CN109869710A - Waste heat boiler tail portion deoxygenation heating system - Google Patents
Waste heat boiler tail portion deoxygenation heating system Download PDFInfo
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- CN109869710A CN109869710A CN201910194201.2A CN201910194201A CN109869710A CN 109869710 A CN109869710 A CN 109869710A CN 201910194201 A CN201910194201 A CN 201910194201A CN 109869710 A CN109869710 A CN 109869710A
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- water
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- deoxygenation
- outlet
- heat exchanger
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- 238000006392 deoxygenation reaction Methods 0.000 title claims abstract description 68
- 238000010438 heat treatment Methods 0.000 title claims abstract description 37
- 239000002918 waste heat Substances 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 157
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000008400 supply water Substances 0.000 claims abstract description 24
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 18
- 239000001301 oxygen Substances 0.000 abstract description 18
- 229910052760 oxygen Inorganic materials 0.000 abstract description 18
- 230000007797 corrosion Effects 0.000 abstract description 8
- 238000005260 corrosion Methods 0.000 abstract description 8
- 238000010977 unit operation Methods 0.000 abstract description 4
- 239000003517 fume Substances 0.000 abstract description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 13
- 239000003546 flue gas Substances 0.000 description 13
- 239000002253 acid Substances 0.000 description 6
- 238000005273 aeration Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 238000009841 combustion method Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000008236 heating water Substances 0.000 description 2
- 230000003020 moisturizing effect Effects 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Landscapes
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The present invention relates to a kind of waste heat boiler tail portion deoxygenation heating systems.The present invention includes drum, the deoxygenation head being fixed at the top of drum, export the back-end surfaces connecting with deoxygenation head entrance, second feed pump, atmospheric type deaerator, water-water heat exchanger, first feed pump, back-end surfaces entrance is connected with the second water supply pump discharge, back-end surfaces outlet end is provided with deoxygenation heat supply water out and heat supply water out, water-water heat exchanger has the second feed-water intake being connected with the feedwater outlet of atmospheric type deaerator, the second feedwater outlet being connect with entrance of water-supplying pump, the first feed-water intake being connect with the first water supply pump discharge, the first feedwater outlet being connected with the feed-water intake of atmospheric type deaerator.The present invention solves high fume temperature of the existing technology, supplying hot water high oxygen content causes under corrosion and non-supplying thermal condition heating surface be in dry-fire condition to bring security risk to unit operation and lead to the technical problems such as unit output reduction.
Description
Technical field
The present invention relates to a kind of waste heat boiler tail portion deoxygenation heating systems, belong to station boiler equipment technical field.
Background technique
With the adjustment of national energy structure, more and more newly-built gas-steam combined cycle set is used " fixed with heat
The mode of electricity ", steam turbine use back pressure unit, and the steam discharge of steam turbine is completely used for industrial production or heat supply without recycling, because
This waste heat boiler needs a large amount of supplementary feeds in the process of running.The water supply of supplement is usually to pass through chemically treated demineralized water,
Since the oxygen content of demineralized water is much larger than water supply oxygen content national standard, (water supply oxygen content is less than 50ppb, and steam oxygen content is less than
7ppb), in order to solve the problems, such as the deoxygenation of water supply, existing solution is to add atmosphere in boiler tail deoxygenation heating system
Formula oxygen-eliminating device, as shown in Fig. 1: atmospheric type deaerator 5 be arranged between the first feed pump 6 and back-end surfaces 3, by tail portion by
It draws supplying hot water all the way and is sent into atmospheric type deaerator 5 as deoxygenation heat source in the hot outlet of face 3；In boiler operatiopn, the water supply of supplement
Water temperature after atmospheric type deaerator 5 carries out thermal de-aeration is sent by the first feed pump 6 and rises to 104 DEG C, and oxygen content is reduced to 50ppb
Continue to be heated to 130 DEG C or so hereinafter, being then sent into back-end surfaces 3 by the second feed pump 4, enters back into deoxygenation head 2
Secondary deoxygenation is carried out, oxygen content is reduced to 7ppb or less to enter drum 1 after secondary deoxygenation；In order to reduce exhaust gas temperature, pot
The supplying hot water heating surface 901 for absorbing flue gas heat is also set up in furnace back-end ductwork, individually connection is outer for supplying hot water heating surface 901
Portion water source is simultaneously provided out hot water.It can be seen that carrying out deoxygenation to moisturizing by setting atmospheric type deaerator 5, preferably solve
The deoxygenation problem of moisturizing, but above-mentioned waste heat boiler tail portion deoxygenation heating system is lacked there is also following in the process of running
Point:
1, due to water supply, water temperature has risen to 104 DEG C after atmospheric type deaerator 5 completes deoxygenation, thus is passing through back-end surfaces
When 3 and the heat exchange of flue gas is less, and especially under non-heating operating condition, since supplying hot water heating surface 901 does not work, the heat of flue gas is obtained
Less than fully absorbing, thus the exhaust gas temperature of boiler is higher, causes the efficiency of boiler operatiopn poor；
2, the independent connection external water source of supplying hot water heating surface 901, into supplying hot water heating surface 901 supplying hot water without deoxygenation, supply
Hot water heating surface 901 is easy to happen oxidation corrosion；
3, under non-supplying thermal condition, supplying hot water heating surface 901 is in dry-fire condition, brings security risk to unit operation, together
When increase combustion engine exhaust back pressure, reduce unit output.
