CN217127457U - Blast furnace slag water quenching and flue gas treatment tower system - Google Patents
Blast furnace slag water quenching and flue gas treatment tower system Download PDFInfo
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- CN217127457U CN217127457U CN202220545183.5U CN202220545183U CN217127457U CN 217127457 U CN217127457 U CN 217127457U CN 202220545183 U CN202220545183 U CN 202220545183U CN 217127457 U CN217127457 U CN 217127457U
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Abstract
The utility model discloses a blast furnace slag water quenching and flue gas treatment tower system, which relates to the technical field of blast furnace slag water quenching. The flue gas produced in the granulating process is sprayed with cooling water through a cooling and atomizing device arranged in a slag water quenching granulating tower to be subjected to primary cooling treatment, then is subjected to secondary treatment through a baffle plate demisting device arranged above the cooling and atomizing device, is subjected to tertiary heating treatment through a flue gas heating device arranged above the baffle plate demisting device, and finally is subjected to quartic treatment through a flue gas standby direct-mixing heating device according to the field environment condition, so that the effect of condensing and absorbing rising water vapor in the water quenching process is achieved, the flue gas whitening effect is achieved, and the environmental pollution is effectively avoided.
Description
Technical Field
The utility model relates to a blast furnace slag shrend technical field especially relates to a blast furnace slag shrend and flue gas treatment tower system.
Background
Blast furnace slag is a solid waste formed from gangue in the ore, ash in the fuel and non-volatile components in the solvent during the blast furnace iron making process. The existing blast furnace slag treatment method is to process blast furnace slag into water granulated slag, slag crushed stone, expanded slag, slag bead and the like. The granulated slag is formed by rapidly cooling the blast furnace slag in a hot-melt state in water, a large amount of water vapor is generated when slag flushing water and the molten slag contact and exchange heat in the process, and the water vapor is discharged aloft through a chimney in a conventional slag treatment mode. The water vapor generated under normal conditions contains sulfur and has certain corrosiveness, which not only causes serious pollution to the surrounding environment but also damages the equipment, and simultaneously, the discharge of the water vapor also causes a large amount of waste of heat energy.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a blast furnace slag shrend and flue gas treatment tower system effectively avoids environmental pollution when improving the efficiency.
In order to realize the technical purpose, the utility model adopts the following scheme: the blast furnace slag water quenching and flue gas treatment tower system comprises a slag water quenching granulation tower, wherein the slag water quenching granulation tower comprises a first chamber and a second chamber, the first chamber is respectively provided with a slag chute and a slag outlet, and the top of the first chamber is separated from the second chamber by a partition plate; a cooling atomization device and a baffle plate demisting device are sequentially fixed in the second chamber from bottom to top, and a flue gas heating device is fixed at the top of the second chamber; the flue gas heating device is communicated with the first cavity through the air outlet flue, the flue gas heating device is communicated with the second cavity through the air return flue, and the bottom of the second cavity is provided with a water outlet.
Compared with the prior art, the beneficial effects of the utility model reside in that:
(1) the flue gas heating device carries out waste heat recovery on high-heat vapor after water quenching, the water-containing flue gas after waste heat recovery returns to the tower, and the flue gas temperature is reduced after waste heat recovery, so that the content of the vapor is greatly reduced, and the flue gas dehumidification effect is achieved; meanwhile, dust particles contained in the flue gas are intercepted by the atomized water drops, so that the flue gas dedusting effect is achieved, the primarily treated water-containing flue gas and the atomized water drops are cooled by the baffle plate demisting device, condensed into large water drops, converged into water flow, and then collected and discharged out of the slag water quenching granulation tower for cooling, and then enter the atomizing nozzle for recycling. The moisture flue gas and the atomized water droplet of this moment are discharged after the secondary treatment, continuously rise through the heat transfer of the tube pass of the flue gas heating device, and after the moisture flue gas is washed twice and heat transfer, the moisture flue gas reaches the emission standard of environmental protection, discharges to natural environment, and then reaches more environmental protection, eliminates the effect of white smoke.
(2) The utility model discloses utilize flue gas self heat energy to carry out reheat to the moisture flue gas after the condensation dehumidification, do not need the draught fan to inhale the flue gas that blast furnace slag granulation in-process produced to unified device and handle, greatly reduced the consumption of electric energy, heat energy in the flue gas treatment process.
