CN113446594B - Method capable of rapidly judging slag bonding and contamination conditions of boiler heating surface - Google Patents
Method capable of rapidly judging slag bonding and contamination conditions of boiler heating surface Download PDFInfo
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- CN113446594B CN113446594B CN202110875799.9A CN202110875799A CN113446594B CN 113446594 B CN113446594 B CN 113446594B CN 202110875799 A CN202110875799 A CN 202110875799A CN 113446594 B CN113446594 B CN 113446594B
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Abstract
The invention discloses a method for rapidly judging the slag bonding and contamination condition of a boiler heating surface, which comprises the following steps: 1) measuring the temperature of the heating surface of the boiler in real time; 2) calculating the temperature rise of each heating surface; 3) measuring the real-time load Pe of the boiler in real time; 4) acquiring the design steam temperature of each heating surface of each load section of the boiler, and calculating the design steam temperature of each heating surface when the boiler load is Pe by using an interpolation method according to the real-time load Pe of the boiler; 5) calculating the design temperature rise of each heating surface; 6) comparing the difference between the actual value and the designed value of the steam temperature rise of each heating surface; 7) and judging the slagging and contamination conditions of all the heating surfaces. The invention does not need to carry out equipment modification or only needs to carry out minor modification on the prior boiler, has low cost and can quickly judge the slagging and contamination conditions of the main heating surface of the boiler.
Description
Technical Field
The invention belongs to the field of power generation, and particularly relates to a method capable of rapidly judging slag bonding and contamination conditions of a boiler heating surface.
Background
Slagging and contamination of a heating surface of a coal-fired boiler are inevitable phenomena in the operation process of the boiler and are one of main reasons for accidents such as temperature deviation, tube explosion, overtemperature and the like of the boiler, so that monitoring of slagging and contamination of the heating surface of the boiler is a very important link in the operation process of the boiler. Generally, the slagging and contamination of the heating surface of the boiler are monitored by arranging observation holes on the boiler wall of the boiler and manually observing the slagging and contamination conditions of the heating surface, and the method has large limitation and can only observe and obtain the slagging and contamination conditions of local positions.
Disclosure of Invention
The invention aims to provide a method for rapidly judging the slagging and contamination conditions of the heating surface of a boiler, which does not need equipment modification or only needs minor modification on the conventional boiler, has low cost and can rapidly judge the slagging and contamination conditions of the main heating surface of the boiler.
The invention is realized by adopting the following technical scheme:
a method for rapidly judging the slagging and contamination conditions of a heating surface of a boiler comprises the following steps:
1) real-time measurement of water wall inlet steam temperature T (Water wall) in Water cooled wall outlet steam temperature T (water cooled wall) out And the inlet steam temperature T of the low-temperature superheater (low-temperature superheater) in And the temperature T of the steam at the outlet of the low-temperature superheater (low-temperature superheater) out And screen superheater inlet steam temperature T (screen superheater) in And screen superheater outlet steam temperature T (screen superheater) ou T, high temperature superheater inlet steam temperature T (high temperature superheater) in High temperature superheater outlet steam temperature T (high temperature superheater) out Low temperature reheater inlet steam temperature T (low temperature reheater) in Low temperature reheater outlet steam temperature T (low temperature reheater) out High temperature reheater inlet steam temperature T (high temperature reheater) in High temperature reheater outlet steam temperature T (high temperature reheater) out ；
2) Calculating the temperature rise of each heating surface:
water wall steam temperature rise: delta T (water wall) ═ T (water wall) out -T (Water cooled wall) in ；
Steam temperature rise of the low-temperature superheater: delta T (low temperature superheater) ═ T (low temperature superheater) out -T (Low temperature superheater) in ；
Steam temperature rise of the platen superheater: delta T (platen superheater) ═ T (platen superheater) out -T (platen superheater) in ；
Steam temperature rise of the high-temperature superheater: delta T (high temperature superheater) out -T (high temperature superheater) in ；
Temperature rise of steam of the low-temperature reheater: Δ T (low temperature reheater) ═ T (low temperature reheater) out -T (Low temperature reheater) in ；
