CN111780081A - 700 ℃ boiler heating surface arrangement device for preventing reheated steam temperature from failing to reach standard - Google Patents
700 ℃ boiler heating surface arrangement device for preventing reheated steam temperature from failing to reach standard Download PDFInfo
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- CN111780081A CN111780081A CN202010792570.4A CN202010792570A CN111780081A CN 111780081 A CN111780081 A CN 111780081A CN 202010792570 A CN202010792570 A CN 202010792570A CN 111780081 A CN111780081 A CN 111780081A
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- water
- temperature
- heating surface
- reheated
- wall
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B21/00—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically
- F22B21/02—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from substantially straight water tubes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/08—Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
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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
- F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G7/00—Steam superheaters characterised by location, arrangement, or disposition
- F22G7/12—Steam superheaters characterised by location, arrangement, or disposition in flues
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Abstract
The invention discloses a 700 ℃ boiler heating surface arrangement device for preventing the reheated steam temperature from not reaching the standard, which comprises an economizer, a water wall inlet, a water wall outlet, a low-temperature superheater, a platen superheater, a high-temperature superheater, a reheated water wall inlet, a reheated water wall outlet, a low-temperature reheater, a high-temperature reheater, a combustor, a hearth, a horizontal flue, a turning smoke chamber, a double flue and a tail flue. Starting from the characteristic of variation of the heat absorption ratio of main steam and reheat steam of the ultra-supercritical boiler at 700 ℃, according to the arrangement principle of a radiation heating surface and a convection heating surface of the boiler, the radiation heating surface of a hearth is divided into two parts, one part is provided with a water-cooled wall, the other part is provided with a reheat water-cooled wall, the areas of the water-cooled wall and the reheat water-cooled wall are reasonably designed according to the influence of the heat absorption ratio on the radiation heating surface, and the problem that the heat absorption ratio of the main steam and the reheat steam is changed when the ultra-supercritical boiler parameters are increased to 700 ℃ is fundamentally solved.
Description
Technical Field
The invention relates to the technical field of efficient power generation, in particular to a 700-DEG C boiler heating surface arrangement device for preventing the temperature of reheated steam from failing to reach the standard.
Background
In recent years, environmental problems such as domestic haze and the like are increasingly highlighted, and together with the responsibility of international society on carbon emission in China, the government in China is promoted to control the total consumption of coal and optimize the use mode of coal. About half of coal consumed in China every year is used for combustion power generation. For power generation enterprises, the same amount of electric power can be produced under the conditions of low coal consumption and low pollutant emission only by improving the system circulation efficiency. Increasing steam parameters is one of the most effective ways to achieve an increase in system cycle efficiency.
In pursuit of higher efficiency, research on ultra supercritical 700 ℃ power generation technology has been carried out successively in the united states, japan, and europe from the 80's of the last century, with emphasis on development of high-temperature components. From the end of the last 90 s of the century, 700 ℃ ultra supercritical power generation technology research programs such as European AD-700 and subsequent series programs, American USC program, Japanese A-USC program, India 700 ℃ technology development program, and the like, were successively started in countries and regions such as Europe, Japan, USA, India, and the like. The research of 700 ℃ power generation technology in China follows the world pace. In 2015, domestic backbone power generation enterprises start research and development and engineering feasibility research of a 650 ℃ generator set based on the stage achievement of '700 ℃ plan'. The local power group also started "251 demonstration project" which was designed to reduce the power coal consumption to 251 g/kWh.
At present, the steam parameter of the most advanced power generating set in the world exceeds 600 ℃, the pressure exceeds 30MPa, and the generating efficiency can reach 48 percent. When the steam temperature is increased to 700 ℃, the pressure reaches about 38MPa, and the generating efficiency of the system exceeds 50 percent. The improvement of the parameters has obvious influence on the heat absorption proportion of each heating surface of the boiler. Taking a 600MW single-reheat unit as an example, when the parameter is that the steam parameter is 26MPa/600 ℃/600 ℃, the heat absorption ratio of main steam is about 83%, and the heat absorption ratio of reheat steam is about 17%. When the steam parameter is increased to 35MPa/700 ℃/720 ℃, the heat absorption proportion of the main steam is reduced to about 78 percent, and the heat absorption proportion of the reheat steam is increased to about 22 percent. Due to the change of the heat absorption proportion, if the heating surface of the 700 ℃ grade boiler is arranged according to a conventional method, the problems of overlarge water-cooled wall area and insufficient heat exchange area of a reheater can be caused, and further overtemperature of main steam is caused, and the temperature of reheated steam does not reach the standard.