(3) The energy efficiency is saved, meanwhile, the smoke generated in the granulation process is subjected to whitening treatment, the direct discharge of white smoke generated in the granulation process is avoided, and the environmental pollution and the corrosion damage of the white smoke generated in the granulation process to self equipment are reduced.
The utility model discloses an optimal scheme does:
the baffle plate demisting device comprises a spraying mechanism and a baffle plate, wherein the spraying mechanism is fixed above the baffle plate, and the baffle plate is provided with air holes. Atomized water is regularly sprayed out by a spraying mechanism arranged on the baffle plate to clean the baffle plate, so that the vent hole on the baffle plate is prevented from being blocked; meanwhile, impurities condensed from other water-containing flue gas are prevented from being adhered to the baffle plate to influence the cooling effect, and then the treated water-containing steam can smoothly pass through the air holes on the baffle plate in the baffle plate defogging device to continuously rise; the device also has the effects of cooling and washing the water-containing flue gas, and further can achieve the effect of ensuring smooth and smooth proceeding of the whitening of the flue gas, so that the whitening process is not blocked, and the whitening effect is more obvious.
And water sealing covers are respectively fixed on the inner side of the slag chute, the inner side of the slag outlet and the inner side of the water outlet. The water seal cover is immersed below the liquid level, so that the water seal isolation effect of the molten slag water quenching granulation tower and the external environment is realized, the high-temperature water-containing smoke is prevented from overflowing the molten slag water quenching granulation tower to pollute the environment in the process of slag flushing granulation, and the molten slag granulation process is more environment-friendly.
A punching box is fixed below the slag chute.
The baffle is fixed in the second cavity bottom of slope, and the delivery port is seted up in the low one side of baffle height, does benefit to the drainage.
The slag water quenching granulation tower also comprises a third chamber communicated with the outside, the third chamber is arranged above the flue gas heating device, and a negative pressure fan is fixed at the upper part of the third chamber. The negative pressure fan helps the slag water quenching granulation tower to ventilate, under the action of the negative pressure fan, the air flowing speed in the third chamber is increased, the air pressure in the third chamber is reduced and is smaller than the air pressure in the second chamber and the first chamber, the rising speed of the water-containing flue gas is higher under the action of pressure, the trend of the water-containing flue gas is ensured to be that the water-containing flue gas enters the third chamber from the first chamber through the second chamber, and the water-containing flue gas is discharged after reaching the standard through the cooling and atomizing device, the demisting baffle plate device and the flue gas heating device in the second chamber, so that the water-containing flue gas is ventilated and ventilated more smoothly, and the whitening effect is more obvious.
And a standby direct-mixing heating device for smoke is fixed at the bottom of the third chamber. The high-temperature gas in the standby direct-mixing heating device for the flue gas is waste heat air in links of a blast furnace, a hot blast furnace and the like, and is sprayed into the slag water quenching granulation tower to be mixed and heated with the flue gas generated in the granulation process, so that the temperature of the flue gas discharged by the slag water quenching granulation tower is increased, the problem of unobvious effect of eliminating the white smoke in extremely cold weather in winter is solved, no white smoke is generated even in severe weather and at lower temperature, and the more remarkable whitening effect is achieved.
Drawings
FIG. 1 is a schematic sectional structure view of a blast furnace slag water quenching and flue gas treatment tower system provided in an embodiment of the present invention;
FIG. 2 is an enlarged view taken at A in FIG. 1;
FIG. 3 is an enlarged view at B of FIG. 1;
fig. 4 is a schematic diagram of an internal structure of a third chamber according to an embodiment of the present invention;
labeled as: 1. a first chamber; 11. a slag chute; 12. punching a box; 13. a water seal cover of the slag inlet; 14. a slag hole water seal cover; 15. a slag outlet; 2. a second chamber; 21. an air outlet flue; 22. a return air flue; 23. a water outlet; 24. a water outlet water sealing cover; 3. a third chamber; 4. a flue gas heating device; 5. a baffle plate demisting device; 51. a spraying mechanism; 52. a baffle plate; 53. air holes are formed; 54. a gap; 6. cooling the atomization device; 61. a water inlet pipe; 62. an atomizing nozzle; 7. a standby direct mixing heating device; 71. heating the air pipe; 72. an air nozzle; 8. a negative pressure fan; 9. a separator.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and functions of the present invention, but the present invention is not limited thereto.
