New sensor-based furnace air sootblower

Abstract

The present invention belongs to the technical field of boilers, and specifically relates to a new type of sensing furnace air soot blower; the technical solution adopted is: comprising a cylinder and an end baffle installed on the nozzle side of the cylinder through a bracket; the end baffle is connected to a plurality of sensing measuring points, a hollow cavity is arranged inside the end baffle, a plurality of rotating blade groups are installed on the hollow cavity, an air outlet and an air inlet communicating with the hollow cavity are respectively arranged on both sides of the end baffle, one end of the air inlet is connected to a cooling air duct, and the cooling air duct is arranged through the cylinder; the upper end of the cylinder away from the nozzle side is connected to a primary air duct and a secondary air duct. The present invention uses a set of systems to achieve two purposes, simplifies the process, and saves construction costs; and adopts the method of setting measuring points at the baffle, thereby greatly improving the safety and stability of the unit operation.

Description

Technical Field

[0001] The invention belongs to the technical field of boilers, and in particular relates to a novel sensing furnace air soot blower. Background Art

[0002] The water-cooled wall is the main heat-receiving part of the boiler. It is composed of several rows of steel pipes and is usually laid vertically on the inner wall of the furnace. It has flowing water or steam inside. It is the heating surface of the boiler mainly used to absorb the radiant heat released by the flame and high-temperature flue gas in the furnace.

[0003] In recent years, due to environmental protection policies, market supply and demand, and other reasons, coal prices have risen, power generation costs have risen, and thermal power operation costs are high. In order to improve economic benefits, power generation companies have adopted measures such as burning inferior coal and mixing coal sludge to reduce fuel costs, but there have also been serious coking of boiler water and large-scale high-temperature corrosion of water-cooled walls. For coal with high sulfur, high alkali metal content, and low ash melting point, high-temperature coke is easily formed on the water-cooled wall, and the use of steam soot blowers is not effective in removing high-temperature coke. The high-temperature flue gas generated by combustion in the furnace flows in a certain direction. The water-cooled wall facing the high-temperature flue gas has more ash accumulation, and the water-cooled wall away from the high-temperature flue gas has less ash accumulation. The steam flow rate at the outlet of the steam soot blower is high, which can easily cause the water-cooled wall surface with less ash accumulation to be easily worn and thinned. Summary of the invention

[0004] The present invention overcomes the deficiencies of the prior art and provides a novel sensing furnace air soot blower.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a new type of sensing furnace air soot blower, comprising a cylinder and an end baffle installed on the nozzle side of the cylinder through a bracket;

[0006] The end baffle is connected to a plurality of sensing points, a hollow cavity is arranged inside the end baffle, a plurality of rotating blade groups are installed on the hollow cavity, an air outlet and an air inlet communicating with the hollow cavity are arranged on both sides of the end baffle, one end of the air inlet is connected to a cooling air duct, and the cooling air duct is arranged through the cylinder;

[0007] The upper end of the cylinder away from the nozzle is connected with a primary air duct and a secondary air duct.

[0008] A glass window is provided at the observation end of the cylinder, a purge air duct is installed on the glass window, and the other end of the purge air duct passes through the cylinder and is connected to the purge box.

[0009] The nozzle side of the cylinder extends out of the water-cooled wall, and the nozzle side is used for outputting purge air.

[0010] The multiple sensing measurement points are respectively a flue gas temperature measurement point, a water-cooled wall dust accumulation observation point and an oxygen measurement point. The oxygen side point is connected to a flue gas sampling tube, which runs through the cooling air duct and is provided with a switch valve.

[0011] A flue gas sealing box is arranged around the cylinder, and the flue gas sealing box is arranged in close contact with the water-cooled wall.

[0012] There are multiple air outlets, and each of the air outlets is a truncated cone structure.

[0013] When the oxygen content in the water-cooled wall is monitored by the oxygen measurement point to be lower than 0.5%, the air volume needs to be increased to make the oxygen content greater than 1% to ensure that the water-cooled wall area is in an oxidizing atmosphere.

[0014] The flue gas temperature measuring point detects the flue gas temperature of the water-cooled wall. If the flue gas temperature is greater than 1200°C, it indicates that the carbon particles are not completely burned, and it is necessary to adjust the operating conditions such as coal powder particle size, boiler air distribution and pulverizer air-powder uniformity.

[0015] The water-cooled wall dust accumulation observation point is arranged between the baffle and the cylinder.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention uses high-pressure primary cold air during soot blowing, which has a better effect on removing the dust accumulation on the water-cooled wall and will not cause wear to the water-cooled wall without dust accumulation. Compared with the steam soot blower, the use of primary cold air for soot blowing can achieve energy-saving effects. After the soot blowing is completed, the high-pressure primary cold air is turned off and the high-temperature secondary air is turned on to keep the water-cooled wall area in an oxidizing atmosphere to prevent coking and high-temperature corrosion of the water-cooled wall. Using one system to achieve two purposes simplifies the process and saves construction costs.

