Boiler combustion efficiency on-line monitoring device

Abstract

The utility model provides an on-line monitoring device for boiler combustion efficiency, which comprises a casing (1), a flue gas passage (2) arranged in the casing (1), an inlet section carbon dioxide detector (4) arranged at the inlet section of the flue gas passage (2), a heating device (5) arranged on the flue gas passage (2), the heating device (5) being capable of heating the residual carbon in the flue gas in the flue gas passage (2) to a temperature above the carbon ignition point, and an outlet section carbon dioxide detector (7) arranged behind the heating device (5) on the flue gas passage (2). The on-line monitoring device for boiler combustion efficiency can accurately measure the amount of residual carbon in the flue gas of a boiler in real time, has good measurement stability, requires little maintenance, and has high precision, thereby being capable of controlling and optimizing the combustion state of the boiler and reducing the coal consumption for power generation.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of boiler combustion efficiency online monitoring device. BACKGROUND

[0002] Boiler combustion efficiency can be examined by detecting carbon content of boiler fly ash, by real-time detection of carbon content of fly ash, it will be advantageous to guide operation to adjust the ratio of wind and coal, improve the level of boiler combustion control;Reasonably control the index of carbon content of fly ash, it is advantageous to reduce the cost of power generation, improve the economy of unit operation. With the continuous development of China's power generation unit to large capacity, high parameter, to control and optimize the carbon content of boiler fly ash on-line detection, to control and optimize the boiler combustion, reduce the coal consumption of power generation, improve the ability of "bidding on-line" and the comprehensive utilization of fly ash has become increasingly important and urgent.

[0003] The traditional measurement method of carbon content of fly ash is chemical ignition weight loss method, it is a kind of offline laboratory analysis method, this method has its high precision characteristics, but due to the influence of ash sample collection, analysis time lag and other factors, the measurement result cannot accurately reflect the current boiler combustion condition in time, the control of boiler combustion and the guidance of combustion adjustment lack real-time. But the online boiler carbon content of fly ash monitor basically adopts microwave measurement technology at present, but the measurement of carbon content of fly ash by microwave measurement technology is greatly influenced by the change of coal type, the measurement stability and precision are not ideal, it is difficult to meet the requirements of users on measurement precision and stability, and most of the maintenance amount is large. SUMMARY

[0004] The purpose of the present application is to provide a kind of boiler flue gas residual carbon quantity that can be measured in real time accurately, the stability of measurement is good, maintenance amount is small, precision is high, and then can control and optimize the state of boiler combustion, reduce the coal consumption of power generation of boiler combustion efficiency online monitoring device.

[0005] The boiler combustion efficiency online monitoring device of the present application comprises a casing, a flue gas passage is arranged in the casing, an inlet section carbon dioxide detector is arranged at the inlet section of the flue gas passage, a heating device is arranged on the flue gas passage, the heating device can heat the residual carbon in the flue gas to a temperature above the carbon ignition point, and an outlet section carbon dioxide detector is arranged at the rear of the heating device on the flue gas passage.

[0006] Preferably, a flue gas flow tester is arranged on the flue gas passage.

[0007] Preferably, the heating device is a microwave heating device, an infrared heating device, an electric heating device, a high-temperature plasma heating device or a hot air medium heating device.

[0008] Preferably, the flue gas passage is communicated with the outside atmosphere through an air conveying pipe in series with an air suction fan, and the air conveying pipe is used to supplement oxygen to the flue gas passage to assist combustion of carbon elements in the flue gas.

[0009] Preferably, the flue gas passage is communicated with the outside atmosphere through an air conveying pipe in series with an air suction fan, and the air conveying pipe is used to supplement oxygen to the flue gas passage to assist combustion of carbon elements in the flue gas.

[0010] Preferably, the outer wall of the casing is coated with a layer of thermal insulation material.

[0011] Preferably, the inlet end of the flue gas passage is provided with a cyclone separator, the air inlet pipe of the cyclone separator is communicated with the flue gas conveying pipe of the boiler at the front end of the dust collector, the dust discharge pipe of the cyclone separator is communicated with the inlet of the flue gas passage, and the dust discharge pipe of the cyclone separator can continuously discharge the dust collected by the cyclone separator into the inlet section of the flue gas passage by gravity.

[0012] Preferably, the exhaust pipe of the cyclone separator is communicated with the flue gas conveying pipe of the boiler or the smoke inlet of the air suction fan through an exhaust pipe line in series with an exhaust gate, and an exhaust flow tester is arranged on the exhaust pipe line.

