Desulfurization device for oil refinery

Abstract

The desulfurization device comprises a desulfurization cylinder and a lower header, the bottom end of the desulfurization cylinder is connected with a top opening of the lower header, and an inner cavity of the desulfurization cylinder is communicated with the top opening of the lower header; the lower header is internally provided with a buffer cavity, a flocculation cavity, a precipitation cavity, a PH adjusting cavity and a temporary storage cavity through which desulfurization waste liquid sequentially flows; the buffer cavity is located under the desulfurization cylinder, the flocculation cavity is located at the side part of the buffer cavity, and the precipitation cavity is located at the bottom of the flocculation cavity; the precipitation cavity is of a hopper-shaped structure, and a blow-off pipe communicated with the precipitation cavity is arranged at the bottom end of the precipitation cavity; the PH adjusting cavity is located at the side parts of the flocculation cavity and the precipitation cavity, and the temporary storage cavity is located at the bottom of the PH adjusting cavity. According to the desulfurization device provided by the utility model, the desulfurization waste liquid can be subjected to buffering, flocculation, precipitation, PH regulation and temporary storage treatment, so that the waste liquid is effectively treated and recycled, and the purpose of saving raw materials is achieved.

Description

Technical Field

[0001] The utility model relates to a desulfurization device for refineries, belonging to the technical field of desulfurization equipment. Background Art

[0002] During the production process of refineries, a lot of industrial waste gas is generated. The waste gas contains a large amount of sulfides. Direct emission will cause serious air pollution. Therefore, industrial waste gas needs to be treated by a desulfurization device before being discharged. In the desulfurization tower, the commonly used desulfurizer is acid solution. After being sprayed with industrial waste gas in the desulfurization tower, the sulfides react with the acid solution, thus realizing flue gas treatment.

[0003] At present, the waste liquid after desulfurization enters the aeration tank. The waste liquid in the aeration tank is mixed with the lime milk supplied into the aeration tank by a circulation pump and then made into desulfurization liquid again. However, in the existing desulfurization circulation system during use, there are problems such as incomplete removal of impurities and fluctuating pH values. The spray pipes and spray nozzles are prone to blockage, and even cause the system to shut down.

[0004] In summary, it is obvious that the existing technology has inconveniences and defects in actual use, so it is necessary to improve. Content of the Utility Model

[0005] Aiming at the deficiencies in the background art, the utility model provides a desulfurization device for refineries, which can buffer, flocculate, precipitate, adjust the pH value and temporarily store the desulfurization waste liquid, realize the effective treatment and reuse of the waste liquid, and achieve the purpose of saving raw materials.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions:

[0007] The desulfurization device for refineries includes a desulfurization cylinder and a lower header box. The bottom end of the desulfurization cylinder is connected to the top opening of the lower header box, and the inner cavities are connected; a buffer chamber, a flocculation chamber, a precipitation chamber, a pH adjustment chamber and a temporary storage chamber for the sequential flow of desulfurization waste liquid are arranged inside the lower header box; the buffer chamber is located directly below the desulfurization cylinder, the flocculation chamber is located on the side of the buffer chamber, and the precipitation chamber is located at the bottom of the flocculation chamber; the precipitation chamber is in a hopper-shaped structure, and a sewage discharge pipe is provided at the bottom end of the precipitation chamber and is connected to it; the pH adjustment chamber is located on the side of the flocculation chamber and the precipitation chamber, and the temporary storage chamber is located at the bottom of the pH adjustment chamber.

[0008] Further, a flue gas inlet pipe is installed at the bottom of the inner cavity of the desulfurization cylinder, and the outlet end of the flue gas inlet pipe is arranged upward.

[0009] Further, two-stage packing layers are installed in the middle of the inner cavity of the desulfurization cylinder, and spray pipes are respectively arranged above the two-stage packing layers.

[0010] Further, a demisting layer is installed at the top of the inner cavity of the desulfurization cylinder, and an air outlet is provided at the top end of the desulfurization cylinder.

[0011] Furthermore, an overflow gap is provided between the buffer chamber and the flocculation chamber.

[0012] Furthermore, a stirring mechanism is installed inside the flocculation chamber, and a flocculant dosing port is provided at the top of the flocculation chamber.

[0013] Furthermore, connecting pipes are provided between the sedimentation chamber and the flocculation chamber, between the pH adjustment chamber and the sedimentation chamber, and between the temporary storage chamber and the pH adjustment chamber, and solenoid valves are installed on the pipes.

[0014] Furthermore, one end of the blowdown pipe extends to the outside of the lower header, and a screw is installed inside the blowdown pipe.

[0015] Furthermore, a stirring mechanism is installed inside the pH adjustment chamber, and an acid-base dosing port is provided at the top of the pH adjustment chamber.

