CN114459051A - Treatment system and treatment method for thermal deviation of heated surfaces of boiler furnace and tail flue - Google Patents
Treatment system and treatment method for thermal deviation of heated surfaces of boiler furnace and tail flue Download PDFInfo
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- CN114459051A CN114459051A CN202111329915.3A CN202111329915A CN114459051A CN 114459051 A CN114459051 A CN 114459051A CN 202111329915 A CN202111329915 A CN 202111329915A CN 114459051 A CN114459051 A CN 114459051A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M5/00—Casings; Linings; Walls
- F23M5/08—Cooling thereof; Tube walls
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
- F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
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Abstract
The application discloses a treatment system and a treatment method for thermal deviation of heated surfaces of a boiler furnace and a tail flue, which comprise the following steps: the coal economizer comprises an inlet side and an outlet side, wherein the inlet side is connected with a water supply pipe, the outlet side is connected with a downcomer distribution header, and the downcomer distribution header is connected with a plurality of downcomer cold wall loops through a plurality of water supply pipes; the lower water-cooled wall loop comprises a lower water-cooled wall lower header, a lower water-cooled wall tube panel and a lower water-cooled wall outlet header which are sequentially connected, the lower water-cooled wall lower header comprises a plurality of lower water-cooled wall loops, and the lower water-cooled wall lower headers correspond to the water supply tubes one by one; a water spray pipe is connected to the water supply pipe on the inlet side of the economizer, and a plurality of water spray branch pipes are arranged at the tail end of the water spray pipe so as to adjust the wall temperature of each lower water cooling wall loop; the problem of the thermal deviation of water-cooling wall and afterbody flue heating surface thermal deviation can thoroughly be solved to this application.
Description
Technical Field
The application belongs to the technical field of thermal power station boilers, and particularly relates to a treatment system and a treatment method for thermal deviation of heated surfaces of a boiler furnace and a tail flue.
Background
In order to fully utilize a large amount of anthracite coal in China, the thermal power generation field can adapt to large-scale continuous operation of W-shaped flame boilers of the anthracite coal, so that the problem of combustion of the anthracite coal of power station boilers is solved, and great progress of the thermal power generation industry is promoted. In recent years, with the adjustment of national energy structures, national energy-saving and consumption-reducing policies are coming out one after another, and the requirements of energy-saving and emission-reducing work are continuously in depth. The W flame unit also develops towards the direction of high capacity and high parameter, the parameter is gradually increased from subcritical to supercritical and ultra-supercritical, and the size of the section of the hearth is increased. During medium and low load or start-stop grinding, due to the fact that heat load changes in a short time when the combustor is put into operation and the start-stop grinding machine is started, heat load distribution in the width direction of the lower furnace chamber is uneven, heat load of a region where the burner is put into operation is high, heat load of a region where the burner is withdrawn is low, and steep rise and even over-temperature of the wall temperature of a local or large-area region of a water-cooled wall of the lower furnace chamber are prone to occurring.
The problem of thermal deviation of the water wall is obvious and has large influence in the running unit, so that the problem of thermal deviation of the water wall is firstly solved in order to ensure long-period safe and stable running of the W boiler. However, the prior art is difficult to thoroughly solve the problem of thermal deviation of the water-cooled wall, so that the problem of thermal deviation of the heated surface of the tail flue cannot be solved.
Disclosure of Invention
To above-mentioned problem, this application embodiment provides a treatment system of boiler furnace and afterbody flue heating surface thermal deviation to thoroughly solve the thermal deviation problem of water-cooled wall, and the problem of afterbody flue heating surface thermal deviation, technical scheme is as follows:
the first aspect of this application provides a treatment system that boiler furnace and afterbody flue were heated hot deviation, includes: the coal economizer comprises an inlet side and an outlet side, wherein the inlet side is connected with a water supply pipe, the outlet side is connected with a downcomer distribution header, and the downcomer distribution header is connected with a plurality of downcomer cold wall loops through a plurality of water supply pipes; the lower water-cooled wall loop comprises a lower water-cooled wall lower header, a lower water-cooled wall tube panel and a lower water-cooled wall outlet header which are sequentially connected, the lower water-cooled wall lower header comprises a plurality of lower water-cooled wall loops, and the lower water-cooled wall lower headers correspond to the water supply tubes one by one; the water supply pipe on the inlet side of the economizer is connected with a water spray pipe, the tail end of the water spray pipe is provided with a plurality of water spray branch pipes, and the water spray branch pipes are connected with the water supply pipes in a one-to-one correspondence mode so as to adjust the wall temperature of each lower water cooling wall loop.
