CN204447735U - A kind of Pneumatic emulsifying flyash desulphurization system - Google Patents

Abstract

A pneumatic emulsification fly ash desulfurization system disclosed in the utility model is used for treating sulfur-containing boiler flue gas, which includes a bag filter, a screw conveyor and a pneumatic emulsification desulfurization tower, wherein: the screw conveyor and the pneumatic emulsification Between the desulfurization towers, a pulping pool and a circulation pool are arranged in sequence, and the outlet of the screw conveyor faces the pulping pool; the bag filter is arranged between the boiler flue gas and the screw conveyor for Flue gas dust removal and separation of fly ash waste in the flue gas; the bag filter is provided with a number of spaced dust removal chambers and separation chambers that run through the dust removal chambers, and the separation chambers are funnel-shaped and funnel-shaped The small end faces the screw conveyor. This system can use the fly ash product of pulverized coal combustion to prepare desulfurization slurry, desulfurization and self-purification, convenient material collection, avoiding transportation and storage, and greatly saving costs.

Description

A pneumatic emulsified fly ash desulfurization system

technical field

The utility model relates to the technical field of environmental protection equipment, in particular to a pneumatic emulsified fly ash desulfurization system.

Background technique

The pulverized coal burns in a suspended state in the furnace. On the one hand, most of the combustibles in the coal can be burned out in the furnace, thereby producing a large amount of harmful gases such as SO ₂ , which are directly discharged into the atmosphere without treatment. , will pollute the environment. On the other hand, there are some non-combustibles in coal, and the main component is ash. A large amount of ash is mixed in the high-temperature flue gas containing _SO2 , and is partially melted due to high temperature, forming a large number of fine spherical particles. Under the action of the induced draft fan at the tail of the boiler, the flue gas containing a large amount of ash flows to the tail of the furnace. As the temperature of the flue gas decreases, a part of the molten fine particles gradually precipitates due to rapid cooling and becomes a glassy state, forming fly ash. This fly ash is the main solid waste discharged from coal-fired boilers, and its main oxide composition is SiO ₂ And a small amount of Al ₂ O ₃ , Fe ₂ O ₃ , CaO, TiO ₂ , the rest is carbon particles, and the content of basic oxide CaO is about 15%~22%. Fly ash is an industrial waste, if it is not treated, it will generate dust and pollute the atmosphere. In the traditional technology, the harmful gas and industrial waste residue after pulverized coal combustion are processed through different systems, the structure is complex, and the treatment cost is high; in addition, it is difficult to separate the harmful gas and industrial waste residue produced by combustion, or the separation equipment is relatively complicated ,high cost.

Contents of the invention

The utility model provides a pneumatic emulsified fly ash desulfurization system, which is used for overcoming the technical defect in the prior art that the harmful gas and industrial waste residue after pulverized coal combustion are difficult to be sorted and processed easily.

Based on the above problems, the utility model provides a pneumatic emulsified fly ash desulfurization system for treating sulfur-containing boiler flue gas, which includes a bag filter, a screw conveyor and a pneumatic emulsified desulfurization tower, wherein: the screw conveying Between the machine and the pneumatic emulsification desulfurization tower, there is a pulping pool and a circulation pool in sequence, and the outlet of the screw conveyor faces the pulping pool; the bag filter is installed between the boiler flue gas and the screw conveyor The room is used for flue gas dust removal and separation of fly ash waste in the flue gas; the bag filter is equipped with several spaced dust removal chambers and a separation chamber that runs through the dust removal chamber, and the separation chamber is Funnel-shaped and the small end of the funnel faces the screw conveyor.

Further, the pneumatic emulsification desulfurization tower is provided with a liquid outlet, an air equalization chamber, an emulsification desulfurization chamber, a mist removal chamber and a chimney at the top of the tower sequentially from bottom to top, wherein: the air equalization chamber communicates with the dust removal chamber, The liquid discharge port, the circulation pool and the emulsification desulfurization chamber are in circulation communication.

Further, a number of independent emulsification desulfurization chambers and equalization chambers matching the emulsification desulfurization chambers are provided below the demisting chamber, and each emulsification desulfurization chamber is axially arranged with multiple layers for desulfurization. Turbulence generator.

Further, the cross section of the emulsification desulfurization chamber is polygonal, and the volume of each emulsification desulfurization chamber is different.

Further, the system is provided with two emulsification desulfurization chambers, and the cross-section is circular, square, or hexagonal.

Further, the system also includes a fresh water source and a flushing water pump, and the fresh water source is pressurized by the flushing water pump and sent to the demisting chamber for flushing.

Further, the fresh water source is also in communication with the pulping tank and the circulation tank.

Further, the end of the circulating pool is connected to a filter press, and the circulating pool discharges the solid-containing slurry to the filter press through a slurry discharge pump for solid-liquid separation, and the separated filtrate is returned to the filter press. pulp pool.

Further, the fresh water source is pressurized by the flushing water pump and sent to the filter press for flushing.

Further, a pump for providing power is provided between the bag filter and the pneumatic emulsification desulfurization tower, between the pulping tank and the circulation tank, and between the circulation tank and the filter press.

