Water usage issue for the burner protection pump
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The water used to protect the burners in our conversion furnace is deionized water, at a temperature of around 20 degrees. Water from the upper pipe of the deionized water preheater is pumped into the burners and then returns to that same upper pipe. We would like to make a change: instead of using a pump, we want to use boiler feed water to supply the burners. What do you think? Do you have any suggestions for this modification? Thank you
Modify the pipeline by installing an intermediate storage tank between the boiler feed water; its location should be high enough to ensure the required pressure for supplying water to the burners.
What is the temperature of the boiler feed water? Will the temperature be too high?
Requirements for water used in burners: Desalinated water meets the requirements; can boiler feedwater be used as well?
Our boiler feed water temperature is around 90 degrees. What is an appropriate temperature for the return water? We would appreciate advice from experts
I believe the key to this issue is whether the boiler feed water meets the requirements of demineralized water, and another key factor is whether the pressure of the boiler feed water is sufficient to meet the pressure requirements of the pump feeding the burners; in other words, whether the boiler feed water can be supplied to the burners smoothly. If both of these conditions can be met, it’s a good idea. Energy saving, reduced equipment needs.
Actually, making the change is very simple: just open a hole at a convenient location for supplying water to the boiler and another hole at a convenient location for protecting the burners, and add a valve to each of them. The return water can be sent directly through the original pipeline back to the desalinated water supply, without any changes needed. There is also a pressure difference between the two: 3.8 MPA for the supply water and 0.8 MPA for the return water. Based on the actual situation: it is necessary to consider whether the flow rate of the boiler feed water pump, after passing through the burner, affects subsequent production, and whether a large pressure difference between the two affects the flow rate of water supplied to the desalination system. The modified burner protection pump can be used as a backup.
Boiler feed water generally comes after the desalinated water preheater, so its temperature is high. Is it a bit too high if this water enters the water jacket of the converter at a temperature of 90 degrees?
Using a pump can increase the water flow rate. Without a pump, the water flow rate is naturally lower; I’m not sure if this is sufficient to meet the protection requirements ； Furthermore, if the flow rate of the deionized water is low, it is prone to vaporization; without deoxidation, this may cause damage to the pipes. If deoxidation is not performed, it is recommended not to make any changes. If deoxygenation has been carried out, it is recommended to connect the desalinated water supply pipeline directly to the protection pipeline, and after that, connect it directly to the desalinated water after preheating.
However, this pump is very small; its flow rate is around 10 cubic meters, and its power does not exceed 5 kilowatts (we operate on a scale of 200,000 tons). What’s the point of making changes? And the sump also needs to be pumped up.
In fact, nitrogen can be used to pressurize the water, so that the deionized water can enter the burner
It’s complete nonsense! The flow rate in the desalinated water pipeline for boiler feedwater can be quite high due to pressure differences; as a result, it is necessary to increase the flow rate of the boiler feedwater pump. In an effort to save on the costs associated with using two burner protection pumps, introducing return water into the desalinated water stream affects the amount of desalinated water that can flow through it, which in turn reduces the heat exchange efficiency of the desalinated water preheater! From a pros and cons perspective! It’s not worth it at all!
Should the boiler feedwater and desalination water pumps have their pressure increased based on the current setup? It’s possible to do so if the power capacity permits; otherwise, high-power pumps will need to be installed again! Please give me some advice!
Clarify the purpose of designing the burner protection pump before making changes!
I have been at Hebei Tianlu, Inner Mongolia Qinghua, Shanxi Tianhao, as well as my current workplace – all of these were designed by the Second Institute. Deionized water is used for the burners; its temperature is around 20 degrees, and the temperature of the water exiting the burners is below 50 degrees, which meets the requirements for those burners. I’ve also thought about how to change the process, but after much consideration I couldn’t figure it out. The design is based on certain principles; if deoxygenated water is used, there will be many more problems. Think about it carefully
Both the pressure and flow rate of the boiler feed water are satisfactory, but the temperature is too high; firstly, heat exchange is poor, secondly, vaporization occurs easily, and thirdly, it is difficult to operate. Therefore, not only process conditions but also the capacity of the equipment must be taken into account.
It is important to replace the return flow meter for the burner protection water, due to the high-temperature resistance issues of the original design! ! Changing it to orifice plate flow meters would cost around 18,000 yuan, and with other valves and such, the total cost would be around 19,000 yuan! ! ! The shipping cost isn’t very high!
It’s better not to make any changes. Ours has an additional desalination tank to ensure there is water available in case of a power outage