CN218001460U - Environment-friendly waste heat recovery boiler for treating carbon calcining furnace flue gas - Google Patents
Environment-friendly waste heat recovery boiler for treating carbon calcining furnace flue gas Download PDFInfo
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- CN218001460U CN218001460U CN202221485926.0U CN202221485926U CN218001460U CN 218001460 U CN218001460 U CN 218001460U CN 202221485926 U CN202221485926 U CN 202221485926U CN 218001460 U CN218001460 U CN 218001460U
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Abstract
The utility model discloses an environment-friendly waste heat recovery boiler for treating carbon calcining furnace flue gas, which comprises a high-temperature flue gas calcium spraying desulfurization system and an ammonia spraying unit, wherein the high-temperature flue gas calcium spraying desulfurization system consists of a desulfurization reaction unit and a heat insulation desulfurization reaction unit; the inlet of the waste heat recovery boiler is respectively provided with a desulfurization reaction unit and an adiabatic desulfurization reaction unit; an ammonia spraying unit and an anticorrosion unit are arranged in the waste heat recovery boiler, and a denitration reaction unit is arranged between the ammonia spraying unit and the anticorrosion unit; the denitration reaction unit comprises an air distribution plate, a denitration reaction tower and an ash removal mechanism; the air distribution plate is arranged between the denitration reaction tower and the ammonia spraying unit; the deashing mechanism sets up outside denitration reaction tower, the utility model discloses ensure whole denitration, the desulfurization environmental protection effect when forging burning furnace output improvement or using high-sulfur petroleum coke as fuel to make waste heat recovery system become the plain waste heat recovery boiler system of charcoal of a new environment-friendly type of calcining furnace flue gas.
Description
Technical Field
The utility model relates to an atmosphere pollution control and waste heat comprehensive utilization's technical field, more specifically relates to an environment-friendly waste heat recovery boiler to carbon calciner flue gas treatment.
Background
The carbon product is an industrial raw material of aluminum and is mainly used for producing electrolytic aluminum. The method comprises the steps of feeding petroleum coke as a raw material into a carbon calciner, and calcining at a high temperature to generate calcined coke. The calcined coke is mixed with asphalt after being screened and ground, and then is kneaded and roasted to form the anode for aluminum.
The carbon calciner is a thermal device for carrying out heat treatment on carbon materials under the condition of isolating the carbon materials from air. The heat treatment has the functions of releasing moisture and volatile matters in the carbon material, shrinking the production volume, increasing the true specific gravity and the like so as to obtain better electric and heat conduction performance. After the petroleum coke is calcined by a carbon calciner, a large amount of high-temperature flue gas at 800-1050 ℃ is generated, and a waste heat recovery boiler is generally used for recovering waste heat in the high-temperature flue gas to generate steam in the industry at present, and the steam is used for centralized heating, industrial steam or power generation.
At present, the condition that high-sulfur petroleum coke is calcined in carbon plants is more and more common, the sulfur content in flue gas is higher, and SO of individual plants is caused 2 The initial concentration of (A) may be as high as 4000-6000mg/Nm 3 (ii) a The harmless treatment of the calciner outlet flue gas is therefore becoming more and more important. The utility model increases the correspondence based on the waste heat recovery boilerThe environmental protection measures can recover the waste heat, properly reduce the pressure of a subsequent desulfurization system and completely control the oxynitride to be 50mg/Nm 3 Thus becoming a new environment-friendly carbon calcining furnace flue gas waste heat recovery boiler system.
SUMMERY OF THE UTILITY MODEL
The utility model provides an environment-friendly waste heat recovery boiler that stove flue gas was handled is calcined to charcoal, this system spouts calcium desulfurization system through installing high temperature flue gas additional at the boiler entry, spout the calcium system in order to spray the desulfurizer through installing additional at the waste heat recovery boiler entry, the desulfurizer is limestone flour or calcium oxide powder, utilize the natural advantage of high temperature flue gas, carry out the desorption to sulphur in advance, thereby reduce follow-up desulfurization system's pressure and burden, guarantee whole desulfurization effect when calcining stove output and improving or use high sulphur petroleum coke as fuel.
The utility model discloses a following technical scheme realizes:
an environment-friendly waste heat recovery boiler for treating carbon calciner flue gas comprises a desulfurization reaction unit, an adiabatic desulfurization reaction unit, an ammonia spraying unit and an anticorrosion unit; the inlet of the waste heat recovery boiler is respectively provided with a desulfurization reaction unit and an adiabatic desulfurization reaction unit; the ammonia spraying unit is arranged in the waste heat recovery boiler; a denitration reaction unit is arranged in the waste heat recovery boiler and comprises an air distribution plate, a denitration reaction tower and an ash removal mechanism; the air distribution plate is arranged between the denitration reaction tower and the ammonia spraying unit; the ash removal mechanism is arranged outside the denitration reaction tower.
