Efficient wet desulfurization tower device

Abstract

The utility model discloses an efficient wet desulfurization tower device which comprises a wet desulfurization absorption tower, and a swirler, a desulfurization spraying pipe and a demisting assembly are sequentially and fixedly arranged in the wet desulfurization absorption tower in the direction from a flue gas inlet to a flue gas outlet of the wet desulfurization absorption tower; the desulfurization spraying pipe comprises a first spraying main pipe and a second spraying main pipe which are arranged side by side, a plurality of spraying branch pipes are arranged on the two sides of the first spraying main pipe and the two sides of the second spraying main pipe side by side, double-head nozzles are fixedly installed on the spraying branch pipes, and the distance between every two adjacent double-head nozzles does not exceed 30 cm; the double-head nozzle comprises a nozzle body, and a first nozzle and a second nozzle are symmetrically arranged on the two sides of the nozzle body. The single desulfurization absorption tower and the single-stage desulfurization spraying assembly are adopted, and the desulfurization efficiency can reach 98% or above.

Description

Technical Field

[0001] The present application relates to the technical field of desulfurization equipment, and in particular to a high-efficiency wet desulfurization tower device. Background Art

[0002] Coal-fired power plants have always been major pollutant emitters, including SO2, NO x Coal-fired power plants are one of the main sources of atmospheric pollutants such as carbon monoxide and soot. To control environmental pollution, my country has continuously updated emission control standards for thermal power plants, raising pollutant emission limits. Power generation companies have also actively invested in environmental improvements. However, the concentration and total amount of pollutants emitted by coal-fired power plants remain higher than those from other clean energy sources.

[0003] Currently, limestone wet desulfurization technology is widely used in coal-fired power plants due to its relatively high desulfurization efficiency and the high economic benefits of the byproduct gypsum. Existing limestone wet desulfurization technology generally achieves desulfurization efficiencies exceeding 95%. However, with the tightening of environmental emission control standards in my country, this desulfurization efficiency is no longer fully met. When the quality of the coal used by power plants deteriorates, pollutant emissions from existing limestone wet desulfurization equipment can exceed environmental emission control standards. Therefore, there is a need to further improve the desulfurization efficiency of limestone wet desulfurization equipment.

[0004] Currently, there are two main methods for improving the desulfurization efficiency of limestone wet flue gas desulfurization equipment. One is to use a single desulfurization absorber and then improve desulfurization efficiency by installing a multi-stage desulfurization spray assembly; the other is to improve desulfurization efficiency by installing a multi-stage desulfurization absorber. Installing a multi-stage desulfurization spray assembly increases spray energy consumption and significantly increases the content of spray droplets in the flue gas, greatly increasing the burden of demisting and dust removal. Installing a multi-stage desulfurization absorber significantly increases the modification cost and also increases the equipment's footprint. Summary of the Invention

[0005] In order to solve at least one of the above technical problems, a desulfurization device is developed that uses a single desulfurization absorption tower and a single-stage desulfurization spray assembly, and the desulfurization efficiency can reach more than 98%. This application provides a high-efficiency wet desulfurization tower device.

[0006] The present application provides a high-efficiency wet desulfurization tower device, including a wet desulfurization absorption tower, in which a cyclone, a desulfurization spray pipe and a demisting assembly are fixedly arranged in sequence along the flue gas inlet to the flue gas outlet of the wet desulfurization absorption tower; the desulfurization spray pipe includes a No. 1 spray main pipe and a No. 2 spray main pipe arranged side by side, and a plurality of spray branches are arranged side by side on both sides of the No. 1 spray main pipe and the No. 2 spray main pipe, and double-headed nozzles are fixedly installed on the spray branches, and the spacing between adjacent double-headed nozzles does not exceed 30 cm; the double-headed nozzle includes a nozzle body, and a No. 1 nozzle and a No. 2 nozzle are symmetrically arranged on both sides of the nozzle body.

[0007] Optionally, the number of blades of the cyclone is 10 to 14.

[0008] Further optionally, the blade inclination angle of the cyclone is 50° to 70°.

[0009] Optionally, the demisting assembly includes a ridge-type demisting device and a cyclone demisting device arranged in sequence from bottom to top.

[0010] Further optionally, the ridge-type demister adopts a two-stage ridge-type demister.

[0011] Further optionally, the number of blades of the cyclone demister is 16 to 18, and the blade inclination angle is 40° to 50°.

