A kind of anti-blocking system for high-concentration waste liquid rectification column reboiler

Abstract

The utility model discloses a kind of high-concentration waste liquid rectifying column reboiler is used to prevent blocking system, it is related to polysilicon production technical field, including reboiler and rectifying column, reboiler and rectifying column are connected by circulation pipe, circulation pipe is connected with outer discharge pipe, outer discharge pipe is connected with evaporation concentration tank, evaporation concentration tank, cooling agitator tank, settling tank and filter are sequentially connected;High-concentration waste liquid is concentrated in rectifying column, and then is discharged into evaporation concentration tank through outer discharge pipe, is concentrated again in evaporation concentration tank, and then is discharged into cooling agitator tank through first discharge pipe, is crystallized and separated out in cooling agitator tank, and then is discharged into settling tank through second discharge pipe, after settling in settling tank, clear liquid is discharged into filter through clear liquid pipe;Waste residue in settling tank and filter is discharged into hydrolysis tank for hydrolysis treatment through first waste residue discharge pipe and second waste residue discharge pipe respectively.The utility model can effectively prevent reboiler from blocking.

Description

Technical Field

[0001] This utility model belongs to the field of polysilicon production technology, specifically relating to an anti-clogging system for a reboiler in a high-concentration waste liquid distillation tower. Background Technology

[0002] Polycrystalline silicon is a form of elemental silicon. When molten elemental silicon solidifies under supercooled conditions, silicon atoms arrange themselves into many crystal nuclei in the form of a diamond lattice. If these crystal nuclei grow into grains with different crystal orientations, these grains combine to crystallize into polycrystalline silicon.

[0003] High-boiling polycrystalline silicon substances refer to substances with boiling points exceeding those of silicon tetrachloride, including various metal chlorides, silicon compounds containing carbon and oxygen atoms, and polysilicon silanes. These substances are not easily volatile, easily form scale, and can produce hydrochloric acid mist in high-humidity environments.

[0004] In existing technologies, approximately 150 kg of high-boiling-point substances (mixed slurry containing polymers) are generated for every ton of polysilicon produced. These high-boiling-point substances are primarily composed of aluminum trichloride, which is difficult to separate from hexachlorodisilane, resulting in catalyst failure.

[0005] Chinese patent CN217661586U, published on 2022-10-28, discloses a polycrystalline silicon high-boiling-point separation system, including a first settling tank, a first filter, a distillation column, a first cooling and stirring tank, a second settling tank, a second filter, and a cracking reactor. The supernatant outlet of the first settling tank is connected to the inlet of the first filter via a pipeline. The outlet of the first filter is connected to the inlet of the distillation column via a pipeline. The reboiler of the distillation column is connected to the inlet of the first cooling and stirring tank via a pipeline. The outlet of the first cooling and stirring tank is connected to the inlet of the second settling tank via a pipeline. The supernatant outlet of the second settling tank is connected to the inlet of the second filter via a pipeline. The outlet of the second filter is connected to the inlet of the cracking reactor via a pipeline. In this separation system, the reboiler tubes of the distillation column are prone to clogging. Utility Model Content

[0006] The purpose of this invention is to solve the problems of existing technologies and provide an anti-clogging system for reboilers in high-concentration waste liquid distillation columns. After concentration in the distillation column, the high-concentration waste liquid is discharged into an evaporation and concentration tank through an external discharge pipe. After further concentration in the evaporation and concentration tank, it is discharged into a cooling and stirring tank through a first discharge pipe. Crystallization occurs in the cooling and stirring tank, and the precipitated waste liquid is discharged into a settling tank through a second discharge pipe. After settling in the settling tank, the clarified liquid is discharged into a filter through a clarified liquid pipe. The waste residue in the settling tank and the filter is discharged into a hydrolysis tank for hydrolysis treatment through a first slag discharge pipe and a second slag discharge pipe, respectively. This invention effectively prevents reboiler clogging.

