CN109847470B - Emptying hydrogen recovery system and method for cold hydrogenated silicon powder charging system - Google Patents
Emptying hydrogen recovery system and method for cold hydrogenated silicon powder charging system Download PDFInfo
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- CN109847470B CN109847470B CN201910108572.4A CN201910108572A CN109847470B CN 109847470 B CN109847470 B CN 109847470B CN 201910108572 A CN201910108572 A CN 201910108572A CN 109847470 B CN109847470 B CN 109847470B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
The invention discloses an emptying hydrogen recovery system and method of a cold hydrogenated silicon powder feeding system, wherein the system comprises a silicon powder filter I and a silicon powder filter II which are sequentially connected with a silicon powder feeding tank by utilizing a pipeline, and a hydrogen compressor is connected to the gas outlet end of the silicon powder filter II; and a branch pipe is arranged between the silica powder filter I and the silica powder filter II and is connected to the waste gas leaching system. The scheme only needs to add one silica powder filter and a corresponding pipeline, and has small investment. The hydrogen consumption is reduced, and the hydrogen can be recovered according to the designed operation amount by about 357000Nm 3/year.
Description
Technical Field
The invention relates to a system and a method for recycling blowdown hydrogen in a cold hydrogenation silicon making process.
Background
In the process of preparing silicon powder by cold hydrogenation, the silicon powder feeding tank is required to accept the silicon powder again after the silicon powder is pushed out, the pressure in the silicon powder feeding tank is required to be decompressed from 2.8Mpa G to micro positive pressure in the process, and the part of gas is hydrogen. In the prior art, the decompressed hydrogen is sent to the waste gas leaching process for treatment and then is discharged to the atmosphere.
The hydrogen is directly discharged to cause great waste, and a large amount of pressure release hydrogen can aggravate the load of the waste gas leaching process, so that the whole system is not smooth to operate.
Disclosure of Invention
In view of the above, the invention provides a system and a method for recycling the discharged hydrogen of a cold hydrogenated silicon powder charging system, which are used for recycling the hydrogen discharged from a silicon powder feeding tank.
In order to solve the technical problems, the technical scheme of the invention is as follows: the emptying hydrogen recovery system of the cold hydrogenated silicon powder charging system comprises a silicon powder filter I and a silicon powder filter II which are sequentially connected with a silicon powder charging tank by utilizing a pipeline, wherein a hydrogen compressor is connected to the gas outlet end of the silicon powder filter II; and a branch pipe is arranged between the silica powder filter I and the silica powder filter II and is connected to the waste gas leaching system.
As an improvement, a valve I is arranged on the branch pipe.
As an improvement, a valve II is arranged between the silicon powder filter II and the branch pipe.
Preferably, the silica powder filter comprises a tank body, wherein a transverse partition plate is arranged in the tank body; a plurality of filter elements are arranged on the partition board; the tank body is provided with an air inlet below the partition board, and an air outlet above the partition board; and the end of the tank body with the air outlet is provided with a back-blowing opening, and the end with the air inlet is provided with a silicon powder outlet.
As an improvement, the tank body is cylindrical, and a conical collecting hopper is arranged at the bottom of the tank body.
Preferably, the filter element is cylindrical, and one end of the filter element is open and the other end of the filter element is closed; one end of the opening of the air inlet is towards one end of the air outlet of the tank body.
Preferably, the filter element is a sintered metal filter element.
As an improvement, a buffer tank is arranged between the hydrogen compressor and the silicon powder filter II.
The invention also provides a method for recycling the discharged hydrogen of the cold hydrogenated silicon powder charging system, which comprises the following steps:
A. closing a branch connected with the waste gas leaching system before the pressure of the silicon powder feeding tank is released;
B. opening a pipeline between the silicon powder filter I and the silicon powder filter II;
C. the pressure-released hydrogen is filtered by a silica powder filter I and a silica powder filter II in sequence;
D. closing a pipeline between the silica powder filter I and the silica powder filter II after the pressure relief is finished;
E. and opening a branch connected with the waste gas leaching system.
As a preferable mode, when pressure relief is not smooth, the back-blowing opening is utilized to introduce hydrogen for back-blowing cleaning of the filter element.
