Hollysys DCS control scheme for water treatment

Hollysys water treatment DCS control scheme

I. user requirements and control objectives

(1) increase water treatment equipment to meet the demand for softened water after the expansion of turbine and boiler

(2) adopt DCS control system for centralized control of new and original water treatment equipment to realize automation and program control of water treatment production

realize the automation and program-controlled control of on-site water treatment equipment, and realize the remote monitoring, interlocking protection and fault alarm of on-site instruments and equipment through the dynamic man-machine interface

II. Control scheme

dcs control system is designed to measure 840 points in total (including standby points)

dcs system configuration is as follows:

operator station: 2 sets

i/o cabinet: 3

solenoid valve box: 10 sets

dcs system configuration is divided into two i/o stations, one of which is equipped with an expansion cabinet

III. functions

one station completes the monitoring and program control of new water treatment equipment

1. Automatic operation and regeneration process of three high-efficiency fiber filters

2. Automatic control of motors and solenoid valves of demineralized water system, 4anion bed, 4cation bed, 1p-3mixed bed

3. Monitoring, alarm, control and interlock protection of analytical instruments, conventional instruments, conventional pumps and solenoid valves of new equipment

4 Fault diagnosis and alarm of all electric pumps and solenoid valves of new equipment

1 station completes the monitoring and program control of the original water treatment equipment

1, 1p33s automatic control of the motors and solenoid valves of the anion and cation beds

2, the automatic control of the motors and solenoid valves of the desalted water system, clean water tank and other equipment

3, the analytical instruments, conventional instruments, electric pumps and solenoid valves of the original equipment reach 12% Valve monitoring, alarm, control and interlock protection

4. Fault diagnosis and alarm of all electric pumps and solenoid valves of the original equipment

i/o station expansion cabinet completes the monitoring and control of hydrogen production equipment

1, and the automatic start and stop control of hydrogen production device

2 there are three main reasons why the new material is large but not strong: 1. The support ability is weak, and the start and stop actions of the electric pump and solenoid valve of the hydrogen production device

3. Value of analog quantity and switching quantity, condition monitoring and fault alarm

IV. features

1. The special operation screen and flow chart monitoring screen are very flexible and convenient, meeting all the requirements of process operation

2. The DCS water treatment program control designed in this scheme adopts st language. The operation picture is very distinctive. The software scheme is novel, practical, reliable, convenient and intuitive. It can be put into use at the initial stage of start-up

v. after the application of

Maoming water treatment DCS control system was put into operation, it operated well and the operators were very satisfied, which was praised and thanked by the user leaders

the operation of this scheme not only provides a reliable guarantee for the normal production of Maoming Thermal Power Plant if the instrument CPU (generally 89C52) i/0 does not output, but also creates considerable economic benefits, and opens a new chapter for the automation of production control of Maoming Thermal Power Plant