CN116164270A - T-shaped arranged opposite-firing secondary reheating boiler - Google Patents

T-shaped arranged opposite-firing secondary reheating boiler Download PDF

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Publication number
CN116164270A
CN116164270A CN202211617666.2A CN202211617666A CN116164270A CN 116164270 A CN116164270 A CN 116164270A CN 202211617666 A CN202211617666 A CN 202211617666A CN 116164270 A CN116164270 A CN 116164270A
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CN
China
Prior art keywords
temperature
flue
low
steam
boiler
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Pending
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CN202211617666.2A
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Chinese (zh)
Inventor
郭秀娟
夏良伟
于强
孙洪民
宋宝军
魏国华
宋国庆
董清梅
殷亚宁
苗闪闪
郭馨
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Harbin Boiler Co Ltd
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Harbin Boiler Co Ltd
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Priority to CN202211617666.2A priority Critical patent/CN116164270A/en
Publication of CN116164270A publication Critical patent/CN116164270A/en
Pending legal-status Critical Current

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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
    • F22B1/22—Methods of steam generation characterised by form of heating method using combustion under pressure substantially exceeding atmospheric pressure
    • 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
    • F22B37/26—Steam-separating arrangements
    • 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
    • F22D1/36—Water and air preheating systems
    • F22D1/38—Constructional features of water and air preheating systems
    • 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
    • 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
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chimneys And Flues (AREA)

Abstract

The invention relates to a double reheat boiler with T-shaped arrangement and opposite combustion, which aims to solve the problem that the low load of the existing double reheat boiler is difficult to reach the rated reheat steam temperature due to low heat transfer temperature difference, a hearth is surrounded by a water cooling wall, two screen superheaters are arranged in a radiation area at the top of the hearth, high-temperature superheaters are arranged at two sides of the top of the hearth, a single reheat high-temperature reheater is arranged in a horizontal flue at the left side of the top of the hearth, a single reheat low-temperature reheater, a low-temperature superheater and an economizer are arranged in a vertical flue at the left side of the hearth, a double reheat high-temperature reheater, a low-temperature superheater and an economizer are arranged in a horizontal flue at the right side of the top of the hearth, a plurality of combustors are symmetrically arranged at two sides of the hearth, steam outlets of steam-water separators are communicated with an inlet header at the upper part, and water outlets of the steam-water separators are sequentially communicated with a water storage tank and a recirculating pump. The invention belongs to the technical field of boilers.

