CN114754348A - Vacuum deoxidization system - Google Patents
Vacuum deoxidization system Download PDFInfo
- Publication number
- CN114754348A CN114754348A CN202210416472.XA CN202210416472A CN114754348A CN 114754348 A CN114754348 A CN 114754348A CN 202210416472 A CN202210416472 A CN 202210416472A CN 114754348 A CN114754348 A CN 114754348A
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- Prior art keywords
- vacuum
- waste heat
- heat recovery
- recovery tower
- pipeline
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0014—Recuperative heat exchangers the heat being recuperated from waste air or from vapors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F25/00—Component parts of trickle coolers
- F28F25/02—Component parts of trickle coolers for distributing, circulating, and accumulating liquid
- F28F25/06—Spray nozzles or spray pipes
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention relates to a vacuum deoxygenation system, which belongs to the technical field of deoxygenation equipment and comprises a deoxygenator, a vacuum deoxygenation waste heat recovery tower, a first pipeline and a second pipeline; the upper part of the deaerator is used for introducing steam into the bottom of the vacuum deaerating waste heat recovery tower through a first pipeline; the upper part of the vacuum deoxidization waste heat recovery tower is communicated with a water inlet pipe; the top of the vacuum deoxidization waste heat recovery tower is communicated with an exhaust pipe; the second pipeline conveys the deposition water liquid in the vacuum deoxidization waste heat recovery tower back to the deaerator through a hot water circulating pump. The deaerator introduces steam into the vacuum deaerating waste heat recovery tower through a first pipeline, introduces water from a water inlet pipe at the top of the tower to exchange heat with the steam, and discharges non-condensable gas through an exhaust pipe at the top of the tower; the heated water liquid is subjected to primary vacuum deoxidization in a vacuum deoxidization waste heat recovery tower and then enters a deaerator through a second pipeline under the action of a hot water circulating pump for secondary deoxidization; while the oxygen removal efficiency is further improved, heat generation is recovered for reducing the gas solubility.
Description
Technical Field
The invention belongs to the technical field of deoxygenation equipment, and particularly relates to a vacuum deoxygenation system.
Background
At present, most of heat source plants providing steam use a steam deaerator as a deaerating device, and the purpose of deaerating is to discharge water-soluble oxygen and other gases to the outside, so as to prevent and reduce corrosion of boiler feed pipes, coal economizers and other accessory equipment. A large amount of steam is discharged to the atmosphere along with the process of removing oxygen, thereby causing energy waste.
Disclosure of Invention
In order to solve the problem of energy waste caused by outward discharge of steam, the invention provides a vacuum deoxygenation system.
The invention is realized by the following technical scheme:
a vacuum deoxygenation system comprises a deoxygenator, a vacuum deoxygenation waste heat recovery tower, a first pipeline and a second pipeline;
the upper part of the deaerator is used for introducing steam into the bottom of the vacuum deaerating waste heat recovery tower through the first pipeline;
the upper part of the vacuum deoxidization waste heat recovery tower is communicated with a water inlet pipe for carrying out heat exchange on steam in the vacuum deoxidization waste heat recovery tower;
the top of the vacuum oxygen-removing waste heat recovery tower is communicated with an exhaust pipe which discharges non-condensable gas in the vacuum oxygen-removing waste heat recovery tower outwards;
and the second pipeline conveys the deposition water liquid in the vacuum deoxidization waste heat recovery tower back to the deaerator through a hot water circulating pump.
The deaerator introduces steam into the vacuum deaerating waste heat recovery tower through a first pipeline, introduces the steam into the vacuum deaerating waste heat recovery tower through a water inlet pipe at the top of the tower for heat exchange with the steam, and discharges non-condensable gas through an exhaust pipe at the top of the tower; the heated water liquid is subjected to primary vacuum deoxidization in a vacuum deoxidization waste heat recovery tower and then enters a deaerator through a second pipeline under the action of a hot water circulating pump for secondary deoxidization; while the oxygen removal efficiency is further improved, heat generation is recovered for reducing the gas solubility.
The invention is further improved in that a return pipe communicated with the upper part of the vacuum deoxidization waste heat recovery tower is arranged on the backward second pipeline of the hot water circulating pump, and a return valve is arranged on the return pipe. Excessive deposited water liquid is prevented from entering the deaerator, returning to the vacuum deaerating waste heat recovery tower through the return pipe, and contacting with steam in the falling process from a high place to form an auxiliary effect on the separation of non-condensable gas.
