Double-circulation flue gas desulfurization and dust removal device

Abstract

The utility model relates to the technical field of flue gas desulfurization and dust removal, and discloses a double-circulation flue gas desulfurization and dust removal device which comprises a tower body, a liquid collecting tank, a first spraying area, a first demisting area, a second spraying area, a second demisting area, a collecting net, a slag outlet, an inner flow guide ring plate, a flue gas inlet pipe and a flue gas outlet. Through twice spraying of the first spraying area and the second spraying area and two-stage demisting design of the first demisting area and the second demisting area, the removal efficiency of sulfur dioxide and dust is improved, and strict environment-friendly emission standards can be met; the collecting net is arranged in the liquid collecting tank, and the slag outlet in the tower body is matched with the inlet and outlet of the collecting net, so that impurities generated in the spraying process can be conveniently collected and cleaned; and the inner flow guide ring plate accurately guides the falling liquid to the collection net, so that the impurity collection efficiency is effectively improved, impurities are prevented from entering the liquid collection tank outside the collection net, the cleanliness of the desulfurization and dust removal liquid in the liquid collection tank is ensured, the operation stability of the whole device is improved, and the service life of the whole device is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to flue gas desulfurization and dust removal technical field, concretely is a kind of double circulation flue gas desulfurization and dust removal device. BACKGROUND

[0002] With the increasingly stringent environmental protection requirements, the flue gas generated in industrial production must be effectively treated to reduce the emission of pollutants such as sulfur oxides and dust. In the existing flue gas desulfurization and dust removal technology, there are many problems. For example, the removal efficiency of pollutants in the flue gas by the traditional single-cycle desulfurization and dust removal device is limited, and it is difficult to meet the increasingly stringent environmental protection standards. Some existing double-cycle devices, such as the patent document with announcement number CN216825633U, use a three-sleeve structure of an outer sleeve, a middle sleeve and an inner sleeve, and are also equipped with an inner circulation system and an outer circulation system, which has a complex structure, resulting in increased difficulty in equipment manufacturing and higher active cost. SUMMARY

[0003] The utility model mainly provides a kind of double circulation flue gas desulfurization and dust removal device, solves the removal efficiency of pollutants in the flue gas by the traditional single-cycle device is limited, and the problem of the complex structure of double-cycle device.

[0004] To solve the above technical problems, the utility model adopts the following technical solutions:

