CN111207379A - Structure for retarding high-temperature corrosion of convection heating surface of waste incineration waste heat boiler - Google Patents
Structure for retarding high-temperature corrosion of convection heating surface of waste incineration waste heat boiler Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 32
- 230000007797 corrosion Effects 0.000 title claims abstract description 27
- 238000005260 corrosion Methods 0.000 title claims abstract description 27
- 238000004056 waste incineration Methods 0.000 title claims abstract description 21
- 239000002918 waste heat Substances 0.000 title claims abstract description 19
- 230000000979 retarding effect Effects 0.000 title claims abstract description 7
- 238000005253 cladding Methods 0.000 claims abstract description 12
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 11
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 2
- 239000000779 smoke Substances 0.000 abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 238000001816 cooling Methods 0.000 abstract description 6
- 238000013021 overheating Methods 0.000 abstract description 6
- 230000006866 deterioration Effects 0.000 abstract description 4
- 206010022000 influenza Diseases 0.000 abstract description 4
- 238000012546 transfer Methods 0.000 abstract description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/10—Water tubes; Accessories therefor
- F22B37/107—Protection of water tubes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
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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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Abstract
The invention relates to a structure for retarding high-temperature corrosion of a convection heating surface of a waste incineration waste heat boiler. The invention avoids serious high-temperature corrosion through reasonable arrangement of the heating surfaces. The four flues of the waste incineration waste heat boiler are conventionally provided with water-cooling film walls, the ceiling and two side walls of the four flues are overheated, saturated steam from a steam drum in a steam-water flow firstly passes through the ceiling and the side walls, and the heat transfer deterioration phenomena such as steam-water layering and the like caused by the pressure-improved water-cooling system are avoided. The overheating ceiling and the cladding heat exchange medium are changed into single-phase medium, so that the heat transfer deterioration condition does not exist, and the device is relatively safe and reliable. Meanwhile, the overheating ceiling and the cladding can bear a part, the overheating steam absorbs heat, and the over-high smoke temperature entering the convection heating surface is avoided.
Description
Technical Field
The invention relates to a structure for retarding high-temperature corrosion of a convection heating surface of a waste incineration waste heat boiler.
Background
The garbage fuel has large fluctuation, and the fluctuation of the combustion process, the smoke composition, the smoke quantity and the smoke temperature is large; the smoke of the incinerator has complex components and contains chloride, alkali metal, heavy metal and the like; the content of solid matters with low melting point in the smoke dust is high. The steam parameters of existing waste incinerators remain relatively low due to the high concentration of chemical elements and high temperatures that make the hot face tube bundle susceptible to corrosion.
In the water-cooled wall area, due to the complex smoke atmosphere, the temperature of the outer wall of the pipe on the fire side of the area with higher smoke temperature is high, the pressure of the main steam is increased, the pressure of the steam drum and the water-cooled wall is increased accordingly, and the corresponding saturation temperature is increased correspondingly. The temperature of a steam-water mixing area in the water-cooled wall is increased, so that the temperature of the water-cooled wall is increased, and the corrosion risk is increased, so that the selection of the main steam pressure of the waste incineration waste heat boiler is mainly limited by the corrosion risk of the water-cooled wall.
The selection of the main steam temperature is mainly limited by the fact that after the temperature is increased, the corrosion risk of a high-temperature heating surface is directly aggravated. At present, the waste incineration waste heat boiler mainly takes medium temperature and medium pressure (4MPa, 400 ℃) and medium temperature and secondary high pressure (6.4MPa, 450 ℃) as main components. Along with the continuous decline of the income duty ratio of the subsidy of the garbage, the improvement of the power generation income has great significance to the garbage incineration power plant.
Disclosure of Invention
The purpose of the invention is: slow down the high temperature corrosion of the convection heating surface of the waste incineration exhaust-heat boiler.
