CN107990301A - Waste heat boiler feedwater deaerating system - Google Patents
Waste heat boiler feedwater deaerating system Download PDFInfo
- Publication number
- CN107990301A CN107990301A CN201711467463.9A CN201711467463A CN107990301A CN 107990301 A CN107990301 A CN 107990301A CN 201711467463 A CN201711467463 A CN 201711467463A CN 107990301 A CN107990301 A CN 107990301A
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- oxygen
- eliminating device
- end surfaces
- feed pump
- outlet
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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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Degasification And Air Bubble Elimination (AREA)
- Physical Water Treatments (AREA)
Abstract
The present invention relates to a kind of waste heat boiler feedwater deaerating system.The present invention includes low-pressure drum, back-end surfaces, first feed pump, second feed pump, using the first oxygen-eliminating device of vacuum type deoxygenation, the second oxygen-eliminating device being connected with low-pressure drum, second oxygen-eliminating device is connected using integral type thermal de-aeration and with back-end surfaces, back-end surfaces is monoblock type heating surfaces and are equipped with heat supply outlet and deaeration in condenser heated water outlet, deaeration in condenser heated water outlet and the first feed pump are connected with the first oxygen-eliminating device, first oxygen-eliminating device is connected with the second feed pump, and the second feed pump is connected with back-end surfaces.The present invention is combined with integral type thermal de-aeration using vacuum type deoxygenation, back-end surfaces monoblock type is arranged, solves that boiler output existing in the prior art is low, exhaust gas temperature is higher and back-end surfaces are perishable, the technical problem such as heating surface dry combustion method under non-supplying thermal condition.
Description
Technical field
The present invention relates to a kind of waste heat boiler feedwater deaerating system, belong to station boiler equipment technical field.
Background technology
With the continuous change of power plant's heat demand, especially to steam heating demand be on the increase and heat supply distance
Become remote, the steam discharge of steam turbine is used for heat supply and non-recycling in more and more projects, this results in combustion engine and was running
Substantial amounts of feedwater is required supplementation with journey.Since the feedwater of supplement is the very high demineralized water of oxygen content, demineralized water is supplemented in full capacity
In the case of, the oxygen content of feedwater will exceed 5000ppb, be far longer than the oxygen-containing national standard for being necessarily less than 50ppb of feedwater, and
Integral type thermal deaerator positioned at low-pressure drum upper end obviously also can not directly reduce the feedwater oxygen content more than 5000ppb
To below 7ppb, this steam oxygen content for allowing for low-pressure drum generation is also difficult to be up to state standards（GB12145-1999《Fire
Power generator group and apparatus of steam power plants Water Vapor Quality standard》It is required that：It is small that steam oxygen content is less than 7ppb, boiler feedwater oxygen content
In 50ppb）.In order to solve the problems, such as the deoxygenation of feedwater, existing solution is：The port of export of first feed pump 3 sets air
Formula thermal deaerator 90, from low-pressure drum 1 draw all the way steam as heat source be used for atmospheric type deaerator 90 will come from first to
20 DEG C or so of feedwater of water pump（Oxygen content is more than 5000ppb）104 DEG C of progress thermal de-aerations are heated to, by the oxygen content of feedwater
It is reduced to and is up to state standards, the back-end surfaces of boiler is added independent supplying hot water heating surface 81 in addition to the heating surface 80 that feeds water and used
In reducing afterbody smoke temperature, feedwater after 90 deoxygenation of atmosphere-type thermodynamic oxygen remover is up to standard by the second feed pump 4 be sent into feedwater by
Hot face 80 enters low-pressure drum 1 after heating up（As shown in Figure 1）.This technical solution by atmospheric-type thermodynamic deoxidizing, although
Solves the problems, such as the feedwater deaeration in the case of full capacity supplement demineralized water, but also there are following shortcoming in the process of running：
Carrying out atmospheric-type thermodynamic deoxidizing needs to be used as heat source from extraction saturated vapor to the atmosphere-type thermodynamic oxygen remover 90 of low-pressure drum 1
For deoxygenation, the consuming of saturated vapor causes the reduction of boiler output；
Due to feeding water, the water temperature in deoxygenation is heated to 104 DEG C, thus feedwater heating surface 80 and the heat exchange of flue gas are less, cause
Exhaust gas temperature raises, and combustion engine operational efficiency declines；
81 heat capacity of supplying hot water heating surface independently arranged is relatively low, and the supplying hot water in supplying hot water heating surface 81 because without except
Oxygen and oxygen content is very high, the 81 oxidizable corrosion of supplying hot water heating surface；Supplying hot water heating surface 81 is in dry combustion method under non-supplying thermal condition
State, while security risk is brought to unit operation, improves combustion engine exhaust back pressure, reduces unit output.
