Is it necessary to install waste heat recovery in boilers?
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Our company has 3 biomass hot oil boilers with a capacity of 1.4 million kcal, 2 boilers with a capacity of 1.6 million kcal, and 2 boilers with a capacity of 800,000 kcal. Currently, the management wants to utilize waste heat for heating water. I would appreciate it if the experts could advise me on whether this is necessary. The exhaust temperature of the boiler is currently around 200°C.
It’s still necessary to boil some hot water! I originally planned to use it as a workshop, but I found that this temperature isn’t suitable for that purpose; it needs to be used in combination with high pressure. So now it’s basically used only for heating water for bathing!
Our workshop may need hot water cleaning equipment that operates at 80–100°C. Can the water recovered be brought to this temperature? The water temperature in the heat recovery system of the air compressors I built before was at most 70°C
The smoke exhaust temperature of yours does not meet the **standards; it is recommended to increase the heating surface at the rear
A economizer can be added to lower the flue gas temperature, increase the boiler feedwater temperature, and boost steam production. Or add a heat pipe air preheater to preheat the temperature of the air entering the furnace.
How much can a heat pipe air preheater improve thermal efficiency?
Also, since our boiler uses biomass fuel, will dust accumulate in the air preheater?
Thermal power generation! Higher utilization!
To obtain steam, add a economizer. Air heat exchangers are relatively large in size; there is no need for maintenance on a regular basis. Ash accumulation occurs inside the tubes due to the flow of flue gas, and cleaning is required once a year. Each option has its advantages and disadvantages – it depends on your choice
The flue gas temperature is a bit high; increasing the heat recovery from the rear heating surfaces significantly improves the efficiency of heating water.
The heat pipes in heat-tube air preheaters should not have fins; it is important to use a large pitch for the tube bundles, with the tubes arranged in rows, as otherwise dust accumulation is likely to occur.