[0007] This utility model is achieved through the following technical solution: An anti-clogging system for a reboiler in a high-concentration waste liquid distillation column includes a reboiler and a distillation column, which are connected by a circulation pipe. The circulation pipe is connected to an external discharge pipe, which is connected to an evaporation and concentration tank. The evaporation and concentration tank is equipped with a first discharge pipe and a first discharge pipe. The first discharge pipe is connected to a cooling and stirring tank. The cooling and stirring tank is equipped with a second discharge pipe and a second discharge pipe. The second discharge pipe is connected to a settling tank. The settling tank is equipped with a first slag discharge pipe and a clear liquid pipe. The clear liquid pipe is connected to a filter. The filter is equipped with a product liquid discharge pipe and a second slag discharge pipe. The first slag discharge pipe and the second slag discharge pipe are connected to a hydrolysis tank.

[0008] Preferably, the distillation column is equipped with a liquid level control unit, which includes a first liquid level gauge installed on the distillation column and a flow regulating valve installed on the outflow pipe.

[0009] Preferably, the evaporation and concentration tank is provided with a first pressure control unit, which includes a first pressure gauge provided on the evaporation and concentration tank and a first venting regulating valve provided on the first discharge pipe.

[0010] Preferably, the cooling mixing tank is provided with a second pressure control unit, which includes a second pressure gauge provided on the cooling mixing tank and a second venting regulating valve provided on the second discharge pipe.

[0011] Preferably, the evaporation and concentration tank is provided with a first heat exchange jacket; the first heat exchange jacket is provided with a steam inlet pipe and a condensate outlet pipe.

[0012] Preferably, the cooling mixing tank is provided with a second heat exchange jacket; the second heat exchange jacket is provided with a circulating water inlet pipe and a circulating water outlet pipe.

[0013] Preferably, the settling tank is equipped with a second level gauge.

[0014] Preferably, the first discharge pipe is equipped with a heat tracing jacket and a first fault-close valve. The heat tracing jacket is equipped with a steam inlet pipe and a condensate outlet pipe.

[0015] Preferably, a second fault-closed valve is provided on the second discharge pipe.

[0016] Preferably, both the evaporation and concentration tank and the cooling and stirring tank are equipped with stirring devices.

[0017] Compared with the prior art, this utility model has the following advantages and beneficial effects: I. This utility model provides an anti-clogging system for a reboiler in a high-concentration waste liquid distillation column. After concentration in the distillation column, the high-concentration waste liquid is discharged into an evaporation and concentration tank via an external discharge pipe. After further concentration in the evaporation and concentration tank, the liquid is discharged into a cooling and stirring tank via a first discharge pipe. Crystallization occurs in the cooling and stirring tank, and the precipitated waste liquid is discharged into a settling tank via a second discharge pipe. After settling in the settling tank, the clarified liquid is discharged into a filter via a clarified liquid pipe. The waste residue in the settling tank and the filter is discharged into a hydrolysis tank for hydrolysis treatment via a first slag discharge pipe and a second slag discharge pipe, respectively. This utility model effectively prevents reboiler clogging.

[0018] II. This utility model provides an anti-clogging system for a reboiler in a high-concentration waste liquid distillation column. It increases the waste liquid discharge rate through an external drain pipe; the uniform heating characteristic of the evaporator prevents localized high temperatures and crystal precipitation during further concentration of the high-concentration distillation column bottom residue in the evaporation and concentration tank. Simultaneously, continuous stirring within the evaporation and concentration tank further ensures uniform heating.

[0019] III. The present invention provides an anti-clogging system for a reboiler of a high-concentration waste liquid distillation tower, and the liquid level control unit is set to facilitate the control of the liquid level in the distillation tower.

[0020] IV. The anti-clogging system for a reboiler in a high-concentration waste liquid distillation tower provided by this utility model, with the setting of a first pressure control unit and a second pressure control unit, facilitates the control of the pressure in the evaporation concentration tank and the cooling stirring tank.

