Exhaust gas detection equipment

Abstract

The utility model discloses exhaust gas detection equipment which is characterized in that one end of a sampling pipe is connected with an exhaust pipe to collect gas exhausted by a flue, and standard gas is introduced into the sampling pipe for primary dilution; gas in the sampling pipe is introduced into the pretreatment high-temperature box for heating, and nitrogen is introduced for secondary dilution before heating; meanwhile, nitrogen is introduced into the pretreatment high-temperature box for three-stage dilution, the gas subjected to three-stage dilution is detected through an infrared spectrum analyzer, and the detected gas is conveyed into the flue again through a discharge pipe; and comprehensive gas is introduced into the discharge pipe for leakage-proof detection. The standard gas is used for carrying out primary dilution on the sampling gas, then the nitrogen is used for further carrying out secondary dilution and tertiary dilution on the sampling gas in two paths, the dilution ratio of the nitrogen is the product number of the secondary dilution and the tertiary dilution, and compared with traditional standard gas primary dilution and nitrogen secondary dilution, the nitrogen consumption is less, and the detection cost can be greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a VOCs detection technical field more specifically, it relates to a kind of detection equipment of exhaust gas. BACKGROUND

[0002] Organic compounds with high saturated vapor pressure, low boiling point, small molecular weight and easy to volatilize at room temperature under standard conditions are one of the main pollutants of atmosphere. Volatile organic compounds participate in the formation of ozone and secondary aerosols in the atmospheric environment, which have important influence on regional atmospheric ozone pollution and PM2.5 pollution. Such volatile organic compounds have a special smell that is not suitable for people, and have toxicity, irritability, teratogenicity and carcinogenicity, especially benzene, toluene and formaldehyde, which can cause great harm to human health. Volatile organic compounds are important precursors of urban haze and photochemical smog, mainly from coal chemical industry, petroleum chemical industry, fuel coating manufacturing, solvent manufacturing and use processes.

[0003] With the strengthening of environmental awareness, enterprises will also do harmless treatment before the emission of volatile organic gases. In order to better treat volatile organic waste gas, infrared spectrum analyzer is used for online detection before and after emission, but the detection of volatile organic gas concentration by infrared spectrum analyzer is limited, so standard gas and nitrogen are needed for dilution. In conventional operation, the nitrogen source has only one gas outlet connected with the sampling pipe for collecting volatile organic waste gas, which consumes a large amount of nitrogen and has high detection cost. UTILITY MODEL CONTENT

[0004] The technical problem to be solved by the utility model is that the nitrogen consumption is large in the traditional volatile organic waste gas detection process, and the online detection cost is high, so that a detection equipment for exhaust gas with low detection cost is provided.

[0005] The technical solution adopted by the utility model to solve its technical problem is:

[0006] A detection equipment for exhaust gas, comprising a gas divider, a pretreatment high-temperature box, an infrared spectrum analyzer, a sampling pipe and a discharge pipe.

[0007] One end of the sampling pipe is connected with the smoke exhaust pipe, and the other end is connected with the first gas inlet of the gas divider, the first gas inlet of the pretreatment high-temperature box and the gas inlet of the infrared spectrum analyzer in sequence, and then connected with the discharge pipe. The discharge pipe is connected with the smoke exhaust pipe.

[0008] The second gas inlet and the third gas inlet of the gas divider are connected with a standard gas source and a nitrogen source respectively, a second gas outlet corresponding to the second gas inlet on the gas divider is connected with a sampling pipe, and a third gas outlet and a fourth gas outlet corresponding to the third gas inlet on the gas divider are provided, the third gas outlet is connected with the sampling pipe, and the fourth gas outlet is connected with a pretreatment high-temperature box.

[0009] Preferably, first, second, third and fourth air channels are arranged in the gas divider, two ends of the first air channel correspond to the first gas inlet and the first gas outlet respectively, the sampling pipe is connected to the first gas inlet and disconnected from the first gas outlet, and the first, third and fourth air channels are respectively provided with first, second and third mass flow controllers.

[0010] Preferably, the pretreatment high-temperature box comprises a filter, an air pump and a gas mixing tank connected in sequence with the sampling pipe, and the fourth gas outlet on the gas divider is connected with the gas mixing tank in gas path.

[0011] Preferably, the pipeline between the sampling pipe and the infrared spectrum analyzer is a heat tracing pipeline.

[0012] Preferably, a pilot pipe is further arranged, one end of the pilot pipe is connected with a pilot gas source, and the other end of the pilot pipe is connected with a discharge pipe.

[0013] Preferably, a fourth mass flow controller is arranged on the pilot pipe.

[0014] Preferably, a bypass pipeline is further arranged, one end of the bypass pipeline is connected with the heat tracing pipeline, and the other end of the bypass pipeline is connected with the discharge pipe.

[0015] Preferably, a float flow meter is arranged on the pipeline between the infrared spectrum analyzer and the discharge pipe.

