CN114110559B - Flue gas baffle arrangement structure of secondary reheating boiler and reheat steam temperature control method - Google Patents
Flue gas baffle arrangement structure of secondary reheating boiler and reheat steam temperature control method Download PDFInfo
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- CN114110559B CN114110559B CN202111343045.5A CN202111343045A CN114110559B CN 114110559 B CN114110559 B CN 114110559B CN 202111343045 A CN202111343045 A CN 202111343045A CN 114110559 B CN114110559 B CN 114110559B
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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 flue gas baffle arrangement structure and a reheat steam temperature control method of a secondary reheat boiler.A secondary reheat boiler tail flue is divided into three mutually independent and parallel flues, namely a primary low-pressure flue, a secondary low-pressure flue and a low-pressure flue; a primary low-pressure flue baffle is arranged at the outlet of the primary low-pressure flue, and a secondary low-pressure flue baffle is arranged at the outlet of the secondary low-pressure flue; the primary low-pressure flue and the secondary low-pressure flue are converged at the outlet to form a converged flue, and a low-pressure main flue gas baffle is arranged at the outlet of the converged flue at the downstream of the primary low-pressure flue baffle and the secondary low-pressure flue baffle; a low flue gas passing baffle is arranged at the outlet of the low flue gas passing channel. According to the invention, the opening of the low-recombination main flue gas baffle is enabled to track the average value of the primary high-recombination and secondary high-recombination outlet steam temperature, the original three-parameter coupling adjustment problem is decoupled into two groups of double-parameter adjustment problems, the operation difficulty of a 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 secondary reheating boiler and a reheat steam temperature control method.
Background
The tail of the existing double reheat boiler with three tail flues is generally provided with three flues, three heating surfaces of which the primary low-temperature heating surface, the secondary low-temperature heating surface and the secondary low-temperature heating surface 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 each baffle is adjusted to change the flue gas quantity so that the temperature of the primary reheating steam and the temperature of the secondary reheating steam reach the set value. 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 change of the opening degree of one baffle can influence the flue gas flow of the other two paths of flues at the same time, so that the tracked two target values are always in a coupling change state. The running state of the put-into-service unit also shows that the three-baffle temperature regulating logic is unclear, the mutual influence is large, the quick convergence to a steady state is difficult, in order to ensure that the reheat steam temperature reaches the standard, the auxiliary regulation is often carried out in a water spraying temperature reducing mode in the process that the reheat steam temperature reaches the steady state, and 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 sought.
Disclosure of Invention
The invention aims at: aiming at the problems, the flue gas baffle arrangement structure and the reheat steam temperature control method of the tail three-flue secondary reheat boiler can release the coupling between the flue gas volumes of three channels to a certain extent, reduce the control difficulty of two-stage reheat steam temperature and improve the convergence speed of the controlled steam temperature.
The invention is realized by the following technical scheme: a flue gas baffle arrangement structure of a double reheat boiler, characterized in that: the tail flue of the secondary reheating boiler is divided into three mutually independent and parallel flues, namely a primary low-pressure flue, a secondary low-pressure flue and a low-pressure flue;
a primary low-re-flue gas baffle is arranged at the outlet of the primary low-re-flue, a secondary low-re-flue gas baffle is arranged at the outlet of the secondary low-re-flue, and the primary low-re-flue gas baffle and the secondary low-re-flue gas baffle are mutually matched for adjusting the flue gas distribution between two stages of low re-flue gas;
the primary low-recombination flue and the secondary low-recombination flue are converged at the outlet to form a converged flue, a low-recombination main flue baffle is arranged at the outlet of the converged flue at the downstream of the primary low-recombination flue baffle and the secondary low-recombination flue, and the low-recombination main flue baffle is used for controlling the total flue gas quantity of the two paths of low-recombination flues;
and a low-pass flue gas baffle is arranged at the outlet of the low-pass flue, and the low-pass flue gas baffle and the low-pass main flue gas baffle are mutually matched to control low-pass and low-pass flue gas distribution.
The cross section of the outlet of the converging flue is of a necking structure.
The flue gas baffle arrangement structure of the secondary reheating boiler has the advantages that the sum of the opening degrees of the primary low-re-flue gas baffle and the secondary low-re-flue gas baffle is 100% -120%.
The flue gas baffle arrangement structure of the secondary reheating boiler has the advantages that the sum of the opening degrees of the low-secondary main flue gas baffle and the low-pass flue gas baffle is 100% -120%.