[0018] 2. The present invention adopts a sensing function. The oxygen measurement point monitors the oxygen content of the water-cooled wall, providing a basis for the secondary air adjustment of the furnace air soot blower of the new sensing method; the flue gas temperature measurement point monitors the furnace combustion temperature to prevent the boiler combustion from deteriorating, and provides timely information for the operation adjustment of the boiler, so that the boiler is more adaptable to changes in coal types; the water-cooled wall ash accumulation observation point can observe the ash accumulation degree of the water-cooled wall in real time, realize accurate soot blowing, and thus greatly improve the safety and stability of the unit operation.

[0019] 3. The end baffle of the present invention adopts a hollow cavity, and cooling air is transported to the inside of the hollow cavity by a cooling air duct. The cooling air is rotated by spiral blades and ejected from a conical outlet swirl to cover the end baffle and protect the end baffle from being burned by high-temperature flue gas. During the flue gas sampling process, the cooling air is temporarily closed to ensure the accuracy of the flue gas sample.

[0020] 4. The present invention adopts a glass window arranged at the observation end of the cylinder to observe the overall condition of the water-cooled wall in time. At the same time, due to the long-term use of the equipment, dust and dirt are easily accumulated on the glass window. Therefore, a purge air duct is arranged on the glass window to clean the glass window in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 is a cross-sectional view of the present invention;

[0024] Figure 3 is a side cross-sectional view of the end baffle of the present invention;

[0025] Figure 4 is a front cross-sectional view of the end baffle of the present invention;

[0026] Figure 5 For the present invention Figure 1 A magnified schematic diagram;

[0027] Figure 6 This is the high-temperature flue gas direction diagram of the present invention.

[0028] In the figure: 1 is a cylinder, 2 is a bracket, 3 is an end baffle, 4 is a hollow cavity, 5 is a rotating blade group, 6 is an air outlet, 7 is an air inlet, 8 is a cooling air duct, 9 is a glass window, 10 is a purge air duct, 11 is a water-cooled wall, 12 is a flue gas temperature measuring point, 13 is a water-cooled wall ash accumulation observation point, 14 is an oxygen measurement point, 15 is a flue gas sampling tube, 16 is a flue gas sealing box, 17 is a primary air duct, and 18 is a secondary air duct. DETAILED DESCRIPTION

[0029] As shown in the figure, the new sensing furnace air soot blower comprises a cylinder 1 and an end baffle 3 installed on the nozzle side of the cylinder 1 through a bracket 2;

[0030] The end baffle 3 is connected to a plurality of sensing points, a hollow cavity 4 is provided inside the end baffle 3, a plurality of rotating blade groups 5 are installed on the hollow cavity 4, an air outlet 6 and an air inlet 7 communicating with the hollow cavity 4 are respectively provided on both sides of the end baffle 3, one end of the air inlet 7 is connected to a cooling air duct 8, and the cooling air duct 8 is provided through the cylinder 1;

[0031] The upper end of the cylinder 1 away from the nozzle side is connected to a primary air duct 17 and a secondary air duct 18; high-pressure primary cold air is used when soot blowing the water-cooled wall, which has a good effect on removing the dust accumulation on the water-cooled wall and will not cause wear to the water-cooled wall without dust accumulation. After soot blowing, the high-pressure primary cold air is turned off and the high-temperature secondary air is turned on to keep the oxidizing atmosphere in the water-cooled wall area, prevent the water-cooled wall from coking and high-temperature corrosion, thereby greatly improving the safety and stability of the unit operation.

[0032] Preferably, a glass window 9 is provided at the observation end of the cylinder 1, and a purge air duct 10 is installed on the glass window 9, and the other end of the purge air duct 10 passes through the cylinder 1 and is connected to the purge box; by providing a glass window at the observation end of the cylinder, the overall condition of the water-cooled wall can be observed in time. At the same time, due to the long-term use of the equipment, dust and dirt are easily accumulated on the glass window. Therefore, a purge air duct is provided on the glass window, so that the glass window can be cleaned in time.

[0033] The end baffle adopts a hollow cavity, and cooling air is transported into the hollow cavity by the cooling air duct. The cooling air is rotated by the spiral blades and ejected from the conical outlet swirl, covering the end baffle to protect the end baffle from being burned by high-temperature flue gas. During the flue gas sampling process, the cooling air is temporarily closed to ensure the accuracy of the flue gas sample.

[0034] Preferably, the nozzle side of the cylinder 1 extends out of the water-cooled wall 11, and the nozzle side is used to output the purge air.

[0035] Preferably, the plurality of sensing measuring points are respectively a flue gas temperature measuring point 12, a water-cooled wall dust deposition observation point 13 and an oxygen content measuring point 14; the oxygen content side point 14 is connected to a flue gas sampling tube 15, the flue gas sampling tube 15 is arranged to penetrate the cooling air duct 8, a switch valve is arranged on the flue gas sampling tube 15, and the flue gas sampling tube 15 and the cooling air duct 8 do not work at the same time.