For example, in an embodiment of the system for managing thermal deviation of heated surfaces of a boiler furnace and a tail flue, a high-pressure check valve is disposed on each water supply pipe, and an access point of the water spray branch pipe and the water supply pipe is located downstream of the high-pressure check valve, so as to prevent water in the water supply pipe from flowing back to the economizer through the water spray branch pipe.
For example, in one embodiment, in the system for managing thermal deviation of the heating surfaces of the boiler furnace and the tail flue, a high-pressure regulating valve is arranged on each water spray branch pipe to regulate the water spray amount of the water spray branch pipe.
For example, in the system for managing thermal deviation of the heated surfaces of the boiler furnace and the tail flue, provided in one embodiment, water flows enter the lower water-cooled wall lower header, then enter the lower water-cooled wall outlet header through the lower water-cooled wall tube panels, then enter the upper water-cooled wall inlet header through the intermediate mixing header, then enter the upper water-cooled wall outlet header through the upper furnace water-cooled wall tube panels, then enter the steam-water separator inlet tube through the water-cooled wall outlet mixing header, and finally enter the steam-water separator.
For example, in the treatment system for thermal deviation of the heated surfaces of the boiler furnace and the tail flue provided in one embodiment, two steam-water separators arranged at intervals are arranged on one side of the water-cooled wall outlet mixing header, and each steam-water separator is a first steam-water separator and a second steam-water separator, and each steam-water separator introduction pipe comprises a first group of steam-water separator introduction pipes corresponding to the first steam-water separators and a second group of steam-water separator introduction pipes corresponding to the second steam-water separators, wherein one part of the first group of steam-water separator introduction pipes is connected with the first steam-water separator, and the other part of the first group of steam-water separator introduction pipes is connected with the second steam-water separator; and one part of the second group of steam-water separator introducing pipes is connected with the second steam-water separator, and the other part of the second group of steam-water separator introducing pipes is connected with the first steam-water separator, so that the part of the steam-water separator introducing pipes is arranged in a cross way.
For example, in an embodiment of the system for managing thermal deviation of a heated surface of a boiler furnace and a tail flue, the first group of steam-water separator introduction pipes includes two groups, and the two groups are respectively located at two sides of the first steam-water separator, wherein the first group of steam-water separator introduction pipes which are far away from the second steam-water separator are connected with the first steam-water separator, and the first group of steam-water separator introduction pipes which are close to the second steam-water separator are connected with the second steam-water separator; the second group of steam-water separator introducing pipes comprise two groups and are respectively positioned on two sides of the second steam-water separator, wherein one group of the second group of steam-water separator introducing pipes far away from the first steam-water separator is connected with the second steam-water separator, and one group of the second group of steam-water separator introducing pipes close to the first steam-water separator is connected with the first steam-water separator.
For example, in the treatment system for thermal deviation of the heating surfaces of the boiler furnace and the back flue, provided by an embodiment, the first group of steam-water separator inlet pipes include six pipes, each group of three pipes is located on two sides of the first steam-water separator, respectively, where three first group of steam-water separator inlet pipes far away from the second steam-water separator are connected to the first steam-water separator, and three first group of steam-water separator inlet pipes close to the second steam-water separator are connected to the second steam-water separator; the second group of steam-water separator inlet pipes comprise six pipes, each group of the second group of steam-water separator inlet pipes comprises three pipes, the three pipes are respectively positioned at two sides of the second steam-water separator, the three pipes which are far away from the first steam-water separator are connected with the second steam-water separator, and the three pipes which are close to the first steam-water separator are connected with the first steam-water separator.
