A high-performance fine atomization device for desulfurization slurry

Abstract

A high-performance fine atomization device for desulfurization slurry, comprising an outer cylinder, an atomization nozzle and a fine atomization plate. The upper part of the outer cylinder is a hollow cylindrical structure, and the uppermost end of the cylinder is a compressed gas inlet. The lower part of the outer cylinder is a hollow enlarged-diameter pipe. An atomization nozzle for an external liquid medium is arranged in the upper hollow circular pipe of the outer cylinder. The center line of the atomization nozzle coincides with the center line of the cylinder. The difference between the spray cone angle of the atomization nozzle and the expansion angle of the flared opening does not exceed 2°. The flared opening at the lower end of the outer cylinder is closed by a fine atomization plate with sieve holes. By using the present invention, droplets with a median particle size within 50 μm can be obtained, and naturally formed desulfurization slurry droplets can also be obtained. The structure of the present invention is simple, the median particle size of the atomized droplets is small, the particle uniformity is good, and the service life is long.

Description

Technical Field

[0001] The present invention relates to an atomizing device, and more particularly to a high-performance fine atomizing device for desulfurization slurry. Background Art

[0002] The SO in the flue gas of power generation units burning fuels such as biomass, garbage or blast furnace gas 2 content is only at a relatively low level of 50-200 mg / m 3 For flue gas desulfurization, the SDA semi-dry desulfurization process of calcium-based rotary spray drying with a simple process is adopted. This process usually uses slaked lime as the desulfurizing agent, and its system is simple with relatively low operation and maintenance costs. However, this process requires atomizing the lime slurry containing solid particles into ultra-fine droplets with a median particle size of about 50 um to ensure that the desulfurization droplets are completely evaporated in the hot flue gas.

[0003] For existing atomizing nozzles, whether they are single-medium, double-medium nozzles or ultrasonic nozzles, the fine nozzles with small atomizing particle size cannot meet the flow requirements, while those with large capacity cannot meet the atomizing particle size requirements. Currently, high-speed cyclone atomizers are generally used in the domestic SDA desulfurization process, with a rotation speed reaching over 10,000 r / h, which poses strict requirements for the manufacture of the atomizer, resulting in a short equipment life and a high operation failure rate. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a high-performance fine atomizing device for desulfurization slurry that can meet the atomizing requirements of the SDA desulfurization process.

[0005] The technical solution adopted by the present invention to solve its technical problem is a high-performance fine atomizing device for desulfurization slurry, which includes an outer cylinder. The upper end of the outer cylinder is provided with a compressed gas inlet, and the lower end is a flared mouth, which is closed by a fine atomizing plate with sieve holes. An atomizing nozzle for connecting the liquid medium to be atomized is arranged inside the outer cylinder. The outlet center line of the atomizing nozzle coincides with the center line of the outer cylinder, and the difference between the spray cone angle of the atomizing nozzle and the expansion angle of the flared mouth does not exceed 2°.

[0006] Further, the atomizing nozzle is an ordinary single-medium or double-medium nozzle (shown as a single-medium nozzle in the figure), and the median particle size of the nozzle atomization is ≤200 um.

[0007] Further, the fine atomizing plate is a uniformly perforated screen, and the screen uses a 10-20 mesh sieve plate with a sieve hole diameter of ≤2 mm.

[0008] Further, the compressed gas is air.

[0009] Further, the compressed gas is air carrying desulfurizing agent powder.

[0010] The present invention first atomizes the liquid medium to be atomized through an internal nozzle arranged at the center into droplets with a median particle size not greater than 200 μm. The ejected droplets are evenly distributed on the fine atomization plate and form a relatively thin liquid film. Under the combined action of compressed gas and the impact of the atomized droplets ejected at high speed, the liquid film bulges out from the small holes on the atomization plate and is further broken into droplets with a median particle size within 50 μm, thereby achieving fine atomization of the liquid medium. When the compressed gas is mixed with a desulfurizing agent (lime powder or limestone powder), while the compressed gas breaks the liquid film, it can also capture the desulfurizing agent powder carried by the compressed gas through the liquid film or droplets, naturally forming desulfurized slurry droplets; the structure of the present invention is simple, the median particle size of the atomized droplets is small, the particle uniformity is good, and the service life is long. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0012] In the figure: 1 - cylinder, 11 - upper hollow circular pipe of the outer cylinder, 12 - compressed gas inlet, 13 - hollow enlarged diameter pipe of the outer cylinder, 2 - atomizing nozzle, 3 - fine atomization plate, α - spray cone angle of the atomizing nozzle, β - inclination angle of the flared opening. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0013] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0014] Referring to the attached Figure 1 , this embodiment includes an outer cylinder 1, an atomizing nozzle 2 and a fine atomization plate 3. The upper part of the outer cylinder 1 is a hollow circular pipe 11, and the uppermost end is a compressed gas inlet 12 for connecting a compressed gas supply pipeline; the lower part of the outer cylinder 1 is a hollow enlarged diameter pipe 13, and the flared opening at its lowermost end is closed by a fine atomization plate 3 with sieve holes. An atomizing nozzle 2 is arranged in the upper cylindrical section of the outer cylinder 1. The outlet center line of the atomizing nozzle 2 coincides with the center line of the cylinder 1. The spray cone angle α of the atomizing nozzle 2 is basically the same as the expansion angle β of the flared opening, and the difference between the two does not exceed 2°.