In order to achieve the above purpose, the technical scheme of the invention is to provide a structure for slowing down the high-temperature corrosion of the convection heating surface of a waste incineration waste heat boiler, which is characterized by comprising a horizontal flue top superheater inlet header arranged in a horizontal flue, saturated steam from a boiler barrel is introduced into the horizontal flue top superheater inlet header and then enters the horizontal flue top superheater for absorbing heat, and then enters a horizontal flue top superheater outlet header, the horizontal flue top superheater outlet header is communicated with an inlet of a header on the rear half part side wall of the horizontal flue, an outlet of the header on the rear half part side wall of the horizontal flue is communicated with the rear half part side wall of the horizontal flue, superheated steam absorbed by the rear half part side wall of the horizontal flue is introduced into a lower header on the side wall of the horizontal flue and then enters the front half part side wall of the horizontal flue, and is absorbed by the front half part side wall of the horizontal flue and then is collected to an upper header on the front half part side wall of the horizontal flue, the header on the side cladding wall of the front half part of the horizontal flue is communicated with the inlet header of the first-level superheater, steam which flows out of the header on the side cladding wall of the front half part of the horizontal flue enters the first-level superheater to absorb heat and then is collected to the outlet header of the first-level superheater, the outlet header of the first-level superheater is communicated with the inlet header of the second-level superheater, the steam absorbs heat through the second-level superheater and then is collected to the outlet header of the second-level superheater, the outlet header of the second-level superheater is communicated with the inlet header of the first-level superheater, and the steam absorbs heat through the first-level superheater and the second-level superheater, the steam is collected to an outlet header of a second-level superheater, the outlet header of the second-level superheater is communicated with an inlet header of a third-level superheater, the steam is collected to an outlet header of the third-level superheater after being absorbed by the third-level superheater, and the outlet header of the third-level superheater is communicated with a high-pressure cylinder of the steam turbine;
most steam in high-exhaust steam of the steam turbine is introduced into an inlet header of a first-stage reheater I, and then is subjected to heat absorption by the first-stage reheater I, the second-stage reheater and the third-stage reheater in sequence and then is collected to an outlet header of the third-stage reheater I; a small part of steam in the high exhaust steam of the steam turbine is used for participating in adjusting the temperature of the reheated steam, the small part of steam is merged with the reheated steam from the outlet header of the first-stage reheater III and then is introduced into the inlet header of the second-stage reheater, the merged steam is subjected to heat exchange by the second-stage reheater and then is converged into the outlet header of the second-stage reheater, and then the merged steam is sent to a steam turbine intermediate pressure cylinder to do work;
the primary superheater II, the tertiary superheater, the secondary reheater, the secondary superheater II, the secondary superheater I and the primary superheater I are sequentially arranged in the horizontal flue; the first-stage reheater I, the second-stage reheater II and the third-stage reheater III are arranged in the tail flue.
Preferably, a first desuperheater is arranged on a pipeline connecting an outlet header of the first-stage superheater and an inlet header of the second-stage superheater;
a second desuperheater is arranged on a pipeline connecting an outlet header of the second superheater with an inlet header of the third superheater;
most steam in the high-exhaust steam of the steam turbine is introduced into an inlet header of the first-stage reheater through a third desuperheater;
the invention provides a structure for slowing down the high-temperature corrosion of a convection heating surface of a waste incineration waste heat boiler, which is characterized by comprising a horizontal flue furnace top superheater inlet header arranged in a horizontal flue, saturated steam from a boiler barrel is introduced into the horizontal flue furnace top superheater inlet header and then enters the horizontal flue furnace top superheater to absorb heat, and then enters a horizontal flue furnace top superheater outlet header, the horizontal flue furnace top superheater outlet header is communicated with an inlet of a header on the rear half side wall of the horizontal flue, an outlet of the header on the rear half side wall of the horizontal flue is communicated with the rear half side wall of the horizontal flue, superheated steam absorbed by the heat absorption of the rear half side wall of the horizontal flue is introduced into a lower header on the side wall of the horizontal flue and then enters the front half side wall of the horizontal flue, and then is collected to an upper header on the front half side wall of the horizontal flue, a header on the side cladding wall of the front half part of the horizontal flue is communicated with an inlet header of a primary superheater, steam which flows out of the header on the side cladding wall of the front half part of the horizontal flue enters the primary superheater from the inlet header of the primary superheater to absorb heat and then is collected to an outlet header of the primary superheater, an outlet header of the primary superheater is communicated with an inlet header of a primary superheater, the steam is collected to an outlet header of a secondary superheater after being absorbed by the primary superheater and the secondary superheater, an outlet header of the secondary superheater is communicated with an inlet header of a tertiary superheater, the steam is collected to an outlet header of the tertiary superheater after being absorbed by the tertiary superheater, and an outlet header of the tertiary superheater is communicated with a high-pressure cylinder of a steam turbine;
high exhaust steam of the steam turbine is introduced into an inlet header of a first-stage reheater I, absorbs heat through the first-stage reheater I and a second-stage reheater II and then is collected to an outlet header of the first-stage reheater I, the outlet header of the first-stage reheater I is communicated with an inlet header of a third-stage reheater I, reheated steam after heat exchange of the third-stage reheater I is collected to an outlet header of the third-stage reheater I, then is introduced into an inlet header of a second-stage reheater I, is collected to an outlet header of the second-stage reheater after heat exchange of the second-stage reheater I, and finally is sent to a steam turbine intermediate pressure cylinder for;
the primary reheater III, the tertiary superheater, the secondary reheater, the secondary superheater II, the secondary superheater I and the primary superheater are sequentially arranged in the horizontal flue; the first-stage reheater and the second-stage reheater are arranged in the tail flue.