The second aspect of the application provides a treatment method for a treatment system for thermal deviation of heating surfaces of a boiler furnace and a tail flue, which comprises the following steps: measuring the highest wall temperature and the average wall temperature at the outlet of each lower water-cooling wall loop; comparing the highest wall temperature at the outlet of each lower water-cooling wall loop with a preset wall temperature alarm value; if the highest wall temperature at the outlet of the lower water-cooling wall loop exceeds a preset wall temperature alarm value, opening a high-pressure regulating valve on a water spraying branch pipe of the lower water-cooling wall loop until the highest wall temperature at the outlet of the lower water-cooling wall loop is lower than the wall temperature alarm value; if the highest wall temperature at the outlet of the lower water-cooled wall loop does not exceed the preset wall temperature alarm value, continuing to compare the average wall temperature at the outlet of the lower water-cooled wall loop with the preset wall temperature lower limit value, and if the average wall temperature at the outlet of the lower water-cooled wall loop is lower than the preset wall temperature lower limit value, closing a high-pressure regulating valve on a water spray branch pipe of the lower water-cooled wall loop; until the highest wall temperature at the outlet of each lower water-cooling wall loop is between the preset wall temperature lower limit value and the wall temperature alarm value.
For example, in an embodiment, in the method for managing thermal deviation of the heating surfaces of the boiler furnace and the back flue, the adjustment amount of the high-pressure adjusting valve that is opened or closed each time is a fixed value and is 5% of the maximum flow of the high-pressure adjusting valve.
For example, in one embodiment, the method for managing thermal deviation of heating surfaces of a furnace and a back flue of the boiler is provided, wherein the minimum time interval between two adjacent times of adjustment of the high-pressure adjusting valve on each lower water-cooled wall loop is 20 s.
The system and the method for treating the thermal deviation of the heated surface of the boiler hearth and the tail flue have the advantages that low-temperature feed water in front of the economizer is introduced into the inlet of each lower water-cooling wall header through the water spray pipe and the water spray branch pipe, and the characteristic that the temperature of the feed water in the water spray pipe is slightly lower than the temperature of the water at the outlet of the economizer is utilized to cool a loop with higher wall temperature in a lower water-cooling wall loop, so that the problems of over-temperature and thermal deviation of the lower water-cooling wall are solved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow diagram of a boiler waterwall vapor flow;
FIG. 2 is an enlarged view of section I of FIG. 1;
FIG. 3 is an enlarged view of section II of FIG. 1;
FIG. 4 is a logic diagram of the method for managing the thermal deviation of the heated surfaces of the boiler furnace and the tail flue.
Reference numerals: 1-a downcomer distribution header, 2-an economizer, 3-a lower water wall tube panel, 4-a lower water wall lower header, 5-a water wall intermediate mixing header, 6-a high pressure check valve, 7-a high pressure regulating valve, 8-an upper furnace chamber, 9-a lower furnace chamber, 10-a steam-water separator inlet tube, 11-a water supply tube, 12-a water spray tube, 13-a lower water wall outlet header, 14-an upper water wall inlet header, 15-an upper water wall outlet header, 16-a water wall outlet mixing header, 17-a steam-water separator, 18-a low temperature reheater, 19-a low temperature superheater, 20-an upper furnace chamber water wall tube panel, 21-an inlet side, 22-an outlet side, 23-a water supply tube, 24-a water spray branch tube, 25-a first steam-water separator, 26-a second steam-water separator, 27-a first group of steam-water separator introducing pipes and 28-a second group of steam-water separator introducing pipes.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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 application.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
