CN107990301B - Water supply and oxygen removal system of waste heat boiler - Google Patents
Water supply and oxygen removal system of waste heat boiler Download PDFInfo
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- CN107990301B CN107990301B CN201711467463.9A CN201711467463A CN107990301B CN 107990301 B CN107990301 B CN 107990301B CN 201711467463 A CN201711467463 A CN 201711467463A CN 107990301 B CN107990301 B CN 107990301B
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- deaerator
- heating surface
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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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Abstract
The invention relates to a water supply and oxygen removal system of a waste heat boiler. The device comprises a low-pressure steam drum, a tail heating surface, a first water feed pump, a second water feed pump, a first deaerator adopting a vacuum type deaerator and a second deaerator connected with the low-pressure steam drum, wherein the second deaerator adopts integrated thermal deaerator and is connected with the tail heating surface, the tail heating surface is an integrated heating surface and is provided with a heat supply outlet and a vacuum deaerator heating water outlet, the vacuum deaerator heating water outlet and the first water feed pump are connected with the first deaerator, the first deaerator is connected with the second water feed pump, and the second water feed pump is connected with the tail heating surface. The invention adopts the combination of vacuum type deoxidization and integrated thermal deoxidization and the integral arrangement of the tail heating surface, thereby solving the technical problems of low boiler output, higher exhaust gas temperature, easy corrosion of the tail heating surface, dry burning of the heating surface under the working condition of non-heat supply and the like in the prior art.
Description
Technical Field
The invention relates to a water supply and oxygen removal system of a waste heat boiler, belonging to the technical field of power station boiler equipment.
Background
With the changing heat supply demand of power plants, especially the increasing demand for steam heat supply and the increasing distance of heat supply, the exhaust steam of the steam turbine is used for heat supply and is not recycled in more and more projects, which causes the combustion engine to need to supplement a large amount of water supply in the operation process. Because the supplemented feed water is desalted water with high oxygen content, under the condition of full-capacity supplemented desalted water, the oxygen content of the feed water exceeds 5000ppb and is far greater than the national standard that the oxygen content of the feed water must be less than 50ppb, and obviously, the integrated thermal deaerator positioned at the upper end of the low-pressure steam drum cannot directly reduce the oxygen content of the feed water exceeding 5000ppb to be less than 7ppb, so that the oxygen content of steam generated by the low-pressure steam drum cannot reach the national standard (GB 12145-1999 requirements of steam quality standards of thermal generator sets and steam power equipment, namely, the oxygen content of the steam is less than 7ppb and the oxygen content of the feed water of a boiler is less than 50 ppb). In order to solve the deoxygenation problem of the feed water, the existing solution is as follows: an outlet end of the first water supply pump 3 is provided with an atmospheric thermal deaerator 90, one path of steam led out from the low-pressure steam drum 1 is used as a heat source for the atmospheric deaerator 90 to heat the feed water (the oxygen content exceeds 5000 ppb) at about 20 ℃ from the first water supply pump to 104 ℃ for thermal deaerating, the oxygen content of the feed water is reduced to reach the national standard, an independent hot water supply heating surface 81 is additionally arranged on the tail heating surface of the boiler except for the feed water heating surface 80 for reducing the tail smoke temperature, and the feed water after being deaerated by the atmospheric thermal deaerator 90 and reaching the standard is sent to the feed water heating surface 80 by the second water supply pump 4 to be heated and then enters the low-pressure steam drum 1 (as shown in attached figure 1). Although the technical scheme of the oxygen removal by atmospheric thermal power solves the problem of water supply oxygen removal under the condition of full-capacity supplement of demineralized water, the following defects exist in the operation process:
the atmospheric thermal deoxygenation needs to be carried out by extracting saturated steam from the low-pressure steam drum 1 to the atmospheric thermal deoxygenator 90 to be used as a heat source for deoxygenation, and the consumption of the saturated steam causes the reduction of the output of the boiler;
because the water temperature of the feed water is heated to 104 ℃ during deoxygenation, the heat exchange between the feed water heating surface 80 and the flue gas is less, the temperature of the flue gas is increased, and the running efficiency of the combustion engine is reduced;
the independently arranged hot water supply heating surface 81 has low heat supply capacity, and the hot water in the hot water supply heating surface 81 has high oxygen content because oxygen is not removed, so that the hot water supply heating surface 81 is easy to oxidize and corrode; the hot water supply heating surface 81 is in a dry-burning state under the working condition of non-heat supply, thereby improving the exhaust back pressure of the gas turbine and reducing the output of the unit while bringing potential safety hazards to the unit operation.
Disclosure of Invention
The invention mainly solves the technical problems of low boiler output, high exhaust gas temperature, easy corrosion of a hot water supply heating surface and potential safety hazard brought to unit operation by dry burning in the prior art, and provides the waste heat boiler water supply deoxygenation system which has high boiler output, low exhaust gas temperature, difficult corrosion of the hot water supply heating surface and no dry burning phenomenon, thereby ensuring safer and more efficient unit operation.
