CN212549036U - Sodium-alkali desulfurizing tower with porous distributor - Google Patents
Sodium-alkali desulfurizing tower with porous distributor Download PDFInfo
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- CN212549036U CN212549036U CN202020827106.XU CN202020827106U CN212549036U CN 212549036 U CN212549036 U CN 212549036U CN 202020827106 U CN202020827106 U CN 202020827106U CN 212549036 U CN212549036 U CN 212549036U
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Abstract
The utility model discloses a sodium-alkali desulfurization tower with a porous distributor. The desulfurizing tower comprises a desulfurizing tower body, a demister, a spraying layer, a porous distributor and a desulfurizing agent regeneration system; the porous distributor is arranged in the desulfurizing tower body, and is positioned below the spraying layer and above the flue gas inlet; the flue gas inlet is positioned at the lower part of the side wall of the desulfurizing tower body; the original flue gas of the boiler is connected with a flue gas inlet; a flue gas outlet is arranged at the upper end of the desulfurizing tower body; the desulfurizer regeneration system comprises a lime slurry tank, a delivery pump, a desulfurizer regeneration tank, a sedimentation tank, a desulfurization circulation tank, a circulation pump and a deslagging pump; the desulfurizer regeneration tank is connected with the lower end of the desulfurizing tower body; the desulfurizer regeneration tank is connected with the sedimentation tank; the sedimentation tank is respectively connected with a deslagging pump and a desulfurization circulating tank; the desulfurization circulating tank is connected with the spray layer; the lime slurry pool is connected with the desulfurizer regeneration pool. The utility model has the advantages of improve in the tower flue gas flow field and distribute and make it more homogenization, improve desulfurization efficiency, reduce the device energy consumption.
Description
Technical Field
The utility model relates to a sodium-alkali desulfurization tower with a porous distributor, which is suitable for the high-efficiency desulfurization of industrial boiler flue gas.
Background
At present, the treatment of smoke pollutants, particularly sulfur dioxide, discharged by combustion equipment in most countries in the world is always a key object for environmental protection. In recent years, a plurality of thermal power plants, large-scale self-contained boiler chemical plants and the like in China are provided with desulfurization systems according to regulations, so that the national treatment of air pollution obtains great effect. The existing desulphurization device has the dominant wet desulphurization in the whole flue gas desulphurization industry, and the existing desulphurization device mainly comprises a limestone-gypsum method and an ammonia method. The limestone-gypsum desulfurization process method has high initial investment, large floor area, complex system management operation and serious abrasion corrosion phenomenon, but the limestone has low price, is easy to transport and store and has high desulfurization efficiency, thereby being a wet flue gas desulfurization process preferentially selected by large-scale thermal power plants; the ammonia desulphurization process is easy to form white mist due to the volatility of ammonia, so that ammonia loss and secondary pollution are caused; it is difficult to control the crystal particle size of the product ammonium sulfate. And the sodium-alkali desulfurization is to remove sulfur dioxide in flue gas by using sodium-based alkali solution as a desulfurizing agent. The sodium-alkali desulfurization process has the advantages of large absorption capacity, high desulfurization efficiency, simple system, small occupied area, less equipment, low investment, reliable operation, higher sodium-alkali solubility, no scaling and blockage of the absorption system and the like, and is particularly suitable for flue gas desulfurization systems of small and medium boilers.
The traditional sodium-alkali desulfurization process is based on the assumption that only empty tower design is adopted, so that the cost can be saved, the treatment capacity can be improved, and the working efficiency can be improved; however, flue gas enters the desulfurizing tower, a vortex area is formed in the tower, the flow velocity of the flue gas in the tower is uneven, a downward speed is generated after part of the flue gas is limited by the tower wall, a vortex is formed near a slurry pool at the bottom of the desulfurizing tower, and the water content of the flue gas is increased due to the fact that the contact time of the backflow at the bottom and the slurry is long. Thereby lead to the flue gas temperature to reduce, not only increase the defroster burden but also form low temperature corrosion easily, produce adverse effect to the desulfurization, thereby most enterprises increase the nozzle and improve the volume of spraying in order to satisfy desulfurization efficiency, but corresponding system power consumption also increases thereupon.
