Simple zero gas generating device for zero calibration of flue gas analyzer

Abstract

The utility model discloses a simple zero gas generating device for zero calibration of a flue gas analyzer, which comprises a flue gas analyzer with a built-in flue gas preprocessor, a silica gel desiccant filtering tank, a potassium permanganate oxidant filtering tank and an activated carbon filtering tank, the silica gel desiccant filtering tank, the potassium permanganate oxidant filtering tank and the activated carbon filtering tank are sequentially connected in series, the silica gel desiccant filtering tank is provided with an air inlet, an output port of the activated carbon filtering tank is connected with a sample gas inlet of a flue gas preprocessor of the flue gas analyzer, and a sample gas outlet of the flue gas preprocessor outputs zero calibration gas. The zero calibration device overcomes the defect that a traditional flue gas analyzer adopts pure nitrogen for zero calibration, is simple in structure, can completely meet the zero calibration requirement of the flue gas analyzer, reduces the labor intensity of monitoring operation, and saves the monitoring cost.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental monitoring, in particular to a simple zero gas generating device used for zeroing a flue gas analyzer. Background Art

[0002] Usually, the daily consumption of pure nitrogen in environmental monitoring laboratories is large, such as SO 2 、NO X Before and after the measurement, the flue gas analyzer needs to be calibrated with pure nitrogen. The gas chromatograph also needs to use pure nitrogen as the standard gas before sampling for gas inspection. Other large laboratory instruments also need pure nitrogen as the protective gas. Therefore, the annual cost of purchasing pure nitrogen is high. In addition, the measurement of SO in the exhaust gas of fixed pollution sources 2 、NO X When detecting SO in exhaust gas, the on-site monitoring platform will vibrate greatly, which will affect the accuracy of the flue gas analyzer and the instrument display value will be biased. 2 、NO X Pure nitrogen is used for zero calibration before and after, which consumes a lot of pure nitrogen and requires manpower to carry pure nitrogen cylinders to the monitoring platform. The labor intensity of on-site monitoring personnel is relatively high, and the cost of environmental monitoring is increased. Conventional zero gas generators cost hundreds of thousands of yuan, which is too expensive and inconvenient to carry, and cannot meet the needs of zero calibration of flue gas analyzers on on-site monitoring platforms. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a simple zero gas generating device for zeroing a flue gas analyzer. The device overcomes the defect that a traditional flue gas analyzer uses pure nitrogen for zeroing, has a simple structure, can fully meet the zeroing requirements of the flue gas analyzer, reduces the labor intensity of monitoring operations, and saves monitoring costs.

[0004] In order to solve the above technical problems, the utility model discloses a simple zero gas generating device for zeroing a flue gas analyzer, comprising a flue gas analyzer with a built-in flue gas preprocessor, a silica gel desiccant filter tank, a potassium permanganate oxidant filter tank and an activated carbon filter tank, wherein the silica gel desiccant filter tank, the potassium permanganate oxidant filter tank and the activated carbon filter tank are connected in series in sequence, the silica gel desiccant filter tank is provided with an air inlet, the output port of the activated carbon filter tank is connected to the sample gas inlet of the flue gas preprocessor of the flue gas analyzer, and the sample gas outlet of the flue gas preprocessor outputs zero gas for zeroing.

[0005] Furthermore, the input port and the output port of the silica gel desiccant filter tank, the potassium permanganate oxidant filter tank and the activated carbon filter tank are respectively arranged at the lower part and the upper part of the tank body.

[0006] Furthermore, a flow regulating valve is provided at the sample gas inlet of the flue gas preprocessor of the flue gas analyzer, and the flow regulating valve regulates the gas flow input from the activated carbon filter tank to the sample gas inlet of the flue gas preprocessor.

[0007] Since the utility model adopts the above-mentioned technical scheme for the simple zero gas generating device for zeroing the flue gas analyzer, that is, the device includes a flue gas analyzer with a built-in flue gas preprocessor, a silica gel desiccant filter tank, a potassium permanganate oxidant filter tank and an activated carbon filter tank, the silica gel desiccant filter tank, the potassium permanganate oxidant filter tank and the activated carbon filter tank are connected in series in sequence, the silica gel desiccant filter tank is provided with an air inlet, the output port of the activated carbon filter tank is connected to the sample gas inlet of the flue gas preprocessor of the flue gas analyzer, and the sample gas outlet of the flue gas preprocessor outputs the zero gas for zeroing. The device overcomes the defect of the traditional flue gas analyzer using pure nitrogen for zeroing, has a simple structure, can fully meet the zeroing requirements of the flue gas analyzer, reduces the labor intensity of the monitoring operation, and saves the monitoring cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The present invention is further described in detail below in conjunction with the accompanying drawings and implementation examples:

[0009] Figure 1 The utility model is a schematic diagram of a simple zero gas generating device used for zeroing a flue gas analyzer. DETAILED DESCRIPTION

[0010] Implementation example Figure 1 As shown, the utility model comprises a simple zero gas generating device for zeroing a flue gas analyzer, comprising a flue gas analyzer 1 with a built-in flue gas preprocessor 11, a silica gel desiccant filter tank 2, a potassium permanganate oxidant filter tank 3 and an activated carbon filter tank 4, wherein the silica gel desiccant filter tank 2, the potassium permanganate oxidant filter tank 3 and the activated carbon filter tank 4 are connected in series in sequence, the silica gel desiccant filter tank 2 is provided with an air inlet 21, the output port of the activated carbon filter tank 4 is connected to the sample gas inlet 13 of the flue gas preprocessor 11 of the flue gas analyzer 1, and the sample gas outlet 14 of the flue gas preprocessor 11 outputs the zero gas for zeroing.