[0021] V. The present invention provides an anti-clogging system for a reboiler in a high-concentration waste liquid distillation tower. The setting of a first fault-closing valve and a second fault-closing valve ensures that the first and second discharge pipes are cut off in time when the system malfunctions, thus avoiding more serious accidents. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model; The components include: 1. Distillation column; 2. Reboiler; 3. Circulation pipe; 4. Outlet pipe; 5. Evaporation and concentration tank; 6. First discharge pipe; 7. First discharge pipe; 8. Cooling and stirring tank; 9. Second discharge pipe; 10. Second discharge pipe; 11. Settling tank; 12. First slag discharge pipe; 13. Clear liquid pipe; 14. Filter; 15. Product liquid outlet pipe; 16. Second slag discharge pipe; 17. Liquid level control unit; 171. First liquid level gauge; 172. Flow regulating valve; 18. First pressure control... 181. First pressure gauge; 182. First venting regulating valve; 19. Second pressure control unit; 191. Second pressure gauge; 192. Second venting regulating valve; 20. First heat exchange jacket; 201. Steam inlet pipe; 202. Condensate outlet pipe; 21. Second heat exchange jacket; 211. Circulating water inlet pipe; 212. Circulating water outlet pipe; 22. Second level gauge; 23. First fault-closed valve; 24. Second fault-closed valve; 25. Stirring device. Detailed Implementation The present invention will be further described in detail below with reference to the embodiments, but the implementation of the present invention is not limited thereto.

[0023] Example 1 like Figure 1 As shown, an anti-clogging system for a reboiler in a high-concentration waste liquid distillation column includes a reboiler 2 and a distillation column 1. The reboiler 2 and the distillation column 1 are connected by a circulation pipe 3. The circulation pipe 3 is connected to an external discharge pipe 4, which is connected to an evaporation and concentration tank 5. The evaporation and concentration tank 5 is equipped with a first discharge pipe 6 and a first discharge pipe 7. The first discharge pipe 6 is connected to a cooling and stirring tank 8. The cooling and stirring tank 8 is equipped with a second discharge pipe 9 and a second discharge pipe 10. The second discharge pipe 9 is connected to a settling tank 11. The settling tank 11 is equipped with a first slag discharge pipe 12 and a clear liquid pipe. The clear liquid pipe is connected to a filter 14. The filter 14 is equipped with a product liquid outlet pipe 15 and a second slag discharge pipe 16. The first slag discharge pipe 12 and the second slag discharge pipe 16 are connected to a hydrolysis tank.

[0024] Example 2 like Figure 1As shown, an anti-clogging system for a reboiler in a high-concentration waste liquid distillation column includes a reboiler 2 and a distillation column 1. The reboiler 2 and the distillation column 1 are connected by a circulation pipe 3. The circulation pipe 3 is connected to an external discharge pipe 4, which is connected to an evaporation and concentration tank 5. The evaporation and concentration tank 5 is equipped with a first discharge pipe 6 and a first discharge pipe 7. The first discharge pipe 6 is connected to a cooling and stirring tank 8. The cooling and stirring tank 8 is equipped with a second discharge pipe 9 and a second discharge pipe 10. The second discharge pipe 9 is connected to a settling tank 11. The settling tank 11 is equipped with a first slag discharge pipe 12 and a clear liquid pipe. The clear liquid pipe is connected to a filter 14. The filter 14 is equipped with a product liquid outlet pipe 15 and a second slag discharge pipe 16. The first slag discharge pipe 12 and the second slag discharge pipe 16 are connected to a hydrolysis tank.

[0025] The distillation column 1 is equipped with a liquid level control unit 17, which includes a first liquid level gauge 171 installed on the distillation column 1 and a flow regulating valve 172 installed on the external discharge pipe 4.

