A grain silo phosphine leak monitoring device

Abstract

The application discloses a grain storehouse phosphine leakage monitoring device, which can realize real-time monitoring on the concentration and concentration gradient change state of phosphine in a grain storehouse. The internal monitoring unit is arranged to monitor the inventory and variable of the internal phosphine gas. The spectrum analyzer comparison is carried out on the gas inventory of specific wavelengths at the near end and the far end of the storehouse at the position of the monitoring box through the screening method, so that multiple key sampling can be formed, the influence of a single point is avoided, and safety is ensured. The dynamic analysis on a large amount of trace phosphine gas in the air can be carried out through reaction elimination and spectrum analysis, and the analysis range is wide. The variable analysis is carried out through the data connection of the internal and external monitoring units, and the safety analysis and control on the leakage or emission of phosphine are carried out.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of safety monitoring, especially to the field of dangerous gas monitoring, and particularly to a grain store phosphine leakage monitoring device. BACKGROUND

[0002] Grain is related to people's livelihood, and under the existing technical conditions, in order to protect the safety of the grain in the warehouse, including finished grain, raw grain, oil, dried potato, seed grain and other grain, and to avoid the occurrence of insect pests, it is necessary to take insecticidal measures. Among them, a certain amount of aluminum phosphide drug is buried in the grain pile under sealed conditions, so that the phosphorus compound absorbs the water in the gap of the grain pile and produces a chemical reaction to release the toxic gas phosphine, so as to achieve the effect of killing various pests and insect eggs in the grain pile. The phosphine is an inorganic compound with the chemical formula PH3, which is a colorless, toxic and flammable gas. Pure phosphine gas is colorless and odorless, but when metal phosphorus produces phosphine gas, it often has the smell of acetylene or garlic or rotten fish. If trace amounts of other phosphorus hydrides such as ethyl phosphine are encountered, it can cause spontaneous combustion. Therefore, very strict monitoring means are used in industry to monitor phosphine to prevent its leakage or exceed the expected diffusion range. When it meets water or absorbs moisture, it can deliquesce and release toxic phosphine gas. Therefore, a phosphine gas monitor must be installed during the fumigation of the grain store. The phosphine monitoring instrument used in the prior art monitors the concentration of phosphine in the environment, and the operation is carried out after the concentration of phosphine in the environment is monitored by the phosphine monitor to meet the standard.

[0003] The phosphine monitor measures the concentration during the fumigation process, and the general range is 0-2000ppm. Another type measures the residual concentration after fumigation, and the general range is 0-20ppm. When measuring the fumigation process, the sampling point is monitored, and when measuring the residual, it is carried on the body. The phosphine gas monitor monitors the concentration in the grain store in real time, and when the concentration exceeds the set alarm value, it will issue an audible and visual alarm function to remind the operator to take protective measures in time, and to link the electromagnetic valve, exhaust fan and other equipment. However, the existing technology can only roughly measure the state of phosphine gas near the instrument, but cannot monitor the overall environment in the grain store in real time, and cannot provide prospective data feedback for large-scale operations. Point measurement cannot cover other positions in the grain store, especially when the grain store is damaged and the phosphine leakage problem is faced. SUMMARY

[0004] The present application provides a grain store phosphine leakage monitoring method to overcome the deficiencies in the prior art. The concentration and internal circulation flow of phosphine gas in the grain store are monitored by an internal circulation monitoring system, and the external temperature sensing system is used for auxiliary monitoring to monitor the concentration and concentration gradient change of phosphine in the grain store in real time.