[0011] Preferably, the input port and the output port of the silica gel desiccant filter tank 2, the potassium permanganate oxidant filter tank 3 and the activated carbon filter tank 4 are respectively arranged at the lower part and the upper part of the tank body.

[0012] Preferably, the sample gas inlet 13 of the flue gas preprocessor 11 of the flue gas analyzer 1 is provided with a flow regulating valve 12 , and the flow regulating valve 12 regulates the gas flow input from the activated carbon filter tank 4 to the sample gas inlet 13 of the flue gas preprocessor 11 .

[0013] When the device is used, the wet air first passes through the silica gel desiccant filter tank to remove most of the moisture, and then passes through the potassium permanganate oxidant filter tank to oxidize NO in the air into NO2 Then it passes through the activated carbon filter tank to remove SO in the air 2 , O 3 、NO 2 , CO 2 The gases are then further dried and condensed by the flue gas preprocessor to remove fine particles in the air, thereby producing pure, dry air that does not contain the components to be tested and obtaining the zero air for the flue gas analyzer.

[0014] The effect of this device was verified by using constant potential electrolysis method, non-dispersive infrared absorption method and ultraviolet absorption method flue gas analyzers that were calibrated with pure nitrogen. The zero gas produced by this device was introduced respectively. The device was verified by recording and calculating the relative error of zero point drift. The specific results are shown in the table below.

[0015] Table 1 Zero drift verification of constant potential electrolysis flue gas analyzer

[0016] Table 2 Non-dispersive infrared absorption method instrument zero drift verification

[0017] Table 3 UV absorption instrument zero drift verification

[0018] The zero gas generated by this device is introduced into the flue gas analyzer using three different analysis methods, SO 2 ,NO,NO 2 The zero drift errors are all within the specification range, indicating that the zero gas generated by this device can fully meet the zero calibration requirements of the flue gas analyzer. This device can replace pure nitrogen to calibrate the instrument.

[0019] This device uses the flue gas preprocessor (Bochun GASS-35 flue gas preprocessor) that comes with the flue gas analyzer. Three filter tanks (filled with silica gel desiccant, potassium permanganate oxidant, and activated carbon) are installed at the sample gas inlet of the preprocessor to remove moisture, SO 2 、NO X , CO 2 Impurities such as carbon monoxide and sulfur dioxide can be removed to achieve the effect of a zero gas generator, and the gas flow entering the flue gas analyzer can be controlled by the flow regulating valve, which perfectly solves the zero calibration requirement of the flue gas analyzer.

[0020] The device has a simple structure and low development cost. It can be widely promoted to various environmental monitoring institutions. It is suitable for the majority of flue gas analyzers (infrared method, ultraviolet method, constant potential method) on the market for zero calibration in quality control laboratories and on-site monitoring platforms. Since water vapor in the air greatly interferes with instrument calibration, this device uses silica gel desiccant and flue gas pretreatment to filter water in two stages to ensure that the generated zero gas is absolutely dry. The device is easy to operate and simple to maintain. You only need to regularly check and replace the three media in the filter tank according to the usage. The zero gas generation cost of this device is low. A large amount of zero gas can be used to purge the contaminated optical components in the flue gas analyzer to keep the optical components clean and increase the service life of the instrument. It can also greatly save the cost of using pure nitrogen and monitor SO in exhaust gas on-site. 2 、NO X When monitoring, only three filter tanks need to be carried to the monitoring platform, which reduces the labor cost of carrying pure nitrogen cylinders to the monitoring platform and greatly improves work efficiency.

Claims

1. A simple zero gas generating device for zeroing a flue gas analyzer, comprising a flue gas analyzer with a built-in flue gas preprocessor, characterized in that: It also includes a silica gel desiccant filter tank, a potassium permanganate oxidant filter tank and an activated carbon filter tank, which are connected in series in sequence, the silica gel desiccant filter tank is provided with an air inlet, the output port of the activated carbon filter tank is connected to the sample gas inlet of the flue gas preprocessor of the flue gas analyzer, and the sample gas outlet of the flue gas preprocessor outputs zero gas for calibration.

2. The simple zero gas generating device for zeroing a flue gas analyzer according to claim 1 is characterized in that: The input port and the output port of the silica gel desiccant filter tank, the potassium permanganate oxidant filter tank and the activated carbon filter tank are respectively arranged at the lower part and the upper part of the tank body.

3. The simple zero gas generating device for zeroing a flue gas analyzer according to claim 1 is characterized in that: A flow regulating valve is provided at the sample gas inlet of the flue gas preprocessor of the flue gas analyzer, and the flow regulating valve regulates the gas flow input from the activated carbon filter tank to the sample gas inlet of the flue gas preprocessor.

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