CN113446594B - Method capable of rapidly judging slag bonding and contamination conditions of boiler heating surface - Google Patents

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

A method that can quickly judge the slag contamination on the heating surface of the boiler

technical field

The invention belongs to the field of power generation, and in particular relates to a method for quickly judging the slag contamination on the heating surface of a boiler.

Background technique

The slagging and fouling of the heating surface of the coal-fired boiler is an inevitable phenomenon during the operation of the boiler, and it is one of the main reasons for accidents such as temperature deviation, tube burst, and over-temperature of the boiler. Therefore, the slagging and fouling of the heating surface of the boiler Monitoring is a very important link in the boiler operation process. Usually, the monitoring of slagging and contamination on the heating surface of the boiler is to open fire viewing holes in the boiler furnace wall, and manually observe the slagging and contamination of the heating surface. This method has great limitations and can only observe the local position. slagging and contamination.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a method for quickly judging the slagging and contamination of the heating surface of the boiler, the method does not require equipment modification of the existing boiler or only needs to carry out minor modification, the cost is low, and the method can quickly judge that the boiler is mainly heated Slag and contamination on the surface.

The present invention adopts following technical scheme to realize:

A method for quickly judging the slag contamination on the heating surface of a boiler, comprising the following steps:

1) Real-time measurement of water wall inlet steam temperature T (water wall) _in , water wall outlet steam temperature T (water wall) _out , low temperature superheater inlet steam temperature T (low temperature superheater) _in , low temperature superheater outlet steam temperature T ( Low temperature superheater) _out , screen superheater inlet steam temperature T (screen superheater) _in , 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) Calculate the temperature rise of each heating surface:

Water-cooled wall steam temperature rise: ΔT (water-cooled wall)=T (water-cooled wall) _out -T (water-cooled wall) _in ;

Low temperature superheater steam temperature rise: ΔT (low temperature superheater)=T (low temperature superheater) _out -T (low temperature superheater) _in ;

The steam temperature rise of the panel superheater: ΔT (panel superheater) = T (panel superheater) _out - T (panel superheater) _in ;

High temperature superheater steam temperature rise: ΔT (high temperature superheater) = T (high temperature superheater) _out - T (high temperature superheater) _in ;

Low temperature reheater steam temperature rise: ΔT (low temperature reheater)=T (low temperature reheater) _out -T (low temperature reheater) _in ;

High temperature reheater steam temperature rise: ΔT (high temperature reheater)=T (high temperature reheater) _out -T (high temperature reheater) _in ;

3) Real-time measurement of boiler real-time load Pe;

4) Obtain the design steam temperature of each heating surface of each load section of the boiler, and use the interpolation method to calculate the design steam temperature of each heating surface when the boiler load is Pe: design water wall inlet steam temperature T (water wall) _in ', design water wall outlet steam temperature T (water wall) _out ', design low temperature superheater inlet steam temperature T (low temperature superheater) _in ', design low temperature superheater outlet steam temperature T (low temperature superheater) _out ', design The inlet steam temperature T of the panel superheater (panel superheater) _in ', the designed outlet steam temperature T of the panel superheater (panel superheater) _out ', the 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 ', the designed high temperature reheater inlet steam temperature T (high temperature reheater) _in ', the designed high temperature reheater outlet steam temperature T (high temperature reheater) _out ';

5) Calculate the design temperature rise of each heating surface:

Design water cooling wall steam temperature rise: ΔT (water cooling wall)′=T (water cooling wall) _out ′-T (water cooling wall) _in ′;

Design low temperature superheater steam temperature rise: ΔT (low temperature superheater)'=T (low temperature superheater) _out '-T (low temperature superheater) _in ';

Design panel superheater steam temperature rise: ΔT (panel superheater) '=T (panel superheater) _out '-T (panel superheater) _in ';

Design high temperature superheater steam temperature rise: ΔT (high temperature superheater)'=T (high temperature superheater) _out '-T (high temperature superheater) _in ';