The three mutually independent and parallel flues of the flue gas baffle arrangement structure of the secondary reheating boiler are respectively a tail front flue, a tail middle flue and a tail rear flue from the front to the back of the boiler.
The invention discloses a smoke baffle arrangement structure of a secondary reheating boiler, which is characterized in that a primary low-temperature reheater, a front economizer and a primary low-temperature secondary smoke baffle are sequentially arranged in a tail front flue along the smoke flow direction, a secondary low-temperature reheater, a middle economizer and a secondary low-temperature secondary smoke baffle are sequentially arranged in a tail middle flue along the smoke flow direction, and a low-temperature superheater, a rear economizer and a low-temperature flue baffle are sequentially arranged in a tail rear flue along the smoke flow direction.
A reheat steam temperature control method of a flue gas baffle plate arrangement structure of a secondary reheat boiler is characterized by comprising the following steps of: when the steam temperature is regulated, the opening degree of the low-recombination main flue gas baffle tracks the average steam temperature of the primary high-recombination and secondary high-recombination outlets, the opening degree of the low-recombination main flue gas baffle tracks the opening degree of the low-recombination main flue gas baffle, and the distribution of the flue gas quantity between the low recombination and the low recombination is matched and regulated so that the average steam temperature of the two-stage recombination outlets reaches a set value; the opening of the primary low-re-outlet and secondary low-re-outlet flue gas baffle is respectively tracked to obtain the deviation of the primary high-re-outlet flue gas temperature and the secondary high-re-outlet flue gas temperature, and the flue gas distribution between the two stages of low re-outlet flue gas temperature is matched with the regulation of the flue gas distribution between the two stages of low re-outlet flue gas temperature, so that the deviation is eliminated, and the steam temperatures of the two stages of high re-outlet flue gas temperature are consistent.
The reheating steam temperature control method of the invention sets a dead zone of 3-5 ℃ for the target value of the primary high re-outlet steam temperature and the secondary high re-outlet steam temperature.
According to the reheat steam temperature control method, the opening of the secondary low-flue gas baffle is directly tracked to the opening of the primary low-flue gas baffle, and the sum of the opening of the two baffles is set to be 100% -120%.
According to the reheat steam temperature control method, the opening of the low-pass flue gas baffle is directly tracked to the opening of the low-pass main flue gas baffle, and the sum of the opening of the two baffles is set to be 100% -120%.
According to the invention, by adding a group of low-recombination main flue gas baffles and enabling the opening degree of the low-recombination main flue gas baffles to track the average value of the primary high-recombination and secondary high-recombination outlet steam temperature, the original three-parameter coupling coordination adjustment problem is decoupled into two groups of double-parameter adjustment problems, the operation difficulty of a control system is reduced, and the response and convergence speeds of the control system are improved.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a schematic control diagram of the cooperation linkage of the low-recombination main flue gas baffle and the low-passing flue gas baffle in the invention.
FIG. 3 is a schematic control diagram of the cooperation linkage of the primary low-re-smoke baffle and the secondary low-re-smoke baffle in the invention.
In the figure: 1 is a primary low-temperature re-flue gas baffle, 2 is a secondary low-temperature re-flue gas baffle, 3 is a low-pass flue gas baffle, 4 is a low-temperature re-main flue gas baffle, 5 is a tail front flue, 6 is a tail middle flue, 7 is a tail rear flue, 8 is a primary low-temperature reheater, 9 is a front economizer, 10 is a secondary low-temperature reheater, 11 is a middle economizer, 12 is a low-temperature superheater, 13 is a rear economizer, 14 is a tail flue, and 15 is a converging flue.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the 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 invention, as 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 made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
Example 1:
as shown in fig. 1, in the arrangement structure of the flue gas baffle of the tail three-flue secondary reheating boiler, the tail flue 14 of the secondary reheating boiler is divided into three mutually independent and parallel flues by a wrapping wall, namely a primary low-re-flue, a secondary low-re-flue and a low-pass 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 a secondary low-re-flue, a primary low-re-flue, a low-pass flue or a low-pass flue, a primary low-re-flue, a secondary low-re-flue or a low-pass flue, and a secondary low-re-flue from front to back. In this embodiment, the three mutually independent and parallel flues are, from the front to the back of the furnace, a tail front flue 5, a tail middle flue 6 and a tail rear flue 7, that is, 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-pass flue is the tail rear flue 7.