When a W boiler is in medium and low load or is started and stopped, because the heat load of a combustor part in operation and in short time of starting and stopping the boiler is changed, the heat load distribution along the width direction of a lower hearth is uneven, the heat load of a region for operating a burner is high, the heat load of a region for withdrawing the burner is low, the temperature of the wall of a water cooling wall of the lower hearth in a local or large area region is easy to suddenly rise, even the temperature is over-high, the heat deviation of the water cooling wall of the lower hearth is relieved by a middle mixing header of the water cooling wall, but the steam temperature in the water cooling wall of an upper hearth outlet on the left side and the right side still has larger deviation, and the steam temperature deviation is possibly aggravated after the water cooling wall passes through an upper hearth. At present, the spatial arrangement positions of a water wall outlet header outlet pipe and a steam-water separator inlet pipe of a main operating W boiler upper hearth correspond, namely, steam on the left side of the water wall outlet header enters a left steam-water separator, steam on the right side of the water wall outlet header enters a right steam-water separator, and due to the fact that heat deviation caused by uneven heat absorption of a lower hearth still exists in the outlet of the upper water wall and the steam-water separator, the heat deviation of the outlet of the steam-water separator causes thermal deviation of a ceiling pipe and front and back wrapping walls and even further amplification of the heat deviation. The thermal deviation is accompanied with thermal stress, and the excessive thermal deviation causes the problems of tensile fracture of water wall fins, tensile fracture of water wall tubes, tensile fracture of ceiling tubes, corners of front and rear wrapping walls and side wrapping walls and the like due to the thermal stress, and even causes unplanned shutdown of the unit. The problem of rear wrapping wall pulling crack of the tail part in actual operation is more prominent.
The prior art has conducted intensive studies on the problem of thermal deviation. In conclusion, the research is mainly divided into two directions of a smoke side and a steam side, wherein the smoke side is mainly used for enhancing the monitoring of the smoke temperature of the hearth, better guiding the operation and adjusting the smoke temperature deviation of the hearth and achieving the purpose of relieving the heat deviation of the water-cooled wall; the steam side is mainly used for enhancing the uniformity of steam-water flow distribution, reducing flow deviation and achieving the purpose of relieving the thermal deviation of a furnace water-cooled wall and a tail heating surface. According to the current solution, no matter the steam side and the flue gas side solve the thermal deviation of the water cooled wall and the heated surface at the tail part, certain limitation exists, firstly, the flue gas side has hysteresis and adjustment uncertainty from the monitoring of the flue gas temperature to the combustion adjustment, and the adjustment effect is greatly influenced by the level of operators; secondly, the throttling shrinkage cavity usually arranged on the steam side is easy to scale, wear and even fall off, and the adaptability of the heat load distribution and the steam-water flow distribution in the furnace is poor when the coal quality changes.
In view of the above, the first aspect of the present application provides a system for managing thermal deviation of heating surfaces of a furnace and a back flue of a boiler, as shown in fig. 1-2, including: the coal economizer 2 comprises an inlet side 21 and an outlet side 22, the inlet side 21 is connected with a water supply pipe 23, the outlet side 22 is connected with a downcomer distribution header 1, and the downcomer distribution header 1 is connected with a plurality of downcomer cold wall loops through a plurality of water supply pipes 11; the lower water-cooling wall loop comprises a lower water-cooling wall lower header 4, a lower water-cooling wall pipe screen 3 and a lower water-cooling wall outlet header 13 which are sequentially connected, the lower water-cooling wall lower header 4 comprises a plurality of lower water-cooling wall loops, and the lower water-cooling wall lower headers 4 correspond to the water supply pipes 11 one by one; a water supply pipe 23 on the inlet side 21 of the economizer 2 is connected with a water spray pipe 12, the tail end of the water spray pipe 12 is provided with a plurality of water spray branch pipes 24, and the water spray branch pipes are correspondingly connected with the water supply pipes 11 one by one so as to adjust the wall temperature of each lower water cooling wall loop. According to the embodiment, low-temperature feed water in front of the economizer 2 is introduced into the inlet of each lower water-cooled wall header 4 through the water spray pipe 12 and the water spray branch pipes 24, and a loop with higher wall temperature in the lower water-cooled wall loop is cooled by utilizing the characteristic that the temperature of the feed water in the water spray pipe 12 is slightly lower than the temperature of the water at the outlet of the economizer 2, so that the problems of super temperature and thermal deviation of the lower water-cooled wall are solved.
