A pretreatment box for a VOCs waste gas continuous monitoring system

Abstract

A pretreatment box for a VOCs waste gas continuous monitoring system includes a box body and a box door, and is characterized in that: a cast aluminum heating plate is fixed on the rear plate in the box body, a first filter, a first regulating valve, a humidity measuring instrument, a second filter, and an air control valve are arranged in the box body, a high-temperature vacuum pump is arranged on the top surface of the box body, one end of the air inlet of the first filter is led out from the top of the box body and communicated with a heating pipeline arranged on the box body, the two ends of the first regulating valve are respectively connected to the air outlet of the first filter and the air inlet of the humidity measuring instrument through pipelines, the air outlet of the humidity measuring instrument is connected to the air intake of the high-temperature vacuum pump through a pipeline, the exhaust port of the high-temperature vacuum pump is connected to the air inlet of the second filter through a pipeline, the air outlet of the second filter is led out from the bottom of the box body through a pipeline, and the air control valve is connected to the air outlet pipeline of the second filter. The pretreatment box is heated evenly, can effectively remove dust particles in the flue gas, and improve the service life and measurement accuracy of the analyzer.

Description

Technical Field

[0001] The utility model relates to a pretreatment box, in particular to a pretreatment box of a VOCs waste gas continuous monitoring system. Background Art

[0002] As people's environmental awareness increases, the requirements for monitoring and controlling VOCs waste gas are becoming higher and higher. As one of the main components of VOCs waste gas, the accurate monitoring of the concentration of non-methane total hydrocarbons is of great significance to environmental protection.

[0003] Existing online monitoring devices generally use a vacuum pump to draw external flue gas into the analyzer of the monitoring system for monitoring. Dust particles and moisture contained in the gas will enter the analyzer of the monitoring system, causing blockage of the analyzer, affecting its monitoring accuracy and service life. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a pretreatment box of a VOCs waste gas continuous monitoring system which has uniform heating, can effectively remove dust particles in the flue gas, and improve the service life and measurement accuracy of the analyzer.

[0005] In order to solve the above problems, the utility model adopts the following technical solutions:

[0006] A pretreatment box for a VOCs waste gas continuous monitoring system comprises a box body with a box door hinged on the front of the box body, and its special features are: a cast aluminum heating plate is fixed on the rear plate inside the box body, a first filter, a first regulating valve, a humidity measuring instrument, a second filter, and an air control valve are arranged in the box body, and a high-temperature vacuum pump is arranged on the top surface of the box body, one end of the air inlet of the first filter is led out from the top of the box body and connected with a heating pipeline arranged on the top of the box body, the two ends of the first regulating valve are respectively connected with the air outlet of the first filter and the air inlet of the humidity measuring instrument through pipelines, the air outlet of the humidity measuring instrument is connected with the air intake of the high-temperature vacuum pump through a pipeline, the exhaust port of the high-temperature vacuum pump is connected with the air inlet of the second filter through a pipeline, the air outlet of the second filter is led out from the bottom of the box body through a pipeline, and the air control valve is connected to the air outlet pipeline of the second filter.

[0007] As a further preference, a tee is connected to the pipeline at one end of the exhaust port of the high-temperature vacuum pump, the air inlet of the second filter is connected to the second port of the tee through the pipeline, the third port of the tee is connected to the second regulating valve through the pipeline, and the other end of the second regulating valve is connected to an exhaust pipe, which is led out from the bottom of the box.

[0008] As a further preference, the filtering accuracy of the first filter is 5 μm, and the filtering accuracy of the second filter is 2 μm.

[0009] As a further preference, the first regulating valve is a manual regulating valve, and the control end is led out from the top surface of the box body.

[0010] As a further preference, the second regulating valve is a manual regulating valve, and the control end is led out from the side of the box.

[0011] As a further preference, the box wall of the box body is a hollow sandwich structure, and aluminum silicate thermal insulation cotton is filled in the hollow sandwich to improve the thermal insulation performance of the box body.

