On-line detection device for high-temperature nitrogen oxide concentration of boiler

Abstract

The invention discloses a boiler high-temperature nitrogen oxide concentration on-line detection device, which comprises a sampling pipe, a cooler, a flue gas treatment unit and a nitrogen oxide detection unit, the sampling pipe is used for sampling high-temperature flue gas in a tail flue, the cooler cools the high-temperature flue gas discharged by the sampling pipe, and the nitrogen oxide detection unit is used for detecting nitrogen oxide in the tail flue. The flue gas treatment unit is used for treating the cooled flue gas discharged from the thermal medium outlet, and the nitrogen oxide detection unit is used for detecting the nitrogen oxide content in the flue gas. The device can adapt to the severe environment of high temperature, high water vapor and high dust of the tail flue of the boiler, and long-term stable operation in an industrial field is ensured. Through the cooling unit and the flue gas treatment unit, dust and water vapor in flue gas are effectively removed, the influence of the impurities on nitric oxide detection is avoided, and the accuracy and reliability of detection are improved. The system can detect the concentration of nitrogen oxide discharged by the boiler in real time, timely grasp the discharge condition, and provide data support for environmental protection monitoring and management.

Description

Technical Field

[0001] The invention relates to a nitrogen oxide detection device, in particular to an online detection device for high-temperature nitrogen oxide concentration in a boiler. Background Art

[0002] With the increasing awareness of environmental protection, higher requirements are placed on the monitoring of nitrogen oxide (NOx) concentrations emitted by industries. During the operation of high-temperature combustion equipment such as boilers, a certain amount of nitrogen oxides will be produced. These gases are one of the important sources of air pollution. In order to ensure that the emissions meet environmental standards, these gases need to be detected online in real time. However, since the gases emitted from boiler flues usually have characteristics such as high temperature, high water vapor, and high dust, existing nitrogen oxide monitoring equipment often cannot be directly used in these harsh environments. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present invention provides an online detection device for high-temperature nitrogen oxide concentration in a boiler.

[0005] The online detection device for high-temperature nitrogen oxide concentration of a boiler according to an embodiment of the present invention comprises a sampling tube, a cooler, a flue gas treatment unit and a nitrogen oxide detection unit, wherein the sampling tube is used to be arranged on the tail flue of the boiler and is connected to the tail flue to sample the high-temperature flue gas in the tail flue; the cooler has a hot medium inlet, a hot medium outlet, a cold medium inlet and a cold medium outlet, and the hot medium inlet is connected to the sampling tube to cool the high-temperature flue gas discharged from the sampling tube; the flue gas treatment unit is connected to the hot medium outlet, and the flue gas treatment unit is used to treat the cooled flue gas discharged from the hot medium outlet to remove dust and water vapor in the flue gas; the nitrogen oxide detection unit is connected to the flue gas treatment unit and is used to detect the nitrogen oxide content in the flue gas.

[0006] In some embodiments, the sampling tube includes a main tube and multiple branch tubes, and the multiple branch tubes are arranged on the tail flue at intervals along the height direction of the tail flue. The branch tubes are connected to the inlet of the main tube, and the outlet of the main tube is connected to the heat medium inlet.

[0007] In some embodiments, a first control valve is disposed on the main pipe, and the first control valve is used to control the on-off of the main pipe.

[0008] In some embodiments, the cold medium of the cooler is air.

[0009] In some embodiments, the flue gas treatment unit includes a dust collector, which is connected to the heat medium outlet and the flue gas treatment unit respectively, and the dust collector is used to remove dust in the flue gas.

[0010] In some embodiments, a dust detection sensor is provided at the outlet of the dust collector, and the dust detection sensor is used to detect the concentration of dust particles in the flue gas.

[0011] In some embodiments, the flue gas treatment unit includes a dryer, which is connected to the dust collector and the nitrogen oxide detection unit respectively, and the dryer is used to remove water vapor in the flue gas.

[0012] In some embodiments, a humidity detection sensor is provided at the outlet of the dryer, and the humidity detection sensor is used to detect the humidity in the flue gas.

[0013] In some embodiments, the boiler high-temperature nitrogen oxide concentration online detection device of the embodiment of the present invention further includes an adsorber, which is connected to the dryer to adsorb nitrogen oxides in the flue gas.

[0014] In some embodiments, the boiler high-temperature nitrogen oxide concentration online detection device of the embodiment of the present invention further includes a chimney, and the chimney is connected to the adsorber to discharge the adsorbed clean flue gas through the chimney.

