Off-line drying device in solid wet desulfurizing agent tower

Abstract

The utility model discloses an off-line drying device in a solid wet desulfurizing agent tower, which is applied to a desulfurizing tower, a solid desulfurizing agent is arranged in the desulfurizing tower, the bottom of the desulfurizing tower is connected with a tower inlet pipeline, and the top of the desulfurizing tower is connected with a tower top bleeder; the off-line drying device in the solid wet desulfurizer tower comprises a gas heater, the gas heater is connected with a gas inlet pipeline, a gas outlet pipeline, a steam inlet pipeline and a steam outlet pipeline, a cold channel and a hot channel for heat exchange are arranged in the gas heater, and the gas inlet pipeline, the cold channel and the gas outlet pipeline are sequentially communicated. The steam inlet pipeline, the heat channel and the steam outlet pipeline are sequentially communicated; the gas outlet pipeline is communicated with the tower inlet pipeline; the gas inlet pipeline is used for inputting inert gas, and the inert gas is gas which does not chemically react with the solid desulfurizing agent. The problem that the wet material desulfurization capacity is reduced is solved through the device, loading and unloading of a desulfurizing agent are not involved, and drying operation is directly carried out in the tower on site.

Description

Technical Field

[0001] The utility model relates to the technical field of material drying, in particular to an off-line drying device in a solid wet desulfurizing agent tower. Background Art

[0002] Coke oven gas uses iron oxide solid desulfurizer to complete the fine desulfurization of coke oven gas on an axial fixed bed, which is widely used in steel plants. However, due to the close location of the fine desulfurization tower to the coking area, the coke oven gas contains water, and the large temperature difference between the day and night environment inside and outside the desulfurization tower in winter, the wet tower wall condensation phenomenon is formed, which will cause the desulfurizer near the inner wall of the desulfurization tower to be wet, affecting the desulfurization effect.

[0003] If the desulfurizer is removed and replaced, it will cause great economic losses. At the same time, the used desulfurizer is classified as hazardous waste in the industry and is difficult to handle. Utility Model Content

[0004] In order to solve the above problems, the present application provides an off-line drying device for a solid wet desulfurizer tower.

[0005] The present application provides an off-line drying device for a solid wet desulfurizer in a tower, which is applied to a desulfurization tower. The solid desulfurizer is installed in the desulfurization tower. The desulfurization tower is connected to a tower inlet pipe at the bottom of the tower, and a tower top vent pipe is connected to the top of the tower. The off-line drying device for a solid wet desulfurizer in a tower comprises a gas heater. The gas heater is connected to a gas inlet pipe, a gas outlet pipe, a steam inlet pipe and a steam outlet pipe. A cold channel and a hot channel for heat exchange are provided in the gas heater. The gas inlet pipe, the cold channel and the gas outlet pipe are connected in sequence. The steam inlet pipe, the hot channel and the steam outlet pipe are connected in sequence. The gas outlet pipe is connected to the tower inlet pipe. The gas inlet pipe is used to input an inert gas, which is a gas that does not chemically react with the solid desulfurizer.

[0006] In some embodiments, the offline drying device in the solid wet desulfurizer tower also includes a drying tail gas delivery pipeline and a coking area coke oven gas purification negative pressure pipeline, and the tower top vent pipe, the drying tail gas delivery pipeline and the coking area coke oven gas purification negative pressure pipeline are connected in sequence.

[0007] In some embodiments, the solid wet desulfurizer tower offline drying device also includes a vent pipe cut-off valve group and a vent pipe check valve, and the tower top vent pipe, the vent pipe cut-off valve group, the vent pipe check valve and the drying exhaust gas delivery pipeline are connected in sequence.

[0008] In some embodiments, the steam inlet conduit is connected to the top of the gas heater and the steam outlet conduit is connected to the bottom of the gas heater.

[0009] In some embodiments, the gas inlet pipe is connected to the lower part of the gas heater, and the gas outlet pipe is connected to the upper part of the gas heater.

[0010] In some embodiments, the gas inlet pipe is installed with a first valve, the gas outlet pipe is installed with a second valve, the steam inlet pipe is installed with a third valve, and the steam outlet pipe is installed with a fourth valve.

[0011] In some embodiments, a blind plate valve and a butterfly valve are installed on the tower inlet pipe. The blind plate valve is closer to the bottom of the desulfurization tower than the butterfly valve on the tower inlet pipe. The connection point between the gas outlet pipe and the tower inlet pipe is located between the blind plate valve and the bottom of the desulfurization tower on the tower inlet pipe.

