Desulfurization absorption tower

• US 10,618,001 B2
• Filed: 09/10/2019
• Issued: 04/14/2020
• Est. Priority Date: 07/03/2017
• Status: Active Grant

• Current Assignee: Jiangnan Environmental Protection Group Inc.
• Original Assignee: Jiangnan Environmental Protection Group Inc.
• Inventors: Luo, Jing, Zhang, Congzhi, Luo, Yongying
• Primary Examiner(s): Holecek, Cabrena
• Application Number:
  US16/565,768
• Publication Number:
  US 20200001235A1
• Time in Patent Office: 217 Days
• CPC Class Codes: B01D 2252/10 Inorganic absorbents chemical reactants B01D2251/00
• CPC Class Codes: B01D 2252/102 Ammonia
• CPC Class Codes: B01D 2257/302 Sulfur oxides
• CPC Class Codes: B01D 53/504 characterised by a specific device
• CPC Class Codes: B01D 53/76 Gas phase processes, e.g. by using aerosols
• CPC Class Codes: B01D 53/8637 Simultaneously removing sulfur oxides and nitrogen oxides
• CPC Class Codes: B01J 20/046 containing halogens, e.g. halides
• CPC Class Codes: C01B 17/56 Separation; Purification
• CPC Class Codes: C01B 7/01 Chlorine; Hydrogen chloride
• CPC Class Codes: C10G 2300/207 Acid gases, e.g. H2S, COS, SO2, HCN
• CPC Class Codes: Y02A 50/20 Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

A desulfurization absorption tower, a method for setting up the same and a method for operating the same. The tower may include an internal anti-corrosion layer that may be used for contacting the flue gas and the desulfurization absorption liquid, may define the tower chamber, and may include stainless steel plate whose thickness is 1.0 mm to 6.0 mm. The tower body may include an external supporting layer that may be used for supporting the anti-corrosion layer and may include carbon steel. The supporting layer and the anti-corrosion layer may be designed to jointly bear a load, wherein the supporting layer may be designed to bear a large part of the load, and the anti-corrosion layer may be designed to bear a small part of the load.

Claims

1. A method for cleaning flue gas, the method comprising:

introducing flue gas into an interior region defined by a stainless steel plate interior layer of a desulfurization absorption tower;

flowing the flue gas up through the tower;

receiving in the interior, through the interior layer, a desulfurization absorption liquid;

transferring chloride ion from the flue gas to the desulfurization absorption liquid;

contacting the chloride ion with the interior layer; and

guiding the chloride ion out of the interior layer, in a desulfurization absorption liquid with a predetermined content of ammonium sulfate, to an ammonium sulfate after-treatment system.

2. The method of claim 1 wherein the contacting comprises:

contacting the absorption liquid with the interior layer at a first location, where steel plate includes steel of a first grade; and

, then,

contacting the absorption liquid with the interior layer at a second location, where the steel plate includes steel of a second grade;

wherein;

the absorption liquid in the first contacting has a first chloride ion concentration;

the absorption liquid in the second contacting has a second chloride ion concentration;

the first grade is preselected for the first concentration; and

the second grade is preselected for the second concentration.

3. The method of claim 2 wherein the grades are preselected corresponds to:

pre-setting anti-corrosion properties of the interior layer; and

defining a flue gas guide path.

4. The method of claim 2 wherein the steel plate has a thickness in the range 1.0 mm to 6.0 mm.

5. The method of claim 2 wherein the steel plate includes:

a cylinder that forms an upright layer of the interior layer;

a bottom face that forms a bottom surface of the interior layer; and

a top face that forms a top surface of the interior layer.

6. The method of claim 2 wherein the first grade is preselected includes the first grade including:

316L stainless steel, corresponding to the first chloride ion concentration being less than 10,000 mg/L;

2205 stainless steel or 2605N stainless steel, corresponding to the first chloride ion concentration being in the range 10,000 mg/L to 20,000 mg/L; and

2507 stainless steel, corresponding to the first chloride ion concentration being no less than 20,000 mg/L.

7. The method of claim 2 wherein the second grade is preselected includes the second grade:

including;

316L stainless steel, corresponding to the second chloride ion concentration being less than 10,000 mg/L;

2205 stainless steel or 2605N stainless steel, corresponding to the second chloride ion concentration being in the range 10,000 mg/L to 20,000 mg/L; and

2507 stainless steel, corresponding to the second chloride ion concentration being no less than 20,000 mg/L.

8. The method of claim 2 wherein a plurality of plates of the first grade and of the second grade are connected together to form at least part of the interior layer.

9. The method of claim 8 wherein the plurality of plates of the:

first grade are connected together to form a first section of the interior layer; and

second grade are connected together to form a second section of the interior layer.

10. The method of claim 2 wherein the introducing, the receiving and the guiding are performed via a plurality of conduits, each traversing the steel plate, the plurality of conduits including:

a flue gas inlet through which the flue gas is introduced into the interior;

a desulfurization absorption liquid inlet through which desulfurization absorption liquid is received in the interior; and

a desulfurization absorption liquid outlet through which used desulfurization absorption liquid is guided out of the interior layer.

11. The method of claim 10 wherein the plurality of conduits further includes:

a flue gas outlet through which cleaned flue gas is exited out of the interior; and

a process water inlet through which water is entered into the interior.