However, as can be seen from published literature data, although some studies have been made to solve the problem of the change of the arrangement of the heating surfaces caused by the heat absorption ratio of the 700 ℃ ultra-supercritical boiler, most of the solutions rely on simply adding a wall-type reheater or increasing the number of stages of reheaters to improve, and have the disadvantages of complex structure, large heat exchange area and limited effect.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a 700 ℃ boiler heating surface arrangement device for preventing the temperature of reheated steam from failing to reach the standard, which starts from the characteristic of variation of the heat absorption ratio of main steam and reheated steam of a 700 ℃ ultra-supercritical boiler, divides a hearth radiation heating surface into two parts according to the arrangement principle of a boiler radiation heating surface and a convection heating surface, wherein one part is provided with a water-cooled wall, the other part is provided with a reheated water-cooled wall, and the areas of the water-cooled wall and the reheated water-cooled wall are reasonably designed according to the influence of the heat absorption ratio on the radiation heating surface, so that the problem of variation of the heat absorption ratio of the main steam and the reheated steam when the parameter of the ultra-supercritical boiler is increased to 700.
In order to achieve the purpose, the invention adopts the technical scheme that:
a700 ℃ boiler heating surface arrangement device for preventing the reheated steam temperature from failing to reach the standard comprises a hearth 14, wherein the lower half part of the hearth 14 is provided with a water-cooled wall 3, and the upper half part of the hearth 14 is provided with a reheated water-cooled wall 9;
the water cooled wall 3 is used for receiving water from the high-pressure heater to generate main steam with the temperature and pressure reaching standards;
the reheating water-cooled wall 9 is used for receiving the exhaust gas from the turbine high-pressure cylinder to generate reheating steam with the temperature and pressure reaching the standard;
the hearth 14 is provided with a burner 13, and flue gas generated by the burner 13 passes through a flue gas channel to exchange heat with each heating surface arranged in the flue gas channel.
The water wall 3 and the reheating water wall 9 are both of membrane wall structures and both adopt an arrangement form of a rising vertical tube ring.
The bottom of the water-cooled wall 3 is provided with a water-cooled wall inlet 2, and the water-cooled wall inlet 2 is sequentially communicated with the water-cooled wall 3 and a water-cooled wall outlet 4; the water wall outlet 4, the low-temperature superheater 5, the platen superheater 6 and the high-temperature superheater 7 are communicated in sequence to form a main steam loop.
The reheating water wall 9 is provided with a reheating water wall inlet 8, and the reheating water wall inlet 8 is sequentially communicated with the reheating water wall 9, a reheating water wall outlet 10, a low-temperature reheater 11 and a high-temperature reheater 12 to form a reheating steam loop.
The combustor 13 is used for feeding fuel into the hearth 14 for combustion, and a flue gas output end of the hearth 14 is sequentially connected with a horizontal flue 15, a turning flue chamber 16, a double flue 17 and a tail flue 18 to form a flue gas channel. The platen superheater 6 is arranged at the upper part of the hearth 14, the high-temperature superheater 7 is arranged at the position of the hearth 14 close to the outlet smoke window 15, and the high-temperature reheater 12 is arranged in the horizontal flue; the low-temperature reheater 11 and the low-temperature superheater 5 are respectively arranged in two flues of the double flues 17; the economizer 1 is arranged in the back pass 18. The water-cooled wall 3 and the reheating water-cooled wall 9 are connected through an expansion joint.
The invention has the beneficial effects that:
in the specific operation, starting from the characteristic of the variation of the heat absorption ratio of main steam and reheat steam of the ultra-supercritical boiler at 700 ℃, according to the arrangement principle of the radiation heating surface and the convection heating surface of the boiler, the radiation heating surface of a hearth is innovatively divided into two parts, one part is provided with a water-cooled wall, the other part is provided with a reheat water-cooled wall, the areas of the water-cooled wall and the reheat water-cooled wall are reasonably designed according to the influence of the heat absorption ratio on the radiation heating surface, and the problem of the variation of the heat absorption ratio of the main steam and the reheat steam when the parameter of the ultra-supercritical boiler is increased to 700 ℃ is fundamentally solved.
Drawings
FIG. 1 is an overall system diagram of the present invention.
Wherein, 1 is the economizer, 2 is the water-cooling wall entry, 3 is the water-cooling wall, 4 is the water-cooling wall export, 5 is the low temperature superheater, 6 is the platen superheater, 7 is the high temperature superheater, 8 is reheat water-cooling wall entry, 9 is reheat water-cooling wall, 10 is reheat water-cooling wall export, 11 is the low temperature reheater, 12 is the high temperature reheater, 13 is the combustor, 14 is furnace, 15 is horizontal flue, 16 is the turn to smoke chamber, 17 is double flue, 18 is the afterbody flue.