[0013] Preferably, the exhaust pipe of the cyclone separator is communicated with the inlet section of the flue gas passage through an adjusting pipe line in series with an adjusting gate.

[0014] When the boiler combustion efficiency online monitoring device of the present application is in use, the inlet section carbon dioxide detector can measure the concentration of carbon dioxide in the flue gas entering the flue gas passage, the outlet section carbon dioxide detector can measure the concentration of carbon dioxide in the flue gas about to leave the flue gas passage, and the concentration of newly added carbon dioxide is obtained by subtracting the concentration of carbon dioxide measured by the inlet section carbon dioxide detector from the concentration of carbon dioxide measured by the outlet section carbon dioxide detector. These newly added carbon dioxide is produced by the residual carbon carried in the flue gas entering the flue gas passage being heated by the heating device to above the carbon ignition point, and then reacting with oxygen. Therefore, the amount of residual carbon carried in the flue gas entering the flue gas passage can be determined by the concentration of newly added carbon dioxide, that is, the residual carbon carried in the flue gas entering the flue gas passage is directly proportional to the concentration of newly added carbon dioxide. The greater the measured concentration of newly added carbon dioxide, the more residual carbon carried in the flue gas; conversely, the smaller the measured concentration of newly added carbon dioxide, the less residual carbon carried in the flue gas. Thus, the carbon content in the boiler fly ash can be detected online to control and optimize the boiler combustion and reduce the coal consumption for power generation. Therefore, the boiler combustion efficiency online monitoring device of the present application has the characteristics of accurately measuring the amount of residual carbon in the boiler flue gas in real time, good stability of measurement, small maintenance amount, high precision, and further controlling and optimizing the boiler combustion state and reducing the coal consumption for power generation.

[0015] Further details and features of the boiler combustion efficiency online monitoring device of the present invention will become clear from the embodiments described in detail below in conjunction with the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of one embodiment of the online boiler combustion efficiency monitoring device of the present invention;

[0017] Figure 2 This is a schematic diagram of another embodiment of the boiler combustion efficiency online monitoring device of the present invention. Detailed Implementation

[0018] like Figure 1 As shown, the boiler combustion efficiency online monitoring device of the present invention includes a casing 1, a flue gas passage 2 is provided inside the casing 1, an inlet section carbon dioxide detector 4 is provided at the inlet section of the flue gas passage 2, a heating device 5 is provided on the flue gas passage 2, the heating device 5 can heat the residual carbon in the flue gas in the flue gas passage 2 to a temperature above the carbon ignition point, and an outlet section carbon dioxide detector 7 is provided on the flue gas passage 2 behind the heating device 5.

[0019] As a further improvement of the present invention, a flue gas flow meter 3 is provided on the flue gas passage 2.

[0020] As a further improvement of the present invention, the heating device 5 is a microwave heating device, an infrared heating device, an electric heating device, a high-temperature plasma heating device, or a hot air medium heating device.

[0021] As a further improvement of the present invention, the flue gas passage 2 is connected to the outside atmosphere through an air supply pipe 9 connected in series with an air intake fan 8. The air supply pipe 9 is used to supplement oxygen into the flue gas passage 2 to assist the combustion of carbon elements in the flue gas.

[0022] As a further improvement of the present invention, the outlet or inlet end of the above-mentioned flue gas passage 2 is provided with an adjustable speed smoke extraction fan 10, which is used to draw flue gas into the flue gas passage 2.

[0023] As a further improvement of the present invention, the outer wall of the aforementioned housing 1 is covered with a layer of thermal insulation material.

[0024] The boiler combustion efficiency online monitoring device of the above embodiment can measure the concentration of carbon dioxide in the flue gas entering the flue gas passage 2 by the inlet section carbon dioxide detector 4, and measure the concentration of carbon dioxide in the flue gas about to leave the flue gas passage 2 by the outlet section carbon dioxide detector 7. The concentration of carbon dioxide measured by the outlet section carbon dioxide detector 7 minus the concentration of carbon dioxide measured by the inlet section carbon dioxide detector 4 is the concentration of newly added carbon dioxide. The newly added carbon dioxide is produced by the residual carbon carried in the flue gas entering the flue gas passage 2 being heated by the heating device 5 to above the carbon ignition point, and then oxidizing and burning with oxygen. Therefore, the amount of residual carbon carried in the flue gas entering the flue gas passage 2 can be determined by the concentration of newly added carbon dioxide, that is, the residual carbon carried in the flue gas entering the flue gas passage 2 is proportional to the concentration of newly added carbon dioxide. The greater the measured concentration of newly added carbon dioxide, the more residual carbon carried in the flue gas. Conversely, the smaller the measured concentration of newly added carbon dioxide, the less residual carbon carried in the flue gas. Therefore, the carbon content in the boiler fly ash can be detected online to control and optimize the boiler combustion and reduce the coal consumption for power generation. Therefore, the boiler combustion efficiency online monitoring device has the characteristics of real-time and accurate measurement of the amount of residual carbon in the boiler flue gas, good stability of measurement, small maintenance amount, high precision, and further control and optimization of the boiler combustion state and reduction of the coal consumption for power generation.