Description

T-shaped arranged opposite-firing secondary reheating boiler
Technical Field
The invention relates to a double reheat boiler, in particular to a T-shaped arranged opposite-firing double reheat boiler. Belongs to the technical field of boilers.
Background
The higher the steam parameter of the power station boiler is, the more the heating times are, the higher the efficiency of the thermodynamic cycle is, the continuous development of electric power industry is realized, the pursuit of economy, high efficiency, energy conservation and emission reduction of the generator set is higher, and the continuous development of the power station boiler to higher parameters is promoted. The process is developed from subcritical boilers to supercritical and ultra-supercritical boilers, and is quickly changed into efficient ultra-supercritical once-reheat boilers. The main steam temperature of the boiler is increased to 605 ℃, and the reheat steam temperature is increased to 623 ℃. On the basis, the economic efficiency of the unit can be further improved by adopting a secondary reheating technology, the thermal efficiency of the unit can be improved by about 1.5% -2.0%, the coal consumption of the boiler can be obviously reduced, the energy is saved, and the secondary reheating boiler is a high-efficiency and low-pollution coal-fired power generation technology and has strong market competitiveness.
Compared with a single reheat boiler, the double reheat boiler is additionally provided with a set of reheater system and a first-stage high-temperature heating surface, so that the outlet steam temperature of three heating surfaces of the double reheat boiler exceeds 600 ℃, the matching difficulty of a hearth and the heating surfaces is increased, the existing double reheat boiler is provided with two types of arrangement and tower arrangement, the high-temperature heating surfaces of the two types of arrangement are sequentially arranged along the flow direction of smoke, namely, the high-temperature superheater, the single reheat high-temperature reheater and the double reheat high-temperature reheater are positioned at the last, the heat transfer temperature difference of the double reheat high-temperature reheater is small, and particularly, the heat transfer temperature difference is smaller along with the reduction of the smoke temperature in low load, so that the low load cannot reach the rated steam temperature, and in order to enhance the temperature regulation capability, the double reheat boiler is provided with various temperature regulation modes including the front reheater, the tail three flues, the double flue smoke baffle+swing burner, the smoke recirculation and the like.
The high-temperature reheater is arranged in front of the high-temperature superheater in a front-arranged mode of the reheater, so that the radiation heat absorption capacity of the reheater is increased, the problem of low-load undertemperature is solved, but the mass flow rate of the reheater is low, the cooling capacity is poor, and the wall temperature control difficulty is increased. The three-flue arrangement mode is complex in wall covering system, and the range for adjusting the reheat steam temperature is limited. For the boiler with the reheat steam temperature of 623 ℃, the problem of low-load heat exchange capacity can be solved by adopting a flue gas recirculation mode, but a complex flue gas recirculation system and a recirculation fan are required to be added. With further improvement of the reheat steam temperature, the reheat steam temperature is improved to 633 ℃, the next target is improved to 650-720 ℃, if a mode of sequential arrangement is still adopted, the inlet smoke temperature of the secondary reheat high-temperature reheater is reduced to about 750 ℃ under low load, the outlet smoke temperature is about 700 ℃, the heat transfer temperature difference can not meet the heat transfer requirement, and the problem of solving the heat transfer temperature difference becomes the key of whether the reheat steam temperature can be further improved.
Disclosure of Invention
The invention provides a T-shaped arranged opposite firing secondary reheat boiler, which aims to solve the problem that the rated reheat steam temperature is difficult to reach due to low heat transfer temperature difference of the low load of the conventional secondary reheat boiler.
The invention solves the technical problems by the following scheme:
a T-shaped arranged opposite-firing double reheat boiler comprises a hearth, two screen-type superheaters, two high-temperature superheaters, a single reheat high-temperature reheater, a single reheat low-temperature reheater, two low-temperature superheaters, two economizers, two air preheaters, a double reheat high-temperature reheater, a double reheat low-temperature reheater, a steam-water separator, a water storage tank, a recirculation pump and a plurality of burners; the furnace is surrounded by the water-cooled wall, the radiation area at the top of the furnace is provided with two screen type superheaters, the flame folding angles at two sides of the top of the furnace are provided with high-temperature superheaters, the horizontal flue at the left side of the top of the furnace is internally provided with a single reheating high-temperature reheater, a low-temperature superheater and a coal economizer, the horizontal flue at the right side of the top of the furnace is internally provided with a double reheating high-temperature reheater, a double reheating low-temperature reheater and a coal economizer, the vertical flue at the right side of the furnace is internally provided with a double reheating low-temperature reheater, a low-temperature superheater and a coal economizer, a plurality of burners are symmetrically arranged at two sides of the furnace, steam outlets of steam-water separators are communicated with an inlet header at the upper part, and water outlets of the steam-water separators are sequentially communicated with a water storage tank and a recirculation pump.
