Anti-blocking flushing system for wet desulphurization spraying layer

Abstract

The utility model discloses an anti-blocking flushing system for a wet desulphurization spray layer, which relates to the technical field of wet desulphurization, and comprises a spray tower, a flue gas inlet, a flue gas outlet and a slurry pond, the inner side of the spray tower is provided with a spray layer extending to the outer side, a desulfurization slurry circulating pump is mounted on a mounting plate on one side of the spray tower, and the desulfurization slurry circulating pump is communicated with the spray tower. Circulating pipelines connected with the spray tower and the spray layer are arranged at the two ends of the desulfurization slurry circulating pump, and a circulating pipeline manual valve is mounted on the inner side of one circulating pipeline. Through the arrangement of the flushing water pump, the flushing water electric valve and the flushing pipeline, after the desulfurization slurry circulating pump stops running, the circulating pipeline manual valve is closed, and the flushing water pump and the flushing water electric valve are opened, so that clean water from the process water tank enters the spraying layer through the flushing pipeline for flushing; therefore, slurry accumulated in the main pipe, the branch pipes and the nozzles of the spraying layer can be washed away, and the main pipe, the branch pipes and the nozzles of the spraying layer can be prevented from being blocked.

Description

Technical Field

[0001] The utility model relates to the technical field of wet desulfurization, in particular to a wet desulfurization spray layer anti-blocking flushing system. Background Technique

[0002] In wet desulfurization, flue gas enters from the middle of the absorption tower, and the desulfurization agent slurry is atomized and sprayed from the upper part of the absorption tower through a nozzle, contacting the flue gas countercurrently. CaSO3·1 / 2H2O and CO2 are generated in the tower, and the CaSO3·1 / 2H2O, O2, and H2O falling into the absorption tower slurry pool are further subjected to an oxidation reaction to obtain the by-product CaSO4·2H2O.

[0003] The spray layer is generally located in the upper middle part of the tower body. Through the slurry circulation pump, the slurry is evenly distributed to the flue gas layer to wash the flue gas and concentrate the slurry. It is the "heart" part of the entire desulfurization system. If the spray layer is blocked, the flow field will be uneven, forming a flue gas "corridor", and the flue gas cannot be completely and fully washed by the slurry, affecting the overall desulfurization efficiency.

[0004] During the maintenance of the wet desulfurization system, it is often found that the branch pipes and nozzles of the spray layer are blocked. After being blocked, the spray layer loses its function and has the following hazards:

[0005] Reduced desulfurization efficiency: If the spray layer is blocked, the flow field will be uneven, forming a flue gas "corridor", and the flue gas cannot be completely and fully washed by the slurry, affecting the overall desulfurization efficiency

[0006] Collapse of the spray layer: Currently, the pipelines of industrial spray layers are generally made of light materials such as fiberglass. Once the spray layer pipeline is blocked, it is extremely vulnerable to the "water hammer" effect of the start and stop of the circulation pump and breaks, resulting in local or overall collapse. After local fracture and collapse, due to the increase in the flow rate of the circulation pump, the current also increases, and the energy consumption during long-term operation increases, affecting the economic operation.

[0007] Vibration of the circulation pump pipeline: Generally, the desulfurization design of the circulating spray pipeline is a branch-mother pipe type. When the spray layer is blocked, the pipeline pressure resistance rises, the net positive suction head of the circulation pump increases, and in severe cases, the center of gravity of the circulation pump may shift, resulting in vibration or increased vibration of the entire pipeline, and even the overall collapse of the circulation pipeline.

[0008] Increased moisture content of gypsum and inability to dehydrate gypsum: Some of the flue gas is not fully washed due to the blockage of the spray layer, resulting in a decrease in desulfurization efficiency. In order to maintain the desulfurization efficiency and the SO2 value at the outlet of the clean flue gas, most commonly, the pH value is increased for compensation. The increase in pH deviates from the optimal oxidation pH value range, resulting in an increase in calcium bisulfite. The calcium bisulfite crystal clusters are open porous, sponge-like or needle-shaped, and the crystal clusters break into a "slurry state" under pressure.

[0009] Anti-corrosion of the absorption tower wall and metal fasteners: The flue gas is not fully sprayed and washed. The high-temperature flue gas directly contacts the tower wall and the clean flue, damaging the chemical properties and mechanical strength of the anti-corrosion layer. This causes the anti-corrosion layer of the tower wall, flue, and metal fasteners to fall off. (The industrial and mining environment is acidic and contains Cl- ions), so the "parent body" of the absorption tower is damaged by acid corrosion. Moreover, the fallen anti-corrosion fragments re-block the inlet screen of the circulation pump, forming a "blocked circulation". For example, due to the blockage of the spray layer, the tower wall temperature reaches as high as 90 °C, ultimately leading to the scrapping of the absorption tower.

