Tail gas energy-saving device

Abstract

The utility model belongs to the field of tail gas treatment, particularly relates to a tail gas energy-saving device, and provides the following scheme aiming at the problems that after tail gas in an existing washing tower is subjected to adiabatic evaporation, low-temperature water exists, the temperature is 20-25 DEG C throughout the year, the sodium hydroxide dissolving effect is reduced, crystallization is easy, a spray head is blocked, and the tail gas desulfurization effect is influenced. The mixer is used for mixing solutions; the foam tower is used for removing dust in dusty gas, the foam tower is arranged on one side of the mixer, a foam tower flue gas outlet end is arranged at the top of the foam tower, and a foam tower inlet end is arranged at the top of one side of the foam tower. Low-temperature washing liquid originally generated in the tail gas washing tower is fully utilized, so that the purification effect is improved, and meanwhile, crystals generated in the tail gas washing tower are reduced; meanwhile, the low-temperature washing liquid generated by the tail gas washing tower can also reduce the energy consumption of the foam tower, so that the energy-saving effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of tail gas treatment, in particular to a tail gas energy-saving device. Background Art

[0002] The tail gas treatment device is an indispensable device in the current social industrialization. The tail gas can be discharged only after being purified by the treatment device to avoid toxic and harmful gases polluting the environment, such as foam tower and washing tower. However, when using this device, there are still the following problems:

[0003] 1. After the flue gas is washed in the foam tower, the temperature rises, and the plate heat exchanger cools it down, which consumes a lot of energy;

[0004] 2. After the tail gas in the scrubbing tower is adiabatically evaporated, there is low-temperature water, which is at 20-25°C all year round, which reduces the dissolution effect of sodium hydroxide, makes it easy to crystallize, clog the nozzle, and affect the desulfurization effect of the tail gas. Utility Model Content

[0005] The utility model aims to solve the problems in the prior art that after the flue gas is washed in a foam tower, the temperature rises, and the heat exchange and cooling are carried out through a plate heat exchanger, which results in high energy consumption; after the tail gas in the washing tower is adiabatically evaporated, low-temperature water exists, which is at 20-25°C all year round, reducing the dissolution effect of sodium hydroxide, making it easy to crystallize and clog the nozzle, thus affecting the desulfurization effect of the tail gas; and a tail gas energy-saving device is proposed.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An exhaust gas energy-saving device includes a mixer for achieving solution mixing;

[0008] A foam tower, used to remove dust from dusty gas, the foam tower is arranged on one side of the mixer, a foam tower smoke outlet is arranged on the top of the foam tower, a foam tower inlet is arranged on the top of one side of the foam tower, and one end of the mixer is connected to the foam tower inlet through a connecting pipe, a foam tower smoke inlet is arranged on the bottom of one side of the foam tower, and a foam tower outlet is arranged on the bottom of the other side of the foam tower;

[0009] A degassing tower, used for removing sulfur dioxide from the gas, the degassing tower is arranged on one side of the foam tower, the top of the degassing tower is provided with a degassing tower outlet flue gas end, the top of one side of the degassing tower is provided with a degassing tower inlet end, the interior of the degassing tower is provided with a No. 1 spray pipe connected to the degassing tower inlet end, the bottom of one side of the degassing tower is provided with a degassing tower inlet end, and the bottom of the other side of the degassing tower is provided with a degassing tower outlet end;

[0010] A tail gas scrubber for purifying tail gas, the tail gas scrubber being arranged on one side of a degassing tower, the top of the tail gas scrubber being provided with a scrubber outlet flue gas end, the top of one side of the tail gas scrubber being provided with a scrubber inlet end, the inside of the tail gas scrubber being provided with a No. 2 spray pipe connected to the scrubber inlet end, the bottom of one side of the tail gas scrubber being provided with a scrubber outlet end, and one side of the tail gas scrubber being provided with a scrubber inlet flue gas end located between the scrubber inlet end and the scrubber outlet end;

