CN115624855A

CN115624855A - High-efficient desulfurizing tower

Info

Publication number: CN115624855A
Application number: CN202211317737.7A
Authority: CN
Inventors: 陈志远; 周洋; 杨志富; 管延敏; 张乐乐; 缪海瑞
Original assignee: Huige Nantong Environmental Protection Equipment Co ltd
Current assignee: Huige Nantong Environmental Protection Equipment Co ltd
Priority date: 2022-10-26
Filing date: 2022-10-26
Publication date: 2023-01-20
Anticipated expiration: 2042-10-26
Also published as: CN115624855B

Abstract

The invention relates to a high-efficiency desulfurizing tower which comprises a tank body, wherein a plurality of auxiliary mixing devices are arranged at the bottom of the inner side of the tank body close to a gas outlet, each auxiliary mixing device comprises a stirring device and a scraping device, each stirring device comprises a first rotating disc and a first driving device, a plurality of stirring rods are arranged on one side surface of the first rotating disc, which is vertical to the first rotating disc, each scraping device comprises a second rotating disc and a support, and a plurality of supporting rods are arranged on one side surface of the second rotating disc, which is vertical to the second rotating disc; a plurality of scraping rings are fixed on the supporting rod at equal intervals along the length direction, the outer sides of the scraping rings are connected with the supporting rod, the axis of each scraping ring is parallel to the supporting rod, the scraping rings are arranged at equal intervals, the scraping rings are sleeved on the stirring rod, and the scraping device rotates along with the stirring device; the stirring rod and the scraping ring slide relatively to each other to scrape crystals attached to the stirring rod; the invention can promote the slurry to oxidize the calcium sulfite, improve the dehydration performance of the slurry, effectively reduce the scale in the tank body and has better application prospect.

Description

High-efficient desulfurizing tower

Technical Field

The invention belongs to the technical field of waste gas treatment equipment, and particularly relates to a high-efficiency desulfurizing tower.

Background

With the development of society, fossil fuels such as coal and oil are increasingly consumed, combustion waste gas such as coal and oil contains a large amount of sulfur dioxide, and if the combustion waste gas is directly discharged into the atmosphere without being treated, serious pollution is caused.

The crystal that oxidation was appeared in the desulfurizing tower can be attached to the inner wall and the bottom of desulfurizing tower unavoidably, piles up the scale deposit for a long time and can cause certain influence to the normal operating of equipment, because screw, intake pipe, the thick liquid pump exit filter screen that arranges in the desulfurizing tower etc. handle the dead angle many, can't adopt simple scraping equipment to solve the scale deposit problem, need regularly carry out artifical scale removal. The invention has the application number of CN202210339415.6 and is named as a desulfurized flue gas post-treatment method, and discloses a desulfurized flue gas post-treatment device.A bottom wall cleaning mechanism is arranged, an electric telescopic rod is started to push a mounting box to reciprocate left and right in a desulfurization tower, and the mounting box moves to drive the bottom wall cleaning mechanism to scrape the bottom end of the desulfurization tower, so that crystals adhered to the bottom wall of the desulfurization tower are scraped off, the crystals are prevented from being accumulated on the bottom wall of the desulfurization tower for a long time, the bottom wall cleaning mechanism pushes sludge and impurities precipitated at the bottom of the desulfurization tower to a sewage discharge pipe in the moving process, the sewage discharge efficiency of the sewage discharge pipe is improved, the condition that the sludge at the left end of the inner wall of the desulfurization tower cannot be discharged is avoided, and the device is not suitable for the desulfurization tower with more equipment and more cleaning dead angles in the bottom of the tower; in addition, in a specific desulfurization field, such as a marine desulfurization tower, when seawater is mostly used as a lime water preparation raw material, in order to resist corrosion of the seawater, an anticorrosive coating or a corrosion-resistant material is adhered to the wall of the tower; the scraping may cause damage to the wall.

In addition, in the operation process of the desulfurizing tower, after compressed air enters slurry, the slurry is uniformly mixed under the stirring of the blades, but the influence range of the blades is limited, the uniform mixing is not sufficient, and the oxidation of calcium sulfite is not facilitated.

