Control method for frequency conversion regulation of causticizing green liquor system

A control method and causticizing green liquor technology, applied in the field of frequency conversion regulation, can solve problems such as difficult control of the liquid level of the green liquor tank, easy fouling of the green liquor transportation pipeline, and difficulty in adjusting the opening of the valve, so as to achieve high energy saving and high adjustment speed Sensitive, large starting torque effect

CN111424454AInactive Publication Date: 2020-07-17FUJIAN QINGSHAN PAPER INDUSTRY CO LTD
2 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-07-17
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
Patent Text Reader

Abstract

The invention discloses a control method for frequency conversion regulation of a causticizing green liquor system. Frequency conversion of the causticizing green liquor system is modified, stepless speed regulation of a frequency converter is used for replacing an electric valve control mode of an original green liquor system, and the technical problems that the opening degree of a valve is difficult to adjust, errors are large, precision is low, a green liquor conveying pipeline is prone to scaling, and the liquid level of a green liquor tank is difficult to control are solved.
Need to check novelty before this filing date? Find Prior Art

Description

Technical field

[0001] The invention relates to the technical field of frequency conversion regulation, in particular to a control method for frequency conversion regulation of a causticizing green liquor system.

Background technique

[0002] The causticizing green liquor transportation system is an important part of the alkali recovery plant. The green liquor from #1 and 2 alkali furnaces is sent to the green liquor tank, and then the causticizing green liquor is pumped to the digester and reacts with quicklime to form primary white liquor for use in the pulp mill. . The main components of green liquor are sodium carbonate and sodium sulfide, which have the characteristics of high concentration and high viscosity. The transportation pipeline is easy to scale, and the formation of scale is closely related to the transportation speed of green liquor.

[0003] The design capacity of the original green liquid system is: flow rate 60~120m 3 / h, the electric adjustment valv...

Examples

Embodiment Construction

[0033] In order to facilitate a better understanding of the present invention, the following examples are used to illustrate, and these examples belong to the protection scope of the present invention, but do not limit the protection scope of the present invention.

[0034] Such as figure 1 As shown, a control method for frequency conversion regulation of causticizing green liquor system includes the following steps:

[0035] (1) Centralized control: remote control by the console;

[0036] (2) Machine side control: start and stop the motor on the motor field control box;

[0037] (3) The frequency conversion cabinet can input and output the following signals:

[0038] 1) Input signal of switching value of frequency conversion cabinet: drive by frequency converter, that is, passive contact, start when closed, stop when open;

[0039] 2) Frequency conversion cabinet speed given signal: 4~20mADC, speed given signal;

[0040] 3) The frequency conversion cabinet should at least...