CN102794102A - Desulfurization tower equipped with gas-flow uniform-distribution plate - Google Patents

Abstract

The invention provides a desulfurization tower provided with an airflow uniform distribution plate, which belongs to the technical field of flue gas desulfurization. The desulfurization tower of the present invention includes a flue gas inlet, an evenly distributed plate, an atomized spray layer, a primary demister, a secondary demister, an upper flushing water system for the primary demister, and a lower flushing water system for the primary demister , the upper flushing water system of the secondary demister, the lower flushing water system of the secondary demister, the flue gas outlet, and the slurry pool; the flue gas inlet is set on the lower side of the desulfurization tower; the uniform distribution plate is set in the middle of the desulfurization tower and interposed Between the atomization spray layer and the flue gas inlet; the slurry pool is set at the bottom of the desulfurization tower. The evenly distributed plate is in the shape of a disc, with a number of evenly distributed circular holes on it. The diameter of the circular holes is 100-150mm, and the opening rate is 30%-40%. The method of the invention is simple, easy to operate, small in investment and remarkable in regulating effect.

Description

A desulfurization tower equipped with airflow uniform distribution plate

technical field

The invention belongs to the technical field of flue gas desulfurization, and in particular relates to a desulfurization tower provided with a plate for evenly distributing air flow.

Background technique

Due to its mature technology and high desulfurization efficiency, wet desulfurization is currently the most widely used desulfurization technology. At present, most desulfurization towers adopt the method of uniform air distribution. The inlet pipe is inclined downward at a certain angle to supply air, and the air distribution is carried out by the expansion, diffusion and inertia of the air flow itself. However, the effect of such uniform air distribution is limited. The airflow distribution in the tower is still very uneven. The local wind speed on the side of the tower wall opposite the entrance is too high, and the slurry sprayed in this part of the area has a low density and is mostly wall-adhesive flow. Therefore, SO ₂ in part of the airflow is not completely removed. At the same time, excessive local wind speed will also make the mist eliminator unable to function well, resulting in serious liquid-carrying phenomenon at the chimney outlet, which not only pollutes the surrounding environment but also wastes the absorbent.

Contents of the invention

The present invention provides a desulfurization tower equipped with airflow uniform distribution plates, the purpose of which is to solve the problem of uneven airflow distribution in the desulfurization tower and improve desulfurization and demisting efficiency.

The desulfurization tower provided by the present invention is provided with an air flow uniform distribution plate, which includes a flue gas inlet 1, a uniform distribution plate 3, an atomization spray layer 4, a primary demister 5a, a secondary demister 5b, a primary Flushing water system 6a1 for the upper demister, 6a2 for the lower rinsing water system for the primary demister, 6b1 for the upper rinsing water system for the secondary demister, 6b2 for the lower rinsing water system for the secondary demister, flue gas outlet 7, slurry pool 8 The flue gas inlet 1 is arranged on the lower side of the desulfurization tower 2; the uniform distribution plate 3 is arranged in the middle section of the desulfurization tower 2, and the uniform distribution plate 3 is interposed between the atomization spray layer 4 and the between the flue gas inlets 1; the lower flushing water system 6a2 of the primary demister, the primary demister 5a, the upper flushing water system 6a1 of the primary demister, the lower flushing water system 6b2 of the secondary demister, The secondary demister 5b, the flushing water system 6b1 on the secondary demister and the flue gas outlet 7 are sequentially arranged on the upper part of the desulfurization tower 2 from bottom to top; the slurry pool 8 is arranged at the bottom of the desulfurization tower 2 .

The uniform distribution plate 3 is disc-shaped, and there are some circular holes above the uniform distribution plate 3, and the circular holes are evenly distributed. The aperture of the circular holes is 100-150mm, and the opening of the circular holes is The rate is 30%-40%. The evenly distributed plate can choose the material that meets the requirements according to the different media in the tower. Generally, it must be corrosion-resistant and able to withstand a certain high temperature, such as alloy steel.

The working principle of the desulfurization tower provided by the present invention is: the flue gas enters the tower from the entrance, and through the regulation of the uniform distribution plate, the flue gas in the tower on the upper part of the uniform distribution device can be evenly distributed, effectively reducing the local gas velocity overshoot. The big problem is to avoid the problem of poor defogging effect caused by excessive gas velocity, improve the defogging efficiency and reduce the waste of absorption liquid. The flue gas turbulence in the lower part of the uniform distribution device becomes larger, which reduces the gas film resistance and increases the mass transfer rate. At the same time, it can effectively increase the gas-liquid contact area, prolong the gas-liquid contact time, and improve the desulfurization efficiency.