[0012] In some embodiments, the desulfurization tower is provided with an external insulation layer outside the tower body, and the external insulation layer is arranged around the tower body of the desulfurization tower.

[0013] In some embodiments, the coking area coke oven gas purification negative pressure pipeline is installed with a coking area coke oven gas purification booster fan.

[0014] In some embodiments, the inert gas is nitrogen.

[0015] The beneficial effects of the present application are as follows: Regarding a desulfurization tower for fine desulfurization of coke oven gas, a solid desulfurizer is installed in the desulfurization tower, the desulfurization tower is connected to a tower inlet pipeline at the bottom of the tower, and the desulfurization tower is connected to a tower top vent pipe at the top of the tower. The present application provides an off-line drying device for a solid wet desulfurizer in a tower. Aiming at the problem that the solid desulfurizer in the tower is in a wet state near the inner wall of the tower, the device includes a gas heater, the gas heater is connected to a gas inlet pipeline, a gas outlet pipeline, a steam inlet pipeline and a steam outlet pipeline, and the gas inlet pipeline is limited to inputting a gas that does not interact with the solid desulfurizer. Inert gas for chemical reaction; the inert gas is heated by the gas heater, enters the tower inlet pipe from the gas outlet pipe, dries the solid desulfurizer in the tower and is discharged from the vent pipe on the top of the tower; this device adopts the process of inert gas heating and drying, which solves the problem of reduced desulfurization capacity of wet materials, and does not involve loading and unloading of desulfurizers. It directly dries the wet materials on site in the tower, reduces the loss of wet material replacement, and reduces the operating cost of wet material out of the tower. After the wet materials are dried, they can still meet the corresponding desulfurization technical conditions. Since the wet materials are processed in the tower, the process will not cause pollution to the environment, which is safe and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model.

[0017] Figure 1This is a schematic structural diagram of an off-line drying device in a solid wet desulfurizer tower provided in this application.

[0018] Figure markings: 1-gas inlet pipeline, 2-first valve, 3-gas heater, 4-gas outlet pipeline, 5-second valve, 6-third valve, 7-steam inlet pipeline, 8-steam outlet pipeline, 9-fourth valve, 10-tower inlet pipeline, 11-blind plate valve, 12-butterfly valve, 13-desulfurization tower, 14-solid desulfurizer, 15-outer insulation layer of the tower, 16-tower top vent pipe, 17-vent pipe cut-off valve group, 18-vent pipe check valve, 19-drying tail gas transportation pipeline, 20-coking area coke oven gas purification negative pressure pipeline, 21-coking area coke oven gas purification booster fan. DETAILED DESCRIPTION

[0019] For details about the desulfurization tower that performs fine desulfurization of coke oven gas, please refer to Figure 1 A solid desulfurizer is installed in the desulfurization tower. The solid desulfurizer is arranged along the transverse section of the desulfurization tower as a whole. The solid desulfurizer is connected to the desulfurization tower through corresponding components in the tower. The desulfurization tower is connected to a tower inlet pipe at the bottom of the tower, and a tower top vent pipe is connected to the top of the desulfurization tower.

[0020] Since the fine desulfurization tower is close to the coking area, there is water in the coke oven gas, and the temperature difference between the inside and outside of the desulfurization tower is large during the day and night in winter, condensation occurs on the wet tower wall, which will cause the desulfurizer near the inner wall of the desulfurization tower to become wet, affecting the desulfurization effect. If the desulfurizer is removed and replaced, it will cause great economic losses. At the same time, the used desulfurizer is considered as hazardous waste in the industry, which is difficult to handle.

[0021] In order to solve the above problems, the present application provides an off-line drying device for a solid wet desulfurizer tower, which is specifically applied to the desulfurization tower 13. Figure 1 The device includes a gas heater 3, which is connected to a gas inlet pipe 1, a gas outlet pipe 4, a steam inlet pipe 7 and a steam outlet pipe 8. A cold channel and a hot channel for heat exchange are provided in the gas heater 3. The gas inlet pipe 1, the cold channel and the gas outlet pipe 4 are connected in sequence, and the steam inlet pipe 7, the hot channel and the steam outlet pipe 8 are connected in sequence. In the gas heater 3, the cold channel and the hot channel perform heat exchange to heat the gas input from the gas inlet pipe 1. The gas outlet pipe 4 is connected to the tower inlet pipe 10, and the heated gas is input into the tower inlet pipe 10 through the gas outlet pipe 4.

[0022] The gas inlet pipe 1 is used to input inert gas, which is a gas that does not chemically react with the solid desulfurizer 14. The heated inert gas is input into the tower inlet pipe 10 through the gas outlet pipe 4 to dry the solid desulfurizer 14 in the tower. After drying, the inert gas is discharged from the tower top vent pipe 16.

