CN1843581A - Square absorption tower for wet method desulfurization of flue gas - Google Patents

Abstract

The invention relates to a smoke wet sulfur trioxide square adsorption tower. Wherein, the lower section of tower is a cycle slurry tank and the upper section is a washing reaction section; the sections of upper and lower sections are both rectangle and vertically connected; the lower part of upper section is connected to the smoke inlet tube; the middle part of upper section is mounted with spray tubes; the tangent part of top of tower is connected to the smoke outlet; a mixer and a vent tube are inserted into the lower cycle slurry tank. The invention can avoid the slurry deposition of slurry to improve the efficiency of desulfuration and apply the installment of said adsorption tower.

Description

Flue gas wet desulfurization square absorption tower

(1) Technical field

The invention relates to a flue gas wet desulfurization device.

(2) Background technology

In the existing wet desulfurization process, in order to remove sulfur in the flue gas, a reaction tower for flue gas reaction must be built, and the flue gas must be sent to the reaction tower through the flue for desulfurization reaction. Usually the reaction tower is round in steel, requiring special prefabrication and complex on-site assembly. The device is in the shape of a two-section variable-diameter vertical tower, the lower section is a gypsum slurry pool, the upper section is a desulfurization reaction section, and the lower part of the desulfurization reaction section is connected with the smoke inlet pipe. The design of the tower is complicated, the processing, welding and installation of the cylindrical tower body are difficult, the flow field distribution and flow velocity of the flue gas in the reaction tower are unreasonable, and the slurry in the slurry pool at the bottom of the reaction tower often deposits and scales, which affects desulfurization effect of flue gas.

(3) Contents of the invention

The purpose of the present invention is to provide a square absorption tower for flue gas wet desulfurization, to solve the problem of avoiding slurry deposition and fouling in the slurry pool at the bottom of the tower; and to solve the problem of further improving the efficiency of flue gas desulfurization; The technical problem of easy processing and installation of the desulfurization absorption tower.

The technical solution of the present invention: the flue gas wet desulfurization square absorption tower, the lower section of the tower body is a circulating slurry pool, and the upper section is a washing reaction section, which is characterized in that the cross-sections of the upper section and the lower section of the tower body are both rectangular and connected vertically. As a whole, the lower part of the upper section is connected to the smoke inlet pipe, the middle part of the upper section is equipped with a spray pipe, the tangential direction of the top of the tower body is connected to the flue gas outlet, and the agitator and ventilation pipe are inserted into the lower section of the circulating slurry tank.

The above-mentioned tower body is made of steel or concrete structure.

The insertion angle between the above-mentioned smoke inlet pipe and the desulfurization reaction section is 5-15 degrees.

The inner wall of the tower body is lined with an anti-corrosion layer.

The above-mentioned anti-corrosion layer is a rubber lining layer, a resin flake or a glass flake lining layer.

The thickness of the above-mentioned anti-corrosion layer is 2-10mm.

The thickness of the above-mentioned anticorrosion layer is 5-8mm.

Above-mentioned shower pipe has one to four layers.

The above-mentioned spray pipe includes a main pipe and branch pipes branched from both sides of the main pipe, and the two ends of the branch pipe are erected on the support on the wall of the absorption tower.

Compared with the existing traditional technology, the invention has beneficial effects: the tower body of the invention is a square or rectangular steel or concrete structure, which breaks through the inherent prejudice of adopting the traditional cylindrical tower body, and achieves unexpected technical effects. The upper and lower direct connection structure eliminates the carrier that is easy to deposit and scale, and solves the problem that the slurry in the bottom circulating slurry tank is easy to deposit and scale; the flow field distribution and flow rate of the flue gas in the reaction tower are reasonable, which improves the reaction speed and desulfurization Efficiency. At the same time, the square cylindrical tower has a simple shape, which is very convenient for processing and installation, and the cost is much lower than that of traditional absorption towers. It can be widely used in limestone (lime)-gypsum wet process or seawater desulfurization process. The flue gas processing capacity of the square absorption tower is equivalent to that of the traditional steel circular tower, which can meet the processing needs of flue gas wet desulfurization for units with a capacity of 50MW to 1000MW.

(4) Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is the schematic diagram that overlooks the spray layer inside the absorption tower;

Fig. 3 is a schematic diagram of the spray layer inside the absorption tower viewed from the side.