Preferably, a third desuperheater is arranged on a pipeline of an outlet header of the primary superheater and an inlet header of the secondary superheater;
a fourth desuperheater is arranged on a pipeline of an outlet header of the second superheater communicated with an inlet header of the third superheater;
and high-exhaust steam of the steam turbine is introduced into an inlet header of the first-stage reheater through the desuperheater five.
The invention provides a structure for slowing down the high-temperature corrosion of a convection heating surface of a waste incineration waste heat boiler, which is characterized by comprising a horizontal flue furnace top superheater inlet header arranged in a horizontal flue, saturated steam from a boiler barrel is introduced into the horizontal flue furnace top superheater inlet header and then enters the horizontal flue furnace top superheater to absorb heat, the saturated steam absorbs heat through the horizontal flue furnace top superheater and then enters a horizontal flue furnace top superheater outlet header, the horizontal flue furnace top superheater outlet header is communicated with an inlet of a header on a rear half side wall of the horizontal flue, an outlet of the header on the rear half side wall of the horizontal flue is communicated with a rear half side wall of the horizontal flue, the superheated steam absorbed heat through the rear half side wall of the horizontal flue is introduced into a lower header on the side wall of the horizontal flue and then enters a front half side wall of the horizontal flue through a lower header on the side wall of the horizontal flue, then collecting the steam to a header on a side wrapping wall of the front half part of the horizontal flue, wherein the header on the side wrapping wall of the front half part of the horizontal flue is communicated with an inlet header of a first-level superheater, the steam which flows out of the header on the side wrapping wall of the front half part of the horizontal flue enters the first-level superheater for absorbing heat through the inlet header of the first-level superheater and then is collected to an outlet header of the first-level superheater, an outlet header of the first-level superheater is communicated with an inlet header of a second-level superheater, the steam is collected to an outlet header of the second-level superheater after absorbing heat through the first-level superheater and the second-level superheater, an outlet header of the second-level superheater is communicated with an inlet header of a third-level superheater, and the steam is collected to an outlet header of the third-level superheater after absorbing heat through the third-level superheater, finally, the working fluid is sent to a high-pressure cylinder of a steam turbine to do work;
the primary superheater II, the tertiary superheater, the secondary superheater II, the secondary superheater I and the primary superheater I are sequentially arranged in the horizontal flue.
Preferably, a sixth desuperheater is arranged on a pipeline of an outlet header of the second primary superheater communicated with an inlet header of the first secondary superheater;
and a seventh desuperheater is arranged on a pipeline of the outlet header of the second-stage superheater communicated with the inlet header of the third-stage superheater.
The invention has the following effects:
1) the invention avoids serious high-temperature corrosion through reasonable arrangement of the heating surfaces.
2) The four flues of the waste incineration waste heat boiler conventionally adopt water-cooling membrane type walls, the ceiling and two side walls of the four flues are overheated, saturated steam from a steam drum in a steam-water flow firstly passes through the ceiling and the side walls, and the highest temperature of the walls is about 10 ℃ higher than that of water-cooling cladding. However, for the heating surface of the ceiling, the steam-water density difference of the water cooling system is reduced along with the increase of the pressure, the water circulation characteristic of the water cooling ceiling is reduced, the heat transfer deterioration phenomena such as steam-water stratification and the like are easy to occur, the heat transfer deterioration condition does not exist when the heat exchange medium of the overheating ceiling is changed into a single-phase medium, and the heating surface of the ceiling is relatively safe and reliable. Meanwhile, the overheating ceiling can bear a part of heat, the overheating steam absorbs heat, and the over-high smoke temperature entering the convection heating surface is avoided.
