Laser oxygen analyzer

Abstract

The utility model relates to a laser oxygen analyzer, which comprises a transmitting end, a receiving end and a control end, the measuring part comprises an air inlet section, an absorption section and an air outlet section which are sequentially connected, the diameters of the air inlet section, the absorption section and the air outlet section are sequentially increased, and the air inlet section of the measuring part is connected with the transmitting end; the heating part is connected with the measuring part and is used for heating the measuring part; and the receiving end is connected with the air outlet section of the measuring part. Compared with the prior art, the sulfur-containing gas to be detected can be detected, and when the temperature is reduced, the measuring part is heated through the heating part, so that the situation that the gas sulfur is solidified and condensed on the inner wall of the measuring part when the temperature is low, and then the measuring result is influenced is avoided; the sulfur-containing gas to be detected cannot be solidified, so that the accuracy of a detection result is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to laser analysis appearance technical field, especially a kind of laser oxygen analyzer. BACKGROUND

[0002] The working principle of the existing laser oxygen analyzer is that different absorption lines are generated on a specific wavelength by gas. Laser scans one or several absorption lines of the gas to be measured. To avoid interference from other (background) gases, extra care is needed when selecting absorption lines. The laser intensity is a function of the wavelength change due to the influence of gas molecules between the emission end and the receiving end. The receiving end continuously monitors the laser intensity of the selected wavelength. The absorption line amplitude and line width can be obtained from the measured line shape and used for concentration calculation.

[0003] The related technology discloses an online carbon monoxide analyzer, which comprises an emission unit, a receiving unit, a purging unit and a control unit. The emission unit comprises an infrared laser light source and a chopper, the receiving unit comprises a filter gas cell, a filter, a convex lens and a detector, and the emission unit and the receiving unit are installed on the two sides of the heating furnace chimney through flanges. The light path of the emission unit and the receiving unit is on the same straight line, and a light-transmitting wafer is arranged at the end of the light path of the emission unit, and a light-transmitting wafer is arranged at the starting end of the light path of the receiving unit. The purging unit is provided with a purging pipeline and a positive pressure pipeline, the purging pipeline is connected between the light-transmitting wafer and the flange of the emission unit and the receiving unit respectively, and the positive pressure pipeline is connected with the emission unit and the receiving unit respectively. The control unit is connected with the emission unit and the receiving unit through a connecting cable.

[0004] However, when measuring the oxygen content in tail gas of a sulfur recovery device, a small amount of liquid sulfur is entrained in the gas. When the temperature is reduced to below 121 DEG C, the liquid sulfur will be converted into solid state and attached to the inner wall of the flue, resulting in inaccurate measurement of the oxygen content. Therefore, it is necessary for the operator to go to the site to remove the solid sulfur to calibrate the instrument parameters, which greatly increases the labor cost. At the same time, harmful gas may escape during the calibration process, which may increase the safety risk of personnel operation. UTILITY MODEL CONTENTS

[0005] The utility model provides a kind of laser oxygen analyzer, at least can solve sulfur recovery device determination oxygen content in tail gas, gas will entrain a small amount of liquid sulfur, when temperature reduces to below 121 DEG C, liquid sulfur will be converted into solid state and attached to the inner wall of the flue, resulting in inaccurate measurement of the oxygen content.

[0006] The utility model provides a kind of laser oxygen analyzer, comprising:

[0007] Emission end for emitting laser source;

[0008] The measuring part comprises a gas inlet section, an absorption section and a gas outlet section connected in sequence, the diameters of the gas inlet section, the absorption section and the gas outlet section increase in sequence, the gas inlet section of the measuring part is connected with the emitting end;

[0009] The heating part is connected with the measuring part and is used for heating the measuring part;

[0010] The receiving end is connected with the gas outlet section of the measuring part.

[0011] In one embodiment, the heating part comprises at least two groups of heating bands;

[0012] One group of the heating bands is wound on the measuring part along a first direction, and the other group of the heating bands is wound on the measuring part along a second direction;

[0013] The first direction is opposite to the second direction.

[0014] In one embodiment, the gap between adjacent two heating bands wound on the absorption section is greater than the gap between adjacent two heating bands wound on the gas inlet section and the gas outlet section.

