CN204346215U - Reduction tail gas heat quantity recovery system - Google Patents
Reduction tail gas heat quantity recovery system Download PDFInfo
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- CN204346215U CN204346215U CN201420722101.5U CN201420722101U CN204346215U CN 204346215 U CN204346215 U CN 204346215U CN 201420722101 U CN201420722101 U CN 201420722101U CN 204346215 U CN204346215 U CN 204346215U
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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
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Abstract
A kind of reduction tail gas heat quantity recovery system, it is characterized in that comprising the jacket heat-exchanger one section (1) be connected with reduction furnace offgas outlet, the jacket heat-exchanger two sections (2) be connected with jacket heat-exchanger one section, the jacket heat-exchanger two-step cooling water inlet (3) be connected with jacket heat-exchanger two sections of (2) outer tubes, the jacket heat-exchanger one-step cooling water out (4) be connected with the outer tube of jacket heat-exchanger one section (1), the jacket heat-exchanger be connected with the reduction furnace offgas outlet mouth of pipe one section of inlet exhaust gas (5).The structure of the snakelike double pipe heat exchanger of reduction tail gas heat quantity recovery system of the present utility model itself can solve the problem of high-temperature hot stress, avoids fixed tube sheet expansion joint and is easily out of order and the leakage at U-tube formula tube sheet place.
Description
Technical field
This utility model belongs to chemical plant installations field, is specifically related to a kind of reduction tail gas heat quantity recovery system, is mainly used in the reduction tail gas heat energy recovery that polysilicon prepares unit.
Background technology
Along with the high speed development of global economy, oil, the dependence of the mankind to the fossil energy such as coal, natural gas are strengthened day by day, and absolute reserves can not meet the needs of long-run development, and fossil energy exhausts at last, and Looking For Substitutions Of Oil is imperative.Thus, the energy demand prediction that to take solar photovoltaic industry as the clean energy resource of representative will the be mankind are inevitable.Polysilicon is the most basic functional material of solar photovoltaic industry.The production of current polysilicon is still occupied an leading position with improved Siemens.Improved Siemens is that closed cycle is produced, TCS and H2 of gaseous state reacts under hot environment in reduction furnace, generate polycrystalline silicon rod and reduction tail gas, in reduction tail gas, the tail gas such as tetrachloro hydrogen silicon, trichlorosilane, hydrogen chloride, hydrogen reclaims to return in raw material through refrigerated separation again and recycles.
Reduction furnace is key equipment in production of polysilicon, because its outlet exhaust temperature of technological requirement is up to 600-700 DEG C, the heat how in simple this partial tail gas of effective recycling the technological requirement meeting follow-up tail gas recycle process tail gas being cooled to 120 ~ 200 DEG C are significant to the energy consumption reducing whole production of polysilicon.
At present, the cooling of reduction furnace outlet tail gas adopts shell-and-tube heat exchanger mostly, and heat exchanger tube adopts common iron substantially, and also have the resistant to elevated temperatures special material of minority, tail gas is walked pipe side water and walked shell-side.Greatly can improve cost of investment with special material, then there is contingent high temperature hidden trouble of equipment with common iron.
Problems existing is:
1) fixed tube-sheet exchanger must consider the impact of thermal expansion from structure, and need arrange expansion joint, easily break down in expansion joint place; U-tube formula is washed away lower place in panel weld at high-temperature gas and is easily leaked;
2) at present shell-and-tube heat exchanger generally all adopts common stainless steel for reducing equipment cost because of structural requirement, common stainless steel will ensure normally to run under 600 ~ 700 DEG C of high temperature, cooling water must be relied on to be controlled by tube wall temperature to spend 300 more, once cut off the water supply, heat exchanger tube wall temperature raises at once and causes heat exchanger to damage, large water gaging and process stream generation chemical reaction, produce serious accident;
3) contain a large amount of heats close in the process tail gas of 600 ~ 700 DEG C, this portion of energy of effective and reasonable recycling effectively can reduce production cost;
4) the factory building pipeline that reduces is more, and complicated layout, needs larger layout and space for maintenance according to ordinary heat exchanger.Increase construction cost.This pattern heat exchanger can according to field position independent assortment.
Summary of the invention
The purpose of this utility model is to provide a kind of reduction tail gas heat quantity recovery system, its capital equipment comprises the double pipe heat exchanger be directly connected with reduction furnace offgas outlet, the hot water flash evaporation tank, hot water supplying pump and the matching instrument that are connected with double pipe heat exchanger jacket water (J.W.).
The technology that reduction tail gas heat quantity recovery system of the present utility model solves simplifies tail gas heat exchanger heat transmission equipment structure, reduces special material use amount, ensures heat exchanger safe and reliable operation and fully can recycle the heat in tail gas.
