CN111487355A - A wall-mounted constant temperature control box with calibration function - Google Patents

Abstract

The invention relates to a wall-mounted constant temperature control box with a calibration function, which comprises a calibration system and a mixing system, wherein the calibration system is connected with a chromatograph through the mixing system; the mixing system of the invention fundamentally mixes the liquid nitrogen and the sample gas into the self-circulation mixing pipeline mechanism, the liquid nitrogen and the sample gas are fully mixed along with the heating gasification release, the self-circulation mixing pipeline mechanism utilizes the combination of the arc section and the horn section to promote the mutual flow of the internal gas by utilizing the gasification of the liquid nitrogen, so that the sample gas and the nitrogen generated by the gasification of the liquid nitrogen are fully mixed, especially the organic phase in the sample gas is well released into the atmosphere of the nitrogen in the process of low-temperature rise, the mixed gas after the mixing treatment can reduce the fluctuation of the detection value of a chromatograph, the detection data is more credible, and the data processing is easier.

Description

A wall-mounted constant temperature control box with calibration function

technical field

The invention belongs to the technical field of gas online monitoring, in particular to a wall-mounted constant temperature control box with a calibration function.

Background technique

Volatile Organic Compounds (VolatileOrganicCompounds), referred to as VOC. At present, the VOC online monitoring system is an integrated system that provides gas monitoring services for the environmental monitoring industry, which can realize online monitoring of the main components and total amount of organic waste gas. The online monitor adopts advanced component analysis algorithm and FID technology, collects, processes, analyzes, stores and uploads real-time measurement data through high-precision AD sampling, and monitors total VOC concentration, main component concentration, and total emissions in real time. quantity.

The gas online monitoring equipment generally needs to be equipped with a constant temperature control box. The constant temperature control box is a standard pretreatment equipment. Its main function is to maintain the temperature stability of the gas entering the VOC online monitoring equipment and avoid the sample gas temperature being too high or too low. The internal detection unit of the VOC online monitoring equipment causes damage. The problem of the constant temperature control box in the prior art is that the mixing of the standard gas and the sample gas is not sufficient when entering the VOC online monitoring equipment. Therefore, when the mixed gas passes through the detection unit, its composition It is in a fluctuating state, causing the detection data to fluctuate, requiring multiple algorithm processing to obtain credible data.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a wall-mounted constant temperature control box with calibration function, which can evenly mix the calibration gas and the sample gas in order to solve the above problems.

The present invention realizes above-mentioned purpose through following technical scheme:

A wall-mounted constant temperature control box with calibration function, including a calibration system and a mixing system, the calibration system includes an air pump, a six-way valve and a quantitative loop, the inlet of the air pump is connected to the sample gas inlet through a pipeline, and the outlet is connected to the six The port 5 of the one-way valve and the port 6 of the six-way valve are connected to the whole calibration outlet through the pipeline. A quantitative loop is connected between the port 4 and port 1 of the six-way valve, and the port 2 of the six-way valve is connected to the mixing system. Inlet, the No. 3 port of the six-way valve is connected to the standard gas inlet through a pipeline; the mixing system includes No. 1 three-way valve, a self-circulating mixing pipeline mechanism, a heating unit, an air inlet, an air outlet, an air inlet valve and an air outlet valve, self-circulating The mixing pipeline mechanism is a symmetrical structure, including an upper unit and a lower unit. The upper unit and the lower unit both include an arc section, a connecting section, a horn section, a connecting section and a middle passing section, and the two ends of the arc section are respectively connected by the connecting section. The wide end of one horn section, the constricted sections of the two horn sections are directly connected through the connecting section, the middle of the connecting section is connected to one end of the middle section, the other end of the middle section is connected to the middle of the arc section, the upper unit and the lower The arc segments of the unit are connected as a whole to form a conjoined part. The two sides of the conjoined part are respectively connected with an air inlet nozzle and an air outlet nozzle. Inlet valve, there is an outlet valve on the air outlet pipe, the inlet nozzle is connected to the lower port of the No. 1 three-way valve, the left port of the No. 1 three-way valve is connected to the outlet of the calibration system, and the right port of the No. 1 three-way valve is connected to the carrier gas The inlet and the gas outlet are connected to the sample gas inlet of the chromatograph; the arc section is provided with a heating unit.

As a further optimized solution of the present invention, the standard gas is liquid nitrogen.

As a further optimized solution of the present invention, the inner spaces of the arc segments of the upper unit and the lower unit communicate with each other.

As a further optimized solution of the present invention, the heating unit is an electric heating wire, and the electric heating wire surrounds the outside of the arc-shaped section.