Summary of the invention
The present invention mainly solve present in the prior art due to back-end surfaces with flue gas heat exchange is less leads to boiler
Operational energy efficiency decline, supplying hot water heating surface is easy to happen corrosion and dry combustion method brings the technological deficiency of unit safety hidden danger, provides one
Corrosion or dry combustion method occur kind back-end surfaces for abundant and avoidable heating surface so that it is guaranteed that unit operational safety can with flue gas heat exchange
It leans on, the higher waste heat boiler tail portion deoxygenation heating system of boiler operatiopn efficiency.
What the present invention was mainly addressed by following technical proposals in view of the above technical problems: the present invention includes vapour
Packet exports the deoxygenation head being connected with drum, exports the back-end surfaces connecting with deoxygenation head entrance, and the second feed pump has
Feed-water intake, feedwater outlet, deoxygenation heat supply water inlet atmospheric type deaerator, the first feed pump, back-end surfaces entrance and
Two water supply pump discharges are connected, and back-end surfaces outlet end is provided with deoxygenation heat supply water out, deoxygenation heat supply water out and deoxygenation
Heat supply water inlet is connected, it is characterised in that: further includes water-water heat exchanger, water-water heat exchanger has and the first water supply pump discharge
The first feed-water intake for being connected, the first feedwater outlet being connected with feed-water intake, be connected with feedwater outlet second to
Water inlet, connect the first feed-water intake and the first feedwater outlet at the second feedwater outlet being connected with the second entrance of water-supplying pump
Heat exchanger tube, back-end surfaces outlet end are provided with heat supply water out.
Preferably, further including the feed water by-pass being arranged in parallel with water-water heat exchanger, the entrance of feed water by-pass is given with first
Exit of pump is connected and exports and be connected with the feed-water intake of atmospheric type deaerator, is provided with by water supply on feed water by-pass
The second check-valve of second control valve of road arrival end and close feed water by-pass outlet end.
Preferably, the first control valve is provided at the first feed-water intake of water-water heat exchanger, the of water-water heat exchanger
First check-valve is provided at one feedwater outlet.
Therefore, structure of the invention is reasonable, has the advantage that
In the present invention, water-water heat exchanger is set in the outlet end of atmospheric type deaerator.In boiler operatiopn, by the first feed pump
The water supply (water supply at this time is room temperature and oxygen content is exceeded) of input enters water-water heat exchanger heat exchange by the first feed-water intake first
It heats up and is flowed out from the first feedwater outlet, then atmospheric type deaerator is entered by feed-water intake and carries out deoxygenation, the water supply after deoxygenation (contains
Oxygen amount is up to standard, 104 °C of water temperature or so) after feedwater outlet outflow by the second feed-water intake enter back into water-water heat exchanger and by
The room temperature water supply that first feed-water intake enters water-water heat exchanger exchanges heat, and water temperature drop is to 55 DEG C or so through second after heat exchange
Feedwater outlet outflow, then back-end surfaces are pumped by the second water supply, 130 DEG C are warming up in back-end surfaces and flue gas heat exchange
After be sent to drum.Since water temperature is highly improved after water-water heat exchanger heat exchange for room temperature water supply, water supply is in atmospheric type deaerator
The supplying hot water quantity expended needed for deoxygenation greatly reduces, thus the high temperature water-supply of back-end surfaces feeding drum just greatly increases,
The power output of drum is set to get a promotion；Simultaneously as the water supply after deoxygenation heating is given when passing through water-water heat exchanger with from first
The room temperature water supply of water pump exchanges heat and cools down, thus water temperature when water supply arrival back-end surfaces is lower, can carry out with flue gas abundant
Heat exchange, the heat of flue gas are fully used, and exhaust gas temperature declines to a great extent, and discharges fume in the case where unit is in heat supply or non-supplying thermal condition
Temperature can be reduced to 90 DEG C or less.Therefore, the present invention has the advantages that boiler output is higher, energy saving in running is efficient.
