CN216964130U - Wet desulphurization tower - Google Patents

Abstract

The utility model relates to a wet desulphurization tower, which comprises a tower body, wherein a first demister and a first spray nozzle for spraying NaOH liquid drops are arranged in the tower body, the first spray nozzle is externally connected with a supply device for supplying NaOH solution, a packing layer and a second spray nozzle for spraying process water to the packing layer are also arranged in the tower body, and flue gas sequentially flows through the packing layer and the first demister in the tower body. It is through the salt fog drop that contains that reduces in the flue gas to and reduce the salinity concentration in the salt fog drop, thereby reduce the salinity of flue gas, improve the desalination effect of tower body to the flue gas.

Description

Wet desulfurization tower

Technical Field

The utility model relates to the field of wet desulphurization, in particular to a wet desulphurization tower.

Background

In the wet desulfurization process, flue gas containing SO2 is generally input into a wet tower, droplets containing NaOH are sprayed into the wet tower, and the droplets react with SO2 in the flue gas to generate mist droplets containing Na2SO3 (hereinafter referred to as salt-containing mist droplets). Then, a part of the salt-containing fog drops flow out along with the flue gas, and in the process of purifying the flue gas, the salt-containing fog drops improve the salt content in the flue gas, so that the complexity of the flue gas treatment process is increased.

In order to reduce the salt content in the flue gas, the method generally adopted at present is to install a demister in a wet tower, and when the flue gas passes through the demister, the demister can remove salt-containing fog drops in a part of the flue gas, so that the salt content in the flue gas is reduced. But a part of salt-containing fog drops with small diameter can pass through the demister, so that the desalting effect of the tower body on the flue gas is poor.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned shortcomings of the prior art, it is an object of the present invention to provide a wet desulfurization tower that solves one or more problems of the prior art.

In order to achieve the purpose, the technical scheme of the utility model is as follows:

the utility model provides a wet flue gas desulfurization tower, includes the tower body, be equipped with first defroster in the tower body and be used for spraying the first shower nozzle of NaOH liquid drop, first shower nozzle is external to have the feeding mechanism who is used for supplying NaOH solution, still be equipped with the packing layer in the tower body and to the packing layer sprays the second shower nozzle of technology water, the flue gas is in flow through in proper order in the tower body the packing layer with first defroster.

Further, still be equipped with the second defroster in the tower body, the flue gas is in flow through in the tower body in proper order the second defroster with the packing layer, the second defroster be located the packing layer with between the first shower nozzle.

Further, the first demister and the second demister are baffle-type demisters.

Furthermore, the air inlet of the tower body is lower than the air outlet of the tower body.

Further, the wet flue gas desulfurization tower still includes the pump body, the input of the pump body with the tower body inside wall intercommunication, the output of the pump body with first shower nozzle intercommunication.

Furthermore, a pipe body is arranged between the first spray head and the supply device and communicated with the first spray head, and the pipe body is provided with a one-way valve.

Furthermore, a plurality of groups of first nozzles are arranged in the tower body, the first nozzles of different groups are communicated with the pipe body arranged between the supply devices, and the pipe body is provided with a first valve.

Furthermore, a plurality of groups of first spray heads are arranged along the axial direction of the tower body.

Further, the bottom end of the side wall of the tower body is also communicated with a liquid discharge pipe, and the liquid discharge pipe is provided with a second valve.

Furthermore, a manhole is arranged on the side face of the tower body.

Compared with the prior art, the utility model has the following beneficial technical effects:

(one) flue gas flows through packing layer and first defroster in proper order in the tower body, and the second shower nozzle is used for spraying process water to the packing layer, when the flue gas passes through the packing layer, partly contain salt droplet can be attached to at the packing layer, remaining salt droplet that contains in the flue gas then can mix with process water, reduce the salinity in the salt droplet, when the flue gas flows through first defroster afterwards, the salt droplet that contains of the low salinity concentration of carrying still can be collected partly by first defroster to further reduce the salinity of flue gas, improve the desalination effect of tower body to the flue gas.

(II) the second defroster is arranged in tentatively detaching the salt fog drop in the flue gas, and the flue gas that has afterwards contains salt fog drop passes through packing layer and first defroster again to reduce the salt content in the flue gas.

