CN212483471U

CN212483471U - High-temperature separation detection double-valve box

Info

Publication number: CN212483471U
Application number: CN202020992935.3U
Authority: CN
Inventors: 张凯; 王增辉
Original assignee: Hangzhou Ruixiao Automation Instrument Co ltd
Current assignee: Hangzhou Ruixiao Automation Instrument Co ltd
Priority date: 2020-06-03
Filing date: 2020-06-03
Publication date: 2021-02-05
Anticipated expiration: 2030-06-03

Abstract

The utility model discloses a high temperature separation detects double-valve case, overcomes the big problem of prior art's measuring result deviation, including the box, set up total hydrocarbon post and the appearance gas inlet outside the box inside the box, characterized by, still include the thermal insulation board that sets up in the box, the thermal insulation board divides single-valve case into two, one is for installing chromatographic column case, and the other is the valve case and installs analysis gas circuit part; a methane column and a column box PTC heating plate are also arranged in the chromatographic column mounting box, and a total hydrocarbon column is also arranged in the chromatographic column mounting box; the valve box installation analysis gas circuit part is internally provided with a filter, an electromagnetic valve, a temperature measuring probe, a FID detector, a valve box PTC heating sheet, a six-way valve, a ten-way valve and a micro-current amplifier, wherein the six-way valve is connected with the ten-way valve. The utility model discloses a to the reasonable setting that carries on of analysis gas circuit, the peak detection appears in time of successively staggering, consequently as long as adopt single detector can accomplish two component detections, and can not interfere with each other.

Description

High-temperature separation detection double-valve box

Technical Field

The utility model belongs to the technical field of the exhaust-gas detection technique and specifically relates to a little high temperature separation of simple and convenient error of measurement process detects double-valve box is related to.

Background

In China, VOCs volatile organic compounds refer to organic compounds with the saturated vapor pressure of more than 70.91 Pa at normal temperature, the boiling point of below 50-260 ℃ at the standard atmospheric pressure of 101.3kPa and the initial boiling point of 250 ℃, or any organic solid or liquid capable of volatilizing at normal temperature and normal pressure. When the concentration of volatile organic compounds in indoor air is too high, acute poisoning is easily caused, mild people can have headache, dizziness, cough, nausea, vomiting or a drunk shape, serious people can have hepatotoxicity and even coma quickly, and some people may have life risks. The flow of the VOCs overall-process solution comprises VOCs pollution emission link investigation, VOCs monitoring system and total amount estimation, overall-process VOCs treatment scheme compilation, production process source control measures, customized terminal VOCs treatment technical scheme, treatment effect evaluation and emission reduction evaluation. Wherein, the pollution link investigation and the whole process carding control are the key points for the VOCs remediation of the industrial enterprises. The pollution links such as storage tanks, loading and unloading materials, equipment leakage, process waste gas, unorganized emission, a waste water collecting and treating system, cooling water, combustion waste gas, accident emission and the like are investigated one by one, the whole-process carding work of VOCs from the source to the tail end is developed, and the VOCs pollution is controlled in the whole process.

The waste gas of the VOCs fixed pollution source is usually discharged at high temperature, the whole-course high temperature is needed for detecting the waste gas, the detecting instrument is used for ensuring the real accuracy of detection, and meanwhile, the detecting process is needed to be carried out at high temperature for ensuring that the detecting gas does not form condensation in the instrument. Realized through the heat preservation gas circuit case of non-methane detector.

The prior technical scheme of the incubator of the non-methane total hydrocarbon detector adopts single-valve measurement to cause incomplete separation of a methane peak and an oxygen peak, so that deviation occurs in detection of methane components, peak detection cannot be carried out in time staggered, and the methane peak and the oxygen peak of a measurement result interfere with each other.

