CN210291842U - Steam cyclic utilization system in polycrystalline silicon production - Google Patents
Steam cyclic utilization system in polycrystalline silicon production Download PDFInfo
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- CN210291842U CN210291842U CN201920962109.1U CN201920962109U CN210291842U CN 210291842 U CN210291842 U CN 210291842U CN 201920962109 U CN201920962109 U CN 201920962109U CN 210291842 U CN210291842 U CN 210291842U
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Abstract
The utility model relates to the technical field of polysilicon production, in particular to a steam recycling system in polysilicon production, which comprises an overheated saturated steam source; the temperature and pressure reducing device is connected with the superheated saturated steam source and is used for reducing the temperature and the pressure of the superheated saturated steam to obtain medium-pressure saturated steam and/or low-pressure saturated steam; the saturated steam utilization device is connected with the temperature and pressure reduction device and is used for receiving medium-pressure saturated steam and/or low-pressure saturated steam to generate steam condensate; the flash tank is connected with the saturated steam utilization device and used for receiving the medium-pressure condensate and outputting low-pressure steam and low-pressure condensate after flash evaporation; the steam condensate storage tank is respectively connected with the flash tank and the low-pressure saturated steam utilization device and is used for receiving low-pressure condensate; the high-temperature water pump is connected with the steam condensate storage tank and is used for conveying the condensate in the steam condensate storage tank to the temperature and pressure reduction device to obtain medium-pressure saturated steam and/or low-pressure saturated steam.
Description
Technical Field
The utility model relates to a polycrystalline silicon production technical field especially relates to a steam cyclic utilization system in polycrystalline silicon production.
Background
In the production process of polysilicon, a cold hydrogenation and rectification plant has a plurality of reaction devices and heat exchangers, such as: the reboiler, silicon tetrachloride preheater, hydrogen heater and rectifying column etc. need to heat up and lower the temperature in the production technology, need consume a large amount of middling pressure steam and low pressure steam simultaneously. In the process of heating by medium-pressure or low-pressure steam, a large amount of medium-pressure or low-pressure condensate is generated when the steam is cooled, after partial steam is flashed out from the medium-pressure condensate through the flash tank, the residual large amount of condensate with the temperature of about 100-150 ℃ can not be directly utilized generally, and further reasonable treatment is needed. The current treatment methods mainly comprise: 1. directly discharging the condensate according to the amount of the condensate or naturally cooling the condensate in the discharging process to be used as greening water; 2. the condensate is directly discharged into a circulating water pool to be used as circulating water or is discharged into the circulating water pool to be used as circulating water after being cooled and cooled by a cooling tower.
Because the condensate contains a large amount of waste heat, the direct discharge can cause heat waste and water resource waste; moreover, the condensate liquid contains very low calcium and magnesium plasma, and meets the process index requirements of the desuperheating water. At present, the steam temperature and pressure reducer of each enterprise uses 35 ℃ desalted water for cooling, and the cost is higher.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a steam cyclic utilization system in polycrystalline silicon production of utility model, the main aim at realizes the cyclic utilization of steam, can reduce overheated saturated steam's use amount, has practiced thrift manufacturing cost.
