CN114110559A - Smoke baffle arrangement structure of double reheat boiler and reheat steam temperature control method - Google Patents
Smoke baffle arrangement structure of double reheat boiler and reheat steam temperature control method Download PDFInfo
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- CN114110559A CN114110559A CN202111343045.5A CN202111343045A CN114110559A CN 114110559 A CN114110559 A CN 114110559A CN 202111343045 A CN202111343045 A CN 202111343045A CN 114110559 A CN114110559 A CN 114110559A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G1/00—Steam superheating characterised by heating method
- F22G1/02—Steam superheating characterised by heating method with heat supply by hot flue gases from the furnace of the steam boiler
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/06—Controlling superheat temperature by recirculating flue gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/20—Controlling superheat temperature by combined controlling procedures
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Abstract
The invention discloses a smoke baffle plate arrangement structure of a secondary reheating boiler and a reheating steam temperature control method, wherein a tail flue of the secondary reheating boiler is divided into three mutually independent and parallel flues which are respectively a primary low-secondary flue, a secondary low-secondary flue and a low-pass flue; a primary low re-flue baffle is arranged at an outlet of the primary low re-flue, and a secondary low re-flue baffle is arranged at an outlet of the secondary low re-flue; the primary low re-flue and the secondary low re-flue are converged at the outlet to form a converging flue, and a low re-main flue gas baffle is arranged at the outlet of the converging flue at the downstream of the primary low re-flue baffle and the secondary low re-flue baffle; and a low-pass flue gas baffle is arranged at the outlet of the low-pass flue. According to the invention, the low-secondary main flue gas baffle is added, so that the opening degree of the low-secondary main flue gas baffle tracks the average value of the steam temperature of the primary high secondary outlet and the secondary high secondary outlet, the original three-parameter coupling regulation problem is decoupled into two groups of double-parameter regulation problems, the operation difficulty of the control system is reduced, and the response and convergence speed of the control system are improved.
Description
Technical Field
The invention belongs to the technical field of power station boilers, and particularly relates to a smoke baffle arrangement structure of a tail three-flue double-reheating boiler and a reheating steam temperature control method.
Background
In the existing double reheating boiler with three flues arranged at the tail part, three flues are usually arranged at the tail part, three heating surfaces of primary low reheating, secondary low reheating and low reheating are respectively arranged in the three flues, and a group of flue gas baffles are respectively arranged at the outlets of the three flues. The three groups of flue gas baffles usually work independently, and the opening of the baffles is adjusted to change the flue gas amount so that the temperature of the primary reheat steam and the temperature of the secondary reheat steam reach set values. In practical engineering application, the three groups of flue gas baffles track two target values, namely a primary high re-outlet temperature and a secondary high re-outlet temperature, wherein the flue gas flow of the other two paths of flues can be simultaneously influenced by the opening change of one baffle, so that the two tracked target values are always in a coupling change state. The operating conditions of the set which is put into operation also show that the three baffles have unclear temperature regulation logics, have large mutual influence and are difficult to quickly converge to a stable state, and in order to ensure that the reheated steam temperature reaches the standard, a water-spraying temperature-reducing mode is often adopted to perform auxiliary regulation in the process that the reheated steam temperature reaches the stable state, so that the power generation efficiency of a power plant is reduced. In order to improve the regulation speed of the two-stage reheating steam temperature and improve the economical efficiency of a power plant, a steam temperature control method with more excellent regulation performance needs to be found.
Disclosure of Invention
The invention aims to: aiming at the existing problems, the flue gas baffle plate arrangement structure of the tail three-flue secondary reheating boiler and the reheating steam temperature control method can be used for decoupling the flue gas volume of the three-flue to a certain extent, reducing the control difficulty of the two-stage reheating steam temperature and improving the controlled steam temperature convergence speed.
The invention is realized by the following technical scheme: the utility model provides a flue gas baffle arrangement structure of double reheat boiler which characterized in that: the tail flue of the secondary reheating boiler is divided into three mutually independent and parallel flues which are respectively a primary low re-flue, a secondary low re-flue and a low cross flue;
a primary low re-flue baffle is arranged at an outlet of the primary low re-flue, a secondary low re-flue baffle is arranged at an outlet of the secondary low re-flue, and the primary low re-flue baffle and the secondary low re-flue baffle are matched with each other to adjust the distribution of the amount of flue gas between two stages of low re-flues;
the primary low re-flue and the secondary low re-flue are converged at an outlet to form a converging flue, a low re-main flue gas baffle is arranged at the outlet of the converging flue at the downstream of the primary low re-flue baffle and the secondary low re-flue baffle, and the low re-main flue gas baffle is used for controlling the total flue gas amount of the two paths of low re-flues;
and a low-smoke-passing baffle is arranged at the outlet of the low-smoke-passing flue, and the low-smoke-passing baffle and the low-smoke-passing main baffle are matched with each other to control the distribution of the low-smoke-passing and low-smoke-passing quantities.