Temperature rise of steam of the high-temperature reheater: Δ T (high temperature reheater) ═ T (high temperature reheater) out -T (high temperature reheater) in ；
3) Measuring the real-time load Pe of the boiler in real time;
4) obtaining the design steam temperature of each heating surface of each load section of the boiler, and calculating the design steam temperature of each heating surface when the boiler load is Pe by using an interpolation method according to the real-time load Pe of the boiler: design Water wall Inlet steam temperature T (Water wall) in ', design Water wall outlet steam temperature T (Water wall) out ', design of the Low temperature superheater Inlet steam temperature T (Low temperature superheater) in ', design of the outlet steam temperature T of the low temperature superheater (Low temperature superheater) out ', design platen superheater inlet steam temperature T (platen superheater) in ', design platen superheater outlet steam temperature T (platen superheater) out ', design high temperature superheater inlet steam temperature T (high temperature superheater) in ', design high temperature superheater outlet steam temperature T (high temperature superheater) out ', design Low temperature reheater Inlet steam temperature T (Low temperature reheater) in ', design Low temperature reheater Outlet steam temperature T (Low temperature reheater) out ', design high temperature reheater Inlet steam temperature T (high temperature reheater) in ', design high temperature reheater outlet steam temperature T (high temperature reheater) out ′；
5) Calculating the design temperature rise of each heating surface:
designing the steam temperature rise of the water wall: delta T (Water wall)' -T (Water wall) out ' -T (Water wall) in ′；
Designed low temperature superheatTemperature rise of steam in the device: delta T (low temperature superheater)' -T (low temperature superheater) out ' -T (Low temperature superheater) in ′；
Designing the steam temperature rise of the platen superheater: delta T (platen superheater)' -T (platen superheater) out ' -T (platen superheater) in ′；
Designing the steam temperature rise of the high-temperature superheater: delta T (high temperature superheater)' -T (high temperature superheater) out ' -T (high temperature superheater) in ′；
Designing the steam temperature rise of a low-temperature reheater: Δ T (low temperature reheater)' ═ T (low temperature reheater) out ' -T (Low temperature reheater) in ′；
Designing the steam temperature rise of a high-temperature reheater: Δ T (high temperature reheater)' -T (high temperature reheater) out ' -T (high temperature reheater) in ′；
6) Comparing the difference between the actual value and the designed value of the steam temperature rise of each heating surface:
deviation of an actual value of the steam temperature rise of the water wall from a design value:
t (water wall) ═ Δ T (water wall) - Δ T (water wall)';
deviation of the actual steam temperature rise value of the low-temperature superheater from the design value:
t (low-temperature superheater) ═ Δ T (low-temperature superheater) - Δ T (low-temperature superheater)';
deviation of the actual value of the steam temperature rise of the platen superheater from the design value:
t (low-temperature superheater) ═ Δ T (low-temperature superheater) - Δ T (low-temperature superheater)';
deviation of the actual value of the steam temperature rise of the high-temperature superheater from the design value:
t (high temperature superheater) ═ Δ T (high temperature superheater) - Δ T (high temperature superheater)';
deviation of the actual value of the steam temperature rise of the low-temperature reheater from the design value:
t (low-temperature reheater) ═ Δ T (low-temperature reheater) - Δ T (low-temperature reheater)';
deviation of the actual value of the steam temperature rise of the high-temperature reheater from the design value:
t (high-temperature reheater) ═ Δ T (high-temperature reheater) - Δ T (high-temperature reheater)';
7) and judging the slagging and contamination conditions of all the heating surfaces.
The invention has the further improvement that in the step 1), the temperature rise of steam at the left side and the right side of the water-cooled wall, the low-temperature superheater, the platen superheater, the high-temperature superheater, the low-temperature reheater and the high-temperature reheater is compared with the deviation of a design value, so that the slag bonding and contamination condition at the left side or the right side of the heated surface is judged.
The further improvement of the invention is that in the step 7), for the water-cooled wall of the once-through furnace:
if T (water wall) > -10 ℃, the water wall is slightly slagging and contamination, and soot blowing measures can be not considered;
if T (water-cooled wall) is more than or equal to 50 ℃ below zero and less than or equal to 10 ℃ below zero, the water-cooled wall is heavy in slag bonding and contamination, and soot blowing needs to be enhanced;
if T (water wall) is less than-50 ℃, soot blowing needs to be enhanced, and boiler combustion or coal blending is considered to be adjusted so as to reduce slagging and contamination of the water wall.