Specifically, a primary low-temperature reheater 8, a front economizer 9 and a primary low-temperature re-flue gas baffle 1 are sequentially arranged in the tail front flue 5 along the flue gas flow direction, a secondary low-temperature reheater 10, a middle economizer 11 and a secondary low-temperature re-flue gas baffle 2 are sequentially arranged in the tail middle flue 6 along the flue gas flow direction, and a low-temperature superheater 12, a rear economizer 13 and a low-temperature flue gas baffle 3 are sequentially arranged in the tail rear flue 7 along the flue gas flow direction. The primary low-re-flue gas baffle 1 arranged at the outlet of the primary low-re-flue and the secondary low-re-flue gas baffle 2 arranged at the outlet of the secondary low-re-flue are matched with each other to adjust the flue gas distribution between the two stages of low re-flue gas, namely, the two stages of low re-flue gas temperature deviation is adjusted, and the two stages of high re-outlet steam temperatures are consistent by eliminating the deviation; the tail front flue 5 and the tail middle flue 6 are converged at the outlet to form a converged flue 15, a low-recombination main flue gas baffle 4 is arranged at the outlet of the converged flue 15 at the downstream of the tail front flue 5 and the tail middle flue 6, the low-recombination main flue gas baffle 4 is used for controlling the total flue gas quantity of two paths of low-recombination flues, and the section of the outlet of the converged flue 15 is in a necking structure so as to increase the resistance of the low-recombination main flue gas baffle and improve the control effect of the low-recombination main flue gas baffle on the total flue gas quantity of the two paths of low-recombination flues; the low flue gas passing baffle 3 is arranged at the outlet of the low flue gas passing channel, and the low flue gas passing baffle 3 and the low secondary main flue gas baffle 4 are mutually matched to control low secondary flue gas flow distribution and low secondary flue gas flow distribution, so that the average steam temperature of the two-stage secondary outlet reaches a set value.
Specifically, the sum of the opening degrees of the primary low-re-smoke baffle 1 and the secondary low-re-smoke baffle 2 is 100% -120%; the sum of the opening degrees of the low-recombination main smoke baffle 4 and the low-passing smoke baffle 3 is 100% -120%.
In the invention, besides the original smoke baffles of the three flues, a group of low-recombination main smoke baffles are additionally arranged at the downstream of the primary low-recombination baffle and the secondary low-recombination baffle. The low-recombination main flue gas baffle controls the total flue gas quantity of the two paths of low-recombination flues, is matched with the low-recombination flue gas baffle, controls the distribution of the low-recombination flue gas quantity and the low-recombination flue gas quantity, and is matched with the low-recombination flue gas baffle and the low-recombination flue gas baffle for the first time, controls the distribution of the two paths of low-recombination flue gas quantity, thereby realizing the decoupling of the flue gas flow of the three groups of flues.
Example 2:
a reheat steam temperature control method of a smoke baffle plate arrangement structure of a tail three-flue secondary reheat boiler specifically comprises the following steps: when the steam temperature is regulated, as shown in fig. 2, the opening of the low-recombination main flue gas baffle tracks the average steam temperature of the primary high-recombination outlet and the secondary high-recombination outlet, the opening of the low-recombination main flue gas baffle tracks the opening of the low-recombination main flue gas baffle, the sum of the openings of the two baffles is set to be 100-120%, and the distribution of the flue gas quantity between the low-recombination outlet and the low-recombination outlet is matched and regulated, so that the average steam temperature of the two-level recombination outlets reaches a set value. Specifically, if the average steam temperature is higher than the set value, the opening degree of the baffle is closed, and the lower baffle is opened automatically (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 the secondary low-re-outlet flue gas baffle plate respectively track the deviation of the primary high-re-outlet steam temperature and the secondary high-re-outlet steam temperature and the average steam temperature of the two stages, and the flue gas distribution between the two stages is adjusted in a matched manner, so that the deviation is eliminated, and the steam temperatures of the two stages are consistent, wherein the target values of the primary high-re-outlet steam temperature and the secondary high-re-outlet steam temperature are set with dead zones of 3-5 ℃ so as to improve the convergence rate of the opening of the baffle plate. Specifically, the opening of the secondary low-re-flue gas baffle directly tracks the opening of the primary low-re-flue gas baffle, and the sum of the opening of the two baffles is set to be 100% -120%. In operation, an instruction may be given that the two baffles are actuated when the deviation of the primary high and secondary high re-steam temperatures is greater than a fixed value, 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 re-baffle and the secondary low re-baffle are actuated simultaneously (the high temperature side is closed down, the low temperature side is opened up, and the sum of the opening degrees of the two baffles remains unchanged) until the deviation is less than 5 ℃.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (9)