[0011] The outlet end of the foam tower is connected to an outlet pipe No. 1, the other end of the outlet pipe No. 1 is respectively connected to a reflux pipe No. 1 and a receiving pipe No. 1, the other end of the reflux pipe No. 1 is connected to a mixer, and the other end of the receiving pipe No. 1 is connected to an inlet end of the degassing tower;

[0012] The outlet end of the degassing tower is connected to a No. 2 outlet pipe, the other end of the No. 2 outlet pipe is respectively connected to a No. 2 discharge pipe and a No. 2 receiving pipe, and the other end of the No. 2 receiving pipe is connected to the inlet end of the washing tower;

[0013] The outlet end of the washing tower is connected with a No. 3 reflux pipe, the other end of the No. 3 reflux pipe is respectively connected with a No. 2 reflux pipe and a No. 1 drain pipe, and the other end of the No. 2 reflux pipe is connected with a mixer.

[0014] In a possible design, the fume inlet end of the foam tower is connected to a dust exhaust duct.

[0015] In a possible design, the air inlet end of the degassing tower is connected to a degassing tower inlet flue gas pipe.

[0016] In a possible design, the inlet flue gas end of the scrubbing tower is connected to an inlet flue gas pipe of the scrubbing tower.

[0017] In a possible design, the other end of the No. 2 row of pipes is connected to the No. 1 liquid storage tank, and the other end of the No. 1 row of pipes is connected to the No. 2 liquid storage tank.

[0018] In a possible design, the top of the flue gas outlet of the degassing tower is connected to a truncated cone tube, a plurality of inclined baffles arranged side by side are fixedly arranged inside the truncated cone tube, a circular baffle located above the inclined baffle is arranged inside the truncated cone tube, and a plurality of through holes are opened on the circular baffle.

[0019] In the present application, when it is used specifically, the washing liquid first enters the interior of the foam tower from the inlet end of the foam tower (the dusty gas enters the interior of the foam tower through the dusty flue gas pipeline connected to the flue gas inlet end of the foam tower), and then the gas purified by the foam tower is discharged from the flue gas outlet end of the foam tower, and the liquid is discharged from the outlet end of the foam tower, and then the liquid enters the interior of the mixer and the degassing tower from the No. 1 outlet pipe through the No. 1 reflux pipe and the No. 1 receiving pipe respectively. At this time, the liquid entering the interior of the degassing tower is sprayed through the No. 1 spray pipe (the other end of the degassing tower inlet flue gas pipe connected to the air inlet end of the degassing tower is provided with a blower), and then the free dioxide in the water is blown out by wind. The sulfur is blown out and discharged through the flue gas end of the degassing tower outlet. Then the liquid is discharged from the outlet end of the degassing tower and enters the interior of the exhaust gas washing tower through the No. 2 receiving pipe, and is sprayed through the No. 2 spray pipe. Then the exhaust gas enters the interior of the exhaust gas washing tower through the inlet flue gas pipe of the washing tower and the inlet flue gas end of the washing tower. The purified exhaust gas is discharged through the outlet flue gas end of the washing tower through the exhaust gas washing tower. The liquid is discharged through the outlet end of the washing tower and enters the interior of the No. 1 discharge pipe and the No. 2 reflux pipe respectively through the No. 3 reflux pipe. At this time, the internal liquid of the No. 1 reflux pipe and the liquid inside the No. 2 reflux pipe are refluxed to the interior of the mixer, and after mixing, they enter the interior of the foam tower.

[0020] In the utility model, the exhaust gas energy-saving device can improve the dissolution effect of sodium hydroxide, reduce the crystallization and nozzle blockage, and improve the exhaust gas desulfurization effect by making full use of the low-temperature washing liquid generated inside the exhaust gas washing tower through transformation;

[0021] In the utility model, the exhaust gas energy-saving device can reduce the energy consumption of the plate heat exchanger of the original foam tower by reusing the low-temperature washing liquid in the exhaust gas washing tower and returning it to the foam tower for purification of dusty gas, thereby achieving the effects of environmental protection, energy saving and cost reduction;

[0022] In the utility model, when in use, the low-temperature washing liquid originally generated inside the tail gas washing tower is fully utilized, thereby improving the purification effect and reducing the crystallization generated inside;

