CN218422020U - Utilize tail gas absorption system of papermaking white mud as desulfurizer - Google Patents
Utilize tail gas absorption system of papermaking white mud as desulfurizer Download PDFInfo
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- CN218422020U CN218422020U CN202222254507.2U CN202222254507U CN218422020U CN 218422020 U CN218422020 U CN 218422020U CN 202222254507 U CN202222254507 U CN 202222254507U CN 218422020 U CN218422020 U CN 218422020U
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Abstract
The utility model belongs to the field of environmental protection equipment, and discloses a tail gas absorption system using papermaking white mud as a desulfurizer, which comprises a white mud slurry preparation unit, a desulfurizing tower and a gypsum solid-liquid separation unit, wherein the desulfurizing tower is provided with a water replenishing pipe, a grouting pipe, a plurality of reflux pump connecting flanges and a gypsum discharge port; the upper part of the desulfurizing tower is provided with a spraying module and a packing layer positioned above the spraying module; a clear water injection pipe is connected above the spraying module; the middle part of desulfurizing tower is equipped with the waste gas entry and the top is equipped with the discharge port. The system mainly comprises three parts: the white mud slurry preparation unit, the desulfurization tower and the gypsum solid-liquid separation unit are adopted, liquid obtained by the gypsum solid-liquid separation unit is injected into the desulfurization tower from the middle part, and a clear water injection pipe is arranged at the top of the desulfurization tower, so that a packing layer and a spraying module in the tower can be cleaned, and meanwhile, gypsum separation waste liquid can be recycled; by the scheme, the efficient operation of the desulfurizing tower, the recycling of water and the conversion of solid waste into gypsum are realized.
Description
Technical Field
The utility model relates to an environmental protection equipment field specifically is an utilize tail gas absorption system that desulfurizer was made to papermaking white mud.
Background
In the process of alkali recovery, a large amount of causticized white mud (also called papermaking white mud) is produced in pulping and papermaking plants, the causticized white mud which takes wood as a raw material is calcined by a lime kiln, and a plurality of large-scale paper mills at home and abroad adopt a lime kiln calcination method to regenerate the white mud and produce regenerated lime which is recycled in causticization. Because the white mud contains silicon, if the white mud is recycled, the silicon interference of alkali recovery is aggravated, so that the alkali recovery cannot normally operate, the white mud cannot be properly treated all the time, or the white mud is pulled to fill a pit for paving, or is directly discharged into a river, so that the environmental pollution is caused, and simultaneously, a huge amount of pollution discharge cost is paid. With the increasing enhancement of environmental protection work in recent years, the treatment of papermaking white mud becomes a difficult problem which is urgently needed to be solved by many enterprises.
The white mud is from the white mud recovery section of an alkali recovery plant and is a causticization reaction product Na 2 CO 3 +Ca(OH) 2 ＝2NaOH+CaCO 3 。
The white mud component is mainly calcium carbonate, as shown in Table 1. In addition, lime (present in the form of Ca (OH) 2) which is added in excess during the causticization process is also contained. Calcium silicate, residual sodium hydroxide, and sodium sulfide, aluminum, iron, magnesium compounds, dust impurities, etc., which vary depending on the fiber material.
TABLE 1 main chemical composition of papermaking white mud
| Loss on firing/%) | SiO2/％ | Al2O3/％ | Fe2O3/％ | CaO/％ | MgO/％ | |
| White mud of this pulp | 38.1 | 3.38 | 3.4 | 1.2 | 51 | 2.75 |
| Straw pulp white mud | 38.83 | 7.49-11 | 0.46 | 0.17 | 44.4 | 0.55 |
The mainstream process of the existing flue gas desulfurization is a limestone/gypsum method, and the desulfurizing agent mainly adopts limestone. The main component of the papermaking white mud is CaCO 3 And a small amount of Ca (OH) 2 The desulfurizer is used as a desulfurizer to remove sulfur dioxide in flue gas, so that the operation cost can be reduced, and the purpose of comprehensive utilization of 'treating waste with waste' can be achieved.
