CN212568647U - High-temperature pretreatment device for volatile organic compounds in pollution source - Google Patents
High-temperature pretreatment device for volatile organic compounds in pollution source Download PDFInfo
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- CN212568647U CN212568647U CN202020998622.9U CN202020998622U CN212568647U CN 212568647 U CN212568647 U CN 212568647U CN 202020998622 U CN202020998622 U CN 202020998622U CN 212568647 U CN212568647 U CN 212568647U
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Abstract
The utility model relates to a pollution sources volatile organic compounds high temperature preprocessing device, including the box with be used for producing the high temperature sampling pump of negative pressure, be equipped with appearance gas inlet, appearance gas outlet, bypass export, first high temperature sampling pump connector and second high temperature sampling pump connector on the box, the input port and the first high temperature sampling pump connector of high temperature sampling pump link to each other, and the delivery outlet and the second high temperature sampling pump of high temperature sampling pump link to each other, be equipped with the preliminary treatment gas circuit in the box. The utility model has the advantages that: the process of collecting, preprocessing and outputting the sample gas to the pollution source detection instrument is kept at high temperature, so that the sample gas is kept at high temperature in the whole process, the phenomenon that water vapor generated by temperature difference changes enters the analyzer to interfere with a test result and influence the stability and repeatability of the test is effectively prevented, and the accuracy of the test result is improved. The bypass outlet is arranged, so that the sample gas in the pretreatment device is always kept as the real-time sample gas when the pollution source detection instrument detects the pollution source, and the purpose of real-time monitoring is achieved.
Description
Technical Field
The utility model relates to a pollution detection field especially relates to a high temperature pretreatment device of pollution source volatile organic compounds.
Background
In recent two years, the national requirements for the discharge of the VOCs are more and more strict, the discharge requirements are more and more low, enterprises are required to establish daily management systems such as operation and maintenance regulations and machine accounts of sound VOCs treatment facilities, VOCs monitoring is carried out by themselves, and monitoring results are timely and actively reported to local environment-friendly administrative departments.
For monitoring low-concentration VOCs, a gas chromatography method is generally adopted. The gas chromatography has high test precision, but the test conditions are easily interfered by condensed water, sample gas pressure and the like.
The invention discloses a sampling preprocessor of a fixed pollution source Volatile Organic Compound (VOCS) online monitoring system, which is named CN108593820A and comprises a rack, wherein a stainless steel heat preservation box is fixedly connected to one side of the bottom of the inner wall of the rack, a heating plate, a first high-temperature metal filter and a second high-temperature metal filter are fixedly connected to the bottom of the inner wall of the stainless steel heat preservation box, a temperature sensor is fixedly connected to the top of the heating plate, a sampling pump and a dehumidifier are fixedly connected to the bottom of the inner wall of the rack, a rotor flow meter is fixedly connected to the side face of the rack, a throttle valve is communicated between a first exhaust tee joint and a second exhaust tee joint through a copper pipe, and an internal standard electromagnetic valve and an external standard electromagnetic valve are fixedly connected to two sides of the side face of the rack. The sampling preprocessor of the fixed pollution source Volatile Organic Compound (VOCS) online monitoring system improves the average fault-free running time of the whole system and the system measurement response time, and greatly improves the stability and reliability of the system. The method has the disadvantages that only the sample gas in the heat preservation box is subjected to high-temperature treatment, the sample gas outside the heat preservation box is not subjected to corresponding heating or heat preservation treatment, and the sample gas outside the heat preservation box can generate condensed water to influence subsequent detection.
Disclosure of Invention
The utility model discloses mainly solve the sample gas transportation in-process and produce the temperature and float, appear the comdenstion water easily and lead to the test result to produce the skew and sample gas advances a kind problem that pressure shakiness can influence the test result, provide one kind to sample gas adopt the negative pressure advance kind and can carry out whole journey heat preservation to sample gas and avoid producing condensate water pollution source volatile organic compounds high temperature preprocessing device.
The utility model provides a technical scheme that its technical problem adopted is, a pollution source volatile organic compounds high temperature preprocessing device locates between exhaust emission and the pollution source detecting instrument, including the box and be used for producing the high temperature sampling pump of negative pressure, be equipped with appearance gas inlet, appearance gas outlet, bypass export, first high temperature sampling pump connector and second high temperature sampling pump connector on the box, the input port and the first high temperature sampling pump connector of high temperature sampling pump link to each other, and the delivery outlet and the second high temperature sampling pump of high temperature sampling pump link to each other, be equipped with the preliminary treatment gas circuit in the box.
The high-temperature sampling pump generates negative pressure to sample the sample gas, so that the sample gas is prevented from generating larger pressure and pressure fluctuation instantly.