The invention mainly solves the technical problems through the following technical scheme: the invention comprises a low-pressure steam pocket, a tail heating surface provided with at least one heat supply outlet, a first water supply pump with an inlet connected with external water supply, a first deaerator with an inlet connected with an outlet of the first water supply pump, and a second water supply pump with an inlet connected with an outlet of the first deaerator, and is characterized in that: the first deaerator is a vacuum deaerator, and the first deaerator further comprises a second deaerator of which the outlet is connected with the low-pressure steam drum, the inlet of the second deaerator is connected with the outlet of the tail heating surface, the tail heating surface is an integral heating surface and is provided with a vacuum deaerating and heating water outlet, the vacuum deaerating and heating water outlet is connected with the inlet of the first deaerator, the outlet of the second water supply pump is connected with the inlet of the tail heating surface, and the second deaerator is an integrated thermal deaerator.
Preferably, the first deaerator comprises a water supply heating pipe, one end of the water supply heating pipe is connected with an outlet of the first water supply pump and an outlet of the vacuum deaerating heating water, and the other end of the water supply heating pipe is connected with an inlet of the first deaerator.
Preferably, the hot water supply outlet is arranged on the tail heating surface according to a set temperature.
Therefore, the invention is simple and reasonable, and has the following advantages:
the invention is characterized in that a first deaerator is arranged at the outlet end of a first water supply pump, the first deaerator adopts a vacuum deaerator, a second deaerator is arranged at the upper part of a low-pressure steam pocket, the second deaerator adopts an integrated thermal deaerator, feed water with extremely high oxygen content enters the first deaerator through the first water supply pump for vacuum deaerating, the feed water is conveyed to a tail heating surface through the second feed water pump after the oxygen content of the feed water is reduced to be below 50ppb, the feed water enters the second deaerator for thermal deaerating after being heated and heated by the tail heating surface, and the feed water enters the low-pressure steam pocket after being deaerated by the second deaerator and reaching the oxygen content of below 7 ppb. The water supply temperature required by the first deaerator during deaerating is only about 45 ℃, so that the water supply from the first water supply pump can be heated to about 45 ℃ only by extracting partial hot water from a vacuum deaerating hot water outlet of the tail heating surface as a heat source, and the water supply after vacuum deaerating is heated and heated by the tail heating surface and then enters the second deaerator for thermal deaerating, so that the oxygen content of the water supply can be reduced to below 7ppb only by using a small amount of steam. Therefore, when the water supply and the oxygen removal are carried out, a large amount of saturated steam in the low-pressure steam pocket does not need to be consumed as a heat source, and the high output of the boiler is ensured.
The tail heating surface of the invention adopts an integral heating surface, and as the tail heating surface is shared by hot water supply and water supply, the tail heating surface can be preferably provided with a plurality of hot water outlets with different set temperatures for supplying heat, thereby realizing diversification of heat supply parameters and simultaneously supplying hot water for multi-parameter users; meanwhile, the oxygen content of feed water entering the tail heating surface is reduced to be below 50ppb after the feed water is deoxidized by the first deaerator, so that the technical problems that the tail heating surface is seriously corroded to cause potential safety hazards to unit operation and the like due to extremely high oxygen content of hot water in the prior art are solved; when the unit is in a non-heat supply working condition, the tail heating surface can be used for heating water supply, so that the problems that in the prior art, the back pressure of a combustion engine is increased, the power generation power of a gas turbine of a power plant is reduced and the like caused by the fact that the hot water supply heating surface does not work and is arranged in a flue for dry burning, smoke resistance is increased are solved.
In the invention, the temperature of feed water entering the tail heating surface after being deoxidized by the first deaerator is about 45 ℃, the tail heating surface can fully exchange heat with flue gas, and the temperature of exhaust gas can be reduced to below 90 ℃ under the working conditions of heat supply or non-heat supply, so that the boiler output and the operation efficiency are greatly improved compared with the prior art.
Drawings
FIG. 1 is a schematic diagram of a prior art system;
FIG. 2 is a system diagram of the preferred embodiment of the present invention;
FIG. 3 is a schematic flow diagram of water supply during vacuum type oxygen removal in the preferred embodiment of the present invention shown in FIG. 2.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example 1: as shown in attached figures 2 and 3, the low-pressure steam drum comprises a low-pressure steam drum 1, a tail heating surface 2, a first water feeding pump 3 with an inlet connected with external water feeding, a second water feeding pump 4, a first deaerator 5, and a second deaerator 6 with an outlet connected with the low-pressure steam drum 1, wherein the first deaerator 5 adopts a vacuum deaerator, and the second deaerator 6 adopts an integrated thermal deaerator;
the tail heating surface 2 is an integral heating surface, an outlet of the tail heating surface is connected with an inlet of a second deaerator 6, the tail heating surface 2 is provided with a heat supply outlet 21 and a vacuum deaerating heating water outlet 22, the heat supply outlet 21 is arranged at each water temperature section of the tail heating surface 2 according to the set heat supply water temperature, and the inlet of the tail heating surface 2 is connected with an outlet of a second water feed pump 4;
the first deaerator 5 is provided with a water supply heating pipe 51, an inlet of the water supply heating pipe 51 is connected with an outlet of the first water supply pump 3 and the deaerating heat supply port 22, an outlet of the water supply heating pipe 51 is connected with an inlet of the first deaerator 5, and an outlet of the first deaerator 5 is connected with an inlet of the second water supply pump 4.