The basic method described above has been disclosed with the following scheme:
CN200810062830.1 discloses a method for removing sulfur dioxide in flue gas by white mud, which adopts white mud slurry as a desulfurization solution to carry out two-stage absorption desulfurization, demisting and discharging on sulfur dioxide in flue gas; collecting the desulfurization solution absorbed in the first stage at a low position, storing and recycling the desulfurization solution to form a low position cycle, collecting the desulfurization solution absorbed in the second stage at a high position, storing and recycling the desulfurization solution to form a high position cycle; the desulfurization solution stored in the high-position circulation overflows to the low-position circulation, the desulfurization gypsum generated by the low-position circulation is pumped out for cyclone separation, the top flow thin gypsum slurry flows back to the high-position circulation, and the bottom flow thick gypsum slurry is subjected to slag removal treatment.
The scheme performs two-stage absorption in the desulfurizing tower, and is more suitable for the environment in which the scheme is applicable.
However, in the application environment of the present application, the whole treatment process is expected to achieve the purpose of zero emission as much as possible.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an utilize tail gas absorption system that desulfurizer is made to papermaking white mud, this system mainly includes the three: the white mud slurry preparation unit, the desulfurizing tower and the gypsum solid-liquid separation unit, wherein liquid obtained by the gypsum solid-liquid separation unit is injected into the desulfurizing tower from the middle part, and a clear water injection pipe is arranged at the top part of the desulfurizing tower, so that a packing layer and a spraying module in the desulfurizing tower can be cleaned, and meanwhile, gypsum separation waste liquid can be recycled; by the scheme, the efficient operation of the desulfurizing tower, the recycling of water and the conversion of solid waste into gypsum are realized.
In order to achieve the above object, the utility model provides a following technical scheme: a tail gas absorption system using papermaking white mud as a desulfurizer comprises a white mud slurry preparation unit, a desulfurization tower and a gypsum solid-liquid separation unit, wherein the lower part of the desulfurization tower is sequentially provided with a water replenishing pipe, a grouting pipe, a plurality of reflux pump connecting flanges and a gypsum discharge port from top to bottom; the gypsum discharge port is connected to an inlet of the gypsum solid-liquid separation unit; a liquid outlet of the gypsum solid-liquid separation unit is connected to a water replenishing pipe; the grouting pipe is connected to an outlet of the white mud proportioning unit; the upper part of the desulfurizing tower is provided with a spraying module and a packing layer positioned above the spraying module; a clear water injection pipe is connected above the spraying module; the middle part of the desulfurizing tower is provided with a waste gas inlet, and the top part of the desulfurizing tower is provided with a discharge outlet; the reflux pump connecting flanges are respectively and independently connected with a reflux pump; the reflux pump is connected to the spray module.
In the tail gas absorption system using the papermaking white mud as the desulfurizer, the spraying modules are multi-layer; each layer of spraying module is connected with a reflux pump; and the plurality of reflux pump connecting flanges are sequentially arranged at the lower part of the desulfurizing tower from top to bottom.
In the above exhaust gas absorption system using papermaking white mud as a desulfurizing agent, the clean water injection pipe extends to the inside, upper part and lower part of the packing layer.
In the tail gas absorption system using papermaking white mud as a desulfurizer, the white mud slurry preparation unit comprises a white mud slurry preparation pit and a white mud storage pit; a white mud pulping pump and a vibrating screen positioned above the white mud storage pit are arranged between the white mud pulping pit and the white mud storage pit; the vibrating screen is connected with the outlet of the lime mud pulping pump; and stirrers are arranged on the white mud pulping pit and the white mud storage pit.
In the above tail gas absorption system using papermaking white mud as a desulfurizing agent, a white mud liquid pump is arranged between the white mud storage pit and the grouting pipe.
In the tail gas absorption system using the papermaking white mud as the desulfurizer, the gypsum solid-liquid separation unit comprises a gypsum slurry cyclone station, a vacuum belt dehydrator and a filtrate water tank, wherein a liquid outlet of the gypsum slurry cyclone station is connected to the filtrate water tank; a solid outlet of the gypsum slurry cyclone station is connected to a vacuum belt dehydrator; the filtrate water tank is connected to the water replenishing pipe through a pump.
In the tail gas absorption system using the papermaking white mud as the desulfurizer, the lower part of the desulfurizing tower is also connected with an oxidation fan.
In the tail gas absorption system using the papermaking white mud as the desulfurizer, the white mud pulping pit is provided with a forklift feed hopper and a process water input pipe.