The invention has the advantages that:
1. the scheme only needs to add one silica powder filter and a corresponding pipeline, and has small investment.
2. The hydrogen consumption is reduced, and the hydrogen can be recovered according to the designed operation amount by about 357000Nm 3/year.
3. The hydrogen consumption is reduced, and the treatment load of the waste gas leaching process is also reduced.
4. The pressure release of the cold hydrogenated silicon powder feeding tank is not influenced under the condition of high pressure of the tail gas main pipe, and continuous and stable operation of cold hydrogenation is ensured.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a schematic structural view of a silica fume filter.
The marks in the figure: 1 silica flour feeding tank, 2 silica flour filter I, 3 silica flour filter II, 4 buffer tank, 5 waste gas leaching system, 6 valve I, 7 valve II, 11 tank body, 12 collecting hopper, 13 air inlet, 14 air outlet, 15 baffle, 16 filter core, 17 back-blowing mouth, 18 silica flour discharge port.
Detailed Description
In order to make the technical scheme of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the following specific embodiments.
The invention provides a hydrogen recovery system of a cold hydrogenated silicon powder charging system.
Example 1
The invention comprises a silica powder filter I2 and a silica powder filter II3 which are sequentially connected with a silica powder feeding tank 1 by utilizing a pipeline, wherein the gas outlet end of the silica powder filter II3 is connected with a hydrogen compressor. A buffer tank 4 is arranged between the hydrogen compressor and the silicon powder filter II 3.
The silica powder filter comprises a tank 11, wherein the tank 11 is cylindrical, and a conical collecting hopper 12 is arranged at the bottom of the tank. A transverse partition plate 15 is arranged in the tank 11; a plurality of filter elements 16 are arranged on the partition plate 15; an air inlet 13 is formed in the tank 11 below the partition plate 15, and an air outlet 14 is formed in the tank 1 above the partition plate 15; and the end of the tank 11 with the air outlet is provided with a back-blowing port 17, and the end with the air inlet 13 is provided with a silicon powder discharge port 18. The filter element 16 is cylindrical, and one end of the filter element is open and the other end of the filter element is closed; one end of the opening of the air inlet is towards one end of the air outlet of the tank body.
When the silica powder feeding tank is depressurized, the hydrogen sequentially passes through the silica powder filter I and the silica powder filter II, and silica powder carried in the hydrogen is filtered and then enters the buffer tank 4 for reuse.
Example 2
As shown in fig. 1 and 2, the invention comprises a silica powder filter I2 and a silica powder filter II3 which are sequentially connected with a silica powder feeding tank 1 by utilizing a pipeline, wherein the gas outlet end of the silica powder filter II3 is connected with a hydrogen compressor. A buffer tank 4 is arranged between the hydrogen compressor and the silicon powder filter II 3. A branch pipe is arranged between the silica powder filter I2 and the silica powder filter II3, and the branch pipe is connected to the waste gas leaching system 5. The branch pipe is provided with a valve I6, and a valve II7 is arranged between the silicon powder filter II3 and the branch pipe. The branch is an existing pipeline, and the original pipeline is generally not required to be removed in the actual production process. And when the first line of the valve II7 fails, the circuit can be switched to ensure that the whole system continues to operate, so that shutdown maintenance is avoided.
The silicon powder filter comprises a tank 11, wherein the tank 11 is cylindrical, and a conical collecting hopper 12 is arranged at the bottom of the tank. A transverse partition plate 15 is arranged in the tank 11; a plurality of filter elements 16 are arranged on the partition plate 15; an air inlet 13 is formed in the tank 11 below the partition plate 15, and an air outlet 14 is formed in the tank 1 above the partition plate 15; and the end of the tank 11 with the air outlet is provided with a back-blowing port 17, and the end with the air inlet 13 is provided with a silicon powder discharge port 18. The filter element 16 is cylindrical, and one end of the filter element is open and the other end of the filter element is closed; one end of the opening of the air inlet is towards one end of the air outlet of the tank body.
