TWI477777B - Positive pressure can control the temperature and humidity of the gas supply device - Google Patents

Description

Positive pressure control gas supply device capable of controlling temperature and humidity

The invention relates to a positive pressure controllable temperature and humidity gas supply device, in particular to a constant temperature and humidity standard gas to an analyzer for use as a calibration.

Air pollution sampling, analysis and monitoring can understand the types and concentrations of pollutants in the air. It is the ear of the air quality management system. Through this work, engineers, scientists, decision makers and planners can understand the pollutants at specific times and places. The concentration and use of this information to make a correct judgment, develop a management strategy or conduct pollution source emission control to maintain air quality.

Air pollutant measurement usually involves two tasks: sampling and analysis. The so-called sampling is to collect samples of airborne pollutants at the site at that time. The analysis uses chemical or gravimetric methods to determine the concentration of pollutants. The sampling must be on site. The analysis is usually carried out in the laboratory, but it can also be analyzed on site.

As shown in Fig. 1, before the laboratory analysis, in order to prevent the sensing element of the analyzer from being passivated or contaminated, it is necessary to perform a correction process in advance, including using the flow controller 12 and the flow meter 13 to make the standard gas 10 and The zero-value standard gas 11 is mixed in proportion in the mixing tank 14, and is input to the analyzer 16 through the output manifold 15 to perform the operation of the parameter correction 17.

Different measurement objects have great differences in their surrounding environment (such as temperature, humidity, etc.) and contaminant concentrations, so the sampling and analysis methods are also different. Since the detection value of pollution has a great relationship with the temperature, humidity, and pressure of the detection environment, the detection value according to the normal detection method tends to deviate from the fact. In view of this, it is necessary to be able to control the temperature and humidity of the standard gas source in order to truly improve the accuracy of the instrument calibration.

The currently available constant temperature and humidity chambers are mainly designed for testing high temperature, low temperature resistance and humidity resistance of electronic products. It is known from the design common sense that the design is different for different purposes, and small differences may damage the composition of standard gases. Therefore, it is not possible to directly apply the commercially available constant temperature and humidity chamber directly to the laboratory for heating and humidifying the standard gas and maintaining the constant temperature and humidity.

In view of the need to improve the accuracy of the calibration analyzer, the present invention provides a positive pressure controllable temperature and humidity gas supply device, which basically has a gas-liquid mixing humidification device, a programmable constant temperature and humidity control box and a flow control unit. The gas-liquid mixing and humidifying device is a closed container, and an air inlet pipe is provided to be introduced into the distilled water contained therein for introducing a high-pressure standard gas into the distilled water to be humidified and then exited by an air outlet pipe. A humidified standard gas; the programmable constant temperature and humidity control box provides a constant temperature and humidity water vapor mixed with the standard gas subjected to the first humidification treatment to become a standard gas of constant temperature and humidity. The flow control unit is in communication with the programmable constant temperature and humidity control box to control the flow of the constant temperature and humidity standard gas flow to an analyzer for use as a calibration analyzer.

2‧‧‧Gas supply device capable of controlling temperature and humidity

10‧‧‧ standard gas

11‧‧‧zero standard gas

12‧‧‧Flow Controller

13‧‧‧ Flowmeter

14‧‧‧ mixing tank

15‧‧‧ Output manifold

16‧‧‧Analyzer

17‧‧‧Parameter correction

21‧‧‧Gas-liquid mixing and humidifying device

22‧‧‧High pressure standard gas

23‧‧‧Standard gas after the first humidification

24‧‧‧ coil

25‧‧‧Programmable constant temperature and humidity control box

26‧‧‧Standard gas with constant temperature and humidity

27‧‧‧Flow Control Unit

28‧‧‧Analyzer

30‧‧‧ thermometer

31‧‧‧Hygrometer

210‧‧‧Intake pipe

211‧‧‧ distilled water

212‧‧‧Exhaust pipe

251‧‧‧Sloping partition

252‧‧‧Upper space

253‧‧‧Lower space

254‧‧‧Circular fan

255‧‧‧ distilled water

256‧‧‧Constant water and humidity

257‧‧‧heater

258‧‧‧temperature controller

259‧‧‧Proportional-Integral-Derivative Controller

271‧‧‧Flow adjustment device

272‧‧‧ flowmeter

273‧‧‧directional valve

2511‧‧‧ openings

2521‧‧‧ Pressure relief device

2531‧‧‧Level switch

2532‧‧‧Automatic water control valve

Fig. 1 is a flow chart for correcting the conventional contaminated gas analyzer.