3) According to the invention, part of the low-temperature heating surface is arranged in front, so that the superposition of high smoke temperature and high steam temperature can be effectively avoided, and the front part of the low-temperature heating surface controls the smoke temperature at the inlet of the high-temperature convection heating surface at a lower level, so that the corrosion of the high-temperature heating surface can be effectively avoided. The low-temperature superheater front-mounted device is compared with a low-temperature reheater front-mounted scheme.
Drawings
FIG. 1 is a schematic view of the structure for alleviating high-temperature corrosion on the convection heating surface of a waste incineration waste heat boiler in embodiment 1;
FIG. 2 is a schematic view of the structure for alleviating high-temperature corrosion on the convection heating surface of the waste incineration waste heat boiler in embodiment 2;
fig. 3 is a schematic view of the structure for alleviating high-temperature corrosion of the convection heating surface of the waste incineration waste heat boiler in embodiment 3.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Example 1
The structure for slowing down the high-temperature corrosion of the convection heating surface of the waste incineration waste heat boiler disclosed by the embodiment is shown in figure 1:
saturated steam at the outlet of the drum 1 is introduced into a horizontal flue furnace top superheater inlet header 3 through a connecting pipe 2, and the furnace top superheater inlet header 3 is communicated with a horizontal flue furnace top superheater 4. The steam absorbs heat through the horizontal flue furnace top superheater 4 and then enters the horizontal flue furnace top superheater outlet header 5. An outlet header 5 of a superheater on the top of the horizontal flue is communicated with a header 6 on a side wall of the rear half part of the horizontal flue, and the header 6 on the side wall of the rear half part of the horizontal flue is communicated with the side wall of the rear half part of the horizontal flue. The superheated steam absorbed by the side wrapping wall of the rear half part of the horizontal flue is introduced into a lower header 7 of the side wrapping wall of the horizontal flue, then enters the side wrapping wall of the front half part of the horizontal flue, and is collected into a header 8 of the side wrapping wall of the front half part of the horizontal flue. And the steam which is discharged from the upper header 8 of the side wrapping wall of the front half part of the horizontal flue is led out to an inlet header 10 of a first-stage superheater 11 through a connecting pipe 9.
The outlet steam of the furnace top and the cladding superheater enters the primary superheater 11 from the inlet header 10 of the primary superheater 11, absorbs heat through the primary superheater 11 and then is collected to the outlet header 12 of the primary superheater 11. The outlet header 12 is communicated with an inlet header 14 of a second primary superheater 15 through a connecting pipe 13. The steam is introduced into the second primary superheater 15 through the inlet header 14, absorbs heat through the second primary superheater 15, and then is collected to the outlet header 16 of the second primary superheater 15. The outlet header 16 is communicated with an inlet header 19 of a first secondary superheater 20 through a connecting pipe 17 and a desuperheater 18. Steam enters the first secondary superheater 20 through the inlet header 19, absorbs heat through the first secondary superheater 20 and the second secondary superheater 21, and then is collected to the outlet header 22 of the second secondary superheater 21. The outlet header 22 is communicated with an inlet header 24 of a tertiary superheater 25 through a connecting pipe 22 and a desuperheater 23. Steam enters the tertiary superheater 25 through the inlet header 24, absorbs heat through the tertiary superheater 25, then is collected to the outlet header 26 of the tertiary superheater 25, and finally is sent to the high-pressure cylinder of the steam turbine for acting through the outlet connecting pipe 27 of the boiler.
Most of the turbine high-exhaust steam is introduced into the inlet header 30 of the primary reheater A31 through the connecting pipe 28 and the desuperheater 29, absorbs heat through the primary reheater A31, the primary reheater B32 and the primary reheater C33, and then is collected to the outlet header 34 of the primary reheater C33. And a small part of high exhaust steam of the steam turbine participates in regulating the temperature of the reheated steam, is merged with the reheated steam subjected to heat exchange by the primary reheater A31, the primary reheater B32 and the primary reheater C33 through the connecting pipe 35, is introduced into the inlet header 37 of the secondary reheater 38 through the connecting pipe 36, is merged into the outlet header 39 of the secondary reheater 38 after heat exchange by the secondary reheater 38, and is finally sent into a steam turbine intermediate pressure cylinder for acting through the connecting pipe 40.