The beneficial effects of the utility model include: a pneumatic emulsified fly ash desulfurization system provided by the utility model can use the fly ash product of pulverized coal combustion to prepare desulfurization slurry, desulfurization self-purification, convenient material extraction, avoiding transportation and storage, and can Great cost savings.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of the utility model.

Fig. 2 is a schematic structural diagram of the pneumatic emulsification desulfurization tower and the circulation pool in Fig. 1 .

Detailed ways

The specific implementation of a pneumatic emulsified fly ash desulfurization system of the present invention will be described below in combination with the drawings in the description.

Referring to Fig. 1, a pneumatic emulsified fly ash desulfurization system provided by an embodiment of the present invention is used to treat sulfur-containing boiler flue gas 1, which includes a bag filter 2, a screw conveyor 3 and a pneumatic emulsified desulfurization tower 6, Among them: between the screw conveyor 3 and the pneumatic emulsification desulfurization tower 6, a pulping pool 4 and a circulation pool 5 are arranged in sequence, the outlet of the screw conveyor 3 faces the pulping pool 4, and one end of the circulation pool 5 is connected to the pulping pool 4, The other end is connected with the pneumatic emulsification desulfurization tower 6; the bag filter 2 is set between the boiler flue gas 1 and the screw conveyor 3, and is used for flue gas dust removal and separation of fly ash waste in the flue gas; inside the bag filter 2 There are several spaced dust removal chambers 20 and a sorting chamber 21 that runs through the dust removal chambers 20. The sorting chamber 21 is funnel-shaped and the small end of the funnel faces the screw conveyor 3. The boiler flue gas 1 passes through the dust removal chamber 20 and enters the funnel shape. Sorting chamber 21, the sulfur-containing flue gas and fly ash are sorted and separated, the fly ash solid slag falls from the small end of the funnel onto the screw conveyor 3, and is transported to the pulping tank 4, the CaO of the fly ash The content is about 15%~22%, which can be used to prepare desulfurization slurry, and the slurry is pumped into the pneumatic emulsification desulfurization tower 6 through the circulation pool 5.

Referring to Figure 2, the pneumatic emulsification desulfurization tower 6 is sequentially provided with a liquid discharge port, an air equalization chamber 61, an emulsification desulfurization chamber 62, a mist removal chamber 63 and a chimney at the top of the tower from bottom to top, wherein: the air equalization chamber 61 communicates with the dust removal chamber 20 ; Circulating communication between the drain port, the circulation pool 5 and the emulsification desulfurization chamber 62 . Specifically, on the one hand, the desulfurization slurry is pumped from the circulation tank 5 into the emulsification desulfurization chamber 62; After the desulfurization slurry meets, the mass transfer is sufficient, and the SO ₂ in the flue gas reacts with the desulfurizer in the slurry to be absorbed. The slurry that has absorbed SO ₂ falls into the circulation pool 5 from the discharge port, and is evenly stirred with the slurry in the pool under the action of the mixer, and then sent to the emulsification desulfurization chamber 62 again for desulfurization, so that it can be recycled to save costs.

Preferably, several independent emulsification desulfurization chambers 62 and equalizing chambers 61 matching the emulsification desulfurization chambers 62 are provided below the mist removal chamber 63, and each emulsification desulfurization chamber 62 is axially arranged with multiple layers of turbulence for desulfurization. stream generator 64 . More preferably, the emulsification desulfurization chamber 62 has a polygonal cross section, and the volume of each emulsification desulfurization chamber 62 is different. When in use, one or several emulsification desulfurization chambers 62 can be controllably opened according to the exhaust volume of the boiler flue gas 1 for desulfurization, while the rest do not work, saving cost. In this embodiment, the system is provided with two emulsification desulfurization chambers 62, the cross section of which is circular, square, or hexagonal, and the volume ratio of the two emulsification desulfurization chambers 62 is 2:3, which can be applied to different working conditions .

Referring again to Fig. 1 in detail, the system also includes a fresh water source 8 and a flushing water pump 9, and the fresh water source 8 is pressurized by the flushing water pump 9 and sent to the demisting chamber 63 for flushing.

The fresh water source 8 is also in communication with the slurry tank 4 and the circulation tank 5 . The end of the circulating pool 5 is connected to the filter press 7, and the circulating pool 5 discharges the solid-containing slurry to the filter press 7 through a slurry discharge pump for solid-liquid separation, and the separated filtrate is returned to the pulping pool 4.

The fresh water source 8 is pressurized by the flushing water pump 9 and then sent to the filter press 7 for flushing to realize automatic circulation work.

In addition, there are agitators in the pulping tank 4 and the circulating tank 5; Both are equipped with pumps for power supply.

