Method for controlling temperature of heat-transfer medium (HTM) furnace evaporator

Abstract

The invention discloses a method for controlling the temperature of an HTM furnace evaporator. The method mainly includes that the temperature of a secondary HTM outlet is taken as a main object, the temperature of a primary HTM inlet is taken as an auxiliary object, and a main regulator and an auxiliary regulator are set correspondingly; the main regulator compares parameters sent by the main object with a predetermined value to acquire a main error signal and performs a proportion integration difference (PID) algorithm operation to obtain an output main controlled quantity as a set value of the auxiliary regulator; and the auxiliary regulator main regulator compares parameters sent by the auxiliary object with the set value to acquire an auxiliary error signal and performs the PID algorithm operation to obtain an output auxiliary controlled quantity as an input signal of an actuator. According to the method, the temperature of the secondary HTM outlet is subjected to operation process by a PID control loop of the outer ring main regulator, and output signals are transmitted to a PID control loop of the auxiliary regulator, subjected to comparison operation process with the temperature of the primary HTM, and converted into control signals which are output to the actuator so as to control a regulating valve of the primary HTM inlet.

Description

technical field [0001] The invention relates to the field of spinning heat medium circuit evaporators, in particular to a temperature cascade PID control method for a heat medium furnace evaporator. Background technique [0002] In the process of chemical fiber production, the spinning box needs to be kept warm and heated, and the temperature of the spinning box is adjusted according to the requirements of the spinning varieties produced. Therefore, the temperature needs to be controlled within a certain range. The existing heat medium furnace evaporator temperature control technology is relatively mature. For example, the temperature control method of the heat medium furnace evaporator of Beijing Zhongli Machinery Engineering Technology Co., Ltd. (referred to as "Zhongli Machinery") has the following characteristics: After the outlet temperature of the secondary heat medium is processed by the PID control loop of the main regulator of the outer loop, its output signal is t...

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Problems solved by technology

[0003] The disadvantage of the design of the above temperature control system is that when the primary heating medium supply temperature of the heating medium station changes (such as the failure of the heating medium station, the fuel changes, and the primary heating medium flow changes), it will lead to untimely control and deviation. Large, so it cannot guarantee that the temperature in the spinning process is in the required range

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