A device for accurately measuring the pressure difference at the slag outlet of a gasifier and its measuring method

Abstract

The invention discloses a device for accurately measuring pressure difference of a slag hole of a gasification furnace and a measurement method thereof, provides an accurate measurement method for the pressure difference of the slag hole of an entrained flow bed pressurized gasification furnace, and aims to improve the safety and the reliability of long-period operation of the gasification furnace and reduce the frequency of accidental shutdown of a gasification device. According to the device for accurately measuring the pressure difference of the slag hole of the gasification furnace, the upper part of a scrubbing cooling pipe of the gasification furnace is provided with a hole; the wall of the gasification furnace in the upper space of the scrubbing cooling pipe is provided with a hole; the two holes are connected by using a pipeline with an expansion joint; a high-pressure nitrogen pipeline is connected with the hole in the wall of the gasification furnace through a nitrogen blow valve and a check valve of the scrubbing cooling pipe to continuously introduce high-pressure nitrogen to the scrubbing cooling pipe. Thus, the pressure of the scrubbing cooling pipe measured through pressure tapping of the pipeline is instant pressure of crude synthesis gas after the crude synthesis gas passes through the slag hole, and the pressure difference with a combustion chamber is actual pressure difference of the slag hole of the gasification furnace. The technical defect of display lag of the pressure difference of the slag hole of the gasification furnace is overcome, the operation state of the gasification furnace can be timely and accurately displayed, and the reliability of the long-period operation of the system is improved.

Description

technical field [0001] The invention relates to a measurement technology capable of accurately measuring the pressure difference at the slag outlet of an entrained bed pressurized gasification furnace. Background technique [0002] Among the many coal gasification technologies, the entrained entrained bed pressurized coal gasification technology has technical advantages such as strong adaptability to coal types, low raw material consumption, high carbon conversion rate, and easy large-scale expansion. Dimethyl ether, olefins, raw material gas for direct and indirect coal liquefaction processes, and fuel gas for IGCC power generation are key technologies for efficient and clean utilization of coal. [0003] With the increase in the scale of coal chemical plants and the extension of the industrial chain, the impact of the start-up period of the gasification plant on the project has become increasingly prominent. In a large-scale coal chemical project, if there is an unplanned...

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Problems solved by technology

There is a certain distance between the pressure measurement point of the syngas pipeline and the slag port of the gasifier, and the data measured by the differential pressure gauge cannot accurately and timely reflect the actual state of the slag port of the gasifier

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