Layered overflow pipe of desulfurizing tower

Abstract

The utility model discloses a desulfurizing tower layered overflow pipe which comprises a desulfurizing tower body, a first-stage overflow liquid inlet pipe, a second-stage overflow liquid inlet pipe and a third-stage overflow liquid inlet pipe are respectively connected with the desulfurizing tower body, an overflow confluence pipe comprises three horizontal pipe sections and a vertical pipe section, the side face of the vertical pipe section is communicated with the three horizontal pipe sections, and the vertical pipe section is communicated with the third-stage overflow liquid inlet pipe. The three horizontal pipe sections are respectively connected with a first-stage overflow liquid inlet pipe, a second-stage overflow liquid inlet pipe and a third-stage overflow liquid inlet pipe through a first-stage overflow valve, a second-stage overflow valve and a third-stage overflow valve, one end of a liquid sealing pipe is connected with an overflow converging pipe, and the other end of the liquid sealing pipe extends into a drainage ditch. One overflow pipe connector of a conventional overflow pipe is divided into three overflow pipe connectors, different substances in the desulfurizing tower are discharged in a layered mode through the low-layer overflow pipe, the middle-layer overflow pipe and the high-layer overflow pipe, the structure is simple and reliable, and operation is flexible and convenient.

Description

Technical Field

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

[0002] Wet desulfurization technology has become the most widely used desulfurization technology due to its high desulfurization efficiency, high absorbent utilization rate, strong adaptability to coal types and high reliability. When designing a wet desulfurization system, an overflow pipe is usually installed on the desulfurization tower to form a balance between the gas phase and the liquid phase in the desulfurization tower when the system is put into operation to achieve the best reaction conditions. The desulfurization tower is generally equipped with an overflow pipe interface, which is set below the normal liquid level. The overflow pipeline includes an ascending pipe, an exhaust port and a descending pipe, and is finally connected to the drainage ditch. This structure ensures the gas-liquid balance in the tower.

[0003] When the desulfurization system is operating normally, there are often some organic matter, wastewater, heavy metals and oil inside the desulfurization tower slurry pool. These impurities come from flue gas, slurry and process water. It is difficult for the desulfurization system to avoid the presence of impurities. When the impurities accumulate to a certain extent, they will be suspended in the slurry or float on the surface of the slurry, reducing the purity of the absorbent slurry, interfering with the reaction between the slurry and the flue gas, and ultimately affecting the desulfurization performance and the quality of by-products; on the other hand, impurities will cause the slurry in the desulfurization tower to bubble and overflow, resulting in a decrease in the liquid level of the desulfurization tower, affecting the desulfurization performance, and the overflow pipe interface is usually set below the normal liquid level. After overflow, the oil and foam floating on the surface of the slurry may still remain in the desulfurization tower, continuing to pose a hidden danger to the desulfurization system. Utility Model Content

[0004] The purpose of the utility model is to solve the problems in the prior art and to provide a desulfurization tower stratified overflow pipe which can solve the above problems.

[0005] To achieve the above-mentioned purpose, the utility model proposes a stratified overflow pipe of a desulfurization tower, comprising a desulfurization tower body, a first-level overflow liquid inlet pipe, a second-level overflow liquid inlet pipe, a third-level overflow liquid inlet pipe, a first-level overflow valve, a second-level overflow valve, a third-level overflow valve, an overflow converging pipe, a liquid seal pipe and a drainage ditch, wherein the first-level overflow liquid inlet pipe, the second-level overflow liquid inlet pipe and the third-level overflow liquid inlet pipe are respectively connected to the desulfurization tower body, the overflow converging pipe comprises three horizontal pipe sections and one vertical pipe section, the side of the vertical pipe section is connected with three horizontal pipe sections, the three horizontal pipe sections are respectively connected to the first-level overflow liquid inlet pipe, the second-level overflow liquid inlet pipe and the third-level overflow liquid inlet pipe through the first-level overflow valve, the second-level overflow valve and the third-level overflow valve, one end of the liquid seal pipe is connected to the overflow converging pipe, and the other end extends into the drainage ditch.

[0006] Preferably, the first-level overflow liquid inlet pipe, the second-level overflow liquid inlet pipe and the third-level overflow liquid inlet pipe are installed in horizontal layers, the first-level overflow liquid inlet pipe is set at a low position, the third-level overflow liquid inlet pipe is set at a high position, and the second-level overflow liquid inlet pipe is arranged in the middle, and the adjacent spacing is 200mm-800mm.