[0005] The utility model provides a kind of double-cycle flue gas desulfurization dust removal device, including tower body, is arranged in the liquid collecting tank of the tower body bottom;The tower body is sequentially provided with first spray zone, first demisting zone, second spray zone, second demisting zone from bottom to top;First spray zone is provided with a plurality of first spray head, a plurality of first spray head is communicated with first circulation pipeline, the other end of first circulation pipeline is communicated with the liquid collecting tank;Second spray zone is provided with a plurality of second spray head, and second spray head is communicated with second circulation pipeline, and the other end of second circulation pipeline is communicated with the liquid collecting tank;First demisting zone and second demisting zone are provided with demister in;The liquid collecting tank is provided with collection net, and the tower body is provided with slag outlet that cooperates with the in-and-out of the collection net, and the tower body is provided with inner guide ring plate that cooperates with the collection net, and the discharge port of the inner guide ring plate is located in the range of the feed inlet of the collection net;It further includes that the inner guide ring plate is provided on the tower body in the position above the corresponding smoke pipe, and the flue gas outlet is opened in the top of the tower body.Specifically, the tower body is provided with the replacement pipe for replacing desulfurization dust removal liquid corresponding to the liquid collecting tank.The replacement pipe that the tower body is provided with corresponding liquid collecting tank, when needing, it is convenient to carry out integral replacement to desulfurization dust removal liquid in liquid collecting tank, when the desulfurization dust removal effect of desulfurization dust removal liquid drops or composition does not meet the requirement, can be drained by replacement pipe Old liquid and inject new liquid, ensure that device is always in the best operating state, improve the adaptability and maintenance convenience of device.Specifically, the first demisting zone can be provided with baffle demister, and the second demisting zone can be provided with wire mesh demister.Working principle: the flue gas containing sulfur dioxide and dust and other pollutants enters from the smoke pipe provided on the tower body, first in first spray zone, by first circulating pump, desulfurization dust removal liquid in the liquid collecting tank at the bottom of tower is sprayed out by first spray head and fully contacts with flue gas, carries out first desulfurization dust removal reaction, sulfur dioxide in flue gas and alkaline substance in desulfurization dust removal liquid react chemically, generate sulfite and other desulfurization products, while dust is adsorbed and settled by droplet;After being treated in first spray zone, flue gas, with part of unreacted droplet, rises to first demisting zone, and the droplet is removed by demister;After removing droplet, flue gas continues to rise in tower and enters second spray zone, by second circulating pump, desulfurization dust removal liquid in the liquid collecting tank is conveyed to second spray head by second circulation pipeline and sprayed out, carries out second desulfurization dust removal reaction to flue gas entering second spray zone, further removes pollutants in flue gas;Afterwards, flue gas rises to second demisting zone and is removed by demister after removing residual tiny droplet, and is discharged from the flue gas outlet at the top of tower;During the period, liquid formed by spraying drops in tower and is guided by inner guide ring plate, so as to accurately enter collection net, and the impurities in liquid are collected by using collection net, and only after being filtered by collection net, desulfurization dust removal liquid can be used again by first circulation pipe and second circulation pipe;When stopping, open slag outlet, and take out collection net for cleaning.Beneficial effects: 1. Through the two-time spraying of the first and second spraying zones and the two-stage mist removal design of the first and second mist removal zones, the removal efficiency of sulfur dioxide and dust in the flue gas is greatly improved, which can meet the strict environmental protection emission standard; 2. The collection net is arranged in the liquid collecting tank, and the in-out of the collection net is matched with the slag outlet on the tower body, so that the impurities generated in the spraying process can be conveniently collected and cleaned; 3. The inner guide ring plate accurately guides the descending liquid to the collection net, effectively improves the impurity collection efficiency, prevents the impurities from entering the liquid collecting tank outside the collection net, ensures the cleanliness of the desulfurization and dust removal liquid in the liquid collecting tank, and thus improves the operation stability and service life of the entire device; 4. The multi-layer structure from bottom to top is adopted, which occupies less area and has simpler structure compared with the multi-sleeve structure of the prior art.

[0006] Further, the first circulating pipeline and the second circulating pipeline have the same structure; the first circulating pipeline comprises a pipe frame fixedly connected to the tower body, a plurality of connecting ports are formed in the lower side of the pipe frame, the first spraying head is installed on the connecting port, the inlet of the pipe frame extends to the outside of the tower body and is fixedly connected with a flow guide pipe, a circulating pump is arranged on the flow guide pipe, and the other end of the flow guide pipe is communicated with the liquid collecting tank. In use, taking the first circulating pipeline as an example: after the circulating pump is started, the desulfurization and dust removal liquid in the liquid collecting tank is conveyed to the pipe frame through the flow guide pipe, and the desulfurization and dust removal liquid is uniformly sprayed out through the first spraying head connected with the connecting port on the pipe frame, so as to spray and treat the flue gas in the first spraying zone; the second circulating pipeline has the same working principle, and the desulfurization and dust removal liquid in the liquid collecting tank is conveyed to the second spraying head in the second spraying zone through the circulating pump, so as to realize the secondary spraying of the flue gas. By adopting this structure, the first circulating pipeline and the second circulating pipeline have the same structure, which greatly simplifies the design and manufacturing process of the equipment and reduces the production cost. At the same time, the standardized structure is convenient for installation and maintenance, and when a circulating pipeline fails, the maintenance personnel can quickly familiarize with its structure and perform maintenance or replacement.

[0007] Further, the outer end of the collection net is provided with a closing door for closing the slag outlet. When the device is normally operated, the closing door tightly fits the slag outlet to form a good seal, preventing the leakage of flue gas and desulfurization and dust removal liquid in the tower body and the entry of external impurities; when the collection net needs to be cleaned, the closing door is opened, and the collection net can be taken out from the inside of the tower body through the slag outlet; after cleaning, the collection net is put back into the tower body, and the closing door is closed to restore the normal operating state of the device. By adopting this structure, the closing door effectively prevents the leakage of flue gas and desulfurization and dust removal liquid, avoids pollution to the surrounding environment, ensures the stability of the air pressure in the tower body, is conducive to the flow of flue gas in the tower according to the predetermined path, improves the desulfurization and dust removal efficiency, prevents external dust, sundries and the like from entering the liquid collecting tank, avoids pollution to the desulfurization and dust removal liquid, and affects the normal operation of the device.