Design low temperature reheater steam temperature rise: ΔT (low temperature reheater)'=T (low temperature reheater) _out '-T (low temperature reheater) _in ';

Design high temperature reheater steam temperature rise: ΔT (high temperature reheater)'=T (high temperature reheater) _out '-T (high temperature reheater) _in ';

6) Compare the difference between the actual value of the steam temperature rise of each heating surface and the design value:

Deviation between the actual value of the steam temperature rise of the water wall and the design value:

T (water wall) = ΔT (water wall) - ΔT (water wall)';

The deviation between the actual value of the steam temperature rise of the low temperature superheater and the design value:

T (low temperature superheater) = ΔT (low temperature superheater) - ΔT (low temperature superheater)';

Deviation between the actual value of the steam temperature rise of the screen superheater and the design value:

T (low temperature superheater) = ΔT (low temperature superheater) - ΔT (low temperature superheater)';

Deviation between the actual value of the steam temperature rise of the high temperature superheater and the design value:

T (high temperature superheater) = ΔT (high temperature superheater) - ΔT (high temperature superheater)';

The deviation between the actual value of the steam temperature rise of the low temperature reheater and the design value:

T (low temperature reheater) = ΔT (low temperature reheater) - ΔT (low temperature reheater)';

Deviation between the actual value of the steam temperature rise of the high temperature reheater and the design value:

T (high temperature reheater) = ΔT (high temperature reheater) - ΔT (high temperature reheater)';

7) Judge the slagging and contamination of each heating surface.

A further improvement of the present invention is that, in step 1), the deviation of the temperature rise of the steam temperature on the left and right sides of the water-cooled wall, the low-temperature superheater, the panel superheater, the high-temperature superheater, the low-temperature reheater, and the left and right sides of the high-temperature reheater from the design value is compared respectively. , so as to judge the slag contamination on the left or right side of the heating surface.

A further improvement of the present invention is that, in step 7), for the water wall of the once-through furnace:

If T (water wall)>-10℃, the water wall is slightly slagging and fouling, so soot blowing measures may not be considered;

If -50°C≤T (water wall)≤-10°C, the water wall is heavily slagging and fouled, and soot blowing needs to be strengthened;

If T (water wall) <-50°C, soot blowing should be strengthened, and at the same time, consideration should be given to adjusting boiler combustion or coal blending to reduce slagging and fouling of water wall.

A further improvement of the present invention is that, in step 7), for the low temperature superheater:

If T (low temperature superheater) > 0 ℃, the low temperature superheater is slightly slagging and fouling, and soot blowing measures may not be considered;

If -30℃≤T (low temperature superheater)≤0℃, the low temperature superheater is slagging, fouled or blocked, and soot blowing needs to be strengthened;

If T (low temperature superheater) <-30 ℃, it is necessary to strengthen soot blowing, and consider adjusting boiler combustion or coal blending to reduce slagging, fouling and ash blocking of low temperature superheater.

A further improvement of the present invention is that, in step 7), for the panel superheater:

If T (screen superheater)>-10℃, the screen superheater has slight slagging and contamination, and soot blowing measures may not be considered;

If -30℃≤T (panel superheater)≤-10℃, the screen superheater is slagging and heavily polluted, and soot blowing needs to be strengthened;

If T (panel superheater) <-30 ℃, it is necessary to strengthen soot blowing, and consider adjusting the boiler combustion or coal blending to reduce the slagging and fouling of the panel superheater.

A further improvement of the present invention is that, in step 7), for the high temperature superheater:

If T (high temperature superheater) > 0 ℃, the high temperature superheater is slightly slagging and fouling, so soot blowing measures may not be considered;

If -30°C≤T (high temperature superheater)≤0°C, the high temperature superheater is slagging and heavily contaminated, and soot blowing needs to be strengthened;

If T (high temperature superheater) <-30 ℃, it is necessary to strengthen soot blowing, and consider adjusting the boiler combustion or coal blending to reduce the slagging and fouling of the high temperature superheater.

