CN110608429A - Method for accurately designing high-temperature reheater of double reheat boiler in partition mode - Google Patents
Method for accurately designing high-temperature reheater of double reheat boiler in partition mode Download PDFInfo
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- CN110608429A CN110608429A CN201910916428.3A CN201910916428A CN110608429A CN 110608429 A CN110608429 A CN 110608429A CN 201910916428 A CN201910916428 A CN 201910916428A CN 110608429 A CN110608429 A CN 110608429A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/08—Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G7/00—Steam superheaters characterised by location, arrangement, or disposition
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Abstract
A method for accurately designing a high-temperature reheater of a double reheat boiler in a partitioning manner belongs to the technical field of boiler design and manufacture; the prior art can only improve the material allowance by reducing the deviation between the tubes with the same screen; confirming the distribution rule of heat load in the boiler according to the arrangement mode of combustion and heating surfaces of the secondary reheating boiler, and simultaneously carrying out two-dimensional coordinate on the area of the high-temperature reheater from two directions of different screens in the width direction and different tubes in the depth direction; dividing the high-pressure end and the low-pressure end into 5 different regions along the width direction of the furnace according to the combustion of the high-pressure end and low-pressure end regions of the boiler and the distribution condition of the flue gas side along the width direction of the furnace; determining the flow rate of each region to be matched with the heat load according to the heat load distribution parameters of each region; on one hand, the heat absorption capacity of the tube panel is adjusted, on the other hand, the flow of the tube panel is adjusted, and the heat absorption capacity and the flow of the tube panel are combined to control the deviation of the tube panel; the wall temperature distribution deviation of the tube panel is reduced to 95-105% by adopting the design, and the wall temperature allowance of the material is increased.
Description
Technical Field
The invention belongs to the technical field of boiler design and manufacture, and particularly relates to a method for accurately designing a high-temperature reheater of a double reheat boiler in a partitioning mode.
Background
In order to meet the requirements of national energy conservation, emission reduction and environmental protection, the ultra-supercritical boiler with high-efficiency parameters becomes a novel and increasingly common thermal power generating unit and gradually becomes the main force of the future electric power market. After the parameters of the high-efficiency ultra-supercritical turbine are improved, the high-efficiency ultra-supercritical turbine has the characteristics that the heat efficiency of the unit is greatly improved, and the pollutant emission is further reduced; at present, an ultra-supercritical and even a double-reheating ultra-supercritical coal-fired unit with high-efficiency parameters becomes a mainstream product in the current power industry, and the improvement of steam temperature parameters and the multiple reheating become main means for improving the efficiency of a power plant unit.
The temperature of two-stage reheating steam of the double reheating boiler reaches 623-633 ℃, only 650 ℃ can be used by adopting P92 material, and the material allowance is very small. The deviation on the smoke side is fixed, and the space for further reduction is limited. The deviation can only be reduced starting from the steam side. The prior art can only improve the material margin by reducing the deviation between the same screen tubes.
Disclosure of Invention
The invention overcomes the defects of the prior art, provides a method for accurately designing the high-temperature reheater of the double reheat boiler in a partitioned mode, and aims at a fine deviation control method of different screens to improve material allowance instead of aiming at the same tube screen.
The technical scheme of the invention is as follows:
a method for accurately designing a high-temperature reheater of a double reheat boiler in a partitioned mode comprises the following steps:
step 1, determining heat load distribution: confirming the distribution rule of heat load in the furnace according to the combustion and heating surface arrangement mode of the secondary reheating boiler, and simultaneously carrying out two-dimensional coordinate on the area of the high-temperature reheater from two directions of different screens in the width direction and different tubes in the depth direction;
step 2, accurate partitioning: dividing the high-pressure end and the low-pressure end into 5 different regions along the width direction of the furnace according to the combustion of the high-pressure end and low-pressure end regions of the boiler and the distribution condition of the flue gas side along the width direction of the furnace;
step 3, matching the flow of the partitioned tube panel with the heat load: determining the flow rate of each region to be matched with the heat load according to the heat load distribution parameters of each region;
step 4, taking measures: on one hand, the heat absorption capacity of the tube panel is adjusted, on the other hand, the flow of the tube panel is adjusted, and the heat absorption capacity and the flow of the tube panel are combined to control the deviation of the tube panel;
step 5, controlling the result: the wall temperature distribution deviation of the tube panel is reduced to 95-105% by adopting the design, and the wall temperature allowance of the material is increased.
Further, the specific processing method for performing two-dimensional coordinate transformation on the area of the high-temperature reheater from two directions of different screens in the width direction and different tubes in the depth direction is to mark coordinates on the tube panels along the two directions of the width and the depth of the hearth according to the actual operation wall temperature distribution conditions, namely, the reaction heat load distribution, discretize the tube panels, and prepare for subsequent zoning.
