A combustion system and method suitable for preventing high-temperature corrosion of tangentially-cut boilers

Abstract

The present invention provides a combustion system and method suitable for preventing high-temperature corrosion of a four-corner tangential boiler, comprising a wall burner, multiple primary air burners, multiple secondary air burners and an online water-cooled wall atmosphere testing device. The present invention monitors the reducing atmosphere data on the water-cooled wall during boiler operation, analyzes the areas of high reducing atmosphere on the water-cooled wall, and at the same time, increases the outer peripheral wind of the primary and secondary air burners in the corresponding area and the annular wind volume and pressure of the wall burner, thereby increasing the local oxidizing atmosphere on the corresponding water-cooled wall, thereby achieving the purpose of controlling and preventing high-temperature corrosion of the water-cooled wall; at the same time, in the system, the air volume of the primary and secondary air burners and the annular wind of the wall burner can be adjusted individually; at the same time, the pressure of the mixing air box can also be adjusted according to the ratio of the extracted primary and secondary air.

Description

Technical Field

[0001] The present invention belongs to the field of combustion technology optimization of coal-fired power generation units, and in particular relates to a combustion system and method suitable for preventing high-temperature corrosion of tangentially-shaped boilers. Background Art

[0002] The four-corner cut-circle boiler is the main type of furnace burning bituminous coal in my country. With the increase of sulfur and ash content of coal entering the furnace, the calorific value decreases, the large proportion of lean coal and anthracite is mixed and the air classification low-nitrogen transformation is carried out, the pulverized coal burns close to the wall and the high reducing atmosphere in the main combustion area leads to serious high-temperature corrosion of the water-cooled wall, which affects the safe operation of the boiler. Summary of the Invention

[0003] The present invention provides a combustion system and method suitable for preventing high-temperature corrosion of a square-tangentially-shaped boiler, which solves the above-mentioned shortcomings of the existing square-tangentially-shaped boiler.

[0004] In order to achieve the above object, the technical solution adopted in the present invention is:

[0005] The present invention provides a combustion system suitable for high-temperature corrosion protection of a tangentially-pivoted boiler. The four walls of the furnace of the tangentially-pivoted boiler are provided with wall-type burners. The four corners of the furnace are provided with multiple primary air burners and multiple secondary air burners. The multiple primary air burners and multiple secondary air burners are alternately stacked in a vertical direction.

[0006] The primary air burner includes two layers of peripheral air, namely an inner peripheral air and a first outer peripheral air, wherein the nozzle of the inner peripheral air is directed toward the primary air nozzle; the first outer peripheral air is arranged outside the inner peripheral air;

[0007] The air inlet of the secondary air burner is provided with a second peripheral air;

[0008] The wall burner, the first peripheral air inlet of the primary air burner and the second peripheral air inlet of the secondary air burner are all connected to a mixing wind box, and the air inlet of the mixing wind box is connected to a hot primary air duct and a hot secondary air duct;

[0009] The air inlet of the mixing air box, the air inlet of the wall burner, the first outer peripheral air inlet of the primary air burner and the second outer peripheral air inlet of the secondary air burner are all provided with a gas regulating unit, and each gas regulating unit is connected to the DCS main control system;

[0010] The DCS main control system is also connected to a water-cooled wall surface atmosphere online testing device, which is used to collect the flue gas atmosphere of the water-cooled wall surface in real time and transmit the collected flue gas atmosphere to the DCS main control system;

[0011] The DCS main control system is used to adjust the wind pressure and air volume of the primary air burner outer peripheral wind, the secondary air burner outer peripheral wind and the wall burner according to the received flue gas atmosphere.

[0012] Preferably, the gas regulating unit at the air inlet of the first outer peripheral air comprises an electric regulating door for the air volume of the outer peripheral air of the primary air burner, a measuring device for the air volume of the outer peripheral air of the primary air burner and a measuring device for the air pressure of the outer peripheral air of the primary air burner;

[0013] The electric regulating door for the peripheral air volume of the primary air burner, the peripheral air volume measuring device for the primary air burner and the peripheral air pressure measuring device for the primary air burner are all connected to the DCS main control system.