As a further optimized solution of the present invention, the chromatograph adopts the gas chromatograph in the prior art. The detection return port of the chromatograph is connected to the inlet of the water-gas separator through a pipeline, and the water outlet of the water-gas separator is connected to the waste water collection pipeline. The detection return port discharges the detected waste gas, the gas phase of the waste gas after water and gas separation is discharged into the atmosphere from the gas outlet, and the water outlet is discharged into the waste water collection pipeline for collection.

As a further optimized solution of the present invention, the calibration system is also connected to a backflushing system, and the backflushing system is used to backflush the pipelines of the calibration system. The backflushing system includes a compressed air source, a solenoid valve and a No. 2 three-way valve. The compressed air The source is connected to the upper port of the No. 2 three-way valve through a pipeline and a solenoid valve, and the left and right ports of the No. 2 three-way valve are respectively connected to the sample gas inlet and the suction pump inlet. The No. 2 three-way valve switches the compressed air and the sample gas into the suction pump. When the left port is switched to connect with the right port, the sample gas enters the suction pump. When the upper port is switched to connect with the right port, the compressed air enters the suction pump. Pipes are backflushed.

The beneficial effects of the present invention are:

1) The mixing system of the present invention basically mixes liquid nitrogen and sample gas into the self-circulating mixing pipeline mechanism, and is released with heating and gasification, so that the liquid nitrogen and the sample gas are fully mixed, and the self-circulating mixing pipeline mechanism uses an arc section. And the combination of the horn section uses liquid nitrogen gasification to promote the mutual flow of the internal gas, so that the sample gas and the nitrogen gas generated by the liquid nitrogen gasification are fully mixed, especially the organic phase in the sample gas is well released from the low temperature heating process to the nitrogen gas. In the atmosphere, the mixed gas after such a mixed treatment can reduce the fluctuation of the detection value of the chromatograph, make the detection data more reliable, and the data processing is easier;

2) The present invention adopts the structure of a six-way valve and a quantitative loop to calibrate the sample gas, and can conveniently switch to the standard gas channel, and the standard gas can be better mixed with the sample gas.

Description of drawings

1 is a schematic diagram of the system structure of the present invention in Embodiment 1;

Fig. 2 is the valve port schematic diagram of the six-way valve when the quantitative loop of the present invention intercepts the sample gas in the first embodiment;

Fig. 3 is the valve port schematic diagram of the six-way valve when the standard gas of the present invention is mixed with the sample gas in the first embodiment;

4 is a schematic structural diagram of the self-circulating mixing pipeline mechanism of the present invention in the first embodiment.

In the figure: air pump 101, six-way valve 102, quantitative loop 103;

No. 1 three-way valve 201, self-circulating mixing pipeline mechanism 202, heating unit 203, air inlet nozzle 204, air outlet nozzle 205, air inlet valve 206, air outlet valve 207;

Arc segment 2021, connecting segment 2022, horn segment 2023, connecting segment 2024, middle passage segment 2025, and connecting part 2026;

Solenoid valve 301, No. 2 three-way valve 302.

Detailed ways

The application will be described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific embodiments are only used to further illustrate the application, and should not be construed as limiting the protection scope of the application. Those skilled in the art can The above application content makes some non-essential improvements and adjustments to this application.

Example 1

As shown in Figure 1-4, a wall-mounted constant temperature control box with calibration function includes a calibration system and a mixing system. The calibration system is connected to the chromatograph through the mixing system. The calibration system calibrates the sample gas and obtains the calibration quantity. The sample gas is initially mixed with the standard gas in the calibration system, and then enters the mixing system to be fully mixed with the standard gas, and then is sent to the chromatograph through the carrier gas to monitor the sample gas.

The calibration system includes an air pump 101, a six-way valve 102 and a quantitative loop 103. The inlet of the air pump 101 is connected to the sample gas inlet through a pipeline, and the outlet is connected to the No. 5 port of the six-way valve 102 through a pipeline, and the No. 6 port of the six-way valve 102 passes through The pipeline is connected to the entire calibration outlet, a quantitative loop 103 is connected between the No. 4 port and the No. 1 port of the six-way valve 102, the No. 2 port of the six-way valve 102 is connected to the inlet of the mixing system, and the No. 3 port of the six-way valve 102 passes through the pipeline Connect the calibration gas inlet.