Detailed Description
The present invention will be described in further detail with reference to examples.
As shown in figure 1, the 700 ℃ boiler heating surface arrangement device for preventing the reheated steam temperature from failing to reach the standard comprises an economizer 1, a water wall inlet 2, a water wall 3, a water wall outlet 4, a low-temperature superheater 5, a platen superheater 6, a high-temperature superheater 7, a reheated water wall inlet 8, a reheated water wall 9, a reheated water wall outlet 10, a low-temperature reheater 11, a high-temperature reheater 12, a burner 13, a furnace chamber 14, a horizontal flue 15, a turning flue chamber 16, a double flue 17 and a tail flue 18.
The lower half part of the hearth 14 is provided with a water-cooled wall 3, the upper half part of the hearth is provided with a reheating water-cooled wall 9, and the water-cooled wall 3 and the reheating water-cooled wall 9 are both of membrane wall structures and adopt the arrangement form of a rising vertical tube ring.
The water-cooled wall inlet 2 is communicated with a water-cooled wall 3 and a water-cooled wall outlet 4 in sequence; the water wall outlet 4, the low temperature superheater 5, the platen superheater 6 and the high temperature superheater 7 are communicated in sequence. The above components constitute a main steam circuit.
The inlet 8 of the reheating water wall, the reheating water wall 9, the outlet 10 of the reheating water wall, the low-temperature reheater 11 and the high-temperature reheater 12 are communicated in sequence to form a reheating steam loop.
The hearth 14, the horizontal flue 15, the turning flue 16, the double flue 17 and the tail flue 18 are communicated in sequence to form a flue gas channel.
The water wall 3 and the reheating water wall 9 are connected through an expansion joint.
The invention starts from the characteristic of variation of the heat absorption ratio of main steam and reheat steam, innovatively divides the radiation heating surface of the hearth into two parts according to the arrangement principle of the radiation heating surface and the convection heating surface of the boiler, one part is provided with a water-cooled wall, the other part is provided with a reheat water-cooled wall, and the areas of the water-cooled wall and the reheat water-cooled wall are reasonably designed according to the influence of the heat absorption ratio on the radiation heating surface, thereby fundamentally solving the problem of variation of the heat absorption ratio of the main steam and the reheat steam when the ultra-supercritical boiler parameter is increased to 700 ℃.
The specific working process of the invention is as follows:
the radiant heating surface of the boiler furnace 14 is divided into two parts, wherein one part is a water-cooled wall 3 and is arranged in the middle and the lower part of the furnace 14, and the other part is a reheating water-cooled wall 9 and is arranged at the upper part of the furnace 14; the water wall 3 and the reheating water wall 9 both adopt membrane walls and are connected through expansion joints.
The fuel is fed into a hearth 14 through a burner 13 for combustion, and the generated flue gas flows through a horizontal flue 15, a turning flue chamber 16, a double flue 17 and a tail flue 18 in sequence to exchange heat with all heating surfaces arranged in the flues.
Water from the high-pressure heater is sent into an economizer 1 to be heated, then flows through a water wall inlet 2, a water wall 3, a water wall outlet 4, a low-temperature superheater 5, a platen superheater 6 and a high-temperature superheater 7 in sequence, and finally generates main steam with the temperature and pressure reaching the standard.
Exhaust gas from the turbine high-pressure cylinder is sent to a reheating water wall inlet 8, a reheating water wall 9, a reheating water wall outlet 10, a low-temperature reheater 11 and a high-temperature reheater 12 in sequence, and finally reheated steam with the temperature and pressure reaching the standard is generated.
When the specific operation is adopted, starting from the characteristic of variation of the heat absorption ratio of main steam and reheat steam of the ultra-supercritical boiler at 700 ℃, according to the arrangement principle of the radiation heating surface and the convection heating surface of the boiler, the radiation heating surface of the hearth is innovatively divided into two parts, one part is provided with the water-cooled wall 3, the other part is provided with the reheat water-cooled wall 9, the areas of the water-cooled wall 3 and the reheat water-cooled wall 9 are reasonably designed according to the influence of the heat absorption ratio on the radiation heating surface, and the problem that the heat absorption ratio of the main steam and the reheat steam varies when the parameter of the ultra-supercritical boiler is increased to 700 ℃ is fundamentally solved.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A700 ℃ boiler heating surface arrangement device for preventing the reheated steam temperature from failing to reach the standard is characterized by comprising a hearth (14), wherein a water-cooled wall (3) is arranged at the lower half part of the hearth (14), and a reheated water-cooled wall (9) is arranged at the upper half part of the hearth;
the water cooled wall (3) is used for receiving water from the high-pressure heater to generate main steam with the temperature and pressure reaching standards;
the reheating water-cooled wall (9) is used for receiving the exhaust gas from the turbine high-pressure cylinder to generate reheating steam with the temperature and pressure reaching the standard;
the hearth (14) is provided with a burner (13), and flue gas generated by the burner (13) passes through a flue gas channel to exchange heat with each heating surface arranged in the flue gas channel.
