CN204911215U - Desulfurizing tower that sprays of leading section of spraying - Google Patents

Abstract

The utility model discloses a spray desulfurization tower with a pre-spray section, which includes an absorption tower, a net flue gas outlet, a demister, a spray section, a spray section, an original flue and a slurry area are arranged sequentially from top to bottom; The spray section is divided into two design schemes: Scheme 1, the annular channel of the spray section is arranged in the absorption tower, and the atomizing nozzle is installed on the outer wall of the absorption tower and the top and the junction of the original flue and the spray section. The side wall and the bottom are louver baffle structures; plan 2, the spray section is set around the outer wall of the absorption tower, and there are several rows of atomizing nozzles distributed on the outer wall and the top wall, and the bottom is inclined toward the side of the tower wall, or it is a butterfly plate , communicate with the slurry area in the tower through the pipeline. The utility model gives full play to the advantages of the spray desulfurization technology, such as quick response, high desulfurization efficiency, easy maintenance and replacement, etc., can improve the desulfurization efficiency of the existing spray desulfurization tower, and has a simple structure, basically no supporting facilities are required for the transformation of the existing spray desulfurization tower changes.

Description

A spray desulfurization tower with a pre-spray section

technical field

The invention belongs to the field of air pollution prevention and control, in particular to a spray desulfurization tower with a pre-spray section.

Background technique

It is well known that flue gas desulfurization is an effective way to control SO ₂ pollution as well as acid rain. In the development of flue gas desulfurization technology, the spray tower is the earliest desulfurization reaction form adopted. Its advantage is that it can form a large gas-liquid contact area, and the liquid-gas ratio of the system can be small. In order to ensure a good desulfurization effect, the smaller the particle size of the droplets formed by slurry injection, the higher the desulfurization efficiency. The droplet size produced by the general spray tower is more than 1mm, and the desulfurization efficiency can reach about 95%, which can meet the 200mg/L emission standard implemented earlier. However, with the promulgation and implementation of new emission standards, it is difficult for existing desulfurization devices to meet the current national requirements for the concentration limit of sulfur dioxide emissions. In order to meet this requirement and save construction costs, the most economical approach is to The desulfurization part is undergoing efficiency improvement transformation.

In the prior art, Spray Spray Desulfurization Tower (Publication No.: 103908888A) discloses a spray spray desulfurization tower. Among them, the confluence defogging baffle is cylindrical, and there is an annular space for flue gas flow between the outside of the baffle and the spray-level tower wall. The upper part of the baffle gradually slopes toward the tower wall until the top is in contact with the tower wall. Since the bottom of the confluence baffle at the flue gas inlet end is open, the flue gas will escape near the bottom of the confluence baffle at the flue gas inlet end, and the escaped flue gas does not contact the spray droplets, so the desulfurization efficiency is low. In addition, the contact surface between the internal device and the tower wall is small, the installation is difficult, and it is difficult to promote industrialization.

Contents of the invention

Aiming at the problem of low desulfurization efficiency in the spray section in the prior art, the present invention provides a spray desulfurization tower with a pre-spray section, and the specific scheme is as follows:

A spray desulfurization tower with a pre-spray section includes an absorption tower. The absorption tower includes a net flue gas outlet, a demister, a spray section, a spray section, an original flue, and a slurry area from top to bottom.

The spray section is divided into two design schemes.

Option 1, the spray section is set above the slurry area, which is an annular channel set in the absorption tower, its entrance is connected with the original flue, the flue gas enters the spray section, and detours along the inner wall of the annular channel, and the bottom of the annular channel is a louver baffle structure. The included angle between the baffle and the vertical direction is 20-70°. In order to reduce the resistance of the baffle to the flue gas, the louver baffle is set in the direction of the airflow, that is, the upper end of the baffle is inclined toward the downstream direction of the airflow.

The annular channel of the spraying section is also characterized in that the inner wall of the channel is eccentrically designed relative to the wall of the absorption tower, and its circle center is far away from the flue gas inlet and close to the net flue gas outlet side. Due to the large amount of smoke at the entrance, the wider channel can properly reduce the smoke velocity and reduce the resistance. As the smoke cools and flows into the spray section from the bottom, the smoke volume of the annular channel gradually decreases, the channel shrinks, and the smoke The speed can be kept relatively stable and the pressure loss can be reduced to a minimum.

Atomizing nozzles are installed on the outer wall of the absorption tower and the top and side walls where the original flue and the spray section meet. After the slurry reacts with the flue gas, it flows into the slurry area from the gap between the louver baffles at the bottom.

A spray desulfurization tower with a pre-spray section, characterized in that the particle size of the slurry droplets sprayed by the atomization nozzle is less than 1mm.