12. The method of claim 10 further comprising:

predetermining, based on parameters of the flue gas;

a size of the interior; and

sizes and positions of;

the flue gas inlet;

a flue gas outlet;

a circulating liquid inlet;

a circulating liquid outlet; and

a process water inlet.

13. The method of claim 2 wherein the contacting further comprises:

contacting the absorption liquid with the interior layer at a third location, where the steel plate includes steel of a third grade;

wherein;

the absorption liquid in the third contacting has a third chloride ion concentration; and

the third grade is preselected for the third concentration.

14. The method of claim 13 wherein the third grade is preselected includes the third grade including:

316L stainless steel, corresponding to the third chloride ion concentration being less than 10,000 mg/L;

2205 stainless steel or 2605N stainless steel, corresponding to the third chloride ion concentration being in the range 10,000 mg/L, to 20,000 mg/L; and

2507 stainless steel, corresponding to the third chloride ion concentration being no less than 20,000 mg/L.

15. The method of claim 13 wherein:

the first grade includes 316L stainless steel;

the second grade includes 2205 stainless steel or 2605N stainless steel; and

the third grade includes 2507 stainless steel.

16. The method of claim 13 wherein a plurality of plates of the first grade, of the second grade and of the third grade are connected together to form at least part of the interior layer.

17. The method of claim 16 wherein the plurality of plates of:

first grade are connected together to form a first section of the interior layer;

second grade are connected together to form a second section of the interior layer; and

third grade are connected together to form a third section of the interior layer.

18. A method for cleaning flue gas, the method comprising:

introducing flue gas into an interior region defined by a stainless steel plate interior layer of a desulfurization absorption tower;

flowing the flue gas up through the tower;

receiving in the interior, through the interior layer, a desulfurization absorption liquid;

transferring chloride ion from the flue gas to the desulfurization absorption liquid;

contacting the chloride ion with the interior layer; and

guiding the chloride ion out of the interior layer, in a desulfurization absorption liquid with a predetermined content of ammonium sulfate.

19. The method of claim 18 wherein the contacting comprises:

contacting the absorption liquid with the interior layer at a first location, where steel plate includes steel of a first grade; and

, then,

contacting the absorption liquid with the interior layer at a second location, where the steel plate includes steel of a second grade;

wherein;

the absorption liquid in the first contacting has a first chloride ion concentration;

the absorption liquid in the second contacting has a second chloride ion concentration;

the first grade is preselected for the first concentration; and

the second grade is preselected for the second concentration.

20. The method of claim 19 wherein the grades are preselected corresponds to:

pre-setting anti-corrosion properties of the interior layer; and

defining a flue gas guide path.

21. The method of claim 19 wherein the steel plate has a thickness in the range 1.0 mm to 6.0 mm.

22. The method of claim 19 wherein the first grade is preselected includes the first grade including:

316L stainless steel, corresponding to the first chloride ion concentration being less than 10,000 mg/L;

2205 stainless steel or 2605N stainless steel, corresponding to the first chloride ion concentration being in the range 10,000 mg/L to 20,000 mg/L; and

2507 stainless steel, corresponding to the first chloride ion concentration being no less than 20,000 mg/L.

23. The method of claim 19 wherein the second grade is preselected includes the second grade:

including;

316L stainless steel, corresponding to the second chloride ion concentration being less than 10,000 mg/L;

2205 stainless steel or 2605N stainless steel, corresponding to the second chloride ion concentration being in the range 10,000 mg/L to 20,000 mg/L; and

2507 stainless steel, corresponding to the second chloride ion concentration being no less than 20,000 mg/L.

24. The method of claim 19 wherein the introducing, the receiving and the guiding are performed via a plurality of conduits, each traversing the steel plate, the plurality of conduits including:

a flue gas inlet through which the flue gas is introduced into the interior;

a desulfurization absorption liquid inlet through which desulfurization absorption liquid is received in the interior; and

a desulfurization absorption liquid outlet through which used desulfurization absorption liquid is guided out of the interior layer.

25. The method of claim 24 further comprising:

predetermining, based on parameters of the flue gas;

a size of the interior; and

sizes and positions of;

the flue gas inlet;

a flue gas outlet;

a circulating liquid inlet;

a circulating liquid outlet; and

a process water inlet.

26. The method of claim 24 wherein the plurality of conduits further includes:

a flue gas outlet through which cleaned flue gas is exited out of the interior; and

a process water inlet through which water is entered into the interior.

27. The method of claim 26 further including:

supplementing process water via the process water inlet; and

guiding the desulfurization absorption liquid with the predetermined content of ammonium sulfate to an ammonium sulfate after-treatment system via a circulating liquid outlet.

28. The method of claim 19 wherein the contacting further comprises:

contacting the absorption liquid with the interior layer at a third location, where the steel plate includes steel of a third grade;

wherein;

the absorption liquid in the third contacting has a third chloride ion concentration; and

the third grade is preselected for the third concentration.

29. The method of claim 28 wherein the third grade is preselected includes the third grade including:

316L stainless steel, corresponding to the third chloride ion concentration being less than 10,000 mg/L;

2205 stainless steel or 2605N stainless steel, corresponding to the third chloride ion concentration being in the range 10,000 mg/L to 20,000 mg/L; and

2507 stainless steel, corresponding to the third chloride ion concentration being no less than 20,000 mg/L.

30. The method of claim 28 wherein:

the first grade includes 316L stainless steel;

the second grade includes 2205 stainless steel or 2605N stainless steel; and

the third grade includes 2507 stainless steel.