In addition, the dehydration of the slurry after absorption is also an important process link, taking the absorption slurry prepared by limestone as an example, when the calcium sulfate crystal is too fine, the calcium sulfate crystal cannot be dehydrated, the calcium sulfate crystal can be dehydrated and separated after growing to a certain degree, the growth of the calcium sulfate crystal is related to the temperature, the stirring speed, the supersaturation degree of calcium sulfate in the slurry, the duration and the like, the formation condition of the calcium sulfate crystal can be better monitored by a densimeter, generally, the longer the treatment time is, the higher the supersaturation degree of calcium sulfate in the slurry is, the more beneficial the generation of large-particle crystals is, but the longer the duration is, the crystal structure is possibly damaged, and the thinner the calcium sulfate crystal is caused.

In view of the above, it is desirable to provide a desulfurization tower capable of improving slurry absorption and dehydration performance and effectively reducing scaling in the tank.

Disclosure of Invention

The invention aims to provide a desulfurizing tower which can promote the oxidation of slurry to calcium sulfite, improve the dehydration performance of the slurry and effectively reduce the scale in a tank body.

In order to solve the technical problem, the invention discloses a desulfurizing tower which comprises a tank body, wherein a plurality of auxiliary mixing devices are arranged at the bottom of the inner side of the tank body, which is close to a gas outlet, and each auxiliary mixing device comprises a stirring device and a scraping device;

the scraping device comprises a second turntable and a support, wherein a plurality of support rods are arranged on one side surface of the second turntable and are perpendicular to the second turntable, the diameters of the support rods are far smaller than those of the stirring rods, a second rotating shaft is arranged at the center of the other side surface of the second turntable, and the second rotating shaft is connected with the support through a bearing; the bracket is fixed at the bottom of the inner side of the tank body;

a plurality of scraping rings are fixed on the supporting rod along the length direction at equal intervals, the outer sides of the scraping rings are connected with the supporting rod, the axis of each scraping ring is parallel to the supporting rod, the scraping rings are arranged at equal intervals, the scraping rings are sleeved on the stirring rod, and the scraping device rotates along with the stirring device; the stirring rod and the scraping ring can scrape the crystal attached on the stirring rod by generating relative sliding.

Preferably, the maximum distance of the stirring rod moving along the axial direction is not more than the distance between the two scraping rings.

Preferably, the first rotating shaft is provided with a second driving device for driving the first rotating shaft to move along the axial direction; the second driving device comprises a sliding rod and a driver, the first rotating shaft is connected with the sliding rod through one end of a joint bearing, and when the driver is started, the sliding rod is driven to move along the axial direction, so that the stirring device is driven to move, and the scraping ring and the stirring rod slide relatively.

Preferably, the driver is arranged on the outer side of the tank body, and the sliding rod penetrates through the wall of the tank body in a sealing mode.

Preferably, the scraper ring is a metal ring with the inner diameter matched with the outer diameter of the stirring rod.

Preferably, both end edges of the scraper ring are processed into sharp parts.

Preferably, a plurality of elastic scraping blades which are used for being tightly attached to the stirring rod are processed on the edges of the two ends of the scraping ring, and the curvature of the inner side surface of each elastic scraping blade is matched with the stirring rod; slits are arranged among the elastic scrapers, and the slits at the two ends of the scraping ring are arranged in a staggered manner.

Preferably, the auxiliary mixing device and the gas spraying direction are arranged at an included angle of 0-45 degrees.

Preferably, the cross-sectional shape of the stirring rod includes at least one of a circle, an ellipse, a flat shape, a regular polygon and a star shape.

Preferably, the auxiliary mixing device rotates at a high speed in the initial stage of absorbing sulfur dioxide by the slurry in the desulfurizing tower, and stirs the slurry, so that the compressed air sprayed out from the gas outlet is further mixed with the slurry, and the calcium sulfite is promoted to be oxidized to form calcium sulfate;

when the supersaturation degree of calcium sulfate in the slurry reaches 1.1-1.2, the stirring device rotates at a low speed, so that crystals are firstly generated on the surface of the stirring rod.

When the supersaturation degree of calcium sulfate in the slurry exceeds 1.2, the driver is started to scrape crystals attached to the stirring rod, and the scraped crystals are released into the slurry to continue growing; then the driver controls the stirring device to reset, the stirring device continues to rotate at a low speed, crystals continue to be generated on the stirring rod, and the driver is intermittently started during the period;

when the supersaturation degree of calcium sulfate in the slurry reaches or approaches to 1.3, more crystals are generated on the stirring rod, and the driver controls the stirring device to move back and forth so as to scrape the crystals attached to the stirring rod.