[0016] Furthermore, a desulfurization liquid replenishing pipe is provided on the side wall of the temporary storage chamber; a circulation pump is installed outside the temporary storage chamber, and the circulation pump is connected to the spray pipe through a lift pipe.

[0017] After the present utility model adopts the above technical solutions, compared with the prior art, it has the following advantages:

[0018] When the flue gas passes through the two-stage packing layer, harmful substances such as sulfur dioxide in the flue gas react with the desulfurization liquid to absorb it, and the absorbed desulfurization waste liquid enters the lower header for internal treatment and recycling;

[0019] The desulfurization waste liquid flows successively into the buffer chamber, the flocculation chamber, the sedimentation chamber, the pH adjustment chamber and the temporary storage chamber to realize effective treatment of buffering, flocculation, sedimentation, pH adjustment and temporary storage, and is pumped into the spray pipe through the circulation pump and the lift pipe for reuse, so as to achieve the purpose of saving raw materials.

[0020] The present utility model will be described in detail below with reference to the drawings and embodiments. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of the present utility model;

[0022] Figure 2 is a schematic internal structural diagram of the present utility model;

[0023] Figure 3 is a schematic internal structural diagram of the lower header.

[0024] In the figure, 1 - lower header, 11 - opening, 12 - buffer chamber, 13 - flocculation chamber, 14 - sedimentation chamber, 15 - pH adjustment chamber, 16 - temporary storage chamber, 17 - blowdown pipe, 18 - screw; 2 - desulfurization cylinder; 3 - circulation pump; 4 - lift pipe; 5 - spray pipe; 6 - packing layer; 7 - flue gas inlet pipe; 8 - demisting layer. Detailed implementation manners

[0025] For a clearer understanding of the technical features, objectives, and effects of the present utility model, the detailed implementation manners of the present utility model will now be described with reference to the accompanying drawings.

[0026] As Figures 1 - 3 collectively shown, the present utility model provides a desulfurization device for a refinery, including a desulfurization cylinder 2 and a lower header tank 1. The bottom end of the desulfurization cylinder 2 is connected to the top opening 11 of the lower header tank 1, and the inner cavities are in communication.

[0027] A flue gas inlet pipe 7 is installed at the bottom of the inner cavity of the desulfurization cylinder 2, and the outlet end of the flue gas inlet pipe 7 is arranged upward.

[0028] Two - stage packing layers 6 are installed in the middle of the inner cavity of the desulfurization cylinder 2, and spray pipes 5 are respectively arranged above the two - stage packing layers 6.

[0029] A demisting layer 8 is installed at the top of the inner cavity of the desulfurization cylinder 2, and an air outlet is provided at the top end of the desulfurization cylinder 2.

[0030] A buffer cavity 12, a flocculation cavity 13, a sedimentation cavity 14, a pH adjustment cavity 15, and a temporary storage cavity 16 for the sequential flow of desulfurization waste liquid are provided inside the lower header tank 1, for sequentially buffering, flocculating, sedimenting, adjusting the pH, and temporarily storing the waste liquid, so as to realize the treatment and reuse of the desulfurization waste liquid.

[0031] The buffer cavity 12 is located directly below the desulfurization cylinder 2, the flocculation cavity 13 is located on the side of the buffer cavity 12, and an overflow gap is provided between the buffer cavity 12 and the flocculation cavity 13. The desulfurization waste liquid overflows from the buffer cavity 12 into the flocculation cavity 13.

[0032] A stirring mechanism is installed inside the flocculation cavity 13, and a flocculant dosing port is provided at the top of the flocculation cavity 13. The desulfurization waste liquid and the flocculant are mixed evenly under the action of the stirring mechanism to achieve flocculation.

[0033] The sedimentation cavity 14 is located at the bottom of the flocculation cavity 13, and a connecting pipe is provided between the sedimentation cavity 14 and the flocculation cavity 13, and a solenoid valve is installed on the pipe.

[0034] The sedimentation cavity 14 has a hopper - shaped structure, and a sewage discharge pipe 17 is provided at the bottom end of the sedimentation cavity 14, and one end of the sewage discharge pipe 17 extends to the outside of the lower header tank 1. A screw 18 is installed inside the sewage discharge pipe 17, and the screw 18 is used to regularly discharge the sediment sludge.

[0035] The pH adjustment cavity 15 is located on the side of the flocculation cavity 13 and the sedimentation cavity 14. A connecting pipe is provided between the pH adjustment cavity 15 and the sedimentation cavity 14, and a solenoid valve is installed on the pipe. The waste liquid after sedimentation enters the pH adjustment cavity 15 through the connecting pipe.

[0036] A stirring mechanism is installed inside the pH adjustment chamber 15. An acid-base dosing port is provided at the top of the pH adjustment chamber 15. The wastewater and the acid-base dosing agent are mixed evenly under the action of the stirring mechanism to adjust the pH value of the waste liquid.