Further, the specific method for dividing the high-pressure end and the low-pressure end into 5 different areas along the furnace width direction comprises the steps of determining according to the heat load distribution condition of the step 1, and dividing into 5 areas according to different positions of the tube panel and the height of the heat load.
Further, the specific method for determining the matching of the flow of each area and the heat load according to the heat load distribution parameters of each area comprises the steps of calculating the wall temperature of the single-chip screen through the determined heat load deviation coefficients of the areas, determining the flow of each area of 5 areas, calculating the flow required by the area according to the heat load condition of the areas in the step 2 through the wall temperature, wherein the higher the heat load of the areas is, the larger the required flow is, the lower the heat load of the areas is, the smaller the required flow is, and the flow of the areas is matched with the heat load flow.
Furthermore, on one hand, the heat absorption capacity of the tube panel is adjusted, on the other hand, the flow of the tube panel is adjusted, the deviation of the tube panel is controlled by combining the heat absorption capacity and the flow of the tube panel, on the one hand, the specification of the pipe joint is adjusted, on the other hand, the length of the tube panel is controlled, the heat absorption capacity and the flow of the tube panel are controlled, the wall temperature of each area is controlled to be uniform by combining the heat absorption capacity and the flow of the tube panel, and meanwhile, the structure of the tube panel is.
Further, after the flow required by each partitioned tube panel is obtained according to the step 3, the flow is realized by an operation method, wherein the operation method comprises the steps of increasing a throttling short tube, adjusting the specification of a tube joint, opening a header, adjusting the length of the tube panel and spraying a heating surface.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a method for accurately designing a high-temperature reheater of a double reheat boiler in a partitioned mode, wherein a deviation coefficient of each coordinate can be calculated by determining heat load distribution and used as a basis for accurate design; the heat load in the width direction is divided into 5 areas, so that the heat load distribution rule is closer to the heat load distribution rule of an actual double reheat boiler; calculating the wall temperature of the single-chip screen through the determined heat load deviation coefficients of all the areas, and determining the flow of each area of 5 areas; the structure of the tube screen is adjusted under the condition that the specification of the tube joint is not increased, so that the deviation of tubes with the same screen is reduced; the wall temperature distribution deviation of the finely designed tube panel is reduced to 95% -105%, and the wall temperature allowance of the material is increased.
Drawings
FIG. 1 is a view of a tube panel along the width of a furnace;
FIG. 2 is a depth map of tube panels along a furnace;
FIG. 3 is a graph of temperature profiles for 5 different zones;
FIG. 4 is a schematic view of a tube panel width;
FIG. 5 is a schematic of tube panel depth;
FIG. 6 is a diagram of adding a choke spool;
FIG. 7 is a schematic view of adjusting the gauge of the pipe joint and adjusting the length of the tube panel;
FIG. 8 is a header opening view;
FIG. 9 is a graph of the front wall temperature distribution for a zoned design;
FIG. 10 is a graph of wall temperature distribution after zoned design;
fig. 11 is a cover plate structure view.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
A method for accurately designing a high-temperature reheater of a double reheat boiler in a partitioned mode comprises the following steps:
step 1, determining heat load distribution: according to the arrangement mode of combustion and heating surfaces of the secondary reheating boiler, the distribution rule of heat load in the boiler is confirmed, and meanwhile, two-dimensional coordinate transformation is carried out on the area of the high-temperature reheater from two directions of different screens in the width direction and different tubes in the depth direction, as shown in fig. 1 and fig. 2; the heat load distribution rule in the prior art is only one direction of different screens in the width direction, the wall temperature control is not fine enough, and the problem of different pipes in the same screen is ignored. In the prior art, 1-dimensional consideration is adopted, 2-dimensional consideration is adopted in the step, and the deviation coefficient of each coordinate can be calculated and used as a basis for accurate design;
step 2, accurate partitioning: dividing the high-pressure end and the low-pressure end into 5 different areas along the width direction of the furnace according to the distribution conditions of the combustion of the high-pressure end and low-pressure end areas of the boiler and the width direction of a smoke side hearth of the flue gas, as shown in figure 3; the partition in the prior art is two areas, one area is strong in heating, the other area is weak in heating, the distribution rule of the heat load cannot be completely reflected, and the heat load distribution rule is not fine enough, the heat load in the width direction is divided into 5 areas in the step, and the heat load distribution rule is closer to the heat load distribution rule of an actual double reheat boiler;
step 3, matching the flow of the partitioned tube panel with the heat load: determining the flow rate of each region to be matched with the heat load according to the heat load distribution parameters of each region; in the prior art, the flow of a region with strong heating and a region with weak heating are generally directly given, wherein the flow of the region with strong heating is 70-80%, and the flow of the region with weak heating is 20-30%; calculating the wall temperature of the single-chip screen through the determined heat load deviation coefficients of all the areas, and determining the flow of each area of 5 areas;