[0007] Preferably, the first-stage relief valve, the second-stage relief valve and the third-stage relief valve are all electric valves.

[0008] Preferably, the inlet of the first-level overflow valve is connected to the first-level overflow liquid inlet pipe, and the outlet is connected to the lower horizontal pipe section of the overflow merging pipe; the inlet of the second-level overflow valve is connected to the second-level overflow liquid inlet pipe, and the outlet is connected to the middle horizontal pipe section of the overflow merging pipe; the inlet of the third-level overflow valve is connected to the third-level overflow liquid inlet pipe, and the outlet is connected to the upper horizontal pipe section of the overflow merging pipe.

[0009] Preferably, the height of the first-level overflow liquid inlet pipe is lower than the normal desulfurization tower liquid level, and the height of the second-level overflow liquid inlet pipe is higher than the normal desulfurization tower liquid level.

[0010] Preferably, the liquid sealing pipe extends into the drainage ditch to a depth of 100 mm-200 mm.

[0011] Beneficial effects of the utility model: The utility model divides an overflow pipe interface of a conventional overflow pipe into three, and discharges different substances in the desulfurization tower in layers through the three-layer overflow pipe of low, medium and high. The structure is simple and reliable, and the operation is flexible and convenient. On the one hand, the present invention has less equipment, is easy to operate and maintain, has a stable and reliable structure, and is not easy to be damaged and cause system abnormalities; secondly, the overflow pipe connected to the desulfurization tower is set in three layers. During normal operation, impurities such as oil and foam can be discharged separately through the corresponding overflow pipelines as needed. Even if overflow occurs, impurities and foam will not be left in the desulfurization tower; at the same time, the three overflow valves with different installation heights also have the function of adjusting the liquid level, which is flexible to operate and ensures the optimal reaction conditions in the desulfurization tower.

[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 structural schematic diagram of the utility model.

[0014] In the figure: 1- desulfurization tower body, 2- first-stage overflow liquid inlet pipe, 3- second-stage overflow liquid inlet pipe, 4- third-stage overflow liquid inlet pipe, 5- first-stage overflow valve, 6- second-stage overflow valve, 7- third-stage overflow valve, 8- overflow confluence pipe, 9- liquid seal pipe, 10- drainage ditch. DETAILED DESCRIPTION

[0015] See also Figure 1A desulfurization tower layered overflow pipe comprises a desulfurization tower body 1, a primary overflow liquid inlet pipe 2, a secondary overflow liquid inlet pipe 3, a tertiary overflow liquid inlet pipe 4, a primary overflow valve 5, a secondary overflow valve 6, a tertiary overflow valve 7, an overflow confluence pipe 8, a liquid seal pipe 9 and a drain ditch 10. The primary overflow liquid inlet pipe 2, the secondary overflow liquid inlet pipe 3 and the tertiary overflow liquid inlet pipe 4 are connected to the desulfurization tower body 1, and the primary overflow liquid inlet pipe 2, the secondary overflow liquid inlet pipe 3 and the tertiary overflow liquid inlet pipe 4 are installed in layers horizontally, the primary overflow liquid inlet pipe 2 is arranged at a low position, the tertiary overflow liquid inlet pipe 4 is arranged at a high position, and the secondary overflow liquid inlet pipe 3 is arranged in the middle, and the heights are 200mm-800mm apart. The overflow confluence pipe 8 has three horizontal pipe sections and one vertical pipe section. The inlet of the primary overflow valve 5 is connected to the primary overflow liquid inlet pipe 2, and the outlet is connected to the lower horizontal pipe section of the overflow confluence pipe 8. The inlet of the secondary overflow valve 6 is connected to the secondary overflow liquid inlet pipe 3, and the outlet is connected to the middle horizontal pipe section of the overflow merging pipe 8. The inlet of the tertiary overflow valve 7 is connected to the tertiary overflow liquid inlet pipe 4, and the outlet is connected to the upper horizontal pipe section of the overflow merging pipe 8. The primary overflow valve 5, the secondary overflow valve 6 and the tertiary overflow valve 7 are electric valves, and the flow-through components are made of corrosion-resistant materials. One end of the liquid seal pipe 9 is connected to the overflow merging pipe 8, and the other end extends into the drain ditch 10. The depth of the liquid seal pipe 9 extending into the drain ditch 10 is 100mm-200mm. The height of the primary overflow liquid inlet pipe 2 is lower than the normal desulfurization tower liquid level, and the height of the secondary overflow liquid inlet pipe 3 is higher than the normal desulfurization tower liquid level.