Disclosure of Invention

The utility model relates to an overcome the big problem of prior art's measuring result deviation, provide a high temperature separation and detect bivalve case, through the reasonable setting of carrying on to the analysis gas circuit, make the total hydrocarbon peak that gets into the FID detector and the retention time of methane peak different, the peak detection of appearing in the time of successively staggering avoids measuring result to disturb each other.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a high-temperature separation detection double-valve box comprises a box body, a total hydrocarbon column arranged in the box body, a sample gas inlet arranged on the outer side of the box body and a heat insulation plate arranged in the box body, wherein the heat insulation plate divides a single-valve box into two parts, one part is used for installing a chromatographic column box, and the other part is used for installing an analysis gas circuit part on the valve box; a methane column and a column box PTC heating plate are also arranged in the chromatographic column mounting box, and a total hydrocarbon column is also arranged in the chromatographic column mounting box; the valve box installation analysis gas circuit part is internally provided with a filter, an electromagnetic valve, a temperature measuring probe, a FID detector, a valve box PTC heating sheet, a six-way valve, a ten-way valve and a micro-current amplifier, wherein the six-way valve is connected with the ten-way valve, and the ten-way valve is provided with a 0.25ml quantitative pipe and a 1ml quantitative pipe.

Through the reasonable setting of carrying out on the analysis gas circuit, make the retention time of total hydrocarbon peak and the methane peak that gets into the FID detector different, the time-out peak detection in time of succeeding and wrong, consequently as long as adopt single detector can accomplish two component detections, and can not interfere with each other, according to the integral value of peak shape, by data processing circuit calculation measuring result: and subtracting the methane measured value from the total hydrocarbon measured value to obtain a non-methane total hydrocarbon measured value.

Preferably, the air passage inside the box body is connected as follows: the sample gas inlet is connected with a six-way valve, a ten-way valve and a bypass outlet through electromagnetic valves, the six-way valve is connected with a FID detector, and a 1ml quantitative tube is connected with a pre-separation column after the addition.

Preferably, the double valve box is made of aluminum alloy.

Preferably, the thickness of the ceramic fiber thermal insulation material is 2 cm.

Preferably, the valve box PTC heater chip and the column box PTC heater chip are 220V heater chips.

Preferably, the temperature measuring probe adopts a small pt100 platinum resistor and is controlled by PID parameter calculation.

Preferably, the temperature control precision of the temperature measuring probe is 0.1 ℃.

Preferably, the single valve box further comprises an intermediate interlayer, the intermediate interlayer is arranged in the single valve box, and the ceramic fiber thermal insulation material is lined in the intermediate interlayer.

Therefore, the utility model discloses following beneficial effect has:

1. the sample gas to be measured is usually high-temperature, and a high-temperature resistant electromagnetic valve is adopted to ensure that the sample gas is high-temperature in the whole process and has no cold spot

2. The concentration of sample gas discharged from a fixed pollution source changes rapidly, partial instruments adopt the first sample gas to detect Total Hydrocarbon (THC), then sample gas is taken again to detect methane (CH 4), and then the value (NMHC) of non-methane total hydrocarbon is obtained through calculation, so that the deviation between the measured value and the actual value is possible, and the gas circuit in the box body adopts the double quantitative pipes for sampling in series, so that the sample gas in the quantitative pipes is ensured to be in the same time to the maximum extent, and the accuracy of measurement is ensured;

3. the PTC heating inside the heat preservation box has the characteristics of high heat efficiency, long service life, safety and the like, and the double temperature zones are independently controlled, so that the heat preservation box is suitable for different use scenes;

4. through the reasonable setting of carrying out on the analysis gas circuit, make the retention time of total hydrocarbon peak and the methane peak that gets into the FID detector different, the time-out peak detection in time of succeeding and wrong, consequently as long as adopt single detector can accomplish two component detections, and can not interfere with each other, according to the integral value of peak shape, by data processing circuit calculation measuring result: and subtracting the methane measured value from the total hydrocarbon measured value to obtain a non-methane total hydrocarbon measured value.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a block diagram of the standby sampling control of the present invention.

Fig. 3 is a control block diagram of the atmospheric pressure balance of the present invention.

Fig. 4 is a control block diagram of the detection process of the present invention.

In the figure: 1. the device comprises a heat insulation plate 2, an installation chromatographic column box 3, a valve box installation analysis gas circuit part 4, a total hydrocarbon column 5, a methane column 6, a column box PTC heating sheet 7, a filter 8, an electromagnetic valve 9, a temperature measuring probe 10, a FID detector 11, a valve box PTC heating sheet 12, a six-way valve 13, a micro-current amplifier 14 and a ten-way valve.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description.