And thirdly, a part of the NaOH liquid drops sprayed by the first spray head do not react with SO2 in the flue gas, namely, the NaOH liquid drops fall to the bottom of the tower body, and the pump body can be used for pumping the mixed solution (mainly containing NaOH and Na2SO3) accumulated at the bottom of the tower body to the first spray head again and sprinkling the mixed solution, SO that the utilization rate of the NaOH solution is improved.

And (IV) the pipe body is provided with a one-way valve, so that the mixed solution pumped by the pump body can be prevented from flowing back to the supply device.

And (V) after the solution at the bottom of the tower body is extracted by the pump body for a long time and is reused, the content of the NaOH solution in the solution is gradually reduced, and the solution accumulated at the bottom of the tower body can be discharged by using a liquid discharge pipe.

Drawings

Fig. 1 shows a schematic structural diagram of a wet desulfurization tower in an embodiment of the present invention.

In the drawings, the reference numbers:

1. a tower body; 11. a first demister; 12. a filler layer; 121. a second nozzle; 13. a second demister; 14. a first nozzle; 2. a pipe body; 21. a first valve; 22. a one-way valve; 3. a pump body; 31. a liquid outlet pipe; 32. a branch pipe; 4. a liquid discharge pipe; 41. a second valve; 5. a manhole.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, a wet desulfurization tower according to the present invention will be described in detail with reference to the accompanying drawings and embodiments. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise scale for the purpose of facilitating and distinctly aiding in the description of the embodiments of the present invention. To make the objects, features and advantages of the present invention comprehensible, reference is made to the accompanying drawings. It should be understood that the structures, ratios, sizes, etc. shown in the drawings and attached to the description are only for understanding and reading the disclosure of the present disclosure, and are not for limiting the scope of the present disclosure, so they do not have the essential meaning in the art, and any modifications of the structures, changes of the ratio relationships, or adjustments of the sizes, should fall within the scope of the present disclosure without affecting the efficacy and the achievable purpose of the present disclosure.

Examples

Referring to fig. 1, the present application provides a wet desulfurization tower, which includes a tower body 1, an air inlet of the tower body 1 is formed in a side wall, and an air outlet of the tower body 1 is formed in a top end of the tower body 1. The tower body 1 is internally provided with a first demister 11 and a first spray head 14, and the first spray head 14 is externally connected with a supply device (not shown) for supplying NaOH solution. When the supply device operates, NaOH liquid drops can be sprayed into the tower body 1, a packing layer 12 and a second spray head 121 are further installed in the tower body 1, in this embodiment, the second spray head 121 points to the packing layer 12 and is used for spraying process water to the packing layer 12, and the first spray head 14, the packing layer 12 and the first demister 11 are sequentially arranged along the vertical upward direction.

When carrying out wet flue gas desulfurization, the flue gas flows through first shower nozzle 14 in proper order in tower body 1, packing layer 12 and first defroster 11, first shower nozzle 14 sprays the NaOH liquid drop, take place the reaction with SO2 in the flue gas, form and contain salt droplet, the flue gas that has salt droplet afterwards passes through packing layer 12, contain salt droplet in the flue gas can with the process water intensive mixing, thereby reduce the salinity concentration in containing salt droplet, collect some salt droplet at packing layer 12 simultaneously, then the flue gas flows through first defroster 11, the salt droplet that contains of some low salinity concentration that carries in the flue gas is detached to first defroster 11, thereby reduce the salinity content of flue gas.

Further, still install second defroster 13 in tower body 1, second defroster 13 is installed between first shower nozzle 14 and packing layer 12. In this embodiment, two first demisters 11 are installed, one second demister 13 is installed, and the first demisters 11 and the second demisters 13 are baffle-type demisters.

Specifically, three groups of first spray heads 14 are provided, the three groups of first spray heads 14 are uniformly arranged along the vertical direction, and a pipe body 2 is arranged between each first spray head 14 and the supply device. A first valve 21 is installed on each pipe body 2, the first valve 21 is used for controlling the on-off of the pipe bodies 2, and the number of groups of the first spray heads 14 can be changed by controlling the on-off of the pipe bodies 2. If the number of the working groups of the first spray nozzles 14 is increased, the smoke can be sprayed for many times when flowing, so that the smoke can conveniently react with NaOH in the solution, but the pressure at each spray nozzle can be reduced, the solution is not favorably changed into liquid drops with smaller diameters, the utilization rate of the NaOH in the solution is reduced, and the number of the first spray nozzles 14 can be adjusted according to needs during actual use.