A further development of the invention is that, in step 7), for the low-temperature superheater:
if T (low-temperature superheater) is more than 0 ℃, slagging and contamination of the low-temperature superheater are slight, and soot blowing measures can not be considered;
if T (low-temperature superheater) is more than or equal to minus 30 ℃ and less than or equal to 0 ℃, slagging, contamination or ash blockage of the low-temperature superheater are heavy, and soot blowing needs to be enhanced;
if T (low temperature superheater) is less than-30 ℃, soot blowing needs to be enhanced, and boiler combustion or coal blending is considered to be adjusted so as to reduce slagging, contamination and soot blockage of the low temperature superheater.
A further development of the invention is that, in step 7), for the platen superheater:
if T (platen superheater) > -10 ℃, slagging and contamination of the platen superheater are slight, and soot blowing measures can not be considered;
if T (screen superheater) is more than or equal to minus 30 ℃ and less than or equal to minus 10 ℃, slagging and contamination of the screen superheater are heavy, and soot blowing needs to be enhanced;
if T (platen superheater) is less than-30 ℃, soot blowing needs to be enhanced, and boiler combustion or coal blending is considered to be adjusted so as to reduce slagging and contamination of the platen superheater.
A further development of the invention is that, in step 7), for the high-temperature superheater:
if T (high temperature superheater) is more than 0 ℃, slagging and contamination of the high temperature superheater are slight, and soot blowing measures can not be considered;
if T (high temperature superheater) is more than or equal to minus 30 ℃ and less than or equal to 0 ℃, slagging and contamination of the high temperature superheater are heavy, and soot blowing needs to be enhanced;
if T (high temperature superheater) is less than-30 ℃, soot blowing needs to be enhanced, and boiler combustion or coal blending is considered to be adjusted so as to reduce slagging and contamination of the high temperature superheater.
A further development of the invention is that, in step 7), for the low-temperature reheater:
if T (low-temperature reheater) > 0 ℃, slagging and contamination of the low-temperature reheater are slight, and soot blowing measures can not be considered;
if T (low-temperature reheater) is more than or equal to minus 30 ℃ and less than or equal to 0 ℃, the low-temperature reheater is heavy in slagging, contamination or ash blockage, and soot blowing needs to be enhanced;
if T (low-temperature reheater) is less than-30 ℃, soot blowing needs to be enhanced, and boiler combustion or coal blending is considered to be adjusted so as to reduce slagging, contamination and soot blockage of the low-temperature reheater.
A further development of the invention is that, in step 7), for the high-temperature reheater:
if T (high temperature reheater) > 0 ℃, the high temperature reheater is slightly slagging and contaminated, and soot blowing measures can not be considered;
if T (high temperature reheater) is more than or equal to minus 30 ℃ and less than or equal to 0 ℃, the high temperature reheater is heavy in slagging and contamination, and soot blowing needs to be enhanced;
if T (high temperature reheater) is less than-30 ℃, soot blowing needs to be enhanced, and boiler combustion or coal blending is considered to be adjusted so as to reduce slagging and contamination of the high temperature reheater.
The invention has at least the following beneficial technical effects:
1. the existing boiler is not required to be modified by equipment or only needs to be modified slightly, so that the investment is low;
2. under the condition of no other judgment measures, the slag bonding and contamination conditions of the heating surface of the boiler can be quickly judged in advance, measures are taken, and the operation safety of the boiler is improved.
Detailed Description
The present invention will be further described with reference to the following examples.
