It is used to transfer heat from exhaust gas to air or other gases through heat pipe. The exhaust gas goes to the
bottom channel, and the fresh air goes the upper channel, and the two are countercurrent. If there is much dust in
the exhaust gas, soot blower can be equipped.
Application:
absorbing waste heat from high temperature waste gas, heat combustion supporting air, and heat other gas media
such as gas and natural gas.
Equipment advantage:
there are fins on both sides, and the middle is separated by steel plate, so it is not allowed to leak; the waste gas
exchanges heat outside the pipe, which is conducive to ash removal; because each heat pipe is an independent heat
transfer element and allows free expansion; through the design, the wall temperature can be adjusted to avoid dew
point corrosion.
Structural type:
there are two common structural types. In the vertical position type, the exhaust gas and air flow horizontally in
reverse direction; in the inclined type, the high temperature exhaust gas and air flow vertically or left and right up and
down.
Economic benefit analysis:
the 2500m3 blast furnace of the steel plant is equipped with three swirl top burning hot blast stoves. The blast furnace
gas is used as fuel, and the single air preheating technology is adopted. The maximum exhaust gas temperature is
400, the air preheating temperature is 170 , the exhaust gas emission temperature is 220 , and the exhaust gas
emission volume is 27 x 104 m3 / h. Adding nano fluid between air preheater and chimney , medium temperature
gas-gas heat pipe heat exchanger, The temperature of blast furnace flue gas is reduced from 220 to 150 , the heat
recovery is 22793400k] / h, and the heat exchange power is 6331 kw
According to the different exhaust gas temperature, the energy saving rate of the equipment ranges from 4% to 18%,
the investment return period is 4-12 months, and the service life is more than 8 years.
Gas-steam heat pipe heat exchanger is also called heat pipe waste heat
boiler. It is mainly composed of three parts: heat pipe, steam drum and
exhaust gas box. The heat pipe absorbs heat from the exhaust gas and
transfers the heat to the water in the steam drum through the medium to
heat the water and vaporize it. It is suitable for use in places with large
heat of exhaust gas, producing low-pressure saturated steam.
Application:
waste heat recovery of the high-temperature exhaust gas from steel
plants, petrochemical plants and industrial kilns. The generated steam can
be incorporated into the steam pipe network (needs to reach the pressure
of the pipe network), or it can be used for power generation (large steam
volume and stable heat source) or other purposes.
Equipament adventages:
Each heat pipe is an independent heat transfer unit, according to different
exhaust gas temperature levels to design heat pipes of different
temperature sections, so that the overall heat exchange temperature is
relatively balanced, and the equipment deformation can be avoided by
local overheating. The heat pipe completely isolates the heat source and
the cold source, so that it will not come into being the mixing of hot and
cold fluid; For the flue gas side, it is the heat exchange outside the tube
that easy to remove the ash, and can be equipped with an automatic soot
blower.
Strucuture:
There are two types of structure, seeing Figure A and Figure B. Figure A is the
direct boiling type in the steam drum , namely, the cooling section of the heat
pipe directly extends into the steam drum, to boil the water in the steam drum;
Figure B is the boiling type in the sleeve, to wit, the cooling section of the heat
pipe is surrounded by a water sleeve to boil the water in the sleeve which is in
a flowing state, and the generated steam is then fed into the steam dmm.
Economic benefit:
Take the power generation with waste heat project supporting the construction
of a 5500t/d cement clinker production line in a certain area as an example. A
kiln head heat pipe waste heat boiler recovers 280000m3/h waste heat of the
kiln head cooier (converted to standard conditions) with a temperature of 385. The
exhaust temperature of flue gas drops to 190, a kiln tail heat pipe waste heat
boiler recovers 330,000 m3/h (converted to standard conditions) of waste heat
with temperlure 330, the flue gas exhaust temperature drops to 210.
Considering the heat exchange efficiency and the power generation efficiency
of the power generation station with waste heat, the installed capacity is
10,000kW, and according to the annual operating time of 7200h to calculate
the power generation, the annual power generation can be 72 million KW.h so
that the supporting waste heat power generation project can save 20,088 tons
of standard coal each year, and reduces 50,000 tons C02 emissions. From
the perspective of economic benefits, for a pure low-temperature waste heat
power generation system with an installed capacity of 10,000 kW, the
construction perio is one year, and the total project investment is 71 million
yuan, of which static investment is 67 million yuan. Its annual power supply is
66.96 million KW.h, and the unit price of power supply is calculated at 0.65
yuan/kW.h including tax, so this propject can save 43.524 million yuan in
electricity bills in one year.
The payback period of equipment investment is generally 10-18 months, and
the service life is more than 10 years.
Our company produces various heat pipe heat radiators and other
radiators, and can also develop and customize various large-scale
industrial radiators according to user needs.