For example, in an embodiment of the system for managing thermal deviation of the heated surfaces of the boiler furnace and the back flue, as shown in fig. 2, a high-pressure check valve 6 is disposed on each water supply pipe 11, and an access point of the water spray branch pipe 24 and the water supply pipe 11 is located downstream of the high-pressure check valve 6, so as to prevent water in the water supply pipe 11 from flowing back to the economizer 2 through the water spray branch pipe 24.
For example, in the system for managing thermal deviation of the heating surfaces of the boiler furnace and the tail flue according to one embodiment, as shown in fig. 2, a high-pressure regulating valve 7 is disposed on each of the water spray branch pipes 24 to regulate the water spray amount of the water spray branch pipes 24, so as to cool a loop with a higher wall temperature in a lower water-cooled wall loop.
For example, in the system for managing thermal deviation of the heated surfaces of the boiler furnace and the tail flue, as shown in fig. 1, water flows enter the lower water-cooled wall lower header 4, then enter the lower water-cooled wall outlet header 13 through the lower water-cooled wall tube panel 3, then enter the upper water-cooled wall inlet header 14 through the intermediate mixing header 5, then enter the upper water-cooled wall outlet header 15 through the upper furnace water-cooled wall tube panel 20, then enter the steam-water separator inlet tube 10 through the water-cooled wall outlet mixing header 16, and finally enter the steam-water separator 17.
For example, in the treatment system for the thermal deviation of the heating surfaces of the boiler furnace and the tail flue, as shown in fig. 3, two steam-water separators 17, namely a first steam-water separator 25 and a second steam-water separator 26, which are arranged at intervals are arranged on one side of the water wall outlet mixing header 16, the steam-water separator introducing pipe 10 includes a first group of steam-water separator introducing pipes 27 corresponding to the first steam-water separator 25 and a second group of steam-water separator introducing pipes 28 corresponding to the second steam-water separator 26, wherein a part of the first group of steam-water separator introducing pipes 27 is connected to the first steam-water separator 25, and the other part of the first group of steam-water separator introducing pipes 27 is connected to the second steam-water separator 26; and one part of the second group of steam-water separator introducing pipes 28 is connected with the second steam-water separator 26, and the other part of the second group of steam-water separator introducing pipes is connected with the first steam-water separator 25, so that the partial cross arrangement of the steam-water separator introducing pipes 10 is realized. According to the embodiment, part of the steam-water separator introducing pipes of the water-cooled wall outlet mixing header 16 are introduced into the steam-water separator inlet on the adjacent side in a crossed manner through the steam-water separator introducing pipe parts of the inlets of the two steam-water separators 17 which are arranged at intervals from the water-cooled wall outlet mixing header 16, so that steam with thermal deviation is fully mixed in the steam-water separators, and the steam deviation of the outlets of the two first steam-water separator 25 and the second steam-water separator 26 which are arranged at intervals is reduced.
Further, in order to ensure the mixing effect of the steam with thermal deviation in the steam-water separator, not less than half of the pipelines in the first group of steam-water separator introducing pipes 27 are connected with the first steam-water separator 25, and not less than half of the pipelines in the second group of steam-water separator introducing pipes 28 are connected with the second steam-water separator 26.
