, overview
The automatic water hardness monitoring system is an automatic control system that has been gradually developed and improved in production practice, which is composed of three parts: the upper computer system, the hardness testing and the control system. On the testomat2000, two measurement points can be monitored, and at the same time detect whether the soft water in and out of the boiler before and after the standard, when the hardness exceeds the standard, the instrument will send a control signal, close the valve or pump to the soft water, and start the soft water controller at the same time to realize the recycling of soft water, the regeneration process of the softening device is realized by the soft water controller, with real-time monitoring, detection and other functions. Through the stable operation of the system, the workload of the personnel on duty is reduced, and the unit consumption of water treatment is reduced, and the economic benefits are obvious.
, system composition
, control principle
Boiler inlet water pre-treatment:The raw water first enters the system through the water inlet valve, the sampling pretreatment unit collects the water sample to the sample water cup after filtration, the water sample overflowing in the sample water cup flows back into the pipeline, the hardness analyzer extracts a small amount of water sample from the sample water cup for analysis and testing, the analog signal of the analysis result is transmitted to the PLC controller, and the PLC controller judges according to the analysis results, when it is higher than the hardness set value, open the soft water processor and 1 return valve and close the water inlet valve;Keep the inlet valve open and turn off the water softener when the hardness is below the set value.
Boiler effluent circulation treatment:After the boiler water is discharged, the sampling pretreatment unit collects the water sample to the sample water cup after filtration, and the water sample overflowing in the sample water cup flows back into the pipeline, and the hardness analyzer extracts a small amount of water sample from the sample water cup for analysis and testing, and the analog signal of the analysis result is transmitted to the PLC controller, and the PLC controller judges according to the analysis results, and when it is higher than the hardness set value, the soft water processor and 3 return valves are openedWhen the hardness is lower than the set value, open the 2 return valve, and the boiler effluent is recycled. When used for a long time, the outlet valve can be opened and discharged into the waste pipe.
General Control Room:It can view the hardness value of soft water in real time and modify the hardness setting value, monitor in real time, grasp the hardness of soft water in real time, reduce the workload of manual sampling and analysis, reduce the damage to the boiler and the cleaning cost, and realize the recycling of boiler water.
, industrial boiler water quality standards
Water quality of natural circulation steam boiler and steam-water boiler
1.1. Water quality requirements for using water treatment outside the pot:
1.2. Water quality requirements for simple pot dosing treatment:
Hot water boiler water quality
2.1. Water quality requirements for using water treatment outside the pot:
2.2. Water quality requirements for simple pot dosing treatment:
Through-flow and through-flow steam boiler water quality
3.1. Water quality requirements for water treatment outside the pot (no dosing treatment in the pot):
The water quality of the water quality of the waste heat boiler should meet the requirements of the same type and parameter boiler
For boilers using softener processors, it is necessary to use the off-pot water treatment method to set the hardness value of the softened water according to the boiler type. **Hardness tester, please choose the range according to your needs: th2005 th2025 th2100 th2250
, sampling and preprocessing units
This unit includes injection valves, filters, sample cups, solenoid valves, pressure gauges, etc.
Through the control of the injection valve (if the electromagnetic valve is adopted), the sampling mode can be switched continuously or intermittently, and the water intake is designed according to the actual demand of 3 4 times. Normally, in order to monitor the sample water in the pipeline in real time, the injection valve is kept open, and the sample is always injected into the sample cup of the hardness analyzer, and the excess water sample is discharged into the sewer pipe through the overflow port of the sample cup, so the injection valve is a manual valve.
The instrument injection line uses chemically inert Teflon tubing, which will not interfere with the sample water composition, and is not easy to corrode and age, and is durable. A regulating valve and a pressure gauge are installed in the injection pipeline to adjust the outlet pressure and flow rate.
The sample water cup adopts the structure of left and right intervals, and the filter screen is set in the middle, and the instrument takes samples from the side away from the inlet to prevent large particles from entering the instrument and causing damage to the instrument.
, instrumental analysis unit
1) Testomat2000 hardness** monitor.
Instrument Description: The Testomat 2000 can determine the total hardness in water, and the measurement results are displayed by LCD and expressed in °DH, ppm CaCO3, MMOL L, etc. It is especially suitable for water softening monitoring, reverse osmosis system, filtration and mineral removal process control, and is widely used in pharmaceutical, steel, semiconductor and other industries.
Since 1958, HEYL has been a reliable company in the field of pure water, and HEYL products have been used in measuring and controlling analytical instruments*. The very high quality provides a high degree of stability and guarantees the user good results in process and result control. Thanks to a largely identical technology, modular instrument types are always available for demineralized water, RO, filtration and demineralization.
The testomat2000 has 4 20mA analogue current outputs and 2 sets of control relay outputs. According to the actual needs, different measurement cycles can be selected, such as setting intervals, water volume control or external signal control to achieve a reasonable measurement method and achieve the monitoring control function.
Technical features: LCD text display running menu and user interface.
It can be expressed in units such as °DH, ppm CaCO3, and MMOL L.
Precise piston dosing pump for reagent titration.
With minimal reagent and water consumption, 30 μl per drop, approximately 3 to 5 drops of reagent is required per measurement cycle.
The reagent replacement cycle is 6 months, and the maintenance is minimal.
2 adjustable limit values, programmable alarm function.
Two measurement points can be monitored.
Programmable patches (e.g. water softener control, analysis information).
All parts that come into contact with liquids are made of corrosion-resistant materials.
Technical Parameters:, central administrative unit
The data from the testomat 2000 hardness monitor can be integrated into the plant's existing control room management software platform.
The operator does not have to go to the scene, the operation of the softener and the hardness value of the water in the output pipeline can be observed in the general control room, and the working state of the softener can be set, so as to greatly reduce the work intensity of the personnel. The testomat2000 hardness monitor controls the work of sampling and shut-off valve group through the connection with the controller of the softener, and samples the hardness value of the water in the output pipeline detected by the testomat2000 in real time, and uploads the hardness value and the working condition of the softener to the general control room for centralized display.