Therefore, in order to overcome the prejudice of adopting an empty tower design, avoid the problem that the uneven airflow inside the desulfurizing tower has adverse effect on the desulfurization and increase the energy consumption of the system, it is necessary to develop a novel sodium-alkali desulfurization absorption tower of an industrial boiler, which can avoid the uneven airflow inside the desulfurizing tower from having adverse effect on the desulfurization.
Disclosure of Invention
The utility model aims at providing a take sodium-alkali method desulfurizing tower of porous distributor overcomes the prejudice that the tradition adopted the hollow tower design, improves flue gas flow field distribution in the sodium-alkali method desulfurization absorption tower, makes it homogenize more, improves desulfurization efficiency, reduces the device energy consumption.
In order to realize the purpose, the technical scheme of the utility model is that: a sodium-alkali desulfurization tower with a porous distributor comprises a desulfurization tower body, a demister and a spraying layer, wherein the demister and the spraying layer are both positioned in the desulfurization tower body; the demister is positioned above the spraying layer; the method is characterized in that: also comprises a porous distributor and a desulfurizer regeneration system; the porous distributor is arranged in the desulfurizing tower body, and is positioned below the spraying layer and above the flue gas inlet;
the flue gas inlet is positioned at the lower part of the side wall of the desulfurizing tower body;
the raw flue gas of the boiler is connected with the flue gas inlet; a flue gas outlet is arranged at the upper end of the desulfurizing tower body;
the desulfurizer regeneration system comprises a lime slurry tank, a delivery pump, a desulfurizer regeneration tank, a sedimentation tank, a desulfurization circulation tank, a circulation pump and a deslagging pump;
the desulfurizer regeneration tank is connected with the lower end of the desulfurizing tower body;
the desulfurizer regeneration tank is connected with the sedimentation tank;
the sedimentation tank is respectively connected with the slag removal pump and the desulfurization circulating tank;
the desulfurization circulating tank is connected with the spraying layer through a communicating pipeline; the circulating pump is arranged on the communicating pipeline;
the lime slurry tank is connected with the desulfurizer regeneration tank.
In the above technical solution, the communication duct includes a first communication duct, a second communication duct, a third communication duct, a fourth communication duct, and a fifth communication duct;
one end of the first communicating pipeline is connected to the lower end of the desulfurizing tower body, and the other end of the first communicating pipeline is connected to the upper end of the desulfurizing agent regeneration tank;
one end of the second communicating pipeline is connected to the lower part of the lime slurry pool, and the other end of the second communicating pipeline is connected to the upper part of the desulfurizer regeneration pool;
one end of a third communicating pipeline is connected to the middle part of the sedimentation tank, and the other end of the third communicating pipeline is connected to the upper part of the desulfurization circulating tank;
the slag removing pump is connected to the lower part of the sedimentation tank through a fourth communicating pipeline;
one end of a fifth communicating pipeline is connected with the lower part of the desulfurization circulating tank, and the other end of the fifth communicating pipeline is connected with the spraying layer.
In the above technical solution, the circulation pump is disposed on the fifth communication pipe;
the second communicating pipeline is provided with the delivery pump.
In the technical scheme, the spraying layer has multiple layers.
In the technical scheme, stirrers are arranged on the lime slurry tank, the desulfurizer regeneration tank and the desulfurization circulating tank.
In the technical scheme, the outlet flue gas baffle door is arranged at the flue gas outlet.
In the above technical solution, the porous distributor includes a thin plate and through holes provided on the thin plate; the thin plate is in a U-shaped structure; reinforcing ribs are provided on the side faces of the sheet.