Scheme 2, the spray section is set above the slurry area of the absorption tower, which is an annular channel surrounding the outside of the absorption tower, and its entrance is connected with the original flue. On the opposite side, the flue gas flows into the spray section inside the desulfurization tower from the opening on the tower wall.

Several rows of high-pressure atomizing nozzles are distributed on the outer wall and top wall of the annular channel in the spray section, spraying desulfurization slurry into the annular channel, reacting with flue gas, and removing SO ₂ . The bottom of the spray section slopes down toward the tower wall, or is a butterfly plate, and communicates with the slurry area in the tower through a pipe, and the reacted slurry returns to the slurry area.

In order to make the smoke evenly distributed in the spray section and reduce the pressure loss, an airflow distribution plate is installed at the entrance of the spray section and the corner of the smoke.

For an improved spray desulfurization tower, the technical proposal may also include: setting atomizing nozzles on the side of the tower wall above the slurry area, below the spray layer and between the spray layers, and spraying the desulfurization slurry laterally to the flue gas. Atomizing nozzles are installed on the tower wall to make up for the short-circuit of the flue gas with low coverage near the tower wall of the spray desulfurization method, which can greatly improve the desulfurization efficiency of the spray tower.

The spraying section is provided with a plurality of sets of nozzles above the slurry area to spray downwards, and the nozzles are connected to the slurry area through a pipeline provided with a circulation pump.

The present invention has the following beneficial effects: the present invention combines the spraying technology with the spraying technology, gives full play to the characteristics of the large specific surface area of the spraying desulfurization technology, responds quickly, and has high desulfurization efficiency; it can improve the desulfurization efficiency of the existing spraying desulfurization tower; There is a problem of flue gas short circuit; the nozzle can be installed sideways on the outside, which is convenient for maintenance and replacement; it is used for the transformation of the existing spray tower, with the characteristics of simple structure and convenient installation, and the pressure loss of the absorption tower is small, basically no need for changes in supporting facilities , low cost of transformation and other advantages.

Description of drawings

Figure 1 is a cross-sectional view of a spray desulfurization tower device according to Embodiment 1 of the present invention.

Among them: 1-slurry area; 2-original flue; 3-spray section; 4-louver baffle; 5-atomizing nozzle; 6-slurry circulation pump; 7-spray section; 8-demister; 9- Net flue gas outlet.

Fig. 2 is a partial view of the spray section of the spray desulfurization tower device according to the embodiment of the present invention.

Among them: 2-original flue; 3-spray section; 4-louver baffle.

Fig. 3 is a top view of the spraying section of the spray desulfurization tower device according to Embodiment 1 of the present invention.

Among them: 2-original flue; 3-spray section; 4-louver baffle; 5-atomizing nozzle; 9-clean flue gas outlet.

Fig. 4 is a cross-sectional view of a spray desulfurization tower device according to Embodiment 2 of the present invention.

Among them: 1-slurry area; 2-original flue; 3-spray section; 4-guide pipe; 5-atomizing nozzle; 6-slurry circulation pump; 7-spray section; 8-demister; 9- Net flue gas outlet; 11-air distribution plate; 12-drain pipe.

Fig. 5 is a partial view of the spray section of the spray desulfurization tower device in the second embodiment of the present invention.

Among them: 2-original flue; 3-spray section; 10-channel; 11-air distribution plate.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Embodiment 1: As shown in Figure 1 and Figure 2, a spray section 3 in the tower is set above the slurry area 1 of the desulfurization absorption tower, and an annular channel is formed by the top, inner baffles and the wall of the desulfurization tower, and a plurality of louver baffles 4 are set below the spray section 3 , Several columns of atomizing nozzles 5 are installed on the wall of the absorption tower of the spraying section 3 . Above the spray section 3 are the spray section 7 , the demister 8 and the clean flue gas outlet 9 in sequence.

The net flue gas outlet 9 is perpendicular to the direction of the original flue 2, and the inner baffle of the spray section 3 is eccentrically designed relative to the absorption tower wall, as shown in Figure 3. Reduce the pressure loss of the tower.

The flue gas to be treated enters the spray section 3 from the original flue ₂ , and reacts with the desulfurization slurry droplets sprayed by the atomizing nozzle 5 during the flow in the annular channel. It merges into the center of the absorption tower, continues upward, and reacts with the slurry in the spray section 7. The flue gas after the spraying treatment is discharged into the net flue gas outlet 9 after the mist is removed.

Since the particle size of the droplets sprayed by the spray section 3 is very small, the particle size is about 0.01-0.1mm, so the spray section 3 has a high reaction rate and desulfurization efficiency, and the louver baffle 4 can reduce the flue gas in the spray to a certain extent. The short circuit of the section 3 escapes, and the slurry of the spray section 3 can flow into the slurry area 1 through the louver baffle 4 for recycling.