The method of sample gas calibration of the calibration system: the valve port of the six-way valve 102 is switched to the port 2 and port 3, the port 1 is connected with the port 6, the port 5 is connected with the port 4, and the air pump 101 Suction into port 6, the sample gas passes through port 6, port 1, loop 103, port 4 and port 5 in sequence, the quantitative sample gas is intercepted by loop 103, and the remaining sample gas is discharged from the whole calibration outlet;

The method of mixing the sample gas and the standard gas of the calibration system: the valve port of the six-way valve 102 is switched to the No. 2 port and the No. 1 port, the No. 3 port is connected with the No. 4 port, and the No. 5 port is connected with the No. 6 port, and the standard gas enters No. 3, pass through No. 3, No. 4, quantitative loop 103, No. 1 and No. 2 in sequence, when the standard gas passes through the quantitative loop 103, it is mixed with the quantitative sample gas retained in the quantitative loop 103 and finally from 2. The number port is output to the mixing system.

The mixing system includes a No. 1 three-way valve 201, a self-circulating mixing pipeline mechanism 202, a heating unit 203, an air inlet nozzle 204, an air outlet nozzle 205, an air inlet valve 206 and an air outlet valve 207. The self-circulating mixing pipeline mechanism 202 is a symmetrical structure, including The upper unit and the lower unit include an arc section 2021, a communication section 2022, a horn section 2023, a connection section 2024 and a middle pass section 2025, and the two ends of the arc section 2021 are connected by the communication section 2022 respectively. The wide end of the horn section 2023, the constricted sections of the two horn sections 2023 are directly connected through the connecting section 2024, the middle of the connecting section 2024 is connected to one end of the middle section 2025, and the other end of the middle section 2025 is connected to the arc section 2021. In the middle, the arc segments 2021 of the upper unit and the lower unit are connected together to form a conjoined part 2026. The two sides of the conjoined part 2026 are respectively connected to the air inlet 204 and the air outlet 205. The air outlet 205 and the air inlet 204 are connected to the arc. The inner space of the shape segment 2021 is connected, the intake nozzle 204 is provided with an intake valve 206, the air outlet pipe is provided with an air outlet valve 207, the intake nozzle 204 is connected to the lower port of the No. 1 three-way valve 201, and the No. 1 three-way valve 201 The left port of No. 1 is connected to the No. 2 port of the six-way valve 102, the right port of the No. 1 three-way valve 201 is connected to the carrier gas inlet, and the gas outlet 205 is connected to the sample gas inlet of the chromatograph; the arc section 2021 is provided with a heating unit 203.

If necessary, the standard gas is liquid nitrogen. The carrier gas is nitrogen.

The mixing principle of the mixing system: First, the No. 1 three-way valve 201 is switched to communicate with the left port and the lower port, and the mixed gas of the standard gas and the sample gas enters the arc section 2021 of the upper unit and the lower unit from the air inlet 204, and then flows from the liquid Nitrogen is vaporized by the heating of the heating unit 203, the vaporization increases the total gas phase, the air pressure inside the arc-shaped section 2021 increases, and the air flow flows through the communication section 2022 to the wide-mouth end of a horn section 2023, and the air flow passes through the wide end of the horn section 2023. The mouth end enters the constricted section. Due to the change of the diameter, a negative pressure is generated in the connecting section 2024 in the middle, and the gas is drawn in from the middle passage section 2025, and then flows out from the other horn section 2023. The kinetic energy of the gas flow is actually caused by the liquid nitrogen gasification. Provided, before the liquid nitrogen is completely vaporized, the internal vaporization will continuously make the internal air flow between the arc section 2021 and the horn section 2023, and produce a good mixing effect in a completely sealed space. The gas inside the self-circulating mixing pipe mechanism 202 can enter a stable state only after the nitrogen is completely vaporized.

After a certain period of time (preferably 30s) in the above-mentioned air intake process, the mixed gas containing the sample gas completely enters the annular pipe. At this time, the valve on the air inlet nozzle 204 is closed, and the valve on the air outlet nozzle 205 is initially closed. The gas is enclosed within the self-circulating mixing conduit mechanism 202 .

After a certain period of time (preferably 1 to 2 minutes), the liquid nitrogen in the mixed gas is fully vaporized. At this time, the gas outlet valve 207 is opened, and the gas is discharged from the gas outlet nozzle 205 due to the high pressure in the self-circulating mixing pipeline mechanism 202 and enters the sample gas inlet of the chromatograph. , online monitoring of volatile organic compounds by chromatograph.

When the chromatograph needs to be cleaned, the No. 1 three-way valve 201 is switched to connect the right port and the lower port, and then the inlet valve 206 and the air outlet valve 207 are opened, and the carrier gas enters the self-circulating mixing pipeline mechanism 202 through the No. 1 three-way valve 201 , and then enter the sample gas inlet of the chromatograph, and clean the chromatograph with pure carrier gas.

In this embodiment, the inner spaces of the arc segments 2021 of the upper unit and the lower unit communicate with each other.