[0012] Further optionally, the distance between the ridge-type demister and the cyclone demister is 1100 to 1300 mm.

[0013] Optionally, the high-efficiency wet desulfurization tower device further includes a wet electrostatic precipitator, and the wet electrostatic precipitator is connected to the flue gas outlet of the wet desulfurization absorption tower through a pipeline.

[0014] Further optionally, a cooling component is provided on the connecting pipeline between the wet electrostatic precipitator and the wet desulfurization absorption tower.

[0015] Further optionally, a booster fan is provided on the connecting pipeline between the wet electrostatic precipitator and the wet desulfurization absorption tower.

[0016] In summary, the present invention includes at least one of the following beneficial technical effects:

[0017] 1. This application adopts a single desulfurization absorption tower and a single-stage desulfurization spray assembly. By adopting a desulfurization spray pipe with a specific structure, the distribution of the nozzles is optimized, which can greatly increase the contact area between the sprayed slurry and the flue gas, thereby effectively improving the desulfurization efficiency. The desulfurization efficiency can reach more than 98%.

[0018] 2. This application adopts a single desulfurization absorption tower and a single-stage desulfurization spray assembly. While improving the desulfurization efficiency, it does not excessively increase the collision of spray droplets, and therefore does not cause excessive burden on the subsequent demisting assembly.

[0019] 3. This application adopts a single-tower design, which has a relatively low overall cost and occupies a relatively low site area. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a high-efficiency wet desulfurization tower device according to Example 1 of the present application;

[0021] Figure 2 This is a schematic structural diagram of a high-efficiency wet desulfurization tower device according to Example 2 of the present application;

[0022] Figure 3 This is a schematic diagram of the structure of the cyclone in this application;

[0023] Figure 4 This is a schematic diagram of the structure of the desulfurization spray pipe for this application;

[0024] Figure 5 This is a schematic diagram of the structure of the double-headed nozzle of the desulfurization spray pipe of this application;

[0025] In the figure: 1. Wet desulfurization absorption tower; 11. Flue gas inlet; 12. Flue gas outlet; 2. Wet electrostatic precipitator; 3. Cyclone; 4. Desulfurization spray pipe; 41. No. 1 spray main pipe; 42. No. 2 spray main pipe; 43. Spray branch pipe; 44. Double-headed nozzle; 5. Ridge-type demister; 6. Cyclone demister; 7. Oxidation air component; 8. Chimney. DETAILED DESCRIPTION

[0026] The present application is further described in detail below with reference to the accompanying drawings and examples.

[0027] like Figure 1 As shown, the present application designs a high-efficiency wet desulfurization tower device, including a wet desulfurization absorption tower 1. Within the wet desulfurization absorption tower 1, a cyclone 3, a desulfurization spray pipe 4, and a demisting assembly are fixedly installed in sequence along the direction from the flue gas inlet 11 to the flue gas outlet 12 of the wet desulfurization absorption tower 1. The desulfurization spray pipe 4 of the present application is connected to the slurry pool within the wet desulfurization absorption tower 1 via a pumping assembly, which pumps limestone slurry in the slurry pool to the desulfurization spray pipe 4 for spraying.

[0028] In order to improve the desulfurization efficiency, the present application has made a special design on the structure of the desulfurization spray pipe 4. Figure 4As shown, the desulfurization spray pipe 4 of the present application includes a No. 1 spray main pipe 41 and a No. 2 spray main pipe 42, both of which are straight pipe structures. Multiple spray branch pipes 43 are arranged side by side on both sides of the No. 1 and No. 2 spray main pipes 41, 42. Double-ended nozzles 44 are fixedly mounted on each of the spray branch pipes 43. The number and spacing of the spray branch pipes 43, as well as the number and spacing of the double-ended nozzles 44, must ensure that the spacing between adjacent double-ended nozzles 44 does not exceed 30 cm.

[0029] like Figure 5 As shown, the double-ended nozzle 44 of the present application includes a nozzle body, and a first nozzle 441 and a second nozzle 442 are symmetrically arranged on both sides of the nozzle body.