[0005] Preferably, the monitoring method includes monitoring the sampling points laid in the pipeline inside the warehouse, comparing in real time, starting the comparison air inlet fan, opening the comparison sampling valve, closing the comparison sampling valve after measuring the set pressure, stopping the comparison air inlet fan, spraying the reaction solution in the comparison cavity with the reaction eliminator to react and eliminate the phosphine gas in the comparison cavity, and recording the spectrum of the comparison cavity after reaction elimination by the spectrum analyzer;

[0006] Opening the proximal end air inlet fan, opening the proximal end air inlet valve, closing the proximal end air inlet valve after measuring the set pressure, stopping the proximal end air inlet fan, spraying the same volume of distilled water in the measurement cavity with the reaction eliminator, and recording the spectrum in the measurement cavity after reaction elimination by the spectrum analyzer;

[0007] After recording is completed, start the discharge pipe to discharge part of the gas and solution in the measurement cavity;

[0008] Start the comparison air inlet fan in reverse, open the comparison sampling valve, and discharge the gas and solution in the comparison cavity;

[0009] Opening the distal end air inlet fan, opening the distal end air inlet valve, closing the distal end air inlet valve after measuring the set pressure, stopping the distal end air inlet fan, spraying the same volume of distilled water in the measurement cavity with the reaction eliminator, and recording the spectrum in the measurement cavity after reaction elimination by the spectrum analyzer;

[0010] After recording is completed, start the discharge pipe to discharge part of the gas and solution in the measurement cavity;

[0011] By comparing and calculating the difference after consumption, the concentration of phosphine gas at the proximal and distal sampling tube openings is recorded respectively.

[0012] Preferably, the first sampling is recorded as SP1, the second sampling is recorded as SP2, the difference between SP2 and SP1 is i=SP2-SP1, the change value of i is analyzed by N rounds of difference statistics, when the change value of i increases by more than a set amount, the release rate of phosphine is adjusted, when the change value of i decreases by more than a set amount, the release amount of the phosphine release device is compared, and the external monitoring unit is started.

[0013] Preferably, the monitoring platform is driven to move around the track frame, the infrared radar samples the change of the infrared features outside the warehouse, the sampling state of point A on the outer surface of the warehouse when the monitoring platform is at L1 point is compared with the sampling state of point A when the monitoring platform is at L2 point, the historical environmental temperature measured by the temperature measuring sensor is read and compared with the record of the infrared radar, and the dissipation of phosphine on the outer surface of the warehouse is monitored.

[0014] A monitoring device based on the grain warehouse phosphine leakage monitoring method, comprising an internal monitoring unit and an external monitoring unit, the internal monitoring unit comprising a monitoring box, a spectrum analyzer, a counter, an air inlet pipe and a discharge system, the monitoring box is divided into a measurement cavity and a comparison cavity by a partition, the measurement cavity is connected with a proximal air inlet pipe and a distal air inlet pipe, the top of the measurement cavity is communicated with a measurement cavity counter, the discharge system is communicated with the bottom of the measurement cavity, a comparison collection pipe is inclined and communicated with the lower part of the comparison cavity, and the top of the measurement cavity and the top of the comparison cavity are respectively provided with the spectrum analyzer.

[0015] Preferably, the external monitoring unit comprises a track frame, a moving module and a monitoring module, the track frame is arranged around the upper part of the warehouse body of the grain warehouse, the moving module comprises a guide frame and a guide wheel, the upper and lower ends of the guide frame are respectively sleeved with guide wheels, the two guide wheels are respectively clamped on the top surface and the bottom surface of the track frame, and the monitoring module comprises a monitoring platform, and the top of the monitoring platform is provided with an infrared radar and a temperature sensor.

[0016] Preferably, the rear part of the guide frame is provided with a longitudinally extending support, and the side wall of the longitudinally extending support is provided with a spherical stabilizing roller, the stabilizing roller is in contact with the track frame, so as to stabilize the running direction of the moving module.

[0017] Preferably, the infrared radar is inclined and provided with upper and lower scanning surfaces, respectively, to monitor the infrared state of the top outer wall of the warehouse body and the side outer wall of the warehouse body, and the temperature sensor is arranged on the both sides of the monitoring platform and is arranged in a light-proof manner, to monitor and record the air temperature near the monitoring platform.