Wherein, the valve I6 is normally opened and the valve II7 is normally closed, so that the scattered hydrogen leaked from the silicon powder feeding tank 1 can enter the waste gas leaching system 5 for treatment and then be emptied.
The valve I6 and the valve I7 are used for cutting off pipelines, so that the hydrogen passing path can be conveniently switched. The two valves are preferably solenoid valves and are remotely controlled by a master control. Of course, a general shutoff valve may be selected, and an operator is required to manually open and close the valve.
In order to conveniently collect the filtered silica powder, a collecting hopper 12 is arranged at the bottom of the silica powder filter tank 11. The collecting hopper 12 is conical with a large upper part and a small lower part, and a valve is arranged at the bottom of the collecting hopper. The collection hopper 12 can relatively concentrate the silicon powder, and is convenient for one-time emptying.
The filter element 16 is a sintered metal filter element, which is sintered with a wire mesh as a skeleton, and then sprayed with metal powder at high temperature as a filter coating. For better filtration of the silica fume, the filter element mesh diameter should be between 1-20 microns. And the filter element 16 should be in a cylindrical shape with one end open and one end closed, and the filter element 16 should be disposed on the air inlet 13 side of the tank 11, but open toward the air outlet 14 side of the tank 11. The purpose is firstly to enlarge the filtering area and improve the filtering efficiency. Secondly, when the hydrogen is utilized for back blowing, the silicon powder deposited on the filter element 16 is more easily blown off.
The purpose of the buffer tank 4 is to provide a faster flow rate due to the greater hydrogen pressure during pressure relief. If the hydrogen compressor to the back end is directly turned on, it would be beyond the throughput of the hydrogen compressor. The recovered hydrogen is temporarily stored by the buffer tank 4 to relieve the pressure at the rear end.
Meanwhile, the invention provides a method for recycling the discharged hydrogen of the cold hydrogenated silicon powder charging system, which comprises the following steps.
A. And closing a branch connected with the waste gas leaching system before the pressure of the silicon powder feeding tank 1 is released.
When the silica powder feeding tank 1 is used for feeding equipment, the silica powder feeding tank is communicated with an exhaust leaching system on a branch and disconnected with the silica powder filter II 3. A small amount of scattered gas in the running process of the equipment can be discharged after being filtered once and then enters the waste gas leaching system for treatment. A small amount of hydrogen does not need to be recovered, and the increase of system load is avoided. When the main control pushes out the silicon powder in the silicon powder feeding tank 1 to be fed again, the silicon powder feeding tank 1 needs to be depressurized. In this case, the branch connecting the waste gas washing system needs to be disconnected.
B. And opening a pipeline between the silicon powder filter I3 and the silicon powder filter II 4.
Through master control or manual closing valve I6, open valve II7 for silica flour feed tank 1 and silica flour filter II3 intercommunication.
C. The pressure release hydrogen is filtered through a silica powder filter I2 and a silica powder filter II3 in sequence.
Of course, the silica fume filter may be provided in two or more in series, which requires consideration from the balance between cost and efficiency. In this application, the hydrogen is filtered at least twice before entering the hydrogen compressor. Because even a trace amount of silicon powder enters the hydrogen compressor, unpredictable results are caused as follows!
D. And closing a pipeline between the silica powder filter I2 and the silica powder filter II3 after the pressure relief is finished.
After the pressure relief is finished, the valve II is closed through a main control or a manual work, and a pipeline of the space 3 between the silicon powder filter I2 and the silicon powder filter II is cut off. The silicon powder feeding tank 1 starts normal feeding operation.
E. And opening a branch connected with the waste gas leaching system.
The valve I is opened by a main control or a manual operation, so that trace hydrogen generated in the operation process of the silicon powder feeding tank 1 can smoothly enter a waste gas leaching system on a branch for treatment and then is emptied.
The silica fume filtered by the filter element 16 enters the collection hopper 12, is discharged from the silica fume discharge port 18, and is collected for secondary use.