As an preferred scheme of above-mentioned scheme, the preliminary treatment gas circuit includes first filter, pneumatic valve, high temperature sampling pump, wet oxygen sensor, flowmeter, second filter, the first filter input port links to each other with the entry of appearance gas, and the first filter export links to each other with the first end of pneumatic valve, and the pneumatic valve second end links to each other with high temperature sampling pump input port, and the export of high temperature sampling pump links to each other with the first end of wet oxygen sensor, and wet oxygen sensor second end links to each other with the first end of flowmeter, and the flowmeter second end links to each other with the second filter input port, and the second filter export links to each other with the export of appearance gas. The pretreatment gas circuit carries out secondary filtration on the sample gas to filter out impurities in the sample gas, and carries out wet oxygen detection on the sample gas.
As an optimal scheme of the scheme, a three-way valve is arranged between the wet oxygen sensor and the flowmeter, a first end of the three-way valve is connected with the wet oxygen sensor, a second end of the three-way valve is connected with the flowmeter, and a third end of the three-way valve is connected with a bypass outlet through a needle valve. The three-way valve and the needle valve are arranged, so that sample gas can be discharged from a bypass outlet when the pollution source detection instrument detects, and the sample gas in the box body is guaranteed to be real-time sample gas.
As a preferable scheme of the scheme, a heating plate, a temperature sensor and a temperature controller are further arranged in the box body, and the heating plate and the temperature sensor are both connected with the temperature controller. The temperature in the box body is controlled, and condensed water generated by the sample gas is avoided.
As a preferred scheme of the scheme, the device further comprises a first heat tracing pipe, wherein one end of the first heat tracing pipe is arranged at the waste gas discharge port, and the other end of the first heat tracing pipe is connected with the sample gas inlet. And the condensed water is not generated in the transmission process of the sample gas from the waste gas discharge port to the sample gas inlet.
As a preferred scheme of the scheme, the device further comprises a second heat tracing pipe, wherein one end of the second heat tracing pipe is arranged on the sample gas outlet and connected, and the other end of the second heat tracing pipe is connected with the pollution source detection instrument. And the condensed water is not generated in the transmission process of the sample gas from the sample gas outlet to the pollution source detection instrument.
As a preferable mode of the above aspect, the box body is an incubator.
As an optimal scheme of the scheme, a calibration three-way valve is arranged between the pneumatic valve and the high-temperature sampling pump, the first end of the calibration three-way valve is connected with the pneumatic valve, the second end of the calibration three-way valve is connected with the high-temperature sampling pump, the third end of the calibration three-way valve is connected with the first end of the calibration electromagnetic valve, and the second end of the calibration electromagnetic valve is connected with outside air. And external air enters the wet oxygen sensor through the calibration solenoid valve to automatically calibrate the wet oxygen sensor.
As a preferred scheme of the above scheme, a calibration three-way valve is arranged between the flow meter and the second filter, a first end of the calibration three-way valve is connected with the flow meter, a second end of the calibration three-way valve is connected with the second filter, a third end of the calibration three-way valve is respectively connected with a first end of a standard gas solenoid valve and a first end of a zero gas solenoid valve, a second end of the standard gas solenoid valve is connected with a standard gas, and a second end of the zero gas solenoid valve is connected with a zero gas phase. And standard gas and zero gas enter the device through a standard gas electromagnetic valve and a zero gas electromagnetic valve respectively to perform cabinet calibration and whole-course calibration.
The utility model has the advantages that: the process of collecting, preprocessing and outputting the sample gas to the pollution source detection instrument is kept at high temperature, so that the sample gas is kept at high temperature in the whole process, the phenomenon that water vapor generated by temperature difference changes enters the analyzer to interfere with a test result and influence the stability and repeatability of the test is effectively prevented, and the accuracy of the test result is improved. The bypass outlet is arranged, so that the sample gas in the pretreatment device is always kept as the real-time sample gas when the pollution source detection instrument detects the pollution source, and the purpose of real-time monitoring is achieved.
Drawings
Fig. 1 is a schematic view of a gas path structure of a high-temperature pretreatment device for volatile organic compounds in a pollution source in an embodiment.
FIG. 2 is a schematic structural diagram of an exemplary high-temperature pretreatment apparatus for volatile organic compounds of a pollution source.
1-sample gas inlet 2, first filter 3, pneumatic valve 4, high temperature sampling pump 5, wet oxygen sensor 6, flowmeter 7, second filter 8, needle valve 9, bypass valve 10, driving gas valve 11, bypass outlet 12, sample gas outlet 13, second heat tracing pipe 14 and heating plate.
Detailed Description
The technical solution of the present invention is further described below by way of examples and with reference to the accompanying drawings.