In the embodiment 1, the superheated steam has a large specific heat capacity, the wall temperature deviation of the heating surface pipe is easy to control, and the wall temperature is prevented from rising when the superheated steam is placed in an area with the smoke temperature higher than 600 ℃.
Example 2
The structure for slowing down the high-temperature corrosion of the convection heating surface of the waste incineration waste heat boiler disclosed by the embodiment is shown in fig. 2:
saturated steam at the outlet of the drum 1 is introduced into a horizontal flue furnace top superheater inlet header 3 through a connecting pipe 2, and the furnace top superheater inlet header 3 is communicated with a horizontal flue furnace top superheater 4. The heat is absorbed by the horizontal flue furnace top superheater 4 and then enters the horizontal flue furnace top superheater outlet header 5. An outlet header 5 of a superheater on the top of the horizontal flue is communicated with a header 6 on a side wall of the rear half part of the horizontal flue, and the header 6 on the side wall of the rear half part of the horizontal flue is communicated with the side wall of the rear half part of the horizontal flue. The superheated steam absorbed by the side wrapping wall of the rear half part of the horizontal flue is introduced into a lower collecting box 7 of the side wrapping wall of the horizontal flue, then enters the side wrapping wall of the front half part of the horizontal flue, and is collected to a collecting box 8 of the side wrapping wall of the front half part of the horizontal flue. And the steam which is discharged from the upper header 8 of the side wrapping wall of the front half part of the horizontal flue is led out to an inlet header 10 of a first-stage superheater 11 through a connecting pipe 9.
The outlet steam of the furnace top and the cladding superheater enters the first primary superheater 11 from the inlet header 10 of the first primary superheater 11 to absorb heat and then is collected to the outlet header 12 of the first primary superheater 11. The outlet header 12 enters the inlet header 19 of the first secondary superheater 20 through the connecting pipe 41 and the desuperheater 42, absorbs heat through the first secondary superheater 20 and the second secondary superheater 20, and then is collected to the outlet header 22 of the second secondary superheater 20. The outlet header 22 is connected to the inlet header 24 of the tertiary superheater 25 via a connecting pipe 43 and a desuperheater 44. The steam absorbs heat in the tertiary superheater 25 and then is collected to the outlet header 26 of the tertiary superheater 25, and finally is sent to the high-pressure cylinder of the steam turbine for acting through the outlet connecting pipe 45 of the superheater.
The high exhaust steam of the steam turbine is introduced into the inlet header 30 of the primary reheater A31 through the connecting pipe 48 and the desuperheater 47, absorbs heat through the primary reheater A31 and the primary reheater B32, and then is collected to the outlet header 34 of the primary reheater B32. The reheated steam after heat exchange in the primary reheater C33 is then merged to the outlet header 34 of the primary reheater C33 via the connection pipe 46 to the inlet header 49 of the primary reheater C33, and is then introduced to the inlet header 37 of the secondary reheater 38 via the connection pipe 50. The steam is collected to an outlet header 39 of the secondary reheater 38 after heat exchange in the secondary reheater 38, and finally sent to a steam turbine intermediate pressure cylinder to do work through a connecting pipe 48.