[0016] The utility model discloses a beneficial effect is: standard gas enters the equipment and then circulates and flows and verifies the accuracy of the equipment, and then utilizes nitrogen to divide two ways to further dilute the sampling gas to the first level and the second level, and the dilution multiple of nitrogen is the product of the first level and the second level, compared with the traditional first level dilution, the nitrogen usage is less, and the detection cost can be reduced a lot. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 It is the detection flow chart of discharge gas;

[0018] Fig. 2 It is the schematic diagram of discharge gas detection equipment;

[0019] In the figure: 1, the body; 2, gas divider; 3, pretreatment high temperature box; 31, filter; 32, air pump; 33, mixed gas tank; 4, infrared spectrum analyzer; 5, sampling tube; 6, exhaust pipe; 7, exhaust pipe; 8, heat tracing line; 9, indicator tube; 10 bypass line. DETAILED DESCRIPTION

[0020] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0021] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0022] In the present application, unless otherwise stated, the orientation such as "up, down" is generally with respect to the direction shown in the drawings, or with respect to the vertical, perpendicular or gravity direction; similarly, for the convenience of understanding and description, "left, right" is generally with respect to the left and right shown in the drawings; "inner, outer" refers to the inner and outer with respect to the contour of each component itself, but the above orientation words are not used to limit the present application.

[0023] According to Figs. 1-2 As shown in the figure, a kind of detection equipment of exhaust gas, including the body 1 made of metal frame and the gas divider 2, pretreatment high temperature box 3, infrared spectrum analyzer 4, sampling tube 5 and exhaust pipe 6 installed on the body 1, the first gas inlet of gas divider 2, the first gas inlet of pretreatment high temperature box 3, the gas inlet of infrared spectrum analyzer 4 are connected by sampling tube 5 after passing, one end of sampling tube 5 is used to connect with exhaust pipe 7, the other end is connected with exhaust pipe 6, one end of exhaust pipe 6 is used to connect with exhaust pipe 7, so that the sampled volatile organic gas forms closed loop gas path. The second gas inlet and the third gas inlet on the gas divider 2 are connected with standard gas source and nitrogen source respectively, the second gas outlet corresponding to the second gas inlet on the gas divider 2 is connected with sampling tube 5, there are third gas outlet and fourth gas outlet on the gas divider 2 corresponding to the third gas inlet, the third gas outlet is connected with sampling tube 5, and the fourth gas outlet is connected with pretreatment high temperature box 3.

[0024] After standard gas enters the equipment, it circulates to verify the accuracy of the equipment, and then further diluted by one stage and two stages by nitrogen, and the dilution multiple of nitrogen is the product of one-stage dilution and two-stage dilution, compared with traditional one-stage dilution, the amount of nitrogen used is less, and the detection cost can be greatly reduced.

[0025] According to Figs. 1-2As shown, the gas divider 2 is provided with a first gas passage, a second gas passage, a third gas passage and a fourth gas passage, two ends of the first gas passage correspond to the first gas inlet and the first gas outlet respectively, the sampling pipe 5 is connected to the first gas inlet and is connected from the first gas outlet, the first gas passage, the third gas passage and the fourth gas passage are respectively provided with the first mass flow controller, the second mass flow controller and the third mass flow controller. The fourth mass flow controller is installed on the summary pipe 9, one end of the summary pipe 9 is connected to the summary gas source, and the other end is connected to the discharge pipe 6. The tracer gas is used for better and faster online detection of whether the whole gas circuit leaks. If the gas circuit pipeline exists leakage, the concentration of tracer gas at the leakage position will be obviously higher than that of other parts, so that the pipeline gas leakage detector can be quickly detected. The tracer gas in the present application includes helium, nitrogen or argon, and helium is preferably selected.

[0026] According to Figs. 1-2 As shown, the first mass flow controller, the second mass flow controller, the third mass flow controller and the fourth mass flow controller are provided with valves for controlling the size of the gas flow at the front and rear ends, the pretreatment high-temperature box 3 includes a box body and a filter 31, an air pump 32 and a gas mixing tank 33 installed in the box body, the filter 31 is connected with the first gas outlet of the gas divider 2, the air pump 32 is connected with the filter 31, the gas mixing pipe is connected with the air pump 32, the infrared spectrum analyzer 4 is connected with the gas mixing tank 33, and the fourth gas outlet on the gas divider 2 is connected with the gas circuit of the gas mixing tank 33.

[0027] According to Figs. 1-2 As shown, the box body of the pretreatment high-temperature box 3 is provided with an electric heating device for heating the sampling gas, such as an electric heating wire, the heating device can be installed on the inner wall of the box body, or can be arranged in the gas mixing tank 33, or can be wound on the gas circuit pipeline in a right or spiral manner. The pipeline between the sampling pipe 5 and the infrared spectrum analyzer 4 is set as a heat tracing pipeline 8, the heat tracing pipeline 8 is set to protect the temperature of the gas passing between the gas mixing tank 33 and the infrared spectrum analyzer 4, and is composed of heat insulation cotton wrapped outside the pipe wall.