In the present invention, back-end surfaces are integral type heating surface, and water supply and supplying hot water share same heating surface, therefore into
It is up to standard by oxygen content after atmospheric type deaerator deoxygenation to enter the water supply of back-end surfaces, supplying hot water, so as to avoid tail portion by
There is oxidation corrosion in hot face；Since water supply and supplying hot water share same heating surface, thus back-end surfaces are in heat supply or non-heat supply
It is in working condition under operating condition, is in dry in non-supplying thermal condition due to supplying hot water heating surface in the prior art to solve
Burning state and bring security risk to unit operation, and cause combustion engine to be vented since supplying hot water heating surface is in dry-fire condition
The technical issues of back pressure increases, unit output reduces；In addition, the outlet end of back-end surfaces, heat supply is arranged in heat supply water out
The water temperature of water out is higher, heat capacity is stronger.
In a preferred embodiment of the invention, system is also provided with feed water by-pass, and the second control valve is arranged on feed water by-pass,
First control valve is set at the first feed-water intake of water-water heat exchanger.Room temperature water supply from the first feed pump can be by water supply by
Road is directly entered atmospheric type deaerator progress deoxygenation or enters back into atmospheric type deaerator after exchanging heat by water-water heat exchanger and removed
The running route of oxygen, water supply can be adjusted and be switched by the first control valve, the second control valve according to boiler operation situation.?
In unit running process, the first control valve is normally opened, and the second control valve is normally closed, and room temperature water supply is heated up laggard by water-water heat exchanger
Enter atmospheric type deaerator deoxygenation；When amount of sulfur contenting in smoke is larger, when flue gas acid dew point is higher, the first control valve is closed, opens second
Control valve, the water supply from the first feed pump are directly entered atmospheric type deaerator by feed water by-pass around water-water heat exchanger and remove
Oxygen, the water supply after deoxygenation heating cool down when by water-water heat exchanger due to not having to exchange heat, thus when entering back-end surfaces
(104 DEG C or so) of water supply water temperature are higher than acid dew point, avoid back-end surfaces in this way and acid dew piont corrosion occurs, to improve tail
The service life of portion's heating surface.
Therefore, the present invention solves the technical problems existing in the prior art, higher with boiler output and operational energy efficiency,
The advantages that safe and reliable to operation and long service life.
Detailed description of the invention
Attached drawing 1 is the schematic diagram of the prior art；
Attached drawing 2 is a kind of schematic diagram of preferred embodiment of the present invention
Description of symbols: 1. drums；2. deoxygenation head；3. back-end surfaces；31. heat supply water out；32. deoxygenation supplying hot water goes out
Mouthful；4. the second feed pump；5. atmospheric type deaerator；51. feed-water intake；52. feedwater outlet；53. deoxygenation heat supply water inlet；6. the
One feed pump；7. water-water heat exchanger；71. the second feed-water intake；72. the second feedwater outlet；73. the first feed-water intake；74. the
One feedwater outlet；75. the first control valve；76. first check-valve；77. heat exchanger tube；8. feed water by-pass；81. the second control valve；82.
Second check-valve.
Specific 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: such as attached drawing 2, shown, the present invention includes drum 1, exports the deoxygenation head 2 being connected with drum 1, is exported
The back-end surfaces 3 connecting with 2 entrance of deoxygenation head, the second feed pump 4 have feed-water intake 51, feedwater outlet 52, deoxygenation heat supply
The atmospheric type deaerator 5 of water inlet 53, the first feed pump 6,3 entrance of back-end surfaces are connected with the outlet of the second feed pump 4, tail
Heating surface 3 outlet end in portion's is provided with heat supply water out 31 and deoxygenation heat supply water out 32, and deoxygenation heat supply water out 32 and deoxygenation supply
Hot water inlet 53 is connected, and further includes water-water heat exchanger 7, and water-water heat exchanger 7 has second to be connected with feedwater outlet 52
Feed-water intake 71, the second feedwater outlet 72 for being connected with 4 entrance of the second feed pump are connected with the outlet of the first feed pump 6
First feed-water intake 73, the first feedwater outlet 74 being connected with feed-water intake 51, connect the first feed-water intake 73 and first to
The heat exchanger tube 77 of water out 74；
It further include the feed water by-pass 8 being arranged in parallel with water-water heat exchanger 7, the entrance of feed water by-pass 8 and the first feed pump 6 export
It is connected and exports and be connected with the feed-water intake 51 of atmospheric type deaerator 5, is provided on feed water by-pass 8 close to feed water by-pass 8
The second check-valve 82 of second control valve 81 of arrival end and close 8 outlet end of feed water by-pass.