Further, the left tail vertical flue and the right vertical flue on the hearth are double flues.
Further, the flue gas recycling system further comprises a left first flue, a left second flue, a right first flue and a right second flue, wherein a primary reheating low-temperature reheater is arranged in the left first flue, a secondary reheating low-temperature reheater is arranged in the right first flue, one low-temperature superheater is arranged in the left second flue, the other low-temperature superheater is arranged in the right second flue, and an economizer is arranged below each low-temperature superheater.
Further, it also comprises two tail fume baffles; the bottom of the left first flue and the bottom of the left second flue are provided with a tail smoke baffle, and the bottom of the right first flue and the bottom of the right second flue are provided with a tail smoke baffle.
Further, the burner is a swirl burner.
Further, a steam outlet of the steam-water separator is communicated with an ultrahigh pressure cylinder of the steam turbine through a low-temperature superheater, a screen superheater and a high-temperature superheater; the turbine ultrahigh pressure cylinder is communicated with the turbine high pressure cylinder through the primary reheating low temperature reheater and the primary reheating high temperature reheater; the turbine high-pressure cylinder is communicated with the turbine medium-pressure cylinder through the secondary reheating low-temperature reheater and the secondary reheating high-temperature reheater.
Further, it also comprises two air preheaters; an air preheater is arranged at the bottom end of the left vertical flue, and an air preheater is arranged at the bottom end of the right vertical flue.
The invention has the most outstanding characteristics and remarkable beneficial effects that:
1. the invention overcomes the defects of the prior art, and by adopting a T-shaped arrangement mode, after the primary reheating high-temperature reheater and the secondary reheating high-temperature reheater are close to the hearth outlet high-temperature superheater, the heat transfer temperature difference is increased, thereby being beneficial to ensuring the rated steam temperature, increasing the temperature regulation performance of the secondary reheating boiler and further improving the steam parameter performance.
2. This application boiler adopts T type arrangement, has two furnace exports about, two horizontal flues and the vertical flue of afterbody, is equivalent to arranging boiler horizontal rotation 90 with conventional pi, becomes the front and back two sides with boiler furnace side, again with the horizontal flue and the vertical flue of afterbody of boiler along furnace central line projection, forms about two independent horizontal flues and the vertical flue of afterbody.
Drawings
FIG. 1 is a front view of the general layout of a T-arrangement opposed firing double reheat boiler in accordance with the present invention;
FIG. 2 is a schematic diagram of a start-up system for a T-arrangement opposed firing double reheat boiler in accordance with the present invention;
FIG. 3 is a schematic view of the flue arrangement of a T-arrangement opposed firing double reheat boiler in accordance with the present invention.
Detailed Description
The first embodiment is as follows: describing the present embodiment with reference to fig. 1 to 3, a T-shaped arranged opposed firing secondary reheat boiler according to the present embodiment includes a furnace 1, two screen superheaters 2, two high temperature superheaters 3, a primary reheat high temperature reheater 4, a primary reheat low temperature reheater 5, two low temperature superheaters 6, two economizers 7, two air preheaters 9, a secondary reheat high temperature reheater 10, a secondary reheat low temperature reheater 11, a steam-water separator 13, a water storage tank 14, a recirculation pump 15, and a plurality of burners 12; the furnace 1 is surrounded by the water-cooled wall, the radiation area at the top of the furnace 1 is provided with two screen type superheaters 2, the flame folding angles at two sides of the top of the furnace 1 are provided with high-temperature superheaters 3, the horizontal flue at the left side of the top of the furnace 1 is internally provided with a single-reheat high-temperature reheater 4, the vertical flue at the left side of the furnace 1 is internally provided with a single-reheat low-temperature reheater 5, a low-temperature superheater 6 and an economizer 7, the horizontal flue at the right side of the top of the furnace 1 is internally provided with a double-reheat high-temperature reheater 10, the vertical flue at the right side of the furnace 1 is internally provided with a double-reheat low-temperature reheater 11, a low-temperature superheater 6 and an economizer 7, a plurality of burners 12 are symmetrically arranged at two sides of the furnace 1, the steam outlet of a steam-water separator 13 is communicated with an upper inlet header, and the water outlet of the steam-water separator 13 is sequentially communicated with a water storage tank 14 and a recirculation pump 15.
The screen superheater 2 of the embodiment is arranged in the upper hearth radiation area and consists of a left part and a right part which are connected in parallel. In this embodiment, two high-temperature superheaters 3 are arranged in parallel in the upper flues of two folded flame corners, respectively. The lower part of the steam-water separator 13 is connected with a water storage tank 14, the lower part of the water storage tank 14 is connected with a recirculation pump 15, and the recirculation pump 15 is connected with an inlet water supply pipeline of the economizer 7 through a recirculation pipeline.
The hearth 1 adopts a spiral pipe ring and a vertical pipe ring water cooling wall, and the upper parts of the water cooling walls at the two sides are bent to form a left folding flame angle and a right folding flame angle.
