A desulfurization slurry spraying device

Abstract

The present invention proposes a desulfurization slurry spraying device, which is composed of more than two spraying layers, and the spraying layers are arranged in sequence from top to bottom in the desulfurization tower. The spraying layers include a main mother pipe, a support beam, a secondary mother pipe, a branch pipe, a first nozzle and a second nozzle. The main mother pipe is supported by a support beam, and both ends of the support beam are fixed on the tower wall of the desulfurization tower. The two sides of the main mother pipe are connected to a plurality of secondary mother pipes, and the two sides of the secondary mother pipe are connected to a plurality of branch pipes, and the branch pipes are not terminated with nozzles. The nozzles include a first nozzle or a second nozzle. The adjacent two spraying layers are composed of an upper spraying layer and a lower spraying layer. The main mother pipe of the lower spraying layer and the main mother pipe of the upper spraying layer have an angle β in the top view projection. The spraying device can basically solve the phenomenon of flue gas escaping along the wall, improve the desulfurization rate and dust removal rate, appropriately reduce the liquid-gas ratio, and meet more stringent environmental protection requirements.

Description

[Technical field]

[0001] The invention relates to the technical field of spraying devices, in particular to a desulfurization slurry spraying device. [Background technology]

[0002] The spray device is one of the core equipment of the wet desulfurization spray tower, which has a direct impact on the desulfurization efficiency and dust removal rate. The spray device is generally composed of support parts, main pipes, branch pipes and nozzles. The desulfurization slurry enters the spray device through the pump, and the slurry is distributed to the nozzle through the main pipe and branch pipes, and then sprayed out in atomization, fully contacting with the flue gas flowing in the reverse direction, so as to achieve the purpose of removing sulfur dioxide and dust.

[0003] The existing conventional spraying device consists of 2 to 5 spraying layers, which are arranged up and down in the desulfurization tower. Each spraying layer is equipped with 1 to 2 main pipes, and each main pipe is equipped with several branch pipes on both sides, and nozzles are arranged on both sides of the branch pipes. The nozzles are generally evenly arranged in the entire cross-section of the desulfurization tower. The arrangement spacing of the nozzles near the support beam area and the main pipe will be appropriately increased to prevent the slurry from being washed away at close range.

[0004] Disadvantages of the prior art

[0005] 1. Since the nozzles of the existing spray device are evenly arranged in the entire cross section, after the slurry is sprayed out through the nozzles, the slurry mist crowns overlap with each other, with a large overlap in the central area and a small overlap at the edge of the desulfurization tower, resulting in a large amount of flue gas escaping along the wall, and the removal rate of sulfur dioxide and dust is greatly reduced;

[0006] 2. In order to ensure a certain spray coverage rate, the nozzle spacing has certain requirements. At the support beam and the larger mother pipe diameter, the atomized slurry often causes scouring and wear;

[0007] 3. When individual nozzles are blocked, flue gas short circuit is formed, and SO2 and dust are likely to exceed the emission standards;

[0008] 4. The spray layers do not cross, or the crossing angle is inappropriate, which cannot offset the weak areas between the upper and lower spray layers, especially along the area near the tower. [Summary of the invention]

[0009] The purpose of the present invention is to solve the problems in the prior art and to provide a desulfurization slurry spraying device, which can improve the desulfurization rate and dust removal rate, appropriately reduce the liquid-gas ratio, and meet more stringent environmental protection requirements.

[0010] To achieve the above-mentioned purpose, the present invention proposes a desulfurization slurry spraying device, which is composed of more than two spray layers, and the spray layers are arranged in sequence from top to bottom in the desulfurization tower. The spray layers include a main mother pipe, a support beam, a secondary mother pipe, a branch pipe, a first nozzle and a second nozzle. The main mother pipe is supported by a support beam, and both ends of the support beam are fixed on the tower wall of the desulfurization tower. The two sides of the main mother pipe are connected to a plurality of secondary mother pipes, and the two sides of the secondary mother pipe are connected to a plurality of branch pipes, and the branch pipes are not terminated with nozzles. The nozzles include a first nozzle or a second nozzle, and two adjacent spray layers are composed of an upper spray layer and a lower spray layer. The main mother pipe of the lower spray layer has an angle β with the top projection of the main mother pipe of the upper spray layer.

[0011] Preferably, looking from top to bottom, the angle β between the main main pipe of the lower spray layer and the main main pipe of the upper spray layer is 360 / (the number of nozzles in the edge area A)×(n+0.5), where n is a natural number of 1-4.

