A safety protection method and system for automatic regulation of CDQ boiler water level

Abstract

The invention provides a safety protection method and system for automatic water level regulation of a CDQ (Coke Dry Quenching) boiler. The method comprises the steps of arranging a first drum liquidlevel monitoring point and a second drum liquid level monitoring point at a boiler drum, wherein the first drum liquid level monitoring point and the second drum liquid level monitoring point are at the same height of the boiler drum; obtaining a first liquid level detecting value T of the first drum liquid level monitoring point and a second liquid level detecting value S of the second drum liquid level monitoring point; presetting a boiler drum liquid level threshold D1, a process setting range maximum liquid level value D2 and a process range minimum liquid level value D3; and when the absolute value of the result of T minus S is greater than D1 or when T is greater than D2 or less than D3, or when S is greater than D2 and less than D3, stopping the automatic water level adjustment of the CDQ boiler and starting the manual water level adjustment of the CDQ boiler. When the automatic water level adjustment of the CDQ boiler is abnormal, manual adjustment can be switched in time; misjudgment of the automatic adjustment can be strictly controlled; and the safety of the automatic water level adjustment of the CDQ boiler is increased.

Description

technical field [0001] The present application relates to the field of CDQ coking equipment, in particular to a safety protection method and system for automatically adjusting the water level of a CDQ boiler. Background technique [0002] The CDQ boiler is an important part of the CDQ system. The CDQ boiler uses the high-temperature circulating gas that absorbs the sensible heat of red coke to exchange heat with pure water for desalination and deoxygenation to generate steam with rated parameters and quality. During the coking process of the CDQ boiler, the water level of the CDQ boiler is automatically adjusted by the CDQ boiler water level automatic adjustment system. [0003] At present, there are two balance containers (drum liquid level gauges) in the steam drum liquid level automatic adjustment system of the CDQ boiler, which are distributed on both sides of the same height of the steam drum. The differential pressure signal of the level gauge is transmitted to the DC...

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Problems solved by technology

[0004] However, when the pressure guiding pipe of any one of the drum liquid level gauges is blocked, and the upper computer does not find that the received differential pressure signal data is wrong, the average value of the liquid level signal is not true, and the water level is continuously monitored. If the valve uses the original automatic adjustment, there may be a high liquid level alarm, resulting in the interlock shutdown of CDQ coking equipment, affecting CDQ coking

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