Fig. 2 is a schematic view showing a gas supply device capable of controlling temperature and humidity according to the positive pressure of the present invention.

As shown in FIG. 2, the positive pressure controllable temperature and humidity gas supply device 2 according to the present invention is provided with a gas-liquid mixing and humidifying device 21, a programmable constant temperature and humidity control box 25 and a flow control unit. 27.

The gas-liquid mixing and humidifying device 21 is a closed container, which can be made of glass or any material that does not chemically react with the calibration gas, and is provided with an air inlet pipe 210 and is installed inside. The distilled water 211 is used to introduce a high pressure standard gas 22 into the distilled water 211 for humidification, and then exits through an outlet pipe 212 to become a standard gas 23 subjected to the first humidification treatment.

In order to pre-adjust the temperature at which the high-pressure standard gas 22 enters the gas-liquid mixing and humidifying device 21, it may be first absorbed or released by a coil 24, and then enters the gas-liquid mixing and humidifying device 21 from the intake pipe 210. The humidification is performed so that the distilled water 211 in the gas-liquid mixing and humidifying device 21 is frozen when the temperature is too low, or the distilled water 211 is boiled when the temperature is too high.

The programmable constant temperature and humidity control box 25 provides a constant temperature and humidity water vapor 256 mixed with the standard humidification standard gas 23 to become a constant temperature and humidity standard gas 26. The flow control unit 27 is in communication with the programmable constant temperature and humidity control box 25 for controlling the constant temperature and humidity standard gas 26 to flow to an analyzer 28 for use in calibrating the analyzer 28.

The programmable constant temperature and humidity control box 25 of the present embodiment is provided with an inclined partition 251 for dividing the interior into an upper space 252 and a lower space 253, wherein the inclined partition 251 is provided with a circulation fan 254. The bottom of the lower space 253 is filled with distilled water 255 of a certain liquid level, and a heater 257 is immersed in distilled water 255. The heater 257 is controlled by a temperature controller 258 to heat the distilled water 255 to produce a water vapor 256 in the lower space 253. The standard humidification gas 23 subjected to the first humidification treatment is mixed with the water vapor 256 via the pipeline input to the lower space 253, and is sent to the upper space 252 via the circulation fan 254, and is sufficiently mixed with the water vapor 256 in the upper space 252.

The temperature controller 258 applied in this embodiment may include a proportional-integral-derivative controller 259 (PID); in addition, a thermometer 30 and a hygrometer 31 should be provided in the upper space 252 to detect water vapor 256. And a temperature value and a humidity value after the first humidification standard gas 23 is mixed, and the temperature value and the humidity value are transmitted to the proportional-integral-derivative controller 259, thereby adjusting the heater 257, so that The constant temperature and humidity standard gas 26 of the upper space 252 reaches a set temperature and humidity and is stably maintained.

In order to avoid the stable control of the temperature and humidity caused by the water in the upper space 252, at the lower end of the inclined partition 251, at least one opening 2511 may be provided to condense the supersaturated water vapor 256 in the upper space. At 252, the lower space 253 is allowed to drip from the opening 2511 to reheat or replenish the distilled water 255.

Preferably, a pressure relief device 2521 can be provided in the upper space 252 to automatically open when the space pressure exceeds a certain value to prevent the pressure in the programmable constant temperature and humidity control box 25 from being excessive. In addition, a lower level switch 253 and an automatic water supply control valve 2532 may be provided in the lower space 253 to maintain the water level of the distilled water 255 and automatically replenish the distilled water 255.

In summary, the positive pressure control gas and temperature control gas supply device of the present invention can provide the constant temperature and humidity standard gas 26 of the detection instrument, and the programmable constant temperature and humidity control box 25 is used for separating and applying. The proportional-integral-differential controller 259 makes the temperature and humidity precise and simple, and has practical, novel and progressive patent requirements for the familiarity test operator.