The content of the invention
Boiler output of the present invention mainly present in the solution prior art is low, high fume temperature and supplying hot water heating surface are easy
Burn into dry combustion method brings the technical problem of security risk to unit operation, there is provided a kind of boiler output is higher, exhaust gas temperature is relatively low and
It is not in the dry combustion method phenomenon thus safer efficient waste heat boiler feedwater deaeration of unit operation that supplying hot water heating surface, which is not easy burn into,
System.
The present invention is mainly what is be addressed by following technical proposals for above-mentioned technical problem：The present invention includes low pressure
Drum, the back-end surfaces equipped with least one heat supply outlet, the first feed pump that entrance is connected with exterior feedwater, entrance and
The first oxygen-eliminating device that first feedwater pump discharge is connected, the second feed pump that entrance is connected with the outlet of the first oxygen-eliminating device, it is special
Sign is：First oxygen-eliminating device uses vacuum type oxygen-eliminating device, further includes the second oxygen-eliminating device that outlet is connected with low-pressure drum, and second
Oxygen-eliminating device entrance is connected with back-end surfaces outlet, and back-end surfaces heat water for monoblock type heating surface and equipped with deaeration in condenser
Outlet, deaeration in condenser heated water outlet are connected with the first oxygen-eliminating device entrance, the second feedwater pump discharge and back-end surfaces entrance
It is connected, the second oxygen-eliminating device uses integral type thermal deaerator.
Preferably, the first oxygen-eliminating device is included to water heating pipe, to water heating pipe one end and the first feedwater pump discharge and very
Empty deoxygenation heated water outlet is connected and the other end is connected with the first oxygen-eliminating device entrance.
Preferably, heat supply water out is arranged at back-end surfaces by design temperature.
Therefore, advantages of simple of the present invention, has the following advantages：
The present invention is provided with the first oxygen-eliminating device in the port of export of the first feed pump, and the first oxygen-eliminating device uses vacuum type oxygen-eliminating device,
Low-pressure drum top is provided with the second oxygen-eliminating device, and the second oxygen-eliminating device uses integral type thermal deaerator, the high feedwater of oxygen content
First pass through the first feed pump and carry out vacuum type deoxygenation into the first oxygen-eliminating device, passed through after feedwater oxygen content is reduced to below 50ppb
Second feedwater is pumped into back-end surfaces, and the second oxygen-eliminating device is entered after back-end surfaces heat temperature raising and carries out thermal de-aeration, warp
The oxygen content that feeds water after second oxygen-eliminating device deoxygenation reaches below 7ppb and enters low-pressure drum.Due to what is required during the first oxygen-eliminating device deoxygenation
Feed temperature only needs 45 DEG C or so, thus only need to extract part supplying hot water from the deaeration in condenser heated water outlet of back-end surfaces and make
The feedwater from the first feed pump can be can be heated to 45 DEG C or so for heat source, the feedwater after deaeration in condenser is heated through afterbody
After the heat temperature raising in face, the oxygen content of feedwater need to can only be dropped with a small amount of steam when carrying out thermal de-aeration into the second oxygen-eliminating device
To below 7ppb.Therefore, the present invention is used as heat when carrying out feedwater deaeration without expending substantial amounts of saturated vapor in low-pressure drum
Source, ensures that boiler has higher output.
The back-end surfaces of the present invention use monoblock type heating surface, since supplying hot water and feedwater share back-end surfaces, tail
Portion's heating surface preferably sets the heat supply water out of multiple and different design temperatures to be used for heat supply, it is thus achieved that heating parameter is more
Sample, can be multiple parametric user's supplying hot water at the same time；Simultaneously as the first oxygen-eliminating device is passed through in the feedwater into back-end surfaces
Oxygen content is down to below 50ppb after deoxygenation, avoids the back-end surfaces occurred in the prior art because supplying hot water oxygen content is high
Seriously corroded is caused to bring the technical problems such as security risk to unit operation；When unit is in not supplying thermal condition, due to afterbody
Heating surface can be completely used for heating feedwater, thus avoid and be placed in the prior art since supplying hot water heating surface does not work in flue
Dry combustion method and add flue gas resistance, cause combustion engine back pressure rise, Power Plant Gas Turbine generated output decline the problems such as appearance.
In the present invention, after the first oxygen-eliminating device deoxygenation into back-end surfaces feedwater water temperature at 45 DEG C or so, afterbody
Heating surface can sufficiently be exchanged heat with flue gas, exhaust gas temperature can be reduced under heat supply or non-supplying thermal condition 90 DEG C with
Under, thus compared with prior art, the present invention boiler output and operational efficiency are obtained for and are greatly improved.