In a further improvement of the present invention, a second valve is provided in the second duct in which the return pipe flows rearward. And by closing the second valve, a second pipeline at the front end of the second valve, a return pipe and the vacuum oxygen removal waste heat recovery tower form a circulating pipeline.
The invention is further improved in that a second spray header communicated with a return pipe is arranged in the vacuum deoxidization waste heat recovery tower. The deposited water liquid returning to the vacuum oxygen-removing waste heat recovery tower increases the contact area with the steam under the action of the second spray header.
The invention further improves the deaerator, and a steam discharge pipe is arranged at the top of the deaerator and is provided with an automatic steam exhaust valve. If the internal pressure of the deaerator is higher than 10kpa, the automatic steam exhaust valve is opened, and otherwise, the automatic steam exhaust valve is closed; prevent that steam from outwards discharging at will through the steam vent pipe, prevent simultaneously that atmosphere outside gas from getting into the influence operation in the system and reducing vacuum deoxidization effect.
In a further improvement of the present invention, the first pipeline is communicated with a steam discharge pipe between the automatic steam exhaust valve and the deaerator. The purpose of reasonable layout is achieved.
In a further improvement of the present invention, the exhaust pipe is provided with a vacuum pump. The pressure was reduced by a vacuum pump to reduce the oxygen solubility.
The invention is further improved in that a first spray header communicated with a water inlet pipe is arranged in the vacuum deoxidization waste heat recovery tower. The contact area of external water and steam is increased through the first spray header, so that the heat exchange efficiency is improved.
According to the technical scheme, the invention has the beneficial effects that: the deaerator introduces steam into the vacuum deaerating waste heat recovery tower through a first pipeline, introduces water from a water inlet pipe at the top of the tower to exchange heat with the steam, and discharges non-condensable gas through an exhaust pipe at the top of the tower; the heated water liquid is subjected to primary vacuum deoxidization in a vacuum deoxidization waste heat recovery tower and then enters a deaerator through a second pipeline under the action of a hot water circulating pump for secondary deoxidization; while the oxygen removal efficiency is further improved, the generated heat is recovered for reducing the gas solubility.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
In the drawings: 1. a deaerator, 2, a vacuum deaerating waste heat recovery tower, 3, a first pipeline, 4, a second pipeline, 41, a second valve, 42, a hot water circulating pump, 5, a steam discharge pipe, 51, an automatic exhaust steam valve, 6, a return pipe, 61, a return valve, 62, a second spray header, 7, an exhaust pipe, 71, a vacuum pump, 8, a water inlet pipe, 81, a water inlet valve, 82 and a first spray header.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the present embodiment, and it is apparent that the embodiments described below are only a part of embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of protection of this patent.
As shown in the attached drawing, the vacuum deoxygenation system comprises a deoxygenator 1, a vacuum deoxygenation waste heat recovery tower 2, a first pipeline 3 and a second pipeline 4.
The top of the deaerator 1 is provided with a steam discharge pipe 5, and the steam discharge pipe 5 is provided with an automatic steam exhaust valve 51. If the internal pressure of the deaerator 1 is higher than 10kpa, the automatic steam exhaust valve 51 is opened, otherwise, the automatic steam exhaust valve is closed; prevent that steam from outwards discharging at will through steam discharge pipe 5, prevent simultaneously that atmospheric outside gas from getting into the influence operation in the system and reducing vacuum deoxidization effect. The first pipeline 3 is communicated with a steam discharge pipe 5 between the automatic steam exhaust valve 51 and the deaerator 1. The purpose of reasonable layout is achieved.
And the upper part of the deaerator 1 is used for introducing steam into the bottom of the vacuum deaerating waste heat recovery tower 2 through a first pipeline 3. The deaerator 1 introduces steam into the vacuum deaerating waste heat recovery tower 2 through the first pipeline 3 to wait for heat source recovery of the steam.
The upper part of the vacuum deoxidization waste heat recovery tower 2 is communicated with a water inlet pipe 8 for carrying out heat exchange on steam in the vacuum deoxidization waste heat recovery tower, and a water inlet valve 81 is arranged on the water inlet pipe 8; the water is introduced from the water inlet pipe 8 at the tower top to exchange heat with the steam. A first spray header 82 communicated with the water inlet pipe 8 is arranged in the vacuum deoxidization waste heat recovery tower 2. The contact area of the external water and the steam is increased by the first spray header 82 to improve the heat exchange efficiency.