1-washing reaction tower, 2-circulating slurry tank, 3-smoke inlet pipe, 4-spray pipe, 5-smoke gas outlet, 6-anti-corrosion layer, 7-stirrer, 8-ventilation pipe, 9-main pipe, 10 -branch pipe, 11-support, 12-flange, 13-inspection hole, 14-exhaust hole.

(5) Specific implementation methods

Referring to Figure 1-3, this kind of flue gas wet desulfurization square absorption tower, the lower part of the tower body is the circulating slurry tank 2, the upper part of the tower body is the washing reaction tower 1, the cross sections of the upper part and the lower part of the tower body are both rectangular, and are connected vertically As a whole, the lower part of the upper section communicates with the smoke inlet pipe 3, and the middle part of the upper section is equipped with four layers of spray pipes 4. The spray pipe includes a main pipe 9 and branch pipes 10 branched from both sides of the main pipe. The main pipe 9 has inspection holes 13 and The exhaust hole 14, the main pipe 9 and the branch pipe 10 are connected by a flange 12, and the two ends of the branch pipe are erected on the support 11 on the wall of the absorption tower.

The tangential direction at the top of the tower body is connected to the flue gas outlet 5 . The above-mentioned tower body is made of steel or concrete structure. The insertion angle a between the smoke inlet pipe 3 and the washing reaction section is 5-15 degrees. A stirrer 7 and a ventilation pipe 8 are inserted into the lower circulation slurry tank.

The interior of the absorption tower is exposed to corrosive slurry and flue gas, and the inner wall of the tower can be lined with an anti-corrosion layer 6. The anti-corrosion layer can choose a rubber inner liner, glass flake or resin flake inner liner, and the thickness of the anti-corrosion layer is 2- 10mm, the best thickness is 5-8mm.

The present invention proposes to adopt a square or rectangular steel or concrete structure as the absorption tower for desulfurization reaction. The bottom of the tower is a circulating pulp pool, and the flue gas that needs to be desulfurized is sent to the top of the pulp pool in the tower through the flue. The flue gas washed in the tower is discharged from the upper outlet of the tower. The flue gas velocity in the tower is controlled at 3-5 m/s. The inside of the tower is generally a slightly positive pressure working environment, and the thickness of the tower body needs to be determined according to the structure of the strength calculation.

Claims (10)

1. square absorption tower for wet method desulfurization of flue gas, the tower body hypomere is the circulation stock tank, epimere is the washing reaction section, it is characterized in that: the cross section of tower body epimere and hypomere is rectangle, and vertically be connected as a single entity, the bottom of epimere is communicated with smoke-intake pipe, and the middle part of epimere is furnished with shower, the tangential direction at tower body top connects exhanst gas outlet, inner agitator and the breather pipe of inserting of hypomere circulation stock tank.

2. square absorption tower for wet method desulfurization of flue gas according to claim 1 is characterized in that: the material of above-mentioned tower body is steel or xoncrete structure.

3. square absorption tower for wet method desulfurization of flue gas according to claim 1 is characterized in that: the insertion angle of above-mentioned smoke-intake pipe and washing reaction section is the 5-15 degree.

4. square absorption tower for wet method desulfurization of flue gas according to claim 1 is characterized in that: above-mentioned according to claim 1, it is characterized in that: above-mentioned tower body inwall is lined with anticorrosive coat.

5. square absorption tower for wet method desulfurization of flue gas according to claim 4 is characterized in that: above-mentioned anticorrosive coat is rubber liner layer, resin scale or glass flake inner liner.

6. square absorption tower for wet method desulfurization of flue gas according to claim 5 is characterized in that: the thickness of above-mentioned anticorrosive coat is 2-10mm.

7. square absorption tower for wet method desulfurization of flue gas according to claim 5 is characterized in that: the thickness of above-mentioned anticorrosive coat is 5-8mm.

8. square absorption tower for wet method desulfurization of flue gas according to claim 1 and 2 is characterized in that: the flue gas flow rate in the above-mentioned tower is controlled at 3～5 meter per seconds.

9. square absorption tower for wet method desulfurization of flue gas according to claim 1 and 2 is characterized in that: above-mentioned shower is four layers.

10. square absorption tower for wet method desulfurization of flue gas according to claim 1 and 2 is characterized in that: above-mentioned shower comprises the arm of being responsible for and telling from person in charge both sides, and the arm two ends are erected on the bearing that absorbs on the Tata wall.

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