In the specific embodiment, the superheater is temperature-regulated by adopting a coal-water ratio and a desuperheater.
In the embodiment, the boiler capacity is 600MW-1300MW, and the steam temperature at the outlets of the high-temperature superheater 3, the primary reheating high-temperature reheater 4 and the secondary reheating high-temperature reheater 10 is 600-700 ℃.
The second embodiment is as follows: the embodiment is described with reference to fig. 1, and the T-shaped arranged double reheat boiler with opposite combustion is provided in the embodiment, where the left tail vertical flue and the right vertical flue on the hearth 1 are both double flues. Other structural connections are the same as in the first embodiment.
And a third specific embodiment: describing the present embodiment with reference to fig. 1 and 3, a T-shaped arranged opposed firing secondary reheat boiler according to the present embodiment further includes a left side first flue 16, a left side second flue 17, a right side first flue 18 and a right side second flue 19, a primary reheat low temperature reheater 5 is installed in the left side first flue 16, a secondary reheat low temperature reheater 11 is installed in the right side first flue 18, one low temperature superheater 6 is installed in the left side second flue 17, another low temperature superheater 6 is installed in the right side second flue 19, and an economizer 7 is installed under each low temperature superheater 6. Other structural connection relationships are the same as those of the second embodiment.
The specific embodiment IV is as follows: the present embodiment will be described with reference to fig. 1 and 3, and a T-shaped arranged opposed firing double reheat boiler according to the present embodiment further includes two tail flue gas baffles 8; the bottom of the left first flue 16 and the bottom of the left second flue 17 are provided with a tail flue gas baffle 8, and the bottom of the right first flue 18 and the bottom of the right second flue 19 are provided with a tail flue gas baffle 8. Used for adjusting the flue gas flow of the two flues. And meanwhile, the primary reheater and the secondary reheater adopt a tail flue gas baffle 8 to regulate temperature. Other structural connection relationships are the same as those of the second embodiment.
The lower parts of the left first flue 16 and the left second flue 17 of the present embodiment are provided with tail flue gas baffles 8 for adjusting the flue gas flow of the two flues, and the lower parts of the right first flue 18 and the right second flue 19 are provided with tail flue gas baffles 8 for adjusting the flue gas flow of the two flues.
Fifth embodiment: the present embodiment will be described with reference to fig. 1, in which a T-shaped arrangement is provided for a double reheat boiler with opposed firing, and the burner 12 is a cyclone burner. Three layers of cyclone burners are arranged on the two sides of the water cooling wall respectively. Other structural connection relationships are the same as those of the second embodiment.
Specific embodiment six: describing the embodiment with reference to fig. 1, the steam outlet of the steam-water separator 13 of the T-shaped arranged opposed firing double reheat boiler provided in the embodiment is communicated with the ultrahigh pressure cylinder of the steam turbine through the low temperature superheater 6, the screen superheater 2 and the high temperature superheater 3; the turbine ultrahigh pressure cylinder is communicated with the turbine high pressure cylinder through a primary reheating low temperature reheater 5 and a primary reheating high temperature reheater 4; the turbine high-pressure cylinder is communicated with the turbine medium-pressure cylinder through the double-reheat low-temperature reheater 11 and the double-reheat high-temperature reheater 10. Other structural connection relationships are the same as those of the second embodiment.
Seventh embodiment: describing the present embodiment with reference to fig. 1, a T-shaped arrangement of the present embodiment is provided for a double reheat boiler of the opposite firing, which further includes two air preheaters 9; an air preheater 9 is arranged at the bottom end of the left vertical flue, and an air preheater 9 is arranged at the bottom end of the right vertical flue. Other structural connection relationships are the same as those of the second embodiment.
Principle of operation
The boiler water supply enters the water-cooled wall through the coal economizer 7 in the left and right side flue, enters the water-cooled wall outlet header through the spiral pipe ring water-cooled wall and the vertical pipe ring water-cooled wall, is led into the steam-water separator 13 through the connecting pipe, the working medium at the outlet of the steam-water separator 13 is led into the ceiling pipe inlet header through the connecting pipe, enters the low-temperature superheater 6 after passing through the ceiling pipe and the tail wall-covering system, passes through the screen-type superheater 2 and the high-temperature superheater 3, and is finally sent to the turbine ultrahigh pressure cylinder through the main steam pipeline. Exhaust steam of the turbine ultrahigh pressure cylinder enters a primary reheating inlet pipeline in a left flue of the boiler, and is sent to the turbine ultrahigh pressure cylinder through a pipeline after passing through a primary reheating low-temperature reheater 5 and a primary reheating high-temperature reheater 4. The exhaust steam of the high-pressure cylinder enters a secondary reheating inlet pipeline in a flue at the right side of the boiler, and is sent to the medium-pressure cylinder of the steam turbine through the pipeline after passing through the secondary reheating low-temperature reheater 11 and the secondary reheating high-temperature reheater 10.