In order to achieve the above object, the utility model mainly provides the following technical scheme:
the embodiment of the utility model provides a steam recycling system in polysilicon production, which comprises an overheated saturated steam source, a temperature and pressure reducing device, a saturated steam utilization device, a steam condensate storage tank, a flash tank and a high-temperature water pump;
the temperature and pressure reducer includes: medium-pressure and low-pressure temperature and pressure reducers;
the medium-pressure temperature and pressure reducing device is respectively connected with the superheated saturated steam source and the steam condensate storage tank, and is used for receiving superheated saturated steam and reducing temperature and pressure to obtain medium-pressure saturated steam;
the low-pressure temperature and pressure reducer is respectively connected with the medium-pressure temperature and pressure reducer and the steam condensate storage tank and is used for receiving medium-pressure saturated steam and reducing temperature and pressure to obtain low-pressure saturated steam;
the saturated steam utilizing apparatus includes: a medium-pressure saturated steam utilization device and a low-pressure saturated steam utilization device;
the medium-pressure saturated steam utilization device is connected with the medium-pressure temperature and pressure reduction device and is used for receiving and utilizing medium-pressure saturated steam to generate medium-pressure steam condensate;
the low-pressure saturated steam utilization device is connected with the low-pressure temperature and pressure reducing device and is used for receiving and utilizing low-pressure saturated steam to generate low-pressure steam condensate;
the flash tank is connected with the medium-pressure saturated steam utilization device and is used for receiving medium-pressure steam condensate output by the medium-pressure saturated steam utilization device and outputting low-pressure steam and condensate after flash evaporation;
the steam condensate storage tank is connected with the flash tank and is used for receiving condensate output from the flash tank;
the steam condensate storage tank is connected with the low-pressure saturated steam utilization device and is used for receiving low-pressure steam condensate output by the low-pressure saturated steam utilization device;
the high-temperature water pump is connected with the steam condensate storage tank and used for conveying the condensate in the steam condensate storage tank to the temperature and pressure reducing device so as to be mixed with the superheated saturated steam in the temperature and pressure reducing device for temperature reduction, and medium-pressure saturated steam and/or low-pressure saturated steam are obtained.
Further, a pressure reduction adjusting device is arranged between the medium-pressure saturated steam utilizing device and the flash tank and is used for adjusting the pressure and the flow of the condensate entering the flash tank.
Further, a steam outlet is formed in the upper end of the flash tank; for low pressure steam output within the flash tank;
and a water replenishing port is arranged on the steam condensate storage tank and is used for replenishing desalted water.
Further, a water outlet is formed in the bottom of the steam condensate storage tank; the water outlet is provided with an adjusting valve for controlling the on-off of the water outlet; the regulating valve is controlled by the liquid level of the steam condensate storage tank, so that when the liquid level of the steam condensate storage tank is higher than a set range, the regulating valve is opened, and when the liquid level of the steam condensate storage tank is lower than the set range, the regulating valve is closed.
Further, a water replenishing pipe is arranged on the water replenishing port.
Further, the medium-pressure saturated steam utilization device is one or more of a cold hydrogenation reboiler, a silicon tetrachloride preheater and a hydrogen heater.
Further, the low-pressure saturated steam utilization device is connected with the steam outlet of the flash tank and used for receiving low-pressure steam and utilizing the low-pressure steam to generate low-pressure steam condensate.
Further, the low-pressure saturated steam utilization device is at least one of a rectifying tower or a chlor-alkali heat exchanger.
Further, a water outlet is arranged at the bottom of the flash tank.
Furthermore, a PH on-line monitoring device is arranged at the bottom of the steam condensate storage tank and used for monitoring the PH value of the condensate in the steam condensate storage tank.
By means of the technical scheme, the steam recycling system in the production of the polycrystalline silicon has the following advantages at least:
the cyclic utilization of the steam is realized, the use amount of the superheated saturated steam can be reduced, and the production cost is saved.
The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.
Drawings
Fig. 1 is a schematic view of a steam recycling system in polysilicon production according to an embodiment of the present invention.
Shown in the figure:
1 is an overheated saturated steam source, 2 is a medium-pressure temperature and pressure reducing device, 3 is a low-pressure temperature and pressure reducing device, 4 is a medium-pressure saturated steam utilization device, 5 is a high-temperature water pump, 6 is a pressure reducing adjusting device, 7 is a flash tank, 7-1 is a steam outlet, and 7-2 is a water outlet; 8 is a steam condensate storage tank, 8-1 is a PH on-line monitoring device, 8-2 is a water replenishing port, 8-3 is a water discharging port, and 9 is a low-pressure saturated steam utilization device.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the intended purpose of the present invention, the following detailed description is given with reference to the accompanying drawings and preferred embodiments, in order to explain the detailed embodiments, structures, features and effects of the present invention. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
As shown in FIG. 1, the embodiment of the utility model provides a steam recycling system in polysilicon production, which comprises an overheated saturated steam source 1, a temperature and pressure reducing device, a saturated steam utilization device, a steam condensate storage tank 8, a flash tank 7 and a high-temperature water pump 5; the superheated saturated steam source 1 may be a steam boiler of a thermal power plant to provide superheated saturated steam.