Brief description of the drawings
Attached drawing 1 is the system schematic of the prior art；
Attached drawing 2 is the system schematic of present pre-ferred embodiments；
Attached drawing 3 is the flow diagram to feed water during vacuum type deoxygenation in present pre-ferred embodiments shown in attached drawing 2.
Embodiment
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.
Embodiment 1：As shown in attached drawing 2, attached drawing 3, the present invention includes low-pressure drum 1, back-end surfaces 2, entrance and outside
Feed water the first feed pump 3 being connected, the second feed pump 4, the first oxygen-eliminating device 5, exports second to be connected with low-pressure drum 1 and removes
Oxygen device 6, the first oxygen-eliminating device 5 use vacuum type oxygen-eliminating device, and the second oxygen-eliminating device 6 uses integral type thermal deaerator；
Back-end surfaces 2 are monoblock type heating surface, and outlet is connected with 6 entrance of the second oxygen-eliminating device, and back-end surfaces 2 are equipped with heat supply
Outlet 21 and deaeration in condenser heated water outlet 22, heat supply outlet 21 are arranged on each water of back-end surfaces 2 by setting heat supply water temperature
Temperature section, 2 entrance of back-end surfaces are connected with the outlet of the second feed pump 4；
First oxygen-eliminating device 5 is provided with to water heating pipe 51, to 51 entrance of water heating pipe and the outlet of the first feed pump 3 and deoxygenation heat supply
Mouth 22 is connected, and exports to water heating pipe 51 and is connected with 5 entrance of the first oxygen-eliminating device, the outlet of the first oxygen-eliminating device 5 and the second feedwater
4 entrances are pumped to be connected.
When unit operation, the high demineralized water of oxygen content passes through true with coming to water heating pipe 51 through the first feed pump 3
Enter the first oxygen-eliminating device 5 after the supplying hot water mixing heating of empty deoxygenation heated water outlet 22 and carry out vacuum type deoxygenation, oxygen content reduces
Enter back-end surfaces 2 through the second feed pump 4 after to below 50ppb, the second deoxygenation is entered after 2 heat temperature raising of back-end surfaces
Device 6 carries out thermal de-aeration, enters low-pressure drum 1 after oxygen content is reduced to 7ppb, completes the deoxygenation workflow of boiler feedwater.
Since present invention employs vacuum type oxygen-eliminating device, need to be only heated to by carrying out the feedwater of deoxygenation by 45 DEG C or so, by being heated in afterbody
Part supplying hot water is extracted in face 2 can meet the water temperature requirement of vacuum type deoxygenation as deoxygenation heat source, without being extracted from low-pressure drum 1
Steam substantially increases the output of low-pressure drum 1 as deoxygenation heat source；Simultaneously because back-end surfaces 2 for monoblock type by
Hot face, supplying hot water and feedwater share back-end surfaces 2, and back-end surfaces 2 and flue gas heat exchange are abundant, can be reduced to exhaust gas temperature
Within 90 DEG C, thus compared with air suspended type deoxygenation scheme of the prior art, the present invention can put forward the operational efficiency of waste heat boiler
It is high by more than 4%；
For the present invention when unit is in supplying thermal condition, supplying hot water can choose the heat supply for being distributed in back-end surfaces 2 according to demand
Outlet 21 is used as intake, and heat supply outlet 21 can meet heat demand of the temperature between 60 DEG C to 175 DEG C.So as to solve
Independently arranged due to supplying hot water heating surface in the prior art and cause that heating parameter is single, ability is relatively low and supplying hot water oxygen content
High the problem of causing supplying hot water heating surface oxidation corrosion serious.
When unit is in not supplying thermal condition, back-end surfaces 2 are completely used for heating and feed water to low-pressure drum 1 present invention,
Boiler capacity is improved, adds power plant's entirety generated output, while is avoided in the prior art due to afterbody independence cloth
The supplying hot water heating surface put does not work, and being completely disposed at dry combustion method in flue influences heating surface safety, and the heating surface due to dry combustion method
Flue gas resistance is added in flue, causes combustion engine back pressure to raise, the problems such as generated output of Power Plant Gas Turbine declines goes out
It is existing.
Certainly, above-mentioned drawings and examples, can not be as the present invention not only for of the invention for explanation and illustration
Work as restriction.All those skilled in the art make equivalent or equivalent adjustment according to the present invention and fall with technical solution obtained from change
Enter protection scope of the present invention.