The technical solution of the utility model is:
A kind of reduction tail gas heat quantity recovery system, comprise the jacket heat-exchanger that is connected with reduction furnace offgas outlet one section 1, the jacket heat-exchanger be connected with jacket heat-exchanger one section two section 2, the jacket heat-exchanger two-step cooling water inlet 3 be connected with jacket heat-exchanger two section of 2 outer tube, the jacket heat-exchanger one-step cooling water out 4 be connected with the outer tube of jacket heat-exchanger one section 1, the jacket heat-exchanger be connected with the reduction furnace offgas outlet mouth of pipe one section of inlet exhaust gas 5, jacket heat-exchanger two sections of offgas outlet 6, reduction furnace chuck cooling water inlet pipe 7, reduction furnace chuck CWR 8, jacket heat-exchanger one section of offgas outlet 9 that jacket heat-exchanger two section of 2 outer tube import is connected, the jacket heat-exchanger two sections of inlet exhaust gas 10 be connected are exported with jacket heat-exchanger one section of 1 outer tube, jacket heat-exchanger two-step cooling water out 11 and jacket heat-exchanger one-step cooling water inlet 12.
Described jacket heat-exchanger one section of inlet exhaust gas 5 is by the inlet exhaust gas 10 of two sections of jacket heat-exchanger one section of offgas outlet 9 joint sleeve heat exchanger.
Reduction furnace high-temperature tail gas out walks the import 5 of a section of interior pipe through double-tube heat exchanger, enters the inlet exhaust gas 10 of two sections of double-tube heat exchanger with jacket water (J.W.) heat exchange after being cooled to about 350 degree of temperature from jacket heat-exchanger one section of offgas outlet 9.Be cooled to about 200 degree to send from offgas outlet 6, enter reduction tail gas recycle operation.
Described reduction furnace chuck cooling water inlet pipe 7 is communicated with jacket heat-exchanger cooling water inlet 3, and jacket heat-exchanger two-step cooling water out 11 is communicated with jacket heat-exchanger one-step cooling water inlet 12.
The cooling water of double pipe heat exchanger causes jacket heat-exchanger cooling water inlet 3 temperature from reduction furnace chuck cooling water inlet pipe 7 and is ~ 140 DEG C, jacket heat-exchanger one-step cooling water inlet 12 is out delivered to from jacket heat-exchanger two-step cooling water out 11, rise to tail gas heat-exchange temperature in sleeve pipe ~ 160 DEG C.
Described jacket heat-exchanger one-step cooling water out 4 is communicated with flash tank 13 respectively with reduction furnace chuck CWR 8.
Cooling water backwater out goes flash tank 13 flash distillation to produce the low-pressure steam of 3Bar (g) from jacket heat-exchanger one-step cooling water out 4 together with reduction furnace chuck CWR 8, steam is incorporated to full factory low-pressure steam pipe network, and condensed water returns cooling water water-feeding system through hot water supplying pump 14.
A kind of reduction tail gas heat quantity recovery system.Capital equipment comprises the double pipe heat exchanger be directly connected with reduction furnace offgas outlet, the hot water flash evaporation tank, hot water supplying pump and the matching instrument that are connected with double pipe heat exchanger jacket water (J.W.).
Double pipe heat exchanger forms primarily of two parts: the high temperature section that Part I is directly connected with reduction furnace offgas outlet.Comprising material is the inlet exhaust gas flange that the interior pipe of INCOLOY800 is 20 carbon steel outer tubes with material and is connected with described inner and outer pipes, the offgas outlet flange be connected with Part II and the connecting pipe with the cross-over connection of Part II cooling water, Part I controls offgas outlet temperature at 350 DEG C; It is that in 304 stainless steels, pipe and material are 20 carbon steel outer tubes and are connected with described inner and outer pipes and are connected inlet exhaust gas flange with Part I, offgas outlet flange and the connecting pipe with the cross-over connection of Part I cooling water that Part II comprises material.Part II offgas outlet temperature controls at ~ 200 DEG C.High-temperature tail gas walks interior pipe, and cooling water walks chuck.
Tail gas heat exchanger chuck cooling water adopts the chuck same road hot water with reduction furnace, no longer separately establish water source, cold in-water temperature ~ 140 DEG C, outlet temperature ~ 160 DEG C, tail gas heat exchanger backwater and reduction furnace chuck backwater are delivered to flash tank in the lump and are carried out the low-pressure steam that flash distillation produces 3Bar (g) and be incorporated to steam vapour system.
The tail gas that cooling reaches technological requirement delivers to reduction tail gas recycle operation separating-purifying.
