Method and system for automatic chlorine and hydrogen proportioning control of hydrogen chloride synthesis furnace, and synthesis furnace

Abstract

The invention provides a method and system for automatic chlorine and hydrogen proportioning control of a hydrogen chloride synthesis furnace, and the synthesis furnace. The flow rate of chlorine is limited through low-level selection; the flow rate of hydrogen is limited through high-level selection; when the gas flow rate of hydrogen fluctuates and the fluctuation amount is lower than a first hydrogen set threshold value, or when the gas flow rate of chlorine fluctuates and the fluctuation amount is lower than a first chlorine set threshold value, the hydrogen flow rate and the chlorine flowrate are mutually sensed and locked through high-level selection and low-level selection, so that when load adjustment and flow disturbance occur, excessive ratio of hydrogen is ensured, the ratio ofhydrogen is larger than a safe low limit, and generation of free chlorine is avoided. Through adoption of a control strategy based on the cross restriction principle, the function of automatically adjusting the chlorine-hydrogen ratio of the synthesis furnace is realized, and remote automatic control of the chlorine-hydrogen flow ratio of the hydrogen chloride synthesis furnace is realized undera condition of ensuring safe production, so that hidden dangers of on-site safety risks are avoided, and the purposes of automatic people reduction and people substitution can be realized.

Description

technical field [0001] The present disclosure relates to the technical field of chemical synthesis equipment, in particular to a method, system and synthesis furnace for controlling the automatic proportioning of chlorine and hydrogen in a hydrogen chloride synthesis furnace. Background technique [0002] The statements in this section merely provide background related to the present disclosure and do not necessarily constitute prior art. [0003] The production process of the hydrogen chloride synthesis process in the chlor-alkali industry involves dangerous gases such as hydrogen, chlorine, hydrogen chloride, etc. The degree of automation in the traditional production mode is low, and the gas supply operation mainly includes on-site manual operation and remote manual operation. [0004] The inventor of the present disclosure found that the manual operation has the following defects: (1) the furnace pressure of the synthesis furnace is not adjusted in time, resulting in the...

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Problems solved by technology

[0004] The inventors of the present disclosure found that the manual operation has the following defects: (1) The furnace pressure of the synthesis furnace is not adjusted in time, resulting in an imbalance in the proportion of hydrogen and chlorine gas entering the furnace. , free chlorine exceeds the standard, it will react with acetylene gas in the VCM conversion process, generate extremely explosive chloroacetylene and release a large amount of heat, which poses a great threat to safe and stable production; (3) the degree of automation of the hydrogen chloride gas delivery process is relatively backward, The labor intensity is high, the accident rate is high, and production accidents caused by improper manual operation occur from time to time

[0005] In addition, people in the industry have also designed an automatic control method of double closed-loop ratio loop control, such as figure 1 As shown, there are still problems and potential safety hazards in this automatic control method, which can be summarized as the following two points: (1) The molecular weight of hydrogen gas is low, the escape property is good, and the condensed water in hydrogen gas is easy to interfere with the measurement; (2) In the automatic control state, the hydrogen compressor Suddenly stop, the problem of excessive chlorine in hydrogen chloride gas cannot be avoided, and the safety hazard of the production system still exists

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