The temperature and pressure reducer includes: a medium pressure temperature and pressure reducer 2 and a low pressure temperature and pressure reducer 3; the medium-pressure temperature and pressure reducing device 2 is respectively connected with the superheated saturated steam source 1 and the steam condensate storage tank 8, and is used for receiving the superheated saturated steam, reducing the temperature and the pressure, and spraying the condensate into the superheated saturated steam to obtain medium-pressure saturated steam; the low-pressure temperature and pressure reducer 3 is respectively connected with the medium-pressure temperature and pressure reducer 2 and the steam condensate storage tank 8 and is used for receiving medium-pressure saturated steam and reducing temperature and pressure to obtain low-pressure saturated steam;
the saturated steam utilization device comprises: a medium-pressure saturated steam utilization device 4 and a low-pressure saturated steam utilization device 9; the medium-pressure saturated steam utilization device 4 is connected with the medium-pressure temperature and pressure reduction device 2 and is used for receiving and utilizing medium-pressure saturated steam, and the saturated steam generates medium-pressure steam condensate in the saturated medium-pressure steam utilization device;
the low-pressure saturated steam utilization device 9 is connected with the low-pressure temperature and pressure reducing device 3 and is used for receiving and utilizing the low-pressure saturated steam, and the saturated steam generates low-pressure steam condensate in the saturated low-pressure saturated steam utilization device 9;
the flash tank 7 is connected with the medium-pressure saturated steam utilization device 4 and is used for receiving medium-pressure steam condensate output by the medium-pressure saturated steam utilization device 4 and outputting low-pressure steam and condensate after flash evaporation;
the steam condensate storage tank 8 is connected with the flash tank 7 and is used for receiving condensate output from the flash tank 7; the steam condensate storage tank 8 is connected with the low-pressure saturated steam utilization device 9 and is used for receiving the low-pressure steam condensate output by the low-pressure saturated steam utilization device 9;
the high-temperature water pump 5 is connected with the steam condensate storage tank 8 and is used for conveying condensate in the steam condensate storage tank 8 to the temperature and pressure reducing device so as to be mixed with superheated saturated steam in the temperature and pressure reducing device for temperature reduction, and medium-pressure saturated steam and/or low-pressure saturated steam are obtained. The cyclic utilization of the steam is realized, the use amount of the superheated saturated steam can be reduced, and the production cost is saved.
Preferably, as in the above embodiment, a pressure reduction adjusting device 6 is arranged between the medium-pressure saturated steam utilization device 4 and the flash tank 7 for adjusting the pressure and flow of the condensate entering the flash tank 7, so that the medium-pressure condensate is applied to the flash tank 7. The pressure-reducing regulator 6 may be a flow rate regulating valve.
As a preference of the above embodiment, the upper end of the flash tank 7 is provided with a steam outlet 7-1; for low pressure steam output within the flash tank 7; preferably, a low pressure saturated steam utilization device 9 is connected to the steam outlet 7-1 of the flash tank 7 for receiving low pressure steam and utilizing it to produce low pressure steam condensate.
As the optimization of the above embodiment, the bottom of the flash tank 7 is provided with a water outlet 7-2, and when the condensate is unusable due to abnormal pH value, the condensate is discharged into a production wastewater treatment trench.
A water replenishing port 8-2 is arranged on the steam condensate storage tank 8 and is used for replenishing desalted water. The normal operation of the temperature and pressure reduction station can be ensured under the abnormal state of the liquid level of the condensate, and the normal operation can be supplemented in time when water is deficient or cut off. As the optimization of the above embodiment, the water replenishing pipe is arranged on the water replenishing port 8-2 and is used for replenishing desalted water; the bottom of the steam condensate storage tank 8 is provided with a PH on-line monitoring device 8-1 for monitoring the PH value of the condensate, so that the phenomenon that the condensate is polluted by the material entering the condensate due to the perforation of the reaction tower or the heat exchanger in production is prevented, the problem can be found in time, and the accident can be prevented. The bottom of the steam condensate storage tank 8 is provided with a heat dissipation mechanism, and the PH on-line monitoring device 8-1 can be arranged on the heat dissipation mechanism.