The first control valve 75 is provided at first feed-water intake 73 of water-water heat exchanger 7, the first of water-water heat exchanger 7 is given
First check-valve 76 is provided at water out 74.
When unit is run, the first control valve 75 is normally opened, and the second control valve 81 is normally closed, and room temperature water supply passes through the first feed pump 6
Enter water-water heat exchanger 7 via the first control valve 75 and the first feed-water intake 73, exchange heat heating when flowing through heat exchanger tube 77, so
Water-water heat exchanger 7 is flowed out by the first feedwater outlet 74 and first check-valve 76 afterwards, then is removed by feed-water intake 51 into air suspended type
Oxygen device 5 carries out thermal de-aeration, passes through deoxygenation heat supply by the deoxygenation supplying hot water that the deoxygenation heat supply water out 32 of tail portion heating-surface 3 is drawn
Water inlet 53 enters atmospheric type deaerator 5 and is used as deoxygenation heat source；Water supply is gone out after 5 thermal de-aeration of atmospheric type deaerator by water supply
Water supply oxygen content is reduced to 50ppb or less, water temperature reaches 104 DEG C or so when mouth 52 flows out, and then passes through the second feed-water intake 71
It is again introduced into water-water heat exchanger 7 and carries out heat exchange with the room temperature water supply for flowing through heat exchanger tube 77, gone out after water supply heat exchange by the second water supply
Mouthfuls 72 water temperature drops when flowing out are to 55 DEG C or so, then are sent into back-end surfaces 3 and flue gas heat exchange by the second feed pump 4 and heat up
To 130 DEG C or so, subsequently into deoxygenation head 2, after the secondary deoxygenation of deoxygenation head 2 (water supply oxygen content is reduced to 7ppb or less)
Into drum 1；
When sulfur content is larger in flue gas, when flue gas acid dew point is higher, the first control valve 75 is closed, opens the second control valve 81, often
Warm water supply enters feed water by-pass 8 by the first feed pump 6, is entered after the second control valve 81 and second check-valve 82 by water supply
Mouthfuls 51 enter atmospheric type deaerators 5, the deoxygenation supplying hot water from deoxygenation heat supply water out 32 by deoxygenation heat supply water inlet 53 into
Enter atmospheric type deaerator 5 for thermal de-aeration；Water supply oxygen content after atmospheric type deaerator 5 carries out thermal de-aeration is reduced to
50ppb or less and water temperature reach 104 DEG C, by not carrying out heat exchange cooling when water-water heat exchanger 7 and by the second feed pump
4 are sent into back-end surfaces 3, are heated to 130 DEG C again through back-end surfaces 3, water supply enters deoxygenation head 2 and carries out secondary deoxygenation
(oxygen content is reduced to 7ppb or less) enters drum 1 afterwards.
In the process of running, heat exchange has been carried out in water-water heat exchanger 7 due to the room temperature water supply from the first feed pump 6
And heated up, so deoxygenation supplying hot water spent by water supply deoxygenation greatly reduces, back-end surfaces 3 are sent into drum 1
High temperature water-supply substantially increases, and therefore, the power output of drum 1 gets a promotion；Meanwhile the water supply after deoxygenation heating is in water-water heat exchanger 7
Heat exchange is carried out with room temperature water supply, the water supply water temperature after heat exchange cooling is lower (55 DEG C or so), by giving when back-end surfaces 3
The heat exchange of water and flue gas is more abundant, so that exhaust gas temperature can be reduced within 90 DEG C, thus improves the operation of waste heat boiler
Efficiency；Back-end surfaces 3 are integral type heating surface, and water supply and supplying hot water share back-end surfaces 3, thus back-end surfaces 3 exist
Be in working condition under heat supply and non-supplying thermal condition, thus solve occur under the non-supplying thermal condition of unit heating surface dry combustion method to
Unit operation brings security risk and combustion engine exhaust back pressure to increase the technical issues of causing unit output to reduce.