(1) 660MW ultra-supercritical once-through boiler unit of a certain power plant burns easily slagged coal, and when boiler load was 550MW, the dial plate showed that steam temperature everywhere is shown in the following table:
according to the table, the temperature rise of each heating surface is calculated:
water wall steam temperature rise: delta T (water wall) ═ T (water wall) out -T (Water cooled wall) in ＝111℃
Steam temperature rise of the low-temperature superheater: delta T (low temperature superheater) ═ T (low temperature superheater) out -T (Low temperature superheater) in ＝79.5℃；
Steam temperature rise of the platen superheater: delta T (platen superheater) ═ T (platen superheater) out -T (platen superheater) in ＝45.5℃；
Steam temperature rise of the high-temperature superheater: delta T (high temperature superheater) out -T (high temperature superheater) in ＝42.5℃；
Temperature rise of steam of the low-temperature reheater: Δ T (Low temperature reheater) ═ T (Low temperature reheater) out -T (Low temperature reheater) in ＝140.5℃；
Temperature rise of steam of the high-temperature reheater: Δ T (high temperature reheater) ═ T (high temperature reheater) out -T (high temperature reheater) in ＝74.5℃：
(2) The design base steam temperature at 660MW and 495MW of the boiler is inquired and shown in the following table.
The steam temperature at each position at 550MW is calculated by interpolation, see table below.
| Name(s) | (symbol) | Unit of | Design value |
| Design water wall inlet steam temperature at 550MW | T (Water cooling wall) in ′ | ℃ | 287.5 |
| Design water wall outlet steam temperature at 550MW | T (Water cooling wall) out ′ | ℃ | 428.0 |
| Design low temperature superheater inlet steam temperature at 550MW | T (Low temperature superheater) in ′ | ℃ | 428.0 |
| Design low temperature superheater outlet steam temperature at 550MW | T (Low temperature superheater) out ′ | ℃ | 491.7 |
| Inlet steam temperature of platen superheater designed at 550MW | T (Screen type superheater) in ′ | ℃ | 488.3 |
| 550MW time design platen superheater outlet steam temperature | T (platen superheater) out ′ | ℃ | 568.0 |
| Design high temperature superheater inlet steam temperature at 550MW | T (high temperature superheater) in ′、 | ℃ | 543.7 |
| Design high temperature superheater outlet steam temperature at 550MW | T (high temperature superheater) out ′ | ℃ | 605.0 |
| Design low temperature reheater inlet steam temperature at 550MW | T (Low temperature reheater) in ′ | ℃ | 362.3 |
| Design low temperature reheater outlet steam temperature at 550MW | T (Low temperature reheater) out ′ | ℃ | 508.3 |
| Design high temperature reheater inlet steam temperature at 550MW | T (high temperature reheater) in ′ | ℃ | 508.3 |
| Design high temperature reheater outlet steam temperature at 550MW | T (high temperature reheater) out ′ | ℃ | 603.0 |
Calculating the design temperature rise of each heating surface:
designing the steam temperature rise of the water wall: delta T (Water wall)' -T (Water wall) out ' -T (Water wall) in ′＝140.5℃；
Designing the steam temperature rise of the low-temperature superheater: delta T (low temperature superheater)' -T (low temperature superheater) out ' -T (Low temperature superheater) in ′＝63.7℃；
Designing the steam temperature rise of the platen superheater: delta T (platen superheater)' -T (platen superheater) out ' -T (platen superheater) in ′＝79.7℃；
Designing the steam temperature rise of the high-temperature superheater: delta T (high temperature superheater)' -T (high temperature superheater) out ' -T (high temperature superheater) in ′＝61.3℃；
Designing the steam temperature rise of a low-temperature reheater: Δ T (low temperature reheater)' ═ T (low temperature reheater) out ' -T (Low temperature reheater) in ′＝146℃；
Designing the steam temperature rise of a high-temperature reheater: Δ T (high temperature reheater)' -T (high temperature reheater) out ' -T (high temperature reheater) in ′＝94.7℃；
3) Comparing the difference between the actual value and the designed value of the steam temperature rise of each heating surface:
deviation of an actual value of the steam temperature rise of the water wall from a design value:
t (water wall) ═ Δ T (water wall) - Δ T (water wall)' -29.5 ℃;
deviation of the actual steam temperature rise value of the low-temperature superheater from the design value:
t (low-temperature superheater) ═ delta T (low-temperature superheater) — delta T (low-temperature superheater)' -15.8 ℃;
deviation of the actual value of the steam temperature rise of the platen superheater from the design value:
t (low temperature superheater) ═ Δ T (low temperature superheater) - Δ T (low temperature superheater)' -34.2 ℃;
deviation of the actual value of the steam temperature rise of the high-temperature superheater from the design value:
t (high temperature superheater) ═ Δ T (high temperature superheater) - Δ T (high temperature superheater)' -18.8 ℃;