In the embodiment shown in fig. 1, a high-temperature separation detection double-valve box is made of aluminum alloy, a ceramic fiber thermal insulation material is lined in an intermediate interlayer, the thickness of the double-valve box is 2cm, the double-valve box comprises a box body, a total hydrocarbon column 4 arranged in the box body and a sample gas inlet arranged on the outer side of the box body, a thermal insulation plate 1 is arranged in the box body, the thermal insulation plate 1 divides the single-valve box into two parts, one part is used for installing a chromatographic column box 2, and the other part is used for installing an analysis gas circuit part 3; a methane column 5, a pre-separation column and a column box PTC heating plate 6 are also arranged in the chromatographic column box 2, and a total hydrocarbon column 4 is also arranged in the chromatographic column box 2; the valve box installation analysis gas circuit part 3 is internally provided with a filter 7, an electromagnetic valve 8, a temperature measuring probe 9, an FID detector 10, a valve box PTC heating sheet 11, a six-way valve 12, a ten-way valve 14 and a micro-current amplifier 13, wherein the six-way valve is connected with the ten-way valve, and the ten-way valve is provided with a 0.25ml quantitative pipe and a 1ml quantitative pipe.

The analysis gas circuit adopts double quantitative pipes connected in series, and a double-column parallel back-flushing technology is used for analyzing non-methane total hydrocarbons, so that peak broadening is reduced, and the analysis time is shortened.

The utility model discloses the working process is as follows: as shown in fig. 2-4, the high temperature sample gas to be measured enters the analysis gas circuit through the sample gas inlet, and simultaneously the 0.25ml dosing tube and the 1ml dosing tube are washed, and the sample gas is fully replaced to fill the dosing tubes; when the instrument starts to measure, the sample gas is guided to a bypass outlet by the sample introduction electromagnetic valve, the sample gas in the quantitative tube is balanced with the atmosphere, and one path of 0.25ml of sample gas of the quantitative tube directly enters the FID detector after entering a stainless steel hollow column to measure the concentration value of the total hydrocarbon; the other 1ml of gas sample of the quantitative tube enters a separation chromatographic column through a six-way valve, methane is separated in the chromatographic column, firstly flows out of the chromatographic column, and enters an FID detector for detection, so that a methane concentration measurement value is obtained; and after the methane is discharged, switching and restoring the sampling valve, carrying out back flushing on the gas circuit, and carrying out back flushing on all the residual non-methane total hydrocarbons in the column. Through the reasonable setting of the analysis gas circuit, the retention time of the total hydrocarbon peak and the methane peak entering the FID detector is different, and peak detection is carried out in time staggered, so that two component detection can be completed by only adopting a single detector without mutual interference. From the integrated value of the peak shape, the measurement result is calculated by the data processing circuit: and subtracting the methane measured value from the total hydrocarbon measured value to obtain a non-methane total hydrocarbon measured value.

The staged gas circuit flow is as follows: sampling (standby) → atmospheric equilibrium → detection → back flushing → sampling (standby)

Sampling (standby): the gas to be measured enters the instrument from the positive pressure of the sample gas inlet, enters the No. 1 hole of the ten-way valve through the sample injection electromagnetic valve, enters the 1ml quantitative ring and the 0.25ml quantitative ring through the internal communication channel of the ten-way valve, and is finally discharged from the No. 2 hole of the ten-way valve for continuous sampling.

Atmospheric balance: when the sample gas enters the balance flow, the state of the sample introduction electromagnetic valve is changed, so that the sample gas enters from the sample gas inlet, the bypass outlet is discharged, the sample gas outlet of the instrument is communicated with the atmosphere, and the sample gas in the quantitative ring is subjected to atmosphere balance.