Preferably, the bottom of the steam condensate storage tank 8 is provided with a water outlet 8-3; the water outlet 8-3 is provided with an adjusting valve for controlling the on-off of the water outlet 8-3; the governing valve passes through steam condensate basin 8's liquid level control to when the liquid level of steam condensate basin 8 is higher than the settlement scope, open the governing valve, when being less than the settlement scope, close the governing valve, in order to guarantee that the liquid level of flash tank 7 is steady.
As a preference of the above embodiment, the medium-pressure saturated steam utilization device 4 is one or more of a cold hydrogenation reboiler, a silicon tetrachloride preheater and a hydrogen heater; the low-pressure saturated steam utilization device 9 is at least one of a rectifying tower or a chlor-alkali heat exchanger, and is equipment using steam in the production of polycrystalline silicon.
As a preference of the above embodiment, there are two high-temperature water pumps 5; two high-temperature water pumps 5 are arranged in parallel to be standby in case of failure.
Preferably, a liquid level control valve is arranged between the flash tank 7 and the steam condensate storage tank 8, and is used for controlling the liquid level of the steam condensate storage tank 7 of the flash tank to ensure the flash effect of the flash tank.
The embodiment of the utility model provides a steam cyclic utilization system in polycrystalline silicon production, the operation flow is as follows:
reducing the temperature and the pressure of the superheated saturated steam to obtain medium-pressure saturated steam and low-pressure saturated steam;
utilizing the medium-pressure saturated steam and the low-pressure saturated steam after temperature and pressure reduction to generate medium-pressure steam condensate and low-pressure condensate;
carrying out flash evaporation treatment on the medium-pressure steam condensate to generate low-pressure steam and low-pressure condensate;
mixing the low-pressure condensate with the superheated saturated steam, reducing the temperature and the pressure, and then obtaining medium-pressure saturated steam and low-pressure saturated steam.
Preferably, the temperature of the steam condensate is 100 to 150 ℃.
The condensate generated by the medium-pressure saturated steam and the low-pressure saturated steam in the utility model meets the process requirements of the desuperheating water; temperature reduction and pressure reduction adjusting device 6 is at the temperature reduction in-process, with the condensate spraying in supersaturated steam, the condensate is because of the heat absorption and all become steam by vaporization, the utility model discloses used the higher temperature's after the flash distillation condensate, the temperature of middling pressure condensate is 100 ~ 150 ℃, and is higher than the desalinized water temperature in the traditional technology, and traditional desalinized water temperature generally is 35 ℃. The utility model discloses after using the condensate, when using with volume supersaturated steam, can produce more middling pressure saturated steam and low pressure saturated steam, practiced thrift manufacturing cost, moreover, the stability of the higher condensate desuperheating of temperature is better, makes the temperature stable.
Further still, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, with such terms being used only to distinguish one element from another. Without departing from the scope of the exemplary embodiments. Similarly, the terms first, second, etc. do not denote any order or order, but rather the terms first, second, etc. are used to distinguish one element from another. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made by the technical spirit of the present invention to the above embodiments are all within the scope of the technical solution of the present invention.