[0015] In one embodiment, the heating part further comprises a temperature sensor and a temperature controller;

[0016] The temperature sensor is arranged on the absorption section, and the temperature controller is electrically connected with the temperature sensor and the heating bands.

[0017] In one embodiment, the outer wall of the gas inlet section, the absorption section and the gas outlet section of the measuring part is provided with at least two groups of heating grooves, and the heating part is connected with the measuring part through the heating grooves.

[0018] In one embodiment, the diameter of the gas inlet section increases along the direction from the emitting end to the receiving end, the diameter of the gas outlet section increases along the direction from the emitting end to the receiving end, and the diameter of the absorption section is constant.

[0019] In one embodiment, first and second flanges are further included;

[0020] The first flange and the second flange are provided with bolt holes;

[0021] The emitting end is connected with the gas inlet section through the bolt hole of the first flange, and the receiving end is connected with the gas outlet section through the bolt hole of the second flange.

[0022] In one embodiment, first and second sealing members are further included;

[0023] The first sealing member is arranged between the emitting end and the gas inlet section, and the second sealing member is arranged between the receiving end and the gas outlet section.

[0024] In one embodiment, a laser controller is further included, a first end of the laser controller is connected with the emitting end through a cable, and a second end of the laser controller is connected with the receiving end through a cable.

[0025] In one embodiment, an air inlet is arranged on the air inlet section, and the air inlet is used to be connected with a gas source to be detected.

[0026] Compared with the prior art, the laser oxygen analyzer provided by the utility model has the advantages that the measuring part is sequentially connected with the air inlet section, the absorption section and the measuring section, the diameters of the air inlet section, the absorption section and the measuring section are gradually increased, the absorption range of the visible light by the gas to be detected is increased when the gas to be detected enters the absorption section from the air inlet section, the detection precision is improved, the gas to be detected containing sulfur can be detected, the measuring part is heated by the heating part when the temperature is reduced, the gas sulfur is prevented from being solidified and condensed on the inner wall of the measuring part when the temperature is low, and the measuring result is further affected, in other words, the measuring part is heated by the heating part, the gas to be detected containing sulfur will not be solidified, and the accuracy of the detection result is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] The utility model will be described in more detail below based on the embodiments and with reference to the drawings.

[0028] Figure 1 is the structural schematic diagram of the laser oxygen analyzer in the embodiment of the utility model.

[0029] Reference signs:

[0030] 1-emitting end, 2-receiving end, 3-measuring part, 4-heating part, 31-air inlet section, 32-absorption section, 33-air outlet section, 5-first flange, 6-second flange, 7-air inlet pipe, 8-laser controller. DETAILED DESCRIPTION

[0031] The utility model will be described in more detail below based on the embodiments and with reference to the drawings.

[0032] Reference signs: Figure 1 The embodiment of the utility model provides a kind of laser oxygen analyzer, comprising: emitting end 1, measuring part 3, heating part 4 and receiving end 2.Thereinto, emitting end 1 is used to emit laser source;Measuring part 3 includes sequentially connected air inlet section 31, absorption section 32 and air outlet section 33, the diameter of air inlet section 31, absorption section 32 and air outlet section 33 gradually increases, and the air inlet section 31 of measuring part 3 is connected with emitting end 1;Heating part 4 is connected with measuring part 3, for heating measuring part 3;Receiving end 2 is connected with the air outlet section 33 of measuring part 3.

[0033] The laser oxygen analyzer provided by the utility model, based on the measurement part 3 including the air inlet section 31, the absorption section 32 and the measurement section connected in turn, the diameter of the air inlet section 31, the absorption section 32 and the measurement section increases in turn, when the gas to be detected enters the absorption section 32 from the air inlet section 31, the absorption range of the visible light of the gas to be detected is increased due to the increase of the diameter, the precision of detection is improved, the utility model can detect the gas to be detected containing sulfur, when the temperature is reduced, the measurement part 3 is heated through the heating part 4, so that the gas sulfur is not solidified and condensed in the inner wall of the measurement part 3 when the temperature is low, and the measurement result is further affected, in other words, the measurement part 3 is heated through the heating part 4 in the utility model embodiment, the gas to be detected containing sulfur will not be solidified, and the accuracy of the detection result is further improved.