When pressure relief is not smooth, hydrogen can be introduced through the back-blowing port 17 to back-blow the filter element 16 for cleaning silicon powder deposited on the filter element 16, so that the filtering efficiency is improved. In actual production, whether the pressure relief is smooth or not is judged according to the pressure difference at two ends of the silicon powder filter partition plate. If the pressure difference is too large, the filter element is seriously blocked, and then back flushing cleaning is needed. The hydrogen source sprays hydrogen into the tank body through the back-blowing opening, and enters the filter element from the opening end of the filter element to blow off the silicon powder attached to the filter element.
After the hydrogen recovery is carried out by adopting the invention, the whole system can recover the hydrogen at the running amount of 357000Nm 3/year according to the design. The hydrogen consumption is reduced, and the treatment load of the waste gas leaching process is also reduced.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that the above-mentioned preferred embodiment should not be construed as limiting the invention, and the scope of the invention should be defined by the appended claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (9)
1. The method for recycling the discharged hydrogen of the cold hydrogenated silicon powder charging system is applied to the discharged hydrogen recycling system of the cold hydrogenated silicon powder charging system, the discharged hydrogen recycling system of the cold hydrogenated silicon powder charging system comprises a silicon powder filter I and a silicon powder filter II which are sequentially connected with a silicon powder charging tank by utilizing pipelines, and the gas outlet end of the silicon powder filter II is connected with a hydrogen compressor; a branch pipe is arranged between the silica powder filter I and the silica powder filter II and is connected to an exhaust gas leaching system; the method is characterized by comprising the following steps of:
A. closing a branch connected with the waste gas leaching system before the pressure of the silicon powder feeding tank is released;
B. opening a pipeline between the silicon powder filter I and the silicon powder filter II;
C. the pressure-released hydrogen is filtered by a silica powder filter I and a silica powder filter II in sequence;
D. closing a pipeline between the silica powder filter I and the silica powder filter II after the pressure relief is finished;
E. and opening a branch connected with the waste gas leaching system.
2. A method for recycling the emptying hydrogen of a cold hydrogenated silicon powder charging system as set forth in claim 1, wherein: and a valve I is arranged on the branch pipe.
3. A method for recycling the emptying hydrogen of a cold hydrogenated silicon powder charging system as set forth in claim 1, wherein: and a valve II is arranged between the silicon powder filter II and the branch pipe.
4. A method for recycling the emptying hydrogen of a cold hydrogenated silicon powder charging system as set forth in claim 1, wherein: the silica powder filter comprises a tank body, wherein a transverse partition plate is arranged in the tank body; a plurality of filter elements are arranged on the partition board; the tank body is provided with an air inlet below the partition board, and an air outlet above the partition board; and the end of the tank body with the air outlet is provided with a back-blowing opening, and the end with the air inlet is provided with a silicon powder outlet.
5. A method for recycling hydrogen from a cold hydrogenated silicon powder charging system as defined in claim 4, wherein: the tank body is cylindrical, and a conical collecting hopper is arranged at the bottom of the tank body.
6. A method for recycling hydrogen from a cold hydrogenated silicon powder charging system as defined in claim 4, wherein: the filter element is cylindrical, and one end of the filter element is open and the other end of the filter element is closed; one end of the opening of the air inlet is towards one end of the air outlet of the tank body.
7. A method for recycling hydrogen from a cold hydrogenated silicon powder charging system as defined in claim 6, wherein: the filter element is a sintered metal filter element.
8. A method for recycling the emptying hydrogen of a cold hydrogenated silicon powder charging system as set forth in claim 1, wherein: a buffer tank is arranged between the hydrogen compressor and the silicon powder filter II.
9. A method for recycling hydrogen discharged from a cold hydrogenated silicon powder charging system as set forth in claim 1, comprising the steps of: when pressure relief is not smooth, the filter element is back-blown and cleaned by utilizing the back-blowing port to introduce hydrogen.
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| CN201910108572.4A CN109847470B (en) | 2019-01-31 | 2019-01-31 | Emptying hydrogen recovery system and method for cold hydrogenated silicon powder charging system |
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| CN109847470B true CN109847470B (en) | 2023-08-01 |
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| CN110787543A (en) * | 2019-10-25 | 2020-02-14 | 上海黔宝环保新材料有限公司 | Production method of active powder composite new material |
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