The utility model has the advantages of as follows:
(1) the utility model adopts the porous distributor to improve the distribution of the flue gas flow field in the sodium-alkali desulfurization absorption tower, so that the flue gas flow field is more uniform, the desulfurization efficiency is improved, and the energy consumption of the device is reduced;
(2) the utility model discloses in set up porous distributor, the flue gas has strengthened the reaction time of flue gas and absorption liquid through porous distributor on the one hand, improves desulfurization efficiency, and on the other hand makes the flue gas evenly pass through the equipartition device for the flue gas obtains the distribution, and is more abundant with the absorption liquid contact that the upper spray layer sprayed, has effectively reduced liquid/gas ratio and has improved the utilization ratio of absorbent, thereby reduces flow and the energy consumption of circulating slurry pump; the problems that in the prior art, due to the fact that uneven flue gas flow inside a traditional hollow desulfurization tower has adverse effects on desulfurization effect and corrosion on a desulfurization tower body, the desulfurization efficiency is improved mainly by increasing the spraying amount, the use amount of alkali liquor is large, and the energy consumption is high are effectively solved;
(3) the utility model is suitable for the high-efficiency desulfurization of the flue gas of small and medium-sized boilers in the industry (the small and medium-sized boilers with evaporation capacity less than 75 t/h).
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of the spraying layer of the present invention having multiple layers.
Fig. 3 is a schematic sectional view of the porous distributor according to the present invention.
Fig. 4 is a rotation enlarged view of a point a in fig. 3.
Fig. 5 is a schematic perspective view of the porous distributor in fig. 3.
Fig. 6 is a front view of fig. 5.
Fig. 7 is a sectional view taken along line a-a of fig. 6.
In the figure, 1-a desulfurizing tower body, 2-a demister, 3-a spray layer, 4-a porous distributor, 4.1-a through hole, 5-a lime slurry pool, 6-a delivery pump, 7-a desulfurizing agent regeneration pool, 8-a sedimentation pool, 9-a desulfurizing circulation pool, 10-a circulating pump, 11-a stirrer, 12-raw boiler flue gas, 13-a slag removing pump, 14-a soda device, 15-clean flue gas, 16-a flue gas inlet, 17-a communicating pipeline, 17.1-a first communicating pipeline, 17.2-a second communicating pipeline, 17.3-a third communicating pipeline, 17.4-a fourth communicating pipeline, 17.5-a fifth communicating pipeline, 17.51-a spray layer communicating pipeline, 18-a flue gas outlet, 19-a desulfurizing waste liquid area and 20-an outlet flue gas baffle door, 21-reinforcing ribs.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings, which are not intended to limit the present invention, but are merely exemplary. While the advantages of the invention will be clear and readily appreciated by the description.
With reference to the accompanying drawings: a sodium-alkali desulfurization tower with a porous distributor comprises a desulfurization tower body 1, a demister 2 and a spraying layer 3, wherein the demister 2 and the spraying layer 3 are both positioned above the inside of the desulfurization tower body 1; the demister 2 is positioned above the spraying layer 3; also comprises a porous distributor 4 and a desulfurizer regeneration system 19; the porous distributor 4 is installed in the desulfurization tower body 1 and located at the middle lower part of the desulfurization tower body 1, and the porous distributor 4 is located below the spray layer 3 and above the flue gas inlet 16 (as shown in fig. 1, 2 and 3); the porous distributor mainly has the functions of improving the distribution of the flue gas flow field in the tower to make the flue gas more uniform and make the flue gas better match with the distribution of slurry in a spraying layer, the sodium-alkali desulfurization tower of the utility model is of a thin plate structure with a large number of sieve pores, under normal working condition, a layer of absorption liquid (alkali liquor) is gathered above the porous distributor, when the flue gas upwards passes through the sieve holes of the tray, the absorption liquid is closely contacted with the serous fluid flowing downwards from the sieve holes, meanwhile, the slurry foam layer with a certain height is kept on the tray, so that the collision contact between the flue gas and the liquid phase is further enhanced, on one hand, the reaction time of the flue gas and the absorption liquid is prolonged, the desulfurization efficiency is improved, on the other hand, the flue gas is uniformly distributed through the uniform distribution device, the absorption liquid sprayed by the upper spraying layer is contacted more fully, the liquid/gas ratio is effectively reduced, the utilization rate of the absorbent is improved, and therefore the flow and the power consumption of the circulating slurry pump are reduced;