Example 1:
the high-temperature pretreatment device for the volatile organic compounds in the pollution source comprises a box body 15, a high-temperature sampling pump 4, a first heat tracing pipe and a second heat tracing pipe 13, wherein the box body is an insulation box made of aluminum alloy, an interlayer is arranged in the side wall and the upper wall and the lower wall of the box body, ceramic fiber heat insulation material is arranged in the interlayer, a sample gas inlet 1, a sample gas outlet 12, a bypass outlet 11, a first high-temperature sampling pump connecting port and a second high-temperature sampling pump connecting port are formed in the box body, the sample gas inlet 1 is connected with a first end of the first heat tracing pipe, a second end of the first heat tracing pipe is arranged at an industrial waste gas discharge port, a sampling probe is further arranged at the second end of the first heat tracing pipe, waste gas enters the first heat tracing pipe through the sampling probe, a filter is arranged in the sampling probe to primarily filter impurities in the waste gas, and the sampling probe is further connected with a, the back flushing box provides back flushing air flow, the back flushing air flow blows gas in the sampling probe to an industrial waste gas discharge port to remove impurities on a filter screen of the filter, the sample gas outlet is connected with the first end of the second heat tracing pipe 13, the second end of the second heat tracing pipe 13 is connected with the detection instrument, the bypass outlet is sequentially connected with the needle valve 8 and the bypass valve 9, the needle valve is used for adjusting the air displacement, and the bypass valve is connected with the tail gas main pipe and is used for controlling whether waste is discharged into the tail gas main pipe or not. The first high-temperature sampling pump connecting port and the second high-temperature sampling pump connecting port are respectively connected with the input end and the output end of the high-temperature sampling pump.
Be equipped with the preliminary treatment gas circuit in the box, the preliminary treatment gas circuit includes first filter 2, pneumatic valve 3, high temperature sampling pump 4, wet oxygen sensor 5, flowmeter 6, second filter 7, first filter input port links to each other with the appearance gas entry, first filter export links to each other with the first end of pneumatic valve, pneumatic valve second end links to each other with high temperature sampling pump input port, high temperature sampling pump output port links to each other with the first end of wet oxygen sensor, wet oxygen sensor second end links to each other with the first end of flowmeter, flowmeter second end links to each other with the second filter entry, the second filter export links to each other with the appearance gas export, pneumatic valve control end links to each other with drive valve 10, compressed air carries pneumatic valve control end to control the pneumatic valve through driving valve. When the high-temperature sampling pump operates, negative pressure is formed in the pretreatment gas path, so that the gas pressure at the inlet of the sample gas is lower than the gas pressure at the discharge port of the industrial waste, the sample gas is pressed into the pretreatment gas path under the action of the gas pressure, and the sample gas has stable flow velocity and can not fluctuate greatly when entering the pretreatment gas path by adopting negative pressure gas inlet. Be equipped with the three-way valve between wet oxygen sensor and flowmeter, the first end of three-way valve links to each other with wet oxygen sensor, and the three-way valve second end links to each other with the flowmeter, and the three-way valve third end links to each other with the bypass outlet. When the detection instrument analyzes the sample gas, the second end of the three-way valve is closed, the sample gas can only flow between the first end and the third end, and the sample gas is discharged into the tail gas main pipe after passing through the three-way valve, the bypass outlet, the needle valve and the bypass valve, so that the sample gas is prevented from being retained in the pretreatment gas circuit, the sample gas used by the detection instrument during the next analysis is the real-time sample gas instead of the sample gas during the previous analysis, and the real-time detection is realized.
Still be equipped with the hot plate on the inside bottom surface of box, what correspond still is equipped with temperature sensor and temperature controller, and temperature controller controls the box internal temperature through temperature sensor and hot plate, makes the appearance gas in the preliminary treatment gas circuit keep high temperature, avoids the comdenstion water to appear. Except that the box heats the sample gas, first heat tracing pipe and second heat tracing pipe also can heat the sample gas, avoid the sample gas to produce the comdenstion water in transportation process. The temperature of the first heat tracing pipe, the second heat tracing pipe and the box body is kept at 120 ℃ or above 20 ℃ higher than the temperature in the industrial waste discharge port.