And (3) detection: when the atmospheric balance process is finished, the states of the ten-way valve and the six-way valve are changed simultaneously, carrier gas is divided by the two three-way valves, the first path of carrier gas enters from the No. 4 hole of the ten-way valve and enters the 0.25ml quantitative ring through the internal communication channel of the ten-way valve, sample gas in the 0.25ml quantitative ring is taken out from the No. 5 hole of the ten-way valve, and the total hydrocarbon is detected firstly because the gas resistance of the total hydrocarbon column is small when the total hydrocarbon column is used for detection. And the second path of carrier gas enters from the No. 9 hole of the ten-way valve and enters the 1ml quantitative ring through the internal communication channel of the ten-way valve, the sample gas in the 1ml quantitative ring is brought out to the No. 2 hole of the six-way valve from the No. 8 hole of the ten-way valve, the sample gas is brought to the methane column from the No. 1 hole of the six-way valve through the internal communication channel of the six-way valve, the methane firstly flows out of the methane column and enters the No. 3 hole of the six-way valve, and the methane firstly flows out of the No. 4 hole of the six. The 3 rd path of carrier gas enters from the No. 5 hole of the six-way valve, and the No. 6 hole flows to the bypass outlet, and the path of carrier gas is used as balance gas.

And after changing and changing the states of the ten-way valve and the six-way valve for 2 seconds, the sample electromagnetic valve is restored to the initial state, the sample gas enters from the sample gas inlet and passes through the channel of the No. 2 hole of the ten-way valve, and the sample gas is discharged from the sample gas outlet.

Back flushing: and when the methane detection is finished, the ten-way valve and the six-way valve are restored to the initial state, the first path of carrier gas directly flows to the FID through the total hydrocarbon column without passing through a 0.25ml quantitative ring, the second path of carrier gas changes the direction of entering the methane column, and the non-methane total hydrocarbons which do not flow out of the column at the moment are reversely blown to the bypass outlet. The third carrier gas now enters the FID as the balance gas. And simultaneously, the two quantitative tubes start to be washed and sample introduced to prepare for the next detection.

And (4) completely discharging non-methane total hydrocarbon components in the methane column from the sample gas bypass, and enabling the instrument to enter a standby state.

The above embodiments are only used for further explanation of the present invention, and it is not understood that the present invention is limited by the protection scope of the present invention, and the technical engineers in the field are right according to the above contents of the present invention.

Claims

1. A high-temperature separation detection double-valve box comprises a box body, a total hydrocarbon column arranged in the box body and a sample gas inlet arranged outside the box body, and is characterized by further comprising a heat insulation plate arranged in the box body, wherein the heat insulation plate divides the single-valve box into two parts, one part is used for installing a chromatographic column box, and the other part is used for installing an analysis gas circuit part in the valve box; a methane column and a column box PTC heating plate are also arranged in the chromatographic column mounting box, and a total hydrocarbon column is also arranged in the chromatographic column mounting box; the valve box installation analysis gas circuit part is internally provided with a filter, an electromagnetic valve, a temperature measuring probe, a FID detector, a valve box PTC heating sheet, a six-way valve, a ten-way valve and a micro-current amplifier, wherein the six-way valve is connected with the ten-way valve, and the ten-way valve is provided with a 0.25ml quantitative pipe and a 1ml quantitative pipe.

2. The high-temperature separation detection double-valve box as claimed in claim 1, wherein the air path inside the box body is connected as follows: the sample gas inlet is connected with a six-way valve, a ten-way valve and a bypass outlet through electromagnetic valves, the six-way valve is connected with a FID detector, and a 1ml quantitative tube is connected with a pre-separation column after the addition.

3. The high-temperature separation detection double-valve box as claimed in claim 1, wherein the double-valve box is made of aluminum alloy.

4. The high temperature separation test double valve box according to claim 1, wherein the valve box PTC heater chip and the column box PTC heater chip are 220V heater chips.

5. The high-temperature separation detection double-valve box as claimed in claim 1, wherein the temperature measuring probe adopts a small pt100 platinum resistor and is controlled by PID parameter operation.

6. The high-temperature separation and detection double-valve box as claimed in claim 5, wherein the temperature control precision of the temperature measuring probe is 0.1 ℃.

7. The high-temperature separation and detection double-valve box according to any one of claims 1 to 6, characterized by further comprising an intermediate interlayer, wherein the intermediate interlayer is arranged in the single-valve box, and ceramic fiber thermal insulation materials are lined in the intermediate interlayer.

8. The high-temperature separation detection double-valve box as claimed in claim 7, wherein the thickness of the ceramic fiber thermal insulation material is 2 cm.