deviation of the actual value of the steam temperature rise of the low-temperature reheater from the design value:
t (low-temperature reheater) ═ Δ T (low-temperature reheater) - Δ T (low-temperature reheater)' -6 ℃;
deviation of the actual value of the steam temperature rise of the high-temperature reheater from the design value:
t (high temperature reheater) ═ Δ T (high temperature reheater) - Δ T (high temperature reheater)' -20.2 ℃;
7) the slagging and contamination of each heating surface are judged according to the following conditions:
for waterwalls: t (water wall) ═ 15.8 ℃, the water wall is heavy in slagging and contamination, and soot blowing needs to be enhanced;
for a low temperature superheater: t (low temperature superheater) is-15.8 ℃, the low temperature superheater has heavy slagging, contamination or ash blockage, and soot blowing needs to be strengthened;
for platen superheaters: t (platen superheater) — 31.2 ℃, the platen superheater has heavy slagging and contamination, and soot blowing needs to be enhanced;
for a high temperature superheater: t (high temperature superheater) — 18.8 ℃, the high temperature superheater has heavy slagging and contamination, and soot blowing needs to be enhanced;
for a low temperature reheater: t (low-temperature reheater) ═ 6 ℃, the low-temperature reheater is heavy in slagging, contamination or ash blockage, and soot blowing needs to be enhanced;
for a high temperature reheater: t (high temperature reheater) — 20.2 ℃, the slag bonding and contamination of the high temperature reheater are heavy, and soot blowing needs to be enhanced.
According to the judgment, the low-temperature reheater, the platen superheater, the high-temperature reheater, the water-cooled wall, the low-temperature superheater and the high-temperature superheater of the boiler are seriously slagging or stained, the slagging or staining condition of the tube wall is observed to be consistent with the judgment result through the observation hole on site, the operator takes measures such as strengthening soot blowing and the like to mix and burn part of high-ash-melting-point coal in the coal as fired, the slagging and staining states of the heating surface are not further deteriorated, and the safe operation of the boiler is ensured.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. A method for rapidly judging the slagging and contamination conditions of a heating surface of a boiler is characterized by comprising the following steps:
1) real-time measurement of water wall inlet steam temperature T (Water wall) in Water cooled wall outlet steam temperature T (water cooled wall) out And the temperature T of the steam at the inlet of the low-temperature superheater (low-temperature superheater) in And the temperature T of the steam at the outlet of the low-temperature superheater (low-temperature superheater) out And screen superheater inlet steam temperature T (screen superheater) in And screen superheater outlet steam temperature T (screen superheater) out High temperature superheater inlet steam temperature T (high temperature superheater) in High temperature superheater outlet steam temperature T (high temperature superheater) out Low temperature reheater inlet steam temperature T (low temperature reheater) in Low temperature reheater outlet steam temperature T (low temperature reheater) out High temperature reheater inlet steam temperature T (high temperature reheater) in High temperature reheater outlet steam temperature T (high temperature reheater) out ；
2) Calculating the temperature rise of each heating surface:
water wall steam temperature rise: delta T (water wall) ═ T (water wall) out -T (Water cooled wall) in ；
Steam temperature rise of the low-temperature superheater: delta T (low temperature superheater) ═ T (low temperature superheater) out -T (Low temperature superheater) in ；
Steam temperature rise of the platen superheater: delta T (platen superheater) ═ T (platen superheater) out -T (platen superheater) in ；
Steam temperature rise of the high-temperature superheater: delta T (high temperature superheater) ═ T (high temperature superheater) out -T (high temperature superheater) in ；
Temperature rise of steam of the low-temperature reheater: Δ T (low temperature reheater) ═ T (low temperature reheater) out -T (Low temperature reheater) in ；
Temperature rise of steam of the high-temperature reheater: Δ T (high temperature reheater) ═ T (high temperature reheater) out -T (high temperature reheater) in ；
3) Measuring the real-time load Pe of the boiler in real time;