the flue gas inlet 16 is positioned at the lower part of the side wall of the desulfurizing tower body 1;
the raw boiler flue gas 12 is connected with the flue gas inlet 16; a flue gas outlet 18 is arranged at the upper end of the desulfurizing tower body 1;
the desulfurizer regeneration system 19 comprises a lime slurry pool 5, a delivery pump 6, a desulfurizer regeneration pool 7, a sedimentation pool 8, a desulfurization circulation pool 9, a circulation pump 10 and a slag removal pump 13;
the desulfurizer regeneration tank 7 is connected with the lower end of the desulfurizing tower body 1;
the desulfurizer regeneration tank 7 is connected with the sedimentation tank 8;
the sedimentation tank 8 is respectively connected with the deslagging pump 13 and the desulfurization circulating tank 9, the deslagging pump 13 is connected with the lower end of the sedimentation tank 8, and the desulfurization circulating tank 9 is connected with the middle part of the sedimentation tank 8;
the desulfurization circulating tank 9 is connected with the spraying layer 3 through a communicating pipeline 17; the circulating pump 10 is arranged on the communicating pipeline 17; a soda ash device 14 is connected with the desulphurization circulating tank 9, and soda ash in the soda ash device 14 is input into the desulphurization circulating tank 9;
the lime slurry pool 5 is connected with the desulfurizer regeneration pool 7 (as shown in figures 1 and 2); the waste liquid generated after the reaction and absorption of the alkali liquor in the desulfurizer regeneration system 19 and SO2 in the flue gas enters a regeneration tank, then is reduced and regenerated with calcium hydroxide in the regeneration tank, and the regenerated sodium-based desulfurizer is pumped back to the desulfurizing tower for recycling, SO that the utilization rate of the alkali liquor is improved; the by-product generated by sodium-alkali desulphurization is calcium sulfite or calcium sulfate, and the by-product is a raw material for preparing gypsum or a novel calcium-plastic composite material prepared by processing and proportioning so as to achieve the aim of improving the reutilization of the by-product; the sodium-alkali desulphurization process reduces the investment and the operating cost, and is more suitable for the desulphurization reformation of small and medium boilers.
Further, the communication ducts 17 include a first communication duct 17.1, a second communication duct 17.2, a third communication duct 17.3, a fourth communication duct 17.4 and a fifth communication duct 17.5;
one end of the first communicating pipeline 17.1 is connected with the lower end of the desulfurizing tower body 1, and the other end is connected with the upper end of the desulfurizing agent regeneration tank 7;
one end of a second communicating pipeline 17.2 is connected with the lower part of the lime slurry pool 5, and the other end is connected with the upper part of the desulfurizer regeneration pool 7;
one end of a third communicating pipeline 17.3 is connected with the middle part of the sedimentation tank 8, and the other end is connected with the upper part of the desulfurization circulating tank 9;
the deslagging pump 13 is connected to the lower part of the sedimentation tank 8 through a fourth communicating pipeline 17.4;
one end of a fifth communicating pipeline 17.5 is connected with the lower part of the desulfurization circulating tank 9, and the other end is connected with the spraying layer 3 (as shown in figures 1 and 2).
Further, the circulation pump 10 is arranged on the fifth communication pipeline 17.5;
the second communicating pipe 17.2 is provided with the delivery pump 6 (as shown in fig. 1 and 2); the waste liquid generated after reaction and absorption of the alkali liquor and SO2 in the flue gas enters a regeneration tank, then is reduced and regenerated with calcium hydroxide in the regeneration tank, and the regenerated sodium-based desulfurizer is pumped back to the desulfurizing tower for recycling, SO that the utilization rate of the alkali liquor is improved.