In this embodiment, the heating unit 203 is a heating wire, and the heating wire surrounds the outside of the arc-shaped section 2021 .

In this embodiment, the gas chromatograph in the prior art is used as the chromatograph. The detection return port of the chromatograph is connected to the inlet of the water-gas separator through a pipeline, and the water outlet of the water-gas separator is connected to the waste water collection pipeline. The detection return port discharges the detected waste gas, the gas phase of the waste gas after water and gas separation is discharged into the atmosphere from the gas outlet, and the water outlet is discharged into the waste water collection pipeline for collection.

The calibration system is also connected to the backflushing system, and the backflushing system is used to backflush the pipeline of the calibration system. The backflushing system includes a compressed air source, a solenoid valve 301 and a No. 2 three-way valve 302. The compressed air source is connected to the solenoid valve 301 through a pipeline. The upper port of the No. 2 three-way valve 302, the left port and the right port of the No. 2 three-way valve 302 are connected to the sample gas inlet and the inlet of the air pump 101, respectively. The No. 2 three-way valve 302 switches the compressed air and the sample gas into the suction pump 101. When the left port is switched to be connected to the right port, the sample gas enters the suction pump 101. When the upper port is switched to be connected to the right port, the compressed air enters the suction pump 101. , and backflush the calibration system pipeline.

Necessarily, the same constant temperature control box as in the prior art is provided with a constant temperature system, but it only acts on the section after the gas outlet 205 , that is, only performs constant temperature treatment on the gas discharged from the gas outlet 205 .

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the patent of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention.

Claims (6)

1. The utility model provides a wall-hanging constant temperature control box that contains demarcation function which characterized in that: the calibration system comprises an air extracting pump, a six-way valve and a quantitative ring, wherein an inlet of the air extracting pump is connected with a sample gas inlet through a pipeline, an outlet of the air extracting pump is connected with a No. 5 port of the six-way valve through a pipeline, a No. 6 port of the six-way valve is connected with a full-range calibration outlet through a pipeline, the quantitative ring is connected between a No. 4 port and a No. 1 port of the six-way valve, a No. 2 port of the six-way valve is connected with an inlet of the hybrid system, and a No. 3 port of the six-way; the mixing system comprises a No. 1 three-way valve, a self-circulation mixing pipeline mechanism, a heating unit, an air inlet nozzle, an air outlet nozzle, an air inlet valve and an air outlet valve, wherein the self-circulation mixing pipeline mechanism is of a symmetrical structure and comprises an upper unit and a lower unit, the upper unit and the lower unit respectively comprise an arc section, a communicating section, a horn section, a connecting section and a middle section, two ends of the arc section are respectively connected with wide-mouth ends of the two horn sections through the communicating section, necking sections of the two horn sections are directly connected through the connecting section, the middle part of the connecting section is communicated with one end of the middle section, the other end of the middle section is connected with the middle part of the arc section, the arc sections of the upper unit and the lower unit are connected into a whole to form a connected part, two sides of the connected part are respectively connected with the air inlet nozzle and the air outlet nozzle, the air outlet nozzle and the air inlet nozzle are both communicated with the inner, the left port of the No. 1 three-way valve is connected with the outlet of the calibration system, the right port of the No. 1 three-way valve is connected with the carrier gas inlet, and the gas outlet nozzle is communicated with the sample gas inlet of the chromatograph; the arc-shaped section is provided with a heating unit.

2. The wall-mounted type thermostatic control box with the calibration function according to claim 1, characterized in that: the standard gas is liquid nitrogen.

3. The wall-mounted type thermostatic control box with the calibration function according to claim 1, characterized in that: the inner spaces of the arc sections of the upper unit and the lower unit are communicated with each other.

4. The wall-mounted type thermostatic control box with the calibration function according to claim 1, characterized in that: the heating unit is an electric heating wire which is surrounded outside the arc-shaped section.

5. The wall-mounted type thermostatic control box with the calibration function according to claim 1, characterized in that: and a detection return port of the chromatograph is connected with an inlet of the water-gas separator through a pipeline, and a water outlet of the water-gas separator is connected to a wastewater collection pipeline.

6. The wall-mounted type thermostatic control box with the calibration function according to claim 1, characterized in that: the calibration system is further connected with a back flushing system, the back flushing system is used for back flushing of a pipeline of the calibration system, the back flushing system comprises a compressed air source, an electromagnetic valve and a No. 2 three-way valve, the compressed air source is connected with an upper opening of the No. 2 three-way valve through the pipeline and the electromagnetic valve, and a left opening and a right opening of the No. 2 three-way valve are respectively connected with a sample gas inlet and an air suction pump inlet.

Images