4) obtaining the design steam temperature of each heating surface of each load section of the boiler, and calculating the design steam temperature of each heating surface when the boiler load is Pe by using an interpolation method according to the real-time load Pe of the boiler: design Water wall Inlet steam temperature T (Water wall) in ', design Water wall outlet steam temperature T (Water wall) out ', design of the Low temperature superheater Inlet steam temperature T (Low temperature superheater) in ', design of low temperature superheater outlet steam temperature T (Low temperature superheater) out ', design platen superheater inlet steam temperature T (platen superheater) in ', design platen superheater outlet steam temperature T (platen superheater) out ', design high temperature superheater inlet steam temperature T (high temperature superheater) in ', design high temperatureSteam temperature T at outlet of heater (high temperature superheater) out ', design Low temperature reheater Inlet steam temperature T (Low temperature reheater) in ', design Low temperature reheater Outlet steam temperature T (Low temperature reheater) out ', design high temperature reheater Inlet steam temperature T (high temperature reheater) in ', design high temperature reheater outlet steam temperature T (high temperature reheater) out ′；
5) Calculating the design temperature rise of each heating surface:
designing the steam temperature rise of the water wall: delta T (Water wall)' -T (Water wall) out ' -T (Water wall) in ′；
Designing the steam temperature rise of the low-temperature superheater: delta T (low temperature superheater)' -T (low temperature superheater) out ' -T (Low temperature superheater) in ′；
Designing the steam temperature rise of the platen superheater: delta T (platen superheater)' -T (platen superheater) out ' -T (platen superheater) in ′；
Designing the steam temperature rise of the high-temperature superheater: delta T (high temperature superheater)' -T (high temperature superheater) out ' -T (high temperature superheater) in ′；
Designing the steam temperature rise of a low-temperature reheater: Δ T (low temperature reheater)' ═ T (low temperature reheater) out ' -T (Low temperature reheater) in ′；
Designing the steam temperature rise of a high-temperature reheater: Δ T (high temperature reheater)' -T (high temperature reheater) out ' -T (high temperature reheater) in ′；
6) Comparing the difference between the actual value and the designed value of the steam temperature rise of each heating surface:
deviation of an actual value of the steam temperature rise of the water wall from a design value:
t (water wall) ═ Δ T (water wall) - Δ T (water wall)';
deviation of the actual steam temperature rise value of the low-temperature superheater from the design value:
t (low-temperature superheater) ═ Δ T (low-temperature superheater) - Δ T (low-temperature superheater)';
deviation of the actual value of the steam temperature rise of the platen superheater from the design value:
t (low-temperature superheater) ═ Δ T (low-temperature superheater) - Δ T (low-temperature superheater)';
deviation of the actual value of the steam temperature rise of the high-temperature superheater from the design value:
t (high temperature superheater) ═ Δ T (high temperature superheater) - Δ T (high temperature superheater)';
deviation of the actual value of the steam temperature rise of the low-temperature reheater from the design value:
t (low-temperature reheater) ═ Δ T (low-temperature reheater) - Δ T (low-temperature reheater)';
deviation of the actual value of the steam temperature rise of the high-temperature reheater from the design value:
t (high-temperature reheater) ═ Δ T (high-temperature reheater) - Δ T (high-temperature reheater)';
7) and judging the slagging and contamination conditions of all the heating surfaces.
2. The method for rapidly judging the slagging and contamination condition of the heating surface of the boiler according to claim 1, wherein in the step 1), the temperature rise of the steam temperature at the left side and the right side of the water wall, the low-temperature superheater, the platen superheater, the high-temperature superheater, the low-temperature reheater and the high-temperature reheater is compared with the deviation of the design value, so as to judge the slagging and contamination condition at the left side or the right side of the heating surface.
3. The method for rapidly judging the slag bonding and contamination condition of the heating surface of the boiler according to claim 1, wherein in the step 7), for the water-cooled wall of the once-through boiler:
if T (water wall) > -10 ℃, the water wall is slightly slagging and contamination, and soot blowing measures can be not considered;
if T (water-cooled wall) is more than or equal to 50 ℃ below zero and less than or equal to 10 ℃ below zero, the water-cooled wall is heavy in slag bonding and contamination, and soot blowing needs to be enhanced;
if T (water wall) is less than-50 ℃, soot blowing needs to be enhanced, and boiler combustion or coal blending is considered to be adjusted so as to reduce slagging and contamination of the water wall.
