CN107213703B - Efficient desulfurizing tower - Google Patents

Abstract

The invention relates to the technical field of environmental protection equipment, in particular to a high-efficiency desulfurization tower, which includes a tower body, a smoke outlet is provided on the top of the tower body, a multi-stage spraying system is provided in the tower body, and a plurality of Mist and dust collectors, multiple fog and dust collectors are set in parallel or in series, and there is also a smoke outlet for fog and dust collectors in the tower body. Both mouth demist and dust collectors include a shell, and the upper and bottom ends of the shell are respectively provided with swirl plates. The swirl plates include swirl blades. The swirl blades of the two swirl plates rotate in opposite directions. Connected to a fume cleaner. The invention has simple structure and high water mist removal rate.

Description

Efficient desulfurization tower

technical field

The invention relates to the technical field of environmental protection equipment, in particular to a high-efficiency desulfurization tower.

Background technique

The desulfurization tower is an equipment for desulfurization treatment of industrial waste gas. It is an important equipment in chemical equipment. The desulfurization tower is a kind of desulfurization equipment with high desulfurization efficiency and low pressure loss, which can also remove dust.

After years of improvement, the desulfurization tower has developed into various types of desulfurization towers such as spray type, Venturi type, swirl plate type, swirl column type, floating ball type, sieve plate type, and pneumatic emulsification type. Mature.

The spray type desulfurization tower is one of the most widely used types of desulfurization towers. It uses alkaline liquid as a carrier to separate and treat harmful substances such as dust, sulfur dioxide, and hydrocarbons in the flue gas from the flue gas, absorb and settle them, and finally To achieve the purpose of purifying flue gas. The spray desulfurization tower has the advantages of simple structure, mature and reliable technology, and is widely used in large power plants, small and medium-sized low-sulfur flue gas treatment; for high-sulfur flue gas treatment, the non-ferrous industry uses pneumatic emulsification desulfurization towers, multi-layer spray towers, etc. Mainly.

Among them, the desulfurization tower generates a large amount of mist droplets during operation, and the large amount of water mist also contains dust particles, which affects the normal operation of the tower. Most of the fog and dust removal devices in the prior art adopt an open structure. When in use, the upper part of the fog and dust removal device is provided with spray water, and the spray water flows downward to affect the defogging effect.

The gas in the desulfurization tower flows upwards and finally reaches the top of the tower to be discharged. In order to meet environmental protection requirements, it is necessary to remove solid particles or other impurities in the gas and then purify the discharge.

In the prior art, baffles are mostly used for gas purification and demisting, but the baffles have a low purification rate, complex structure, and inconvenient installation and maintenance.

In addition, the sprayed liquid in the desulfurization tower will gather and flow to the collection device through the circulating pipeline. The circulating slurry after spraying contains a large amount of particles such as calcium carbonate, magnesium sulfate, calcium sulfate and other solid impurities. The circulating slurry flows During the process, the above-mentioned particles and solid impurities will scratch the inside of the pipeline and reduce the life of the pipeline. In addition, the circulating slurry also contains a certain amount of acid gas, which will have a certain corrosion effect on the pipeline. In the prior art, most of the pipes are protected by lining them with plastic and rubber, but the effect is not significant, the service life of the pipes is low, and the use and maintenance costs of the desulfurization tower are increased.

There are some acid gases inside the desulfurization tower, which have a corrosive effect on the facilities in the spray tower and reduce the service life of the facilities in the desulfurization tower. Among them, the spray liquid pipeline is the most installed equipment in the desulfurization tower, and the outer wall of the pipeline is easily corroded by acidic substances. The liquid in the spray pipe is a circulating liquid, and there may be some solid impurity particles in it. When the liquid flows, it will scratch the inner wall of the pipe, thus affecting the service life of the pipe.

