Method for synthesizing ammonia

Abstract

The invention provides a method for synthesizing ammonia. The method for synthesizing ammonia includes providing an air separation system, an oxygen-increasing blower, an upblown oxygen-increasing air valve, a gas furnace, a scrubber and a gas cabinet, and the pure oxygen and air from the air separation system are used in the described oxygen-increasing blower Oxygen-increased air is made inside, the oxygen-increased air is mixed with low-pressure superheated steam, and then enters the top of the gas furnace through the upper gas channel, and the high-temperature gas generated by the reaction of oxygen-increased air, steam and carbon in the gas furnace enters the scrubber through the lower blowing device. Gas tower; carry out blowing up again. The method realizes oxygen concentration regulation and control. On the basis of the traditional fixed-bed batch gasification process, the oxygen concentration in the furnace air is increased from 21% to 25%-70%. According to the change of raw material conditions, the oxygen concentration in the furnace air is adjusted as needed, and the down blowing is increased to stabilize the fuel layer. layers to reduce heat loss. On the basis of fixed-bed oxygen-enriched continuous gasification, the downblown gas stage is added in each cycle, and the sensible heat of the upward gas is recovered.

Description

【Technical field】 [0001] The invention relates to a fixed-bed gasifier batch gasification process for producing synthetic ammonia, and specifically designs a method for synthesizing ammonia. 【Background technique】 [0002] The air from the atmosphere is pressurized to 26kPa by the blower, and is used for the gas making furnace through the blowing valve of each furnace. The air and steam enter the gas furnace intermittently, and are blown, blown up, blown down, blown up twice, and blown clean. In this stage, semi-water gas is produced for use in the later section. The steam produced by the jacketed boiler of the gas furnace is desuperheated by the waste heat boiler through the pipeline, and then transported to the low pressure steam main pipe by the superheating pipe for the gas furnace to use. [0003] Features of traditional fixed-bed batch gasification process: mature technology and simple operation; high effective components in the gas, the average effective gas (CO+H2) ...

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Problems solved by technology

[0003] Features of traditional fixed bed batch gasification process: mature technology and simple operation; the effective components in the gas are relatively high, the effective gas (CO+H2) blown up is 85% on average, and the effective gas blown down is 96% on average; the applicable coal types are wide; investment less; the blowing efficiency is low, and the gas production of a single furnace is low. Since the oxygen required for combustion in the gasifier comes from the atmosphere, the oxygen concentration is low (21%), and the heat released by the reaction with charcoal per unit time is small, so it can only be extended by extending the blowing time To increase the temperature of the gasification layer, resulting in low blowing efficiency, low energy utilization rate, and low gas production of a single furnace; environmental pollution is large, and the generated blowing gas contains dust, carbon dioxide and sulfide, which is discharged into the atmosphere and pollutes the environment

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