Claims (3)
1. a kind of waste heat boiler feedwater deaerating system, including low-pressure drum（1）, exported equipped with least one heat supply（21）Afterbody
Heating surface（2）, the first feed pump that entrance and exterior feedwater are connected（3）, entrance and first feed pump（3）Outlet is connected
The first oxygen-eliminating device connect（5）, entrance and first oxygen-eliminating device（5）Export the second feed pump being connected（4）, its feature exists
In：First oxygen-eliminating device（5）Using vacuum type oxygen-eliminating device, outlet and the low-pressure drum are further included（1）Second to be connected
Oxygen-eliminating device（6）, second oxygen-eliminating device（6）Entrance and the back-end surfaces（2）Outlet is connected, the back-end surfaces
（2）For monoblock type heating surface and it is equipped with deaeration in condenser heated water outlet（22）, the deaeration in condenser heated water outlet（22）With institute
State the first oxygen-eliminating device（5）Entrance is connected, second feed pump（4）Outlet and the back-end surfaces（2）Entrance is connected,
Second oxygen-eliminating device（6）Using integral type thermal deaerator.
A kind of 2. waste heat boiler feedwater deaerating system according to claim 1, it is characterised in that：First oxygen-eliminating device
（5）Including to water heating pipe（51）, it is described to give water heating pipe（51）One end and first feed pump（3）Outlet and the vacuum
Deoxygenation heated water outlet（22）It is connected and the other end and first oxygen-eliminating device（5）Entrance is connected.
A kind of 3. waste heat boiler feedwater deaerating system according to claim 1 or 2, it is characterised in that：The heat supply outlet
（21）The back-end surfaces are arranged at by design temperature（2）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711467463.9A CN107990301B (en) | 2017-12-28 | 2017-12-28 | Water supply and oxygen removal system of waste heat boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711467463.9A CN107990301B (en) | 2017-12-28 | 2017-12-28 | Water supply and oxygen removal system of waste heat boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107990301A true CN107990301A (en) | 2018-05-04 |
| CN107990301B CN107990301B (en) | 2022-12-02 |
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ID=62042146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711467463.9A Active CN107990301B (en) | 2017-12-28 | 2017-12-28 | Water supply and oxygen removal system of waste heat boiler |
Country Status (1)
| Country | Link |
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| CN (1) | CN107990301B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109869710A (en) * | 2019-03-14 | 2019-06-11 | 东方菱日锅炉有限公司 | Waste heat boiler tail portion deoxygenation heating system |
| CN110726133A (en) * | 2019-09-26 | 2020-01-24 | 首钢京唐钢铁联合有限责任公司 | Method and device for reducing dissolved oxygen in water supply of CCPP (combined cycle process control) waste heat boiler |
| CN114060796A (en) * | 2021-11-02 | 2022-02-18 | 中国船舶重工集团公司第七0三研究所 | Take exhaust-heat boiler extension economizer system of one-level deoxidization heat source |
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| CN2150452Y (en) * | 1993-02-13 | 1993-12-22 | 马春元 | De-aeration water-heating boiler |
| CN103388817A (en) * | 2013-07-16 | 2013-11-13 | 广西华锐钢铁工程设计咨询有限责任公司 | Residual heat recovery system of sewage water of coke dry quenching boiler |
| JP2015212585A (en) * | 2014-05-01 | 2015-11-26 | 株式会社サムソン | Boiler having water-supplying and degasifying device |
| CN204853436U (en) * | 2015-07-21 | 2015-12-09 | 西安华江环保科技股份有限公司 | LNG waste boiler steam pocket feedwater deoxidization system |
| CN207797003U (en) * | 2017-12-28 | 2018-08-31 | 东方菱日锅炉有限公司 | Waste heat boiler feedwater deaerating system |
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2017
- 2017-12-28 CN CN201711467463.9A patent/CN107990301B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2150452Y (en) * | 1993-02-13 | 1993-12-22 | 马春元 | De-aeration water-heating boiler |
| CN103388817A (en) * | 2013-07-16 | 2013-11-13 | 广西华锐钢铁工程设计咨询有限责任公司 | Residual heat recovery system of sewage water of coke dry quenching boiler |
| JP2015212585A (en) * | 2014-05-01 | 2015-11-26 | 株式会社サムソン | Boiler having water-supplying and degasifying device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109869710A (en) * | 2019-03-14 | 2019-06-11 | 东方菱日锅炉有限公司 | Waste heat boiler tail portion deoxygenation heating system |
| CN110726133A (en) * | 2019-09-26 | 2020-01-24 | 首钢京唐钢铁联合有限责任公司 | Method and device for reducing dissolved oxygen in water supply of CCPP (combined cycle process control) waste heat boiler |
| CN114060796A (en) * | 2021-11-02 | 2022-02-18 | 中国船舶重工集团公司第七0三研究所 | Take exhaust-heat boiler extension economizer system of one-level deoxidization heat source |
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| Publication number | Publication date |
|---|---|
| CN107990301B (en) | 2022-12-02 |
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