Furthermore, the air distribution plate is composed of two layers of pore plates, the distance between the two layers of pore plates is 300-400 mm, the pore plates are at least 2 pores with phi 220 on a 6mm thick steel plate, and the pores are arranged on the pore plates in a staggered manner.
Further, the dust removing mechanism adopts a sound wave dust remover, and the sound wave dust remover enters the waste heat recovery boiler through a sound wave guide pipe on the sound wave dust remover.
Further, the ammonia injection unit adopts an injection mode to inject the denitrifier into the flue gas flow of the waste heat recovery boiler.
Further, the desulfurization reaction unit is connected with a calcium sprayer through an injection channel, the calcium sprayer consists of a storage bin, a gate valve, an impeller feeder and a mixer, and limestone powder or calcium oxide powder is arranged in the storage bin; the bottom of the storage bin is connected with the desulfurization reaction unit through a gate valve, an impeller feeder and a mixer in sequence.
Further, a first ash cleaning port is arranged on the desulfurization reaction unit.
Further, a second reserved ash discharge port is arranged at the outlet of the waste heat recovery boiler.
Advantageous effects
The utility model has the advantages compared with the prior art:
the utility model discloses install high temperature flue gas at waste heat recovery boiler entry additional and spout calcium desulfurization system, through install additional at waste heat recovery boiler entry and spout the calcium system, utilize the natural advantage of high temperature flue gas, carry out the desorption to sulphur in advance to reduce follow-up desulfurization system's pressure and burden, ensure the whole desulfurization effect when forging burning furnace output improves or use high sulphur petroleum coke as fuel.
And (3) expanding the height of the internal space of the boiler and placing a built-in denitration reaction tower in the temperature range of 350-420 ℃ on the heat exchange surface at the tail part of the boiler. Considering that the dust concentration of flue gas is increased after the inlet of the boiler is sprayed with calcium, the number of holes of the catalyst of the denitration tower is not more than 18, and the sound wave ash removal device is added, and the air distribution plate is arranged in front of the denitration tower. The desulfurization reaction area at the boiler inlet and the boiler bottom corresponding to the heat exchange surface at the boiler tail are provided with dust cleaning holes.
Drawings
FIG. 1 is a schematic view of an environment-friendly waste heat recovery boiler for treating flue gas of a carbon calcining furnace.
Detailed Description
The invention will be further elucidated below on the basis of a specific embodiment.
As shown in fig. 1, the utility model provides an environment-friendly waste heat recovery boiler for treating flue gas of a carbon calcining furnace, which comprises a high-temperature flue gas calcium spraying desulfurization system consisting of a desulfurization reaction unit 101 and a heat insulation desulfurization reaction unit 201, an ammonia spraying unit 301 and an anticorrosion unit 501; the inlet of the waste heat recovery boiler is respectively provided with a desulfurization reaction unit 101 and an adiabatic desulfurization reaction unit 201; an ammonia spraying unit 301 is arranged in the waste heat recovery boiler, and a denitration reaction unit 401 is arranged between the ammonia spraying unit 301 and the anticorrosion unit 501; the ammonia injection unit 301 injects the denitrifier into the flue gas flow of the waste heat recovery boiler in an injection manner.
The denitration reaction unit 401 comprises an air distribution plate 402, a denitration reaction tower 403 and an ash removal mechanism 404; the air distribution plate 402 is arranged between the denitration reaction tower 403 and the ammonia injection unit 301; the ash removal mechanism 403 is arranged outside the denitration reaction tower 403. The air distribution plate 402 is composed of two layers of pore plates, the distance between the two layers of pore plates is 300-400 mm, the pore plates are manufactured by forming a plurality of phi 220 pores on a 6mm thick steel plate, the aperture ratio reaches more than 45%, and the aperture positions of the upper and lower layers of pore plates cannot be completely superposed in the vertical direction. The ash removal mechanism 404 is a sound wave ash removal device, and the sound wave ash removal device enters the waste heat recovery boiler through a sound wave guide pipe on the sound wave ash removal device.
The desulfurization reaction unit 101 is connected with the output end of a calcium sprayer 102 through a spraying channel, the calcium sprayer is composed of a storage bin 103, a gate valve 104, an impeller feeder 105 and a mixer 106, and limestone powder or calcium oxide powder is arranged in the storage bin 103; the bottom of the storage bin 103 is connected with the desulfurization reaction unit 101 through a gate valve 104, an impeller feeder 105 and a mixer 106 in sequence. The desulfurization reaction unit is provided with a first ash cleaning port 107.