[0015] The boiler high-temperature nitrogen oxide concentration online detection device of the present invention can adapt to the harsh environment of high temperature, high water vapor and high dust in the tail flue of the boiler, and ensure long-term stable operation in the industrial site. Through the cooling and flue gas treatment unit, the dust and water vapor in the flue gas are effectively removed, avoiding the influence of these impurities on the nitrogen oxide detection, and improving the accuracy and reliability of the detection. It can detect the nitrogen oxide concentration emitted by the boiler in real time, grasp the emission status in time, and provide data support for environmental monitoring and management. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of an online detection device for high-temperature nitrogen oxide concentration in a boiler according to an embodiment of the present invention

[0017] Reference numerals:

[0018] 100. On-line detection device for high-temperature nitrogen oxide concentration of boiler; 1. boiler; 2. tail flue; 3. sampling tube; 301. main pipe; 302. multiple branch pipes; 4. cooler; 401. hot medium inlet; 402. hot medium outlet; 403. cold medium inlet; 404. cold medium outlet; 5. flue gas treatment unit; 501. dust collector; 502. dryer; 6. nitrogen oxide detection unit; 7. first control valve; 8. dust detection sensor; 9. humidity detection sensor; 10. adsorber; 11. chimney. DETAILED DESCRIPTION

[0019] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0020] like Figure 1 As shown, the boiler high-temperature nitrogen oxide concentration online detection device 100 of the embodiment of the present invention includes a sampling tube 3, a cooler 4, a flue gas treatment unit 5 and a nitrogen oxide detection unit 6. The sampling tube 3 is used to be arranged on the tail flue 2 of the boiler 1 and communicated with the tail flue 2 to sample the high-temperature flue gas in the tail flue 2. The cooler 4 has a hot medium inlet 401, a hot medium outlet 402, a cold medium inlet 403 and a cold medium outlet 404. The hot medium inlet 401 is connected to the sampling tube 3 to cool the high-temperature flue gas discharged from the sampling tube 3. The flue gas treatment unit 5 is connected to the hot medium outlet 402, and the flue gas treatment unit 5 is used to treat the flue gas discharged from the hot medium outlet 402 after cooling to remove dust and water vapor in the flue gas. The nitrogen oxide detection unit 6 is connected to the flue gas treatment unit 5 and is used to detect the nitrogen oxide content in the flue gas.

[0021] When the online detection device 100 for high-temperature nitrogen oxide concentration of a boiler according to an embodiment of the present invention is in use, the sampling tube 3 is arranged on the tail flue 2 of the boiler 1 and is connected to the tail flue 2, so as to obtain a flue gas sample representing the gas composition in the flue from the tail flue 2. The high-temperature flue gas discharged from the sampling tube 3 enters the cooler 4 through the heat medium inlet 401 of the cooler 4. The cooler 4 contains a heat medium circulation system, and the high-temperature flue gas exchanges heat with the heat medium, so that the temperature of the flue gas is reduced. The cooled flue gas is discharged from the heat medium outlet 402 and enters the flue gas treatment unit 5. The main function of the flue gas treatment unit 5 is to remove dust and dehumidify the flue gas, ensuring that the flue gas entering the nitrogen oxide detection unit 6 is clean and dry, and will not interfere with the detection unit. The treated flue gas is sent to the nitrogen oxide detection unit 6, which uses a specific sensor or analytical instrument to accurately detect the nitrogen oxide content in the flue gas.

[0022] The boiler high-temperature nitrogen oxide concentration online detection device 100 of the present invention can adapt to the harsh environment of high temperature, high water vapor and high dust in the tail flue 2 of the boiler 1, and ensure long-term stable operation in the industrial site. Through the cooling and flue gas treatment unit 5, the dust and water vapor in the flue gas are effectively removed, avoiding the influence of these impurities on the nitrogen oxide detection, and improving the accuracy and reliability of the detection. It can detect the nitrogen oxide concentration emitted by the boiler 1 in real time, grasp the emission status in time, and provide data support for environmental monitoring and management.

[0023] In some embodiments, the sampling pipe 3 includes a main pipe 301 and a plurality of branch pipes 302. The plurality of branch pipes 302 are arranged on the tail flue 2 at intervals along the height direction of the tail flue 2, the branch pipes are connected to the inlet of the main pipe 301, and the outlet of the main pipe 301 is connected to the heat medium inlet 401. The main pipe 301 is the main channel for the flue gas flow, and the branch pipes are sampling points distributed at different heights of the tail flue 2. The design of the branch pipes usually takes into account the flow characteristics of the flue gas in the flue to ensure the uniformity and representativeness of the sampling.

[0024] In some embodiments, a first control valve 7 is disposed on the main pipe 301 , and the first control valve 7 is used to control the on-off of the main pipe 301 .