[0016] When the desulfurization system operates normally, the first-level overflow valve 5 can be opened, and the slurry flows through the first-level overflow inlet pipe 2, the overflow merging pipe 8 and the liquid seal pipe 9. The setting of the liquid seal pipe 9 allows the entire overflow pipe structure to ensure the gas-liquid balance in the tower; when it is necessary to discharge impurities such as oil on the surface of the slurry in the desulfurization tower, the second-level overflow valve 6 can be opened, and the impurities flow through the second-level overflow inlet pipe 3, the overflow merging pipe 8 and the liquid seal pipe 9; when it is necessary to discharge the foam above the slurry, the third-level overflow valve 7 can be opened, and the foam flows through the third-level overflow inlet pipe 4, the overflow merging pipe 8 and the liquid seal pipe 9.

[0017] 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 desulfurization tower layered overflow pipe, characterized in that: The desulfurization tower comprises a tower body (1), a primary overflow liquid inlet pipe (2), a secondary overflow liquid inlet pipe (3), a tertiary overflow liquid inlet pipe (4), a primary overflow valve (5), a secondary overflow valve (6), a tertiary overflow valve (7), an overflow converging pipe (8), a liquid sealing pipe (9) and a drainage ditch (10), wherein the primary overflow liquid inlet pipe (2), the secondary overflow liquid inlet pipe (3) and the tertiary overflow liquid inlet pipe (4) are respectively connected to the tower body (1), and the overflow converging pipe (8) is connected to the desulfurization tower body (1). The pipe (8) comprises three horizontal pipe sections and one vertical pipe section. The side of the vertical pipe section is connected to the three horizontal pipe sections. The three horizontal pipe sections are respectively connected to the first overflow liquid inlet pipe (2), the second overflow liquid inlet pipe (3) and the third overflow liquid inlet pipe (4) through the first overflow valve (5), the second overflow valve (6) and the third overflow valve (7). One end of the liquid seal pipe (9) is connected to the overflow converging pipe (8), and the other end extends into the drainage ditch (10).

2. The desulfurization tower layered overflow pipe according to claim 1, characterized in that: The first-level overflow liquid inlet pipe (2), the second-level overflow liquid inlet pipe (3) and the third-level overflow liquid inlet pipe (4) are installed in layers horizontally, the first-level overflow liquid inlet pipe (2) is arranged at a low position, the third-level overflow liquid inlet pipe (4) is arranged at a high position, and the second-level overflow liquid inlet pipe (3) is arranged in the middle, and the adjacent spacing is 200mm-800mm.

3. The desulfurization tower layered overflow pipe according to claim 1, characterized in that: The first-stage overflow valve (5), the second-stage overflow valve (6) and the third-stage overflow valve (7) are all electric valves.

4. The desulfurization tower layered overflow pipe according to claim 1, characterized in that: The inlet of the first-stage overflow valve (5) is connected to the first-stage overflow liquid inlet pipe (2), and the outlet is connected to the lower horizontal pipe section of the overflow merging pipe (8); the inlet of the second-stage overflow valve (6) is connected to the second-stage overflow liquid inlet pipe (3), and the outlet is connected to the middle horizontal pipe section of the overflow merging pipe (8); the inlet of the third-stage overflow valve (7) is connected to the third-stage overflow liquid inlet pipe (4), and the outlet is connected to the upper horizontal pipe section of the overflow merging pipe (8).

5. The desulfurization tower layered overflow pipe according to claim 1, characterized in that: The height of the first-level overflow liquid inlet pipe (2) is lower than the normal desulfurization tower liquid level, and the height of the second-level overflow liquid inlet pipe (3) is higher than the normal desulfurization tower liquid level.

6. The desulfurization tower layered overflow pipe according to claim 1, characterized in that: The liquid sealing pipe (9) extends into the drainage ditch (10) to a depth of 100 mm to 200 mm.

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