According to the smoke baffle plate arrangement structure of the double reheat boiler, the section of the outlet of the converging flue is of a necking structure.
According to the smoke baffle arrangement structure of the double reheat boiler, the sum of the opening degrees of the primary low re-flue baffle and the secondary low re-flue baffle is 100-120%.
According to the smoke baffle arrangement structure of the double reheat boiler, the sum of the opening degrees of the low main smoke baffle and the low flue gas passing baffle is 100-120%.
The three mutually independent and parallel flues of the smoke baffle arrangement structure of the double reheating boiler are respectively a tail front flue, a tail middle flue and a tail rear flue from the front of the boiler to the rear.
According to the smoke baffle arrangement structure of the secondary reheating boiler, the primary low-temperature reheater, the front economizer and the primary low-secondary smoke baffle are sequentially arranged in the front tail flue along the smoke flowing direction, the secondary low-temperature reheater, the middle economizer and the secondary low-secondary smoke baffle are sequentially arranged in the middle tail flue along the smoke flowing direction, and the low-temperature superheater, the rear economizer and the low-pass smoke baffle are sequentially arranged in the rear tail flue along the smoke flowing direction.
A reheat steam temperature control method of a smoke baffle arrangement structure of a double reheat boiler is characterized in that: during steam temperature adjustment, the opening degree of the low-secondary main flue gas baffle tracks the average steam temperature of the primary high secondary outlet and the average steam temperature of the secondary high secondary outlet, the opening degree of the low-secondary main flue gas baffle tracks the opening degree of the low-secondary main flue gas baffle, and the average steam temperature of the two-stage high secondary outlet reaches a set value by matching adjustment of the distribution of the amount of flue gas between the low secondary outlet and the low secondary outlet; the opening degrees of the primary low re-outlet and secondary low re-outlet flue gas baffles track the deviation between the primary high re-outlet steam temperature and the secondary high re-outlet steam temperature and the average steam temperature of the two-stage high re-outlet respectively, and the deviation is eliminated by adjusting the flue gas amount distribution between the two-stage low re-outlets in a matching manner, so that the steam temperatures of the two-stage high re-outlet are consistent.
According to the reheating steam temperature control method, the target values of the primary high re-outlet steam temperature and the secondary high re-outlet steam temperature are set to be dead zones of 3-5 ℃.
According to the reheat steam temperature control method, the opening degree of the secondary low re-flue damper directly tracks the opening degree of the primary low re-flue damper, and the sum of the opening degrees of the two dampers is set to be 100-120%.
According to the reheat steam temperature control method, the opening degree of the low-smoke-passing baffle directly tracks the opening degree of the low-main-smoke-passing baffle, and the sum of the opening degrees of the two baffles is set to be 100-120%.
According to the invention, the original three-parameter coupling coordination regulation problem is decoupled into two groups of two-parameter regulation problems by adding a group of low-secondary main flue gas baffles and enabling the opening degree of the low-secondary main flue gas baffles to track the average value of the primary high secondary outlet steam temperature and the secondary high secondary outlet steam temperature, so that the operation difficulty of the control system is reduced, and the response and convergence speed of the control system is improved.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a schematic control diagram of the low-smoke-in-main-smoke baffle and the low-smoke-in-cross baffle in the invention.
FIG. 3 is a control schematic diagram of the coordinated linkage of the primary low re-flue damper and the secondary low re-flue damper in the present invention.
In the figure: the device comprises a primary low re-flue baffle 1, a secondary low re-flue baffle 2, a low over-flue baffle 3, a low re-main flue baffle 4, a tail front flue 5, a tail middle flue 6, a tail rear flue 7, a primary low-temperature reheater 8, a front economizer 9, a secondary low-temperature reheater 10, a middle economizer 11, a low-temperature superheater 12, a rear economizer 13, a tail flue 14 and a converging flue 15.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Example 1:
as shown in fig. 1, a smoke baffle arrangement structure of a tail three-flue double reheat boiler, a tail flue 14 of the double reheat boiler is divided into three mutually independent and parallel flues by a wrapping wall, the flues are respectively a primary low secondary flue, a secondary low secondary flue and a low secondary flue, and the arrangement sequence of the flues is not required, namely the arrangement sequence of heating surfaces in the three flues can be changed into secondary low secondary, primary low secondary, low secondary or low secondary, primary low secondary, secondary low secondary and primary low secondary from front to back. In this embodiment, the three mutually independent and parallel flues are respectively a tail front flue 5, a tail middle flue 6 and a tail rear flue 7 from the front of the furnace to the rear, i.e. the primary low re-flue is the tail front flue 5, the secondary low re-flue is the tail middle flue 6 and the low over flue is the tail rear flue 7.