Because the length of the water-cooled wall outlet mixing header 16 is long, the water and the steam which enter the water-cooled wall outlet mixing header 16 from different upper water-cooled wall outlet mixing headers 15 have short mixing time in the water-cooled wall outlet mixing header 16, and the water and the steam which enter the water-steam separator 17 through the water-steam separator introducing pipe 10 without complete mixing heat exchange easily cause that two water-steam separators, namely the water and the steam in the first steam-water separator 25 and the second steam-water separator 26 have thermal deviation, the water-steam separator introducing pipe 10 is partially arranged in a cross way, the water and the steam at different sides of the water-cooled wall outlet mixing header 16 enter the same water-steam separator, so that the steam with thermal deviation is fully mixed in the water-steam separator, the steam deviation of the outlets of the first steam-water separator 25 and the second steam-water separator 26 which are arranged at intervals is reduced, and the problem of the steam temperature thermal deviation at two sides of the water-cooled wall outlet is thoroughly solved, the distribution of the steam temperature at the outlet of the water-cooled wall is uniform, the steam temperature flowing through the heated surface of the wrapping wall of the tail flue through the ceiling pipe has no thermal deviation, the thermal deviation of the wrapping wall pipe can be effectively eliminated through the connection mode, the thermal stress at two sides of the wrapping wall of the tail part is also eliminated, the problem of stress deformation or leakage of the wrapping wall pipe of the tail part is solved, and the pipe without tensile stress can not be subjected to tensile crack deformation or leakage.
For example, in the system for managing thermal deviation of the heating surfaces of the boiler furnace and the back flue according to an embodiment, as shown in fig. 3, the first group of steam-water separator introduction pipes 27 includes two groups, which are respectively located at two sides of the first steam-water separator 25, wherein a group of the first group of steam-water separator introduction pipes 27 away from the second steam-water separator 26 is connected to the first steam-water separator 25, and a group of the first group of steam-water separator introduction pipes 27 close to the second steam-water separator 26 is connected to the second steam-water separator 26; the second group of steam-water separator introducing pipes 28 comprise two groups which are respectively positioned at two sides of the second steam-water separator 26, wherein one group of the second group of steam-water separator introducing pipes 28 far away from the first steam-water separator 25 is connected with the second steam-water separator 26, and one group of the second group of steam-water separator introducing pipes 28 close to the first steam-water separator 25 is connected with the first steam-water separator 25 so as to realize the partial cross arrangement of the steam-water separator introducing pipes 10.
For example, in the system for managing thermal deviation of the heating surfaces of the boiler furnace and the tail flue, as shown in fig. 3, the first group of steam-water separator introduction pipes 27 includes six, and each group of three steam-water separator introduction pipes 27 is located on two sides of the first steam-water separator 25, respectively, where three first group of steam-water separator introduction pipes 27 far away from the second steam-water separator 26 are connected to the first steam-water separator 25, and three first group of steam-water separator introduction pipes 27 close to the second steam-water separator 26 are connected to the second steam-water separator 26; the second group of steam-water separator introducing pipes 28 comprise six, and each group of the second group of steam-water separator introducing pipes 28 is located on two sides of the second steam-water separator 26, wherein the second group of steam-water separator introducing pipes 28 are far away from the three first steam-water separators 25 and are connected with the second steam-water separator 26, and the second group of steam-water separator introducing pipes 28 are close to the three first steam-water separators 25 and are connected with the first steam-water separators 25.
Specifically, the upper water-cooled wall outlet header 15 includes a front wall water-cooled wall outlet header, a right wall water-cooled wall outlet header, a left wall water-cooled wall outlet header and a rear wall water-cooled wall outlet header, the front wall water-cooled wall outlet header and the right wall water-cooled wall outlet header are connected to the first steam-water separator 25, and the left wall water-cooled wall outlet header and the rear wall water-cooled wall outlet header are connected to the second steam-water separator 26.
The second aspect of the present application provides a method for managing thermal deviation of heating surfaces of a boiler furnace and a tail flue, as shown in fig. 4, including the following steps: numbering a plurality of lower water-cooled wall loops from 1 to N respectively, and measuring the highest wall temperature and the average wall temperature at the outlets of the N lower water-cooled wall loops; comparing the highest wall temperature at the outlet of each lower water-cooling wall loop with a preset wall temperature alarm value, such as the highest wall temperature and the average wall temperature at the outlet of the lower water-cooling wall loop of the ith road, (i is more than or equal to 1 and is more than or equal to N); if the highest wall temperature at the outlet of the lower water-cooling wall loop exceeds a preset wall temperature alarm value, opening the high-pressure regulating valve 7 on the water spraying branch pipe 24 of the lower water-cooling wall loop until the highest wall temperature at the outlet of the lower water-cooling wall loop is lower than the wall temperature alarm value; if the highest wall temperature at the outlet of the lower water-cooled wall loop does not exceed the preset wall temperature alarm value, continuing to compare the average wall temperature at the outlet of the lower water-cooled wall loop with the preset lower limit value of the wall temperature, and if the average wall temperature at the outlet of the lower water-cooled wall loop is lower than the preset lower limit value of the wall temperature, closing the high-pressure regulating valve 7 on the water spray branch pipe 24 of the lower water-cooled wall loop; until the highest wall temperature at the outlet of each lower water-cooling wall loop is between the preset wall temperature lower limit value and the wall temperature alarm value.
