CN101837238B - Desulfurization absorbing tower - Google Patents

Abstract

The invention discloses a desulfurization absorption tower, comprising a tower body, the top of the tower body has a net flue gas outlet and the lower part of the tower body has a mixed liquid outlet; a mixing tube, the lower end of the mixing tube and the lower part of the tower body and the upper end of the mixing tube has a flue gas inlet; and a desulfurizing agent nozzle, the desulfurizing agent nozzle is inserted into the mixing tube to inject desulfurizing agent into the mixing tube. According to the desulfurization absorption tower of the present invention, by setting the mixing tube separately from the tower body, the flue gas and the desulfurizer can be fully mixed, thereby obtaining a better desulfurization effect.

Description

Desulfurization absorption tower

technical field

The invention relates to a desulfurization device, in particular to a desulfurization absorption tower.

Background technique

In the traditional desulfurization process, the desulfurizer and flue gas are mixed in the absorption tower, the lower part of the absorption tower is provided with a flue gas inlet, and the upper part is provided with a desulfurizer inlet. The flue gas enters the absorption tower from the lower part of the absorption tower and is mixed with the desulfurizer in the absorption tower for desulfurization, and then the desulfurized net flue gas is discharged from the net flue gas outlet at the top of the absorption tower. Due to the large cross-section of the absorption tower, the mixing effect of flue gas and desulfurizer is poor, and the desulfurization effect is not good.

Contents of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present invention is to provide a desulfurization absorption tower with good mixing effect of flue gas and desulfurizer and good desulfurization effect.

A desulfurization absorption tower according to the present invention comprises a tower body, the top of the tower body has a net flue gas outlet and the bottom of the tower body has a mixed liquid outlet; a mixing tube, the lower end of the mixing tube and the tower body The lower part is connected, and the upper end of the mixing tube has a flue gas inlet; and a desulfurizing agent nozzle inserted into the mixing tube to inject desulfurizing agent into the mixing tube.

By setting the mixing tube on the tower body, since the cross section of the mixing tube is greatly reduced compared with the tower body, the flue gas and the desulfurizer can be fully mixed in the mixing tube, thereby obtaining better desulfurization effect.

In addition, the desulfurization absorption tower according to the present invention also has the following additional technical features:

The desulfurizer nozzle is inserted into the mixing tube from the flue gas inlet.

The desulfurization absorption tower further includes a flue gas pipe connected to the mixing pipe at the flue gas inlet.

The upper end surface of the mixing tube is an inclined plane, the flue gas pipe is connected to the upper end of the mixing tube obliquely, and the desulfurizing agent nozzle is vertically inserted into the mixing tube.

The mixing tube has a reduced-diameter section located below one end of the desulfurizing agent nozzle inserted into the mixing tube. By setting the reduced diameter part, the mixing effect between the flue gas and the desulfurizing agent can be further improved, and the contact between the flue gas and the desulfurizing agent can be made more fully, thereby achieving a further desulfurizing effect.

The mixing tube has an upper tapered section and a lower tapered section, wherein the reduced diameter section is connected between the upper tapered section and the lower tapered section.

The mixing tube is L-shaped.

A mist eliminator is installed in the absorption tower. The demister can be used to filter out the liquid entrained in the purified flue gas in the desulfurization absorption tower, so that the clean flue gas containing less liquid droplets is discharged from the clean flue gas outlet.

The mist eliminator includes an upper mist eliminator and a lower mist eliminator which are spaced up and down, and two layers of mist eliminators are arranged, so that the filtering effect of the liquid droplets in the purified flue gas is better.

The tower body also has an air inlet, which is higher than the lower end of the mixing tube and the outlet of the mixed liquid.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and comprehensible from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is a schematic structural view of a desulfurization absorption tower according to an embodiment of the present invention;

Figure 2 is a schematic diagram of a desulfurization system having the desulfurization absorption tower shown in Figure 1; and

Fig. 3 is a schematic diagram of another desulfurization system having the desulfurization absorption tower shown in Fig. 1 .

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

In the description of the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom" etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention. There is no requirement that the invention be constructed and operated in a particular orientation, and thus no limitation should be construed.