[0018] Preferably, the counter is provided with a storage cavity, an atomizer and a flow control valve, the counter arranged at the top of the comparison cavity is a comparison cavity counter, the storage cavity in the comparison cavity counter stores potassium permanganate solution, the counter arranged at the top of the measurement cavity is a measurement cavity counter, a water storage tank is arranged at the top of the measurement cavity counter, the water storage tank is connected with the atomizer of the measurement cavity at the bottom, the nozzle of the atomizer is located above the measurement cavity, and a pressure sensor is fixedly arranged in the measurement cavity and the comparison cavity.

[0019] Preferably, the proximal air inlet pipe is provided with a proximal air inlet valve and a proximal air inlet fan, the distal air inlet pipe is provided with a distal air inlet valve and a distal air inlet fan, the distal air inlet pipe is arranged at the front of the monitoring box, a hose is connected to the air inlet pipe of the distal air inlet pipe, the hose is arranged at the bottom of the warehouse, the distal air inlet valve is arranged at the rear of the distal air inlet fan, the distal air inlet valve is an electromagnetic valve, the contrast collection pipe is arranged on the right outer wall of the monitoring box, the contrast collection pipe is in communication with the contrast cavity, the height of the connection between the contrast collection pipe and the monitoring box is higher than the height of the inlet of the contrast collection pipe, the contrast collection pipe is provided with a contrast air inlet fan, the contrast collection pipe is provided with a contrast collection valve, and the discharge system comprises a discharge pipe and a discharge valve.

[0020] Compared with the prior art, the beneficial effects of the present application are: by arranging an external monitoring unit and an external field wide sensing device, the leakage risk of phosphine gas is monitored, and the fire alarm function is also considered; by arranging an internal monitoring unit, the inventory and variable of internal phosphine gas are monitored; by using the screening method, the spectrum analyzer comparison of the inventory of specific wavelength gas at the proximal and distal positions of the monitoring box in the warehouse is carried out, multiple key sampling can be formed, the influence of a single point is avoided, and safety is ensured; by reaction elimination and spectrum analysis, a large amount of trace phosphine gas in the air can be dynamically analyzed, the analysis range is wide, compared with a large number of arranged electrochemical heating sensors, the consumption is small, the response is fast, the safety is high, and the sampling frequency is controllable; by connecting the data of the internal and external monitoring units, the variable analysis is carried out, and the leakage or discharge of phosphine is analyzed and controlled. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be described below. Obviously, the technical solutions described in the description in combination with the drawings are only some embodiments of the present application, and for those skilled in the art, other embodiments and drawings can be obtained without creative labor on the basis of the embodiments shown in the drawings.

[0022] Figure 1 is a perspective structural schematic view of the internal monitoring unit of the monitoring device of the present application.

[0023] Figure 2 is a perspective structural schematic view of the internal monitoring unit of the monitoring device of the present application.

[0024] Figure 3 is a left side view of the internal monitoring unit of the monitoring device of the present application.

[0025] Figure 4 is the right side schematic diagram of the internal monitoring unit of the monitoring device of the application.

[0026] Figure 5 is the internal section schematic diagram of the monitoring box of the internal monitoring unit of the monitoring device of the application.

[0027] Figure 6 is the three-dimensional structure schematic diagram of the external monitoring unit of the monitoring device of the application.

[0028] Figure 7 is the left side schematic diagram of the external monitoring unit of the monitoring device of the application.

[0029] Figure 8 is the top view schematic diagram of the external monitoring unit structure of the monitoring device of the application.

[0030] Figure 9 is the side section schematic diagram of the external monitoring unit structure of the monitoring device of the application.

[0031] In the figure: 1-track frame, 11-monitoring head, 12-monitoring platform, 13-guide frame, 14-guide wheel, 15-stable roller, 2-infrared radar, 21-temperature sensor, 3-warehouse body, 4-monitoring box, 41-spectrum analyzer, 42-anti-consumption device, 5-near-end air inlet pipe, 51-near-end air inlet valve, 52-near-end air inlet fan, 6-far-end air inlet pipe, 61-far-end air inlet valve, 62-far-end air inlet fan, 7-contrast collection pipe, 71-contrast collection valve, 72-contrast air inlet fan, 8-discharge pipe, 81-discharge valve, 9-measuring cavity, 91-contrast cavity. DETAILED DESCRIPTION

[0032] The technical solutions of the embodiments of the application will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments described in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0033] The maximum allowable concentration of phosphine in the air of the working environment in China is 3mg / m3, i.e. 0.22mL / m3, which is equivalent to 2ppm. In order to protect the life safety of personnel, it is necessary to monitor the working environment in the operating state and the environment in the warehouse in the storage state, and to prevent uncontrollable leakage of phosphine.