[0010] Currently, the desulfurization system only sets process flushing water at the outlet section of the circulation pump. The flushing water only flushes the lower part of the circulation pipeline and cannot flush the main pipe and branch pipes of the spray layer. In response to this situation, a wet desulfurization spray layer anti-blocking flushing system is developed. Content of the utility model

[0011] Based on this, the purpose of the present utility model is to provide a wet desulfurization spray layer anti-blocking flushing system to solve the technical problems raised in the above background technology.

[0012] To achieve the above purpose, the present utility model provides the following technical solution: A wet desulfurization spray layer anti-blocking flushing system includes a spray tower, a flue gas inlet, an outlet, and a slurry pool. The inner side of the spray tower is provided with a spray layer extending to the outside. On the mounting plate on one side of the spray tower, a desulfurization slurry circulation pump is installed. Both ends of the desulfurization slurry circulation pump are provided with circulation pipelines connected to the spray tower and the spray layer. A manual valve for the circulation pipeline is installed inside one of the circulation pipelines.

[0013] On one side of the spray tower, a process water tank is provided. On the two mounting plates on the side of the process water tank close to the spray tower, flushing water pumps are installed. A flushing pipeline is connected between the flushing water pumps, the process water tank, and one of the circulation pipelines. A flushing water electric valve is installed inside the flushing pipeline.

[0014] Preferably, a flue gas inlet is provided on one side of the spray tower, and an outlet is provided above the flue gas inlet on one side of the spray tower.

[0015] Preferably, a filter plate is provided at the top end inside the spray tower, and a slurry pool is provided at the bottom end inside the spray tower.

[0016] Preferably, the other circulation pipeline communicates with the slurry pool.

[0017] Preferably, the spray layer is composed of a main pipe, branch pipes, and nozzles. The main pipe is disposed through the inside of the spray tower.

[0018] Preferably, branch pipes communicating with the main pipe are provided inside the spray tower, and nozzles are provided at the bottom ends of the branch pipes.

[0019] In summary, the utility model mainly has the following beneficial effects:

[0020] By arranging a flushing water pump, a flushing water electric valve and a flushing pipeline, after the desulfurization slurry circulating pump stops running, the manual valve of the circulating pipeline is closed, and the flushing water pump and the flushing water electric valve are opened, so that the clear water from the process water tank enters the spray layer through the flushing pipeline for flushing, in order to flush the slurry accumulated in the main pipe, branch pipes and nozzles of the spray layer clean, thereby preventing the main pipe, branch pipes and nozzles of the spray layer from being blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a three-dimensional structure schematic diagram of the utility model;

[0022] Figure 2 is a three-dimensional sectional view of the utility model;

[0023] Figure 3 is a three-dimensional structure schematic diagram of the spray layer of the utility model.

[0024] In the figure: 1, spray tower; 2, flue gas inlet; 3, outlet; 4, spray layer; 401, main pipe; 402, branch pipes; 403, nozzles; 5, desulfurization slurry circulating pump; 6, circulating pipeline; 7, manual valve of circulating pipeline; 8, flushing water electric valve; 9, flushing water pump; 10, process water tank; 11, slurry tank; 12, flushing pipeline. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present utility model, and should not be construed as a limitation of the present utility model.

[0026] The embodiments of the present utility model will be described below according to its overall structure.

[0027] A wet desulfurization spray layer anti-blocking flushing system, as Figure 1 、 Figure 2 and Figure 3As shown in the figure, it includes a spray tower 1, a flue gas inlet 2, an outlet 3 and a slurry pool 11. A spray layer 4 extending to the outside is arranged inside the spray tower 1. The spray layer 4 is composed of a main pipe 401, a branch pipe 402 and a nozzle 403. The main pipe 401 is arranged through the inside of the spray tower 1. Branch pipes 402 communicating with the main pipe 401 are arranged inside the spray tower 1. Nozzles 403 are arranged at the bottom ends of the branch pipes 402. A desulfurization slurry circulation pump 5 is installed on the mounting plate on one side of the spray tower 1. Circulation pipelines 6 connecting the spray tower 1 and the spray layer 4 are arranged at both ends of the desulfurization slurry circulation pump 5. A manual valve 7 for the circulation pipeline is installed inside one of the circulation pipelines 6. A flue gas inlet 2 is arranged on one side of the spray tower 1. An outlet 3 is arranged above the flue gas inlet 2 on one side of the spray tower 1. A slurry pool 11 is arranged at the bottom end inside the spray tower 1. The other circulation pipeline 6 communicates with the slurry pool 11;

[0028] Refer to Figure 1 , Figure 2 and Figure 3 It can be known that the flue gas enters through the flue gas inlet 2. At the same time, the desulfurization slurry circulation pump 5 operates and the manual valve 7 for the circulation pipeline is opened, so that the desulfurization slurry circulation pump 5 extracts the slurry inside the slurry pool 11 through the circulation pipeline 6 and sends it to the spray layer 4 through the circulation pipeline 6, so that the slurry can be sent to the branch pipe 402 through the main pipe 401 and then sent to the nozzle 403, so that it can be sprayed out through the nozzle 403, in order to spray and purify the flue gas with the slurry.