After flowing through the spray section 3 of this structure, the flue gas is concentrated in the center of the desulfurization tower when it goes up, which can effectively avoid the problem of short circuit of the flue gas due to the low coverage of the spray section 7 close to the tower wall, and improve the spraying efficiency. Efficiency of segment 7.

Taking the transformation of the desulfurization device of a coal-fired boiler in a domestic power plant as an example, the 2nd, 3rd, and 4th layers of the original spray layer are retained. The desulfurization efficiency of these 3 layers is about 90% to 95%, and the 1st layer of the original spray layer is changed to the spray section. 3. The efficiency of this place can reach 50% to 80%, and the overall desulfurization efficiency can reach about 99%, meeting the emission standard of 35mg/Nm ³ .

The spraying section 7 is provided with a plurality of sets of nozzles above the slurry area 1 to spray downwards, and the nozzles are connected to the slurry area 1 through a pipeline provided with a slurry circulation pump 6 .

Embodiment 2: As shown in Fig. 4 and Fig. 5, the spray section 3 outside the tower is set above the slurry area 1 of the desulfurization absorption tower, and an annular channel is formed by the top, the outer baffle plate and the wall surface of the desulfurization tower, and the bottom is a butterfly-shaped anti-sedimentation plate, which is connected with the tower wall One end of the connection is lower than the end connected to the outer baffle, and the lowest point of the connection between the butterfly plate and the tower wall is provided with a guide pipe 12 communicating with the inside of the tower. An airflow distribution plate 11 is provided at the junction of the entrance of the spray section 3 and the original flue 2 to make the smoke distribution uniform.

Several rows of atomizing nozzles 5 are arranged on the top and outer baffles of the spray section 3 . Above the spray section 3 are the spray section 7 , the demister 8 and the clean flue gas outlet 9 in sequence.

The raw flue gas to be treated enters the annular channel of the spraying section 3 from the original flue 2, and is divided into two streams to bypass the annular flue from both sides, and react with the slurry droplets sprayed by the atomizing nozzle 5. The annular channel has a channel 10 on the tower wall on the other side opposite to the original flue 2, which communicates with the inside of the tower, where the two streams of flue gas flow into the tower and enter the spray section 7. The slurry in the spray section 3 flows back to the slurry zone 1 through the bottom guide pipe 12 .

The bottom of the spray section 3 of this structure is basically in a sealed state, and the short-circuit escape of flue gas is greatly reduced, so the spray efficiency can reach 90%, the efficiency of the spray section 7 is about 90% to 95%, and the overall efficiency can reach more than 99%. 35mg/Nm ³ emission standard.

Embodiment 3: An atomizing nozzle 5 is provided on the side of the tower wall below the spray section 7 and between the spray layers to improve the desulfurization efficiency.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (6)

1. A spray desulfurization tower with a pre-spray section, comprising an absorption tower, characterized in that: the absorption tower is followed by a clean flue gas outlet, a demister, a spray section, a spray section, and a former smoke Road and slurry area; The spray section is arranged above the slurry area, and includes an annular passage arranged in the absorption tower, the entrance of the annular passage communicates with the original flue, and the atomizing nozzle is installed on the outer wall of the absorption tower and the original flue and the original flue. The top, the side wall and the bottom of the junction of the spray section are louver baffle structures. 2. A spray desulfurization tower with a pre-spray section, comprising an absorption tower, characterized in that: the absorption tower is followed by a clean flue gas outlet, a demister, a spray section, a spray section, and a raw smoke Road and slurry area; The spray section is arranged above the slurry area and includes an annular passage surrounding the outside of the absorption tower. The entrance of the annular passage communicates with the original flue and communicates with the absorption tower through an opening on the tower wall. The outer wall There are several rows of atomizing nozzles distributed on the top wall, and the bottom is connected with the slurry area in the tower through a pipeline. 3. The spray desulfurization tower of the pre-spray section according to claim 1, characterized in that: the angle between the louver baffle and the vertical direction is 20-70°, and it is set according to the direction of the air flow, that is, the upper end of the baffle is Inclined toward the downstream direction of the airflow; the inner wall of the annular channel is eccentrically designed relative to the absorption tower wall, and its center is far away from the side of the original flue. 4. The spray desulfurization tower with the pre-spray section according to claim 2, characterized in that: an air flow distribution plate is provided at the entrance of the annular passage, and the bottom is inclined downward toward the tower wall, or is a butterfly plate. 5. The spray desulfurization tower of the pre-spray section according to claim 1 or 2, characterized in that: the particle size of the slurry droplets sprayed by the atomizing nozzle is less than 1mm. 6. The spray desulfurization tower of the pre-spray section according to claim 1 or 2, characterized in that: atomizing nozzles are arranged on the side of the tower wall above the slurry area, below the spray layer and between the spray layers, The atomizing nozzle is arranged on the tower wall.