2. The 700 ℃ boiler heating surface arrangement device for preventing the reheated steam temperature from reaching the unqualified temperature according to claim 1, wherein the water wall (3) and the reheated water wall (9) are both in a membrane wall structure and both adopt an arrangement form of an ascending vertical tube coil.
3. The 700 ℃ boiler heating surface arrangement device for preventing the reheated steam temperature from reaching the unqualified temperature according to claim 1, wherein the bottom of the water wall (3) is provided with a water wall inlet (2), and the water wall inlet (2) is communicated with the water wall (3) and the water wall outlet (4) in sequence; the water wall outlet (4), the low-temperature superheater (5) and the platen superheater (6) are communicated in sequence, and the high-temperature superheater (7) is communicated in sequence to form a main steam loop.
4. The arrangement device for the heating surface of the boiler at 700 ℃ for preventing the temperature of the reheated steam from being substandard according to claim 3, characterized in that the platen superheater (6) is arranged at the upper part of the furnace (14), and the high temperature superheater (7) is arranged at the position of the furnace (14) close to the outlet smoke window (15).
5. The 700 ℃ boiler heating surface arrangement device for preventing the reheated steam temperature from reaching the standard according to claim 1, wherein a reheated water wall inlet (8) is arranged on the reheated water wall (9), and the reheated water wall inlet (8) is sequentially communicated with the reheated water wall (9), the reheated water wall outlet (10), the low temperature reheater (11) and the high temperature reheater (12) to form a reheated steam circuit.
6. The arrangement device for the heating surface of the boiler at 700 ℃ for preventing the temperature of the reheated steam from being substandard according to claim 5, wherein the high temperature reheater (12) is arranged in a horizontal flue; the low-temperature reheater (11) and the low-temperature superheater (5) are respectively arranged in two flues of the double flues (17); the economizer (1) is arranged in the tail flue (18).
7. The 700 ℃ boiler heating surface arrangement device for preventing the reheated steam temperature from reaching the unqualified temperature according to claim 1, wherein the burner (13) is used for feeding fuel into the hearth (14) for combustion, and a flue gas output end of the hearth (14) is sequentially connected with a horizontal flue (15), a turning flue chamber (16), a double flue (17) and a tail flue (18) to form a flue gas channel.
8. The 700 ℃ boiler heating surface arrangement device for preventing the reheated steam temperature from being substandard according to the claim 1 is characterized in that the water wall (3) and the reheated water wall (9) are connected through an expansion joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010792570.4A CN111780081A (en) | 2020-08-09 | 2020-08-09 | 700 ℃ boiler heating surface arrangement device for preventing reheated steam temperature from failing to reach standard |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010792570.4A CN111780081A (en) | 2020-08-09 | 2020-08-09 | 700 ℃ boiler heating surface arrangement device for preventing reheated steam temperature from failing to reach standard |
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| CN111780081A true CN111780081A (en) | 2020-10-16 |
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| CN202010792570.4A Pending CN111780081A (en) | 2020-08-09 | 2020-08-09 | 700 ℃ boiler heating surface arrangement device for preventing reheated steam temperature from failing to reach standard |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112628709A (en) * | 2020-12-28 | 2021-04-09 | 东方电气集团东方锅炉股份有限公司 | Super (super) critical W-shaped flame boiler |
| CN113280359A (en) * | 2021-06-25 | 2021-08-20 | 西安热工研究院有限公司 | Method for reducing contamination of convection heating surface of n-shaped high-sodium coal boiler |
| WO2023221609A1 (en) * | 2022-05-16 | 2023-11-23 | 东方电气集团东方锅炉股份有限公司 | Boiler furnace with steam-cooled wall, and system |
-
2020
- 2020-08-09 CN CN202010792570.4A patent/CN111780081A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112628709A (en) * | 2020-12-28 | 2021-04-09 | 东方电气集团东方锅炉股份有限公司 | Super (super) critical W-shaped flame boiler |
| CN113280359A (en) * | 2021-06-25 | 2021-08-20 | 西安热工研究院有限公司 | Method for reducing contamination of convection heating surface of n-shaped high-sodium coal boiler |
| WO2023221609A1 (en) * | 2022-05-16 | 2023-11-23 | 东方电气集团东方锅炉股份有限公司 | Boiler furnace with steam-cooled wall, and system |
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