Online detection device for trace water in corrosive gas

Abstract

The utility model relates to the technical field of flue gas acid making, in particular to an online detection device for trace water in corrosive gas. The device comprises an air inlet valve, a sampling electromagnetic valve, a sample gas filter, a sample gas flow cell, a float flowmeter, an exhaust electromagnetic valve and an exhaust valve which are sequentially connected through a sampling pipeline, and further comprises a sampling / reverse blowing switching valve which is arranged on a pipeline for connecting an outlet of the air inlet valve with an outlet of the exhaust electromagnetic valve; a back flushing electromagnetic valve is further arranged on a pipeline of an outlet of the gas inlet valve, a micro-water sensor connected to a micro-water analyzer is arranged in the sample gas filter, and the micro-water sensor is used for measuring micro-water by converting the water content into an electric signal. The device can realize on-line continuous measurement, is stable and reliable in operation and highly accurate in measured value, solves the problem of control lag caused by discontinuity of traditional manual measurement, and effectively improves the stability and safety of the production process.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of flue gas acid making, and specifically relates to an on-line detection device for trace water in corrosive gas. BACKGROUND

[0002] In the complex production process of flue gas acid making, the moisture content of flue gas at the outlet of sulfur dioxide fan plays a decisive role. When the flue gas contains a certain amount of moisture, it will bring many adverse effects to production: first, the moisture will form dew condensation on the surface of the fan impeller, which not only reduces the working efficiency of the fan, but also affects its performance. With the passage of time, this dew condensation may cause damage to the surface of the impeller, further reducing the service life of the fan; secondly, when the dew point of flue gas rises, moisture will gradually accumulate inside the equipment and pipelines. This not only accelerates the corrosion process of the equipment, but also may cause pipeline blockage, affecting the normal production; in addition, excessive moisture will cause the catalyst to crumble and harden, thereby increasing the resistance of the catalyst layer, reducing the activity of the catalyst, and affecting the efficiency of the entire conversion process; moisture will also react with sulfur trioxide, further corroding the conversion equipment and pipelines, increasing the cost of equipment maintenance and replacement.

[0003] At present, in the process of flue gas acid making, the artificial measurement method is generally used to measure the moisture content in flue gas at regular intervals. However, this method has obvious shortcomings. On the one hand, the accuracy of artificial measurement is relatively low, which is difficult to meet the requirements of accurate control of moisture content. On the other hand, due to discontinuous measurement, it often leads to control lag, causing certain damage to equipment and production process. In addition, artificial measurement also needs to consume a lot of manpower and time, increasing the production cost. SUMMARY

[0004] Therefore, in order to solve the problems of discontinuous measurement, low accuracy, control lag and other problems existing in traditional artificial measurement in the prior art, the utility model provides an on-line detection device for trace water in corrosive gas with high accuracy and on-line continuous, and the specific technical scheme is as follows:

[0005] The device for on-line detection of trace water in corrosive gas comprises a gas inlet valve, a sampling electromagnetic valve, a sample gas filter, a sample gas flow cell, a float flow meter, a gas outlet electromagnetic valve, a gas outlet valve and a sampling / reverse blowing switching valve, which are connected in sequence through sampling pipelines.

[0006] Further, the filter cavity of the sample gas filter is provided with staggered flow guide plates.

[0007] Further, the filter cavity of the sample gas filter is provided with grooves in the inner wall, and the flow guide plates are movably inserted into the grooves.

[0008] Further, the sample gas flow cell is provided with a mounting hole with internal threads at the top, and the top shell of the micro water sensor is provided with matching external threads, so that the sample gas flow cell and the micro water sensor are connected through threads.

[0009] Further, the electrodes in the micro water sensor are platinum or rhodium wires.

[0010] Further, the drying agent coated on the surface of the electrodes is phosphorus pentoxide.

[0011] Further, the micro water analyzer is provided with a signal amplifier.

[0012] Further, the gas inlet end of the reverse blowing electromagnetic valve is connected to an external compressed air source through a pipeline, and the gas outlet end is connected to the sampling / reverse blowing switching valve.

[0013] The device for on-line detection of trace water in corrosive gas comprises a gas inlet valve, a sampling electromagnetic valve, a sample gas filter, a sample gas flow cell, a float flow meter, a gas outlet electromagnetic valve, a gas outlet valve and a sampling / reverse blowing switching valve, which are connected in sequence through sampling pipelines.

