Overflow device of external liquid seal desulfurizing tower

Abstract

The utility model discloses an external liquid seal desulfurizing tower overflow device which comprises a desulfurizing tower main body, an inlet flue is connected onto the desulfurizing tower main body, an overflow port is arranged on the tower wall of the desulfurizing tower main body, the overflow port is connected with an overflow inclined pipe, an included angle alpha is formed between the overflow inclined pipe and the horizontal plane, the upper end of the overflow inclined pipe is connected with a discharge pipe, and the lower end of the discharge pipe is connected with a liquid outlet. The lower end of the discharge pipe is inserted into the liquid level of the liquid collecting pit, the liquid collecting pit is located on the lower portion of the discharge trench, and nozzles are arranged on the periphery of the bottom of the liquid collecting pit and connected with a process water pipe. The overflow device is simple in structure, the overflow inclined pipe is obliquely arranged without scaling, and the overflow device is maintenance-free; the overflow pipe is balanced with the pressure in the tower, and easy-to-bubble substances floating on the liquid level directly overflow and are discharged, so that the problem of bubble overflow of slurry is thoroughly solved, the field environment quality is improved, the labor intensity is reduced, and the material consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of tower overflow, in particular to the technical field of flue gas wet desulfurization tower. Background Art

[0002] At present, wet desulfurization technology is often used for sulfur dioxide purification of sulfur-containing flue gas. Since the flue gas after wet desulfurization is corrosive, the fan used to overcome the flue gas resistance is generally set in front of the desulfurization tower, and the desulfurization tower operates in a positive pressure state; the slurry pool at the bottom of the desulfurization tower is used for the dissolution of limestone and the oxidation of gypsum, and it needs to maintain a certain liquid level. The oxidation of gypsum requires air to be blown into the slurry pool. At the same time, impurities in the limestone raw materials and unburned materials in the flue gas will also enter the slurry pool and float on the surface of the slurry pool. After running for a period of time, foam is likely to appear above the controlled liquid level. In order to prevent foam and slurry from flowing back into the flue gas inlet of the desulfurization tower, a slurry pool overflow device is required. In order to prevent the overflow of positive pressure flue gas, the overflow interface of the overflow device is often set below the minimum allowable liquid level of the slurry pool, and then lead to the highest liquid point above the highest liquid point through the pipeline outside the tower, and then lead to the discharge ditch, and set a vent at the highest point of the pipeline to prevent siphoning.

[0003] As impurities and unburned materials enter the slurry pool, the slurry is prone to foaming. At the same time, as air is blown in, the existing overflow device technology, because the pressure on the liquid surface of the overflow pipe (equal to atmospheric pressure) is lower than the pressure on the liquid surface of the slurry in the tower (flue gas pressure), causes slurry foam to overflow from the overflow device easily, causing environmental pollution, waste of raw materials, and a large workload of manual cleaning. The patent with application number CN202220637495.9 discloses a defoaming device for the overflow pipe of a desulfurization tower. A first defoaming device is arranged above the water surface of the overflow pipe, and a second defoaming device is arranged at the lower end of the overflow pipe. The overflow rate is reduced by defoaming, but the substance causing foaming still accumulates in the tower, and the problem of foaming overflow is not fundamentally eliminated. At the same time, the defoaming process requires process water consumption; the patent with application number CN202222039396.3 discloses a baffle device for reducing bubbles in the overflow pipe of a desulfurization tower. A "C"-shaped baffle is arranged at the overflow port in the tower, and grilles are arranged on both sides of the "C"-shaped baffle, which reduces the bubbles entering the overflow pipe, thereby reducing overflow, but the substance causing foaming cannot be discharged. At the same time, gypsum scaling is easily formed at the lower part of the "C"-shaped baffle. Utility Model Content

[0004] The purpose of the utility model is to solve the problems in the prior art and to provide an external liquid-sealed desulfurization tower overflow device that can solve the above problems.

[0005] To achieve the above-mentioned purpose, the utility model proposes an overflow device for an external liquid-sealed desulfurization tower, comprising a desulfurization tower body, the desulfurization tower body is connected to an inlet flue, an overflow port is opened on the tower wall of the desulfurization tower body, the overflow port is connected to an overflow inclined pipe, the overflow inclined pipe forms an angle α with the horizontal plane, the upper end of the overflow inclined pipe is connected to a discharge pipe, the lower end of the discharge pipe is inserted into the liquid surface of a sump, the sump is located at the lower part of the discharge ditch, a nozzle is provided around the bottom of the sump, and the nozzle is connected to a process water pipe.