[0030] The above-mentioned design of the present application ensures that the nozzles of the desulfurization spray pipe 4 are relatively evenly distributed and have a large distribution density. At the same time, the present application also provides a cyclone 3 between the flue gas inlet 11 and the desulfurization spray pipe 4, which can slow the flow rate of the flue gas and form a cyclone, effectively increasing the residence time of the flue gas in the wet desulfurization absorption tower 1. The above-mentioned design can significantly increase the contact area between the sprayed slurry and the flue gas, thereby effectively improving the removal rate of sulfur dioxide in the flue gas.

[0031] In addition, the design of this application does not use a multi-stage desulfurization spray assembly, thereby avoiding the increase in the collision rate of the spray droplets caused by the multi-stage desulfurization spray assembly. The content of tiny droplets in the flue gas is effectively controlled, and therefore does not cause excessive burden on the subsequent demisting assembly.

[0032] The following are examples of this application

[0033] Example 1

[0034] The high-efficiency wet desulfurization tower device of this embodiment includes a wet desulfurization absorption tower 1. Inside the wet desulfurization absorption tower 1, a cyclone 3, a desulfurization spray pipe 4 and a demisting component are fixedly arranged in sequence along the flue gas inlet 11 to the flue gas outlet 12 of the wet desulfurization absorption tower 1.

[0035] The cyclone 3 of this embodiment has 10 blades, and the blade inclination angle is 50°.

[0036] The demisting assembly of this embodiment is a two-stage design, with a ridge-type demisting device 5 and a cyclone demisting device 6 arranged in sequence from bottom to top, with a distance of 1300 mm between the two.

[0037] The ridge-type demister 5 of this embodiment is a single-stage ridge-type demister. The cyclone demister 6 of this embodiment has 16 blades, and the blade inclination angle is 40°.

[0038] In the desulfurization spray pipe 4 of this embodiment, the distance between adjacent double-headed nozzles 44 is 30 cm.

[0039] The rest of the wet desulfurization absorption tower 1 of this embodiment is similar to the existing desulfurization absorption tower, and is also provided with an oxidation wind component 7. An intelligent control system is used to monitor the slurry in the slurry pool to ensure normal operation.

[0040] Example 2

[0041] The structure of this embodiment is basically similar to that of embodiment 1, except that a wet electrostatic precipitator 2 is additionally provided.

[0042] The inlet of the wet electrostatic precipitator 2 of this embodiment is connected to the flue gas outlet 12 of the wet desulfurization absorption tower 1 via a pipeline. A cooling assembly and a booster blower (not shown) are provided on this pipeline. The outlet of the wet electrostatic precipitator 2 is connected to the gas inlet of a chimney 8, through which the dedusted flue gas is discharged.

[0043] This embodiment incorporates a wet electrostatic precipitator 2, a cooling assembly for flue gas cooling, and a booster fan for increasing the pressure when flue gas velocity is insufficient. This effectively removes droplets and dust from the desulfurized flue gas, as well as trace amounts of SO₃, further improving desulfurization efficiency while reducing pollutant emissions.

[0044] Example 3

[0045] The structure of this embodiment is basically similar to that of embodiment 2, except for the structural parameters of the cyclone 3 .

[0046] The cyclone 3 of this embodiment has 14 blades, and the blade inclination angle is 70°.

[0047] Example 4

[0048] The structure of this embodiment is basically similar to that of embodiment 2, except for the structural parameters of the cyclone 3 .

[0049] The cyclone 3 of this embodiment has 12 blades, and the blade inclination angle is 60°.

[0050] Example 5

[0051] The structure of this embodiment is basically similar to that of embodiment 4, the difference being the structural parameters of the demisting assembly.

[0052] In this embodiment, the distance between the ridge-type demister 5 and the cyclone demister 6 is 1100 mm, and the ridge-type demister 5 is a two-stage ridge-type demister.

[0053] The cyclone demister of this embodiment has 18 blades, and the blade inclination angle is 50°.

[0054] Example 6

[0055] The structure of this embodiment is basically similar to that of embodiment 4, the difference being the structural parameters of the demisting assembly.

[0056] In this embodiment, the distance between the ridge-type demister 5 and the cyclone demister 6 is 1160 mm, and the ridge-type demister 5 is a two-stage ridge-type demister.

[0057] The cyclone demister of this embodiment has 18 blades, and the blade inclination angle is 46°.

[0058] The performance of the high-efficiency wet desulfurization tower devices of Examples 1 to 6 of the present application was tested, and the specific testing process is as follows.