[0014] Preferably, the gas regulating unit corresponding to the second outer peripheral wind includes an electric regulating door for the air volume of the outer peripheral wind of the secondary air burner, a measuring device for the air volume of the outer peripheral wind of the secondary air burner, and a measuring device for the air pressure of the outer peripheral wind of the secondary air burner;

[0015] The electric regulating door of the secondary air burner outer peripheral air volume, the secondary air burner outer peripheral air volume measuring device and the secondary air burner outer peripheral air pressure measuring device are all connected to the DCS main control system.

[0016] Preferably, the gas regulating unit at the air inlet of the mixing bellows includes a mixing bellows inlet pressure measuring device and a mixing bellows inlet flow measuring device;

[0017] Among them, the mixing bellows inlet pressure measuring device and the mixing bellows inlet flow measuring device are both connected to the DCS main control system.

[0018] Preferably, an electric regulating door for extracting hot primary air is provided on the connecting pipe between the air inlet of the mixing air box and the hot primary air duct, and the electric regulating door for extracting hot primary air is connected to the DCS main control system.

[0019] Preferably, an electric regulating door for extracting hot secondary air is provided on the connecting pipe between the air inlet of the mixing air box and the hot secondary air duct, and the electric regulating door for extracting hot secondary air is connected to the DCS main control system.

[0020] Preferably, the gas regulating unit at the air inlet of the wall burner includes an electric regulating door for the annular air volume of the wall burner, a measuring device for the annular air volume of the wall burner, and a measuring device for the annular air pressure of the wall burner;

[0021] Among them, the wall-type burner annular air volume electric regulating door, the wall-type burner annular air volume measuring device and the wall-type burner annular air pressure measuring device are all connected to the DCS main control system.

[0022] Preferably, the water-cooled wall atmosphere online testing device includes a boiler water-cooled wall atmosphere sampler and a flue gas collection and analysis device, wherein a plurality of boiler water-cooled wall atmosphere samplers are provided, and the plurality of boiler water-cooled wall atmosphere samplers are arranged in a matrix structure on the water-cooled wall; the plurality of boiler water-cooled wall atmosphere samplers are all connected to the flue gas collection and analysis device, and the flue gas collection and analysis device is connected to the DCS main control system.

[0023] A combustion method for preventing high-temperature corrosion of a tangentially-intersected boiler, characterized in that, based on the combustion system for preventing high-temperature corrosion of a tangentially-intersected boiler, the method comprises the following steps:

[0024] Collect the flue gas on the water-cooled wall, analyze the gas components in the flue gas and calculate the corresponding values ​​of each gas component;

[0025] Collect the gas pressure and flow at the first outer peripheral air inlet of the wall burner, the primary air burner, and the second outer peripheral air inlet of the secondary air burner respectively;

[0026] The values ​​corresponding to each gas component are compared with the preset thresholds, and the gas pressure and flow at the air inlet of each burner are controlled based on the comparison results and the gas pressure and flow at the air inlet of each burner.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention provides a combustion system suitable for preventing high-temperature corrosion of a four-corner tangential boiler. The system actually monitors the reducing atmosphere data on the water-cooled wall surface during boiler operation and analyzes the areas of high reducing atmosphere on the water-cooled wall surface. At the same time, the air volume and air pressure of the outer peripheral air of the primary and secondary air burners and the annular air of the wall-type burners in the corresponding area are increased, thereby increasing the local oxidizing atmosphere on the corresponding water-cooled wall surface, thereby achieving the purpose of controlling and preventing high-temperature corrosion of the water-cooled wall. At the same time, in the system, the air volume of the outer peripheral air of the primary and secondary air burners and the annular air of the wall-type burners can be adjusted separately. At the same time, the pressure of the mixing air box can also be adjusted according to the ratio of the extracted primary and secondary air.

[0029] The present invention provides a combustion method suitable for preventing high-temperature corrosion of a four-corner tangential boiler. The method collects flue gas on a water-cooled wall and analyzes and calculates the numerical value corresponding to each gas component in the flue gas; the numerical value corresponding to each gas component is compared with a preset threshold value, and the analysis obtains the area with a higher reducing atmosphere on the wall surface. According to the comparison result, the gas pressure and flow at the air inlet of each burner are combined to control the gas pressure and flow at the air inlet of each burner. By increasing the pressure of the mixed hot air box, the pressure and air volume of the primary and secondary air burners in the corresponding area, the outer peripheral wind of the burner, and the wall-type annular wind, the local oxidizing atmosphere on the water-cooled wall is increased, thereby achieving the purpose of controlling and preventing high-temperature corrosion of the water-cooled wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of a combustion system of the present invention;