The top of the vacuum deoxygenation waste heat recovery tower 2 is communicated with an exhaust pipe 7 for discharging non-condensable gas in the vacuum deoxygenation waste heat recovery tower outwards; the non-condensable gas is discharged through an exhaust pipe 7 at the top of the tower. The exhaust pipe 7 is provided with a vacuum pump 71. The pressure is reduced by vacuum pump 71 to reduce the oxygen solubility. The vacuum pump 71 is matched with the automatic exhaust valve 51 for use, and when the automatic exhaust valve 51 is opened, the vacuum pump 71 stops running; and vice versa.
The second pipeline 4 conveys the settled water liquid in the vacuum deoxygenation waste heat recovery tower 2 back to the deoxygenator 1 through a hot water circulating pump 42. The heated water liquid is subjected to primary vacuum deoxidization in a vacuum deoxidization waste heat recovery tower 2, and then enters a deaerator 1 through a second pipeline 4 under the action of a hot water circulating pump 42 to be subjected to secondary deoxidization; while the oxygen removal efficiency is further improved, heat generation is recovered for reducing the gas solubility.
And a return pipe 6 communicated with the upper part of the vacuum deoxidization waste heat recovery tower 2 is arranged on the second pipeline 4 at the flowing direction rear part of the hot water circulating pump 42, and a return valve 61 is arranged on the return pipe 6. Excessive deposited water liquid is prevented from entering the deaerator 1, returning to the vacuum deaerating waste heat recovery tower 2 through the return pipe 6, and contacting with steam in the falling process from a high place to form an auxiliary effect on the separation of non-condensable gas.
A second valve 41 is arranged on the second pipeline 4 of the return pipe 6 which flows backwards. By closing the second valve 41, the second pipeline 4 at the front end of the second valve 41, the return pipe 6 and the vacuum oxygen-removing waste heat recovery tower 2 form a circulation pipeline. And a second spray header 62 communicated with the return pipe 6 is arranged in the vacuum deoxidization waste heat recovery tower 2. The deposition water liquid returned to the vacuum oxygen-removing waste heat recovery tower 2 increases the contact area with the steam under the action of the second spray header 62.
The water entering the vacuum oxygen removal waste heat recovery tower 2 through the water inlet pipe 8 is specifically demineralized water, and the initial temperature of the demineralized water entering the vacuum oxygen removal waste heat recovery tower 2 is heated from 15-40 ℃ to 50-95 ℃. To improve the oxygen scavenging effect.
To sum up, the principle of the system: firstly, the partial pressure of gas on the water surface is reduced by utilizing vacuum, the lower the pressure is, the smaller the solubility of the gas in the water is, and the larger the gas is otherwise; and secondly, the temperature of the water entering the deaerator 1 is increased, namely the higher the temperature of the water is, the smaller the solubility of the oxygen-containing gas in the water is, and when the temperature is the saturation temperature under the corresponding working pressure, the solubility of the oxygen-containing gas in the water is zero. The steam discharged from the deaerator 1 is used to heat the water liquid, and the vacuum pump 71 is used to reduce the partial pressure of the water liquid containing oxygen to improve the deaerating effect. The recovery of the steam in the deoxidization process is solved, and the deoxidization effect of the deaerator 1 is improved simultaneously.
According to the vacuum deoxygenation system, steam is introduced into a vacuum deoxygenation waste heat recovery tower through a deoxygenator through a first pipeline, water is introduced into the vacuum deoxygenation waste heat recovery tower through a water inlet pipe at the top of the tower to exchange heat with the steam, and non-condensable gas is discharged through an exhaust pipe at the top of the tower; the heated water liquid is subjected to primary vacuum deoxidization in a vacuum deoxidization waste heat recovery tower and then enters a deaerator through a second pipeline under the action of a hot water circulating pump for secondary deoxidization; while the oxygen removal efficiency is further improved, heat generation is recovered for reducing the gas solubility.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The terms "upper", "lower", "outside", "inside" and the like in the description and claims of the present invention and the above drawings are used for distinguishing relative positions if any, and are not necessarily given qualitatively. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A vacuum deoxygenation system is characterized by comprising a deoxygenator (1), a vacuum deoxygenation waste heat recovery tower (2), a first pipeline (3) and a second pipeline (4);
the upper part of the deaerator (1) leads steam to the bottom of the vacuum deaerating waste heat recovery tower (2) through the first pipeline (3);
the upper part of the vacuum deoxidization waste heat recovery tower (2) is communicated with a water inlet pipe (8) for carrying out heat exchange on steam in the vacuum deoxidization waste heat recovery tower;
the top of the vacuum oxygen-removing waste heat recovery tower (2) is communicated with an exhaust pipe (7) which discharges non-condensable gas in the vacuum oxygen-removing waste heat recovery tower outwards;
and the second pipeline (4) conveys the deposition water liquid in the vacuum deoxygenation waste heat recovery tower (2) back to the deoxygenator (1) through a hot water circulating pump (42).