[0026] The evaporation and concentration tank 5 is equipped with a first pressure control unit 18, which includes a first pressure gauge 181 installed on the evaporation and concentration tank 5 and a first venting regulating valve 182 installed on the first discharge pipe 7.

[0027] The cooling mixing tank 8 is equipped with a second pressure control unit 19, which includes a second pressure gauge 191 installed on the cooling mixing tank 8 and a second venting regulating valve 192 installed on the second discharge pipe 10.

[0028] The evaporation and concentration tank 5 is provided with a first heat exchange jacket 20; the first heat exchange jacket 20 is provided with a steam inlet pipe 201 and a condensate outlet pipe 202.

[0029] The cooling and stirring tank 8 is provided with a second heat exchange jacket 21; the second heat exchange jacket 21 is provided with a circulating water inlet pipe 211 and a circulating water outlet pipe 212.

[0030] The settling tank is equipped with a second level gauge 22.

[0031] The first discharge pipe 6 is equipped with a heat tracing jacket and a first fault-closing valve 23. The heat tracing jacket is equipped with a steam inlet pipe 201 and a condensate outlet pipe 202.

[0032] The second discharge pipe 9 is equipped with a second fault-closing valve 24.

[0033] Both the evaporation and concentration tank 5 and the cooling and stirring tank 8 are equipped with stirring devices 25.

[0034] It also includes a DCS controller, which is connected to a first level gauge 171, a flow regulating valve 172, a first pressure gauge 181, a first vent regulating valve 182, a second pressure gauge 191, a second vent regulating valve 192, a second level gauge 22, a first fault-closed valve 23, and a second fault-closed valve 24.

[0035] Among them, the reboiler 2, distillation column 1, evaporation and concentration tank 5, cooling and stirring tank 8, settling tank 11, filter 14, hydrolysis tank, first level gauge 171, flow regulating valve 172, first pressure gauge 181, first vent regulating valve 182, second pressure gauge 191, second vent regulating valve 192, first heat exchange jacket 20, second heat exchange jacket 21, second level gauge 22, heat tracing jacket, first fault-close valve 23, second fault-close valve 24, stirring device 25, and DCS controller are all existing technologies and will not be described in detail here.

[0036] Compared with the prior art, this utility model has the following advantages and beneficial effects: I. This utility model provides an anti-clogging system for a reboiler 2 in a high-concentration waste liquid distillation column 1. After concentration in the distillation column 1, the high-concentration waste liquid is discharged into an evaporation and concentration tank 5 through an external discharge pipe 4. After further concentration in the evaporation and concentration tank 5, it is discharged into a cooling and stirring tank 8 through a first discharge pipe 6. Crystallization occurs in the cooling and stirring tank 8, and the precipitated waste liquid is discharged into a settling tank through a second discharge pipe 9. After settling in a settling tank 11, the clarified liquid is discharged into a filter 14 through a clarified liquid pipe. The waste residue in the settling tank 11 and the filter 14 is discharged into a hydrolysis tank for hydrolysis treatment through a first slag discharge pipe 12 and a second slag discharge pipe 16, respectively. This utility model effectively prevents clogging of the reboiler 2.

[0037] II. This utility model provides an anti-clogging system for the reboiler 2 of a high-concentration waste liquid distillation column 1, which increases the waste liquid discharge through the external discharge pipe 4; the uniform heating characteristic of the evaporator prevents local high temperatures and crystal precipitation during the further concentration of the residue in the high-concentration distillation column 1 within the evaporation and concentration tank 5. Simultaneously, continuous stirring within the evaporation and concentration tank 5 further ensures uniform heating.

[0038] III. The present invention provides an anti-clogging system for a reboiler 2 of a high-concentration waste liquid distillation column 1, and the liquid level control unit 17 is set to facilitate the control of the liquid level in the distillation column 1.