Compared with the prior art, the beneficial effects of the utility model are that:
the system mainly comprises three parts: the white mud slurry preparation unit, the desulfurization tower and the gypsum solid-liquid separation unit are adopted, liquid obtained by the gypsum solid-liquid separation unit is injected into the desulfurization tower from the middle part, and a clear water injection pipe is arranged at the top of the desulfurization tower, so that a packing layer and a spraying module in the tower can be cleaned, and meanwhile, gypsum separation waste liquid can be recycled; by the scheme, the efficient operation of the desulfurizing tower, the recycling of water and the conversion of solid waste into gypsum are realized.
The system is applied to the boiler flue gas desulfurization project of a certain company; the factory project uses papermaking white mud as a desulfurizer, and the flue gas SO meets the design working condition 2 The discharge concentration is less than or equal to 35mg/Nm 3 The desulfurization efficiency is more than or equal to 99.2 percent, and the quality water content of the desulfurized gypsum is not more than 15 percent.
Drawings
FIG. 1 is a flow chart of a pipeline in example 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1
Referring to fig. 1, a tail gas absorption system using papermaking white mud as a desulfurizing agent comprises a white mud slurry preparation unit, a desulfurizing tower 1 and a gypsum solid-liquid separation unit, wherein a water replenishing pipe 2, a grouting pipe 3, a plurality of reflux pump connecting flanges 4 and a gypsum discharge port 5 are sequentially arranged at the lower part of the desulfurizing tower 1 from top to bottom; the gypsum discharge port 5 is connected to an inlet of a gypsum solid-liquid separation unit; a liquid outlet of the gypsum solid-liquid separation unit is connected to the water replenishing pipe 2; implicitly, a pump is arranged on the water supplementing pipe 2, a pump is also arranged on a pipeline from the gypsum discharge port 5 to the gypsum solid-liquid separation unit, and the grouting pipe 3 is connected to an outlet of the white mud proportioning unit; the upper part of the desulfurizing tower 1 is provided with a spraying module 6 and a packing layer 7 positioned above the spraying module 6; a clear water injection pipe 8 is also connected above the spraying module 6; the middle part of the desulfurizing tower 1 is provided with a waste gas inlet 9, and the top part of the desulfurizing tower 1 is provided with a discharge port 10; the reflux pump connecting flanges 4 are respectively and independently connected with a reflux pump 11; the return pump 11 is connected to the spray module 6.
In the production process, white mud is prepared into mud by a white mud slurry preparation unit, and the mud is injected into the desulfurizing tower 1 from the grouting pipe 3; the desulfurization slurry is positioned at the bottom of the desulfurization tower 1; the generated gypsum is deposited on the lowest layer of the desulfurizing tower 1 and is output to a gypsum solid-liquid separation unit; the solid-liquid separation unit of gypsum carries out solid-liquid separation on the gypsum mixed solution, and the solid is sold as gypsum; the liquid flows back to the desulfurizing tower 1 from the water replenishing pipe 2. The reflux pump connecting flange 4 at the bottom of the desulfurizing tower 1 is connected with a plurality of reflux pumps 11, and liquid is pumped into the spraying module 6. In the operation process, generally speaking, intermittent water replenishing is needed, the water replenishing is injected from the clean water injection pipe 8, the water replenishing can be realized, the packing layer 7 and the spraying module 6 can be washed, and the continuous high efficiency of the desulfurizing tower 1 is kept.
Through the design, the efficient operation of the desulfurizing tower 1, the recycling of water and the conversion of solid waste into gypsum are realized.
Preferably, the spraying module 6 is multi-layer; each layer of spraying module 6 is connected with a reflux pump 11; the reflux pumps are connected with the flanges 4 and are sequentially arranged at the lower part of the desulfurizing tower 1 from top to bottom, and the clean water injection pipe 8 extends to the inner part, the upper part and the lower part of the packing layer 7.
In the embodiment, the white mud slurry preparation unit comprises a white mud slurry preparation pit 12 and a white mud storage pit 13; a white mud pulping pump 14 and a vibrating screen 15 positioned above the white mud storage pit 13 are arranged between the white mud pulping pit 12 and the white mud storage pit 13; the vibrating screen 15 is connected with the outlet of the lime mud pulping pump 14; the white mud pulping pit 12 and the white mud storage pit 13 are both provided with a stirrer. The vibrating screen 15 mainly removes large solid blocks in the slurry, and ensures that the slurry entering the desulfurizing tower 1 has no large-volume solid; and the inner wall of the white mud storage pit 13 is less deposited.