Example 2:
this embodiment compares with embodiment 1, and its difference lies in, is equipped with the calibration three-way valve between pneumatic valve and high temperature sampling pump, and the first end of calibration three-way valve links to each other with the pneumatic valve, and calibration three-way valve second end links to each other with high temperature sampling pump, and calibration three-way valve third end links to each other with the first end of calibration solenoid valve, and calibration solenoid valve second end links to each other with the outside air, and the outside air enters into the wet oxygen sensor through the calibration solenoid valve and carries out automatic calibration to the wet oxygen sensor. Be equipped with between flowmeter and the second filter and mark the three-way valve, mark the first end of three-way valve and link to each other with the flowmeter, mark the three-way valve second end and link to each other with the second filter, mark three-way valve third end and link to each other with mark first end of gas solenoid valve and zero gas solenoid valve first end respectively, mark gas solenoid valve second end and mark the gas and link to each other, zero gas solenoid valve second end links to each other with zero gas phase. And standard gas and zero gas enter the device through a standard gas electromagnetic valve and a zero gas electromagnetic valve respectively to perform cabinet calibration and whole-course calibration.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (9)
1. The utility model provides a pollution sources volatile organic compounds high temperature preprocessing device locates between exhaust emission and pollution sources detecting instrument, characterized by: including box (15) and high temperature sampling pump (4) that are used for producing the negative pressure, be equipped with sample gas entry (1), sample gas export (12), bypass export (11), first high temperature sampling pump connector and second high temperature sampling pump connector on the box, the input port of high temperature sampling pump links to each other with first high temperature sampling pump connector, and the delivery outlet of high temperature sampling pump links to each other with second high temperature sampling pump, be equipped with the preliminary treatment gas circuit in the box.
2. The high-temperature pretreatment device for the volatile organic compounds of the pollution source according to claim 1, which is characterized in that: the pretreatment gas circuit includes first filter (2), pneumatic valve (3), high temperature sampling pump (4), wet oxygen sensor (5), flowmeter (6), second filter (7), the first filter input port links to each other with the entry of appearance gas, and the first filter export links to each other with the first end of pneumatic valve, and the pneumatic valve second end links to each other with high temperature sampling pump input port, and high temperature sampling pump output links to each other with the first end of wet oxygen sensor, and wet oxygen sensor second end links to each other with the first end of flowmeter, and the flowmeter second end links to each other with the second filter input port, and the second filter export links to each other with the export of appearance gas.
3. The high-temperature pretreatment device for the volatile organic compounds of the pollution source according to claim 2, which is characterized in that: be equipped with the three-way valve between wet oxygen sensor and the flowmeter, the first end of three-way valve links to each other with wet oxygen sensor, and the three-way valve second end links to each other with the flowmeter, and the three-way valve third end links to each other with the bypass export, is equipped with needle valve (8) on the bypass export.
4. The high-temperature pretreatment device for the volatile organic compounds of the pollution source according to claim 1, which is characterized in that: still be equipped with hot plate (14), temperature sensor and temperature controller in the box, hot plate and temperature sensor all link to each other with temperature controller.
5. The high-temperature pretreatment device for the volatile organic compounds of the pollution source according to claim 1, which is characterized in that: still include first heat tracing pipe, exhaust port is located to first heat tracing pipe one end, and the other end links to each other with the sample gas entry.
6. The high-temperature pretreatment device for the volatile organic compounds of the pollution source according to claim 1, which is characterized in that: still include second heat tracing pipe (13), sample gas outlet is located to second heat tracing pipe one end and links to each other, and other end pollution sources instrumentation links to each other.
7. The high-temperature pretreatment device for the volatile organic compounds of the pollution source according to claim 1, which is characterized in that: the box body is an insulation box.
8. The high-temperature pretreatment device for the volatile organic compounds of the pollution source according to claim 2, which is characterized in that: be equipped with the calibration three-way valve between pneumatic valve and the high temperature sampling pump, calibration three-way valve first end links to each other with the pneumatic valve, and calibration three-way valve second end links to each other with the high temperature sampling pump, and calibration three-way valve third end links to each other with the first end of calibration solenoid valve, and calibration solenoid valve second end links to each other with the outside air.
9. The high-temperature pretreatment device for the volatile organic compounds of the pollution source according to claim 2, which is characterized in that: the calibration three-way valve is arranged between the flowmeter and the second filter, a first end of the calibration three-way valve is connected with the flowmeter, a second end of the calibration three-way valve is connected with the second filter, a third end of the calibration three-way valve is connected with a first end of the standard gas electromagnetic valve and a first end of the zero gas electromagnetic valve respectively, a second end of the standard gas electromagnetic valve is connected with the standard gas, and a second end of the zero gas electromagnetic valve is connected with the zero gas phase.
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| CN202020998622.9U CN212568647U (en) | 2020-06-03 | 2020-06-03 | High-temperature pretreatment device for volatile organic compounds in pollution source |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112946205A (en) * | 2021-04-27 | 2021-06-11 | 南京呈禾信息科技有限公司 | Portable low-adsorption high-temperature pretreatment device |
| CN114594216A (en) * | 2022-03-30 | 2022-06-07 | 南京分析仪器厂有限公司 | Method for monitoring flare waste gas emission |
-
2020
- 2020-06-03 CN CN202020998622.9U patent/CN212568647U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112946205A (en) * | 2021-04-27 | 2021-06-11 | 南京呈禾信息科技有限公司 | Portable low-adsorption high-temperature pretreatment device |
| CN114594216A (en) * | 2022-03-30 | 2022-06-07 | 南京分析仪器厂有限公司 | Method for monitoring flare waste gas emission |
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