[0059] The high-efficiency wet desulfurization tower devices of Examples 1 to 6 were respectively used as limestone-gypsum wet desulfurization devices of a 630MW coal-fired unit to maintain peak power generation operation for 30 days.

[0060] The desulfurization efficiency is calculated by detecting the sulfur content in the initial flue gas and the sulfur content in the exhaust flue gas; at the same time, the PM content in the exhaust flue gas is detected. 2.5 The obtained test data are shown in Table 1 below.

[0061] Table 1 Performance test data of Examples 1 to 6

[0062] Desulfurization efficiency (%) <![CDATA[PM 2.5 Concentration (mg / m 3 )]]> Example 1 98.1 49.8 Example 2 98.7 13.2 Example 3 98.4 13.9 Example 4 98.9 12.4 Example 5 99.0 10.8 Example 6 99.0 9.9

[0063] It can be seen from the data in Table 1 that the high-efficiency wet desulfurization tower device of Examples 1 to 6 of the present application has a high desulfurization efficiency, and the actual desulfurization efficiency exceeds 98%. It can also be seen from the data in Table 1 that the high-efficiency wet desulfurization tower device of the present application can significantly reduce PM2.5 in the exhaust gas after adding the wet electrostatic precipitator 2. 2.5 The concentration of desulfurization is further improved.

[0064] In addition, it can be seen from the data in Table 1 that after optimizing the parameters of the cyclone 3 and the parameters of the demisting component, the emission of pollutants can be further reduced.

[0065] The applicant also tested different designs of the desulfurization spray pipe 4 of the present application. The spacing between adjacent double-headed nozzles 44 was 25 to 30 cm, and the overall pollutant emissions were relatively low.

[0066] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A high-efficiency wet desulfurization tower device, comprising a wet desulfurization absorption tower (1), characterized in that: In the wet desulfurization absorption tower (1), a cyclone (3), a desulfurization spray pipe (4) and a demisting assembly are fixedly arranged in sequence along the direction from the flue gas inlet (11) to the flue gas outlet (12) of the wet desulfurization absorption tower (1); the desulfurization spray pipe (4) includes a No. 1 spray main pipe (41) and a No. 2 spray main pipe (42) arranged side by side, and a plurality of spray branch pipes (43) are arranged side by side on both sides of the No. 1 spray main pipe (41) and the No. 2 spray main pipe (42), and a double-headed nozzle (44) is fixedly installed on the spray branch pipe (43), and the spacing between adjacent double-headed nozzles (44) does not exceed 30 cm; the double-headed nozzle (44) includes a nozzle body, and a No. 1 nozzle (441) and a No. 2 nozzle (442) are symmetrically arranged on both sides of the nozzle body.

2. The high-efficiency wet desulfurization tower device according to claim 1, characterized in that: The number of blades of the cyclone (3) is 10 to 14.

3. The high-efficiency wet desulfurization tower device according to claim 2, characterized in that: The blade inclination angle of the cyclone (3) is 50° to 70°.

4. The high-efficiency wet desulfurization tower device according to claim 1, characterized in that: The demisting assembly comprises a ridge-type demisting device (5) and a cyclone demisting device (6) which are arranged in sequence from bottom to top.

5. The high-efficiency wet desulfurization tower device according to claim 4, characterized in that: The ridge-type demister (5) adopts a two-stage ridge-type demister.

6. The high-efficiency wet desulfurization tower device according to claim 4, characterized in that: The number of blades of the cyclone demister (6) is 16 to 18, and the blade inclination angle is 40° to 50°.

7. The high-efficiency wet desulfurization tower device according to claim 4, characterized in that: The distance between the ridge-type demister (5) and the cyclone demister (6) is 1100-1300 mm.

8. The high-efficiency wet desulfurization tower device according to claim 1, characterized in that: The high-efficiency wet desulfurization tower device further comprises a wet electrostatic precipitator (2), and the wet electrostatic precipitator (2) is connected to the flue gas outlet (12) of the wet desulfurization absorption tower (1) via a pipeline.

9. The high-efficiency wet desulfurization tower device according to claim 8, characterized in that: A cooling assembly is provided on the connecting pipeline between the wet electrostatic precipitator (2) and the wet desulfurization absorption tower (1).

10. The high-efficiency wet desulfurization tower device according to claim 8, characterized in that: A booster fan is provided on the connecting pipeline between the wet electrostatic precipitator (2) and the wet desulfurization absorption tower (1).

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