A method for starting up a gasifier to meet oxygen

Abstract

The invention discloses a start-up oxygen introduction method for a gasification furnace. The start-up oxygen introduction method comprises the following steps: (1) constructing a pressurizing pipeline; (2) keeping an oxygen boundary valve closed, opening an oxygen flow control valve for adjustment, opening an oxygen upstream nitrogen blockage valve, closing an oxygen downstream nitrogen blockage valve, closing an oxygen emptying valve, opening a high-pressure nitrogen pressurizing valve to perform nitrogen pressurization on the pipeline behind the oxygen boundary valve, and closing the high-pressure nitrogen pressurizing valve when the pressure difference of the oxygen boundary valve prior to and after the opening of the valve is less than 0.3 MPa, to complete a pre-startup stage pressure averaging process; (3) closing the oxygen flow control valve for adjustment, closing the oxygen upstream nitrogen blockage valve and the oxygen downstream nitrogen blockage valve, opening the oxygen emptying valve, opening the oxygen boundary valve when the pressure difference of the oxygen boundary valve prior to and after the opening of the valve is less than 0.4 MPa to introduce oxygen, and controlling the oxygen flow under the adjustment of the oxygen flow control valve, to complete the oxygen introduction process. According to the start-up oxygen introduction method, nitrogen is used for averaging the pressure, so that high-flowing-speed oxygen cannot be generated during pressure averaging with the oxygen, and the operation risk of the start-up oxygen introduction process of the gasification furnace is reduced.

Description

technical field [0001] The invention relates to a safe oxygen-receiving method for starting up a gasifier, in particular to a method for safely introducing oxygen when starting up a gasifier of a coal chemical plant. Background technique [0002] In the coal chemical plant, the gasifier is the core equipment, and the gasification reaction is carried out in the gasifier. The gasification reaction is mainly a rapid partial oxidation-reduction reaction of raw coal and high-purity oxygen at a certain temperature and pressure. Before the start-up of the gasifier, it is necessary to welcome the high-pressure oxygen in the oxygen main pipe outside the boundary area to the boundary area of ​​the gasification device to vent and establish a suitable oxygen flow rate and pressure to prepare for the start-up and feeding. [0003] The prior art method of starting the gasifier to meet oxygen is to connect a small-diameter oxygen pressure equalizing valve (or auxiliary line valve) in para...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a safe and reliable gasifier start-up oxygenation method using high-pressure nitrogen charging for pressure equalization, so as to solve the technical problem of safety risks in the prior art gasifier start-up oxygenation method

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