The beneficial effects of the utility model are:
1) structure of the snakelike double pipe heat exchanger of reduction tail gas heat quantity recovery system of the present utility model itself can solve the problem of high-temperature hot stress, avoids fixed tube sheet expansion joint and is easily out of order and the leakage at U-tube formula tube sheet place.
2) reduction tail gas heat quantity recovery system of the present utility model adopts segment design, leading portion high-temperature part adopts a small amount of special material to be combined with ordinary carbon steel, back segment adopts common stainless steel to combine with ordinary carbon steel compared with low temperature part, both ensure that the requirement of potential temperatures involved to material, save again the use amount of special material to greatest extent, with other shell-and-tube heat exchanger commutations than both ensure that process safety again reduced equipment investment.
3) the snakelike double pipe heat exchanger of reduction tail gas heat quantity recovery system of the present utility model can adopt Flange joint any direction to combine according to field condition, convenient layout.
4) cooling water of the tail gas of reduction tail gas heat quantity recovery system of the present utility model adopts the reduction furnace jacket high temperature water of more than ~ 140 degree, the high-temperature-hot-water of more than ~ 160 degree is exported after heat exchange, merge with reduction furnace chuck backwater and send to flash distillation, the low-pressure steam producing 3Bar (g) can be incorporated to full factory low-pressure steam pipe network, effectively utilizes to greatest extent and reclaims heat energy.
Accompanying drawing explanation
Fig. 1 is the structural representation of jacket heat-exchanger of the present utility model a section.
Fig. 2 is the structural representation of jacket heat-exchanger of the present utility model two sections.
Fig. 3 is the overall structure schematic diagram of system of the present utility model.
In figure: 1 is jacket heat-exchanger one section, 2 is jacket heat-exchanger two sections, 3 is jacket heat-exchanger two-step cooling water inlet, 4 is jacket heat-exchanger one-step cooling water out, 5 is jacket heat-exchanger one section of inlet exhaust gas, 6 is jacket heat-exchanger two sections of offgas outlet, 7 is reduction furnace chuck cooling water inlet pipe, 8 is reduction furnace chuck CWR, 9 is jacket heat-exchanger one section of offgas outlet, 10 is jacket heat-exchanger two sections of inlet exhaust gas, 11 is jacket heat-exchanger two-step cooling water out, 12 is jacket heat-exchanger one-step cooling water inlet, 13 is flash tank, 14 is hot water supplying pump.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is further described:
As Fig. 1 to 3; below by embodiment, the utility model is specifically described; what be necessary to herein means out is that following examples are only for being further described the utility model; can not be interpreted as the restriction to the utility model protection domain, the person skilled in the art in this field can make some nonessential improvement and adjustment according to above-mentioned content of the present utility model.
As shown in the figure, a kind of reduction tail gas heat quantity recovery system.Capital equipment comprises the double pipe heat exchanger be directly connected with reduction furnace offgas outlet, the hot water flash evaporation tank, hot water supplying pump and the matching instrument that are connected with double pipe heat exchanger jacket water (J.W.).
A kind of reduction tail gas heat quantity recovery system, comprise the jacket heat-exchanger that is connected with reduction furnace offgas outlet one section 1, the jacket heat-exchanger be connected with jacket heat-exchanger one section two section 2, the jacket heat-exchanger two-step cooling water inlet 3 be connected with jacket heat-exchanger two section of 2 outer tube, the jacket heat-exchanger one-step cooling water out 4 be connected with the outer tube of jacket heat-exchanger one section 1, the jacket heat-exchanger be connected with the reduction furnace offgas outlet mouth of pipe one section of inlet exhaust gas 5, jacket heat-exchanger two sections of offgas outlet 6, reduction furnace chuck cooling water inlet pipe 7, reduction furnace chuck CWR 8, jacket heat-exchanger one section of offgas outlet 9 that jacket heat-exchanger two section of 2 outer tube import is connected, the jacket heat-exchanger two sections of inlet exhaust gas 10 be connected are exported with jacket heat-exchanger one section of 1 outer tube, jacket heat-exchanger two-step cooling water out 11 and jacket heat-exchanger one-step cooling water inlet 12.
Jacket heat-exchanger one section of inlet exhaust gas 5 is by the inlet exhaust gas 10 of two sections of jacket heat-exchanger one section of offgas outlet 9 joint sleeve heat exchanger.Reduction furnace high-temperature tail gas out walks the import 5 of a section of interior pipe through double-tube heat exchanger, enters the inlet exhaust gas 10 of two sections of double-tube heat exchanger with jacket water (J.W.) after being cooled to about 350 degree of temperature from jacket heat-exchanger one section of offgas outlet 9.Be cooled to about 200 degree to send from offgas outlet 6, enter reduction tail gas recycle operation.
