Ammonification anthropomorphic inspection type intelligent control system for condensed water in once-through boiler and control method

Abstract

The invention discloses an ammonification anthropomorphic inspection type intelligent control system for condensed water in a once-through boiler and a control method. The intelligent control system comprises a flowmeter for acquiring real-time flow Q of a condensed water pump, a first conductivity meter, a second conductivity meter, a third conductivity meter, a DCS controller, and an alternating-current frequency converter which is connected with the DCS controller and a dosing metering pump respectively and is used for receiving a rotating speed frequency signal sent by the DCS controller and adjusting the frequency of the rotating speed of a motor of the dosing metering pump. The ammonification anthropomorphic inspection type intelligent control system for the condensed water in the once-through boiler avoids the hysteretic nature and the non-timeliness which are caused by manual adjustment, saves lots of labor cost and realizes stable and precise control over the pH value of the condensed water in the once-through boiler.

Description

Technical field [0001] The invention belongs to the field of condensate treatment, and specifically relates to the pH value control of the condensed water of a once-through boiler, and particularly relates to a anthropomorphic inspection type intelligent control system and a control method for the condensed water and ammonia of the once-through boiler. Background technique [0002] With the improvement of thermal power plant parameters and capacity, as well as the application of once-through boilers, higher and higher requirements are put forward for the quality of boiler feed water. Once-through boiler units are equipped with condensate treatment devices to remove metal corrosion products in the condensate And a small amount of dissolved salt, so that the quality of the condensed water meets the requirements of boiler feed water. Since the entire thermal system is mainly made of steel, although various systems have adopted a variety of anti-corrosion measures, slight corrosion i...

AI Technical Summary

Problems solved by technology

However, manual adjustment of the pH value is greatly affected by human factors and the operation is labor-intensive. Untimely debugging or improper operation will easily cause the pH value to deviate from the control range, and it is difficult to achieve accurate and stable control. The control method of PID adjustment is affected by P, The I parameter setting has a great influence, and the hysteresis of pH change needs to be fully considered. The staff are often not familiar with the process, and it is difficult to consider this problem. From the perspective of the use of some power plants, due to the existence of the hysteresis of pH change, it is difficult to use PID control is also prone to large fluctuations in pH value, which will affect the quality of boiler water, directly cause corrosion of water circulation system and boiler water vapor equipment, and even cause damage in severe cases

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