1. The utility model provides a flue gas baffle arrangement structure of secondary reheat boiler which characterized in that: the tail flue (14) of the secondary reheating boiler is divided into three mutually independent and parallel flues, namely a primary low-pressure flue, a secondary low-pressure flue and a low-pressure flue;
a primary low-re-flue gas baffle (1) is arranged at the outlet of the primary low-re-flue, a secondary low-re-flue gas baffle (2) is arranged at the outlet of the secondary low-re-flue, and the primary low-re-flue gas baffle (1) and the secondary low-re-flue gas baffle (2) are mutually matched to adjust the flue gas distribution between two stages of low re-flue gas;
the primary low-pressure flue and the secondary low-pressure flue are converged at the outlet to form a converging flue (15), a low-pressure main flue gas baffle (4) is arranged at the outlet of the converging flue (15) at the downstream of the primary low-pressure flue gas baffle (1) and the secondary low-pressure flue gas baffle (2), and the low-pressure main flue gas baffle (4) is used for controlling the total flue gas quantity of the two paths of low-pressure flue gas flues;
a low flue gas passing baffle (3) is arranged at the outlet of the low flue gas passing channel, and the low flue gas passing baffle (3) and the low secondary main flue gas baffle (4) are mutually matched to control low secondary flue gas flow distribution and low flue gas flow distribution;
when the steam temperature is regulated, the opening degree of the low-recombination main flue gas baffle tracks the average steam temperature of the primary high-recombination and secondary high-recombination outlets, the opening degree of the low-recombination main flue gas baffle tracks the opening degree of the low-recombination main flue gas baffle, and the distribution of the flue gas quantity between the low recombination and the low recombination is matched and regulated so that the average steam temperature of the two-stage recombination outlets reaches a set value; the opening of the primary low-re-outlet and secondary low-re-outlet flue gas baffle is respectively tracked to obtain the deviation of the primary high-re-outlet flue gas temperature and the secondary high-re-outlet flue gas temperature, and the flue gas distribution between the two stages of low re-outlet flue gas temperature is matched with the regulation of the flue gas distribution between the two stages of low re-outlet flue gas temperature, so that the deviation is eliminated, and the steam temperatures of the two stages of high re-outlet flue gas temperature are consistent.
2. The flue gas baffle arrangement of a double reheat boiler according to claim 1, characterized in that: the 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 according to claim 1, characterized in that: the sum of the opening degrees of the primary low-re-smoke baffle (1) and the secondary low-re-smoke baffle (2) is 100% -120%.
4. The flue gas baffle arrangement of a double reheat boiler according to claim 1, characterized in that: the sum of the opening degrees of the low-recombination main flue gas baffle (4) and the low-passing flue gas baffle (3) is 100% -120%.
5. The flue gas baffle arrangement of a double reheat boiler according to claim 1, characterized in that: 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 to the rear of the furnace.
6. The flue gas baffle arrangement of a double reheat boiler as set forth in claim 5, wherein: a low-temperature reheater (8), a front economizer (9) and a low-temperature secondary flue gas baffle (1) are sequentially arranged in the tail front flue (5) along the flue gas flow direction, a secondary low-temperature reheater (10), a middle economizer (11) and a secondary low-temperature secondary flue gas baffle (2) are sequentially arranged in the tail middle flue (6) along the flue gas flow direction, and a low-temperature superheater (12), a rear economizer (13) and a low-temperature flue gas baffle (3) are sequentially arranged in the tail rear flue (7) along the flue gas flow direction.
7. A reheat steam temperature control method of a flue gas damper arrangement structure of a double reheat boiler as defined in any one of claims 1 to 6, characterized in that: the target value of the primary high re-outlet steam temperature and the secondary high re-outlet steam temperature is set with a dead zone of 3-5 ℃.
8. The reheat steam temperature control method as set forth in claim 7, characterized in that: the opening of the secondary low-re-flue gas baffle is directly tracked to the opening of the primary low-re-flue gas baffle, and the sum of the opening of the two baffles is set to be 100% -120%.
9. The reheat steam temperature control method as set forth in claim 7, characterized in that: the opening of the low-pass smoke baffle directly tracks the opening of the low-pass main smoke baffle, and the sum of the opening of the two baffles is set to be 100% -120%.
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