Claims (10)
1. A steam recycling system in polysilicon production is characterized by comprising an overheated saturated steam source, a temperature and pressure reduction device, a saturated steam utilization device, a steam condensate storage tank, a flash tank and a high-temperature water pump;
the temperature and pressure reducer includes: medium-pressure and low-pressure temperature and pressure reducers;
the medium-pressure temperature and pressure reducing device is respectively connected with the superheated saturated steam source and the steam condensate storage tank, and is used for receiving superheated saturated steam and reducing temperature and pressure to obtain medium-pressure saturated steam;
the low-pressure temperature and pressure reducer is respectively connected with the medium-pressure temperature and pressure reducer and the steam condensate storage tank and is used for receiving medium-pressure saturated steam and reducing temperature and pressure to obtain low-pressure saturated steam;
the saturated steam utilizing apparatus includes: a medium-pressure saturated steam utilization device and a low-pressure saturated steam utilization device;
the medium-pressure saturated steam utilization device is connected with the medium-pressure temperature and pressure reduction device and is used for receiving and utilizing medium-pressure saturated steam to generate medium-pressure steam condensate;
the low-pressure saturated steam utilization device is connected with the low-pressure temperature and pressure reducing device and is used for receiving and utilizing low-pressure saturated steam to generate low-pressure steam condensate;
the flash tank is connected with the medium-pressure saturated steam utilization device and is used for receiving medium-pressure steam condensate output by the medium-pressure saturated steam utilization device and outputting low-pressure steam and condensate after flash evaporation;
the steam condensate storage tank is connected with the flash tank and is used for receiving condensate output from the flash tank;
the steam condensate storage tank is connected with the low-pressure saturated steam utilization device and is used for receiving low-pressure steam condensate output by the low-pressure saturated steam utilization device;
the high-temperature water pump is connected with the steam condensate storage tank and used for conveying the condensate in the steam condensate storage tank to the temperature and pressure reducing device so as to be mixed with the superheated saturated steam in the temperature and pressure reducing device for temperature reduction, and medium-pressure saturated steam and/or low-pressure saturated steam are obtained.
2. The steam recycling system in the production of polycrystalline silicon according to claim 1,
and a pressure reduction adjusting device is arranged between the medium-pressure saturated steam utilizing device and the flash tank and is used for adjusting the pressure and the flow of the condensate entering the flash tank.
3. The steam recycling system in the production of polycrystalline silicon according to claim 2,
the upper end of the flash tank is provided with a steam outlet; for low pressure steam output within the flash tank;
and a water replenishing port is arranged on the steam condensate storage tank and is used for replenishing desalted water.
4. The steam recycling system in the production of polycrystalline silicon according to claim 3,
a water outlet is formed in the bottom of the steam condensate storage tank; the water outlet is provided with an adjusting valve for controlling the on-off of the water outlet; the regulating valve is controlled by the liquid level of the steam condensate storage tank, so that when the liquid level of the steam condensate storage tank is higher than a set range, the regulating valve is opened, and when the liquid level of the steam condensate storage tank is lower than the set range, the regulating valve is closed.
5. The steam recycling system in the production of polycrystalline silicon according to claim 4,
and a water replenishing pipe is arranged on the water replenishing port.
6. The steam recycling system in the production of polycrystalline silicon according to claim 5,
the medium-pressure saturated steam utilization device is one or more of a cold hydrogenation reboiler, a silicon tetrachloride preheater and a hydrogen heater.
7. The steam recycling system in the production of polycrystalline silicon according to claim 6,
the low-pressure saturated steam utilization device is connected with the steam outlet of the flash tank and used for receiving low-pressure steam and utilizing the low-pressure saturated steam to generate low-pressure steam condensate.
8. The steam recycling system in the production of polycrystalline silicon according to claim 7,
the low-pressure saturated steam utilization device is at least one of a rectifying tower or a chlor-alkali heat exchanger.
9. The steam recycling system in the production of polycrystalline silicon according to claim 8,
and a water outlet is arranged at the bottom of the flash tank.
10. The steam recycling system in the production of polycrystalline silicon according to claim 9,
and a PH on-line monitoring device is arranged at the bottom of the steam condensate storage tank and is used for monitoring the PH value of the condensate in the steam condensate storage tank.
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| CN201920962109.1U CN210291842U (en) | 2019-06-24 | 2019-06-24 | Steam cyclic utilization system in polycrystalline silicon production |
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| CN201920962109.1U CN210291842U (en) | 2019-06-24 | 2019-06-24 | Steam cyclic utilization system in polycrystalline silicon production |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207101A (en) * | 2019-06-24 | 2019-09-06 | 新疆大全新能源股份有限公司 | Steam recycling system and method in a kind of production of polysilicon |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207101A (en) * | 2019-06-24 | 2019-09-06 | 新疆大全新能源股份有限公司 | Steam recycling system and method in a kind of production of polysilicon |
| CN110207101B (en) * | 2019-06-24 | 2024-02-20 | 新疆大全新能源股份有限公司 | Steam recycling system and method in polysilicon production |
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