Flow balance type spray pipe for wet desulphurization

Abstract

The utility model discloses a flow balance type shower pipe for wet desulphurization, which comprises a main pipe, first-stage branch pipes, second-stage branch pipes, third-stage branch pipes and nozzles, the main pipe is connected with a slurry inlet, the pipe diameter of the main pipe is gradually reduced along the direction far away from the slurry inlet, the main pipe is provided with a plurality of first-stage branch pipes along the axial direction, and the second-stage branch pipes are connected with the nozzles. First-stage branch pipes are connected to the two sides of the main pipe, the pipe diameters of the first-stage branch pipes are gradually reduced in the direction away from the main pipe, second-stage branch pipes are connected to the first-stage branch pipes on the two sides, the pipe diameters of the second-stage branch pipes are gradually reduced in the direction away from the main pipe, third-stage branch pipes are connected to the first-stage branch pipes and the second-stage branch pipes, and nozzles are installed at the tail ends of the third-stage branch pipes. According to the utility model, the mother pipe is arranged outside the wet desulfurization tower, so that the influence on a flue gas flow field is reduced, the nozzles are reasonably arranged, fog sprayed by the nozzles can be completely sprayed on a flow cross section in the desulfurization tower, 360-degree no dead angle exists, the local resistance loss is reduced, and the power is assisted, the energy is saved and the consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of wet desulfurization, in particular to the technical field of spray pipes. Background Art

[0002] The layout and design of the wet flue gas desulfurization spray system ensure that the flue gas and slurry are mixed and fully contacted, which is crucial to improving the desulfurization efficiency and achieving SO2 compliance or ultra-low emissions. The existing solution places the main pipe in the wet flue gas desulfurization tower, and the spray pipes are distributed in the shape of leaf veins. The slurry in the main pipe is distributed to each nozzle through the secondary branch pipe and the tertiary branch pipe. Due to the large diameter of the main pipe, the layout of the nozzles, the full contact between the slurry and the flue gas, and the heat and mass transfer are greatly affected, and a certain amount of resistance is also increased. In addition, the design of the spray system relies more on engineering experience, design standards and specifications, and lacks computational fluid dynamics CFD system simulation calculations. There is a lack of scientific data on whether its internal streamlines are smooth and whether the slurry distribution is balanced. In the era of ultra-low emissions and energy conservation and efficiency improvement in desulfurization, precise design and excellence are more needed. Utility Model Content

[0003] The purpose of the utility model is to solve the problems in the prior art and to provide a flow-balanced spray pipe for wet desulfurization, which can solve the above problems.

[0004] To achieve the above-mentioned purpose, the utility model proposes a flow-balancing spray pipe for wet flue gas desulfurization, comprising a main pipe, a primary branch pipe, a secondary branch pipe, a tertiary branch pipe and a nozzle, wherein the main pipe is connected to a slurry inlet, and the diameter of the main pipe gradually decreases in the direction away from the slurry inlet, the main pipe is axially provided with a plurality of primary branch pipes, and the diameter of the primary branch pipe gradually decreases in the direction away from the main pipe, the primary branch pipes on both sides are connected to secondary branch pipes, and the diameter of the secondary branch pipe gradually decreases in the direction away from the main pipe, the primary branch pipes and the secondary branch pipes are both connected to tertiary branch pipes, the diameter of the tertiary branch pipe is smaller than the diameter of the secondary branch pipe, and a nozzle is installed at the end of the tertiary branch pipe.

[0005] Preferably, the nozzles in the outer circle are distributed in a circle to match the flow cross-section of the desulfurization tower.

[0006] Preferably, the main pipe is located outside the desulfurization tower, and the primary branch pipe, the secondary branch pipe, the tertiary branch pipe and the nozzle are located inside the desulfurization tower.

[0007] Preferably, a plurality of primary branch pipes are arranged in parallel, and the secondary branch pipe is arranged in parallel with the primary branch pipe.

[0008] Preferably, the secondary branch pipe is connected to the primary branch pipe via a bending section.

[0009] Beneficial effects of the utility model: The utility model arranges the main pipe outside the wet flue gas desulfurization tower to reduce the impact on the flue gas flow field, arranges the nozzles reasonably, ensures that the flue gas and slurry are mixed and fully contacted, increases the mass transfer efficiency, and the mist crown sprayed by the nozzle completely covers the flow section in the desulfurization tower, with no dead angles at 360 degrees, reduces local resistance losses, and helps save energy and reduce consumption. The computational fluid dynamics software CFD is used to conduct flow field simulation tests to ensure the diameters, step-by-step diameter changes and transition methods of the main pipe, the first-level branch pipe, the second-level branch pipe and the third-level branch pipe, and ensure that the nozzles are arranged reasonably and the slurry is evenly distributed in each branch pipe.