The high-efficiency desulfurizing tower at least has the following advantages:

1. in the earlier stage of sulfur dioxide absorption by the slurry in the desulfurizing tower, the stirring device rotates at a high speed, bubbles in the slurry are scattered more uniformly, so that oxygen can be mixed into the slurry more fully, the gas-liquid contact area is increased, and the oxidation efficiency is improved.

2. The stirring rod provides a larger attachment surface for the formation of crystals, so that the crystals can be formed on the stirring rod in advance, and after the crystals formed on the stirring rod and the supporting rod are scraped, the scraped crystals play a role of crystal seeds, thereby prolonging the growth time of the crystals to a certain extent and being beneficial to the formation of large-particle crystals; for the marine desulfurizing tower which adopts seawater as a raw material for preparing lime water, the seawater has more ions which can interfere the formation of crystallization, and the longer the growth time of crystals has more important function, so the method is particularly suitable for the marine desulfurizing tower.

3. Because the stirring rod provides a larger attachment surface for the formation of the crystals, the crystals are formed on the stirring rod more or preferentially, so that the scaling of the inner wall of the tank body can be reduced to a certain extent, the manual descaling period in the tank body can be prolonged, and the cost is reduced.

Drawings

FIG. 1 is a schematic diagram of a high-efficiency desulfurization tower.

Fig. 2 shows a schematic view of the stirring device of fig. 1 in translation scraping off crystals on a stirring rod.

Fig. 3 shows a schematic view of a pair of stirring rods and a support rod.

Fig. 4 shows a schematic illustration of a scraper ring.

Fig. 5 shows a schematic view of another scraper ring.

The reference numbers in the figures are: 1-tank body, 2-auxiliary blending device, 3-stirring device, 31-first rotating disc, 32-first driving device, 33-stirring rod, 34-first rotating shaft, 35-gear, 36-joint bearing, 4-scraping device, 41-second rotating disc, 42-bracket, 43-supporting rod, 44-second rotating shaft, 45-scraping ring, 451-sharp part, 452-elastic scraping blade, 453-slit, 5-second driving device, 51-sliding rod and 52-driver.

Detailed Description

The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.

It will be understood that terms such as "having," "including," and "comprising," when used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

Example 1

As shown in fig. 1-4, a desulfurizing tower comprises a tank body 1, a plurality of auxiliary mixing devices 2 are arranged at the bottom of the inner side of the tank body near a gas outlet, each auxiliary mixing device comprises a stirring device 3 and a scraping device 4, each stirring device comprises a first rotating disc 31 and a first driving device 32, a plurality of stirring rods 33 are arranged on one side surface of each first rotating disc 31, which is perpendicular to the first rotating disc, a first rotating shaft 34 is arranged at the center of the other side surface of each first rotating disc 31, and the first rotating shaft is in transmission connection with the first driving device 32 through a gear 35; the length of the gear on the first rotating shaft 34 is not less than the maximum distance that the first rotating shaft can move along the axial direction, so that the first driving device can always keep transmission connection with the first rotating shaft when the first rotating shaft 34 moves.

As shown in fig. 1, the scraping device includes a second turntable 41 and a support 42, a plurality of support rods 43 are disposed on one side of the second turntable 41 perpendicular to the second turntable, the diameter (or surface area) of each support rod 43 is much smaller than that of the stirring rod 33 to reduce the adhesion of the crystal on the support rod, a second rotating shaft 44 is disposed at the center of the other side of the second turntable 41, and the second rotating shaft is connected to the support 42 through a bearing; the bracket is fixed at the bottom of the inner side of the tank body;

as shown in fig. 3, a plurality of scraping rings 45 are fixed on the supporting rod along the length direction at equal intervals, the outer side of the scraping ring 45 is connected with the supporting rod, the axis of the scraping ring 45 is parallel to the supporting rod, the plurality of scraping rings 45 are arranged at equal intervals, the scraping ring 45 is sleeved on the stirring rod 33, and the scraping device rotates along with the stirring device; the stirring rod 33 and the scraping ring are relatively slid to scrape the crystal attached on the stirring rod 33.

The maximum distance of the stirring rod 33 moving along the axial direction is not more than the distance between the two scraping rings.