[0025] When the first control valve 7 is in the open state, the flue gas in the tail flue 2 can enter the main pipe 301 through the branch pipe, and flow to the cooler 4 for heat exchange and cooling. When the first control valve 7 is closed, the flow of flue gas in the main pipe 301 is blocked, and the flue gas will not enter the cooler 4. The first control valve 7 can quickly cut off the flow of flue gas when an abnormal situation occurs in the system, protecting the cooler 4 and the detection unit from damage by high-temperature flue gas. When the system needs to be maintained or cleaned, the flow of flue gas can be stopped by closing the first control valve 7, which is convenient for the staff to operate. When the detection unit or cooler 4 fails, closing the first control valve 7 can isolate the faulty part, which is convenient for troubleshooting and repair.

[0026] In some embodiments, the cold medium of the cooler 4 is air.

[0027] The high-temperature flue gas enters through the hot medium inlet 401 of the cooler 4 and exchanges heat with the air inside the cooler 4. After the air absorbs the heat of the flue gas, the temperature rises and then it is discharged through the cold medium outlet 404. The flow of air is usually provided by a fan, which can be natural convection or forced convection. In the case of forced convection, the fan blows cold air through the cooler 4 to accelerate the heat exchange process. Air is a free and unlimited resource. Using air as a cooling medium can save resources such as water and electricity and reduce operating costs. The air cooler 4 does not require a water cooling system, so no sewage is generated, which helps to reduce the impact on the environment.

[0028] In some embodiments, the flue gas treatment unit 5 includes a dust collector 501, which is connected to the heat medium outlet 402 and the flue gas treatment unit 5 respectively, and the dust collector 501 is used to remove dust in the flue gas.

[0029] The dust collector 501 removes dust from the flue gas, which can prevent dust particles from interfering with the detection unit and improve the accuracy of nitrogen oxide concentration detection. The purified flue gas enters the detection unit, which helps to extend the service life of the detection equipment and reduce the frequency of maintenance and replacement. The dust collector 501 can work in conjunction with other components in the flue gas treatment unit 5 (such as a dehumidifier) ​​to jointly optimize the treatment effect of the flue gas.

[0030] In some embodiments, a dust detection sensor 8 is provided at the outlet of the dust collector 501, and the dust detection sensor 8 is used to detect the concentration of dust particles in the flue gas.

[0031] The dust detection sensor 8 is located at the outlet of the dust collector 501, so that the dust particle concentration in the flue gas can be detected immediately after the dust removal process. By real-time monitoring of the dust concentration, the working state of the dust collector 501 can be timely understood to ensure that the discharged flue gas meets the environmental protection standards. The data provided by the dust detection sensor 8 enables the system to realize automatic control, automatically adjust the operating parameters according to the change of dust concentration, and improve the intelligence and efficiency of the system operation.

[0032] In some embodiments, the flue gas treatment unit 5 includes a dryer 502, which is connected to the dust collector 501 and the nitrogen oxide detection unit 6 respectively, and the dryer 502 is used to remove water vapor in the flue gas.

[0033] When the flue gas passes through the dryer 502, the water vapor therein is absorbed by the desiccant or removed by cooling and condensation, thereby reducing the humidity of the flue gas. The dryer 502 is filled with desiccant, such as silica gel, molecular sieve, etc., which have high-efficiency hygroscopic properties. By removing the water vapor in the flue gas, the interference of water vapor on the nitrogen oxide detection unit 6 can be avoided, and the accuracy and reliability of the detection can be improved. Dry flue gas helps to extend the service life of the nitrogen oxide detection unit 6 and reduce equipment corrosion or other damage caused by humidity. The dryer 502 works together with the dust collector 501 and the nitrogen oxide detection unit 6 to form a complete flue gas treatment and detection process to ensure that pollutants in the flue gas are effectively monitored and controlled.

[0034] In some embodiments, a humidity detection sensor 9 is provided at the outlet of the dryer 502, and the humidity detection sensor 9 is used to detect the humidity in the flue gas.

[0035] The humidity detection sensor 9 is located at the outlet of the dryer 502 and is used to monitor the humidity of the smoke after drying. By real-time monitoring of the smoke humidity, the working state of the dryer 502 can be adjusted in time to ensure that the smoke drying effect meets the detection requirements. The integration of the humidity detection sensor 9 and the control system can realize automatic control, automatically optimize the drying process according to the humidity data, and improve the intelligence and operation efficiency of the system.

[0036] In some embodiments, the boiler high-temperature nitrogen oxide concentration online detection device 100 of the embodiment of the present invention further includes an adsorber 10, and the adsorber 10 is connected to the dryer 502 to adsorb nitrogen oxides in the flue gas.