Claims (7)

1. A T-shaped arranged opposed firing double reheat boiler, characterized by: the device comprises a hearth (1), two screen superheaters (2), two high-temperature superheaters (3), a primary reheating high-temperature reheater (4), a primary reheating low-temperature reheater (5), two low-temperature superheaters (6), two coal economizers (7), two air preheaters (9), a secondary reheating high-temperature reheater (10), a secondary reheating low-temperature reheater (11), a steam-water separator (13), a water storage tank (14), a recirculation pump (15) and a plurality of burners (12); the boiler furnace (1) is surrounded by the water-cooled wall, the radiation area at the top of the boiler furnace (1) is provided with two screen superheaters (2), the flame folding angle at two sides at the top of the boiler furnace (1) is provided with a high-temperature superheater (3), a single reheating high-temperature reheater (4) is arranged in a horizontal flue at the left side of the top of the boiler furnace (1), a single reheating low-temperature reheater (5), a low-temperature superheater (6) and a coal economizer (7) are arranged in a vertical flue at the left side of the boiler furnace (1), a secondary reheating high-temperature reheater (10) is arranged in a horizontal flue at the right side of the boiler furnace (1), a secondary reheating low-temperature reheater (11), a low-temperature superheater (6) and a coal economizer (7) are arranged in a vertical flue at the right side of the boiler furnace (1), steam-water separator (13) steam outlets are communicated with an upper inlet header, and steam-water separator (13) water outlets are sequentially communicated with a water storage tank (14) and a recirculation pump (15).
2. A T-arrangement opposed firing double reheat boiler as set forth in claim 1, wherein: the left tail vertical flue and the right vertical flue on the hearth (1) are double flues.
3. A T-arrangement opposed firing double reheat boiler as set forth in claim 1, wherein: the low-temperature reheating device further comprises a left first flue (16), a left second flue (17), a right first flue (18) and a right second flue (19), wherein the primary reheating low-temperature reheater (5) is arranged in the left first flue (16), the secondary reheating low-temperature reheater (11) is arranged in the right first flue (18), one low-temperature superheater (6) is arranged in the left second flue (17), the other low-temperature superheater (6) is arranged in the right second flue (19), and a coal economizer (7) is arranged below each low-temperature superheater (6).
4. A T-arrangement opposed firing double reheat boiler as set forth in claim 1, wherein: it also comprises two tail flue gas baffles (8); the bottom of the left first flue (16) and the bottom of the left second flue (17) are provided with a tail smoke baffle (8), and the bottom of the right first flue (18) and the bottom of the right second flue (19) are provided with a tail smoke baffle (8).
5. A T-arrangement opposed firing double reheat boiler as set forth in claim 1, wherein: the burner (12) is a swirl burner.
6. A T-arrangement opposed firing double reheat boiler as set forth in claim 1, wherein: the steam outlet of the steam-water separator (13) is communicated with the ultrahigh pressure cylinder of the steam turbine through the low-temperature superheater (6), the screen superheater (2) and the high-temperature superheater (3); the turbine ultrahigh pressure cylinder is communicated with the turbine high pressure cylinder through a primary reheating low temperature reheater (5) and a primary reheating high temperature reheater (4); the turbine high-pressure cylinder is communicated with the turbine intermediate-pressure cylinder through the double-reheat low-temperature reheater (11) and the double-reheat high-temperature reheater (10).
7. A T-arrangement opposed firing double reheat boiler as set forth in claim 1, wherein: it also comprises two air preheaters (9); an air preheater (9) is arranged at the bottom end of the left vertical flue, and an air preheater (9) is arranged at the bottom end of the right vertical flue.
CN202211617666.2A 2022-12-15 2022-12-15 T-shaped arranged opposite-firing secondary reheating boiler Pending CN116164270A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211617666.2A CN116164270A (en) 2022-12-15 2022-12-15 T-shaped arranged opposite-firing secondary reheating boiler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211617666.2A CN116164270A (en) 2022-12-15 2022-12-15 T-shaped arranged opposite-firing secondary reheating boiler

Publications (1)

Publication Number Publication Date
CN116164270A true CN116164270A (en) 2023-05-26

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Application Number Title Priority Date Filing Date
CN202211617666.2A Pending CN116164270A (en) 2022-12-15 2022-12-15 T-shaped arranged opposite-firing secondary reheating boiler

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