The utility model discloses specific application process:
as shown in figure 1, the utility model relates to a carbon calciner export flue gas gets into the adiabatic district of waste heat recovery boiler entry, sets up the desulfurization reaction unit at adiabatic district flue gas inlet, and the desulfurization reaction unit divides two tunnel to spout inside the waste heat recovery boiler limestone flour or calcium oxide powder. In consideration of the optimal reaction temperature of the desulfurizing agent, limestone powder is sprayed when the flue gas temperature is higher than 850 ℃, and calcium oxide powder is sprayed when the flue gas temperature is lower than 850 ℃. In the specific implementation, one desulfurizing agent can be selected according to the actual situation. The desulfurizer reacts with sulfur in the flue gas to generate calcium sulfate, most of the calcium sulfate is carried away with the flue gas, a small amount of the calcium sulfate is deposited to the bottom, and the bottom is provided with an ash cleaning hole, so that when calcium sulfate powder or residual desulfurizer is accumulated to a certain degree, ash is discharged through the ash cleaning hole.
As shown in figure 1, a built-in denitration tower is arranged in a temperature range of 350-420 ℃ of the flue gas temperature of the tail heat exchange surface of the waste heat recovery boiler, and catalytic reaction denitration is carried out by spraying ammonia water or urea solution. The denitration tower is provided with an acoustic wave ash cleaner for cleaning ash regularly to avoid catalyst blockage. By reasonably setting the ammonia spraying position, the catalyst quantity and the air distribution plate, the ultralow emission effect of the oxynitride can be achieved.
The above description is only for the preferred embodiment of the present invention, but the present invention is not limited to the above-mentioned specific embodiments, and for those skilled in the art, it is possible to make several modifications and improvements without departing from the inventive concept, and these modifications and improvements are all within the protection scope of the present invention.
Claims (6)
1. An environment-friendly waste heat recovery boiler for treating carbon calciner flue gas comprises a high-temperature flue gas calcium spraying desulfurization system and an ammonia spraying unit, wherein the high-temperature flue gas calcium spraying desulfurization system consists of a desulfurization reaction unit and an adiabatic desulfurization reaction unit; the desulfurization reaction unit and the adiabatic desulfurization reaction unit are arranged at the inlet of the waste heat recovery boiler; the ammonia spraying unit is arranged in the waste heat recovery boiler, and is characterized in that:
the desulfurization reaction unit is connected with a calcium sprayer through an injection channel, the calcium sprayer consists of a storage bin, a gate valve, an impeller feeder and a mixer, and limestone powder or calcium oxide powder is arranged in the storage bin; the bottom of the storage bin is connected with the desulfurization reaction unit through a gate valve, an impeller feeder and a mixer in sequence;
a denitration reaction unit is also arranged in the waste heat recovery boiler; the denitration reaction unit comprises an air distribution plate, a denitration reaction tower and an ash removal mechanism; the air distribution plate is arranged between the denitration reaction tower and the ammonia spraying unit; the ash removal mechanism is arranged outside the denitration reaction tower.
2. The environment-friendly waste heat recovery boiler for treating carbon calcining furnace flue gas as claimed in claim 1, is characterized in that: the air distribution plate is composed of two layers of pore plates, the distance between the two layers of pore plates is 300-400 mm, the pore plates are provided with at least 2 holes with phi 220 on a 6mm thick steel plate, and the holes are arranged on the pore plates in a staggered manner.
3. The environment-friendly waste heat recovery boiler for treating carbon calcining furnace flue gas as claimed in claim 1, is characterized in that: the dust removing mechanism adopts a sound wave dust remover, and the sound wave dust remover enters the waste heat recovery boiler through a sound wave guide pipe on the sound wave dust remover.
4. The environment-friendly waste heat recovery boiler for treating carbon calcining furnace flue gas as claimed in claim 1, is characterized in that: and the ammonia spraying unit enters the flue gas channel of the waste heat recovery boiler in a denitration agent spraying mode.
5. The environment-friendly waste heat recovery boiler for treating carbon calcining furnace flue gas as claimed in claim 1, is characterized in that: and the desulfurization reaction unit is provided with a first ash removal port.
6. The environment-friendly waste heat recovery boiler for treating carbon calciner flue gas according to claim 1, which is characterized in that: the waste heat recovery boiler is provided with a second reserved ash discharge port; and the second reserved ash discharging port is arranged at the outlet of the waste heat recovery boiler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221485926.0U CN218001460U (en) | 2022-06-15 | 2022-06-15 | Environment-friendly waste heat recovery boiler for treating carbon calcining furnace flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221485926.0U CN218001460U (en) | 2022-06-15 | 2022-06-15 | Environment-friendly waste heat recovery boiler for treating carbon calcining furnace flue gas |
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| Publication Number | Publication Date |
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| CN218001460U true CN218001460U (en) | 2022-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221485926.0U Active CN218001460U (en) | 2022-06-15 | 2022-06-15 | Environment-friendly waste heat recovery boiler for treating carbon calcining furnace flue gas |
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| CN (1) | CN218001460U (en) |
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2022
- 2022-06-15 CN CN202221485926.0U patent/CN218001460U/en active Active
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