[0034] The working principle of the laser oxygen analyzer is mainly to measure the oxygen concentration by using the principle that laser energy is absorbed by gas molecules to form an absorption spectrum. Specifically, when the laser controller emits a laser beam of a specific wavelength through the gas to be detected, the oxygen will absorb the laser energy, causing the laser intensity to attenuate. This attenuation is proportional to the oxygen content in the measured gas, so by measuring the attenuation information of the laser intensity, the oxygen concentration of the gas can be analyzed.

[0035] However, when measuring the oxygen content in the tail gas of a sulfur recovery device, a small amount of liquid sulfur will be entrained in the gas to be detected. When the temperature is reduced to below 121 DEG C, the liquid sulfur will be converted into a solid state and attached to the air inlet section 31, the absorption section 32 or the air outlet section 33 of the measurement part 3, resulting in inaccurate measurement of the oxygen content. Therefore, the operating personnel need to go to the scene to remove the solid sulfur to calibrate the instrument parameters, which greatly increases the labor cost. At the same time, harmful gas may escape during the calibration process, which increases the safety risk of personnel operation.

[0036] Therefore, in the utility model embodiment, the heating part 4 is arranged, and when the temperature in the measurement part 3 is lower than the preset temperature, for example, below 121 DEG C, the air inlet section 31, the absorption section 32 or the air outlet section 33 of the measurement part 3 is heated through the heating part 4, so that the liquid sulfur is not solidified and condensed on the inner wall of the air inlet section 31, the absorption section 32 or the air outlet section 33.

[0037] In an optional embodiment, the heating part 4 includes at least two groups of heating bands; one group of heating bands is wound on the measurement part 3 along a first direction, and the other group of heating bands is wound on the measurement part 3 along a second direction; the first direction is opposite to the second direction.

[0038] By arranging two groups of heating bands, if one group of heating bands fails or has a problem, the other group of heating bands can still work normally. In addition, by arranging two groups of heating bands to be wound in different directions, heat loss can be reduced, and the measurement part 3 can be heated from two directions at the same time.

[0039] In an alternative embodiment, the gap between the two adjacent heating bands wound on the absorption section 32 is greater than the gap between the two adjacent heating bands wound on the gas inlet section 31 and the gas outlet section 33.

[0040] It can be understood that the temperature of the to-be-detected gas entering the gas inlet section 31 is also relatively high, and therefore the gap between the two adjacent heating bands can be set to be relatively large, that is, the winding gap of the heating bands on the gas inlet section 31 is relatively large, which reduces the measurement cost when heating the gas inlet section 31.

[0041] However, the to-be-detected gas may be cooled due to the flow of the gas after entering the absorption section 32, and therefore the gap between the two adjacent heating bands wound on the absorption section 32 can be set to be relatively small, that is, the number of turns of the heating bands wound on the absorption section 32 is relatively large, which can quickly heat the absorption section 32 when monitoring the temperature drop of the absorption section 32, thereby improving the detection efficiency and improving the detection accuracy.

[0042] In an alternative embodiment, the heating part 4 further comprises a temperature sensor and a temperature controller, the temperature sensor is arranged on the absorption section 32, and the temperature controller is electrically connected with the temperature sensor and the heating bands.

[0043] The temperature of the measurement part 3 can be obtained in real time through the temperature sensor, and it can also be understood that when the temperature of the absorption section 32 is less than a preset temperature, the heating part 4 can be started through the temperature controller to heat.

[0044] In an alternative embodiment, the outer wall of the gas inlet section 31, the absorption section 32 and the gas outlet section 33 of the measurement part 3 is provided with at least two groups of heating grooves, and the heating part 4 is connected with the measurement part 3 through the heating grooves.

[0045] By arranging the heating grooves, the heating bands can be placed in the heating grooves to prevent the heating bands from loosening or falling off. The heating grooves are arranged along the circumference of the outer wall of the gas inlet section 31, the absorption section 32 and the gas outlet section 33 to facilitate winding of the heating bands.

[0046] In an alternative embodiment, the diameter of the gas inlet section 31 increases along the direction from the emission end 1 to the receiving end 2, the diameter of the gas outlet section 33 increases along the direction from the emission end 1 to the receiving end 2, and the diameter of the absorption section 32 is constant.