[0012] Preferably, the nozzles are arranged in two areas in the desulfurization tower, including an edge area A and a central area B. The first nozzle is arranged in the central area B, and the spacing length d between two adjacent first nozzles is the same, which is not greater than 1100 mm. The second nozzle is arranged in the edge area A, and the arrangement trajectory of the second nozzle is a distribution circle, and the diameter of the distribution circle is 1000 to 1200 mm smaller than the inner diameter of the tower wall of the desulfurization tower.

[0013] Preferably, the central area B is a circular area, the diameter of which is smaller than the circular diameter of the cross-sectional area of ​​the tower wall of the desulfurization tower, and the edge area A is an annular area formed by removing the central area B from the cross-sectional area of ​​the tower wall of the desulfurization tower.

[0014] Preferably, the first nozzle is a unidirectional 120-degree hollow cone spray nozzle. When a first nozzle fails, the mist crowns produced by the surrounding first nozzles still cover the area. The second nozzle is a unidirectional 90-degree solid cone spray nozzle.

[0015] Preferably, the first nozzle can be arranged to be sunken to prevent scouring of the main pipe and the support beam, and the sinking distance h is less than 350 mm.

[0016] Preferably, the secondary mother pipes are arranged at intervals along the length direction of the main mother pipe, and the branch pipes are arranged at intervals along the length direction of the secondary mother pipe.

[0017] Preferably, the axis of the main mother pipe coincides with a diameter of a circle where the cross section of the desulfurization tower lies.

[0018] Beneficial effects of the present invention: The present invention basically solves the problem of flue gas escaping along the wall by setting different nozzle arrangements in the edge area A and the center area B and setting a suitable angle between the upper and lower spray layers, improves the desulfurization rate and dust removal rate, can appropriately reduce the liquid-gas ratio, and can meet more stringent environmental protection requirements. The first nozzle is arranged in a square manner, combined with the control of equidistant arrangement, so that the flue gas does not short-circuit when some nozzles fail. The sinking arrangement of the nozzle prevents scouring and wear of the support beam and the main pipe, greatly improving the operating stability and reliability of the spraying device.

[0019] 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

[0020] Figure 1 It is a three-dimensional layout schematic diagram of a desulfurization slurry spraying device of the present invention;

[0021] Figure 2 It is a schematic diagram of the plan layout of a desulfurization slurry spraying device of the present invention;

[0022] Figure 3 It is a cross-sectional view of the desulfurization slurry spraying device of the present invention in the AA direction, and a schematic diagram of the water spray sinking arrangement;

[0023] Figure 4 It is a schematic diagram of the cross arrangement of the upper and lower spray layers of a desulfurization slurry spraying device of the present invention;

[0024] Figure 5 It is an enlarged schematic diagram of the planar layout of a desulfurization slurry spraying device of the present invention. [Specific implementation method]

[0025] See also Figures 1 to 5 The present invention provides a desulfurization slurry spraying device, which is composed of more than two spray layers, and the spray layers are arranged in sequence from top to bottom in a desulfurization tower. The spray layers include a main mother pipe 1, a support beam 2, a secondary mother pipe 3, a branch pipe 4, a first nozzle 5 and a second nozzle 6. The main mother pipe 1 is supported by the support beam 2, and both ends of the support beam 2 are fixed on the tower wall 7 of the desulfurization tower. Both sides of the main mother pipe 1 are connected to a plurality of secondary mother pipes 3, and both sides of the secondary mother pipe 3 are connected to a plurality of branch pipes 4, and the branch pipes 4 are not terminated with nozzles. The nozzles include a first nozzle 5 or a second nozzle 6. Two adjacent spray layers are composed of an upper spray layer 9 and a lower spray layer 8. The main mother pipe 1 of the lower spray layer 8 and the main mother pipe 1 of the upper spray layer 9 have an angle β as viewed from above. Looking from top to bottom, the angle β between the main main pipe 1 of the lower spray layer 8 and the main main pipe 1 of the upper spray layer 9 is 360 / (number of nozzles in edge area A)×(n+0.5), where n is a natural number of 1-4.