Referring to fig. 1, the utility model provides a blast furnace slag water quenching and flue gas treatment tower system, which comprises a slag water quenching granulation tower, a flue gas heating device 4, a negative pressure fan 8, a baffle plate defogging device 5, a cooling atomization device 6, etc. The slag water quenching granulation tower is a cylindrical or conical tower body, the top of the tower is of an open structure, the inner cavity of the tower is divided into three chambers, namely a first chamber 1, a second chamber 2 and a third chamber 3 from bottom to top.
A slag inlet is formed in the upper portion of the first chamber 1, a slag chute 11 is fixed to the slag inlet, a punching box 12 is fixed to the side wall of the first chamber 1 below the slag chute 11, when molten metal is granulated, the molten metal is guided into a slag water quenching and granulating tower through the slag chute 11, and the molten metal is smashed into small particles under the action of pressure water sprayed from the punching box 12. A slag inlet water sealing cover 13 is fixed on the first chamber 1 on the inner side of the slag inlet, one part of the slag inlet water sealing cover 13 is positioned in the first chamber 1, the other part of the slag inlet water sealing cover 13 extends out of the first chamber 1, the slag inlet water sealing cover 13 positioned outside the first chamber 1 covers the slag chute 11 and the punching box 12 to wrap the slag chute, the lower end of the slag inlet water sealing cover 13 positioned in the first chamber 1 is immersed into the circulating water which is accumulated below the liquid level of the circulating water at the bottom of the first chamber 1 by 200-500 mm, the slag inlet is wrapped, the water sealing isolation of the slag water quenching tower and the external environment is realized, and the situation that high-temperature flue gas overflows the slag water quenching tower to pollute the environment in the slag quenching granulation process is prevented. The water seal cover 13 of the slag inlet can be made into any shape.
The slag notch 15 has still been seted up to the first cavity 1 lateral wall of advancing the slag notch offside, and the first cavity 1 of slag notch 15 department is fixed with slag notch water seal cover 14, and 14 parts of slag notch water seal cover are located first cavity 1 inboardly, and another part stretches out to first cavity 1 outside. The upper end of a slag hole 15 is wrapped by a slag hole water sealing cover 14 positioned outside the first chamber 1, and the lower end of the slag hole water sealing cover 14 positioned in the first chamber 1 is immersed and accumulated to be 200-500 mm below the circulating water level at the bottom of the first chamber 1, so that the slag water quenching granulation tower is isolated from the external environment by water sealing, and high-temperature flue gas is prevented from overflowing the slag water quenching granulation tower to pollute the environment in the slag flushing granulation process.
The top of the first chamber 1 is fixed with a baffle 9 which is obliquely arranged, and the second chamber 2 is arranged above the baffle 9. The upper part of the first chamber 1 is connected with an air outlet flue 21, the upper end of the air outlet flue 21 is connected with a shell pass inlet of the flue gas heating device 4, and a shell pass outlet of the flue gas heating device 4 is communicated with the bottom of the second chamber 2 through an air return flue 22.
The bottom of the second chamber 2 is provided with a water outlet 23, the water outlet 23 is positioned at the lowest position of the partition plate 9, a water outlet water sealing cover 24 is fixed on the inner side of the water outlet 23, the water outlet water sealing cover 24 is positioned inside the slag water quenching granulation tower, the water outlet water sealing cover 24 covers the water outlet 23, the water outlet water sealing cover 24 is immersed below the circulating water level stored at the bottom of the partition plate 9, the slag water quenching granulation tower is isolated from the external environment by water sealing, and the situation that high-temperature water-containing flue gas overflows from the slag water quenching granulation tower to pollute the environment in the slag flushing granulation process is avoided.
Referring to fig. 3, a cooling and atomizing device 6 and a baffle plate demisting device 5 are sequentially fixed in the second chamber 2 from bottom to top, the cooling and atomizing device 6 is composed of a water inlet pipe 61 and an atomizing nozzle 62, two water inlet pipes 61 are fixed in parallel from top to bottom, a plurality of atomizing nozzles 62 are fixed on each water inlet pipe 61, the atomizing nozzles 62 are commercially available fluid atomizing nozzles, the average particle size of ejected droplets is 100-500 μm, and the inlet water temperature of the atomizing nozzles 62 is controlled at 20-60 ℃.