For example, in the method for managing the thermal deviation of the heating surfaces of the boiler furnace and the tail flue, according to one embodiment, the adjustment amount of the high-pressure adjusting valve 7 that is opened or closed each time is a fixed value and is 5% of the maximum flow of the high-pressure adjusting valve 7.
For example, in the method for managing thermal deviation of the heating surfaces of the boiler furnace and the tail flue, according to one embodiment, the minimum time interval between two adjacent adjustments of the high-pressure adjusting valve 7 on each lower water-cooling wall loop is 20s, so that the overshoot of the amount of temperature-reducing water and the frequent adjustment of the high-pressure adjusting valve 7 caused by the fluctuation of the wall temperature are prevented, the service life of the high-pressure adjusting valve 7 is prolonged, and the safety of a water spray temperature-reducing system is improved.
Although embodiments of the present application have been disclosed for illustrative purposes, those skilled in the art will recognize that: various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
Claims (10)
1. The utility model provides a treatment system of boiler furnace and afterbody flue heating surface thermal deviation which characterized in that includes:
the coal economizer comprises an inlet side and an outlet side, wherein the inlet side is connected with a water supply pipe, the outlet side is connected with a downcomer distribution header, and the downcomer distribution header is connected with a plurality of downcomer cold wall loops through a plurality of water supply pipes;
the lower water-cooled wall loop comprises a lower water-cooled wall lower header, a lower water-cooled wall tube panel and a lower water-cooled wall outlet header which are sequentially connected, the lower water-cooled wall lower header comprises a plurality of lower water-cooled wall loops, and the lower water-cooled wall lower headers correspond to the water supply tubes one by one; the water supply pipe on the inlet side of the economizer is connected with a water spray pipe, the tail end of the water spray pipe is provided with a plurality of water spray branch pipes, and the water spray branch pipes are connected with the water supply pipe in a one-to-one correspondence mode so as to adjust the wall temperature of each lower water cooling wall loop.
2. The system according to claim 1, wherein a high pressure check valve is disposed on each water supply pipe, and an access point of the water spray branch pipe and the water supply pipe is located downstream of the high pressure check valve, so as to prevent water in the water supply pipe from flowing back to the economizer through the water spray branch pipe.
3. The system according to claim 2, wherein a high pressure regulating valve is provided on each of said spray branches for regulating the amount of water sprayed from said spray branches.
4. The system according to claim 1, wherein the water flows into the lower water-cooled wall lower header, then through the lower water-cooled wall panels into the lower water-cooled wall outlet header, then through the intermediate mixing header into the upper water-cooled wall inlet header, then through the upper furnace water-cooled wall panels into the upper water-cooled wall outlet header, then through the water-cooled wall outlet mixing header into the steam-water separator inlet tubes, and finally into the steam-water separator.
5. The treatment system for the thermal deviation of the heating surfaces of the boiler furnace and the tail flue according to claim 4, wherein two steam-water separators which are arranged at intervals are arranged on one side of the water-cooled wall outlet mixing header and are respectively a first steam-water separator and a second steam-water separator, the steam-water separator inlet pipes comprise a first group of steam-water separator inlet pipes corresponding to the first steam-water separator and a second group of steam-water separator inlet pipes corresponding to the second steam-water separator, wherein one part of the first group of steam-water separator inlet pipes is connected with the first steam-water separator, and the other part of the first group of steam-water separator inlet pipes is connected with the second steam-water separator; and one part of the second group of steam-water separator introducing pipes is connected with the second steam-water separator, and the other part of the second group of steam-water separator introducing pipes is connected with the first steam-water separator, so that the part of the steam-water separator introducing pipes is arranged in a cross way.