As shown in fig. 2, a second driving device 5 for driving the first rotating shaft to move along the axial direction is arranged on the first rotating shaft 34; the second driving device 5 comprises a sliding rod 51 and a driver 52, one end of the first rotating shaft 34 is connected with the sliding rod 51 through a joint bearing 36, and when the driver 52 is started, the sliding rod is driven to move along the axial direction, so that the stirring device is driven to move, and the scraping ring and the stirring rod slide relatively.

The driver 52 is arranged on the outer side of the tank body, the sliding rod 51 penetrates through the wall of the tank body in a sealing mode, and the driver can be an electric cylinder or an air cylinder.

The scraping ring is a metal ring with the inner diameter matched with the outer diameter of the stirring rod.

As shown in fig. 4, both end edges of the scraper ring are processed into sharp portions 451.

The auxiliary mixing device and the gas spraying direction are arranged at an included angle of 0-45 degrees. The auxiliary mixing device is preferably located right in front of the gas outlet, but this is not favorable for the arrangement of propellers and the like, and considering that one end of the auxiliary mixing device needs to be connected with the tank wall, the auxiliary mixing device and the gas spraying direction form an included angle of 0-45 degrees, in the embodiment, the auxiliary mixing device is arranged along the radial direction of the tank bottom.

The cross-sectional shape of the stirring rod 33 at least comprises one of a circle, an ellipse, a flat shape, a regular polygon and a star shape (or a quincunx shape), so that the stirring rod 33 has a larger surface area.

The auxiliary mixing device 1 rotates at a high speed in the initial stage of absorbing sulfur dioxide by the slurry in the desulfurizing tower, stirs the slurry, further mixes the compressed air sprayed out from the gas outlet with the slurry, and promotes the calcium sulfite to be oxidized to form calcium sulfate; supplementary mixing device is high-speed rotatory, and stirring rod 33 can play the whipping effect of similar egg beater, further shears the bubble that compressed air formed and refines, increases the area of contact of thick liquid and air, improves oxidation efficiency, and simultaneously, supplementary mixing device high-speed rotation in earlier stage also can reduce the scale deposit of department such as scraping ring, first carousel, second carousel, bracing piece on supplementary mixing device to a certain extent.

When the supersaturation degree of calcium sulfate in the slurry reaches 1.1-1.2, the stirring device rotates at a low speed, so that crystals are firstly generated on the surface of the stirring rod. Research shows that when the monomer can be combined with the wall of the container under certain conditions, the wall of the container can promote the growth of crystal nuclei, obviously, the wall of the container can be preferentially attached with crystals, but the wall of the container is difficult to process, and the auxiliary mixing device is arranged to play a role in replacing and attaching the crystals, so that more crystals are attached to the stirring rod, and the scaling condition of the inner wall of the tank body is reduced.

When the supersaturation degree of calcium sulfate in the slurry exceeds 1.2, the driver 52 is started to scrape the crystals attached to the stirring rod 33, and the scraped crystals are released into the slurry to continue growing; then the driver 52 controls the stirring device to reset, the stirring device 3 continues to rotate at a low speed, crystals continue to be generated on the stirring rod, and the driver is intermittently started during the period; in practice, it is possible that large crystals grow and small crystals dissolve in the slurry, and larger crystals scraped from the stirring rod facilitate the growth of the crystals.

When the supersaturation degree of calcium sulfate in the slurry reaches or approaches 1.3, more crystals are generated on the stirring rod 33, and the driver 52 controls the stirring device 3 to reciprocate to scrape the crystals attached on the stirring rod 33. In the embodiment, the supersaturation degrees 1.1-1.2, 1.2 and 1.3 are only reference critical values, and in the specific application, the time when more crystals appear in the slurry is greatly related to the temperature and the like, so the operation rhythm of the auxiliary blending device is properly adjusted according to the temperature and the specific process for preparing the raw materials for lime water and the like, and a better use effect is achieved.

In addition, when discharging the slurry in the tank body, the auxiliary kneading device 2 can be controlled to rotate at a high speed for a short time to stir up more impurities such as sludge deposited at the bottom of the tank and discharge the sludge.