Reduction furnace chuck cooling water inlet pipe 7 is communicated with jacket heat-exchanger cooling water inlet 3, and jacket heat-exchanger two-step cooling water out 11 is communicated with jacket heat-exchanger one-step cooling water inlet 12.The cooling water of double pipe heat exchanger causes jacket heat-exchanger cooling water inlet 3 temperature from reduction furnace chuck cooling water inlet pipe 7 and is ~ 140 DEG C, jacket heat-exchanger one-step cooling water inlet 12 is out delivered to from jacket heat-exchanger two-step cooling water out 11, rise to tail gas heat-exchange temperature in sleeve pipe ~ 160 DEG C.
Jacket heat-exchanger one-step cooling water out 4 is communicated with flash tank 13 respectively with reduction furnace chuck CWR 8.Cooling water backwater out goes flash tank 13 flash distillation to produce the low-pressure steam of 3Bar (g) from jacket heat-exchanger one-step cooling water out 4 together with reduction furnace chuck CWR 8, steam is incorporated to full factory low-pressure steam pipe network, and condensed water returns cooling water water-feeding system through hot water supplying pump 14.
Embodiment recited above is only be described preferred embodiment of the present utility model; not design of the present utility model and scope are limited; do not departing under the utility model design concept prerequisite; the various modification that in this area, common engineers and technicians make the technical solution of the utility model and improvement; all should fall into protection domain of the present utility model, the technology contents of the utility model request protection is all recorded in detail in the claims.
Claims (4)
1. a reduction tail gas heat quantity recovery system, it is characterized in that comprising the jacket heat-exchanger one section (1) be connected with reduction furnace offgas outlet, the jacket heat-exchanger be connected with jacket heat-exchanger one section two sections (2), the jacket heat-exchanger two-step cooling water inlet (3) be connected with jacket heat-exchanger two sections of (2) outer tubes, the jacket heat-exchanger one-step cooling water out (4) be connected with the outer tube of jacket heat-exchanger one section (1), the jacket heat-exchanger be connected with the reduction furnace offgas outlet mouth of pipe one section of inlet exhaust gas (5), jacket heat-exchanger two sections of offgas outlet (6), reduction furnace chuck cooling water inlet pipe (7), reduction furnace chuck CWR (8), jacket heat-exchanger one section of offgas outlet (9) that jacket heat-exchanger two sections of (2) outer tube imports are connected, the jacket heat-exchanger two sections of inlet exhaust gas (10) be connected are exported with jacket heat-exchanger one section of (1) outer tube, jacket heat-exchanger two-step cooling water out (11) and jacket heat-exchanger one-step cooling water inlet (12).
2. reduction tail gas heat quantity recovery system according to claim 1, is characterized in that the inlet exhaust gas (10) of two section of described jacket heat-exchanger one section of inlet exhaust gas (5) by jacket heat-exchanger one section of offgas outlet (9) joint sleeve heat exchanger.
3. reduction tail gas heat quantity recovery system according to claim 1, it is characterized in that described reduction furnace chuck cooling water inlet pipe (7) is communicated with jacket heat-exchanger cooling water inlet (3), jacket heat-exchanger two-step cooling water out (11) is communicated with jacket heat-exchanger one-step cooling water inlet (12).
4. reduction tail gas heat quantity recovery system according to claim 1, is characterized in that described jacket heat-exchanger one-step cooling water out (4) is communicated with flash tank (13) respectively with reduction furnace chuck CWR (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420722101.5U CN204346215U (en) | 2014-11-26 | 2014-11-26 | Reduction tail gas heat quantity recovery system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420722101.5U CN204346215U (en) | 2014-11-26 | 2014-11-26 | Reduction tail gas heat quantity recovery system |
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| CN204346215U true CN204346215U (en) | 2015-05-20 |
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| CN201420722101.5U Active CN204346215U (en) | 2014-11-26 | 2014-11-26 | Reduction tail gas heat quantity recovery system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108020104A (en) * | 2016-10-31 | 2018-05-11 | 中国石油化工股份有限公司 | Catalytic cracking catalyst is spray-dried the heat reclaiming system and its method of tail gas |
| CN109682205A (en) * | 2018-12-13 | 2019-04-26 | 福建荣华科技有限公司 | Energy-saving sintering furnace and LiFePO4 process units |
-
2014
- 2014-11-26 CN CN201420722101.5U patent/CN204346215U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108020104A (en) * | 2016-10-31 | 2018-05-11 | 中国石油化工股份有限公司 | Catalytic cracking catalyst is spray-dried the heat reclaiming system and its method of tail gas |
| CN109682205A (en) * | 2018-12-13 | 2019-04-26 | 福建荣华科技有限公司 | Energy-saving sintering furnace and LiFePO4 process units |
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| GR01 | Patent grant |