The boiler water temperature in the waste heat boiler is severely above the limit
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This post was last edited by Mingge on 2016-9-30 08:34. Our plant currently has an 18T waste heat boiler, and the quality of the boiler water was normal before maintenance. Since the maintenance work began, the highest hardness of the boiler water reached 1000 micromoles per liter, the pH level was around 9, the chloride content was around 133, and the conductivity was around 146. After discovery, the following checks were carried out: the pure water was qualified, the power plant return water was qualified, the deaerator was qualified, and the inlet of the boiler feed pump was qualified. The inspection revealed no external water sources or water with high hardness entering the boiler. At present, we have increased the frequency of boiler water replacement; after the hardness of the boiler water decreased, it started to rise again repeatedly. We sent the boiler water for testing; the iron level was 0.179 milligrams per liter, calcium at 3.571 milligrams per liter, and magnesium at 0.722 milligrams per liter. I urgently need the help of my brothers to solve this. What causes the boiler water level to exceed the limit? Treatment results and methods: The water hardness in the 18T waste heat boiler has now been reduced to a satisfactory level. We used a dosing tank with a diameter of one meter to add trisodium phosphate into the waste heat boiler; a total of 12 centimeters of trisodium phosphate was added to the 18T waste heat boiler. Before adding the chemical, the hardness was measured at 100 micromoles, while after addition it was 1 micromole, which meets the required standards. Similarly, last night, before adding chemicals to the water in the 11T waste heat boiler, the hardness level was 120 micromoles; after adding 6 cm of chemicals, a sample was taken and the hardness level of the boiler water dropped to 1 micromole, which is within the acceptable range. Does the hardness drop so quickly when trisodium phosphate is added? Is there a reason?
The boiler can be put into use only after it has passed the flushing test following maintenance. Was chemicals added during operation?
The possibility of a leak is low; we have checked the water source for the boiler. Sampling at the inlet of the feed water pump also showed satisfactory results. Currently, the samples taken from the boiler’s sampling pipe show excessive levels.
The method for starting up the furnace after maintenance each year remains the same as the method used after this year’s maintenance. If the pH value exceeds 9 during operation, no chemicals are added. If we add a chemical, it is trisodium phosphate.
It’s the same as that post I replied to a couple of days ago – the pipes used for construction contain soil, which settles in the corners and occasionally causes problems. If the construction contract includes a clause for deducting the quality guarantee fund in such cases, and if supervision is carried out alongside each pipe during construction, as well as ensuring that non-professional teams are not used, this issue can be avoided.
Increase wastewater discharge (fixed or continuous discharge), and add chemicals (sodium triphosphate) based on the water quality analysis results.
What type of waste heat boiler does the original poster have? The waste heat boiler behind the gas turbine? Was there any cleaning or purging done after the maintenance? Which manufacturer makes the waste heat boiler? What material are the various heating surfaces made of?
What type of waste heat boiler does the original poster have? The waste heat boiler behind the gas turbine? Was there any cleaning or purging done after the maintenance? Which manufacturer makes the waste heat boiler? What material are the various heating surfaces made of?
Those used in copper smelting could be considered environmentally friendly and recyclable. The steam for our turbines is supplied by waste heat boilers. What do you mean by cleaning and purging? The manufacturer is Anhui Jinding Boilers. The material is basically 20G
Those used in copper smelting could be considered environmentally friendly and recyclable. The steam for our turbines is supplied by waste heat boilers. What do you mean by cleaning and purging? The manufacturer is Anhui Jinding Boilers. The material is basically 20G