How to make adjustments if the steam parameters are not up to standard?
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For the demineralized water used in 3.8MPa boilers, all parameters are within acceptable limits except for hardness; the sodium ion level in the steam is 200-400 units above the standard, and the oxygen content is also above the specified limit. The temperature of the thermal deaerator is 104 degrees, while the pressure is 0.2. I’m not sure what the cause of this is. I would appreciate advice from those with more experience in this field. Thank you
For 3.82 MPa medium-pressure steam quality, only two parameters are controlled: sodium and silica. Is the silica level within acceptable limits? If silica is within acceptable limits but sodium is not, it is related to the trisodium phosphate added that ends up in the steam. This indicates two problems: first, the efficiency of steam-water separation is poor, and second, the level of phosphates is too high. Reasons for poor steam-water separation include high water level control, damaged steam-water separation equipment, and overloading of the drum. The phosphate level can be kept slightly lower; as long as the pH value is within an acceptable range, trying to keep it around 5 mg/L to see the effects. Unqualified hardness? By how much is the hardness too high? The requirement for medium-pressure systems is less than 2 micromoles per liter. How is the pH level of the boiler water controlled? Please continue the discussion; it will surely solve your problem.
Since the hardness level in the desalinated water is not up to standard, it is recommended to undergo an additional stage of mixed-bed treatment; the analysis shown above indicating excessive sodium ions is correct
The hardness is 5 micromoles/liter too high.
In my opinion, as long as the parameters of the boiler water are within the acceptable range, the steam produced should also meet the required standards. I suggest that you check whether the parameters of the boiler water are satisfactory, and then increase the amount of waste water discharged for a while to see the effects! !
The oxygen content is not within the specified range; check whether the exhaust valve of the deaerator is set too low
1. First, the idea is to address the issue of unsatisfactory hardness in the desalinated water; this should be simple and easy to handle. 2. Carefully analyze and compare whether the dissolved oxygen level in the feed water is within acceptable limits; if not, the deaerator should be inspected. 3. Test whether the various indicators of trisodium phosphate content meet the standards. 4. Reasonably adjust the operational stability of the boiler and strictly follow the operating procedures. 5 Discharge pollutants in a rational and scientific manner
For thermal deoxidation, the reboiler valve can be opened to heat the water in the deoxidizer, thereby reducing its oxygen content. Check whether the water level is kept too high, resulting in poor separation of steam and water. Test the boiler water for phosphate and salt content; excessive levels can lead to foaming in the steam. Also, proofread the sodium ion meter