[0047] By arranging the diameter of the gas inlet section 31 to increase along the direction from the emission end 1 to the receiving end 2, the absorption of light by the to-be-detected gas can be improved, and the influence of other components on the flow of the gas can be avoided, thereby affecting the absorption of light.

[0048] The diameter of the absorption section 32 is constant, but the diameter of the absorption section 32 is overall larger than the diameter of the gas inlet section 31, so that the absorption of light by the gas to be detected can be ensured while reducing the loss of the temperature of the gas to be detected in the absorption section 32.

[0049] In an alternative embodiment, the first flange 5 and the second flange 6 are further included; the first flange 5 and the second flange 6 have bolt holes; the emission end 1 is connected with the gas inlet section 31 through the bolt holes on the first flange 5, and the receiving end 2 is connected with the gas outlet section 33 through the bolt holes on the second flange 6.

[0050] In an alternative embodiment, the first sealing member and the second sealing member are further included; the first sealing member is arranged between the emission end 1 and the gas inlet section 31, and the second sealing member is arranged between the receiving end 2 and the gas outlet section 33.

[0051] Exemplarily, the first sealing member and the second sealing member can be O-shaped sealing rings, and the first sealing member and the second sealing member can prevent the leakage of the gas to be detected and improve the detection accuracy.

[0052] In an alternative embodiment, the laser controller 8 is further included; the first end of the laser controller 8 is connected with the emission end 1 through a cable, and the second end of the laser controller 8 is connected with the receiving end 2 through a cable.

[0053] In an alternative embodiment, the gas inlet section 31 is provided with a gas inlet, and the gas inlet is used to be connected with a gas source to be detected.

[0054] Further, the gas inlet is provided with a gas inlet pipe 7, and the gas inlet pipe 7 is used to be connected with the gas source to be detected.

[0055] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to the present application without departing from the scope of the present application, and equivalent components can be substituted for the components in the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A laser oxygen analyzer, characterized in that, include: The transmitting end is used to emit a laser source; The measuring unit includes an air inlet section, an absorption section, and an air outlet section connected in sequence, wherein the diameters of the air inlet section, the absorption section, and the air outlet section increase sequentially, and the air inlet section of the measuring unit is connected to the transmitting end. A heating unit, connected to the measuring unit, is used to heat the measuring unit; The receiving end is connected to the air outlet section of the measuring unit.

2. The laser oxygen analyzer of claim 1, wherein, The heating element includes at least two sets of heating bands; One set of heating tapes is wound around the measuring part in a first direction, and the other set of heating tapes is wound around the measuring part in a second direction; The first direction is opposite to the second direction.

3. The laser oxygen analyzer of claim 2, wherein, The gap between two adjacent heating bands wound on the absorption section is greater than the gap between two adjacent heating bands wound on the air inlet section and the air outlet section.

4. The laser oxygen analyzer according to claim 2 or 3, characterized in that, The heating element also includes: a temperature sensor and a temperature controller; The temperature sensor is mounted on the absorption section, and the temperature controller is electrically connected to the temperature sensor and the heating element.

5. The laser oxygen analyzer according to claim 1, characterized in that, The outer walls of the air inlet section, absorption section and air outlet section of the measuring unit are provided with at least two sets of heating grooves, and the heating unit is connected to the measuring unit through the heating grooves.

6. The laser oxygen analyzer according to claim 1, characterized in that, The diameter of the air intake section increases along the direction from the transmitter to the receiver, the diameter of the air outlet section increases along the direction from the transmitter to the receiver, and the diameter of the absorption section remains unchanged.

7. The laser oxygen analyzer according to claim 1, characterized in that, It also includes the first flange and the second flange; The first flange and the second flange have bolt holes; The transmitting end is connected to the air inlet section through bolt holes on the first flange, and the receiving end is connected to the air outlet section through bolt holes on the second flange.

8. The laser oxygen analyzer according to claim 1, characterized in that, It also includes a first seal and a second seal; The first sealing element is provided between the transmitting end and the air inlet section, and the second sealing element is provided between the receiving end and the air outlet section.

9. The laser oxygen analyzer according to claim 1, characterized in that, It also includes a laser controller, the first end of which is connected to the transmitter via a cable, and the second end of which is connected to the receiver via a cable.

10. The laser oxygen analyzer according to claim 1, characterized in that, The air intake section is provided with an air inlet, which is used to connect to the air source to be tested.

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