A further improvement of the present invention is that, in step 7), for the low temperature reheater:

If T (low temperature reheater) > 0°C, the low temperature reheater has slight slagging and fouling, and soot blowing measures may not be considered;

If -30℃≤T (low temperature reheater)≤0℃, the low temperature reheater is slagging, fouled or blocked, and soot blowing needs to be strengthened;

If T (low temperature reheater) <-30℃, soot blowing should be strengthened, and at the same time consider adjusting boiler combustion or coal blending to reduce slagging, fouling and ash blocking of low temperature reheater.

A further improvement of the present 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 fouling, and soot blowing measures may not be considered;

If -30℃≤T (high temperature reheater)≤0℃, the high temperature reheater is slagging and heavily contaminated, and soot blowing needs to be strengthened;

If T (high temperature reheater) <-30℃, soot blowing should be strengthened, and at the same time consider adjusting boiler combustion or coal blending to reduce slagging and fouling of high temperature reheater.

The present invention at least has the following beneficial technical effects:

1. There is no need to carry out equipment modification or minor modification to the existing boiler, and the investment is low;

2. In the absence of other judgment measures, it is possible to quickly predict the slagging and contamination of the heating surface of the boiler, and take measures to improve the safety of boiler operation.

Detailed ways

The present invention will be further described below in conjunction with the embodiments.

(1) A 660MW ultra-supercritical once-through boiler unit in a power plant uses coal that is easy to slagging. When the boiler load is 550MW, the dial shows the steam temperature in the following table:

According to the above table, calculate the temperature rise of each heating surface:

Water wall steam temperature rise: ΔT (water wall) = T (water wall) _out -T (water wall) _in = 111℃

Low temperature superheater steam temperature rise: ΔT (low temperature superheater) = T (low temperature superheater) _out -T (low temperature superheater) _in = 79.5°C;

The steam temperature rise of the panel superheater: ΔT (panel superheater) = T (panel superheater) _out -T (panel superheater) _in = 45.5°C;

High temperature superheater steam temperature rise: ΔT (high temperature superheater) = T (high temperature superheater) _out - T (high temperature superheater) _in = 42.5℃;

Low temperature reheater steam temperature rise: ΔT (low temperature reheater) = T (low temperature reheater) _out -T (low temperature reheater) _in = 140.5°C;

High temperature reheater steam temperature rise: ΔT (high temperature reheater) = T (high temperature reheater) _out -T (high temperature reheater) _in = 74.5°C:

(2) Check the design base steam temperature of each position when the boiler is 660MW and 495MW, see the table below.

Use interpolation to calculate the design steam temperature at each location at 550MW, see the table below.

name symbol unit design value Design water wall inlet steam temperature at 550MW T(water wall)_in′ °C 287.5 Design water wall outlet steam temperature at 550MW T(water wall)_out′ °C 428.0 Design low temperature superheater inlet steam temperature at 550MW T(low temperature superheater)_in′ °C 428.0 Design low temperature superheater outlet steam temperature at 550MW T(low temperature superheater)_out′ °C 491.7 The inlet steam temperature of the design screen superheater at 550MW T (screen superheater)_in′ °C 488.3 The outlet steam temperature of the design panel superheater at 550MW T (screen superheater)_out′ °C 568.0 The inlet steam temperature of the designed high temperature superheater at 550MW T (high temperature superheater)_in′, °C 543.7 Design high temperature superheater outlet steam temperature at 550MW T (high temperature superheater)_out′ °C 605.0 Design low temperature reheater inlet steam temperature at 550MW T(low temperature reheater)_in′ °C 362.3 Design low temperature reheater outlet steam temperature at 550MW T(low temperature reheater)_out′ °C 508.3 Design high temperature reheater inlet steam temperature at 550MW T(High temperature reheater)_in′ °C 508.3 Design high temperature reheater outlet steam temperature at 550MW T(High temperature reheater)_out′ °C 603.0