[0025] As shown in Figure 2 The boiler combustion efficiency online monitoring device of the present application can also include a housing 1, the housing 1 is provided with a flue gas passage 2, the inlet section of the flue gas passage 2 is provided with an inlet section carbon dioxide detector 4, the flue gas passage 2 is provided with a heating device 5, the heating device 5 can heat the residual carbon in the flue gas in the flue gas passage 2 to a temperature above the carbon ignition point, the outlet section of the flue gas passage 2 located behind the heating device 5 is provided with an outlet section carbon dioxide detector 7, the inlet end of the flue gas passage 2 is provided with a cyclone separator 11, the air inlet pipe of the cyclone separator 11 is communicated with the exhaust pipe of the boiler located in front of the dust collector through a dust-containing flue gas conveying pipe, the dust discharge pipe of the cyclone separator 11 is communicated with the inlet of the flue gas passage 2, and the dust discharge pipe of the cyclone separator 11 can continuously discharge the dust collected by the cyclone separator 11 into the inlet section of the flue gas passage 2 by direct falling under the action of gravity without obstruction. The dust discharge pipe of the cyclone separator 11 cannot be installed with a device that can cut off the dust discharge pipe and thus block the direct falling of the dust under the action of gravity without obstruction.

[0026] As a further improvement of the present application, the above-mentioned flue gas passage 2 is provided with a flue gas flow tester 3.

[0027] As a further improvement of the present application, the above-mentioned heating device 5 is a microwave heating device, an infrared heating device, an electric heating device, a high-temperature plasma heating device, or a hot air medium heating device.

[0028] As a further improvement of the present application, the flue gas passage 2 is communicated with the outside atmosphere through an air delivery pipe 9 in series with a suction fan 8, which is used to supplement oxygen into the flue gas passage 2 to assist the combustion of carbon in the flue gas.

[0029] As a further improvement of the present application, the flue gas passage 2 is communicated with the outside atmosphere through an air delivery pipe 9 in series with a suction fan 8, which is used to supplement oxygen into the flue gas passage 2 to assist the combustion of carbon in the flue gas.

[0030] As a further improvement of the present application, the flue gas passage 2 is communicated with the outside atmosphere through an air delivery pipe 9 in series with a suction fan 8, which is used to supplement oxygen into the flue gas passage 2 to assist the combustion of carbon in the flue gas.

[0031] As a further improvement of the present application, the flue gas passage 2 is communicated with the outside atmosphere through an air delivery pipe 9 in series with a suction fan 8, which is used to supplement oxygen into the flue gas passage 2 to assist the combustion of carbon in the flue gas.

[0032] As a further improvement of the present application, the flue gas passage 2 is communicated with the outside atmosphere through an air delivery pipe 9 in series with a suction fan 8, which is used to supplement oxygen into the flue gas passage 2 to assist the combustion of carbon in the flue gas.

