KR20240078180A - Detachable trap apparatus for high speed measurement of ppt-level greenhouse gases - Google Patents

Abstract

A detachable trap device for high-speed measurement of ultra-trace greenhouse gases includes a trap through which gas for measurement of ultra-trace greenhouse gases passes, a heat-conducting insulator that contacts the trap to provide cooling and insulation functions for the trap, and a heat-conducting insulator that provides cooling and insulation functions for the trap through the heat-conducting insulator. It includes a cooler that removes heat, and a temperature control unit that applies current to the trap to heat the trap by Joule heating.

Description

Detachable trap device for high-speed measurement of trace amounts of greenhouse gases {DETACHABLE TRAP APPARATUS FOR HIGH SPEED MEASUREMENT OF PPT-LEVEL GREENHOUSE GASES}

The present invention relates to a detachable trap device for high-speed measurement of trace amounts of greenhouse gases, and more specifically, to a detachable trap device capable of high-speed measurement of trace amounts of greenhouse gases using string heating.

Global warming is the result of increasing concentrations of greenhouse gases in the atmosphere. Greenhouse gases selectively absorb infrared rays and emit them back into the atmosphere, causing global warming. Greenhouse gases include 76% carbon dioxide, 13% methane, 6% nitrogen oxide, and 5% fluorocarbons. Monitoring these greenhouse gases is important for controlling global warming and facilitates the international community's carbon trading power policy.

Trace amounts of greenhouse gases exist in the atmosphere at the ppt (parts per trillion) level. In order to measure trace amounts of greenhouse gases at the ppt level, commercial equipment with a measurement resolution of ppb (parts per billion) level involves concentrating the gas by cooling and heating it as a pretreatment step. For continuous monitoring of trace greenhouse gases, it is necessary to improve the concentration rate by reducing cooling and heating times.

The technical problem to be solved by the present invention is to provide a detachable trap device for high-speed measurement of trace amounts of greenhouse gases that can improve the concentration rate by reducing cooling and heating times for continuous monitoring of trace amounts of greenhouse gases.

A detachable trap device for high-speed measurement of ultra-trace greenhouse gases according to an embodiment of the present invention includes a trap through which gas passes for measurement of ultra-trace greenhouse gases, a heat-conducting insulator that contacts the trap and provides cooling and insulating functions for the trap; It includes a cooler that removes heat from the trap through the heat-conducting insulator, and a temperature control unit that applies current to the trap to heat the trap by Joule heating.

The heat-conducting insulator may be made of aluminum nitride, a ceramic material.

A linear groove is formed in the heat-conducting insulator, and the trap can be attached and detached to the groove of the heat-conducting insulator.

The detachable trap device for high-speed measurement of trace amounts of greenhouse gases forms a double pipe by wrapping a certain portion of the trap that penetrates one wall of the vacuum chamber, and moves the trap so that the trap can be detached from the groove of the heat conduction insulator. Additional bellows may be included to allow this.

The detachable trap device for high-speed measurement of trace amounts of greenhouse gases may further include a heat-conducting substrate positioned between the heat-conducting insulator and the cooler to improve heat conduction efficiency between the heat-conducting insulator and the cooler.

The temperature control unit includes a temperature sensor that measures the temperature of the trap, a power supply with a first electrode connected to one end of the trap to provide current to the trap, and a power supply between the second electrode of the power supply and the other end of the trap. It may include a connected SSR switch, and a controller that controls the on and off times of the SSR switch so that the temperature of the trap becomes the target temperature.

The temperature control unit includes a temperature sensor that measures the temperature of the trap, a controller that generates a control voltage so that the temperature of the trap becomes the target temperature, a silicon controlled rectifier that generates a first voltage corresponding to the control voltage, And it may include a transformer that transforms the first voltage input from the silicon controlled rectifier element into a low voltage second voltage, amplifies the current, and applies it to the trap.

