Temperature control method of ammonia water recovery stripper

Abstract

The invention discloses a temperature control method of an ammonia water recovery stripper. According to the method, firstly, a target value, namely, the bottom temperature of the stripper is set to be 96-105 DEG C, 1% is added to the set target value SV and steam valve opening MV automatically when the target valve is lower than a lower limit, 1% is subtracted from the set target value SV and the steam valve opening MV automatically when the target valve is higher than an upper limit, then the set target value of the bottom temperature is compared with an actual measured value of the bottom temperature, a PID data model is built on the basis of the conventional PID data model through calculus and optimized according to error selection between actual output and input, the steam valve opening is regulated automatically with the modified PID data model, the steam flow is regulated, and automatic control of the stripper temperature is realized. With adoption of the method, the labor intensity of a worker can be reduced, process parameters of the stripper as ammonia water recovery equipment are more stable, the treatment efficiency of the equipment is increased greatly, and the whole running cost of the equipment is reduced.

Description

technical field [0001] The invention relates to a stripper temperature control method, in particular to a stripper temperature control method for ammonia water recovery. Background technique [0002] With the rapid development of industrialization, the amount of industrial wastewater is increasing day by day, especially the industrial wastewater containing ammonia nitrogen must be deammonized to meet the standard before it can be discharged to the outside world, and ammonia water is an important chemical raw material, which is generally recycled. The recovery methods of ammonia water mainly include distillation, steam stripping and so on. The recovery of ammonia water by stripping is carried out by using a stripping tower, and the efficiency of ammonia water recovery is directly related to the temperature of the stripping tower, especially closely related to the temperature at the bottom of the stripping tower. At present, the temperature control at the bottom of the stripp...

AI Technical Summary

Problems solved by technology

At present, the temperature control at the bottom of the stripping tower is controlled manually according to the comparison error between the set value of the stripping tower bottom temperature and the actual measured temperature at the bottom of the tower to control the temperature setting value of the bottom of the tower. When the comprehensive technical level of the operator is not high , Misjudgment and operation errors or inattention, failure to adjust the set value of the bottom temperature in time will reduce the efficiency of equipment recycling and increase the overall operating cost of the equipment, and when external conditions change frequently, employees need to adjust the steam in time The valve opening is used to adjust the flow of steam to control the temperature of the stripper, which will increase the labor intensity