[0034] In the embodiment of the application, a monitoring method is used to monitor the concentration and internal circulation flow of phosphine gas in the warehouse through an internal circulation monitoring system, and to perform auxiliary monitoring in combination with an external temperature sensing system, so as to perform real-time monitoring on the concentration and concentration gradient change state of phosphine in the warehouse.

[0035] The monitoring method comprises monitoring the sampling points of the pipeline laid in the grain depot,

[0036] Start the comparison air inlet fan 72, open the comparison sampling valve 71, close the comparison sampling valve 71 after the set pressure is measured, stop the comparison air inlet fan 72, and the reaction solution is sprayed by the reaction eliminator 42 in the comparison cavity 91 to react and eliminate the phosphine gas in the comparison cavity 91, and the spectrum analyzer records the spectrum in the comparison cavity 91 after the reaction elimination;

[0037] Open the proximal end air inlet fan 52, open the proximal end air inlet valve 51, close the proximal end air inlet valve 51 after the set pressure is measured, stop the proximal end air inlet fan 52, and the reaction eliminator 42 sprays the same volume of distilled water in the measurement cavity 9, and the spectrum analyzer records the spectrum in the measurement cavity 9 after the reaction elimination;

[0038] After the recording is completed, the discharge pipe 8 is started to discharge part of the gas and solution in the measurement cavity 9;

[0039] The comparison air inlet fan 72 is started in reverse, and the comparison sampling valve 71 is opened to discharge the gas and solution in the comparison cavity 91;

[0040] Open the distal end air inlet fan 62, open the distal end air inlet valve 61, close the distal end air inlet valve 61 after the set pressure is measured, stop the distal end air inlet fan 62, and the reaction eliminator 42 sprays the same volume of distilled water in the measurement cavity 9, and the spectrum analyzer records the spectrum in the measurement cavity 9 after the reaction elimination;

[0041] After the recording is completed, the discharge pipe 8 is started to discharge part of the gas and solution in the measurement cavity 9;

[0042] The difference value after consumption is calculated by comparison, and the phosphine gas concentration states at the proximal end and distal end sampling pipe openings are recorded respectively.

[0043] After the first round of sampling, SP1 is recorded, and after the second round of sampling, SP2 is recorded, the change difference is i=SP2-SP1, the change value of i is analyzed by N rounds of difference value statistics, when the change value of i increases by more than a set amount, the release rate of phosphine is adjusted, when the change value of i decreases by more than a set amount, the release amount of the phosphine release device is compared, and an external monitoring unit is started;

[0044] The monitoring platform 12 is driven to move around the track frame 1, the infrared radar 2 samples the change of the infrared features outside the grain depot, the sampling state of point A on the surface of the grain depot when the monitoring platform 12 is at L1 point is compared with the sampling state of point A when the monitoring platform 12 is at L2 point, the historical environmental temperature state measured by the temperature measuring sensor 21 is read and compared with the record of the infrared radar 2, and the dissipation of phosphine on the surface outside the grain depot is monitored.

