Integral gasification combined circulation (IGCC) power generation technology coal gasification and desulfurization unit-based ammonia-nitrogen removing device and method

Abstract

The invention discloses an integral gasification combined circulation technology (IGCC) coal gasification and desulfurization unit-based ammonia-nitrogen removing device and method. According to the device, a coal gas condensate inlet is formed in the left upper part of a stripping tower, and low-pressure steam inlet is formed in the left lower part of the stripping tower; the top nozzle of the stripping tower is connected with the upper nozzle of a stripping gas cooler through a pipeline, and the bottom nozzle of the stripping tower is connected with the inlet of a stripping water pump through a pipeline; the outlet of the stripping water pump is connected with a gasification device through a pipeline; the lower nozzle of the stripping gas cooler is connected with the left upper nozzle of a gas-liquid separation tank through a pipeline; the upper nozzle of the gas-liquid separation tank is connected with a sulfur removing and reclaiming device through an ammonia-containing acid gas pipeline; the bottom nozzle is connected with the inlet of a condensate return pump through a pipeline; and the outlet of the condensate return pump is connected with the right upper nozzle of the stripping tower through a pipeline. The device has the beneficial effects that the ammonia-nitrogen accumulation of a desulfurizing agent MDEA solution system can be reduced, the coal gasified gas desulfurizing agent MDEA solution degradation speed can be retarded, and the service cycle can be prolonged.

Description

technical field [0001] The invention relates to the technical field of coal gasification and desulfurization technology of integrated coal gasification combined cycle power generation technology (abbreviated as IGCC), in particular to an ammonia nitrogen removal device and method based on the coal gasification and desulfurization unit of the integrated coal gasification combined cycle power generation technology. Background technique [0002] In the field of IGCC coal gasification and desulfurization, the coal gasification gas contains a large amount of ammonia components. After passing through the water system in the coal gasification device, part of the ammonia nitrogen enters the water body, and the rest enters the downstream purification device with the coal gasification gas, and passes through the coal gasification gas. Condensation, carbon oxysulfide hydrolysis, methyldiethanolamine (MDEA) solution absorbs hydrogen sulfide, the gas is purified, and the purified gas is s...

AI Technical Summary

Problems solved by technology

However, the water body produced by the condensation of coal gasification gas contains a large amount of ammonia nitrogen, which eventually enters the water body of the coal gasification device; after the coal gasification gas is exposed to the MDEA solution, part of the ammonia nitrogen component remains in the MDEA solution, and after a certain period of time, the MDEA solution deteriorates , the desulfurization capacity is reduced, which seriously affects the safe and stable operation of the device

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