6. The treatment system for the thermal deviation of the heating surfaces of the boiler furnace and the tail flue according to claim 5, wherein the first group of steam-water separator inlet pipes comprise two groups which are respectively positioned at two sides of the first steam-water separator, wherein one group of first group of steam-water separator inlet pipes far away from the second steam-water separator is connected with the first steam-water separator, and one group of first group of steam-water separator inlet pipes close to the second steam-water separator is connected with the second steam-water separator; the second group of steam-water separator inlet pipes comprise two groups which are respectively positioned at two sides of the second steam-water separator, wherein one group of the second group of steam-water separator inlet pipes far away from the first steam-water separator is connected with the second steam-water separator, and one group of the second group of steam-water separator inlet pipes close to the first steam-water separator is connected with the first steam-water separator.
7. The treatment system for the thermal deviation of the heating surface of the boiler furnace and the tail flue of claim 6, wherein the first group of steam-water separator inlet pipes comprise six, three in each group and are respectively positioned at two sides of the first steam-water separator, wherein the three first group of steam-water separator inlet pipes far away from the second steam-water separator are connected with the first steam-water separator, and the three first group of steam-water separator inlet pipes close to the second steam-water separator are connected with the second steam-water separator; the second group of steam-water separator introducing pipes comprise six, and each group of the second group of steam-water separator introducing pipes is respectively positioned at two sides of the second steam-water separator, wherein the second group of steam-water separator introducing pipes are far away from the three first steam-water separators and are connected with the second steam-water separator, and the second group of steam-water separator introducing pipes close to the three first steam-water separators are connected with the first steam-water separators.
8. The method for treating the thermal deviation of the heating surfaces of the boiler furnace and the tail flue of the boiler furnace according to any one of claims 1 to 7, which is characterized by comprising the following steps:
measuring the highest wall temperature and the average wall temperature at the outlet of each lower water-cooling wall loop;
comparing the highest wall temperature at the outlet of each lower water-cooling wall loop with a preset wall temperature alarm value;
if the highest wall temperature at the outlet of the lower water-cooling wall loop exceeds a preset wall temperature alarm value, opening a high-pressure regulating valve on a water spraying branch pipe of the lower water-cooling wall loop until the highest wall temperature at the outlet of the lower water-cooling wall loop is lower than the wall temperature alarm value;
if the highest wall temperature at the outlet of the lower water-cooled wall loop does not exceed the preset wall temperature alarm value, continuing to compare the average wall temperature at the outlet of the lower water-cooled wall loop with a preset wall temperature lower limit value, and if the average wall temperature at the outlet of the lower water-cooled wall loop is lower than the preset wall temperature lower limit value, closing a high-pressure regulating valve on a water spray branch pipe of the lower water-cooled wall loop;
until the highest wall temperature at the outlet of each lower water-cooling wall loop is between the preset wall temperature lower limit value and the wall temperature alarm value.
9. The method for managing the thermal deviation of the heating surfaces of the boiler furnace and the tail flue of the boiler furnace as claimed in claim 8, wherein the adjustment amount of the high-pressure adjusting valve which is opened or closed each time is a fixed value and is 5% of the maximum flow of the high-pressure adjusting valve.
10. The method according to claim 8, wherein the minimum time interval between two adjacent adjustments of the high-pressure adjusting valve on each lower water-cooled wall loop is 20 s.
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| CN202111329915.3A CN114459051A (en) | 2021-11-10 | 2021-11-10 | Treatment system and treatment method for thermal deviation of heated surfaces of boiler furnace and tail flue |
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| CN202111329915.3A CN114459051A (en) | 2021-11-10 | 2021-11-10 | Treatment system and treatment method for thermal deviation of heated surfaces of boiler furnace and tail flue |
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