[0026] Further, the nozzles are arranged in two areas in the desulfurization tower, including the edge area A and the center area B. The first nozzle 5 is arranged in the center area B. The spacing length d between two adjacent first nozzles 5 is the same, and d is not greater than 1100mm. The second nozzle 6 is arranged in the edge area A. The arrangement trajectory of the second nozzle 6 is a distribution circle, and the diameter of the distribution circle is 1000-1200mm smaller than the inner diameter of the tower wall 7 of the desulfurization tower. The center area B is a circular area, and the diameter of the center area B is smaller than the diameter of the cross-sectional circle of the tower wall 7 of the desulfurization tower. The edge area A is an annular area formed by removing the center area B from the cross-sectional area of ​​the tower wall 7 of the desulfurization tower. The first nozzle 5 adopts a unidirectional 120-degree hollow cone spray nozzle. When a first nozzle 5 fails, the mist crown generated by the surrounding first nozzles 5 still covers the area. The second nozzle 6 adopts a unidirectional 90-degree solid cone spray nozzle. The first nozzle 5 can be arranged to sink to prevent scouring of the main main pipe 1 and the support beam 2, and the sinking distance h is less than 350mm. The secondary mother pipes 3 are arranged at intervals along the length direction of the main mother pipe 1, and the branch pipes 4 are arranged at intervals along the length direction of the secondary mother pipe 3. The axis of the main mother pipe 1 coincides with a diameter of a circle where the cross section of the desulfurization tower is located.

[0027] Working process of the present invention:

[0028] The desulfurization slurry spraying device of the present invention can make the overlap between the center area and the edge area more uniform through different nozzle arrangement patterns in the edge area A and the center area B, avoid causing a large amount of flue gas to escape along the wall, and improve the removal rate of sulfur dioxide and dust; when a first nozzle 5 fails, the mist crown generated by the surrounding first nozzles 5 still covers the area, and the first nozzle 5 adopts a sinking arrangement to prevent scouring of the main mother pipe 1 and the support beam 2, and the setting of the appropriate angle between the upper and lower spray layers can make the weak areas between the upper and lower spray layers offset each other, especially along the area near the tower, basically solve the problem of flue gas escaping along the wall, improve the desulfurization rate and dust removal rate, and appropriately reduce the liquid-gas ratio, which can meet more stringent environmental protection requirements. By combining the square nozzle arrangement with the control of the arrangement spacing, it can be achieved that the flue gas does not short-circuit when some nozzles fail, and the sinking arrangement of the nozzles prevents scouring and wear of the support beam and the main mother pipe, greatly improving the operating stability and reliability of the spraying device.

[0029] 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 belongs to the protection scope of the present invention.

Claims

1. A desulfurization slurry spraying device, consisting of two or more spraying layers, which are arranged in sequence from top to bottom in the desulfurization tower, characterized in that: The spray layer comprises a main mother pipe (1), a support beam (2), a secondary mother pipe (3), a branch pipe (4), a first nozzle (5) and a second nozzle (6); the main mother pipe (1) is supported by the support beam (2); both ends of the support beam (2) are fixed on the tower wall (7) of the desulfurization tower; the two sides of the main mother pipe (1) are connected to a plurality of secondary mother pipes (3); the two sides of the secondary mother pipe (3) are connected to a plurality of branch pipes (4); the branch pipes (4) are not terminated with nozzles; the nozzles comprise a first nozzle (5) or a second nozzle (6); two adjacent spray layers consist of an upper spray layer (9) and a lower spray layer (8); a top view of the main mother pipe (1) of the lower spray layer (8) and the main mother pipe (1) of the upper spray layer (9) The projection has an angle β. When viewed from top to bottom, the angle β between the main main pipe (1) of the lower spray layer (8) and the main main pipe (1) of the upper spray layer (9) is 360 / (number of nozzles in edge area A)×(n+0.5), where n is a natural number of 1 to 4. The nozzles are arranged in two areas in the desulfurization tower, including the edge area A and the center area B. The first nozzle (5) is arranged in the center area B. The spacing length d between two adjacent first nozzles (5) is the same, and d is not greater than 1100 mm. The second nozzle (6) is arranged in the edge area A. The arrangement trajectory of the second nozzle (6) is a distribution circle, and the diameter of the distribution circle is 1000 to 1200 mm smaller than the inner diameter of the tower wall (7) of the desulfurization tower.

2. A desulfurization slurry spraying device according to claim 1, characterized in that: The central area B is a circular area, the diameter of which is smaller than the diameter of the cross-sectional circle of the tower wall (7) of the desulfurization tower, and the edge area A is an annular area formed by removing the central area B from the inner cross-sectional area of ​​the tower wall (7) of the desulfurization tower.

3. A desulfurization slurry spraying device according to claim 1, characterized in that: The first nozzle (5) is a unidirectional 120-degree hollow cone spray nozzle, and the second nozzle (6) is a unidirectional 90-degree solid cone spray nozzle.

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