Further, wet flue gas desulfurization tower still includes the pump body 3 that sets up outside tower body 1, and the input and the inside wall intercommunication of tower body 1 of pump body 3 are used for absorbing the mixed solution (mainly containing NaOH, Na2SO3) that the tower body 1 bottom is accumulational, and the output intercommunication of pump body 3 has drain pipe 31, and drain pipe 31 has three branch pipe 32 through connecting the intercommunication, and every branch pipe 32 communicates with a body 2 respectively to spill the mixed solution pump sending to first shower nozzle 14, thereby reuse the NaOH in the mixed solution. In addition, in order to prevent the mixed solution from flowing backward to the supply means, each pipe body 2 is further provided with a check valve 22, and a connection point of the branch pipe 32 to the pipe body 2 is located between the first valve 21 and the check valve 22.

Further, the bottom end of the side wall of the tower body 1 is also communicated with a liquid discharge pipe 4, and the liquid discharge pipe 4 is provided with a second valve 41. When the mixed solution accumulated at the bottom of the tower body 1 is reused for many times, the content of NaOH in the mixed solution gradually decreases, and the value of reuse is lost, that is, the mixed solution needs to be discharged through the liquid discharge pipe 4.

In addition, a manhole 5 for installing filler is arranged on the side surface of the tower body 1, and workers can conveniently maintain or replace the structure in the tower body 1 through the manhole 5.

The working principle is as follows:

the flue gas firstly passes through a first spray nozzle 14 in the tower body 1, a part of NaOH liquid drops sprayed by the first spray nozzle 14 react with SO2 in the flue gas to form salt-containing fog drops, and then the flue gas passes through a second demister 13 to primarily remove a part of the salt-containing fog drops; then the flue gas flows through packing layer 12 and first defroster 11 in proper order, second shower nozzle 121 sprays the process water to packing layer 12, when the flue gas passes through packing layer 12, partly contain salt droplet and can attach to packing layer 12, remaining in the flue gas contain salt droplet then can mix with the process water, reduce the salinity in containing salt droplet, when the flue gas flows through first defroster 11, the salt droplet that contains of the low salinity concentration of carrying still can be collected partly by first defroster 11, thereby further reduce the salinity of flue gas, improve the desalination effect of tower body 1 to the flue gas.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims (9)

1. The utility model provides a wet flue gas desulfurization tower, includes the tower body, be equipped with first defroster in the tower body and be used for spraying the first shower nozzle of NaOH liquid drop, first shower nozzle is external to have the feeding mechanism who is used for supplying NaOH solution, its characterized in that: a packing layer and a second spray head for spraying process water to the packing layer are also arranged in the tower body, and flue gas sequentially flows through the packing layer and the first demister in the tower body; the tower body is internally provided with a second demister, smoke flows through the second demister and the packing layer in the tower body in sequence, and the second demister is positioned between the packing layer and the first spray nozzle.

2. The wet desulfurization tower of claim 1, wherein: the first demister and the second demister are baffle-type demisters.

3. The wet desulfurization tower of claim 1, wherein: the air inlet of the tower body is lower than the air outlet of the tower body.

4. A wet desulfurization tower according to claim 3, wherein: the wet desulphurization tower further comprises a pump body, the input end of the pump body is communicated with the inner side wall of the tower body, and the output end of the pump body is communicated with the first spray head.

5. The wet desulfurization tower of claim 4, wherein: and a pipe body is arranged between the first spray head and the supply device and is communicated with the supply device, and the pipe body is provided with a one-way valve.

6. The wet desulfurization tower of claim 5, wherein: the tower body is internally provided with a plurality of groups of first spray heads, different groups of first spray heads are communicated with the pipe body arranged between the supply devices, and the pipe body is provided with a first valve.

7. The wet desulfurization tower of claim 6, wherein: and the multiple groups of first spray heads are arranged along the axis direction of the tower body.

8. A wet desulfurization tower according to claim 3, wherein: the bottom end of the side wall of the tower body is also communicated with a liquid discharge pipe, and the liquid discharge pipe is provided with a second valve.

9. The wet desulfurization tower of claim 1, wherein: a manhole is arranged on the side face of the tower body.

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