[0036] Preferably, the oxygen measurement point 14 can monitor the oxygen content near the water-cooled wall 11. If the oxygen content is lower than 0.5%, the air volume is increased to make the oxygen content in the area greater than 1%, so that the area near the water-cooled wall is in an oxidizing atmosphere.

[0037] Preferably, the flue gas temperature measuring point 12 is used to detect the flue gas temperature near the water-cooled wall 11. If the flue gas temperature in this area is greater than 1200°C, it means that the burning carbon particles have not been completely burned when approaching the water-cooled wall 11. Flushing the water-cooled wall 11 may cause coking and high-temperature corrosion, and it is necessary to adjust the operating conditions such as coal powder particle size, boiler air distribution, and pulverizer air-powder uniformity.

[0038] Preferably, the water-cooled wall dust accumulation observation point 13 observes the dust accumulation degree of the water-cooled wall to achieve precise soot blowing.

[0039] Preferably, a flue gas sealing box 16 is disposed around the cylinder 1 , and the flue gas sealing box 16 is disposed in close contact with the water-cooled wall 11 .

[0040] Preferably, a plurality of air outlets 6 are provided, and each air outlet 6 is a truncated cone structure.

[0041] Preferably, the water-cooled wall dust accumulation observation point 13 is arranged between the end baffle 3 and the cylinder 1 .

[0042] The workflow of the present invention is:

[0043] First, install several soot blowers to the corresponding positions of the water-cooled wall 11, and open the secondary air duct 18. At this time, the oxygen measurement point monitors the oxygen content of the water-cooled wall in real time, providing a corresponding basis for the secondary air volume adjustment of the furnace air soot blower of the present invention. Then the secondary air is input into the cylinder 1 and ejected from the nozzle side of the cylinder 1. Since the end baffle 3 is provided, an air film can be formed on the surface of the water-cooled wall 11 to achieve an oxidizing atmosphere on the surface of the water-cooled wall; the degree of soot accumulation on the water-cooled wall is observed in real time through the soot accumulation observation point on the cold wall. When soot blowing is required, the high-temperature secondary air 18 is closed, and the primary air duct 17 is opened to make the high-pressure primary cold air accurately soot blow. After the soot blowing is completed, the primary air is closed. (Repeat the above work flow according to the on-site situation. At the same time, the position of the soot blower in the text is not limited to the attached manual. Figure 6 The position and quantity indicated in the figure).

[0044] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Those familiar with the technology may modify or improve the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A new type of sensing furnace air soot blower, characterized in that: It comprises a cylinder (1) and an end baffle (3) mounted on the nozzle side of the cylinder (1) via a bracket (2); The end baffle (3) is connected to a plurality of sensing points, a hollow cavity (4) is provided inside the end baffle (3), a plurality of rotating blade groups (5) are installed on the hollow cavity (4), an air outlet (6) and an air inlet (7) communicating with the hollow cavity (4) are provided on both sides of the end baffle (3), one end of the air inlet (7) is connected to a cooling air duct (8), and the cooling air duct (8) is provided through the cylinder (1); The upper end of the cylinder (1) away from the nozzle is connected to a primary air duct (17) and a secondary air duct (18).

2. The novel sensing furnace air sootblower according to claim 1 is characterized in that: A glass window (9) is provided at the observation end of the cylinder (1), and a purge air duct (10) is installed on the glass window (9).

3. The novel sensing furnace air sootblower according to claim 2 is characterized in that: The nozzle side of the cylinder (1) extends out of the water-cooled wall (11), and the nozzle side is used to output purge air.

4. The novel sensing furnace air sootblower according to claim 2 is characterized in that: The plurality of sensing measurement points are respectively a flue gas temperature measurement point (12), a water-cooled wall dust accumulation observation point (13), and an oxygen measurement point (14), and the oxygen measurement point (14) is connected to a flue gas sampling tube (15).

5. The novel sensing furnace air sootblower according to any of claims 1 to 4, characterized in that: A flue gas sealing box (16) is arranged in the circumferential direction of the cylinder (1), and the flue gas sealing box (16) is arranged in close contact with the water-cooled wall (11).

6. The novel sensing furnace air sootblower according to claim 1, characterized in that: A plurality of air outlets (6) are provided, and the air outlets (6) are of a truncated cone structure.

7. The novel sensing furnace air sootblower according to claim 4, characterized in that: When the oxygen content of the water-cooled wall (11) is detected by the oxygen content measuring point (14) to be lower than 0.5%, the air volume needs to be increased to make the oxygen content greater than 1% to ensure that the water-cooled wall area is in an oxidizing atmosphere.

8. The novel sensing furnace air sootblower according to claim 4, characterized in that: The flue gas temperature measuring point (12) detects the flue gas temperature of the water-cooled wall (11). If the flue gas temperature is greater than 1200°C, it indicates that the carbon particles are not completely burned, and it is necessary to adjust the coal powder particle size, boiler air distribution and coal mill air powder uniformity.

9. The novel sensing furnace air sootblower according to claim 7 or 8, characterized in that: The water-cooled wall dust accumulation observation point (13) is arranged between the end baffle (3) and the cylinder (1).

Images