Further, the spraying layer 3 has multiple layers (as shown in fig. 2); a spraying layer communication pipeline 17.51 is connected with the spraying layer 3, and a spraying layer communication pipeline 17.51 is connected with a spraying layer 3; a plurality of spraying layer communication pipelines 17.51 are connected in parallel on the fifth communication pipeline 17.5; the desulfurization efficiency is improved.
Furthermore, the lime slurry tank 5, the desulfurizer regeneration tank 7 and the desulfurization circulation tank 9 are all provided with stirrers 11 (as shown in fig. 1 and fig. 2).
Further, an outlet flue gas damper 20 is provided at the flue gas outlet 18, and the clean flue gas enters the stack for discharge through the flue gas damper 20 provided above the flue gas outlet 18.
Furthermore, the porous distributor 4 comprises a thin plate 4.2 and through holes 4.1 arranged on the thin plate 4.2; the thin plate 4.2 is in a U-shaped structure and is convenient to mount through bolts; reinforcing ribs 21 are arranged on the side surface of the thin plate 4.2, two reinforcing ribs 21 are arranged on the back surface of the thin plate 4.2 at intervals (as shown in figures 4, 5, 6 and 7), and the reinforcing ribs 21 are used for reinforcing the porous distributor 4.
The desulfurizer in the utility model refers to sodium-based alkali solution.
Examples
Use now the utility model discloses it is right to be applied to the porous distributor sodium-alkali method desulfurization of a certain middle-sized boiler flue gas for the embodiment the utility model discloses carry out the detailed description, it is right the utility model discloses be applied to the desulfurization of other industry middle-sized and small-sized boiler flue gases and have the guide effect equally.
In this embodiment, the porous distributor sodium-alkali desulfurization method includes the following steps:
(1) raw flue gas from a boiler passes through an inlet of the absorption tower, and the flue gas flows from bottom to top.
(2) When the flue gas upwards passes through the tray sieve mesh, the flue gas closely contacts with the serous fluid flowing downwards from the sieve mesh, and meanwhile, the serous fluid foam layer with a certain height is kept on the tray, so that the collision contact between the flue gas and a liquid phase is further enhanced, the reaction time of the flue gas and an absorption liquid is prolonged, and the desulfurization efficiency is improved.
(3) On the other hand, when the flue gas is uniformly distributed, the flue gas is more fully contacted with the absorption liquid sprayed by the upper spraying layer, the liquid/gas ratio is effectively reduced, the utilization rate of the absorbent is improved, and therefore the flow and the power consumption of the circulating slurry pump are reduced.
(4) The desulfurization waste liquid in the desulfurization tower enters a desulfurizer regeneration tank, and is reduced and regenerated with the calcium hydroxide solution from the lime slurry tank, and the regenerated sodium-based desulfurizer is pumped back to the desulfurization tower circulation tank for use, so that the utilization rate of alkali liquor is improved;
(5) the by-product generated by sodium-alkali desulfurization is calcium sulfite or calcium sulfate, and the by-product is a novel calcium-plastic composite material prepared from gypsum raw materials or a processing ratio, so that the aim of improving the reutilization of the by-product is fulfilled (as shown in figure 1).
And (4) conclusion: the porous distributor provided by the embodiment can be used for carrying out sodium-alkali desulphurization to improve the reaction efficiency of a desulfurizer and flue gas, effectively reduce the liquid/gas ratio and reduce the flow and power consumption of a circulating slurry pump; effectively solved because the inside flue gas air current of traditional desulfurization sky tower is uneven to the adverse effect of desulfurization effect production and to the corrosion problem of desulfurizing tower body.
Other parts not described belong to the prior art.