The tower body of the desulfurization tower is mostly made of glass flakes, and the glass flakes are prone to cracking and falling off after a long time, which will have a negative impact on the use of the desulfurization tower. In addition, there may be some solid impurity particles inside the desulfurization tower. When the liquid flows, it will scratch the inner wall of the desulfurization tower, thus affecting its service life.

Contents of the invention

In order to solve the above problems, the present invention provides a high-efficiency desulfurization tower, which has a stable structure, long service life, good fog and dust removal effects, and significantly improved purification efficiency.

The present invention adopts following technical scheme:

A high-efficiency desulfurization tower, including a tower body, a smoke outlet is arranged on the top of the tower body, a multi-stage spraying system is arranged inside the tower body, a plurality of fog and dust collectors are arranged at the lower part of each stage of the spray system, and a plurality of fog and dust removal devices in parallel or in series. There is also a fog and dust collector at the smoke outlet in the tower body, and the fog and dust collector at the smoke outlet is set near the smoke outlet.

Both the fog and dust collector and the smoke outlet fog and dust collector include a shell. The upper and bottom ends of the shell are respectively equipped with swirl plates. The swirl plates include swirl blades. The swirl blades of the two swirl plates rotate in opposite directions. , the structure of opposite rotation can further promote the swirl effect. A water return port is provided on one side of the bottom end of the housing. The water mist rotates in the shell and flows upwards. During the rotation process, it is thrown to the inner wall of the shell, and the water droplets gather on the inner wall of the shell to form a water flow, which flows to the lower water return port, and enters the desulfurization tower from the return water port.

A top cover is arranged on the top of the housing, the upper surface of the top cover is a spherical curved surface, and the spherical curved surface is concave downward. The demist and dust remover is set at the lower part of the spray head. In order to prevent the spray liquid from entering the shell, a top cover is provided on the top of the shell. There is a certain gap between the top cover and the shell to facilitate the entry of air and balance the air pressure. The upper surface of the top cover is a spherical curved surface, the spherical curved surface is concave downward, and the spherical surface can effectively relieve the splashing of the spray liquid.

A soot purifier is connected to the smoke outlet, and the soot purifier includes a purification cylinder with multi-stage swirl plates inside the purification cylinder, and an ash outlet on the lower side wall of the purification cylinder. The gas enters from the lower part of the purification cylinder, and after passing through the swirling flow plate, it enters the purification cylinder in the form of a swirling flow. The particulate impurities and water mist in the gas are thrown to the inner wall of the purification cylinder due to the swirling flow and accumulate. The mist falls to the lower part of the purification cylinder and flows out from the ash outlet.

The lower part of the top cover is a conical connection part, the conical connection part is connected to the support column, and the support column is connected to the shell. The conical structure of the conical connection part can make the gas sent out by the upper swirl plate be sent out naturally along the conical surface , to ensure the swirl effect.

The casing opening between the casing and the top cover of the demist and dust remover is provided with a water retaining groove, the diameter of the casing at the water retaining groove is smaller than the diameter of the lower casing, and the water blocking groove can prevent the spray liquid falling from the top cover from entering case. Four diversion grooves are arranged on the upper surface of the top cover, and the four diversion grooves are symmetrical in pairs, and the diversion grooves guide the spray liquid received on the top cover to flow down. According to actual requirements, multiple diversion grooves can be provided.

A water retaining ring is provided at the upper end of the housing opening of the mist and dust remover at the smoke outlet, and the water retaining ring is circular. In order to prevent the mist in the shell from splashing and flowing out, a water retaining ring is provided at the opening of the shell.

The inner circulation pipeline of the desulfurization tower is arranged in the tower body, and the pipe wall of the inner circulation pipeline includes a strengthening layer, an anti-corrosion layer and a wear-resistant layer arranged in sequence from the outside to the inside. The reinforcement layer is the main support structure of the internal circulation pipeline; the anti-corrosion layer prevents the acid gas from corroding the internal circulation pipeline; the wear-resistant layer has high hardness and prevents solid particles and impurities such as calcium carbonate, magnesium sulfate, and calcium sulfate scratched.