[0031] Figure 2 Schematic diagram of the water-cooled wall atmosphere online testing system of the present invention

[0032] Figure 3 This is a schematic diagram of the annular wind arrangement of a wall burner of the present invention;

[0033] Among them: 1. Primary air burner 2. Secondary air burner 3. Wall burner 4. Electric air volume adjustment door for primary air burner 5. Air volume measurement device for primary air burner 6. Air pressure measurement device for primary air burner 7. Electric air volume adjustment door for secondary air burner 8. Air volume measurement device for secondary air burner 9. Air pressure measurement device for secondary air burner 910. Mixing air box 11. Mixing air box inlet pressure measurement device 12. Combined air box inlet flow measuring device 13, electric regulating door for extracting hot primary air 14, electric regulating door for extracting hot secondary air 15, boiler water-cooled wall atmosphere sampler 16, flue gas collection and analysis device 17, electric regulating door for the annular air volume of wall burner 18, annular air volume measuring device for wall burner 19, annular air pressure measuring device for wall burner 20, primary air hot air duct 21, secondary air hot air duct 101, inner peripheral air 102, first outer peripheral air 201, second outer peripheral air. DETAILED DESCRIPTION

[0034] In order to further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose of the invention, the following specific implementation methods, structures, features and functions of the present invention are proposed in conjunction with the accompanying drawings, and the detailed description is as follows.

[0035] like Figure 1 As shown, the present invention provides a combustion system suitable for preventing high-temperature corrosion of a four-corner tangential boiler, comprising a primary air burner 1, a secondary air burner 2, a wall burner 3 and an online testing device for the atmosphere of a water-cooled wall, wherein wall burners are provided on the four walls of the furnace, and the air inlet of the wall burner is an annular structure; the air inlet of the annular structure is used to increase the oxidizing atmosphere of the water-cooled wall, prevent and reduce the high-temperature corrosion of the water-cooled wall, and prevent unburned coal powder particles from staying in the water-cooled wall area.

[0036] A plurality of primary air burners 1 and a plurality of secondary air burners 2 are arranged at the four corners of the furnace. The plurality of primary air burners 1 and the plurality of secondary air burners 2 are alternately stacked in a vertical direction at the four corners of the boiler.

[0037] The water-cooled wall atmosphere online testing device is used to collect the flue gas atmosphere of the water-cooled wall in real time and transmit the collected flue gas atmosphere to the DCS main control system; the DCS main control system is used to adjust the wind pressure and air volume of the first outer peripheral wind 102 of the primary air burner, the second outer peripheral wind 201 of the secondary air burner, and the annular wind of the wall burner according to the received flue gas atmosphere.

[0038] The primary air burner 1 includes two layers of peripheral wind, namely the inner peripheral wind 101 and the first outer peripheral wind 102, wherein the nozzle of the inner peripheral wind 101 is directed toward the primary air nozzle, and is used to cool the primary air nozzle to prevent the primary air nozzle from overheating and deformation, while enhancing the rigidity of the primary air and preventing airflow deflection; the first outer peripheral wind 102 is arranged on the outside of the inner peripheral wind 101, and is used to increase the oxidizing atmosphere in the water-cooled wall surface while preventing coal powder particles from scouring the water-cooled wall wall.

[0039] The air inlet of the secondary air burner 2 is provided with a second peripheral air 201, and the second peripheral air 201 is used to increase the oxidizing atmosphere of the water-cooled wall surface to prevent and reduce high-temperature corrosion of the water-cooled wall.

[0040] The air inlets of the first peripheral air of the primary air burner 102 , the second peripheral air of the secondary air burner 201 and the wall burner are all connected to the mixing air box 10 , and the air inlet of the mixing air box 10 is connected to the hot primary air duct 20 and the hot secondary air duct 21 .

[0041] The connecting pipe between the hot primary air duct 20 and the mixing air box 10 is provided with an electric regulating door 13 for extracting the hot primary air.

[0042] The connecting pipe between the hot secondary air duct 21 and the mixing air box 10 is provided with an electric regulating door 14 for extracting hot secondary air.