In order to solve the problem of uneven air distribution in the desulfurization tower caused by factors such as the angle and position of the flue gas inlet, an air flow uniform distribution plate is installed in the tower to make the flow field in the tower uniform, so as to improve the desulfurization efficiency and demisting efficiency , to improve the serious situation of chimney outlet with liquid.

Notable effect of the present invention:

By adding an airflow uniform distribution plate to the desulfurization tower, the airflow in the desulfurization tower can be effectively rectified, so as to obtain a uniform and relatively stable flow field, so that the gas velocity in the tower can meet the desulfurization efficiency and demisting efficiency to the maximum. The method of the invention is simple, easy to operate, small in investment and remarkable in regulating effect.

Description of drawings

Fig. 1 is a schematic diagram of the structure of a desulfurization tower provided with a gas flow uniform distribution plate according to the present invention.

In the figure: 1: flue gas inlet; 2: desulfurization tower body 2; 3: airflow uniform distribution plate; 4: atomization spray layer; 5a: primary demister; 5b: secondary demister; 6a1: one 6a2: flushing water system under the primary demister; 6b1: flushing water system above the secondary demister; 6b2: flushing water system under the secondary demister; 7: flue gas outlet ;8: Slurry pool.

Detailed ways

The invention is a device for solving uneven distribution of gas flow and excessive local gas velocity in a desulfurization tower. The air flow in the desulfurization tower is adjusted by adding an air flow uniform distribution device between the flue gas inlet and the spray layer in the desulfurization tower, so that the air flow in the tower is evenly distributed.

The desulfurization tower of the present invention includes a flue gas inlet 1, a desulfurization tower body 2, a uniform distribution plate 3, an atomization spray layer 4, a primary demister 5a, a secondary demister 5b, and a flushing water system on the primary demister 6a1, the flushing water system under the primary demister 6a2, the upper flushing water system 6b1 of the secondary demister, the flushing water system 6b2 under the secondary demister, the flue gas outlet 7, the slurry pool 8; adjust the uniform distribution of airflow The plate 3 is in the shape of a disc with a number of circular holes evenly distributed. The hole diameter is between 100-150mm and the opening rate is 30%-40%. It is located between the atomization spray layer 4 and the flue gas inlet 1. .

The flue gas enters the desulfurization tower 2 from the flue gas inlet 1, and the flue gas entering the tower is hindered by setting the airflow uniform distribution plate 3, and the turbulent degree of the flue gas at the lower part of the uniform distribution plate increases, so that the flue gas and the desulfurization liquid can be more efficiently Good contact reaction to remove SO ₂ in flue gas. The flue gas on the upper part of the uniform distribution plate passes through the forced rectification of the uniform distribution device, the air flow is evenly distributed, and fully contacts with the countercurrent desulfurization liquid to achieve the purpose of high-efficiency desulfurization. At the same time, the gas velocity is controlled at the demister Within the working range, the mist eliminator can play a good role and improve the mist removal efficiency, thereby improving the problem of liquid at the chimney outlet.

Claims (2)

1. desulfurizing tower that is provided with the airflow uniform distribution plate; It is characterized in that said desulfurizing tower (2) comprises on smoke inlet (1), uniform board (3), atomizing spray layer (4), one-level demister (5a), secondary demister (5b), the one-level demister under flushing water system (6a1), the one-level demister flushing water system (6b1) on flushing water system (6a2), the secondary demister, flushing water system (6b2), exhanst gas outlet (7), slurries pond (8) under the secondary demister; Said smoke inlet (1) is arranged on the lower side of said desulfurizing tower (2); Said uniform board (3) is arranged on the stage casing of desulfurizing tower (2), and said uniform board (3) is between said atomizing spray layer (4) and said smoke inlet (1); Under the said one-level demister on flushing water system (6a2), one-level demister (5a), the one-level demister under flushing water system (6a1), the secondary demister on flushing water system (6b2), secondary demister (5b), the secondary demister flushing water system (6b1) and exhanst gas outlet (7) be successively set on the top of desulfurizing tower (2) from bottom to up; Said slurries pond (8) is arranged on the bottom of said desulfurizing tower (2).

2. a kind of desulfurizing tower that is provided with the airflow uniform distribution plate according to claim 1; It is characterized in that said uniform board (3) is for discoid; Said uniform board has some circular openings above (3); Circular opening is evenly distributed, the aperture 100-150mm of said circular opening, the percent opening 30%-40% of said circular opening.

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