Temperature and pressure control method of dry quenched coke circulating system

Abstract

The invention discloses a temperature and pressure control method of a dry quenched coke circulating system, comprising the following steps of: collecting the coke discharge amount at fixed time; collecting the circulating air volume; correcting the coke discharge amount and the circulating air volume to obtain corrected coke discharge amount and circulating air volume; calculating the matching degree of the coke discharge amount and the circulating air volume according to the corrected coke discharge amount and circulating air volume; calculating the range of a reference value of a group of response parameters based on the corrected coke discharge amount and circulating air volume, wherein the response parameters include coke discharge temperature T2, boiler inlet temperature T6, T3 / T4 temperature, pressure at the top of a prestoring segment, primary dust removal negative pressure, circulating gas combustible components and steam outlet pressure deviation; calculating the range of an alarm value of the group of response parameters; acquiring the real-time data of the group of response parameters, comparing the real-time data with the range of the reference value and the range of the alarm value, if the real-time data is out of the range of the reference value, sending out an adjusting signal, and if the real-time data is within the range of the alarm value, sending out an alarming signal.

Description

technical field [0001] The invention relates to coke-making dry coke quenching technology, more specifically, relates to a temperature and pressure control method of a dry coke quenching cycle system capable of automatic control. Background technique [0002] Dry coke quenching is to use the nitrogen-based carrier gas as the circulating gas to conduct direct heat exchange with the hot red coke in the dry quenching furnace, so as to realize the dry cooling of red coke. The carrier gas that has absorbed the heat of red coke transfers the heat to the waste heat recovery boiler to generate medium-pressure (or low-pressure) steam, and the cooled carrier gas is blown into the CDQ furnace by the circulating fan. The process flow is shown in figure 1 . The technical process of dry coke quenching is a well-known technology in the field, and will not be described here. [0003] In the CDQ process, the red coke and the circulating carrier gas perform direct heat exchange in the CDQ f...

AI Technical Summary

Problems solved by technology

[0006] (1) All manual work, too much experience, different people have different adjustment ranges for parameters and different predictive values ​​for parameters, resulting in poor system stability during the adjustment and control process

[0007] (2) The adjustment of air volume and coke discharge amount is basically a cyclic adjustment, so the number of adjustments is relatively large, and the adjustment is too frequent

[0008] (3) Because in the original CDQ system, the accuracy of the air volume and coke discharge volume is poor, so the accuracy of the empirical benchmark index air-material ratio adjusted in the operation of the CDQ circulation system is also poor

[0009] (4) The coke CDQ circulation system cannot realize linkage. The main reason is that besides the poor accuracy of air volume and coke discharge volume, another reason is that the system changes frequently and it is difficult to grasp the law during the operation, so that the index value drifts The phenomenon is serious. In order to stably control the coke discharge temperature and the boiler inlet temperature, operators need to frequently adjust the air volume or coke discharge volume

[0010] (5) Existing methods are insufficient for the application of T3 / T4 temperature

[0011] (6) Insufficient application of system pressure indicators

[0012] (7) The adjustment of the air introduction in the CDQ furnace circulation system in the existing method is only to control the combustible components in the circulation gas

[0013] (8) The decoking temperature has so far adopted a control standard of no higher than 250°C. In fact, the decoking temperature mentioned in the standard is not the same concept as the decoking temperature actually tested on site, which leads to the control of the decoking temperature. The standard allows too much range, which brings serious insecurity to the system

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