There are a large amount of high-temperature exhaust gas emissiorendustrial
boilers, kilns, smelting furnaces, petrochemical, coal dTemical and other
industries, which not only causes waste of heat, but also pollutes the
environment. The heat pipe waste heat recovery device can be used to recover
the heat in the exhaust gas. The recovered heat can be used as boiler
sipplement water and domestic water according to need, or the heated air can
be used as combustion air or drying materials. It can save fuel costs, reduce
production costs, reduce exhaust emissions, and it is also energy-saving and
environmental friendly.
The gas-liquid heat pipe heat exchanger is used to transfer the heat in the
exhaust gas to the water through the heat pipe. The exhaust gas gees through
the lower channel, and the water goes through the upper water tank. There is a
baffle in the water tank, and the two flow in a countercurrent direction. If there is
a lot of dust in the exhaust gas, a soot blower can be equipped, if it is not
deionized water, an anti-scale device can be equipped.
Application:
It absorbs heat from high-temperature exhaust gas to heat the feed water. The
heated water can be returned to the boiler (as an economizer) or used alone (as
a water heater), thereby improving energy utilization and achieving energy
saving.
Equipment advantages:
The exhaust gas side is a finned tube, and the water side is a smooth tube,
which has high heat transfer efficiency; through reasonable design, the wall
temperature can be increased and dew point corrosion can be avoided; it can
effectively prevent the mixing of hot and gcA6 fluids caused by damage to the
tube wall.
Structure:
According to the different heating methods on the water side, there are two
commonly used stmetures: integral water tank heating (mostly using heat pipes
placed vertically) and water jacket convection heating (mostly using heat pipes
tilted).
Economic benefit analysis:
Take a company’s 20t/h boiler as an example. The heat exchanger Is equipped
with an automatic ash remover. The average flue gas inlet temperature is 155,
and the outlet temperature averages 125. The actual flue gas flow rate is
calculated at 45000Nm3/h. The heat recovery hour is 370,675 kilocalories (kcal),
which is equivalent to 74 kilograms of 5000kc5al coal. It is only calculated
according to the boiler thermal efficiency of 100%. The actual thermal efficiency
of the compan/s boiler is about 72%. Therefore, the actual coal saving per hour
should be 74r0.72=102 kg.
Depending on the temperature of the exhaust gas, the energy-saving rate of the
equipment ranges from 5%-20%, the payback period is 3-10 months, and the
service life is more than 6 years.