Referring to fig. 2, the baffle plate demisting device 5 comprises a spraying mechanism 51 and a baffle plate 52, the spraying mechanism 51 comprises a spraying pipe and nozzles, the spraying pipe is fixed above the baffle plate 52, the spraying pipe is fixed with a plurality of nozzles, and the nozzles periodically spray high-pressure atomized water downwards. The baffle 52 is a metal plate of any shape. Gaps 54 for the flow of the flue gas and the medium are reserved between the adjacent baffle plates 52. The baffle plate 52 is provided with a vent hole 53, and the high-temperature water-containing flue gas escapes from the second chamber 2 and contacts with the baffle plate 52 for cooling, and then continuously rises through the reserved gap 54.
The top of the second chamber 2 is connected with the flue gas heating device 4, the second chamber 2 is communicated with the tube pass inlet of the flue gas heating device 4, and the tube pass outlet of the flue gas heating device 4 is communicated with the third chamber 3. The flue gas heating device 4 adopts a shell-and-tube heat exchanger.
Referring to fig. 4, a standby direct-mixing flue gas heating device 7 is fixed at the lower part of the third chamber 3, the standby direct-mixing flue gas heating device 7 is composed of a heating gas pipe 71 and a plurality of gas nozzles 72, and the plurality of gas nozzles 72 are fixed on the heating gas pipe 71. Waste heat air in links such as a blast furnace hot blast stove flows through the heating air pipe 71, and is sprayed into the slag water quenching and granulating tower through the air nozzle 72 to be mixed and heated with flue gas generated in the granulating process, so that the temperature of the flue gas discharged by the slag water quenching and granulating tower is increased. A negative pressure fan 8 is fixed to the upper part of the third chamber 3.
The working principle is as follows:
when the molten metal flows into the first chamber 1 through the slag chute 11, the molten metal is broken into small particles by the action of pressurized water ejected from the flushing tank 12, in the process of which a large amount of moisture-containing flue gas is produced. Because the slag water quenching and granulating tower is a cylindrical or conical cup body, and only one upper opening is formed, a large amount of water-containing flue gas generated in the process of blast furnace slag water quenching and granulating can only be emitted through the only outlet at the upper part of the slag water quenching and granulating tower, the opening is provided with the negative pressure fan 8, the negative pressure fan 8 helps the slag water quenching and granulating tower to exchange air, the air flow speed in the third chamber 3 is increased under the action of the negative pressure fan 8, at the moment, the air pressure in the third chamber 3 is reduced and is smaller than the air pressure in the second chamber 2 and the first chamber 1, the water-containing flue gas is accelerated under the action of pressure, and the trend of the flue gas is ensured to enter the third chamber 3 from the first chamber 1 through the second chamber 2 and pass through the cooling and atomizing device 6, the baffle plate defogging device 5 and the flue gas heating device 4 in the second chamber 2.
At this time, the water-containing flue gas continuously rises and flows into the second chamber 2 from the first chamber 1, and the water-containing flue gas is fully contacted with the cooling atomized water drops sprayed by the cooling atomization device 6 in the second chamber 2 to cool and wash the water-containing flue gas. Because the temperature of the water-containing flue gas is reduced, the water vapor content in the water-containing flue gas is reduced, the flue gas dehumidification effect is achieved, and meanwhile dust particles contained in the flue gas are intercepted by the atomized water drops, and the flue gas dedusting effect is achieved.
The once treated water-containing flue gas and atomized water drops are cooled and condensed into large water drops through the baffle plate demisting device 5, and the large water drops are gathered into water flow, collected intensively, discharged out of the slag water quenching granulation tower for cooling, and enter the atomizing nozzle 62 again for recycling. In order to enhance the cooling effect of the water-containing flue gas, the baffle plate demisting device 5 is made of metal materials; a shower mechanism 51 is provided above the baffle plate 52, and high-pressure atomized water is periodically sprayed through nozzles of the shower mechanism 51 to clean the object.