[0043] The air inlet of the mixing bellows 10 is provided with a mixing bellows inlet pressure measuring device 11 and a mixing bellows inlet flow measuring device 12, which are respectively used to collect the gas pressure and flow entering the mixing bellows 10 and transmit the collected gas pressure and flow to the DCS main control system.

[0044] The mixing air box 10 is provided with multiple air outlets, each of which is connected to a burner, wherein the connecting pipe between the mixing air box 10 and the second outer peripheral air 201 air inlet of the secondary air burner 2 is provided with a secondary air burner outer peripheral air volume electric adjustment door 7, a secondary air burner outer peripheral air volume measuring device 8 and a secondary air burner outer peripheral wind pressure measuring device 9.

[0045] The connecting pipe between the mixing wind box 10 and the air inlet of the first peripheral wind 102 of the primary air burner 1 is provided with an electric regulating door 4 for the peripheral wind volume of the primary air burner, a measuring device 5 for the peripheral wind volume of the primary air burner and a measuring device 6 for the peripheral wind pressure of the primary air burner.

[0046] The connecting pipe between the mixing wind box 10 and the wall burner 3 is provided with a wall burner annular air volume electric regulating door 17, a wall burner annular air volume measuring device 18 and a wall burner annular air pressure measuring device 19.

[0047] The water-cooled wall atmosphere online testing device includes a boiler water-cooled wall atmosphere sampler 15 and a flue gas collection and analysis device 16, wherein a plurality of boiler water-cooled wall atmosphere samplers 15 are provided, and the plurality of boiler water-cooled wall atmosphere samplers 15 are arranged in a matrix structure on the water-cooled wall; the plurality of boiler water-cooled wall atmosphere samplers 15 are all connected to the flue gas collection and analysis device 16, and the flue gas collection and analysis device 16 is connected to the DCS main control system.

[0048] The boiler water-cooled wall atmosphere sampler 15 is used to extract the flue gas on the water-cooled wall surface and transmit the extracted flue gas to the flue gas collection and analysis device 16 .

[0049] The flue gas collection and analysis device 16 is used to analyze the gas composition of the received flue gas and transmit the analysis results to the DCS main control system.

[0050] The DCS main control system is also connected to a display screen, an electric regulating door for extracting hot primary air 13, an electric regulating door for extracting hot secondary air 14, a mixing air box inlet pressure measuring device 11, a mixing air box inlet flow measuring device 12, an electric regulating door for the outer peripheral air volume of the secondary air burner 7, a secondary air burner outer peripheral air volume measuring device 8, a secondary air burner outer peripheral air pressure measuring device 9, an electric regulating door for the outer peripheral air volume of the primary air burner 4, a primary air burner outer peripheral air volume measuring device 5, a primary air burner outer peripheral wind pressure measuring device 6, an electric regulating door for the annular air volume of the wall burner 17, a wall burner annular air volume measuring device 18 and a wall burner annular wind pressure measuring device 19.

[0051] The working process of the present invention is:

[0052] The hot air is extracted from the hot primary air duct 20 and the hot secondary air duct 21 respectively and enters the mixing air box 10. According to the real-time values ​​of the mixing air box inlet pressure measuring device 11 and the mixing air box inlet flow measuring device 12, the air volume and air pressure of the hot air in the mixing air box are adjusted by extracting the hot primary air electric regulating door 13 and the hot secondary air electric regulating door 14.

[0053] The first peripheral air 102 of the primary air burner 1 , the second peripheral air 201 of the secondary air burner 2 and the air supply to the wall burner 3 all come from the mixing air box 10 .

[0054] The wind pressure and air volume of the first peripheral wind 102 of the primary air burner 1 are adjusted through the primary air burner peripheral wind volume electric adjustment door 4 based on the real-time values ​​of the primary air burner peripheral wind volume measuring device 5 and the primary air burner peripheral wind pressure measuring device 6.

[0055] The wind pressure and air volume of the second peripheral wind 201 of the secondary air burner 2 are adjusted through the secondary air burner peripheral wind volume electric adjustment door 7 based on the real-time values ​​of the secondary air burner peripheral wind volume measuring device 8 and the secondary air burner peripheral wind pressure measuring device 9.

[0056] The wind pressure and air volume of the wall burner 3 are adjusted by the wall burner annular air volume electric regulating door 17 based on the real-time values ​​of the wall burner annular air volume measuring device 18 and the wall burner annular air pressure measuring device 19.