[0014] (1) the device utilizes the micro water sensor, phosphorus pentoxide is arranged on the electrode, water can be absorbed from the sample gas to realize the detection of trace water, the electrode current is proportional to the water content, the water content is converted into an electric signal for real-time monitoring; in addition, the sample gas is pretreated by arranging a sample gas filter to remove impurities therein, the filter chamber in the filter is arranged in an inclined state, solid impurities are gathered on the inlet side by gravity, so as to avoid the outlet side from being blocked, a flow guide plate is arranged to improve the filtering effect; in addition, threads are arranged at the connection between the sample gas flow cell and the micro water sensor, so as to facilitate disassembly and replacement and improve the sealing performance; a back flushing valve is further arranged to back flush and clean the pipeline and the exhaust pipeline of the sampling end;

[0015] (2) the device has high automation degree, can realize real-time monitoring of the water content in the flue gas, discovers the change of the water content in time, provides accurate data support for the control of the production process, solves the control lag problem caused by discontinuous manual measurement, effectively improves the stability and safety of the production process, reduces the time and manpower required by manual measurement, and improves the production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0016] The embodiments of the present application will be further described below with reference to the drawings, in which:

[0017] Figure 1 The structure of the present application is shown in the schematic diagram;

[0018] Figure 2 The connection relationship between the electromagnetic valve and the control system in the present application is shown.

[0019] Among them, 1: gas valve, 2: sampling electromagnetic valve, 3: sample gas filter, 4: sample gas flow cell, 5: float flowmeter, 6: exhaust electromagnetic valve, 7: exhaust valve, 8: sampling / back flushing switching valve, 9: back flushing electromagnetic valve, 10: micro water sensor. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0021] In one embodiment, an on-line detection device for trace water in corrosive gas includes, in sequence, an inlet valve 1, a sampling electromagnetic valve 2, a sample gas filter 3, a sample gas flow cell 4, a float flow meter 5, an exhaust electromagnetic valve 6, an exhaust valve 7, and a sampling / back flushing switching valve 8, which is arranged on the pipeline connecting the outlet of the inlet valve 1 and the outlet of the exhaust electromagnetic valve 6. A back flushing electromagnetic valve 9 is also arranged on the pipeline of the outlet of the inlet valve 1. The inlet of the back flushing electromagnetic valve 9 is connected to an external compressed air source through a pipeline, and the outlet of the back flushing electromagnetic valve 9 is connected to the sampling / back flushing switching valve 8. The sample gas filter 3 is internally provided with an inclined filter cavity, which is lower at the upstream end than at the downstream end. The filter cavity is internally provided with staggered flow guides, and the inner wall of the filter cavity is provided with grooves, in which the flow guides are movably inserted. The number and corresponding positions of the flow guides can be designed according to actual conditions. The sample gas flow cell 4 is provided with a micro water sensor 10. The top of the sample gas flow cell 4 is provided with a threaded mounting hole, and the top of the micro water sensor 10 is provided with a matching external thread. The sample gas flow cell 4 and the micro water sensor 10 are connected through the threads, which facilitates disassembly and has good sealing performance. The micro water sensor 10 includes a glass cylinder and two parallel electrodes made of platinum or rhodium wire. The surface of the electrodes is coated with a desiccant, phosphorus pentoxide. The micro water sensor 10 is connected to a micro water analyzer, which is provided with a signal amplifier. The inlet valve 1, the sampling electromagnetic valve 2, the exhaust electromagnetic valve 6, the sampling / back flushing switching valve 8, and the back flushing electromagnetic valve 9 are electrically connected to a control system.