2. The vacuum oxygen removal system as claimed in claim 1, wherein a return pipe (6) communicated with the upper part of the vacuum oxygen removal waste heat recovery tower (2) is arranged on the second pipeline (4) of the hot water circulating pump (42) flowing to the rear, and a return valve (61) is arranged on the return pipe (6).
3. The vacuum oxygen removal system according to claim 2, wherein a second valve (41) is provided on the second duct (4) of the return pipe (6) which flows backward.
4. The vacuum oxygen removal system as claimed in claim 2, wherein a second spray header (62) connected to the return pipe (6) is disposed in the vacuum oxygen removal waste heat recovery tower (2).
5. The vacuum deoxygenation system according to claim 1, characterized in that a steam discharge pipe (5) is arranged on the top of the deoxygenator (1), and an automatic steam exhaust valve (51) is arranged on the steam discharge pipe (5).
6. Vacuum oxygen removal system according to claim 5, characterized in that the first conduit (3) communicates with the steam discharge pipe (5) between the automatic steam exhaust valve (51) and the oxygen remover (1).
7. The vacuum oxygen removal system according to claim 1 or 5, wherein the exhaust pipe (7) is provided with a vacuum pump (71).
8. The vacuum oxygen removal system as claimed in claim 1, wherein a first spray header (82) communicated with the water inlet pipe (8) is arranged in the vacuum oxygen removal waste heat recovery tower (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210416472.XA CN114754348A (en) | 2022-04-20 | 2022-04-20 | Vacuum deoxidization system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210416472.XA CN114754348A (en) | 2022-04-20 | 2022-04-20 | Vacuum deoxidization system |
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| Publication Number | Publication Date |
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| CN114754348A true CN114754348A (en) | 2022-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210416472.XA Pending CN114754348A (en) | 2022-04-20 | 2022-04-20 | Vacuum deoxidization system |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102092809A (en) * | 2009-12-09 | 2011-06-15 | 上海晟煜科贸有限公司 | Vacuum thermal deoxidizing device |
| CN201909558U (en) * | 2011-01-11 | 2011-07-27 | 吴舒克 | Energy-saving deaerator waste heat recovery apparatus |
| CN202546730U (en) * | 2012-04-01 | 2012-11-21 | 浙江航民股份有限公司 | Atmospheric deoxidation system capable of recovering exhaust steam |
| CN103499089A (en) * | 2013-09-25 | 2014-01-08 | 济南澳海炭素有限公司 | Exhaust steam recycling heating device for waste heat power generation deaerator |
| CN203549781U (en) * | 2013-08-01 | 2014-04-16 | 厦门恒效节能科技有限公司 | Waste heat deaerator |
| US20210239326A1 (en) * | 2019-03-25 | 2021-08-05 | Dalian University Of Technology | Energy-saving system using electric heat pump to deeply recover flue gas waste heat from heat power plant for district heating |
-
2022
- 2022-04-20 CN CN202210416472.XA patent/CN114754348A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102092809A (en) * | 2009-12-09 | 2011-06-15 | 上海晟煜科贸有限公司 | Vacuum thermal deoxidizing device |
| CN201909558U (en) * | 2011-01-11 | 2011-07-27 | 吴舒克 | Energy-saving deaerator waste heat recovery apparatus |
| CN202546730U (en) * | 2012-04-01 | 2012-11-21 | 浙江航民股份有限公司 | Atmospheric deoxidation system capable of recovering exhaust steam |
| CN203549781U (en) * | 2013-08-01 | 2014-04-16 | 厦门恒效节能科技有限公司 | Waste heat deaerator |
| CN103499089A (en) * | 2013-09-25 | 2014-01-08 | 济南澳海炭素有限公司 | Exhaust steam recycling heating device for waste heat power generation deaerator |
| US20210239326A1 (en) * | 2019-03-25 | 2021-08-05 | Dalian University Of Technology | Energy-saving system using electric heat pump to deeply recover flue gas waste heat from heat power plant for district heating |
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