In the case where the first control valve 75 is closed, the second control valve 81 is opened, room temperature water supply bypasses water-water heat exchanger 7
It is directly entered atmospheric type deaerator 5, after being heated up by 5 deoxygenation of atmospheric type deaerator, is not had when again passing by water-water heat exchanger 7
There is heat exchange to cool down, therefore water supply is higher than acid dew point for (104 DEG C) of water temperature when entering back-end surfaces 3, can avoid back-end surfaces 3
Acid dew piont corrosion occurs, to improve the service life of back-end surfaces 3.
For the present invention when unit is in supplying thermal condition, back-end surfaces 3 are for heating water supply and supplying hot water, due to supplying hot water
31 setting of outlet is exported in back-end surfaces 3, the high temperature section in heating surface, thus the water temperature of supplying hot water is higher, heat capacity
It is relatively strong；Meanwhile supplying hot water have passed through 5 deoxygenation of atmospheric type deaerator, solve in the prior art since supplying hot water oxygen content is high
The problem of causing supplying hot water heating surface to be easy to happen oxidation corrosion.
For the present invention when unit is in pure condensate operating condition, back-end surfaces 3 are completely used for heating water supply, improve into drum
1 feed temperature improves the evaporation capacity of boiler, increases the power output of unit.
For the present invention when unit is in pure condensate or supplying thermal condition, back-end surfaces 3 are in running order always, avoid by
Hot face is in the generation of dry-fire condition, it is ensured that the safe operation of unit.
Certainly, above-mentioned drawings and examples only for for explanation and illustration the present invention, can not as it is of the invention not
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 variation
Enter protection scope of the present invention.
Claims (3)
1. a kind of waste heat boiler tail portion deoxygenation heating system, including drum (1) export the deoxygenation being connected with the drum (1)
Head (2), exports the back-end surfaces (3) connecting with deoxygenation head (2) entrance, and the second feed pump (4) has feed-water intake
(51), the atmospheric type deaerator (5) of feedwater outlet (52), deoxygenation heat supply water inlet (53), the first feed pump (6), the tail portion
Heating surface (3) entrance is connected with second feed pump (4) outlet, and back-end surfaces (3) outlet end is provided with deoxygenation
Heat supply water out (32), the deoxygenation heat supply water out (32) are connected with the deoxygenation heat supply water inlet (53), and feature exists
In: it further include water-water heat exchanger (7), the water-water heat exchanger (7) has to be connected with first feed pump (6) outlet
First feed-water intake (73), the first feedwater outlet (74) being connected with the feed-water intake (51) and the feedwater outlet
(52) the second feed-water intake (71) for being connected, the second feedwater outlet (72) being connected with the second feed pump (4) entrance,
Connect the heat exchanger tube (77) of first feed-water intake 73 and first feedwater outlet 74, back-end surfaces (3) outlet
End is provided with heat supply water out (31).
2. a kind of waste heat boiler tail portion deoxygenation heating system according to claim 1, it is characterised in that: further include with it is described
The feed water by-pass (8) that water-water heat exchanger (7) is arranged in parallel, the entrance of the feed water by-pass (8) and first feed pump (6)
Outlet is connected and exports and be connected with the feed-water intake (51) of the atmospheric type deaerator (5), the feed water by-pass (8)
On be provided with close to second control valve (81) of the feed water by-pass (8) arrival end and close to the feed water by-pass (8) outlet end
Second check-valve (82).
3. a kind of waste heat boiler tail portion deoxygenation heating system according to claim 1 or 2, it is characterised in that: the water-water
It is provided with the first control valve (75) at first feed-water intake (73) of heat exchanger (7), the institute of the water-water heat exchanger (7)
It states and is provided with first check-valve (76) at the first feedwater outlet (74).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910194201.2A CN109869710A (en) | 2019-03-14 | 2019-03-14 | Waste heat boiler tail portion deoxygenation heating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910194201.2A CN109869710A (en) | 2019-03-14 | 2019-03-14 | Waste heat boiler tail portion deoxygenation heating system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109869710A true CN109869710A (en) | 2019-06-11 |
Family
ID=66920483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910194201.2A Pending CN109869710A (en) | 2019-03-14 | 2019-03-14 | Waste heat boiler tail portion deoxygenation heating system |
Country Status (1)
| Country | Link |
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| CN (1) | CN109869710A (en) |
Cited By (2)
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| 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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| 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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