The wear-resistant layer is made of silicon carbide or corundum. The hardness of the above-mentioned materials is greater than that of calcium carbonate, magnesium sulfate, calcium sulfate and other particles, which can effectively prevent scratches on the inner wall of the pipeline and improve the wear resistance of the pipeline; the anti-corrosion layer adopts FRP material, FRP material is fiberglass, FRP material is lightweight, corrosion-resistant, anti-aging, high mechanical strength, and can prevent acid gas from penetrating out and corroding the external reinforcement layer; the reinforcement layer is made of stainless steel, and the reinforcement layer can effectively support the pipeline as a whole. Enhance the structural stability of the pipeline.

The spraying system includes a bracket, a spraying head and a spraying liquid pipe, and the pipe wall of the spraying liquid pipe includes a first anti-corrosion layer, a structural layer, a second anti-corrosion layer and a wear-resistant layer arranged in sequence from outside to inside. The first anti-corrosion layer can prevent the corrosion of the pipeline by the acid gas outside the spray liquid pipeline and in the desulfurization tower; the structural layer is the main support structure of the spray liquid pipeline; the second anti-corrosion layer can prevent the acidic substances inside the spray liquid pipeline Corrosive effect on the spray liquid pipe; the wear-resistant layer can prevent the solid impurity particles from scratching the spray liquid pipe.

Both the first anti-corrosion layer and the second anti-corrosion layer are made of FRP, the wear-resistant layer is made of silicon carbide, and the structural layer is made of stainless steel.

The spray liquid pipeline is supported by a bracket, the spray liquid pipeline is connected to a spray head, and the spray head is arranged at the lower part of the support, and the liquid sprayed by the spray head avoids the support to slow down the corrosion of the support.

The inner side of the tower wall of the tower body is successively provided with a primer layer, an intermediate interlayer, and a wear-resistant layer. The intermediate layer adopts a multi-layer glass fiber grid cloth to press and cover an appropriate amount of glass flake cement on the primer layer.

The wear-resistant layer is made of silicon carbide or corundum, and the interlayer uses 4-5 layers of glass fiber grid cloth to press and cover an appropriate amount of glass flake cement on the primer layer. The glass flake cement of the interlayer includes vinyl Resin, glass flakes.

Advantage of the present invention and beneficial effect are:

The invention has simple structure and high water mist removal rate. During the running test, 19.72KG of water was used to form water mist, and the wind speed was 14 m/s. After being processed by the demister and dust remover of the utility model, the utility model can collect 14.474KG of water, that is, remove 14.474KG of water in the desulfurization tower. KG of water, the removal rate reaches 73.4%; under the above conditions, when the feeding wind speed is set to 8 m/s, the water mist removal rate is greater than 80%. It can be seen that the utility model can improve the working efficiency of the desulfurization tower, and can play the role of dust removal in the work of demisting.

In addition, in actual use, the thickness of the water film on the inner wall of the housing of the demister and deduster reaches 2mm, and the thickness of the water film in the prior art basically reaches 1mm. It can be seen that the structure of the utility model is beneficial to the collection of water mist.

For the same desulfurization tower, using the demisters of the prior art, the desulfurization tower needs to be equipped with 17 layers of demisters. The space in the desulfurization tower is saved, and the manufacturing cost of the desulfurization tower is reduced.

The invention can effectively prevent the acid gas from corroding the internal circulation pipeline, the tower body and the spraying system, and effectively prevent solid particles from scratching the pipeline, thereby improving the service life of the pipeline and reducing the use cost of the pipeline in the desulfurization tower as a whole.