[0008] Further, the closed door is provided with a motor, an output end of the motor is provided with a stirring shaft, the stirring shaft extends into the collection net, and stirring blades are arranged on the stirring shaft. During operation of the device, the motor is started to drive the stirring shaft to rotate, and the stirring blades on the stirring shaft rotate in the collection net along with the rotation of the stirring shaft. With this structure, since impurities that fall during the spraying process accumulate in the collection net, the rotation of the stirring blades can stir the mixture of the impurities and the desulfurization and dust removal liquid. On the one hand, the desulfurization and dust removal liquid that has not reacted fully is further contacted with the impurities for reaction; on the other hand, the impurities are prevented from accumulating and blocking in the collection net, so that the liquid in the collection net can smoothly pass through the filter of the collection net and enter the liquid collecting tank, and the desulfurization and dust removal liquid is recycled.

[0009] Further, a telescopic pipe is arranged on the discharge port of the inner flow guide ring plate, a lifting cylinder for driving the telescopic pipe to move up and down is arranged on the lower side of the inner flow guide ring plate, and an output end of the lifting cylinder is fixedly connected with a lower end of the telescopic pipe. In use, the lifting cylinder controls the lifting of the telescopic pipe, so that the lower end of the telescopic pipe extends into the collection net. With this structure, the lifting cylinder is elongated to drive the telescopic pipe to move downward, so that the lower end of the telescopic pipe is closer to the collection net, and the liquid flowing down the inner flow guide ring plate is more accurately guided into the collection net. When the collection net needs to be cleaned or the device is in other specific working conditions, the lifting cylinder is retracted to drive the telescopic pipe to move upward, so as to leave space for the collection net to be taken out and other operations.

[0010] Beneficial effects: 1. The twice spraying of the first spraying area and the second spraying area and the two-stage demisting design of the first demisting area and the second demisting area greatly improve the removal efficiency of sulfur dioxide and dust in flue gas, and can meet strict environmental protection emission standards; 2. The collection net is arranged in the liquid collecting tank, and the in-out cooperation of the collection net and the slag discharge port on the tower body can conveniently collect and clean the impurities generated in the spraying process; 3. The inner flow guide ring plate accurately guides the falling liquid to the collection net, effectively improves the impurity collection efficiency, prevents the impurities from entering the liquid collecting tank outside the collection net, ensures the cleanliness of the desulfurization and dust removal liquid in the liquid collecting tank, and further improves the operation stability and service life of the entire device; 4. The self-bottom-to-top multi-layer structure design occupies less space and has a simpler structure compared with the multi-sleeve structure of the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a schematic view of the collection net of the embodiment;

[0012] Figure 2 It is a schematic view of the first circulation pipeline of the embodiment;

[0013] Figure 3 It is a schematic view of the second circulation pipeline of the embodiment;

[0014] Figure 4 It is a schematic view of the inner guide ring plate of the embodiment;

[0015] Figure 5 It is a schematic view of a double-circulation flue gas desulfurization and dust removal device of the embodiment;

[0016] Figure 6 It is a schematic view of the lifting cylinder of the embodiment.

[0017] The reference signs: liquid collecting tank 1, collecting net 101, closing door 102, motor 103, stirring shaft 104, stirring blade 105, first spraying area 2, first spraying head 201, pipe rack 202, first demisting area 3, demister 301, second spraying area 4, second demisting area 5, inner guide ring plate 6, flue gas inlet pipe 7, flue gas outlet 8, telescopic pipe 9, lifting cylinder 10. DETAILED DESCRIPTION

[0018] The double-circulation flue gas desulfurization and dust removal device technical scheme of the utility model will be further explained in detail in combination with the embodiment.