It should be noted that CaO in fly ash is a kind of calcium-based desulfurization agent. When the fly ash water is under acidic conditions, the dissolution of Ca ²⁺ ions is relatively high, so the fly ash water has a certain desulfurization ability. . Its chemical reaction process is described as follows:

1. CaO dissolution reaction, CaO in fly ash reacts with water to produce slaked lime Ca(OH) ₂ :

That is, CaO + H ₂ O = Ca(OH) ₂

2. The dissolution reaction of SO ₂ , the SO ₂ water in the flue gas reacts to form sulfurous acid H ₂ SO ₃ :

That is, SO ₂ +H ₂ O = H ₂ SO ₃

3. Neutralization reaction, Ca(OH) ₂ reacts with H ₂ SO ₃ to generate calcium sulfite CaSO ₃ :

That is, CaCO ₃ + H ₂ SO ₃ = CaSO ₃ +H ₂ O+CO ₂

4. Oxidation reaction, calcium sulfite is oxidized to calcium sulfate

That is, 2CaSO ₃ +O ₂ = 2CaSO ₄

5. Crystallization reaction, calcium sulfate precipitates out in a saturated state and crystallizes.

The combustion products of pulverized coal are dedusted by the bag filter 2, the sulfur-containing flue gas and fly ash are sorted and separated, and the fly ash is used to prepare desulfurization slurry. Desulfurization reaction occurs in 6, and the desulfurized flue gas is dehydrated and discharged into the atmosphere, which will not pollute the environment. The filter residue calcium sulfate generated after the desulfurization reaction is collected in filter press 7, and will not pollute the environment.

The pneumatic emulsified fly ash desulfurization system of the utility model can use the fly ash product of pulverized coal combustion to prepare desulfurization slurry, which is self-cleaning in desulfurization, convenient to obtain materials, avoids transportation and storage, and can greatly save costs.

The above-mentioned embodiments only express several implementations of the utility model, and the description thereof is relatively specific and detailed, but it should not be construed as limiting the patent scope of the utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (10)

1. A pneumatic emulsified fly ash desulfurization system for treating sulfur-containing boiler flue gas (1), characterized in that it includes a bag filter (2), a screw conveyor (3) and a pneumatic emulsified desulfurization tower (6 ),in: Between the screw conveyor (3) and the pneumatic emulsification desulfurization tower (6), a pulping tank (4) and a circulation tank (5) are arranged in sequence, and the outlet of the screw conveyor (3) faces the pulping pool(4); The bag filter (2) is installed between the boiler flue gas (1) and the screw conveyor (3), and is used for dust removal from the flue gas and sorting the fly ash waste in the flue gas; the bag filter (2) There are several spaced dust removal chambers (20) and a separation chamber (21) penetrating the dust removal chamber (20), the separation chamber (21) is funnel-shaped and the small end of the funnel faces the Screw conveyor (3). 2. The pneumatic emulsification fly ash desulfurization system according to claim 1, characterized in that the pneumatic emulsification desulfurization tower (6) is provided with a liquid discharge port, an air equalization chamber (61), an emulsification desulfurization desulfurization tower (6) in sequence from bottom to top. chamber (62), demister chamber (63) and chimney at the top of the tower, wherein: the air equalization chamber (61) communicates with the dust removal chamber (20), the liquid outlet, circulation pool (5) and emulsification desulfurization The chambers (62) are circulated in communication. 3. The pneumatic emulsified fly ash desulfurization system according to claim 2, characterized in that several independent emulsification desulfurization chambers (62) and the emulsification desulfurization chambers ( 62) One-to-one matched gas equalization chambers (61), each emulsification desulfurization chamber (62) is axially arranged with multiple layers of turbulence generators (64) for desulfurization. 4. The pneumatic emulsified fly ash desulfurization system according to claim 3, characterized in that the cross-section of the emulsification desulfurization chamber (62) is polygonal, and the volume of each emulsification desulfurization chamber (62) is different . 5. The pneumatic emulsification fly ash desulfurization system according to claim 4, characterized in that the system is provided with two emulsification desulfurization chambers (62), and the cross-section is circular, square, or hexagonal. 6. The pneumatic emulsified fly ash desulfurization system according to any one of claims 2 to 5, characterized in that the system also includes a fresh water source (8) and a flushing water pump (9), and the fresh water source (8 ) is sent to the demister chamber (63) for flushing after being pressurized by the flushing water pump (9). 7. The pneumatic emulsified fly ash desulfurization system according to claim 6, characterized in that the fresh water source (8) is also in communication with the pulping pool (4) and the circulation pool (5). 8. The pneumatic emulsified fly ash desulfurization system according to claim 6, characterized in that, the end of the circulating pool (5) is connected to a filter press (7), and the circulating pool (5) uses a slurry discharge pump to The solid-containing slurry is discharged to the filter press (7) for solid-liquid separation, and the separated filtrate is returned to the slurry tank (4). 9. The pneumatic emulsified fly ash desulfurization system according to claim 8, characterized in that the fresh water source (8) is pressurized by the flushing water pump (9) and sent to the filter press (7) for flushing. 10. The pneumatic emulsification fly ash desulfurization system according to claim 8, characterized in that, between the bag filter (2) and the pneumatic emulsification desulfurization tower (6), the pulping pool (4) and the circulation A pump for providing power is provided between the pools (5) and between the circulation pool (5) and the filter press (7).