[0023] At the same time, the low-temperature washing liquid produced by the tail gas washing tower can also reduce the energy consumption of the foam tower, achieving energy-saving effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the main structure of an exhaust gas energy-saving device proposed by the utility model;

[0025] Figure 2 This is a three-dimensional structural schematic diagram of a foam tower of an exhaust gas energy-saving device proposed by the utility model;

[0026] Figure 3 A three-dimensional structural schematic diagram of a degassing tower of an exhaust gas energy-saving device proposed by the utility model;

[0027] Figure 4 A three-dimensional structural schematic diagram of an exhaust gas washing tower of an exhaust gas energy-saving device proposed by the utility model;

[0028] Figure 5 The utility model is a schematic diagram of the cross-sectional structure of a truncated cone-shaped tube of an exhaust gas energy-saving device.

[0029] In the figure: 1. mixer; 2. foam tower; 3. degassing tower; 4. tail gas washing tower; 5. No. 1 reflux pipe; 6. No. 2 reflux pipe; 7. No. 1 exhaust pipe; 8. No. 3 reflux pipe; 9. No. 1 outlet pipe; 10. No. 1 receiving pipe; 11. No. 2 outlet pipe; 12. No. 2 exhaust pipe; 13. No. 2 receiving pipe; 14. foam tower inlet; 15. foam tower flue gas outlet; 16. washing tower outlet flue gas end; 17. foam tower flue gas inlet; 18. foam tower outlet; 19. degassing tower inlet; 20. washing tower inlet; 21. degassing tower air inlet; 22. degassing tower outlet; 23. degassing tower outlet flue gas end; 24. washing tower outlet; 25. washing tower inlet flue gas pipe; 26. washing tower inlet flue gas end; 27. truncated cone tube; 28. circular baffle; 29. ​​inclined baffle. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0031] Example 1

[0032] Reference Figure 1-4 , an exhaust gas energy-saving device, which is used in the field of exhaust gas treatment, comprises: a mixer 1;

[0033] A foam tower 2, a foam tower smoke outlet 15 is provided at the top of the foam tower 2, a foam tower inlet 14 is provided at the top of one side of the foam tower 2, and one end of the mixer 1 is connected to the foam tower inlet 14 through a connecting pipe, a foam tower smoke inlet 17 is provided at the bottom of one side of the foam tower 2, and the foam tower smoke inlet 17 is connected to the dust exhaust pipe, and a foam tower outlet 18 is provided at the bottom of the other side of the foam tower 2;

[0034] A degassing tower 3, wherein a degassing tower outlet flue gas end 23 is disposed at the top of the degassing tower 3, a degassing tower inlet end 19 is disposed at the top of one side of the degassing tower 3, a No. 1 spray pipe connected to the degassing tower inlet end 19 is disposed inside the degassing tower 3, a degassing tower air inlet end 21 is disposed at the bottom of one side of the degassing tower 3, the degassing tower air inlet end 21 is connected to the degassing tower inlet flue gas pipe, and a degassing tower outlet end 22 is disposed at the bottom of the other side of the degassing tower 3;

[0035] A tail gas washing tower 4, wherein a washing tower outlet flue gas end 16 is disposed at the top of the tail gas washing tower 4, a washing tower inlet end 20 is disposed at the top of one side of the tail gas washing tower 4, a No. 2 spray pipe connected to the washing tower inlet end 20 is disposed inside the tail gas washing tower 4, a washing tower outlet end 24 is disposed at the bottom of one side of the tail gas washing tower 4, a washing tower inlet flue gas end 26 located between the washing tower inlet end 20 and the washing tower outlet end 24 is disposed on one side of the tail gas washing tower 4, and the washing tower inlet flue gas end 26 is connected to a washing tower inlet flue gas pipe 25;

[0036] The foam tower outlet end 18 is connected to the No. 1 outlet pipe 9, the other end of the No. 1 outlet pipe 9 is respectively connected to the No. 1 reflux pipe 5 and the No. 1 receiving pipe 10, the other end of the No. 1 reflux pipe 5 is connected to the mixer 1, and the other end of the No. 1 receiving pipe 10 is connected to the degassing tower inlet end 19;