Specifically, a primary low-temperature reheater 8, a front economizer 9 and a primary low-smoke baffle 1 are sequentially arranged in the tail front flue 5 along the smoke flowing direction, a secondary low-temperature reheater 10, a middle economizer 11 and a secondary low-smoke baffle 2 are sequentially arranged in the tail middle flue 6 along the smoke flowing direction, and a low-temperature superheater 12, a rear economizer 13 and a low-smoke baffle 3 are sequentially arranged in the tail rear flue 7 along the smoke flowing direction. The primary low reburning flue baffle 1 arranged at the outlet of the primary low reburning flue and the secondary low reburning flue baffle 2 arranged at the outlet of the secondary low reburning flue are matched with each other to adjust the flue gas amount distribution between the two stages of low reburning, namely, the secondary low reburning flue baffle is responsible for adjusting the temperature deviation of the two stages of high reburning, and the temperatures of the two stages of high reburning flues are consistent by eliminating the deviation; the tail front flue 5 and the tail middle flue 6 are converged at outlets to form a converging flue 15, a low-smoke-remaking baffle 4 is arranged at the outlet of the converging flue 15 at the downstream of the tail front flue 5 and the tail middle flue 6, the low-smoke-remaking baffle 4 is used for controlling the total smoke volume of the two low-smoke remakers, and the section of the outlet of the converging flue 15 is of a necking structure so as to increase the resistance of the low-smoke-remaking baffle and improve the control effect of the low-smoke-remaking baffle on the total smoke volume of the two low-smoke remakers; and a low-pass flue gas baffle 3 is arranged at the outlet of the low-pass flue, and the low-pass flue gas baffle 3 and the low-pass main flue gas baffle 4 are matched with each other to control the distribution of the low-pass and low-pass flue gas quantities, so that the average steam temperature of a two-stage high-pass secondary outlet reaches a set value.
Specifically, the sum of the opening degrees of the primary low re-flue baffle 1 and the secondary low re-flue baffle 2 is 100-120%; the sum of the opening degrees of the low-smoke-gas-passing baffle 4 and the low-smoke-gas-passing baffle 3 is 100-120%.
In addition to the original flue gas baffles of the three flues, a group of low secondary main flue gas baffles are additionally arranged at the downstream of the primary low secondary and secondary low secondary flue gas baffles. The low-smoke main baffle controls the total smoke volume of the two low-smoke flues, controls the distribution of the low-smoke volume and the low-smoke volume, controls the distribution of the two low-smoke volumes by matching the primary low-smoke baffle and the secondary low-smoke baffle, and controls the distribution of the two low-smoke volumes, thereby realizing the decoupling of the smoke volumes of the three groups of flues.
Example 2:
a reheat steam temperature control method for a smoke baffle arrangement structure of a tail three-flue double reheat boiler specifically comprises the following steps: during steam temperature adjustment, as shown in fig. 2, the opening degree of the low-pass flue gas damper tracks the average steam temperature of the primary high-pass outlet and the secondary high-pass outlet, the opening degree of the low-pass flue gas damper tracks the opening degree of the low-pass flue gas damper, the sum of the opening degrees of the two dampers is set to be 100% -120%, and the distribution of the amount of flue gas between the low-pass outlet and the low-pass outlet is adjusted in a matching manner, so that the average steam temperature of the two-stage high-pass outlet reaches a set value. Specifically, if the average steam temperature is higher than the set value, the opening degree of the baffle is turned off, and the lower-side baffle is automatically turned on (because the sum of the opening degrees of the two baffles is kept unchanged) until the actual average steam temperature reaches the set steam temperature.
