001] The invention belongs to the technical field of coal chemical gas purification, and in particular relates to an ammonia washing tower and an anti-corrosion conversion gas washing ammonia device and process using the same. Background technique [0002] Coal gasification process gas contains CO, H 2 , CO 2 And water and other components, generally through the CO shift process to convert part or all of the CO into H 2 , and the separation of each effective component is completed through a low-temperature methanol washing process. Before the shift gas enters the low-temperature methanol washing process, set up an ammonia scrubber to remove trace amounts of NH in the shift gas by using desalinated water 3 Prevent the accumulation of ammonia in the low-temperature methanol washing unit. Due to the acidic components such as carbon dioxide and hydrogen sulfide contained in the shift gas, the ammonia scrubber is in an acidic environment for a long time duri...

AI Technical Summary

Problems solved by technology

Due to the acidic components such as carbon dioxide and hydrogen sulfide contained in the shift gas, the ammonia scrubber is in an acidic environment for a long time during the working process. This acidic environment has caused serious corrosion to the internal parts and lining of the ammonia scrubber. The risk of gas leakage; in view of the corrosion phenomenon of the above-mentioned ammonia washing tower, the general enterprises delay the corrosion by improving the internal parts or lining materials, and the cost of this type of material itself is relatively high, and the maintenance cost in the later period is also high, so it is impossible to fundamentally To solve the above corrosion problems

The carbon dioxide in it is the main process gas used in the later stage, so it cannot be separated. Based on the long-term existence of this acidic environment, the ammonia washing tower has been in the above-mentioned operating environment with potential safety hazards for a long time

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