Circular cooler flue gas waste heat recovery and optimization method
A flue gas waste heat and optimization method technology, applied in the field of iron and steel smelting, can solve problems such as flue gas heat loss, achieve the effect of improving recovery rate and avoiding emissions
Inactive Publication Date: 2011-02-23
BEIJING CENTURY BENEFITS
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Problems solved by technology
However, since the trolley of the annular cooling machine is moving, and the flue gas annular cooling cover above is fixed, there will inevitably be a gap between the cooling cover and the trolley of the annular cooling machine, which causes each pumping While inhaling hot flue gas near the air port, a large amount of external cold air is also sucked in, while the hot flue gas between the air inlets is released along the gap, resulting in a waste of heat loss in this part of the flue gas
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[0020] Such as Figure 1 to Figure 3 As shown, the optimized method for recovering waste heat of flue gas from a ring cooler of the present invention is used to recover the waste heat of flue gas from a sintering ring cooler, which specifically includes:
[0021] 1) Open one or several exhaust ports on the top of the ring cooling hood as hot flue gas exhaust flue;
[0022] 2) A flue gas baffle is arranged horizontally along the axial direction of the ring cooler inside the ring cooling cover;
[0023] 3) A diversion channel with a set width is opened in the middle of the flue gas deflector along the center line of the annular cooler;
[0024] 4) Use the formula: ψ 0 (x)=f(d x , W x , D, h), calculate the width of the diversion channel, where d x Is the channel width at x, w x Is the mass flow of flue gas at x, D is the width of the circulating cooler trolley, h is the height of the flue gas deflector from the upper edge of the trolley, ψ 0 (x) is the envelope line with the centerline ...
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The invention discloses a circular cooler flue gas waste heat recovery and optimization method, which comprises the following steps of: 1) forming one or more of extraction openings on the top of a circular cooling cover serving as a thermal flue gas extraction flue; 2) horizontally arranging a flue gas guide plate inside the circular cooling cover along the axial direction of a circular cooler, wherein the distance from the guide plate to an upper edge of a circular cooler trolley is at least 500mm; 3) forming a guide passage with a certain width on the flue gas guide plate along a centre line of the circular cooler; and 4) taking the centre line of the circular cooler as an x axis, making the flue gas speed in axially symmetrical distribution on a cross section of the x axis, making each group of equal-speed lines form an envelope curve, gradually reducing the speed from the center to the inside and outside of the circular cooler so as to form a series of envelope curves of which the speeds are gradually reduced, finally forming a zero-speed envelope curve phi0(x), and obtaining the width of the passage through back calculation. The circular cooler flue gas waste heat recovery and optimization method can uniformly absorb the thermal flue gas of the circular cooler to the greatest degree, avoids the emission of partial thermal flue gas and improves the recovery rate of the flue gas waste heat.
Description
Technical field [0001] The invention relates to the field of iron and steel smelting, in particular to an optimization method for the recovery of waste heat from flue gas of a ring cooler. Background technique [0002] In the iron and steel smelting industry, most of the waste heat of sintering flue gas (including waste heat of sintering machine exhaust gas and ring cooler flue gas) is currently radiated through the chimney, which has not been rationally utilized, and a large amount of heat source is wasted. In recent years, more and more attention has been paid to how to use this part of waste heat. Some steel plants have begun to recycle waste heat from sintering to generate electricity. Among them, the flue gas in the front section of the ring cooler has a relatively high temperature (up to 350°C), and The fly ash content is low and has a high recycling value. [0003] Due to the longer length of the ring cooler, and from the sinter discharge port (starting end) to the discharg...
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IPC IPC(8): F27D15/02F27D17/00
CPCY02P10/25Y02P80/15
Inventor 余立新
Owner BEIJING CENTURY BENEFITS