[0057] The wind pressure and air volume of the first peripheral wind 102 of each primary air burner 1, the second peripheral wind 201 of the secondary air burner 2 and the wall burner 3 can be adjusted and controlled individually. At the same time, the wind volume and air pressure of the hot air in the mixing wind box 10 can also be adjusted and controlled.

[0058] During the actual operation of the boiler, the water-cooled wall flue gas that needs to be monitored is sampled and extracted through the matrix-structured boiler water-cooled wall atmosphere sampler 15. The extracted flue gas is analyzed for gas composition through the flue gas collection and analysis device 16, and the data is transmitted to the DCS in real time, and then transmitted to the display screen. The operating staff analyzes the test data information monitored in real time to find the area with high reducing atmosphere on the water-cooled wall, and simultaneously confirm the conditions of the primary air burner, secondary air burner and wall burner in the relevant area.

[0059] According to the real-time values ​​of the primary air burner outer peripheral wind volume measuring device 5 and the primary air burner outer peripheral wind pressure measuring device 6, the wind pressure and air volume of the first outer peripheral wind 102 of the primary air burner 1 in the relevant area are adjusted and opened by the primary air burner outer peripheral wind volume electric regulating door 4.

[0060] According to the real-time values ​​of the secondary air burner outer peripheral wind volume measuring device 8 and the secondary air burner outer peripheral wind pressure measuring device 9, the wind pressure and air volume of the second outer peripheral wind 201 of the secondary air burner 2 in the relevant area are adjusted and opened by the secondary air burner outer peripheral wind volume electric adjustment door 7.

[0061] According to the real-time values ​​of the wall burner air volume measuring device 18 and the wall burner annular wind pressure measuring device 19, the air pressure and air volume of the wall burners in the relevant area are adjusted and opened by the wall burner annular wind volume electric regulating door 17.

[0062] If the air volume and air pressure of the mixing bellows 10 are too small, they can be opened by adjusting the hot primary air extraction electric regulating door 13 and the hot secondary air extraction electric regulating door 14 according to the real-time values ​​of the mixing bellows inlet pressure measuring device 11 and the mixing bellows inlet flow measuring device 12.

[0063] After the operation is completed, observe the measured data value of the high-reducing atmosphere on the water-cooled wall of the dial. When the value is within the normal range, the adjustment work is completed; when the value is outside the normal range, continue the above adjustment work process until it is qualified.

[0064] Using the above method, operators can monitor data in real time, make timely adjustments and optimizations to areas with high reducing atmosphere on the water-cooled wall, increase the local oxidizing atmosphere on the water-cooled wall, and achieve the purpose of controlling and preventing high-temperature corrosion of the water-cooled wall.

Claims

1. A combustion system suitable for high temperature corrosion protection of tangentially fired boilers, characterized in that: Wall burners (3) are provided on the four walls of the four-corner tangential boiler furnace; a plurality of primary air burners (1) and a plurality of secondary air burners (2) are arranged at the four corners of the furnace, and the plurality of primary air burners (1) and the plurality of secondary air burners (2) are alternately stacked in a vertical direction; The primary air burner (1) comprises two layers of peripheral air, namely an inner peripheral air (101) and a first outer peripheral air (102), wherein the nozzle of the inner peripheral air (101) faces the primary air nozzle; and the first outer peripheral air (102) is arranged outside the inner peripheral air (101); A second outer peripheral air (201) is provided at the air outlet of the secondary air burner (2); The air inlets of the wall burner (3), the first peripheral air (102) of the primary air burner (1), and the second peripheral air (201) of the secondary air burner (2) are all connected to a mixing air box (10), and the air inlet of the mixing air box (10) is connected to a hot primary air duct (20) and a hot secondary air duct (21); The air inlet of the mixing air box (10), the air inlet of the wall burner (3), the first peripheral air inlet (102) of the primary air burner (1), and the second peripheral air inlet (201) of the secondary air burner (2) are all provided with a gas regulating unit, and each gas regulating unit is connected to the DCS main control system; The DCS main control system is also connected to a water-cooled wall surface atmosphere online testing device, which is used to collect the flue gas atmosphere of the water-cooled wall surface in real time and transmit the collected flue gas atmosphere to the DCS main control system; The DCS main control system is used to adjust the air volume and air pressure of the outer peripheral air (102) of the primary air burner (1), the outer peripheral air (102) of the secondary air burner (2), and the wall burner (3) according to the received flue gas atmosphere; the gas regulating unit at the air inlet of the first outer peripheral air (102) includes an electric regulating door (4) for the air volume of the outer peripheral air of the primary air burner, a measuring device (5) for the air volume of the outer peripheral air of the primary air burner, and a measuring device (6) for the air pressure of the outer peripheral air of the primary air burner; The primary air burner outer peripheral wind volume electric regulating door (4), the primary air burner outer peripheral wind volume measuring device (5), and the primary air burner outer peripheral wind pressure measuring device (6) are all connected to the DCS main control system; the gas regulating unit corresponding to the second outer peripheral wind (201) includes a secondary air burner outer peripheral wind volume electric regulating door (7), the secondary air burner outer peripheral wind volume measuring device (8), and the secondary air burner outer peripheral wind pressure measuring device (9); The electric regulating door (7) for the air volume of the peripheral air of the secondary air burner, the air volume measuring device (8) for the peripheral air of the secondary air burner, and the air pressure measuring device (9) for the peripheral air of the secondary air burner are all connected to the DCS main control system.