The following describes a desulfurization absorption tower according to an embodiment of the present invention with reference to FIG. 1 .

The desulfurization absorption tower according to the embodiment of the present invention includes a tower body 11 , a mixing pipe 12 and a desulfurizing agent nozzle 13 .

The top of the tower body 11 has a net flue gas outlet 111 , and the lower part of the tower body 11 has a mixed liquid outlet 112 . In addition, the tower body 11 also has an air inlet 115 , wherein the air inlet 115 is higher than the mixed liquid outlet 112 . In an example of the present invention, a mist eliminator is further provided in the tower body, wherein the mist eliminator includes an upper mist eliminator 113 and a lower mist eliminator 114 spaced up and down. The demister can be used to filter out the liquid entrained in the purified flue gas in the desulfurization absorption tower, so that the clean flue gas containing less liquid droplets is discharged from the clean flue gas outlet 111 . With two layers of mist eliminators, the effect of filtering out the liquid droplets in the purified flue gas is better.

There is a flue gas inlet 121 at the upper end of the mixing tube 12 . The upper end surface of the mixing tube 12 is inclined, that is, the end surface of the flue gas inlet 121 is inclined, and the flue gas enters the mixing tube from the flue gas inlet 121 . In an example of the present invention, a flue gas pipe 14 is connected at the flue gas inlet 121, and the flue gas pipe 14 is connected to the mixing pipe 12 obliquely at the flue gas inlet 121, for example, the flue gas pipe 14 is at the flue gas inlet 121. It is connected with the upper end of the mixing tube 12 to let in flue gas. Those skilled in the art can understand that the flue gas tube 14 can also be regarded as a part of the mixing tube 12 .

The desulfurizing agent nozzle 13 is vertically inserted into the mixing tube 12 , specifically, the desulfurizing agent nozzle 13 is inserted into the mixing tube 12 from the flue gas inlet 121 . A nozzle 131 is provided at the lower end of the desulfurizing agent nozzle 13 to inject desulfurizing agent (such as zinc oxide slurry) into the mixing tube 12 . In this way, the desulfurizing agent is sprayed into the mixing pipe 12 through the desulfurizing agent nozzle 13, and mixed with the flue gas to perform the desulfurization process.

The lower end of the mixing tube 12 communicates with the lower part of the tower body 11. By separating the mixing tube 12 from the tower body 11, the flue gas and the desulfurizer are mixed and contacted in the mixing tube 12 for desulfurization. Since the inner diameter of the mixing tube 12 is smaller than that of the tower body The inner diameter of the body 11, so the flue gas and the desulfurizer can be fully mixed in the mixing tube 12, so as to obtain a better desulfurization effect.

Optionally, the mixing tube 12 can be L-shaped, and one end of the horizontal tube is connected to the lower part of the tower body 11 . In an example of the present invention, the port at one end of the mixing tube 12 connected to the tower body 11 is higher than the mixed liquid outlet 112 . In addition, the lower end of the mixing tube 12 is lower than the gas inlet 115 of the tower body 11 .

The mixing tube 12 has a reduced diameter section 122 and an upper tapered section 123 and a lower tapered section 124 . Specifically, the reduced diameter section 122 is connected between the upper tapered section 123 and the lower tapered section 124 , and the reduced diameter section 122 is located below the end of the desulfurizer spray pipe 13 inserted into the mixing pipe 12 . By setting the reduced-diameter section 122, the contact between the flue gas and the desulfurizing agent can be more fully achieved, thereby achieving a further desulfurizing effect. In addition, the length of the upper tapered section 123 may be shorter than the length of the lower tapered section 124 , for example.

In addition, three manholes 116 are provided on the tower body 11 for installation of the demister and maintenance of the tower body.

The following describes a desulfurization system with a desulfurization absorption tower 1 according to an embodiment of the present invention with reference to FIG. 2 , wherein the desulfurization agent is zinc oxide slurry as an example.

The desulfurization system includes a desulfurization absorption tower 1, a booster fan 2, an oxidation slurry tank 3, a slurry circulation pump 4, a process water tank 5, a process water pump 6, a slurry storage tank 7, a slurry storage tank pump 8 and an oxidation fan 9. Wherein, the booster blower 2 is connected with the flue gas pipe 14 of the desulfurization absorption tower 1 so as to pass flue gas into the mixing pipe 12 through the flue gas pipe 14 .