Preferably, a white mud liquid pump 16 is arranged between the white mud storage pit 13 and the grouting pipe 3, the gypsum solid-liquid separation unit comprises a gypsum slurry cyclone station 17, a vacuum belt dehydrator 18 and a filtrate water tank 19, and a liquid outlet of the gypsum slurry cyclone station 17 is connected to the filtrate water tank 19; the solid outlet of the gypsum slurry cyclone station 17 is connected to a vacuum belt dehydrator 18; the filtrate tank 19 is connected to the feed water pipe 2 by a pump. The water in the filtrate water tank 19 is reused in the desulfurizing tower 1, so that the liquid is reused.
In this embodiment, the lower portion of the desulfurizing tower 1 is further connected to an oxidation fan 20, and the white mud slurrying pit 12 is provided with a forklift feed hopper 21 and a process water input pipe 22.
Claims (8)
1. A tail gas absorption system using papermaking white mud as a desulfurizer comprises a white mud slurry preparation unit, a desulfurization tower and a gypsum solid-liquid separation unit, and is characterized in that a water replenishing pipe, a grouting pipe, a plurality of reflux pump connecting flanges and a gypsum discharge port are sequentially arranged at the lower part of the desulfurization tower from top to bottom; the gypsum discharge port is connected to an inlet of the gypsum solid-liquid separation unit; a liquid outlet of the gypsum solid-liquid separation unit is connected to a water replenishing pipe; the grouting pipe is connected to an outlet of the white mud proportioning unit; the upper part of the desulfurizing tower is provided with a spraying module and a packing layer positioned above the spraying module; a clear water injection pipe is connected above the spraying module; the middle part of the desulfurizing tower is provided with a waste gas inlet, and the top part of the desulfurizing tower is provided with a discharge outlet; the reflux pump connecting flanges are respectively and independently connected with a reflux pump; the reflux pump is connected to the spray module.
2. The tail gas absorption system using papermaking white mud as a desulfurizing agent according to claim 1, wherein the spraying modules are multi-layered; each layer of spraying module is connected with a reflux pump; and the plurality of reflux pump connecting flanges are sequentially arranged at the lower part of the desulfurizing tower from top to bottom.
3. The exhaust gas absorption system using white paper sludge as a desulfurizing agent according to claim 1, wherein the clean water injection pipe extends to the inside, upper portion and lower portion of the packing layer.
4. The tail gas absorption system using papermaking white mud as a desulfurizing agent according to claim 1, wherein the white mud proportioning unit comprises a white mud pulping pit and a white mud storage pit; a white mud pulping pump and a vibrating screen positioned above the white mud storage pit are arranged between the white mud pulping pit and the white mud storage pit; the vibrating screen is connected with the outlet of the lime mud pulping pump; and stirrers are arranged on the white mud pulping pit and the white mud storage pit.
5. The tail gas absorption system using papermaking white mud as a desulfurizing agent according to claim 4, wherein a white mud liquid pump is arranged between the white mud storage pit and the grouting pipe.
6. The tail gas absorption system using papermaking white mud as a desulfurizing agent according to claim 1, wherein the gypsum solid-liquid separation unit comprises a gypsum slurry cyclone station, a vacuum belt dehydrator and a filtrate water tank, and a liquid outlet of the gypsum slurry cyclone station is connected to the filtrate water tank; a solid outlet of the gypsum slurry swirling station is connected to a vacuum belt dehydrator; the filtrate water tank is connected to a water replenishing pipe through a pump.
7. The tail gas absorption system using papermaking white mud as a desulfurizing agent according to claim 1, wherein an oxidation fan is further connected to the lower part of the desulfurizing tower.
8. The tail gas absorption system using papermaking white mud as a desulfurizing agent according to claim 4, wherein a forklift feed hopper and a process water input pipe are arranged on the white mud pulping pit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222254507.2U CN218422020U (en) | 2022-08-25 | 2022-08-25 | Utilize tail gas absorption system of papermaking white mud as desulfurizer |
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| CN202222254507.2U CN218422020U (en) | 2022-08-25 | 2022-08-25 | Utilize tail gas absorption system of papermaking white mud as desulfurizer |
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