step 4, taking measures: on one hand, the heat absorption capacity of the tube panel is adjusted, on the other hand, the flow of the tube panel is adjusted, and the heat absorption capacity and the flow of the tube panel are combined to control the deviation of the tube panel; in the prior art, the flow of a weak heating area is reduced only by increasing a throttling hole in the weak heating area, the actual control effect is limited, the step is used for regulating the specification of a pipe joint to control the flow, controlling the length of a pipe screen to control the heat absorption capacity and controlling the wall temperature of each area to be uniform by combining the regulation and the heat absorption capacity, and meanwhile, the step is used for regulating the structure of the pipe screen under the condition that the specification of the pipe joint is not increased, so that the deviation of pipes on the same screen is reduced;
step 5, controlling the result: the wall temperature distribution deviation of the tube panel is reduced to 95-105% by adopting the design, and the wall temperature allowance of the material is increased. The measures generally adopted in the prior art are mainly to increase a throttling device and ensure the matching of heat load and flow by reducing the flow, and the problems of single means, large adjustment difficulty and unobvious effect exist in practice. The wall temperature deviation distribution can be controlled to be 75% -110%, the step is more diversified, the control effect is obvious, the wall temperature distribution rule is a curve formed by connecting the wall temperatures of the same tube panel along the width direction of the hearth, the significance is great for guiding the operation of the boiler, as shown in fig. 9-10, the second curve in fig. 9 and the first curve in fig. 10 represent the wall temperature distribution, the wall temperature distribution deviation after the partition design is smaller, the operation is facilitated, and the wall temperature deviation distribution is expected to be obtained by the operation of the boiler.
Specifically, the specific processing method for performing two-dimensional coordinate transformation on the area of the high-temperature reheater from two directions of different screens in the width direction and different tubes in the depth direction is to mark coordinates on the tube panels along the two directions of the width and the depth of the hearth according to the actual operation wall temperature distribution conditions, namely, the reaction heat load distribution, perform discretization, and prepare for subsequent zoning.
Specifically, the specific method for dividing the high-pressure end and the low-pressure end into 5 different areas along the furnace width direction comprises the steps of determining according to the heat load distribution condition of the step 1, and dividing into 5 areas according to different positions of the tube panel and the height of the heat load.
Specifically, the specific method for determining the matching of the flow of each area and the heat load according to the heat load distribution parameters of each area comprises the steps of calculating the wall temperature of the single-chip screen through the determined heat load deviation coefficients of the areas, determining the flow of each area of 5 areas, calculating the flow required by the area according to the heat load condition of the areas in the step 2 through the wall temperature, and enabling the flow of the areas to be matched with the heat load flow, wherein the higher the heat load of the areas is, the larger the required flow is, and the lower the heat load of the areas is, the smaller the required flow is.
Specifically, on one hand, the heat absorption capacity of the tube panel is adjusted, on the other hand, the flow of the tube panel is adjusted, the deviation of the tube panel is controlled by combining the heat absorption capacity and the flow of the tube panel, on the one hand, the specification of the pipe joint is adjusted, on the other hand, the heat absorption capacity is controlled by controlling the length of the tube panel, the wall temperature of each area is controlled to be uniform by combining the heat absorption capacity and the flow of the tube panel, and meanwhile, the structure of the tube panel is adjusted under the condition that the specification.
Specifically, after the flow rate required by each partitioned tube panel is obtained according to step 3, the flow rate needs to be realized through an operation method, which includes increasing a throttling short tube, adjusting the specification of a tube joint, opening a header, adjusting the length of the tube panel, spraying a heated surface, and adding a cover plate, as shown in fig. 4-8 and 11.
Claims (6)
1. A method for accurately designing a high-temperature reheater of a double reheat boiler in a partitioned mode is characterized by comprising the following steps:
step 1, determining heat load distribution: confirming the distribution rule of heat load in the furnace according to the combustion and heating surface arrangement mode of the secondary reheating boiler, and simultaneously carrying out two-dimensional coordinate on the area of the high-temperature reheater from two directions of different screens in the width direction and different tubes in the depth direction;
step 2, accurate partitioning: dividing the high-pressure end and the low-pressure end into 5 different regions along the width direction of the furnace according to the combustion of the high-pressure end and low-pressure end regions of the boiler and the distribution condition of the flue gas side along the width direction of the furnace;
step 3, matching the flow of the partitioned tube panel with the heat load: determining the flow rate of each region to be matched with the heat load according to the heat load distribution parameters of each region;
step 4, taking measures: on one hand, the heat absorption capacity of the tube panel is adjusted, on the other hand, the flow of the tube panel is adjusted, and the heat absorption capacity and the flow of the tube panel are combined to control the deviation of the tube panel;
step 5, controlling the result: the wall temperature distribution deviation of the tube panel is reduced to 95-105% by adopting the design, and the wall temperature allowance of the material is increased.