The oxidation slurry tank 3 has a mixed liquid inlet 31, an air inlet 32 and a slurry outlet 33, wherein the mixed liquid inlet is connected with the mixed liquid outlet 112 of the tower body 11, so that the mixed liquid absorbed by the sulfur dioxide can be discharged from the tower body 1 to the oxidation In slurry tank 3. In addition, the oxidation slurry tank 3 also has an air outlet 35, which can be connected with the air inlet 115 on the tower body 11 of the desulfurization absorption tower 1, so that the redundant air in the oxidation slurry tank 3 is passed into the desulfurization absorption tower 1, thereby from the desulfurization. The top of the absorption tower 1 is discharged. The slurry outlet 33 may be connected with the slurry discharge pump 10 for discharging the slurry from the oxidation slurry tank 3 .

The outlet and the inlet of the slurry circulation pump 4 are respectively connected with the oxidation slurry tank 3 to form a loop with the oxidation slurry tank 3, so that the slurry circulation pump 4 extracts the mixed solution in the oxidation slurry tank 3 and sends it back to the oxidation slurry tank 3, thereby enabling Constantly stir the mixed solution in the oxidation slurry tank 3.

The process water tank 5 is connected to the oxidation slurry tank 3 through the process water pump 6 to replenish water into the oxidation slurry tank 3 . The slurry storage tank 7 is connected to the desulfurization agent nozzle 13 of the desulfurization absorption tower 1 through the slurry storage tank pump 8 , and the slurry storage tank pump 8 sends the zinc oxide slurry in the slurry storage tank 7 into the desulfurization agent nozzle 13 .

The oxidation fan 9 is connected with the oxidation slurry tank 3 to feed air into the oxidation slurry tank 3 . As mentioned above, zinc oxide slurry is mixed with flue gas, zinc oxide reacts with sulfur dioxide in the flue gas to form precipitated zinc sulfite, zinc sulfite and the remaining zinc oxide slurry are discharged into the oxidation slurry tank 3 together, and passed through the oxidation fan 9 Oxygen in the air in the oxidation slurry tank 3 reacts with zinc sulfite to generate zinc sulfate solution.

The following briefly describes the working process of the above-mentioned desulfurization system according to FIG. 2 .

The flue gas is sent into the mixing pipe 12 of the desulfurization absorption tower 1 through the booster fan 2, and mixed with the zinc oxide slurry sent into the mixing pipe 12 of the desulfurization absorption tower 1 by the slurry storage tank 7 through the slurry storage tank pump 8, and then Washing and desulfurization. The desulfurized net flue gas is discharged from the net flue gas outlet 111 of the tower body 11, and the mixed solution (including the generated ZnSO3 and the remaining zinc oxide slurry) after the zinc oxide slurry absorbs sulfur dioxide and sulfur is discharged from the mixed solution outlet of the desulfurization absorption tower 1 112 is discharged into the oxidation slurry tank 3.

Zinc sulfite in the mixed solution in the oxidation slurry tank 3 reacts with the oxygen in the air passed into the oxidation slurry tank 3 by the oxidation fan 9 to form a ZnSO solution that may contain a small amount of ZnSO3 and ZnO. The solution in the oxidation slurry tank 3 is continuously stirred by the slurry circulating pump 4 to fully mix the solution with the oxygen in the air to promote the reaction between oxygen and zinc sulfite and prevent the slurry from settling. In addition, the process water tank 4 supplies water to the oxidation slurry tank 3 through the process water pump 6 . Finally, the ZnSO4 solution is discharged from the outlet of the oxidation slurry tank 3.

Another desulfurization system having a desulfurization absorption tower 1 according to the present invention will be described below with reference to FIG. 3 . The difference between the desulfurization system shown in Fig. 3 and the desulfurization system shown in Fig. 2 mainly lies in the connection relationship between the slurry circulation pump 4, the slurry storage tank 7 and the desulfurization agent nozzle 13, so the following will focus on the description of the slurry circulation pump 4, the slurry storage tank The tank 7 and the desulfurizing agent nozzle 13, the description of other identical parts is omitted.