[0029] Refer to Figure 1 It can be known that a process water tank 10 is arranged on one side of the spray tower 1. Flushing water pumps 9 are installed on the two mounting plates on the side of the process water tank 10 close to the spray tower 1. A flushing pipeline 12 is connected between the flushing water pump 9, the process water tank 10 and one of the circulation pipelines 6. A flushing water electric valve 8 is installed inside the flushing pipeline 12;

[0030] Refer to Figure 1 , Figure 2 and Figure 3 It can be known that after the desulfurization slurry circulation pump 5 stops operating, the manual valve 7 for the circulation pipeline is closed, and the flushing water pump 9 and the flushing water electric valve 8 are opened, so that the clear water from the process water tank 10 enters the spray layer 4 through the flushing pipeline 12 for flushing, in order to flush the slurry accumulated in the main pipe 401, the branch pipe 402 and the nozzle 403 of the spray layer 4 clean, so that the main pipe 401, the branch pipe 402 and the nozzle 403 of the spray layer 4 can be prevented from being blocked.

[0031] Refer to Figure 2It can be seen that a filter plate is provided at the top inside the spray tower 1, which facilitates the filtration of the flue gas after spraying through the filter plate to achieve further purification treatment and improve the treatment effect of the flue gas.

[0032] The working principle of the present utility model is as follows: The wet desulfurization system is provided with multiple desulfurization slurry circulation pumps 5 and spray layers 4. After running for a period of time, one desulfurization slurry circulation pump 5 and spray layer 4 can be overhauled and flushed: In actual operation, the desulfurization slurry circulation pump 5 is stopped, and then the manual valve 7 of the circulation pipeline is closed, and the flushing water pump 9 and the flushing water electric valve 8 are opened, so that the clear water from the process water tank 10 enters the spray layer 4 through the flushing pipeline 12 for flushing, so as to flush the slurry accumulated in the main pipe 401, branch pipes 402 and nozzles 403 of the spray layer 4, thereby preventing the main pipe 401, branch pipes 402 and nozzles 403 of the spray layer 4 from being blocked. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0033] Although the embodiments of the present utility model have been shown and described, the specific embodiments are only explanations of the present utility model and not limitations thereof. The specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art can make modifications, substitutions and variations without creative contributions to the embodiments as needed, but as long as they are within the scope of the claims of the present utility model, they are protected by the patent law.

Claims

1. A wet desulfurization spray layer anti-blocking flushing system, comprising a spray tower (1), a flue gas inlet (2), an outlet (3) and a slurry pool (11), characterized in that: Inside the spray tower (1), there is a spray layer (4) extending to the outside. On the mounting plate on one side of the spray tower (1), a desulfurization slurry circulation pump (5) is installed. At both ends of the desulfurization slurry circulation pump (5), there are circulation pipes (6) connected to the spray tower (1) and the spray layer (4). Inside one of the circulation pipes (6), a manual valve for the circulation pipe (7) is installed. On one side of the spray tower (1), there is a process water tank (10). On the two mounting plates on the side of the process water tank (10) close to the spray tower (1), flushing water pumps (9) are installed. Between the flushing water pumps (9), the process water tank (10), and one of the circulation pipes (6), there is a flushing pipeline (12). Inside the flushing pipeline (12), an electric valve for flushing water (8) is installed.

2. The anti-blocking flushing system for the wet desulfurization spray layer according to claim 1, wherein: On one side of the spray tower (1), there is a flue gas inlet (2). Above the flue gas inlet (2) on one side of the spray tower (1), there is an outlet (3).

3. The anti-blocking flushing system for the wet desulfurization spray layer according to claim 1, characterized in that: At the top end inside the spray tower (1), there is a filter plate. At the bottom end inside the spray tower (1), there is a slurry pool (11).

4. The wet desulfurization spray layer anti-blocking flushing system according to claim 3, characterized in that: The other circulation pipe (6) communicates with the slurry pool (11).

5. The wet desulfurization spray layer anti-blocking flushing system according to claim 1, characterized in that: The spray layer (4) is composed of a main pipe (401), branch pipes (402), and nozzles (403). The main pipe (401) is disposed through the inside of the spray tower (1).

6. The anti-blocking flushing system for the wet desulfurization spray layer according to claim 5, wherein: Inside the spray tower (1), there are branch pipes (402) communicating with the main pipe (401). At the bottom end of the branch pipes (402), there are nozzles (403).

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