[0037] The outlet end 22 of the degassing tower is connected to the No. 2 outlet pipe 11, and the other end of the No. 2 outlet pipe 11 is respectively connected to the No. 2 discharge pipe 12 and the No. 2 receiving pipe 13, and the other end of the No. 2 receiving pipe 13 is connected to the inlet end 20 of the washing tower;

[0038] The outlet end 24 of the washing tower is connected to a No. 3 reflux pipe 8 , the other end of the No. 3 reflux pipe 8 is respectively connected to a No. 2 reflux pipe 6 and a No. 1 drain pipe 7 , and the other end of the No. 2 reflux pipe 6 is connected to the mixer 1 .

[0039] In the above technical scheme, when it is used specifically, the washing liquid first enters the interior of the foam tower 2 from the foam tower inlet end 14 (the dusty gas enters the interior of the foam tower 2 through the dusty flue gas pipeline connected to the fume inlet end 17 of the foam tower), and then the gas purified by the foam tower 2 is discharged from the fume outlet end 15 of the foam tower, and the liquid is discharged from the foam tower outlet end 18, and then the liquid enters the interior of the mixer 1 and the degassing tower 3 from the No. 1 outlet pipe 9 through the No. 1 reflux pipe 5 and the No. 1 receiving pipe 10 respectively. At this time, the liquid entering the interior of the degassing tower 3 is sprayed through the No. 1 spray pipe (the other end of the degassing tower inlet flue gas pipe connected to the degassing tower air inlet end 21 is provided with a blower), and then the free sulfur dioxide in the water is blown out by wind. Blow out, and discharge through the flue gas end 23 of the degassing tower outlet, then the liquid is discharged from the degassing tower outlet end 22 and enters the interior of the tail gas washing tower 4 through the No. 2 receiving pipe 13, and is sprayed through the No. 2 spray pipe, then the tail gas enters the interior of the tail gas washing tower 4 through the washing tower inlet flue gas pipe 25 and the washing tower inlet flue gas end 26, and the purified tail gas is discharged through the washing tower outlet flue gas end 16 by the tail gas washing tower 4, and the liquid is discharged through the washing tower outlet end 24, and enters the interior of the No. 1 discharge pipe 7 and the No. 2 return pipe 6 respectively through the No. 3 return pipe 8, at this time, the internal liquid of the No. 1 return pipe 5 and the liquid of the No. 2 return pipe 6 are refluxed to the interior of the mixer 1, and then enter the interior of the foam tower 2 after being mixed;

[0040] Through the transformation, the low-temperature washing liquid is fully utilized to improve the dissolution effect of sodium hydroxide, reduce crystallization and clogging of nozzles, and improve the tail gas desulfurization effect. The low-temperature washing liquid produced by the tail gas washing tower 4 can also reduce the energy consumption of the foam tower 2, achieving energy-saving effect.

[0041] Example 2

[0042] Improved on the basis of Example 1: the other end of the No. 2 row pipe 12 is connected to the No. 1 liquid storage tank, and the other end of the No. 1 row pipe 7 is connected to the No. 2 liquid storage tank;

[0043] In the above technical solution, the extra liquid is discharged through two liquid storage tanks respectively.

[0044] refer to Figure 5 The top of the flue gas end 23 of the degassing tower outlet is connected to a truncated cone-shaped tube 27, and a plurality of inclined baffles 29 arranged side by side are fixedly arranged inside the truncated cone-shaped tube 27. A circular baffle 28 located above the inclined baffle 29 is arranged inside the truncated cone-shaped tube 27, and the circular baffle 28 has a plurality of through holes.