[0045] A device according to the monitoring method, such as Figures 1 to 5As shown, including internal monitoring unit and external monitoring unit, the internal monitoring unit includes monitoring box 4, spectral analyzer 41, anti-consumption device 42, intake pipe and exhaust system. The monitoring box 4 is divided into measuring cavity 9 and contrast cavity 91 by partition. The chambers are respectively provided with pressure sensors. Four sets of mounting plates are symmetrically arranged on the upper part of the two sides of the monitoring box 4. Two sets of spectral analyzers are arranged on the top of the monitoring box 4. The bottom of the spectral analyzer is communicated with the top of the measuring cavity 9 and the contrast cavity 91 respectively. Two sets of anti-consumption devices 42 are arranged on the top of the monitoring box 4. The anti-consumption device 42 is respectively communicated with the top of the measuring cavity 9 and the contrast cavity 91. The anti-consumption device 42 is provided with a storage cavity, an atomizer and a flow control valve. The anti-consumption device 42 arranged on the top of the contrast cavity 91 is a contrast cavity anti-consumption device 42. The storage cavity in the contrast cavity anti-consumption device 42 stores potassium permanganate solution. The atomizer is arranged at the bottom of the anti-consumption device 42. The atomizer nozzle is located above the contrast cavity 91. The anti-consumption device 42 arranged on the top of the measuring cavity 9 is a measuring cavity anti-consumption device 42. The top of the measuring cavity anti-consumption device 42 is provided with a water storage tank. The water storage tank is connected with the atomizer of the measuring cavity 9 at the bottom. The atomizer nozzle is located above the measuring cavity 9. The intake pipe includes proximal intake pipe 5, distal intake pipe 6 and contrast collection pipe 7. The proximal intake pipe 5 is provided with proximal intake valve 51 and proximal intake fan 52. The proximal intake valve 51 is arranged behind the proximal intake fan 52. The proximal intake valve 51 is an electromagnetic valve. By controlling the opening and closing of the proximal intake valve 51, the proximal intake pipe 5 and the measuring cavity 9 are divided and closed. The distal intake pipe 6 is provided with distal intake valve 61 and distal intake fan 62. The distal intake pipe 6 is arranged in front of the monitoring box 4. The intake pipe port of the distal intake pipe 6 is connected with a hose. The hose port is arranged at the bottom of the granary. The distal intake valve 61 is arranged behind the distal intake fan 62. The distal intake valve 61 is an electromagnetic valve. By controlling the opening and closing of the distal intake valve 61, the distal intake pipe 6 and the measuring cavity 9 are divided and closed. The contrast collection pipe 7 is arranged on the right outer wall of the monitoring box 4. The contrast collection pipe 7 is communicated with the contrast cavity 91. The contrast collection pipe 7 is an inclined pipe. The height of the connection between the contrast collection pipe 7 and the monitoring box 4 is higher than that of the inlet of the contrast collection pipe 7. The contrast collection pipe 7 is provided with contrast intake fan 72. The contrast intake fan 72 collects the free gas in the granary. The contrast collection valve 71 is arranged at the connection between the contrast collection pipe 7 and the contrast cavity 91. The contrast collection valve 71 is used to close the contrast cavity 91.The discharge system includes a discharge pipe 8 and a discharge valve 81. The top end of the discharge pipe 8 is connected to the measuring chamber 9. The discharge valve 81 is installed inside the discharge pipe 8 to control the discharge state inside the measuring chamber 9.

[0046] like Figures 6 to 9 As shown, the external monitoring unit includes a track frame 1, a moving module, and a monitoring module. The track frame 1 is located on the upper part of the grain silo body 3, and is arranged in a ring around the top of the outer circumference of the silo body 3. The moving module includes a guide frame 13, guide wheels 14, and stabilizing rollers 15. The guide frame 13 is U-shaped, and guide wheels 14 are respectively sleeved at the upper and lower ends of the guide frame 13. The two guide wheels 14 are respectively engaged with the top and bottom surfaces of the track frame 1. The guide wheels 14 are DC driven. A longitudinal extension support is provided at the rear of the guide frame 13, and a spherical stabilizing roller 15 is provided on the side wall of the longitudinal extension support. The spherical stabilizing roller 15 contacts the track frame 1 to stabilize the running direction of the moving module. The monitoring module includes a monitoring platform 12. An infrared radar 2 and a temperature sensor 21 are mounted on the top of the monitoring platform 12. The infrared radar 2 has upper and lower scanning surfaces to monitor the infrared status of the outer top wall and the outer side walls of the chamber 3, respectively. The temperature sensor 21 is located on both sides of the monitoring platform 12 and is designed to avoid light, monitoring and recording the air temperature near the monitoring platform 12.