[0039] IV. The anti-clogging system for the reboiler 2 of the high-concentration waste liquid distillation tower 1 provided by this utility model, with the setting of the first pressure control unit 18 and the second pressure control unit 19, facilitates the control of the pressure in the evaporation and concentration tank 5 and the cooling and stirring tank 8.

[0040] V. The anti-clogging system for the reboiler 2 of the high-concentration waste liquid distillation tower 1 provided by this utility model, with the setting of the first fault-closing valve 23 and the second fault-closing valve 24, enables the first discharge pipe 6 and the second discharge pipe 9 to be cut off in time when the system fails, so as to avoid more serious accidents.

[0041] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. An anti-clogging system for a reboiler in a high-concentration waste liquid distillation column, characterized in that: The system includes a reboiler (2) and a distillation column (1), which are connected by a circulation pipe (3). The circulation pipe (3) is connected to an external discharge pipe (4), which is connected to an evaporation and concentration tank (5). The evaporation and concentration tank (5) is equipped with a first discharge pipe (6) and a first discharge pipe (7). The first discharge pipe (6) is connected to a cooling and stirring tank (8). The cooling and stirring tank (8) is equipped with a second discharge pipe (9) and a second discharge pipe (10). The second discharge pipe (9) is connected to a settling tank (11). The settling tank (11) is equipped with a first slag discharge pipe (12) and a clear liquid pipe (13). The clear liquid pipe (13) is connected to a filter (14). The filter (14) is equipped with a product liquid discharge pipe (15) and a second slag discharge pipe (16). The first slag discharge pipe (12) and the second slag discharge pipe (16) are connected to a hydrolysis tank.

2. The anti-clogging system for a reboiler in a high-concentration waste liquid distillation column according to claim 1, characterized in that: The distillation column (1) is equipped with a liquid level control unit (17), which includes a first liquid level gauge (171) installed on the distillation column (1) and a flow regulating valve (172) installed on the external discharge pipe (4).

3. The anti-clogging system for a reboiler in a high-concentration waste liquid distillation column according to claim 1, characterized in that: The evaporation and concentration tank (5) is provided with a first pressure control unit (18), which includes a first pressure gauge (181) provided on the evaporation and concentration tank (5) and a first venting regulating valve (182) provided on the first discharge pipe (7).

4. The anti-clogging system for a reboiler in a high-concentration waste liquid distillation column according to claim 1, characterized in that: The cooling mixing tank (8) is provided with a second pressure control unit (19), which includes a second pressure gauge (191) provided on the cooling mixing tank (8) and a second venting regulating valve (192) provided on the second discharge pipe (10).

5. The anti-clogging system for a reboiler in a high-concentration waste liquid distillation column according to claim 1, characterized in that: The evaporation and concentration tank (5) is provided with a first heat exchange jacket (20); the first heat exchange jacket (20) is provided with a steam inlet pipe (201) and a condensate outlet pipe (202).

6. The anti-clogging system for a reboiler in a high-concentration waste liquid distillation column according to claim 1, characterized in that: The cooling mixing tank (8) is equipped with a second heat exchange jacket (21); the second heat exchange jacket (21) is equipped with a circulating water inlet pipe (211) and a circulating water outlet pipe (212).

7. The anti-clogging system for a reboiler in a high-concentration waste liquid distillation column according to claim 1, characterized in that: A second level gauge (22) is installed on the settling tank (11).

8. The anti-clogging system for a reboiler in a high-concentration waste liquid distillation column according to claim 1, characterized in that: The first discharge pipe (6) is equipped with a heat tracing jacket and a first fault-closing valve (23).

9. The anti-clogging system for a reboiler in a high-concentration waste liquid distillation column according to claim 1, characterized in that: A second fault-closed valve (24) is provided on the second discharge pipe (9).

10. The anti-clogging system for a reboiler in a high-concentration waste liquid distillation column according to claim 1, characterized in that: Both the evaporation and concentration tank (5) and the cooling and stirring tank (8) are equipped with stirring devices (25).

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