Claims (7)
1. A sodium-alkali desulfurization tower with a porous distributor comprises a desulfurization tower body (1), a demister (2) and a spraying layer (3), wherein the demister (2) and the spraying layer (3) are both positioned in the desulfurization tower body (1); the demister (2) is positioned above the spraying layer (3); the method is characterized in that: also comprises a porous distributor (4) and a desulfurizer regeneration system (19); the porous distributor (4) is arranged in the desulfurizing tower body (1), and the porous distributor (4) is positioned below the spraying layer (3) and above the flue gas inlet (16);
the flue gas inlet (16) is positioned at the lower part of the side wall of the desulfurizing tower body (1);
the raw boiler flue gas (12) is connected with the flue gas inlet (16); a flue gas outlet (18) is arranged at the upper end of the desulfurizing tower body (1);
the desulfurizer regeneration system (19) comprises a lime slurry pool (5), a delivery pump (6), a desulfurizer regeneration pool (7), a sedimentation pool (8), a desulfurization circulating pool (9), a circulating pump (10) and a deslagging pump (13);
the desulfurizer regeneration tank (7) is connected with the lower end of the desulfurizing tower body (1);
the desulfurizer regeneration tank (7) is connected with the sedimentation tank (8);
the sedimentation tank (8) is respectively connected with the deslagging pump (13) and the desulfurization circulating tank (9);
the desulfurization circulating tank (9) is connected with the spraying layer (3) through a communicating pipeline (17); the circulating pump (10) is arranged on the communicating pipeline (17);
the lime slurry pool (5) is connected with the desulfurizer regeneration pool (7).
2. The sodium-alkali desulfurization tower with a porous distributor according to claim 1, characterized in that: the communication pipeline (17) comprises a first communication pipeline (17.1), a second communication pipeline (17.2), a third communication pipeline (17.3), a fourth communication pipeline (17.4) and a fifth communication pipeline (17.5);
one end of the first communicating pipeline (17.1) is connected to the lower end of the desulfurizing tower body (1), and the other end is connected to the upper end of the desulfurizing agent regeneration tank (7);
one end of a second communicating pipeline (17.2) is connected with the lower part of the lime slurry pool (5), and the other end is connected with the upper part of the desulfurizer regeneration pool (7);
one end of a third communicating pipeline (17.3) is connected with the middle part of the sedimentation tank (8), and the other end is connected with the upper part of the desulfurization circulating tank (9);
the slag removing pump (13) is connected to the lower part of the sedimentation tank (8) through a fourth communicating pipeline (17.4);
one end of a fifth communicating pipeline (17.5) is connected with the lower part of the desulfurization circulating pool (9), and the other end is connected with the spraying layer (3).
3. The sodium-alkali desulfurization tower with a porous distributor according to claim 2, characterized in that: the circulating pump (10) is arranged on the fifth communicating pipeline (17.5);
the second communicating pipeline (17.2) is provided with the delivery pump (6).
4. The sodium-alkali desulfurization tower with a porous distributor according to claim 3, characterized in that: the spraying layer (3) has a plurality of layers.
5. The sodium-alkali desulfurization tower with a porous distributor according to claim 4, characterized in that: and stirrers (11) are arranged on the lime slurry tank (5), the desulfurizer regeneration tank (7) and the desulfurization circulating tank (9).
6. The sodium-alkali desulfurization tower with a porous distributor according to claim 5, characterized in that: an outlet flue gas damper door (20) is provided at the flue gas outlet (18).
7. The sodium-alkali desulfurization tower with a porous distributor according to claim 6, characterized in that: the porous distributor (4) comprises a thin plate (4.2) and through holes (4.1) arranged on the thin plate (4.2); the thin plate (4.2) is of a U-shaped structure; and reinforcing ribs (21) are arranged on the side surfaces of the thin plates (4.2).
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| CN202020827106.XU CN212549036U (en) | 2020-05-18 | 2020-05-18 | Sodium-alkali desulfurizing tower with porous distributor |
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| CN202020827106.XU CN212549036U (en) | 2020-05-18 | 2020-05-18 | Sodium-alkali desulfurizing tower with porous distributor |
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