[0023] As mentioned above, this device adopts the process of inert gas heating and drying, which solves the problem of reduced desulfurization capacity of wet materials, and does not involve loading and unloading of desulfurizers. It directly dries the materials on site in the tower, reducing the loss of wet material replacement and the operating cost of wet material out of the tower.

[0024] After the wet material is dried, the corresponding desulfurization technical conditions can still be met. Since the wet material is processed in the tower, the process will not cause pollution to the environment, which is safe and environmentally friendly.

[0025] Regarding the inert gas, pure nitrogen can be used to facilitate subsequent discharge and treatment.

[0026] In some embodiments, see Figure 1 The desulfurization tower 13 is provided with an outer insulation layer 15 outside the tower body, the outer insulation layer 15 surrounds the tower body of the desulfurization tower 13, and the outer insulation layer 15 is connected to the desulfurization tower 13 through corresponding components of the tower outer wall. By providing the outer insulation layer 15, the heat dissipation of the tower can be reduced, the amount of dry gas can be saved, and the condensation phenomenon on the inner wall of the tower caused by the day and night temperature difference in the environment can be reduced in winter, thereby reducing the risk of wet materials.

[0027] In some embodiments, see Figure 1 The gas inlet pipeline 1 is installed with a first valve 2, the gas outlet pipeline 4 is installed with a second valve 5, the steam inlet pipeline 7 is installed with a third valve 6, and the steam outlet pipeline 8 is installed with a fourth valve 9. Each valve controls the on-off of each pipeline accordingly, thereby controlling whether the gas heater 3 is in a working state or a non-working state.

[0028] In some embodiments, see Figure 1 The steam inlet pipe 7 is connected to the top of the gas heater 3, and the steam outlet pipe 8 is connected to the bottom of the gas heater 3. After the cold channel and the hot channel perform heat exchange, the steam will condense to form condensed water, and the condensed water will be discharged from the steam outlet pipe 8.

[0029] In some embodiments, see Figure 1 The gas inlet pipe 1 is connected to the lower part of the gas heater 3, and the gas outlet pipe 4 is connected to the higher part of the gas heater 3. The lower part of the gas heater 3 and the higher part of the gas heater 3 are relative, and refer to the relatively lower part of the gas heater 3 and the relatively higher part of the gas heater 3, respectively. Through this arrangement, the flow direction of the fluid in the cold channel of the gas heater 3 is opposite to the flow direction of the fluid in the hot channel, which is convenient for increasing the heat exchange efficiency.

[0030] In some embodiments, see Figure 1 The tower inlet pipeline 10 is installed with a blind plate valve 11 and a butterfly valve 12, which are mainly used in the fine desulfurization process of the coke oven gas in the desulfurization tower 13. Figure 1 On the tower inlet pipeline 10 , the blind plate valve 11 is closer to the bottom of the desulfurization tower 13 than the butterfly valve 12 , and the connection point between the gas outlet pipeline 4 and the tower inlet pipeline 10 is located between the blind plate valve 11 and the bottom of the desulfurization tower 13 on the tower inlet pipeline 10 .

[0031] In some embodiments, see Figure 1 The off-line drying device in the solid wet desulfurizer tower also includes a drying tail gas conveying pipeline 19 and a coking area coke oven gas purification negative pressure pipeline 20. The tower top vent pipe 16, the drying tail gas conveying pipeline 19 and the coking area coke oven gas purification negative pressure pipeline 20 are connected in sequence. The drying tail gas after wet material desulfurization is sent to the coking area coke oven gas purification negative pressure pipeline 20 through the drying tail gas conveying pipeline 19. At this point, the wet desulfurizer drying process is completed.

[0032] In some embodiments, the coking area coke oven gas purification negative pressure pipeline 20 is installed with a coking area coke oven gas purification booster fan 21 .

[0033] In some embodiments, see Figure 1 The solid wet desulfurizer tower offline drying device also includes a vent pipe cut-off valve group 17 and a vent pipe check valve 18. The tower top vent pipe 16, the vent pipe cut-off valve group 17, the vent pipe check valve 18 and the drying tail gas delivery pipeline 19 are connected in sequence. The operation of the tower top vent pipe 16 is controlled by setting the vent pipe cut-off valve group 17 and the vent pipe check valve 18.