Example 2

As shown in fig. 5, similar to embodiment 1, it is different in that a plurality of elastic blades 452 are formed at the edges of both ends of the scraping ring 45 for being tightly attached to the stirring rod, the elastic blades are integrally formed with the scraping ring 45, and the curvature of the inner side of the elastic blades is adapted to the stirring rod 33; the elastic scraping piece can be tightly attached to the stirring rod, and is favorable for scraping crystals on the stirring rod. Slits 453 are formed among the elastic scraping blades, crystals at the slits are difficult to scrape, the slits 453 at the two ends of the scraping ring are arranged in a staggered mode, and the elastic scraping blades on one side can make up the scraping dead angle of the slits among the elastic scraping blades on the other side.

While embodiments of the invention have been described above, it is not intended to be limited to the details shown, particular embodiments, but rather to those skilled in the art, and it is to be understood that the invention is capable of numerous modifications and that various changes may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.

Claims

1. A high-efficiency desulfurizing tower is characterized by comprising a tank body, wherein a plurality of auxiliary mixing devices are arranged at the bottom of the inner side of the tank body close to a gas outlet, each auxiliary mixing device comprises a stirring device and a scraping device, each stirring device comprises a first rotating disc and a first driving device, a plurality of stirring rods are arranged on one side surface of each first rotating disc, which is perpendicular to the first rotating disc, a first rotating shaft is arranged at the center of the other side surface of each first rotating disc, and the first rotating shaft is in transmission connection with the first driving device through a gear or a chain;

the scraping device comprises a second turntable and a support, wherein a plurality of support rods are arranged on one side surface of the second turntable, which is perpendicular to the second turntable, the diameter of each support rod is far smaller than that of each stirring rod, a second rotating shaft is arranged at the center of the other side surface of the second turntable, and the second rotating shaft is connected with the support through a bearing; the bracket is fixed at the bottom of the inner side of the tank body;

2. The high efficiency desulfurization tower of claim 1, wherein the maximum distance that the stirring rod moves in the axial direction is not greater than the distance between the scraper rings.

3. The high-efficiency desulfurization tower according to claim 2, wherein the first rotating shaft is provided with a second driving device for driving the first rotating shaft to move along the axial direction; the second driving device comprises a sliding rod and a driver, one end of the first rotating shaft is connected with the sliding rod through a joint bearing, and when the driver is started, the sliding rod is driven to move along the axial direction, so that the stirring device is driven to move, and the scraping ring and the stirring rod slide relatively.

4. The high efficiency desulfurization tower of claim 3, wherein the driver is disposed outside the tank, and the sliding rod is sealed through the wall of the tank.

5. The high efficiency desulfurization tower of claim 1, wherein the scraper ring is a metal ring having an inner diameter adapted to an outer diameter of the stirring rod.

6. The tower of claim 5, wherein the scraper ring has sharp edges at both ends.

7. The high-efficiency desulfurizing tower according to claim 5, wherein a plurality of elastic scraping blades for clinging to the stirring rod are processed at the edges of the two ends of the scraping ring, and the curvature of the inner side surface of each elastic scraping blade is matched with that of the stirring rod; slits are arranged among the elastic scrapers, and the slits at the two ends of the scraping ring are arranged in a staggered manner.

8. The efficient desulfurizing tower of claim 1, wherein the auxiliary mixing device is arranged at an angle of 0-45 degrees with the gas spraying direction.

9. The high efficiency desulfurization tower of claim 1, wherein the cross-sectional shape of the stirring rod comprises at least one of a circle, an ellipse, a flat, a regular polygon, and a star.

10. The efficient desulfurizing tower of claim 1, wherein the auxiliary mixing device rotates at a high speed in the initial stage of sulfur dioxide absorption by the slurry in the desulfurizing tower to whip the slurry, so that the compressed air sprayed from the gas outlet is further mixed with the slurry to promote the oxidation of calcium sulfite to form calcium sulfate;

when the supersaturation degree of calcium sulfate in the slurry reaches 1.1-1.2, the stirring device rotates at a low speed, so that crystals are generated on the surface of the stirring rod first;

when the supersaturation degree of calcium sulfate in the slurry exceeds 1.2, the driver is started to scrape off crystals attached to the stirring rod, and the scraped crystals are released into the slurry to continue growing; then the driver controls the stirring device to reset, the stirring device continues to rotate at a low speed, crystals continue to be generated on the stirring rod, and the driver is intermittently started during the period;