At the moment, the water-containing flue gas and the atomized water drops are continuously lifted after secondary treatment and discharged after heat exchange of the 4 tube passes of the flue gas heating device. The heat source of the flue gas heating device 4 is water-containing flue gas generated by water quenching granulation, when the water-containing flue gas enters the flue gas heating device 4 from the first chamber 1 through the gas outlet flue 21, then enters the gas return flue 22 through the flue gas heating device 4, and enters the second chamber 2 through the gas return flue 22, the water-containing flue gas transfers heat to the flue gas heating device 4 through the shell pass circulation, so that the flue gas heating device 4 does not need to reuse an external heat source, and the effects of more energy conservation and more efficiency are realized.
After the water-containing flue gas is washed and heat-exchanged twice, the flue gas is washed and washed, the water vapor is collected, cooled and recycled through spraying heat exchange and baffle plate demisting condensation, the treated water-containing flue gas reaches the emission standard of environmental protection, and is discharged to the natural environment after being heated and heat-exchanged by the flue gas heating device 4, so that the effects of more environmental protection and white smoke elimination are achieved.
However, in the case of extremely cold weather in winter, the whitening effect may be not significant due to the low temperature, and at this time, the standby direct-mixing flue gas heating device 7 located below the fan is manually turned on according to the whitening effect. The high-temperature gas in the flue gas standby direct-mixing heating device 7 is waste heat air in links such as a blast furnace hot blast stove and the like, is sprayed into the slag water quenching granulation tower to be mixed and heated with the treated flue gas generated in the granulation process, so that the temperature of the flue gas discharged by the slag water quenching granulation tower is increased, and the problem of poor white smoke elimination effect in extremely cold weather in winter is solved. Even in severe weather and at lower temperature, no white smoke is generated, and a more obvious whitening effect is achieved.
Finally, it is noted that: the preferred embodiments of the present invention have been shown and described, and modifications and variations of the present invention may be made by those skilled in the art without departing from the scope of the present invention.
Claims (7)
1. A blast furnace slag water quenching and flue gas treatment tower system comprises a slag water quenching granulation tower and is characterized in that,
the slag water quenching granulation tower comprises a first chamber and a second chamber, the first chamber is respectively provided with a slag chute and a slag outlet, and the top of the first chamber is separated from the second chamber by a partition plate;
a cooling atomization device and a baffle plate demisting device are sequentially fixed in the second chamber from bottom to top, and a flue gas heating device is fixed at the top of the second chamber;
the flue gas heating device is communicated with the first cavity through the air outlet flue, the flue gas heating device is communicated with the second cavity through the air return flue, and the bottom of the second cavity is provided with a water outlet.
2. The blast furnace slag water quenching and flue gas treatment tower system as claimed in claim 1, wherein the baffle plate demisting device comprises a spray mechanism and a baffle plate, and the spray mechanism is fixed above the baffle plate.
3. The blast furnace slag water quenching and flue gas treatment tower system of claim 1, wherein water sealing covers are fixed on the inner sides of the slag chute, the slag outlet and the water outlet respectively.
4. The blast furnace slag water quenching and flue gas treatment tower system of claim 1, wherein a punching tank is fixed below the slag chute.
5. The blast furnace slag water quenching and flue gas treatment tower system as claimed in claim 1, wherein the partition plate is fixed at the bottom of the second chamber in an inclined manner.
6. The blast furnace slag water quenching and flue gas treatment tower system as claimed in claim 1, wherein the slag water quenching granulation tower further comprises a third chamber communicated with the outside, the third chamber is arranged above the flue gas heating device, and a negative pressure fan is fixed on the upper part of the third chamber.
7. The blast furnace slag water quenching and flue gas treatment tower system of claim 6, wherein a flue gas standby direct-mixing heating device is fixed at the bottom of the third chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220545183.5U CN217127457U (en) | 2022-03-14 | 2022-03-14 | Blast furnace slag water quenching and flue gas treatment tower system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220545183.5U CN217127457U (en) | 2022-03-14 | 2022-03-14 | Blast furnace slag water quenching and flue gas treatment tower system |
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| Publication Number | Publication Date |
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| CN217127457U true CN217127457U (en) | 2022-08-05 |
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| CN202220545183.5U Active CN217127457U (en) | 2022-03-14 | 2022-03-14 | Blast furnace slag water quenching and flue gas treatment tower system |
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| CN (1) | CN217127457U (en) |
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- 2022-03-14 CN CN202220545183.5U patent/CN217127457U/en active Active
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