[0012] As a further preference, the air-controlled valve is fixed in the box body through an air-controlled valve bracket, and a PT100 temperature sensor and a temperature control switch are also provided on the air-controlled valve bracket. The PT100 temperature sensor is electrically connected to the signal input end of a PID temperature control meter provided outside the box body, and the cast aluminum heating plate is electrically connected to the PID temperature control meter through the temperature control switch for detecting and controlling the heating temperature in the box body.

[0013] As a further preference, the pipeline is a 316L stainless steel BA pipe to reduce the adsorption of most gases in the flue gas.

[0014] As a further preference, the first filter and the second filter have the same structure and both include a filter base, on which an air inlet and an air outlet are respectively provided in the radial direction and the air inlet joint and the air outlet joint are respectively connected by threads, and at one end of the filter base, a filter element and a filter element jacket are respectively connected by threads and are nested with each other, the air inlet is connected to the annular cavity between the filter element and the filter element jacket through three through holes provided on the filter base, and the air outlet is connected to the filter element through a center hole provided on the filter base.

[0015] The beneficial effects of the utility model are:

[0016] 1. By fixing the cast aluminum heating plate on the rear plate inside the box to cover the entire box, the box can be heated evenly, which can avoid the phenomenon of alternating hot and cold in the exhaust gas due to problems with heating uniformity and heating efficiency, and prevent the effective components in the exhaust gas to be tested from being analyzed, resulting in inaccurate monitoring data.

[0017] 2. The first filter and the second filter in the box can effectively remove dust particles in the flue gas, ensuring that the exhaust gas entering the analyzer is free of impurities such as particulate matter, thereby improving the service life and measurement accuracy of the analyzer.

[0018] 3. The humidity in the flue gas can be measured by a humidity measuring instrument installed in the box, and transmitted to the industrial computer of the VOCs waste gas continuous monitoring system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model after the box door is opened.

[0020] Figure 2 This is a three-dimensional structural diagram of the utility model without the heating pipeline

[0021] Figure 3 The utility model is a circuit control block diagram of the cast aluminum heating plate.

[0022] Figure 4 This is a schematic diagram of the installation of the first filter.

[0023] Figure 5 yes Figure 4 AA section view.

[0024] Figure 6 yes Figure 4 BB cross-sectional view.

[0025] In the figure: box door 1, box body 2, cast aluminum heating plate 3, heating pipeline 4, first filter 5, first regulating valve 6, humidity measuring instrument 7, high-temperature vacuum pump 8, pipeline 9, tee 10, second regulating valve 11, exhaust pipe 12, second filter 13, temperature control switch 14, temperature sensor 15, air control valve 16, air control valve bracket 17, filter bracket 18. DETAILED DESCRIPTION

[0026] like Figure 1-Figure 3 As shown, the utility model relates to a pretreatment box of a VOCs waste gas continuous monitoring system, including a box body 2 with a rectangular shape, a box door 1 hinged in front of the box body 2, the box wall of the box body 2 is a hollow sandwich structure with a thickness of 40 mm, and aluminum silicate insulation cotton is filled in the hollow sandwich to improve the thermal insulation performance of the box body 2.

[0027] A cast aluminum heating plate 3 is fixed to the rear plate in the box body 2 by bolts. The length of the cast aluminum heating plate 3 is slightly smaller than the length of the rear plate in the box body 2. A first filter 5, a first regulating valve 6, a humidity measuring instrument 7, a second filter 13, and an air control valve 16 are arranged in the box body 2. The first filter 5 and the second filter 13 are respectively fixed to the left side and the bottom of the box body 2 by filter brackets 18. The humidity measuring instrument 7 adopts a CI-PC18-H flue gas humidity meter.