2. The method as claimed in claim 1, wherein the specific processing method for performing two-dimensional coordinate transformation on the high-temperature reheater area from two directions of different width-direction screens and different depth-direction tubes is to mark coordinates on the tube screens along two directions of furnace width and depth according to actual operation wall temperature distribution, namely reaction heat load distribution, and perform discretization to prepare for subsequent zoning.
3. The method for accurately designing the high-temperature reheater of the double reheat boiler in the partitioned manner as set forth in claim 1, wherein the specific method for dividing the high-pressure end reheater and the low-pressure end reheater into 5 different areas along the width direction of the boiler includes determining the heat load distribution according to step 1, and dividing the areas into 5 areas according to different positions of tube panels and the height of the heat load.
4. The method for accurately designing the partitions of the high-temperature reheater of the double reheat boiler according to claim 1, wherein the specific method for determining the matching of the flow rate of each partition and the heat load according to the heat load distribution parameters of each partition comprises the steps of calculating the wall temperature of a single-chip screen through the determined heat load deviation coefficients of the partitions, determining the flow rate of each partition of 5 partitions, calculating the flow rate required by each partition according to the wall temperature according to the heat load condition of the partition in the step 2, and enabling the partition flow rate to be matched with the heat load flow rate due to the fact that the higher the partition heat load is, the higher the required flow rate is, the lower the partition heat load is, and the smaller the required flow rate is.
5. The method as claimed in claim 1, wherein the adjusting of the heat absorption capacity of the tube panels and the adjusting of the flow rate of the tube panels in combination controls the deviation of the tube panels, namely, the adjusting of the specification of the tube joints to control the flow rate and the controlling of the length of the tube panels to control the heat absorption capacity, and the controlling of the wall temperature of each area to be uniform, and the adjusting of the tube panel structure without increasing the specification of the tube joints reduces the deviation of tubes on the same screen.
6. The method for accurately designing the high-temperature reheater of the double reheat boiler in the subarea manner of claim 5, wherein after the flow rate required by each subarea tube panel is obtained according to the step 3, the flow rate is realized by an operation method, and the operation method comprises the steps of increasing a throttling short tube, adjusting the specification of a tube joint, opening a header, adjusting the length of the tube panel and spraying a heating surface.
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| CN201910916428.3A CN110608429B (en) | 2019-09-26 | 2019-09-26 | Method for accurately designing high-temperature reheater of double reheat boiler in partition mode |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111964087A (en) * | 2020-07-17 | 2020-11-20 | 中国神华能源股份有限公司国华电力分公司 | Boiler flue gas deviation adjusting device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104676573A (en) * | 2015-03-09 | 2015-06-03 | 章礼道 | 720-DEG C efficient ultra-supercritical secondary reheating power plant boiler |
| CN109945158A (en) * | 2019-03-25 | 2019-06-28 | 哈尔滨锅炉厂有限责任公司 | One kind liquidates tower 660MW double reheat boiler |
| CN110260290A (en) * | 2019-06-24 | 2019-09-20 | 大唐郓城发电有限公司 | A kind of double reheat boiler wall temperature method for correcting error |
-
2019
- 2019-09-26 CN CN201910916428.3A patent/CN110608429B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104676573A (en) * | 2015-03-09 | 2015-06-03 | 章礼道 | 720-DEG C efficient ultra-supercritical secondary reheating power plant boiler |
| CN109945158A (en) * | 2019-03-25 | 2019-06-28 | 哈尔滨锅炉厂有限责任公司 | One kind liquidates tower 660MW double reheat boiler |
| CN110260290A (en) * | 2019-06-24 | 2019-09-20 | 大唐郓城发电有限公司 | A kind of double reheat boiler wall temperature method for correcting error |
Non-Patent Citations (2)
| Title |
|---|
| 宋宝军等: "《1000MW等级超超临界二次再热Π型锅炉关键技术研究》", 《科学技术创新》 * |
| 宋宝军等: "《630℃高效二次再热锅炉关键技术研究》", 《科学技术创新》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111964087A (en) * | 2020-07-17 | 2020-11-20 | 中国神华能源股份有限公司国华电力分公司 | Boiler flue gas deviation adjusting device |
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