The invention can improve the service life of the desulfurization tower and prolong the service life of the desulfurization tower to more than 6 years.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the structure schematic drawing of demister deduster;

Fig. 3 is a sectional view of Fig. 2;

Fig. 4 is the top view of Fig. 2;

Fig. 5 is the structural representation of swirl plate;

Fig. 6 is the structural representation of smoke outlet demister dust remover;

Fig. 7 is a sectional view of Fig. 6;

Fig. 8 is a structural schematic diagram of an internal circulation pipeline;

Fig. 9 is a structural schematic diagram of a spray liquid pipeline;

Figure 10 is a structural schematic diagram of the tower body.

Among them, 1-smoke and dust purifier, 2-tower body, 21-tower wall, 22-undercoat, 23-intermediate layer, 24-wear-resistant layer, 3-mist and dust collector at the smoke outlet, 4-spray head , 5-fog removal dust collector, 6-inner circulation pipeline, 61-strengthening layer, 62-anti-corrosion layer, 63-wear-resistant layer, 7-bracket, 8-spray head, 9-spray liquid pipe, 91- First anti-corrosion layer, 92-structural layer, 93-second anti-corrosion layer, 94-wear-resistant layer, 10-swirl plate, 11-water retaining ring, 12-top cover, 13-tapered connection, 14-stop Sink, 15-housing, 16-guiding tank, 17-swirling vane, 18-return port.

Detailed ways

As shown in Figures 1 to 7, a high-efficiency desulfurization tower includes a tower body 2, the top of the tower body 2 is provided with a smoke outlet, and the tower body 2 is provided with a multi-stage spraying system, and the lower part of each stage of the spraying system is provided. There are multiple fog and dust collectors 5, and multiple fog and dust collectors 5 are arranged in parallel. The tower body 2 is also provided with a smoke outlet demist and dust collector 3, which is arranged near the smoke outlet.

The structures of the demist and dust remover 5 and the smoke outlet demist and dust remover 3 all include a housing 15, the upper end and the bottom of the housing 15 are respectively provided with a swirl plate 10, and the swirl plate 10 includes a swirl blade 17, two swirl plates The rotation direction of the swirl vanes of the plate 10 is opposite. A water return port 18 is provided on one side of the bottom end of the casing 15 . The top of the casing 15 is provided with a top cover 12, the upper surface of the top cover 12 is a spherical curved surface, and the spherical curved surface is concave downward. The lower part of the top cover 12 is a conical connection part 13 , the conical connection part 13 is connected to the support column, and the support column is connected to the housing 15 .

As shown in Fig. 3 and Fig. 4, a water retaining groove 14 is provided at the housing opening between the housing and the top cover of the mist and dust remover 5, and the diameter of the housing at the water retaining groove 14 is smaller than that of the lower housing. The upper surface of the top cover 12 is provided with four diversion grooves 16, and the four diversion grooves 16 are symmetrical in pairs.

As shown in FIG. 7 , a water retaining ring 11 is provided at the upper end of the shell opening of the smoke outlet mist and dust remover 3 , and the water retaining ring 11 is circular.

The smoke outlet is connected with a smoke and dust purifier 1, and the smoke and dust purifier 1 includes a purification cylinder with a multi-stage swirl plate 10 inside the purification cylinder, and an ash outlet on the lower side wall of the purification cylinder.

As shown in Figures 1 and 8, the desulfurization tower internal circulation pipeline 6 is arranged inside the tower body 2, and the pipe wall of the internal circulation pipeline 6 includes a reinforcement layer 61, an anti-corrosion layer 62, a wear-resistant Layer 63. The wear-resistant layer 63 is made of silicon carbide; the anti-corrosion layer 62 is made of FRP; the reinforcing layer 61 is made of stainless steel.

As shown in FIG. 1 and FIG. 9 , the spraying system includes a bracket 7 , a spraying head 8 and a spraying liquid pipeline 9 . The pipe wall of the spray liquid pipeline 9 includes a first anti-corrosion layer 91 , a structural layer 92 , a second anti-corrosion layer 93 and a wear-resistant layer 94 arranged in sequence from outside to inside. Both the first anti-corrosion layer 91 and the second anti-corrosion layer 93 are made of FRP, the wear-resistant layer 94 is made of silicon carbide, and the structural layer 92 is made of stainless steel.