Example 3
For the situation that the temperature of the superheated steam is only increased without a flue gas reheater, the structure for slowing down the high-temperature corrosion of the convection heating surface of the waste incineration exhaust-heat boiler disclosed by the embodiment is shown in fig. 3:
saturated steam at the outlet of the drum 1 is introduced into a horizontal flue furnace top superheater inlet header 3 through a connecting pipe 2, and the furnace top superheater inlet header 3 is communicated with a horizontal flue furnace top superheater 4. The heat is absorbed by the horizontal flue furnace top superheater 4 and then enters the horizontal flue furnace top superheater outlet header 5. An outlet header 5 of a superheater on the top of the horizontal flue is communicated with a header 6 on a side wall of the rear half part of the horizontal flue, and the header 6 on the side wall of the rear half part of the horizontal flue is communicated with the side wall of the rear half part of the horizontal flue. The superheated steam absorbed by the side wrapping wall of the rear half part of the horizontal flue is introduced into a lower collecting box 7 of the side wrapping wall of the horizontal flue, then enters the side wrapping wall of the front half part of the horizontal flue, and is collected to a collecting box 8 of the side wrapping wall of the front half part of the horizontal flue. The steam which is discharged from the upper header 8 of the side wrapping wall of the front half part of the horizontal flue is led out to an inlet header 10 of a first-stage superheater 11 through a connecting pipe 9
The outlet steam of the furnace top and the cladding superheater enters the first primary superheater 11 from the inlet header 10 of the first primary superheater 11 to absorb heat and then is collected to the outlet header 12 of the first primary superheater 11. The outlet header 12 is communicated with the inlet header 14 of the second primary superheater 15 through a connecting pipe 51. And the steam absorbs heat through the second primary superheater 15 and then is collected to an outlet header 16 of the second primary superheater 15. The outlet header 16 is communicated with the inlet header 19 of the first secondary superheater 20 through a connecting pipe 52 and a desuperheater 53. And the steam absorbs heat through the first secondary superheater 20 and the second secondary superheater 21 and then is collected to an outlet header 22 of the second secondary superheater 21. The outlet header 22 is communicated with the inlet header 24 of the tertiary superheater 25 via a connecting pipe 54 and a desuperheater 55. The steam absorbs heat in the tertiary superheater 25 and then is collected to the outlet header 26 of the tertiary superheater 25, and finally is sent to the high-pressure cylinder of the steam turbine for acting through the outlet connecting pipe 56 of the superheater.
Claims (6)
1. A structure for retarding the high-temp corrosion of convection heating surface of afterheat boiler for garbage incineration is composed of an inlet header of the superheater on top of horizontal flue, the saturated steam from boiler drum, the inlet header of said superheater, the outlet header of said superheater, the side wall of the rear half wall of horizontal flue, the side wall of the front half wall of horizontal flue, the superheated steam, which is sucked by the side wall of the rear half wall of horizontal flue, and the upper header of the side wall of the front half wall, the header on the side cladding wall of the front half part of the horizontal flue is communicated with the inlet header of the first-level superheater, steam which flows out of the header on the side cladding wall of the front half part of the horizontal flue enters the first-level superheater to absorb heat and then is collected to the outlet header of the first-level superheater, the outlet header of the first-level superheater is communicated with the inlet header of the second-level superheater, the steam absorbs heat through the second-level superheater and then is collected to the outlet header of the second-level superheater, the outlet header of the second-level superheater is communicated with the inlet header of the first-level superheater, and the steam absorbs heat through the first-level superheater and the second-level superheater, the steam is collected to an outlet header of a second-level superheater, the outlet header of the second-level superheater is communicated with an inlet header of a third-level superheater, the steam is collected to an outlet header of the third-level superheater after being absorbed by the third-level superheater, and the outlet header of the third-level superheater is communicated with a high-pressure cylinder of the steam turbine;
most steam in high-exhaust steam of the steam turbine is introduced into an inlet header of a first-stage reheater I, and then is subjected to heat absorption by the first-stage reheater I, the second-stage reheater and the third-stage reheater in sequence and then is collected to an outlet header of the third-stage reheater I; a small part of steam in the high exhaust steam of the steam turbine is used for participating in adjusting the temperature of the reheated steam, the small part of steam is merged with the reheated steam from the outlet header of the first-stage reheater III and then is introduced into the inlet header of the second-stage reheater, the merged steam is subjected to heat exchange by the second-stage reheater and then is converged into the outlet header of the second-stage reheater, and then the merged steam is sent to a steam turbine intermediate pressure cylinder to do work;
the primary superheater II, the tertiary superheater, the secondary reheater, the secondary superheater II, the secondary superheater I and the primary superheater I are sequentially arranged in the horizontal flue; the first-stage reheater I, the second-stage reheater II and the third-stage reheater III are arranged in the tail flue.
2. The structure for relieving the high-temperature corrosion of the convection heating surface of the waste incineration waste heat boiler as recited in claim 1, wherein a first desuperheater is arranged on a pipeline connecting an outlet header of the second superheater and an inlet header of the first superheater;
a second desuperheater is arranged on a pipeline connecting an outlet header of the second superheater with an inlet header of the third superheater;
most of steam in the high-exhaust steam of the steam turbine is introduced into an inlet header of the first-stage reheater through a third desuperheater.