[0006] Preferably, the height of the overflow port is between the highest liquid level and the bottom plate of the inlet flue.

[0007] Preferably, the angle α is 15-60°.

[0008] Preferably, the height of the upper end of the discharge pipe is determined according to the overflow control height.

[0009] Preferably, the lower end of the discharge pipe is inserted 200-300 mm below the liquid level of the sump.

[0010] Preferably, the top of the sump is flush with the bottom of the discharge ditch.

[0011] The beneficial effects of the utility model are as follows: the utility model has a simple structure, the overflow inclined pipe is tilted and will not scale, and the overflow device is maintenance-free; the overflow pipe is pressure balanced with the tower, and the foaming substances floating on the liquid surface are directly discharged by the overflow, which completely solves the slurry foaming overflow problem, improves the on-site environmental quality, reduces labor intensity, and saves material consumption.

[0012] 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

[0013] Figure 1 It is a schematic diagram of the desulfurization tower overflow device of the utility model;

[0014] Figure 2 yes Figure 1 A-direction view.

[0015] In the figure: 1-inlet flue, 2-tower wall, 3-highest liquid level, 4-overflow port, 5-overflow inclined pipe, 6-discharge pipe, 7-discharge ditch, 8-liquid collection pit, 9-liquid level, 10-process water pipe, 11-nozzle. DETAILED DESCRIPTION

[0016] See also Figure 1 , Figure 2, an external liquid-sealed desulfurization tower overflow device, comprising a desulfurization tower body, the desulfurization tower body is connected to an inlet flue 1, an overflow port 4 is opened on the tower wall 2 of the desulfurization tower body, the overflow port 4 is connected to an overflow inclined pipe 5, the overflow inclined pipe 5 forms an angle α with the horizontal plane, the upper end of the overflow inclined pipe 5 is connected to a discharge pipe 6, the lower end of the discharge pipe 6 is inserted 200-300mm below the liquid level 9 of a collection pit 8, the collection pit 8 is located at the lower part of a discharge ditch 7, a nozzle 11 is provided around the bottom of the collection pit 8, the nozzle 11 is connected to a process water pipe 10, the height of the overflow port 4 is located between the highest liquid level 3 and the bottom plate of the inlet flue 1, the angle α is 15-60°, the upper end height of the discharge pipe 6 is determined according to the overflow control height, and the top of the collection pit 8 is flush with the bottom of the discharge ditch 7.

[0017] Working process of this utility model:

[0018] After the desulfurization tower has been running for a period of time, slurry foam (containing organic impurities) appears above the controlled liquid level, and the slurry foam enters the overflow inclined pipe 5 through the overflow port 4, and enters the discharge pipe 6 after passing through the high end of the overflow inclined pipe 5, and is discharged to the sump 8. The process water in the sump 8 performs an external liquid seal on the flue gas. When overflow occurs, the nozzle 11 at the bottom of the sump 8 starts to operate, flushing the slurry foam (containing organic impurities) into the ditch 7 for external discharge.

[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. An external liquid seal desulfurization tower overflow device, characterized in that: The invention comprises a desulfurization tower body, wherein the desulfurization tower body is connected to an inlet flue (1), an overflow port (4) is provided on a tower wall (2) of the desulfurization tower body, the overflow port (4) is connected to an overflow inclined pipe (5), the overflow inclined pipe (5) forms an angle α with a horizontal plane, the upper end of the overflow inclined pipe (5) is connected to a discharge pipe (6), the lower end of the discharge pipe (6) is inserted into the liquid surface of a liquid collection pit (8), the liquid collection pit (8) is located at the lower part of a discharge ditch (7), a nozzle (11) is provided around the bottom of the liquid collection pit (8), and the nozzle (11) is connected to a process water pipe (10).

2. The overflow device of the external liquid seal desulfurization tower according to claim 1, characterized in that: The overflow port (4) is located at a height between the highest liquid level (3) and the bottom plate of the inlet flue (1).

3. The overflow device of the external liquid seal desulfurization tower according to claim 1, characterized in that: The angle α is 15-60°.

4. The overflow device of the external liquid seal desulfurization tower according to claim 1, characterized in that: The height of the upper end of the discharge pipe (6) is determined according to the overflow control height.

5. The overflow device of the external liquid seal desulfurization tower according to claim 1, characterized in that: The lower end of the discharge pipe (6) is inserted 200-300 mm below the liquid level (9) of the sump (8).

6. The overflow device of the external liquid seal desulfurization tower according to claim 1, characterized in that: The top of the liquid collection pit (8) is flush with the bottom of the discharge ditch (7).

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