The spray liquid pipeline 9 is supported by the bracket 7 , the spray liquid pipeline 9 is connected to the spray head 8 , and the spray head 8 is arranged at the lower part of the support 7 .

As shown in FIG. 1 and FIG. 10 , the inner side of the tower wall 21 of the tower body 2 is provided with a primer layer 22 , an intermediate layer 23 , and a wear-resistant layer 24 in sequence. The wear-resistant layer 24 is made of silicon carbide; the intermediate interlayer 23 is made of four layers of glass fiber grid cloth to press and cover an appropriate amount of glass flake cement on the primer layer 22, and the glass flake cement of the intermediate interlayer 23 includes vinyl Resin, glass flakes.

Claims (6)

1. A high-efficiency desulfurization tower, including a tower body, the top of the tower body is provided with a smoke outlet, and the tower body is provided with a multi-stage spraying system, which is characterized in that the lower part of each stage of the spraying system is provided with multiple mist and dust collectors , a plurality of demist and dust collectors are set in parallel or in series, and there is also a demist and dust collector at the smoke outlet in the tower. The device includes a shell, the upper end and the bottom end of the shell are respectively provided with swirl plates, the swirl plates include swirl blades, the swirl blades of the two swirl plates rotate in opposite directions, and the bottom end of the shell is provided with a water return port , the top of the shell is provided with a top cover, the upper surface of the top cover is a spherical curved surface, and the spherical curved surface is concave downward. The smoke outlet is connected to a smoke dust purifier, which includes a purification cylinder. The flow plate, the lower side wall of the purification cylinder is provided with an ash outlet, The inner circulation pipeline of the desulfurization tower is arranged in the tower body, and the pipe wall of the inner circulation pipeline includes a reinforcement layer, an anti-corrosion layer, and a wear-resistant layer arranged sequentially from the outside to the inside. The wear-resistant layer is made of silicon carbide or corundum, the anti-corrosion layer is made of FRP, and the reinforcement layer is made of stainless steel. The spray system includes a bracket, a spray head and a spray liquid pipe, and the pipe wall of the spray liquid pipe includes a first anti-corrosion layer, a structural layer, a second anti-corrosion layer and a wear-resistant layer arranged in sequence from outside to inside, Both the first anti-corrosion layer and the second anti-corrosion layer are made of FRP, the wear-resistant layer is made of silicon carbide, and the structural layer is made of stainless steel. 2. The high-efficiency desulfurization tower according to claim 1, characterized in that, the lower part of the top cover is a conical connection part, the conical connection part is connected to a support column, and the support column is connected to the shell. 3. The high-efficiency desulfurization tower according to claim 2, characterized in that a water retaining groove is provided at the housing opening between the housing and the top cover of the mist and dust remover, and the diameter of the housing at the water retaining groove is smaller than that of the lower part The diameter of the shell, and the upper surface of the top cover are provided with four diversion grooves, and the four diversion grooves are symmetrical in pairs. 4. The high-efficiency desulfurization tower according to claim 2, characterized in that a water retaining ring is provided at the upper end of the housing opening of the mist and dust remover at the smoke outlet, and the water retaining ring is circular. 5. The high-efficiency desulfurization tower according to claim 1, characterized in that, the inner side of the tower wall of the tower body is successively provided with a primer layer, an intermediate interlayer, and a wear-resistant layer, and the intermediate interlayer adopts a multi-layer glass fiber grid cloth to An appropriate amount of glass flake cement is pressed and covered on the base coat. 6. The high-efficiency desulfurization tower according to claim 5, characterized in that, the wear-resistant layer is made of silicon carbide or corundum, and the middle interlayer is covered with 4-5 layers of glass fiber grid cloth to cover an appropriate amount of glass flake cement On the primer layer, the glass flake cement of the interlayer includes vinyl resin and glass flakes.