[0033] The boiler combustion efficiency on-line monitoring device of the embodiment is different from the above embodiment in that a cyclone separator 11 is arranged at the inlet end of the flue gas passage 2, the cyclone separator 11 can collect and concentrate the particulate matters in the flue gas, and then deliver the collected and concentrated particulate matters to the inlet end of the flue gas passage 2; the inlet section carbon dioxide detector 4 of the flue gas passage 2 can measure the carbon dioxide concentration of the flue gas entering the flue gas passage 2, the outlet section carbon dioxide detector 7 can measure the carbon dioxide concentration of the flue gas about to leave the flue gas passage 2, and the carbon dioxide concentration measured by the outlet section carbon dioxide detector 7 minus the carbon dioxide concentration measured by the inlet section carbon dioxide detector 4 is the newly added carbon dioxide concentration, which is produced by the residual carbon in the flue gas entering the flue gas passage 2 being heated by the heating device 5 to above the carbon ignition point, and then being oxidized and combusted with oxygen, so that the amount of the residual carbon in the flue gas entering the flue gas passage 2 can be determined according to the newly added carbon dioxide concentration, that is, the amount of the residual carbon in the flue gas entering the flue gas passage 2 is proportional to the newly added carbon dioxide concentration, and the greater the newly added carbon dioxide concentration measured, the more the residual carbon in the flue gas; on the contrary, the smaller the newly added carbon dioxide concentration measured, the less the residual carbon in the flue gas. Since the cyclone separator 11 is added, the amount of the residual carbon in the flue gas carrying very little residual carbon can be more accurately measured, so that the carbon content in the boiler fly ash can be on-line detected to control and optimize the boiler combustion and reduce the power generation coal consumption. Therefore, the boiler combustion efficiency on-line monitoring device has the characteristics of accurately measuring the amount of residual carbon in the boiler flue gas in real time, good stability, small maintenance amount, high precision, and further controlling and optimizing the boiler combustion state and reducing the power generation coal consumption.

Claims

1. Boiler combustion efficiency on-line monitoring device, including the casing (1), the casing (1) is equipped with flue gas passage (2), the inlet section of flue gas passage (2) is equipped with inlet section carbon dioxide detector (4), flue gas passage (2) is equipped with heating device (5), heating device (5) can heat the flue gas carbon in flue gas passage (2) to the temperature above the carbon ignition point, the rear of flue gas passage (2) in heating device (5) is equipped with outlet section carbon dioxide detector (7); In use, the inlet section carbon dioxide detector (4) can measure the concentration of carbon dioxide in the flue gas entering the flue gas passage (2), the outlet section carbon dioxide detector (7) can measure the concentration of carbon dioxide in the flue gas about to leave the flue gas passage (2), the concentration of carbon dioxide measured by the outlet section carbon dioxide detector (7) minus the concentration of carbon dioxide measured by the inlet section carbon dioxide detector (4) is the newly added concentration of carbon dioxide.

2. The on-line boiler combustion efficiency monitoring device of claim 1, wherein The flue gas passage (2) is equipped with flue gas flow tester (3).

3. The on-line boiler combustion efficiency monitoring device of claim 2, wherein The heating device (5) is a microwave heating device or an infrared heating device or an electric heating device or a high-temperature plasma heating device or a hot air medium heating device.

4. The on-line boiler combustion efficiency monitoring apparatus of claim 3, wherein The flue gas passage (2) is communicated with the outside atmosphere through the air conveying pipe (9) in series with the air suction fan (8), and the air conveying pipe (9) is used for supplementing oxygen to assist combustion of carbon elements in the flue gas in the flue gas passage (2).

5. The on-line boiler combustion efficiency monitoring device of claim 4, wherein The outlet end or the inlet end of the flue gas passage (2) is equipped with a speed-adjustable smoke suction fan (10), and the smoke suction fan (10) is used for sucking the flue gas into the flue gas passage (2).

6. The on-line boiler combustion efficiency monitoring apparatus of claim 5, wherein The outer wall of the casing (1) is coated with a layer of thermal insulation material.

7. An on-line boiler combustion efficiency monitoring device according to any one of claims 1 to 6, characterised in that The inlet end of the flue gas passage (2) is equipped with a cyclone separator (11), the inlet pipe of the cyclone separator (11) is communicated with the flue gas duct of the boiler before the dust collector through the dust-containing flue gas conveying pipe, the dust discharge pipe of the cyclone separator (11) is communicated with the inlet of the flue gas passage (2), and the dust discharge pipe of the cyclone separator (11) can continuously discharge the dust collected by the cyclone separator (11) into the inlet section of the flue gas passage (2) by gravity.

8. The on-line boiler combustion efficiency monitoring apparatus of claim 7, wherein The exhaust pipe (12) of the cyclone separator (11) is communicated with the smoke inlet of the smoke suction fan (10) or the flue gas duct of the boiler through the exhaust pipe line (14) in series with the exhaust cutoff door (13), and the exhaust flow tester (15) is arranged on the exhaust pipe line (14).

9. The on-line boiler combustion efficiency monitoring apparatus of claim 8, wherein The exhaust pipe of the cyclone separator (11) is communicated with the inlet section of the flue gas passage (2) through the adjusting pipe line (17) in series with the adjusting cutoff door (16).

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