[0028] According to Figs. 1-2 As shown, the infrared spectrum analyzer 4 is further provided with a bypass pipeline 10 at the gas inlet, one end of the bypass pipeline 10 is connected with the heat tracing pipeline 8, and the other end is connected to the discharge pipe 6. The float flow meter is installed on the pipeline between the infrared spectrum analyzer 4 and the discharge pipe 6 and above the infrared spectrum analyzer 4. The gas flowing out of the gas mixing tank 33 flows to the infrared spectrum analyzer 4 and flows into the discharge pipe 6 from the bypass pipeline 10, so as to avoid too much gas or too fast flow rate flowing into the infrared spectrum analyzer 4, which affects the actual detection effect. In addition, because the detection equipment is online detection at any time, the setting of the bypass pipeline 10 is also convenient for the maintenance and maintenance of the infrared spectrum analyzer 4.

[0029] A flue gas detection method,

[0030] The flue gas is collected by the sampling pipe 5, and is input into a standard gas verification detection device to verify the accuracy of the detection device;

[0031] The gas in the sampling pipe 5 is input into the pre-treatment high-temperature box 3 to be heated, and nitrogen is input to perform first-stage dilution before heating;

[0032] Meanwhile, nitrogen is input into the pre-treatment high-temperature box 3 to perform second-stage dilution, the gas after the second-stage dilution is detected by the infrared spectrum analyzer 4, and the gas after the detection is re-transported into the flue by the discharge pipe 6;

[0033] The valve on the tracer pipe is opened, and tracer gas is input into the discharge pipe 6 through the gas divider (2).

[0034] The detection method of the utility model, not only can reduce the detection cost, reduce the nitrogen consumption, and the detection safety is higher, one aspect is before the volatile organic waste gas detection, the gas circuit of the detection device is detected by the standard gas, the smoothness of the detection circuit and whether it leaks, on the other hand, the gas circuit is detected online by the tracer gas, avoids the gas circuit leakage and cannot be repaired quickly, affects the normal detection of volatile organic waste gas, because, once the detection device is installed in the volatile organic waste gas treatment process device, the detection device stops working, the volatile organic waste gas cannot be transported normally, so that the whole production line cannot work normally, causes the economic loss is bigger.

[0035] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments consistent with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0036] It should be noted that the terms "first", "second", and the like, as used in the specification and claims herein, are used to distinguish between similar objects, and are not necessarily used to describe a particular sequential or chronological order. It is understood that the use of such terms in the description is not intended to exclude from the scope of the application embodiments of the application that do not include all of the recited features or steps.

[0037] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An exhaust gas detection device, characterized by: It includes a gas divider (2), a pretreatment high temperature box (3), an infrared spectrometer (4), a sampling tube (5) and a discharge tube (6); One end of the sampling tube (5) is used to connect to the smoke exhaust pipe (7), and the other end is connected in sequence to the first air inlet of the gas divider (2), the first air inlet of the pretreatment high-temperature box (3), the air inlet of the infrared spectrum analyzer (4), and then connected to the exhaust pipe (6), and the exhaust pipe (6) is used to connect to the smoke exhaust pipe (7); The second air inlet and the third air inlet of the gas divider (2) are connected to the standard gas source and the nitrogen source respectively. The second air outlet corresponding to the second air inlet on the gas divider (2) is connected to the sampling tube (5). The third air outlet and the fourth air outlet corresponding to the third air inlet on the gas divider (2) are connected. The third air outlet is connected to the sampling tube (5), and the fourth air outlet is connected to the pretreatment high-temperature box (3).

2. The exhaust gas detection device according to claim 1, characterized in that: The gas divider (2) is provided with a first air channel, a second air channel, a third air channel and a fourth air channel, the two ends of the first air channel correspond to the first air inlet and the first air outlet respectively, the sampling tube (5) is connected from the first air inlet and is connected from the first air outlet, and the first air channel, the third air channel and the fourth air channel are respectively installed with a first mass flow controller, a second mass flow controller and a third mass flow controller.

3. The exhaust gas detection device according to claim 2, characterized in that: The pretreatment high-temperature box (3) comprises a filter (31) connected to the sampling tube (5), an air pump (32) and a gas mixing tank (33) in sequence, and the fourth gas outlet on the gas divider (2) is connected to the gas circuit of the gas mixing tank (33).

4. The exhaust gas detection device according to claim 3, characterized in that: The pipeline connecting the sampling pipe (5) to the pretreatment high-temperature box (3) and the infrared spectrum analyzer (4) is configured as a heating pipeline (8).

5. The exhaust gas detection device according to claim 4, characterized in that: Also includes The integrated pipe (9) is shown, one end of the integrated pipe (9) is connected to the integrated gas source, and the other end is connected to the discharge pipe (6).

6. The exhaust gas detection device according to claim 5, characterized in that: A fourth mass flow controller is installed on the integrated pipe (9).

7. The exhaust gas detection device according to claim 6, characterized in that: It also includes a bypass pipeline (10), one end of which is connected to the heating pipeline (8) and the other end of which is connected to the discharge pipe (6).

8. The exhaust gas detection device according to claim 7, characterized in that: A float flowmeter is installed on the pipeline between the infrared spectrum analyzer (4) and the discharge pipe (6).

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