[0028] A high-temperature vacuum pump 8 is fixed on the top surface of the box body 2, one end of the air inlet of the first filter 5 is led out from the top of the box body 2 through a pipeline and connected to the heating pipeline 4 fixed on the box body 2 through a heating pipe clamp, the two ends of the first regulating valve 6 are respectively connected to the air outlet of the first filter 5 and the air inlet of the humidity measuring instrument 7 through a pipeline 9, the air outlet of the humidity measuring instrument 7 is connected to the air intake of the high-temperature vacuum pump 8 through the pipeline 9, the exhaust port of the high-temperature vacuum pump 8 is connected to the air inlet of the second filter 13 through the pipeline 9, the air outlet of the second filter 13 is led out from the bottom of the box body 2 through the pipeline 9 and connected to the heating pipeline fixed on the bottom surface of the box body 2, and the air control valve 16 is connected to the air outlet pipeline of the second filter 13.

[0029] A tee 10 is connected to the pipeline at one end of the exhaust port of the high-temperature vacuum pump 8, the air inlet of the second filter 13 is connected to the second port of the tee 10 through a pipeline, the third port of the tee 10 is connected to the second regulating valve 11 through a pipeline, and the other end of the second regulating valve 11 is connected to an exhaust pipe 12, which is led out from the bottom of the box body 2.

[0030] The filter element filtration accuracy of the first filter 5 is 5 μm, and the filter element filtration accuracy of the second filter 13 is 2 μm. The first regulating valve 6 and the second regulating valve 11 are both manual regulating valves, and the control ends are respectively led out from the top surface and the right side surface of the box body 2. The pipeline 9 is a 316L stainless steel BA pipe to reduce the adsorption of most gases in the flue gas.

[0031] The air-controlled valve 16 is fixed to the bottom of the box body 2 by screws through an air-controlled valve bracket 17. A PT100 temperature sensor 15 and a normally closed temperature control switch 14 are also fixed to the air-controlled valve bracket 17 by screws. The PT100 temperature sensor 15 is electrically connected to the signal input end of the PID temperature control meter arranged outside the box body 2. The cast aluminum heating plate 3 is electrically connected to the PID temperature control meter through the temperature control switch 14, so as to detect and control the heating temperature in the box body 2.

[0032] like Figure 4-Figure 6 As shown, the first filter 5 and the second filter 13 have the same structure and both include a filter base 501. The filter base 501 is provided with an air inlet and an air outlet in the radial direction and are respectively connected to an air inlet joint 502 and an air outlet joint 503 by threads. A filter element 504 and a filter element jacket 505 are respectively connected to each other by threads at one end of the filter base 501. The air inlet is connected to the annular cavity between the filter element and the filter element jacket through three through holes 506 provided on the filter base 501, and the air outlet is connected to the filter element 504 through a center hole provided on the filter base 501.

[0033] When in use, the control end of the air control valve 16 is connected to the air compressor through the air circuit, and the upper and lower limits of the heating temperature of the cast aluminum heating plate 3 are set through the PID temperature control table. The opening temperature of the temperature control switch is set to be greater than the upper limit of the heating temperature of the cast aluminum heating plate 3 to prevent the PID temperature control table from malfunctioning and causing the temperature of the cast aluminum heating plate 3 to continue to rise uncontrollably. Manually adjust the opening size of the first regulating valve 6 and the second regulating valve. The opening size of the second regulating valve determines the size of the exhaust volume, so as to facilitate matching and adapting to analyzers from different manufacturers.

[0034] When working, the high-temperature vacuum pump 8 is started to suck the flue gas into the first filter 5 in the box 2 through the heating pipeline. After filtering out some impurities and particles through the first filter 5, the flue gas enters the humidity measuring instrument 7 through the pipeline and the first regulating valve 6. The humidity in the flue gas is measured by the humidity measuring instrument 7 and transmitted to the industrial computer of the VOCs waste gas continuous monitoring system. After the flue gas passing through the humidity measuring instrument 7 is sucked by the high-temperature vacuum pump 8, it is discharged from the exhaust port of the high-temperature vacuum pump 8. Part of the flue gas is discharged through the three-way, the second regulating valve and the exhaust pipe, and the other part of the flue gas enters the second filter 13 through the three-way, and after filtering out some impurities and particles again, it enters the analyzer of the monitoring system through the gas control valve 16 and the heating pipeline.