2‧‧‧Gas supply device capable of controlling temperature and humidity

21‧‧‧Gas-liquid mixing and humidifying device

22‧‧‧High pressure standard gas

23‧‧‧Standard gas after the first humidification

24‧‧‧ coil

25‧‧‧Programmable constant temperature and humidity control box

26‧‧‧Standard gas with constant temperature and humidity

27‧‧‧Flow Control Unit

28‧‧‧Analyzer

30‧‧‧ thermometer

31‧‧‧Hygrometer

210‧‧‧Intake pipe

211‧‧‧ distilled water

212‧‧‧Exhaust pipe

251‧‧‧Sloping partition

252‧‧‧Upper space

253‧‧‧Lower space

254‧‧‧Circular fan

255‧‧‧ distilled water

256‧‧‧Constant water and humidity

257‧‧‧heater

258‧‧‧temperature controller

259‧‧‧Proportional-Integral-Derivative Controller

271‧‧‧Flow adjustment device

272‧‧‧ flowmeter

273‧‧‧directional valve

2511‧‧‧ openings

2521‧‧‧ Pressure relief device

2531‧‧‧Level switch

2532‧‧‧Automatic water control valve

Claims (10)

The utility model relates to a gas supply device capable of controlling temperature and humidity with positive pressure, comprising: a gas-liquid mixing humidification device, which is a closed container, and an intake pipe is connected to the interior to hold a distilled water for introducing a high-pressure standard gas. The high-pressure standard gas is first introduced into the distilled water and then exited by an outlet pipe, thereby becoming a standard gas subjected to the first humidification treatment; a programmable constant temperature and humidity control box is introduced into the outlet pipe to introduce the passage The first humidified standard gas provides a constant temperature and humidity water vapor mixed with the first humidification standard gas to make a constant temperature and humidity standard gas; and a flow control unit, and The programmable constant temperature and humidity control box is connected to control the constant temperature and humidity standard gas flow to an analyzer for correcting the analyzer. The positive pressure controllable temperature and humidity gas supply device according to the first aspect of the invention, wherein the programmable constant temperature and humidity control box is provided with a sloping partition to divide the interior into an upper space and a lower space, The feature is that the inclined partition is provided with a circulation fan. The positive pressure controllable temperature and humidity gas supply device according to claim 2, wherein the lower space is filled with a distilled water, a heater and a temperature controller, and the heater is controlled by the temperature controller. The distilled water is heated to produce a water vapor. The positive pressure controllable temperature and humidity gas supply device according to claim 3, wherein the water vapor and the first humidification-treated standard gas system are sent to the upper space via the circulation fan, and In the upper space, the two are thoroughly mixed. The positive pressure controllable temperature and humidity gas supply device according to claim 4, wherein the temperature controller comprises a proportional-integral-derivative controller (PID); a thermometer and a hygrometer are disposed thereon a space for detecting a temperature value and a humidity value of the water vapor and the standard gas after the first humidification treatment, and controlling the heater according to the temperature value and the humidity value to make the space The standard gas reaches and maintains the temperature and humidity set by an operator. A gas supply device capable of controlling temperature and humidity according to positive pressure according to item 3 of the patent application, The inclined partition plate is provided with at least one opening, so that the water vapor is dripped back to the lower space to reheat when the upper space is condensed. The gas supply device capable of controlling temperature and humidity according to the third aspect of the patent application, wherein the upper space is provided with a pressure release device, and when the standard gas pressure of the constant temperature and humidity exceeds a certain value, the gas is automatically opened to Prevent excessive pressure in the programmable constant temperature and humidity control box. The positive pressure controllable temperature and humidity gas supply device according to claim 3, wherein the lower space is provided with a liquid level switch and an automatic water supply control valve to maintain the water level of the distilled water and automatically replenish the distilled water. The positive pressure controllable temperature and humidity gas supply device according to claim 3, wherein the high pressure standard gas system enters the intake pipe of the gas-liquid mixing and humidifying device via a coil. The positive pressure controllable temperature and humidity gas supply device according to claim 1, wherein the flow control unit comprises a flow rate adjusting device, a flow meter and a directional valve to form an outlet passage.