Calculate the design temperature rise of each heating surface:

Design water cooling wall steam temperature rise: ΔT (water cooling wall)'=T (water cooling wall) _out '-T (water cooling wall) _in '=140.5℃;

Design low temperature superheater steam temperature rise: ΔT (low temperature superheater)'=T (low temperature superheater) _out '-T (low temperature superheater) _in '=63.7℃;

Design panel superheater steam temperature rise: ΔT (panel superheater)′=T (panel superheater) _out ′-T (panel superheater) _in ′=79.7℃;

Design high temperature superheater steam temperature rise: ΔT (high temperature superheater)′=T (high temperature superheater) _out ′-T (high temperature superheater) _in ′=61.3℃;

Design low temperature reheater steam temperature rise: ΔT (low temperature reheater)′=T (low temperature reheater) _out ′-T (low temperature reheater) _in ′=146℃;

Design high temperature reheater steam temperature rise: ΔT (high temperature reheater)′=T (high temperature reheater) _out ′-T (high temperature reheater) _in ′=94.7℃;

3) Compare the difference between the actual value and the design value of the steam temperature rise of each heating surface:

Deviation between the actual value of the steam temperature rise of the water wall and the design value:

T(water wall)=ΔT(water wall)-ΔT(water wall)′=-29.5℃;

The deviation between the actual value of the steam temperature rise of the low temperature superheater and the design value:

T (low temperature superheater)=ΔT (low temperature superheater)-ΔT (low temperature superheater)′=-15.8℃;

Deviation between the actual value of the steam temperature rise of the screen superheater and the design value:

T(low temperature superheater)=ΔT(low temperature superheater)-ΔT(low temperature superheater)′=-34.2℃;

Deviation between the actual value of the steam temperature rise of the high temperature superheater and the design value:

T (high temperature superheater)=ΔT (high temperature superheater)-ΔT (high temperature superheater)′=-18.8℃;

The deviation between the actual value of the steam temperature rise of the low temperature reheater and the design value:

T (low temperature reheater) = ΔT (low temperature reheater) - ΔT (low temperature reheater)' = -6°C;

Deviation between the actual value of the steam temperature rise of the high temperature reheater and the design value:

T (high temperature reheater)=ΔT (high temperature reheater)-ΔT (high temperature reheater)′=-20.2℃;

7) Judging the slagging and contamination of each heating surface according to the following:

For water-cooled wall: T (water-cooled wall) = -15.8 ℃, the water-cooled wall is heavily slagging and fouled, so it is necessary to strengthen soot blowing;

For the low temperature superheater: T (low temperature superheater) = -15.8 ℃, the low temperature superheater is heavy with slagging, fouling or ash blocking, and soot blowing needs to be strengthened;

For the panel superheater: T (panel superheater) = -31.2 ℃, the panel superheater is slagging and heavily contaminated, so it is necessary to strengthen soot blowing;

For the high temperature superheater: T (high temperature superheater) = -18.8℃, the high temperature superheater is slagging and fouling is heavy, so it is necessary to strengthen soot blowing;

For the low temperature reheater: T (low temperature reheater) = -6℃, the low temperature reheater is heavy with slagging, fouling or ash blocking, so it is necessary to strengthen the soot blowing;

For the high temperature reheater: T (high temperature reheater) = -20.2°C>, the high temperature reheater is slagging and heavily polluted, so it is necessary to strengthen soot blowing.

According to the above judgment, the boiler's low temperature reheater, screen superheater, high temperature reheater, water wall, low temperature superheater and high temperature superheater are all seriously slagging or fouled. Or the contamination situation is consistent with the judgment result, the operator took measures such as strengthening soot blowing, and mixed some high-ash melting point coals with the coal into the furnace, so that the slagging and contamination of the heating surface will not be further Deterioration ensures the safe operation of the boiler.

Although the present invention has been described in detail above with general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention fall within the scope of the claimed protection of the present invention.

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.