4. The method for rapidly judging the slag bonding contamination condition of the heating surface of the boiler as claimed in claim 1, wherein in the step 7), for the low-temperature superheater:
if T (low temperature superheater) is more than 0 ℃, slagging and contamination of the low temperature superheater are slight, and soot blowing measures can not be considered;
if T (low-temperature superheater) is more than or equal to minus 30 ℃ and less than or equal to 0 ℃, slagging, contamination or ash blockage of the low-temperature superheater are heavy, and soot blowing needs to be enhanced;
if T (low temperature superheater) is less than-30 ℃, soot blowing needs to be enhanced, and boiler combustion or coal blending is considered to be adjusted so as to reduce slagging, contamination and soot blockage of the low temperature superheater.
5. The method for rapidly judging the slagging contamination condition of the heating surface of the boiler according to the claim 1, characterized in that in the step 7), for the platen superheater:
if T (platen superheater) > -10 ℃, slagging and contamination of the platen superheater are slight, and soot blowing measures can not be considered;
if T (screen superheater) is more than or equal to minus 30 ℃ and less than or equal to minus 10 ℃, the screen superheater has heavy slagging and contamination, and soot blowing needs to be enhanced;
if T (platen superheater) is less than-30 ℃, soot blowing needs to be enhanced, and boiler combustion or coal blending is considered to be adjusted so as to reduce slagging and contamination of the platen superheater.
6. The method for rapidly judging the slag bonding contamination condition of the heating surface of the boiler according to the claim 1, characterized in that in the step 7), for the high-temperature superheater:
if T (high temperature superheater) is more than 0 ℃, slagging and contamination of the high temperature superheater are slight, and soot blowing measures can not be considered;
if T (high temperature superheater) is more than or equal to minus 30 ℃ and less than or equal to 0 ℃, slagging and contamination of the high temperature superheater are heavy, and soot blowing needs to be enhanced;
if T (high temperature superheater) is less than-30 ℃, soot blowing needs to be enhanced, and boiler combustion or coal blending is considered to be adjusted so as to reduce slagging and contamination of the high temperature superheater.
7. The method for rapidly judging the slag-bonding contamination condition of the heating surface of the boiler as claimed in claim 1, wherein in the step 7), for the low-temperature reheater:
if T (low-temperature reheater) > 0 ℃, slagging and contamination of the low-temperature reheater are slight, and soot blowing measures can not be considered;
if T (low-temperature reheater) is more than or equal to minus 30 ℃ and less than or equal to 0 ℃, the low-temperature reheater is heavy in slagging, contamination or ash blockage, and soot blowing needs to be enhanced;
if T (low-temperature reheater) is less than-30 ℃, soot blowing needs to be strengthened, and boiler combustion or coal blending is considered to be adjusted so as to reduce slagging, contamination and soot blockage of the low-temperature reheater.
8. The method for rapidly judging the slag-bonding contamination condition of the heating surface of the boiler as claimed in claim 1, wherein in the step 7), for the high-temperature reheater:
if T (high temperature reheater) > 0 ℃, the high temperature reheater is slightly slagging and contaminated, and soot blowing measures can not be considered;
if T (high temperature reheater) is more than or equal to minus 30 ℃ and less than or equal to 0 ℃, the high temperature reheater is heavy in slagging and contamination, and soot blowing needs to be enhanced;
if T (high temperature reheater) is less than-30 ℃, soot blowing needs to be enhanced, and boiler combustion or coal blending is considered to be adjusted so as to reduce slagging and contamination of the high temperature reheater.
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| US10415819B2 (en) * | 2016-04-05 | 2019-09-17 | The Babcock & Wilcox Company | High temperature sub-critical boiler with common steam cooled wall between furnace and convection pass |
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| CN101639412A (en) * | 2008-08-01 | 2010-02-03 | 中国神华能源股份有限公司 | Method for determining slagging prevention capacity of boiler by zoning |
| CN102798130A (en) * | 2012-09-07 | 2012-11-28 | 中国东方电气集团有限公司 | System for relieving scorification of convection heated surface of boiler |
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