[0045] In the above technical scheme, part of the water is prevented from being sprayed out from the flue gas end of the degassing tower outlet along with the airflow of the blower. When the air carrying a large amount of water droplets passes through the flue gas end 23 of the degassing tower outlet and enters the interior of the truncated cone tube 27, the area increases, the flow rate decreases, and the air touches the inclined baffle 29 and the circular baffle 28 to cause them to fall. In addition, the circular baffle 28 can prevent foreign matter from falling into the interior of the degassing tower. The structure is simple and has a certain protective effect.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An exhaust gas energy-saving device, characterized in that: include: A mixer (1) for mixing solutions; A foam tower (2) is used to remove dust from dusty gas, the foam tower (2) being arranged on one side of the mixer (1), the top of the foam tower (2) being provided with a foam tower smoke outlet (15), the top of one side of the foam tower (2) being provided with a foam tower inlet (14), and one end of the mixer (1) being connected to the foam tower inlet (14) via a connecting pipe, the bottom of one side of the foam tower (2) being provided with a foam tower smoke inlet (17), and the bottom of the other side of the foam tower (2) being provided with a foam tower outlet (18); A degassing tower (3) for removing sulfur dioxide from the gas, wherein the degassing tower (3) is arranged on one side of the foam tower (2), a degassing tower outlet flue gas end (23) is arranged on the top of the degassing tower (3), a degassing tower inlet end (19) is arranged on the top of one side of the degassing tower (3), a No. 1 spray pipe connected to the degassing tower inlet end (19) is arranged inside the degassing tower (3), a degassing tower air inlet end (21) is arranged on the bottom of one side of the degassing tower (3), and a degassing tower outlet end (22) is arranged on the bottom of the other side of the degassing tower (3); A tail gas scrubber (4) is used to purify tail gas. The tail gas scrubber (4) is arranged on one side of the degassing tower (3). A scrubber outlet flue gas end (16) is arranged on the top of the tail gas scrubber (4). A scrubber inlet end (20) is arranged on the top of one side of the tail gas scrubber (4). A second spray pipe connected to the scrubber inlet end (20) is arranged inside the tail gas scrubber (4). A scrubber outlet end (24) is arranged on the bottom of one side of the tail gas scrubber (4). A scrubber inlet flue gas end (26) located between the scrubber inlet end (20) and the scrubber outlet end (24) is arranged on one side of the tail gas scrubber (4). The foam tower outlet end (18) is connected to an outlet pipe (9), the other end of the outlet pipe (9) is respectively connected to a return pipe (5) and a receiving pipe (10), the other end of the return pipe (5) is connected to the mixer (1), and the other end of the receiving pipe (10) is connected to the degassing tower inlet end (19); The outlet end (22) of the degassing tower is connected to a No. 2 outlet pipe (11), the other end of the No. 2 outlet pipe (11) is respectively connected to a No. 2 discharge pipe (12) and a No. 2 receiving pipe (13), and the other end of the No. 2 receiving pipe (13) is connected to the inlet end (20) of the washing tower; The outlet end (24) of the washing tower is connected to a No. 3 reflux pipe (8), the other end of the No. 3 reflux pipe (8) is respectively connected to a No. 2 reflux pipe (6) and a No. 1 drain pipe (7), and the other end of the No. 2 reflux pipe (6) is connected to a mixer (1).

2. The exhaust gas energy saving device according to claim 1, characterized in that: The fume inlet end (17) of the foam tower is connected to a dusty tail gas pipeline.

3. The exhaust gas energy saving device according to claim 2, characterized in that: The degassing tower air inlet end (21) is connected to a degassing tower inlet flue gas pipe.

4. The exhaust gas energy-saving device according to claim 3, characterized in that: The scrubbing tower inlet flue gas end (26) is connected to a scrubbing tower inlet flue gas pipe (25).

5. The exhaust gas energy saving device according to claim 4, characterized in that: The other end of the No. 2 row pipe (12) is connected to the No. 1 liquid storage tank, and the other end of the No. 1 row pipe (7) is connected to the No. 2 liquid storage tank.

6. The exhaust gas energy saving device according to claim 1, characterized in that: The top of the flue gas outlet end (23) of the degassing tower is connected to a truncated cone-shaped tube (27), a plurality of oblique baffles (29) arranged side by side are fixedly arranged inside the truncated cone-shaped tube (27), a circular baffle (28) located above the oblique baffle (29) is arranged inside the truncated cone-shaped tube (27), and a plurality of through holes are opened on the circular baffle (28).

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