[0010] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the utility model;

[0012] Figure 2 This is a single-layer spray structure diagram of the desulfurization spray system of the utility model;

[0013] Figure 3 This is a layout diagram of a single-layer spray pipe of the utility model;

[0014] Figure 4 It is the slurry velocity trace distribution of the utility model.

[0015] In the figure: 1-slurry inlet, 2-main pipe, 3-primary branch pipe, 4-secondary branch pipe, 5-tertiary branch pipe, 6-nozzle. DETAILED DESCRIPTION

[0016] See also Figure 1 , Figure 2 A flow balancing spray pipe for wet flue gas desulfurization, comprising a main pipe 2, a primary branch pipe 3, a secondary branch pipe 4, a tertiary branch pipe 5 and a nozzle 6, wherein the main pipe 2 is connected with a slurry inlet 1, and the diameter of the main pipe 2 gradually decreases in a direction away from the slurry inlet 1, and the main pipe 2 is provided with a plurality of primary branch pipes 3 along the axial direction, and the diameter of the primary branch pipe 3 gradually decreases in a direction away from the main pipe 2, and the primary branch pipes 3 on both sides are connected with secondary branch pipes 4, and the diameter of the secondary branch pipe 4 gradually decreases in a direction away from the main pipe 2, and the primary branch pipes 3 on both sides are connected with secondary branch pipes 4. The first branch pipe 3 and the second branch pipe 4 are both connected with a tertiary branch pipe 5, the diameter of the tertiary branch pipe 5 is smaller than the diameter of the second branch pipe 4, and a nozzle 6 is installed at the end of the tertiary branch pipe 5. The nozzles 6 in the outer circle are distributed in a circle matching the flow cross-section of the desulfurization tower. The mother pipe 2 is located outside the desulfurization tower, and the first branch pipe 3, the second branch pipe 4, the tertiary branch pipe 5 and the nozzle 6 are located inside the desulfurization tower. Several first branch pipes 3 are arranged in parallel, the second branch pipe 4 is arranged in parallel with the first branch pipe 3, and the second branch pipe 4 is connected to the first branch pipe 3 through a bending section.

[0017] The utility model uses computational fluid dynamics software CFD to perform flow field simulation tests to ensure the diameters of the main pipe, the first-level branch pipe, the second-level branch pipe and the third-level branch pipe, the step-by-step diameter change and the transition method, and to ensure that the nozzle arrangement is reasonable and the slurry distribution in each branch pipe is balanced.

[0018] Solid modeling of the spray pipe for wet desulfurization, such as Figure 3 ; Structural gridding; Determine the boundary condition type and slurry characteristics; Input boundary conditions; Use computational fluid dynamics software CFD to perform flow field simulation tests. According to the test results, the spray pipe structure is locally optimized, such as Figure 4 , determine the diameter of each branch pipe, the step-by-step diameter change and the transition method to ensure smooth flow lines and balanced slurry distribution in each branch pipe.

[0019] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the protection scope of the present invention.

Claims

1. A flow-balanced spray pipe for wet desulfurization, characterized in that: The invention comprises a main pipe (2), a primary branch pipe (3), a secondary branch pipe (4), a tertiary branch pipe (5) and a nozzle (6); the main pipe (2) is connected to a slurry inlet (1); the diameter of the main pipe (2) gradually decreases in a direction away from the slurry inlet (1); the main pipe (2) is provided with a plurality of primary branch pipes (3) along the axial direction; the diameter of the primary branch pipes (3) gradually decreases in a direction away from the main pipe (2); the primary branch pipes (3) on both sides are connected to secondary branch pipes (4); the diameter of the secondary branch pipes (4) gradually decreases in a direction away from the main pipe (2); the primary branch pipes (3) and the secondary branch pipes (4) are both connected to tertiary branch pipes (5); the diameter of the tertiary branch pipes (5) is smaller than the diameter of the secondary branch pipes (4); and the ends of the tertiary branch pipes (5) are provided with nozzles (6).

2. The flow-balanced spray pipe for wet desulfurization according to claim 1, characterized in that: The nozzles (6) in the outer circle are distributed in a circular shape matching the flow cross section of the desulfurization tower.

3. The flow-balanced spray pipe for wet desulfurization according to claim 1, characterized in that: The main pipe (2) is located outside the desulfurization tower, and the primary branch pipe (3), the secondary branch pipe (4), the tertiary branch pipe (5) and the nozzle (6) are located inside the desulfurization tower.

4. The flow-balanced spray pipe for wet desulfurization according to claim 1, characterized in that: A plurality of primary branch pipes (3) are arranged in parallel with each other, and the secondary branch pipe (4) is arranged in parallel with the primary branch pipe (3).

5. The flow-balanced spray pipe for wet desulfurization according to claim 1, characterized in that: The secondary branch pipe (4) is connected to the primary branch pipe (3) via a bent section.

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