[0034] The inert gas is pure nitrogen, and the specific description is as follows: the pure nitrogen of 0.6-0.8Mpa at room temperature enters the gas heater 3 through the gas inlet pipe 1 and the first valve 2, and is heated in the gas heater 3. After the gas is heated, it enters the tower inlet pipe 10 through the gas outlet pipe 4 and the second valve 5, and then enters the tower from the bottom of the desulfurization tower 13 along the pipe. The hot nitrogen is evenly distributed in the tower and rises along the axial direction of the tower. When it encounters the solid desulfurizer 14 in a wet state filled in the tower, it heats and dries the wet desulfurizer. Finally, the heated wet nitrogen is discharged from the tower top vent pipe 16 through the sulfur agent tower. After being discharged, it passes through the vent pipe cut-off valve group 17, the vent pipe check valve 18, and the drying tail gas delivery pipe 19 in turn to enter the coke oven gas purification negative pressure pipe 20 in the coking area. At this point, the drying process of the wet desulfurizer is completed, the water content of the wet desulfurizer evaporates, and the wet desulfurizer is in a dry state.

[0035] The above operation must disconnect the desulfurization tower 13 to be dried from its production line, and all its inlet and outlet pipelines are cut off. The heating gas in this device is nitrogen, and the drying operation gas volume generally does not exceed 2000m3 / h. The operating temperature is controlled appropriately. The drying tail gas is sent to the coke oven gas purification system through a special pipeline, and its pipe diameter is selected according to the flow rate and the allowable pressure drop.

[0036] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0037] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A solid wet desulfurizer in-tower offline drying device, characterized in that: Applied to a desulfurization tower, a solid desulfurizer is installed in the desulfurization tower, a tower inlet pipeline is connected to the bottom of the desulfurization tower, and a tower top vent pipe is connected to the top of the desulfurization tower; The offline drying device in the solid wet desulfurizer tower comprises a gas heater, the gas heater is connected with a gas inlet pipe, a gas outlet pipe, a steam inlet pipe and a steam outlet pipe, a cold channel and a hot channel for heat exchange are arranged in the gas heater, the gas inlet pipe, the cold channel and the gas outlet pipe are connected in sequence, the steam inlet pipe, the hot channel and the steam outlet pipe are connected in sequence, and the gas outlet pipe is connected with the tower inlet pipe; The gas inlet pipe is used to input an inert gas, and the inert gas is a gas that does not chemically react with the solid desulfurizer.

2. The solid wet desulfurizer in-tower offline drying device according to claim 1, characterized in that: The solid wet desulfurizer tower offline drying device also includes a drying tail gas delivery pipeline and a coking area coke oven gas purification negative pressure pipeline. The tower top vent pipe, the drying tail gas delivery pipeline and the coking area coke oven gas purification negative pressure pipeline are connected in sequence.

3. The solid wet desulfurizer in-tower offline drying device according to claim 2, characterized in that: The solid wet desulfurizer tower offline drying device also includes a vent pipe cut-off valve group and a vent pipe check valve. The tower top vent pipe, the vent pipe cut-off valve group, the vent pipe check valve and the drying tail gas delivery pipeline are connected in sequence.

4. The solid wet desulfurizer in-tower offline drying device according to claim 1, characterized in that: The steam inlet pipe is connected to the top of the gas heater, and the steam outlet pipe is connected to the bottom of the gas heater.

5. The solid wet desulfurizer in-tower offline drying device according to claim 1, characterized in that: The gas inlet pipe is connected to the lower part of the gas heater, and the gas outlet pipe is connected to the upper part of the gas heater.

6. The solid wet desulfurizer in-tower offline drying device according to claim 1, characterized in that: The gas inlet pipeline is installed with a first valve, the gas outlet pipeline is installed with a second valve, the steam inlet pipeline is installed with a third valve, and the steam outlet pipeline is installed with a fourth valve.

7. The solid wet desulfurizer in-tower offline drying device according to claim 1, characterized in that: The tower inlet pipe is installed with a blind plate valve and a butterfly valve. On the tower inlet pipe, the blind plate valve is closer to the bottom of the desulfurization tower than the butterfly valve. The connection point between the gas outlet pipe and the tower inlet pipe is located between the blind plate valve and the bottom of the desulfurization tower on the tower inlet pipe.

8. The solid wet desulfurizer in-tower offline drying device according to claim 1, characterized in that: The desulfurization tower is provided with an external heat-insulating layer outside the tower body, and the external heat-insulating layer is arranged around the tower body of the desulfurization tower.

9. The solid wet desulfurizer in-tower offline drying device according to claim 2, characterized in that: The coking area coke oven gas purification negative pressure pipeline is installed with a coking area coke oven gas purification booster fan.

10. The solid wet desulfurizer in-tower offline drying device according to claim 1, characterized in that: The inert gas is nitrogen.

Images