An oxidation furnace process interlock control method

Abstract

The invention discloses a process interlocking control method for an oxidation furnace. The method includes furnace water circulation amount interlocking of the oxidation furnace, temperature interlocking of the oxidation furnace and ratio interlocking of ammonia-air ratio. The temperature interlocking of the oxidation furnace includes low temperature interlocking of the oxidation furnace and high temperature interlocking of the oxidation furnace; the ratio interlocking of ammonia air ratio includes high ratio interlocking of ammonia-air ratio and low ratio interlocking of ammonia-air ratio. The method improves the security level of the system and makes the system develop in the direction of triple redundancy. The DCS and ESD mutual communication unit can interlock with the process, the process can also interlock with the unit, automation degree in mutual protection is high, personnel operation is reduced, and safety in operation is assured.

Description

technical field [0001] The invention relates to an oxidation furnace process interlocking control method. Background technique [0002] At present, the interlocking automation degree of the oxidation furnace process is low, and the air and ammonia gas pipelines entering the oxidation furnace figure 2 As shown, there is no dual pressure venturi flowmeter and double pressure orifice flowmeter; instead, a single pressure double differential transmitter is used such as image 3 As shown, single pressure dual pressure transmitter such as Figure 4 As shown, the thermometer is shared by a single piece; the reliability, accuracy and safety of the flow measurement value are poor. [0003] Instead of installing a group of thermocouples at 180-degree intervals on the circumference of the oxidation furnace body, each group is armored with three thermocouples, and there is no logical operation of two out of three in the DCS; instead, single or double thermocouples are used, such as ...

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Problems solved by technology

[0002] At present, the interlocking automation degree of the oxidation furnace process is low, and the air and ammonia gas pipelines entering the oxidation furnace figure 2 As shown, there is no double-induced pressure Venturi flowmeter, double-induced pressure orifice flowmeter; instead, a single-induced pressure and double-differential transmitter is used such as image 3 As shown, single pressure dual pressure transmitter such as Figure 4 As shown, the thermometer is shared by a single piece; the reliability, accuracy and safety of the flow measurement value are poor

[0003] Instead of installing a set of thermocouples at 180-degree intervals on the circumference of the oxidation furnace body, each set is armored with three thermocouples, and there is no logical operation of two out of three in the DCS; instead, single or double sets of thermocouples are used, such as image 3 , 4 as shown: direct calculation, poor reliability, precision and safety of temperature measurement value

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