[0047] The external monitoring unit also includes an energy storage module and a communication module. It uses a wide voltage DC power supply of 10-30V, communicates with the internal monitoring unit using a standard communication protocol, and has a waterproof casing to adapt to monitoring in harsh field conditions.

[0048] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects. The scope of the invention is defined by the appended claims, not by the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0049] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A grain silo phosphine leak monitoring device, characterized by: The utility model provides external monitoring unit and internal monitoring unit, internal monitoring unit includes monitoring box (4), spectrum analyzer (41), countermeasure (42), air inlet pipe and discharge system, monitoring box (4) is divided into measuring cavity (9) and contrast cavity (91) by the partition in, measuring cavity (9) is connected proximal end air inlet pipe (5) and distal end air inlet pipe (6), measuring cavity (9) top communicates measuring cavity countermeasure (42), discharge system communicates with measuring cavity (9) bottom, contrast collection pipe (7) oblique communication contrast cavity (91) lower part, measuring cavity (9) and contrast cavity (91) top are provided with spectrum analyzer (41) respectively, external monitoring unit includes track frame (1), mobile module and monitoring module, track frame (1) is set up around the upper part of the warehouse body (3) of granary, mobile module includes guide frame (13), guide wheel (14), the upper and lower ends of guide frame (13) are respectively sleeved with guide wheel (14), two guide wheels (14) are respectively clamped on the top surface and bottom surface of track frame (1), monitoring module includes monitoring platform (12), monitoring platform (12) top is provided with infrared radar (2) and temperature sensor (21), the rear portion of guide frame (13) is provided with longitudinal extension support, the lateral wall of longitudinal extension support is provided with spherical stable gyro wheel (15), spherical stable gyro wheel (15) is in contact with track frame (1), to stabilize the moving direction of mobile module, infrared radar (2) is obliquely provided with upper and lower scanning surfaces, and the infrared state of the top outer wall of warehouse body (3) and the side outer wall of warehouse body (3) is monitored respectively, temperature sensor (21) is provided on both sides of monitoring platform (12) and is light-avoiding, and the air temperature near monitoring platform (12) is monitored and recorded, countermeasure (42) is provided with storage cavity, atomizer and flow control valve, the countermeasure (42) provided at the top of contrast cavity (91) is contrast cavity countermeasure (42), the storage cavity in contrast cavity countermeasure (42) stores potassium permanganate solution, the countermeasure (42) provided at the top of measuring cavity (9) is measuring cavity countermeasure (42), the top of measuring cavity countermeasure (42) is provided with water storage tank, water storage tank is connected with the atomizer of measuring cavity (9) bottom, and atomizer nozzle is located above measuring cavity (9), pressure sensor is fixedly provided in measuring cavity (9) and contrast cavity (91) respectively, proximal end air inlet valve (51) and proximal end air inlet fan (52) are provided in proximal end air inlet pipe (5), distal end air inlet valve (61) and distal end air inlet fan (62) are provided in distal end air inlet pipe (6), distal end air inlet pipe (6) is provided in monitoring box (4) front, the air inlet pipe mouth of distal end air inlet pipe (6) is connected with hose, and the hose mouth is arranged in the bottom of granary,The far end air inlet valve (61) is arranged at the rear of the far end air inlet fan (62), the far end air inlet valve (61) is an electromagnetic valve, the contrast collection pipe (7) is arranged at the right outer wall of the monitoring box (4), the contrast collection pipe (7) is communicated with the contrast cavity (91), the height of the connection between the contrast collection pipe (7) and the monitoring box (4) is higher than that of the inlet of the contrast collection pipe (7), the contrast collection pipe (7) is provided with a contrast air inlet fan (72), the connection between the contrast collection pipe (7) and the contrast cavity (91) is provided with a contrast collection valve (71), the discharge system comprises a discharge pipe (8) and a discharge valve (81), the top end of the discharge pipe (8) is communicated with the measuring cavity (9), and the discharge pipe (8) is provided with the discharge valve (81).

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