[0015] The water inlet pipe 21 of the atomizing nozzle 2 extends outside the wall of the cylinder 1 and is connected to the liquid medium supply pipeline to be atomized.

[0016] The built-in atomizing nozzle 2 serves as a primary atomizing nozzle and adopts a single-medium or compressed air double-medium nozzle (shown as a single-medium nozzle in the figure). The median atomization particle size of the atomizing nozzle 2 is ≤200 μm.

[0017] The fine atomization plate 3 arranged at the outlet of the flared opening of the hollow enlarged diameter pipe 13 serves as a secondary atomizing spray surface and is the spray outlet of a fine atomization device. The fine atomization plate 3 is a uniformly perforated sieve mesh, and a 10 - 20 mesh sieve plate is adopted, and the aperture of the sieve holes is ≤2 mm.

[0018] The compressed gas may carry desulfurizer powder. While the liquid film is broken, the desulfurizer powder is captured by the liquid film or liquid droplets, and desulfurized slurry droplets with good atomization degree are naturally formed.

[0019] Working process: Compressed gas is input through the compressed gas inlet 12 at the upper end of the cylinder 1. The compressed gas enters from the upper end of the outer cylinder 1. The atomizing nozzle 2 breaks the liquid medium to be atomized and sprays it out within 200 μm. The sprayed liquid droplets form a relatively thin and uniform liquid film on the fine atomizing plate 3. The liquid film on the fine atomizing plate 3 is ejected from the sieve holes on the fine atomizing plate 3 in the form of bubble collision under the combined action of the compressed air and the high-speed liquid droplets ejected by the nozzle. The median particle size of the ejected liquid film is below 50 μm. When the compressed gas is a mixture of air and desulfurizer powder, while the liquid film is broken, the desulfurizer powder is captured by the liquid film or liquid droplets, and desulfurized slurry droplets with good atomization degree are naturally formed.

[0020] In this embodiment, first, the liquid medium to be atomized is atomized into droplets with a median particle size not greater than 200 μm by the built-in atomizing nozzle 2 arranged in the center. The sprayed liquid droplets are evenly distributed on the fine atomizing plate 3 and form a relatively thin liquid film. Under the combined action of the compressed gas and the high-speed liquid droplets ejected by the atomizing nozzle 2, the liquid film bulges out from the sieve holes on the atomizing plate and is further broken into droplets with a median particle size within 50 μm, so as to achieve fine atomization of the liquid medium. When the compressed gas is mixed with a desulfurizer (lime powder or limestone powder), while the compressed gas breaks the liquid film, it can also capture the desulfurizer powder carried by the compressed gas through the liquid film or liquid droplets, and desulfurized slurry droplets are naturally formed.

[0021] Those skilled in the art can make various modifications and variations to the present invention. Provided that these modifications and variations are within the scope of the claims of the present invention and its equivalent technologies, these modifications and variations are still within the protection scope of the present invention patent.

[0022] Contents not described in detail in the specification are well-known prior arts to those skilled in the art.

Claims

1. A high-performance fine atomization device for desulfurization slurry, comprising an outer cylinder, an atomizing nozzle and a fine atomization plate. The upper part of the outer cylinder is a hollow cylindrical structure, and the uppermost end of the cylinder is an inlet for compressed gas. The lower part of the outer cylinder is a hollow expanded-diameter pipe. It is characterized in that: An atomizing nozzle for external liquid medium is arranged in the upper hollow circular pipe of the outer cylinder. The central axis of the atomizing nozzle coincides with the central axis of the cylinder. The difference between the spray cone angle of the atomizing nozzle and the expansion angle of the flared opening does not exceed 2°. The outlet of the flared opening at the lower end of the outer cylinder is closed by a fine atomization plate with sieve holes. The atomizing nozzle is a single-medium or double-medium nozzle, and the median atomization particle size of the nozzle is ≤200um. The fine atomization plate is a sieve mesh with uniformly opened holes. The sieve mesh is a 10-20 mesh sieve plate, and the aperture of the sieve holes is ≤2mm. The compressed gas is air. The compressed gas carries desulfurizer powder and mixes it evenly with the desulfurizer powder.

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