System for determining steam-gas ratio of inlets of all shift converters at conversion section of tandem type synthesis ammonia plant

Abstract

The invention relates to a system for determining the steam-gas ratio of inlets of all shift converters at the conversion section of a tandem type synthesis ammonia plant. The system comprises an intelligent secondary meter cluster unit with a communication function and a gas composition analytical unit, wherein a temperature adjusting device is arranged between two adjacent shift converter sections; a temperature adjusting method comprises the steps of adding steam, spraying water for chilling and heat exchange; the determination system comprises a sensor group unit arranged on a series-connected line of a plurality of shift converter sections and pipelines, the sensor group unit comprises a sensor combination arranged in a main pipeline in front of a shift converter section to be detected for determining the temperature and the pressure of gas in the main reaction pipeline before steam adding or cold water chilling, a sensor combination for determining the temperature and the pressure of the gas in the main reaction pipeline after steam adding or cold water chilling, and a sensor combination for measuring the temperature and the pressure of chilled water or steam in a pipeline where the steam or chilled water is added. The system can statically, automatically and continuously measure the steam-gas ratios of all shift converter sections.

Description

technical field [0001] The invention relates to a test technology for a synthetic ammonia plant, in particular to a system for measuring the steam-gas ratio at the inlet of each converter in the converter section of the serial ammonia plant. Background technique [0002] The carbon monoxide (CO) shift section of the ammonia plant is a key step in the production of ammonia, and its main task is to convert CO in the shift gas into CO 2 and H 2 . Since the CO change process is a strong exothermic process, it must be carried out in sections to facilitate the recovery of reaction heat and control the residual CO content in the outlet of the conversion furnace section in the conversion section. In addition, for the convenience of controlling the temperature of each shift furnace section in the CO shift section, at the same time adding reactant raw materials to each shift furnace section for convenience. At present, the CO conversion section of an ammonia plant often adopts a mu...

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Problems solved by technology

The prior art also discloses a steam-to-dry gas ratio tester in the process of adding steam, which can only be used to measure the steam-gas ratio in the process of adding steam at the inlet of the first stage of the shift furnace, and for the first The steam-to-gas ratio at the inlet of other shift furnace sections outside the first-stage shift furnace section cannot be measured, that is, the steam-to-gas ratio involved in the water spray quenching process between the first and second shift furnace sections cannot be measured

The prior art also relates to a humidity method for measuring the ratio of water vapor and dry gas. This method can measure the ratio of steam and dry gas under various conditions, but due to sensor performance limitations, the gas to be measured can only be drawn out for high temperature and high pressure conditions. For measurement, the measurement cost is increased and the gas above 250°C cannot be measured under the existing conditions

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