As shown in fig. 3, the opening of the primary low re-outlet and secondary low re-outlet gas baffles tracks the deviation between the primary high re-outlet gas temperature and the secondary high re-outlet gas temperature and the average gas temperature of the two-stage high re-outlet respectively, and the deviation is eliminated by adjusting the gas flow distribution between the two-stage low re-outlets, so that the two-stage high re-outlet gas temperatures are consistent, wherein the target values of the primary high re-outlet gas temperature and the secondary high re-outlet gas temperature are set to be a dead zone of 3-5 ℃ to improve the convergence rate of the opening of the baffles. Specifically, the opening degree of the secondary low re-flue damper directly tracks the opening degree of the primary low re-flue damper, and the sum of the opening degrees of the two dampers is set to be 100-120%. When the temperature control device is in operation, an instruction can be given, when the deviation between the primary high regasification temperature and the secondary high regasification temperature is greater than a fixed value, the two baffles are actuated, for example, if the deviation is less than 5 ℃, the baffles are not actuated, and if the deviation is greater than 5 ℃, the primary low regasification and the secondary low regasification are actuated simultaneously (the high temperature side is closed small, the low temperature side is opened large, and the sum of the opening degrees of the two baffles is kept unchanged) until the deviation is less than 5 ℃.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. Flue gas baffle arrangement structure of double reheat boiler, its characterized in that: the tail flue (14) of the secondary reheating boiler is divided into three mutually independent and parallel flues which are respectively a primary low re-flue, a secondary low re-flue and a low pass flue;
a primary low re-flue baffle (1) is arranged at an outlet of the primary low re-flue, a secondary low re-flue baffle (2) is arranged at an outlet of the secondary low re-flue, and the primary low re-flue baffle (1) and the secondary low re-flue baffle (2) are mutually matched for adjusting the flue gas volume distribution between two stages of low re-flues;
the primary low re-flue and the secondary low re-flue are converged at an outlet to form a converging flue (15), a low re-main flue gas baffle (4) is arranged at the outlet of the converging flue (15) at the downstream of the primary low re-flue baffle (1) and the secondary low re-flue baffle (2), and the low re-main flue gas baffle (4) is used for controlling the total flue gas amount of the two paths of low re-flues;
and a low-smoke-passing baffle (3) is arranged at the outlet of the low-smoke-passing flue, and the low-smoke-passing baffle (3) and the low-smoke-passing main baffle (4) are matched with each other to control the distribution of the low-smoke-passing and low-smoke-passing quantities.
2. The flue gas baffle arrangement of a double reheat boiler of claim 1, wherein: the cross section of the outlet of the converging flue (15) is of a necking structure.
3. The flue gas baffle arrangement of a double reheat boiler of claim 1, wherein: the sum of the opening degrees of the primary low re-flue baffle (1) and the secondary low re-flue baffle (2) is 100-120%.
4. The flue gas baffle arrangement of a double reheat boiler of claim 1, wherein: the sum of the opening degrees of the low-smoke-second main smoke baffle (4) and the low-smoke-passing baffle (3) is 100-120%.
5. The flue gas baffle arrangement of a double reheat boiler of claim 1, wherein: the three mutually independent and parallel flues are respectively a tail front flue (5), a tail middle flue (6) and a tail rear flue (7) from the front of the furnace to the rear.
6. The flue gas baffle arrangement of a double reheat boiler of claim 5, wherein: arrange once low temperature reheater (8), preceding economizer (9) and once low flue gas baffle (1) again along flue gas flow direction in proper order in afterbody front flue (5), secondary low temperature reheater (10), well economizer (11) and secondary low flue gas baffle (2) again are arranged in proper order along flue gas flow direction in afterbody middle flue (6), arrange low temperature superheater (12), back economizer (13) and low flue gas baffle (3) in proper order along flue gas flow direction in afterbody back flue (7).
7. A reheat steam temperature control method of a flue gas baffle arrangement structure of a double reheat boiler according to any one of claims 1 to 6, wherein: during steam temperature adjustment, the opening degree of the low-secondary main flue gas baffle tracks the average steam temperature of the primary high secondary outlet and the average steam temperature of the secondary high secondary outlet, the opening degree of the low-secondary main flue gas baffle tracks the opening degree of the low-secondary main flue gas baffle, and the average steam temperature of the two-stage high secondary outlet reaches a set value by matching adjustment of the distribution of the amount of flue gas between the low secondary outlet and the low secondary outlet; the opening degrees of the primary low re-outlet and secondary low re-outlet flue gas baffles track the deviation between the primary high re-outlet steam temperature and the secondary high re-outlet steam temperature and the average steam temperature of the two-stage high re-outlet respectively, and the deviation is eliminated by adjusting the flue gas amount distribution between the two-stage low re-outlets in a matching manner, so that the steam temperatures of the two-stage high re-outlet are consistent.
8. The reheat steam temperature control method as set forth in claim 7, wherein: the target values of the primary high re-outlet steam temperature and the secondary high re-outlet steam temperature are set to be dead zones of 3-5 ℃.
9. The reheat steam temperature control method as set forth in claim 7, wherein: the opening degree of the secondary low re-flue baffle directly tracks the opening degree of the primary low re-flue baffle, and the sum of the opening degrees of the two baffles is set to be 100-120%.
10. The reheat steam temperature control method as set forth in claim 7, wherein: the opening degree of the low-smoke-passing baffle directly tracks the opening degree of the low-smoke-passing baffle, and the sum of the opening degrees of the two baffles is set to be 100-120%.
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| CN202111343045.5A CN114110559B (en) | 2021-11-12 | 2021-11-12 | Flue gas baffle arrangement structure of secondary reheating boiler and reheat steam temperature control method |
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