2. A combustion system for high temperature corrosion protection of tangentially-cut boilers according to claim 1, characterized in that: The gas regulating unit at the air inlet of the mixing bellows (10) comprises a mixing bellows inlet pressure measuring device (11) and a mixing bellows inlet flow measuring device (12); The mixing bellows inlet pressure measuring device (11) and the mixing bellows inlet flow measuring device (12) are both connected to the DCS main control system.

3. The combustion system for high temperature corrosion protection of tangentially-cut boilers according to claim 1, characterized in that: An electric regulating door (13) for extracting hot primary air is provided on the connecting pipe between the air inlet of the mixing air box (10) and the hot primary air duct (20), and the electric regulating door (13) for extracting hot primary air is connected to the DCS main control system.

4. The combustion system for high temperature corrosion protection of tangentially-cut boilers according to claim 1 is characterized in that: An electric regulating door (14) for extracting hot secondary air is provided on the connecting pipe between the air inlet of the mixing air box (10) and the hot secondary air duct (21), and the electric regulating door (14) for extracting hot secondary air is connected to the DCS main control system.

5. The combustion system for high temperature corrosion protection of tangentially-cut boilers according to claim 1 is characterized in that: The gas regulating unit at the air inlet of the wall burner (3) comprises a wall burner annular air volume electric regulating door (17), a wall burner annular air volume measuring device (18) and a wall burner annular air pressure measuring device (19); The wall burner annular air volume electric regulating door (17), the wall burner annular air volume measuring device (18) and the wall burner annular air pressure measuring device (19) are all connected to the DCS main control system.

6. The combustion system for high temperature corrosion protection of tangentially-cut boilers according to claim 1, characterized in that: The water-cooled wall surface atmosphere online testing device comprises a boiler water-cooled wall surface atmosphere sampler (15) and a flue gas collection and analysis device (16), wherein a plurality of boiler water-cooled wall surface atmosphere samplers (15) are provided, and the plurality of boiler water-cooled wall surface atmosphere samplers (15) are arranged on the water-cooled wall surface in a matrix structure; the plurality of boiler water-cooled wall surface atmosphere samplers (15) are all connected to the flue gas collection and analysis device (16), and the flue gas collection and analysis device (16) is connected to a DCS main control system.

7. A combustion method suitable for preventing high temperature corrosion of tangentially fired boilers, characterized in that: A combustion system for preventing high-temperature corrosion of a tangentially-intersecting boiler according to any one of claims 1 to 6 comprises the following steps: Collect the flue gas on the water-cooled wall, analyze the gas components in the flue gas and calculate the corresponding values ​​of each gas component; Collect the gas pressure and flow at the first outer peripheral air inlet of the wall burner, the primary air burner, and the second outer peripheral air inlet of the secondary air burner respectively; The corresponding values ​​of each gas component are compared with the preset threshold value. According to the comparison results, the gas pressure and flow at the air inlet of each burner are combined to control the gas pressure and flow at the air inlet of each burner, reduce the reducing components of the flue gas on the boiler wall, and achieve the purpose of controlling the high-temperature corrosion of the boiler water-cooled wall.

Images