[0035] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A pretreatment box for a VOCs waste gas continuous monitoring system, comprising a box body, a door hinged in front of the box body, and characterized by: A cast aluminum heating plate is fixed on the rear plate in the box, a first filter, a first regulating valve, a humidity measuring instrument, a second filter, and an air control valve are arranged in the box, and a high-temperature vacuum pump is arranged on the top surface of the box. One end of the air inlet of the first filter is led out from the top of the box and connected with the heating pipeline arranged on the top of the box. The two ends of the first regulating valve are connected with the air outlet of the first filter and the air inlet of the humidity measuring instrument through pipelines respectively, the air outlet of the humidity measuring instrument is connected with the air intake of the high-temperature vacuum pump through a pipeline, the exhaust port of the high-temperature vacuum pump is connected with the air inlet of the second filter through a pipeline, the air outlet of the second filter is led out from the bottom of the box through a pipeline, and the air control valve is connected to the air outlet pipeline of the second filter.

2. The pretreatment box of the VOCs waste gas continuous monitoring system according to claim 1 is characterized by: A tee is connected to the pipeline at one end of the exhaust port of the high-temperature vacuum pump, the air inlet of the second filter is connected to the second port of the tee through a pipeline, the third port of the tee is connected to the second regulating valve through a pipeline, and the other end of the second regulating valve is connected to an exhaust pipe, which is led out from the bottom of the box.

3. The pretreatment box of a VOCs waste gas continuous monitoring system according to claim 1 or 2 is characterized in that: The filtering accuracy of the first filter is 5 μm, and the filtering accuracy of the second filter is 2 μm.

4. The pretreatment box of the VOCs waste gas continuous monitoring system according to claim 1 is characterized by: The first regulating valve is a manual regulating valve, and the control end is led out from the top surface of the box body.

5. The pretreatment box of the VOCs waste gas continuous monitoring system according to claim 2 is characterized by: The second regulating valve is a manual regulating valve, and the control end is led out from the side of the box body.

6. The pretreatment box of the VOCs waste gas continuous monitoring system according to claim 1 is characterized by: The box wall of the box body is a hollow sandwich structure, and aluminum silicate thermal insulation cotton is filled in the hollow sandwich to improve the thermal insulation performance of the box body.

7. The pretreatment box of the VOCs waste gas continuous monitoring system according to claim 1 is characterized by: The air-controlled valve is fixed in the box body through an air-controlled valve bracket. A PT100 temperature sensor and a temperature control switch are also provided on the air-controlled valve bracket. The PT100 temperature sensor is electrically connected to the signal input end of a PID temperature control meter provided outside the box body. The cast aluminum heating plate is electrically connected to the PID temperature control meter through the temperature control switch for detecting and controlling the heating temperature in the box body.

8. The pretreatment box of a VOCs waste gas continuous monitoring system according to claim 1 or 2, characterized in that: The pipeline is a 316L stainless steel BA pipe to reduce the adsorption of most gases in the flue gas.

9. The pretreatment box of the VOCs waste gas continuous monitoring system according to claim 3 is characterized by: The first filter and the second filter have the same structure and both include a filter base. An air inlet and an air outlet are respectively provided on the filter base in a radial direction and are respectively connected to the air inlet joint and the air outlet joint by threads. A filter element and a filter element jacket are respectively connected to each other by threads at one end of the filter base. The air inlet is connected to the annular cavity between the filter element and the filter element jacket through three through holes provided on the filter base, and the air outlet is connected to the filter element through a center hole provided on the filter base.

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