[0022] When sampling and analyzing, the intake valve 1 is opened, the control system controls the sampling electromagnetic valve 2 and the exhaust electromagnetic valve 6 to be opened, and controls the sampling / anti-blowing switching valve 8 and the anti-blowing electromagnetic valve 9 to be closed, so that the sample gas enters the sampling electromagnetic valve 2 through the sampling pipeline, the amount of gas entering the analyzing device can be controlled by adjusting the sampling electromagnetic valve 2, then the sample gas enters the sample gas filter 3 to remove impurities, so as to prevent the impurities from damaging the sensor, then the sample gas enters the sample gas flow cell 4, the moisture in the sample gas is absorbed by the desiccant P2O5 on the electrode of the micro water sensor 10, based on the Faraday electrolysis principle, a certain voltage is applied between the two electrodes, so that the water molecules are electrolyzed under the action of the electrode, and the desiccant can absorb the water from the sample gas, so as to ensure the continuous electrolysis, and finally the water content in the sample gas and the water content after electrolysis are balanced. At this time, the electrode current is proportional to the water content in the sample gas, the water content in the sample gas is determined by measuring the size of the electrode current, the signal is converted into readable water content data after being processed by the signal amplifier inside the micro water analyzer, and is displayed and stored, and the micro water analyzer sends the signal to the control system. Then the sample gas is discharged to the production system negative pressure pipeline through the float flow meter 5, the exhaust electromagnetic valve 6 and the exhaust valve 7, so as to prevent pollution to the environment. When the flow detected in the float flow meter 5 is too large or the signal in the micro water analyzer is too high, the control system controls the sampling electromagnetic valve 2 to reduce the opening degree, and vice versa.

[0023] Every fixed time, the control system controls the sampling electromagnetic valve 2 and the exhaust electromagnetic valve 6 to be closed, and controls the sampling / anti-blowing switching valve 8 and the anti-blowing electromagnetic valve 9 to be opened, so that the anti-blowing electromagnetic valve 9 is connected to the external compressed air source through the pipeline, and the pipeline at the sampling end and the pipeline at the exhaust end are anti-blowed to remove residual gas.

[0024] Some example embodiments of the utility model are described above, and it can be understood that the above embodiments are only used to explain the utility model, and do not constitute the limitation on the protection scope of the utility model. The features in these embodiments can be recombined in a suitable manner, and the schemes obtained thereby are still within the protection scope required by the utility model. Based on the above embodiments, all other embodiments obtained by the person skilled in the art without creative labor, namely all modifications, equivalent replacements and improvements made within the spirit and principles of the present application, are within the protection scope required by the utility model.

Claims

1. An apparatus for on-line detection of trace water in a corrosive gas, characterized by, The device comprises an air inlet valve (1), a sampling electromagnetic valve (2), a sample gas filter (3), a sample gas flow cell (4), a float flow meter (5), an air outlet electromagnetic valve (6), an air outlet valve (7) connected in sequence through a sampling pipeline, and a sampling / reverse blowing switching valve (8) arranged on the pipeline connecting the outlet of the air inlet valve (1) and the outlet of the air outlet electromagnetic valve (6), and a reverse blowing electromagnetic valve (9) arranged on the pipeline of the outlet of the air inlet valve (1); the sample gas filter (3) is internally provided with an inclined filter cavity, the upstream end of the filter cavity is lower than the downstream end; the sample gas flow cell (4) is provided with a micro water sensor (10), the micro water sensor (10) comprises a glass cylinder and two parallel electrodes, the surface of the electrode is coated with a drying agent, the micro water sensor (10) is connected with a micro water analyzer, and the sampling electromagnetic valve (2), the air outlet electromagnetic valve (6), the sampling / reverse blowing switching valve (8), the reverse blowing electromagnetic valve (9), the micro water analyzer and the control system are electrically connected.

2. The apparatus for on-line detection of trace water in corrosive gas according to claim 1, wherein, The filter cavity of the sample gas filter (3) is internally provided with staggered guide plates.

3. The apparatus for on-line detection of trace water in corrosive gas according to claim 2, wherein, The filter cavity of the sample gas filter (3) is internally provided with staggered guide plates.

4. The apparatus for on-line detection of trace water in corrosive gas according to claim 1, wherein, The top of the sample gas flow cell (4) is provided with a mounting hole with an internal thread, the top of the micro water sensor (10) is provided with a matching external thread, and the sample gas flow cell (4) and the micro water sensor (10) are connected through threads.

5. The apparatus for on-line detection of trace water in corrosive gas according to claim 1, wherein, The electrode in the micro water sensor (10) is a platinum or rhodium wire.

6. The apparatus for on-line detection of trace water in corrosive gas according to claim 1, wherein, The drying agent coated on the surface of the electrode is phosphorus pentoxide.

7. The apparatus for on-line detection of trace water in corrosive gas according to claim 1, wherein, The micro water analyzer is provided with a signal amplifier.

8. The apparatus for on-line detection of trace water in corrosive gas according to claim 1, wherein, The air inlet end of the reverse blowing electromagnetic valve (9) is connected with an external compressed air source through a pipeline, and the air outlet end is connected with the sampling / reverse blowing switching valve (8).

Images