3. A structure for retarding the high-temp corrosion of convection heating surface of afterheat boiler for garbage incineration is composed of an inlet header of horizontal flue top superheater, a horizontal flue top superheater inlet header, a horizontal flue top superheater outlet header communicated with the inlet of the header on the back half wall of horizontal flue, a horizontal flue top superheater outlet header communicated with the front half wall of horizontal flue, and a horizontal flue top superheater outlet header communicated with the inlet of the first-stage superheater, steam which is discharged from a header on the side wrapping wall of the front half part of the horizontal flue enters a first-stage superheater from an inlet header of the first-stage superheater to absorb heat and then is collected to an outlet header of the first-stage superheater, an outlet header of the first-stage superheater is communicated with an inlet header of a first-stage superheater, the steam is absorbed by the first-stage superheater and a second-stage superheater and then is collected to an outlet header of a second-stage superheater, an outlet header of the second-stage superheater is communicated with an inlet header of a third-stage superheater, the steam is collected to an outlet header of the third-stage superheater after being absorbed by the third-stage superheater, and an outlet header of the third-stage superheater is communicated;
high exhaust steam of the steam turbine is introduced into an inlet header of a first-stage reheater I, absorbs heat through the first-stage reheater I and a second-stage reheater II and then is collected to an outlet header of the first-stage reheater I, the outlet header of the first-stage reheater I is communicated with an inlet header of a third-stage reheater I, reheated steam after heat exchange of the third-stage reheater I is collected to an outlet header of the third-stage reheater I, then is introduced into an inlet header of a second-stage reheater I, is collected to an outlet header of the second-stage reheater after heat exchange of the second-stage reheater I, and finally is sent to a steam turbine intermediate pressure cylinder for;
the primary reheater III, the tertiary superheater, the secondary reheater, the secondary superheater II, the secondary superheater I and the primary superheater are sequentially arranged in the horizontal flue; the first-stage reheater and the second-stage reheater are arranged in the tail flue.
4. The structure for relieving the high-temperature corrosion of the convection heating surface of the waste incineration waste heat boiler as recited in claim 3, wherein a third desuperheater is arranged on a pipeline of the outlet header of the primary superheater communicated with the inlet header of the primary superheater;
a fourth desuperheater is arranged on a pipeline of an outlet header of the second superheater communicated with an inlet header of the third superheater;
and high-exhaust steam of the steam turbine is introduced into an inlet header of the first-stage reheater through the desuperheater five.
5. A structure for retarding the high-temp corrosion of convection heating surface of afterheat boiler for garbage incineration is composed of an inlet header of the superheater on top of horizontal flue, the saturated steam from boiler drum, the inlet header of said superheater, the outlet header of said header, and the lower header of said header, then collecting the steam to a header on a side wrapping wall of the front half part of the horizontal flue, wherein the header on the side wrapping wall of the front half part of the horizontal flue is communicated with an inlet header of a first-level superheater, the steam which flows out of the header on the side wrapping wall of the front half part of the horizontal flue enters the first-level superheater for absorbing heat through the inlet header of the first-level superheater and then is collected to an outlet header of the first-level superheater, an outlet header of the first-level superheater is communicated with an inlet header of a second-level superheater, the steam is collected to an outlet header of the second-level superheater after absorbing heat through the first-level superheater and the second-level superheater, an outlet header of the second-level superheater is communicated with an inlet header of a third-level superheater, and the steam is collected to an outlet header of the third-level superheater after absorbing heat through the third-level superheater, finally, the working fluid is sent to a high-pressure cylinder of a steam turbine to do work;
the primary superheater II, the tertiary superheater, the secondary superheater II, the secondary superheater I and the primary superheater I are sequentially arranged in the horizontal flue.
6. The structure for relieving the high-temperature corrosion of the convection heating surface of the waste incineration waste heat boiler as defined in claim 5, wherein a sixth desuperheater is arranged on a pipeline of an outlet header of the second primary superheater communicated with an inlet header of the first secondary superheater;
and a seventh desuperheater is arranged on a pipeline of the outlet header of the second-stage superheater communicated with the inlet header of the third-stage superheater.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114060824A (en) * | 2021-10-15 | 2022-02-18 | 北京首创环境科技有限公司 | Waste incineration waste heat recovery system and waste incineration system |
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| CN101294708A (en) * | 2008-04-25 | 2008-10-29 | 东南大学 | City life rubbish fluidized bed gasification combustion processing method |
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