[0019] In the description of the utility model, it should be explained that, unless there is explicit provision and limitation, the terms "mounting", "connecting", "connection" should be understood in broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0020] As Figures 1 to 6As shown, the double-cycle flue gas desulfurization and dust removal device of the embodiment comprises a tower body, a liquid collecting tank 1 arranged at the bottom of the tower body; the tower body is sequentially provided with a first spraying zone 2, a first demisting zone 3, a second spraying zone 4 and a second demisting zone 5 from bottom to top; a plurality of first spraying heads 201 are arranged in the first spraying zone 2, a first circulating pipeline is communicated with the plurality of first spraying heads 201, and the other end of the first circulating pipeline is communicated with the liquid collecting tank 1; a plurality of second spraying heads are arranged in the second spraying zone 4, a second circulating pipeline is communicated with the second spraying heads, and the other end of the second circulating pipeline is communicated with the liquid collecting tank 1; a demisting device 301 is arranged in each of the first demisting zone 3 and the second demisting zone 5; a collecting net 101 is arranged in the liquid collecting tank 1, a slag outlet is formed in the tower body to match the in-and-out of the collecting net 101, an inner guide ring plate 6 is arranged in the tower body to match the collecting net 101, and the slag outlet of the inner guide ring plate 6 is located in the range of the feeding port of the collecting net 101; further comprising a smoke inlet pipe 7 arranged on the tower body corresponding to the position above the inner guide ring plate 6, and a flue gas outlet 8 formed in the top of the tower body. Specifically, a replacement pipe is arranged on the tower body corresponding to the liquid collecting tank 1 for replacing the desulfurization and dust removal liquid. The replacement pipe arranged on the tower body corresponding to the liquid collecting tank 1 facilitates the overall replacement of the desulfurization and dust removal liquid in the liquid collecting tank 1 when needed, and the old liquid can be discharged and the new liquid can be injected through the replacement pipe when the desulfurization and dust removal effect of the desulfurization and dust removal liquid decreases or the composition does not meet the requirements, so that the device is always in the best operating state, and the adaptability and maintenance convenience of the device are improved. Specifically, a baffle demisting device can be arranged in the first demisting zone 3, and a wire mesh demisting device can be arranged in the second demisting zone 5. The first circulating pipeline and the second circulating pipeline have the same structure; the first circulating pipeline comprises a pipe support 202 fixedly connected to the tower body, a plurality of connecting ports are formed in the lower side of the pipe support 202, the first spraying heads 201 are installed on the connecting ports, the feeding port of the pipe support 202 extends to the outside of the tower body and is fixedly connected with a flow guide pipe, a circulating pump is arranged on the flow guide pipe, and the other end of the flow guide pipe is communicated with the liquid collecting tank 1. An enclosing door 102 for enclosing the slag outlet is arranged at the outer end of the collecting net 101. An electric motor 103 is arranged on the enclosing door 102, a stirring shaft 104 is arranged at the output end of the electric motor 103, the stirring shaft 104 extends into the collecting net 101, and stirring blades 105 are arranged on the stirring shaft 104. An extension pipe 9 is arranged on the slag outlet of the inner guide ring plate 6, a lifting cylinder 10 for driving the extension pipe 9 to ascend and descend is arranged at the lower side of the inner guide ring plate 6, and the output end of the lifting cylinder 10 is fixedly connected with the lower end of the extension pipe 9. In the embodiment, as shown in Figure 3 the pipe support 202 penetrates through the tower body and is connected with the flow guide pipe arranged on the liquid collecting tank 1 on the same side, Figure 3 the flow guide pipe is only partially shown on the liquid collecting tank 1.