[0037] The temporary storage chamber 16 is located at the bottom of the pH adjustment chamber 15. A connecting pipe is provided between the temporary storage chamber 16 and the pH adjustment chamber 15, and a solenoid valve is installed on the pipe. A desulfurization liquid replenishing pipe is provided on the side wall of the temporary storage chamber 16. A circulation pump 3 is installed outside the temporary storage chamber 16, and a lifting pipe 4 is provided between the circulation pump 3 and the spray pipe 5.

[0038] The specific working principle of the present utility model is as follows:

[0039] The dust-containing and sulfur-containing gas flow enters the bottom of the inner cavity of the desulfurization cylinder 2 from the flue gas inlet pipe 7 and flows upward; the desulfurization liquid is sprayed from the spray pipe 5 onto the packing layer 6 to form a desulfurization liquid film. When the flue gas passes through the packing layer 6, harmful substances such as sulfur dioxide react with the desulfurization liquid and are absorbed. The absorbed desulfurization waste liquid enters the lower header 1 for internal treatment and recycling.

[0040] The desulfurization waste liquid flows successively into the buffer chamber 12, the flocculation chamber 13, the precipitation chamber 14, the pH adjustment chamber 15, and the temporary storage chamber 16 to achieve buffering, flocculation, precipitation, pH adjustment, and temporary storage, realizing effective treatment of the waste liquid. Then, it is pumped into the spray pipe 5 for reuse through the circulation pump 3 and the lifting pipe 4, which can achieve the purpose of saving raw materials.

[0041] The above is an example of the best implementation mode of the present utility model. The parts not described in detail are all common general knowledge of those skilled in the art. The protection scope of the present utility model shall be subject to the content of the claims, and any equivalent transformation based on the technical inspiration of the present utility model is also within the protection scope of the present utility model.

Claims

1. A refinery desulfurization device, characterized in that: It includes a desulfurization cylinder (2) and a lower header (1). The bottom end of the desulfurization cylinder (2) is connected to the top opening (11) of the lower header (1), and their inner cavities are in communication. Inside the lower header (1), there are a buffer chamber (12), a flocculation chamber (13), a sedimentation chamber (14), a pH adjustment chamber (15), and a temporary storage chamber (16) for the sequential flow of desulfurization waste liquid. The buffer chamber (12) is directly below the desulfurization cylinder (2), the flocculation chamber (13) is on the side of the buffer chamber (12), and the sedimentation chamber (14) is at the bottom of the flocculation chamber (13). The sedimentation chamber (14) is in a hopper-shaped structure, and a drain pipe (17) is provided at the bottom end of the sedimentation chamber (14) and is in communication with it. The pH adjustment chamber (15) is on the side of the flocculation chamber (13) and the sedimentation chamber (14), and the temporary storage chamber (16) is at the bottom of the pH adjustment chamber (15).

2. The refinery desulfurization device according to claim 1, characterized in that: A flue gas inlet pipe (7) is installed at the bottom of the inner cavity of the desulfurization cylinder (2), and the outlet end of the flue gas inlet pipe (7) is set upward.

3. The refinery desulfurization device according to claim 2, characterized in that: Two-stage packing layers (6) are installed in the middle of the inner cavity of the desulfurization cylinder (2), and spray pipes (5) are respectively provided above the two-stage packing layers (6).

4. The refinery desulfurization device according to claim 3, characterized in that: A demisting layer (8) is installed at the top of the inner cavity of the desulfurization cylinder (2), and an air outlet is provided at the top end of the desulfurization cylinder (2).

5. The refinery desulfurization device according to claim 1, characterized in that: An overflow gap is provided between the buffer chamber (12) and the flocculation chamber (13).

6. The refinery desulfurization device according to claim 1, characterized in that: A stirring mechanism is installed inside the flocculation chamber (13), and a flocculant dosing port is provided at the top of the flocculation chamber (13).

7. The refinery desulfurization device according to claim 1, characterized in that: Connecting pipes are provided between the sedimentation chamber (14) and the flocculation chamber (13), between the pH adjustment chamber (15) and the sedimentation chamber (14), and between the temporary storage chamber (16) and the pH adjustment chamber (15), and solenoid valves are installed on the pipes.

8. The refinery desulfurization device according to claim 1, characterized in that: One end of the drain pipe (17) extends to the outside of the lower header (1), and a screw rod (18) is installed inside the drain pipe (17).

9. The refinery desulfurization device according to claim 1, wherein: A stirring mechanism is installed inside the pH adjustment chamber (15), and an acid-base dosing port is provided at the top of the pH adjustment chamber (15).

10. The refinery desulfurization device according to claim 1, characterized in that: A desulfurization liquid supply pipe is provided on the side wall of the temporary storage chamber (16). A circulation pump (3) is installed outside the temporary storage chamber (16), and the circulation pump (3) is connected to the spray pipe (5) through a lifting pipe (4).

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