[0037] The function of the adsorber 10 is to further purify the flue gas by adsorbing nitrogen oxides in the flue gas through a specific adsorbent (such as activated carbon, molecular sieve, etc.), thereby reducing the emission concentration of nitrogen oxides. The adsorber 10 is connected to the dryer 502, so that the low-humidity flue gas that has been dried can directly enter the adsorber 10 to improve the adsorption efficiency. The adsorber 10 can reduce the emission concentration of nitrogen oxides, help meet strict environmental emission standards, and reduce pollution to the atmospheric environment.

[0038] In some embodiments, the boiler high-temperature nitrogen oxide concentration online detection device 100 of the embodiment of the present invention further includes a chimney 11 , which is connected to the adsorber 10 to discharge the adsorbed clean flue gas through the chimney 11 .

[0039] The chimney 11 is connected to the adsorber 10. After being purified by the adsorber 10, the flue gas is discharged into the atmosphere through the chimney 11 to ensure that the flue gas can be discharged safely and effectively.

[0040] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0045] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An online detection device for high-temperature nitrogen oxide concentration in a boiler, characterized in that: include: A sampling tube (3), the sampling tube (3) being arranged on a tail flue (2) of a boiler (1) and being in communication with the tail flue (2) so as to sample high-temperature flue gas in the tail flue (2); A cooler (4), the cooler (4) having a hot medium inlet (401), a hot medium outlet (402), a cold medium inlet (403) and a cold medium outlet (404), the hot medium inlet (401) being in communication with the sampling tube (3) to cool the high-temperature flue gas discharged from the sampling tube (3); a flue gas treatment unit (5), the flue gas treatment unit (5) being in communication with the heat medium outlet (402), the flue gas treatment unit (5) being used to treat the flue gas discharged from the heat medium outlet (402) after cooling, so as to remove dust and water vapor in the flue gas; A nitrogen oxide detection unit (6), the nitrogen oxide detection unit (6) is connected to the flue gas treatment unit (5) and is used to detect the nitrogen oxide content in the flue gas.

2. The online detection device for high-temperature nitrogen oxide concentration of a boiler according to claim 1 is characterized in that: The sampling tube (3) comprises a main tube (301) and a plurality of branch tubes (302), wherein the plurality of branch tubes are arranged on the tail flue (2) at intervals along the height direction of the tail flue (2), the branch tubes are connected to the inlet of the main tube (301), and the outlet of the main tube (301) is connected to the heat medium inlet (401).

3. The online detection device for high-temperature nitrogen oxide concentration of a boiler according to claim 2 is characterized in that: The main pipe (301) is provided with a first control valve (7), and the first control valve (7) is used to control the on and off of the main pipe (301).

4. The on-line detection device for high-temperature nitrogen oxide concentration of a boiler according to claim 1, characterized in that: The cold medium of the cooler (4) is air.

5. The on-line detection device for high-temperature nitrogen oxide concentration of a boiler according to claim 1, characterized in that: The flue gas treatment unit (5) comprises a dust collector (501), the dust collector (501) being connected to the heat medium outlet (402) and the flue gas treatment unit (5) respectively, and the dust collector (501) being used to remove dust in the flue gas.

6. The on-line detection device for high-temperature nitrogen oxide concentration of a boiler according to claim 5, characterized in that: A dust detection sensor (8) is provided at the outlet of the dust collector (501), and the dust detection sensor (8) is used to detect the concentration of dust particles in the flue gas.

7. The on-line detection device for high-temperature nitrogen oxide concentration of a boiler according to claim 6, characterized in that: The flue gas treatment unit (5) comprises a dryer (502), the dryer (502) being connected to the dust collector (501) and the nitrogen oxide detection unit (6) respectively, and the dryer (502) being used to remove water vapor in the flue gas.

8. The on-line detection device for high-temperature nitrogen oxide concentration of a boiler according to claim 7, characterized in that: A humidity detection sensor (9) is provided at the outlet of the dryer (502), and the humidity detection sensor (9) is used to detect the humidity in the flue gas.

9. The boiler high-temperature nitrogen oxide concentration online detection device according to claim 8, characterized in that: It also includes an adsorber (10), which is connected to the dryer (502) to adsorb nitrogen oxides in the flue gas.

10. The on-line detection device for high-temperature nitrogen oxide concentration of a boiler according to claim 9, characterized in that: It also comprises a chimney (11), wherein the chimney (11) is connected to the adsorber (10) so as to discharge the clean flue gas after adsorption through the chimney (11).

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