As shown in Figure 3, the outlet and inlet of the slurry circulation pump 4 are connected to the oxidation slurry tank 3 respectively to form a loop with the oxidation slurry tank 3, and the outlet of the slurry circulation pump 4 is also connected to the desulfurizer nozzle 13 of the tower body , to return a part of the slurry from the oxidation slurry tank 3 to the desulfurizer spray pipe 13. The inlet of the slurry circulation pump 4 is also connected to the slurry storage tank 7 through the slurry storage tank pump 8, so that the zinc oxide slurry and a part of the slurry in the slurry circulation pump 4 are sent to the desulfurizer nozzle 13, that is, the slurry storage tank 7. The zinc oxide slurry is not directly sent into the desulfurizer nozzle 13, but is first sent into the slurry circulation pump 4, and then the zinc oxide slurry is sent to the desulfurizer nozzle 13 together by the slurry circulation pump 4.

The working process of the above-mentioned desulfurization system is described according to FIG. 3 .

The flue gas is sent to the mixing pipe 12 of the desulfurization absorption tower 1 through the booster fan 2, and the slurry circulation pump 4 is sent to the zinc oxide slurry in the mixing pipe 12 of the desulfurization absorption tower 1 for mixing, and then washing and desulfurization. The desulfurized net flue gas is discharged from the net flue gas outlet 111 of the tower body 11, and the mixed solution (including the generated ZnSO3 and the remaining zinc oxide slurry) after the zinc oxide slurry absorbs sulfur dioxide is discharged from the mixed solution outlet of the desulfurization absorption tower 1 112 is discharged into the oxidation slurry pool 3.

Zinc sulfite in the mixed solution in the oxidation slurry pool 3 reacts with the oxygen in the air passed into the oxidation slurry pool 3 by the oxidation fan 9 to form a ZnSO solution that may contain a small amount of ZnSO3 and ZnO. The solution in the oxidation slurry pool 3 is continuously stirred by the slurry circulation pump 4 to fully mix the solution with the oxygen in the air to promote the reaction between oxygen and zinc sulfite. In addition, the process water tank 4 supplies water to the oxidation slurry pool 3 through the process water pump 6 . Finally, the ZnSO4 solution is discharged from the outlet of the oxidation slurry pool 3.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the invention is defined by the claims and their equivalents.

Claims (7)

1. a desulfuration absorbing tower is characterized in that, comprising:

Tower body, the bottom that the top of said tower body has clean exhanst gas outlet and said tower body has mixture export;

Mixing tube, said mixing tube are the L type, and the lower end of said mixing tube is connected with the bottom of tower body, and the upper end of said mixing tube has smoke inlet;

Desulfurizer nozzle, said desulfurizer nozzle are inserted in the mixing tube with injection desulfurization agent in mixing tube; With

Demister, said demister are located in the said absorption tower, and said demister comprises the last demister and following demister that is spaced apart between the upper and lower.

2. desulfuration absorbing tower according to claim 1 is characterized in that said desulfurizer nozzle is inserted in the mixing tube from said smoke inlet.

3. desulfuration absorbing tower according to claim 1 is characterized in that, further comprises fume pipe, and said fume pipe links to each other with said mixing tube at said smoke inlet place.

4. desulfuration absorbing tower according to claim 3 is characterized in that, the upper surface of said mixing tube is the inclined-plane, and said fume pipe links to each other with the upper end of said mixing tube obliquely, and said desulfurizer nozzle is inserted in the mixing tube vertically.

5. desulfuration absorbing tower according to claim 1 is characterized in that, said mixing tube has the undergauge section of reduced, said undergauge section be positioned at desulfurizer nozzle be inserted into mixing tube an end below.

6. desulfuration absorbing tower according to claim 5 is characterized in that, said mixing tube has upper conical section and inferior pyramidal section, and wherein said undergauge section is connected between upper conical section and the inferior pyramidal section.

7. desulfuration absorbing tower according to claim 1 is characterized in that said tower body also has air inlet, and said air inlet is higher than the lower end and the said mixture export of said mixing tube.

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