[0021] Working principle: the flue gas containing sulfur dioxide and dust and other pollutants enters from the smoke inlet pipe 7 arranged on the tower body, first in the first spray area 2, the desulfurization and dust removal liquid in the liquid collecting tank 1 at the bottom of the tower body is sprayed out through the first spray head 201 by the first circulating pump, fully contacts with the flue gas, and the first desulfurization and dust removal reaction is carried out, the sulfur dioxide in the flue gas reacts with the alkaline substances in the desulfurization and dust removal liquid to generate sulfite and other desulfurization products, and at the same time, the dust is adsorbed and settled by the liquid drops; the flue gas after the first spray area 2 treatment rises to the first demisting area 3 with part of the unreacted liquid drops, and the liquid drops are removed through the demister 301; the flue gas after removing the liquid drops continues to rise in the tower body and enters the second spray area 4, the desulfurization and dust removal liquid in the liquid collecting tank 1 is transported to the second spray head through the second circulating pipeline by the second circulating pump, and the second desulfurization and dust removal reaction is carried out on the flue gas entering the second spray area 4, and the pollutants in the flue gas are further removed; then, the flue gas rises to the second demisting area 5 and is removed through the demister 301, and then is discharged from the flue gas outlet 8 at the top of the tower body; during the period, the liquid formed by spraying descends in the tower body and is guided through the inner guide ring plate 6, so as to accurately enter the collecting net 101, the impurities in the liquid are collected by the collecting net 101, and only the desulfurization and dust removal liquid filtered through the collecting net 101 can be used again by the first circulating pipeline and the second circulating pipeline; when stopping, the slag outlet is opened, and the collecting net 101 is taken out for cleaning. Advantageous effects: 1. Through the two-time spraying of the first spray area and the second spray area, and the two-stage demisting design of the first demisting area and the second demisting area, the removal efficiency of sulfur dioxide and dust in the flue gas is greatly improved, and the strict environmental protection emission standard can be met; 2. The collecting net is arranged in the liquid collecting tank, and the in-out of the collecting net is matched with the slag outlet on the tower body, so that the impurities generated in the spraying process can be conveniently collected and cleaned; 3. The inner guide ring plate accurately guides the descending liquid to the collecting net, effectively improves the impurity collection efficiency, prevents the impurities from entering the liquid collecting tank outside the collecting net, ensures the cleanliness of the desulfurization and dust removal liquid in the liquid collecting tank, and further improves the operation stability and service life of the whole device; 4. The multilayer structure from bottom to top is adopted, compared with the sleeve structure of the prior art, the device occupies smaller area and has simpler structure.

[0022] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and modifications can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A dual-circulation flue gas desulfurization and dust removal device, characterized in that: The system includes a tower body and a liquid collection tank located at the bottom of the tower body. From bottom to top, the tower body is provided with a first spray zone, a first demisting zone, a second spray zone, and a second demisting zone. The first spray zone has multiple first spray heads connected to a first circulation pipe, the other end of which is connected to the liquid collection tank. The second spray zone has multiple second spray heads connected to a second circulation pipe, the other end of which is connected to the liquid collection tank. Both the first and second demisting zones are equipped with demisters. A collection net is provided in the liquid collection tank. The tower body has a slag outlet that cooperates with the collection net. An inner guide ring plate that cooperates with the collection net is provided inside the tower body, with the discharge port of the inner guide ring plate located within the feed inlet range of the collection net. The system also includes a flue gas inlet pipe located above the inner guide ring plate on the tower body and a flue gas outlet located at the top of the tower body.

2. The dual-circulation flue gas desulfurization and dust removal device according to claim 1, characterized in that: The first circulation pipe has the same structure as the second circulation pipe; the first circulation pipe includes a support pipe fixedly connected to the tower body, and multiple connection ports are opened on the lower side of the support pipe. The first spray head is installed on the connection port. The feed port of the support pipe extends to the outside of the tower body and is fixedly connected to a guide pipe. A circulation pump is installed on the guide pipe, and the other end of the guide pipe is connected to the liquid collection tank.

3. The dual-circulation flue gas desulfurization and dust removal device according to claim 1, characterized in that: The outer end of the collecting net is provided with a sealing door for closing the slag outlet.

4. The dual-circulation flue gas desulfurization and dust removal device according to claim 3, characterized in that: An electric motor is installed on the closed door, and a stirring shaft is installed at the output end of the electric motor. The stirring shaft extends into the collection net, and stirring blades are installed on the stirring shaft.

5. The dual-circulation flue gas desulfurization and dust removal device according to claim 1, characterized in that: A telescopic tube is provided on the discharge port of the inner guide ring plate, and a lifting cylinder is provided on the lower side of the inner guide ring plate to drive the telescopic tube to move up and down. The output end of the lifting cylinder is fixedly connected to the lower end of the telescopic tube.

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