When the unit is operated, desalted water with high oxygen content enters a first deaerator 5 for vacuum deoxidization after being mixed with hot water from a vacuum deoxidization heating water outlet 22 through a water supply heating pipe 51 by a first water supply pump 3 and heated, the oxygen content is reduced to below 50ppb and then enters a tail heating surface 2 through a second water supply pump 4, the desalted water enters a second deaerator 6 for thermal deoxidization after being heated and heated by the tail heating surface 2, the oxygen content is reduced to 7ppb and then enters a low-pressure steam drum 1, and the deoxidization working flow of boiler water supply is completed. Because the vacuum deaerator is adopted, the water supply for deaerating only needs to be heated to about 45 ℃, partial hot water is extracted from the tail heating surface 2 to be used as a deaerating heat source, the water temperature requirement of the vacuum deaerator can be met, and steam is not required to be extracted from the low-pressure steam pocket 1 to be used as the deaerating heat source, so the output of the low-pressure steam pocket 1 is greatly improved; meanwhile, the tail heating surface 2 is an integral heating surface, the tail heating surface 2 is shared by hot water and water supply, the tail heating surface 2 fully exchanges heat with flue gas, and the temperature of the flue gas can be reduced to be within 90 ℃, so that compared with an atmospheric deoxygenation scheme in the prior art, the method can improve the operation efficiency of the waste heat boiler by more than 4%;
when the unit is in a heat supply working condition, the heat supply outlet 21 distributed on the tail heating surface 2 can be selected as a water intake according to the requirement, and the heat supply outlet 21 can meet the heat supply requirement of 60-175 ℃. Therefore, the problems of single heat supply parameter, low capacity and serious oxidation corrosion of the hot water supply heating surface caused by high oxygen content of the hot water in the prior art due to independent arrangement of the hot water supply heating surface are solved.
When the unit is in a non-heat supply working condition, the tail heating surface 2 is used for heating water to the low-pressure steam drum 1, so that the evaporation capacity of the boiler is improved, the integral power generation power of a power plant is increased, and the problems that in the prior art, the tail independently arranged hot water supply heating surface does not work, the heating surface is completely arranged in a flue to be dried and burnt to influence the safety of the heating surface, the back pressure of a gas turbine is increased due to the fact that the dried heating surface increases smoke resistance in the flue, the power generation power of a gas turbine of the power plant is reduced and the like are solved.
Of course, the drawings and examples described above are only for the purpose of illustrating and explaining the present invention and are not to be construed as unduly limiting the invention. The technical solutions of the present invention obtained by equivalent or equivalent adjustments and changes by those skilled in the art are all within the protection scope of the present invention.
Claims (3)
1. The utility model provides a waste heat boiler feedwater deoxidization system, includes low pressure steam pocket (1), is equipped with afterbody heating surface (2) of at least one heat supply export (21), and the entry is connected with outside feedwater first feed water pump (3), the entry with first oxygen-eliminating device (5) that first feed water pump (3) export is connected, the entry with second feed water pump (4) that first oxygen-eliminating device (5) export is connected, its characterized in that: first oxygen-eliminating device (5) adopt vacuum type oxygen-eliminating device, still including the export with second oxygen-eliminating device (6) that low pressure steam pocket (1) is connected, second oxygen-eliminating device (6) entry with the afterbody is heated the face (2) and is exported and be connected, afterbody is heated face (2) and is equipped with vacuum oxygen-eliminating and adds hot water outlet (22) for integral heating face, vacuum oxygen-eliminating add hot water outlet (22) with first oxygen-eliminating device (5) entry is connected, second feed water pump (4) export with afterbody is heated face (2) entry and is connected, second oxygen-eliminating device (6) adopt integral type heating power oxygen-eliminating device.
2. The waste heat boiler water feeding and oxygen removing system according to claim 1, characterized in that: the first deaerator (5) comprises a water supply heating pipe (51), one end of the water supply heating pipe (51) is connected with the outlet of the first water supply pump (3) and the vacuum deaerating heating water outlet (22), and the other end of the water supply heating pipe is connected with the inlet of the first deaerator (5).
3. The waste heat boiler water feeding and oxygen removing system according to claim 1 or 2, characterized in that: the heat supply outlet (21) is arranged on the tail heating surface (2) according to a set temperature.
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 |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711467463.9A CN107990301B (en) | 2017-12-28 | 2017-12-28 | Water supply and oxygen removal system of waste heat boiler |
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| Publication Number | Publication Date |
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| CN107990301A CN107990301A (en) | 2018-05-04 |
| CN107990301B true CN107990301B (en) | 2022-12-02 |
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| CN201711467463.9A Active CN107990301B (en) | 2017-12-28 | 2017-12-28 | Water supply and oxygen removal system of waste heat boiler |
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Families Citing this family (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 |
Citations (5)
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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 |
-
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 |
| 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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