A detachable trap device for high-speed measurement of trace amounts of greenhouse gases according to another embodiment of the present invention includes a trap through which gas passes for measuring trace amounts of greenhouse gases, a temperature sensor that measures the temperature of the trap, and a first electrode at one end of the trap. a power supply connected to the trap to provide current to the trap; an SSR switch connected between the second electrode of the power supply and the other end of the trap; and an SSR switch turned on so that the temperature of the trap becomes the target temperature. It includes a controller that controls time and off time.

A detachable trap device for high-speed measurement of trace amounts of greenhouse gases according to another embodiment of the present invention includes a trap through which gas passes for measuring trace amounts of greenhouse gases, a temperature sensor that measures the temperature of the trap, and a temperature sensor that measures the temperature of the trap, and determines the temperature of the trap to be the target temperature. A controller that generates a control voltage, a silicon controlled rectifier that generates a first voltage corresponding to the control voltage, and a first voltage input from the silicon controlled rectifier is transformed into a low voltage second voltage and a current It includes a transformer that amplifies and applies it to the trap.

A detachable trap device for high-speed measurement of trace amounts of greenhouse gases according to another embodiment of the present invention is a trap in the form of a stainless steel tube through which gas passes for measuring trace amounts of greenhouse gases, and a linear groove through which the trap can be attached and detached is formed. a heat-conducting insulator that provides cooling and insulating functions for the trap, and a portion of the trap that penetrates one wall of the vacuum chamber to form a double pipe, so that the trap can be attached and detached to the groove of the heat-conducting insulator. and a bellows allowing movement of the trap.

The detachable trap device according to an embodiment of the present invention can measure trace amounts of greenhouse gases at high speed using string heating, can secure detachment and detachment function using a bellows, and secures a vacuum level by using a double pipe, and only releases the sample concentration part in the trap. It can be heated efficiently.

Figure 1 shows a detachable trap device for high-speed measurement of extremely trace greenhouse gases according to an embodiment of the present invention.
Figure 2 shows a temperature control unit according to an embodiment of the present invention.
Figure 3 shows the process of controlling the temperature of the trap using the temperature control unit of Figure 2.
Figure 4 shows a temperature control unit according to another embodiment of the present invention.
Figure 5 shows the process of controlling the temperature of the trap using the temperature control unit of Figure 4.
Figure 6 shows the attachment and detachment function of a trap according to another embodiment of the present invention.

Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. The invention may be implemented in many different forms and is not limited to the embodiments described herein.

In order to clearly explain the present invention, parts that are not relevant to the description are omitted, and identical or similar components are given the same reference numerals throughout the specification.

In addition, throughout the specification, when a part is said to "include" a certain component, this means that it may further include other components rather than excluding other components, unless specifically stated to the contrary.

Figure 1 shows a detachable trap device for high-speed measurement of extremely trace greenhouse gases according to an embodiment of the present invention.

Referring to FIG. 1, the detachable trap device 100 according to an embodiment of the present invention may be a device that performs a process of concentrating gas by cooling and heating as a pretreatment step for measuring trace amounts of greenhouse gases.

The detachable trap device 100 may include a trap 110, bellows 115, a heat-conducting insulator 120, a heat-conducting substrate 130, a cooler 140, and a temperature control unit 150. The detachable trap device 100 may be installed inside a vacuum chamber. Figure 1 shows only one side wall 160 of the vacuum chamber, and a trap 110, a bellows 115, a heat conduction insulator 120, and a heat conduction substrate 130 are installed inside the vacuum chamber (top of one side wall 160). ) and a cooler 140 are installed.

The trap 110 may be a stainless steel tube through which gas for measuring trace amounts of greenhouse gas passes through and is concentrated by cooling and heating. The gas inlet and gas outlet of the trap 110 may be located outside the vacuum chamber (at the bottom of one wall 160), and the gas enrichment portion (sample portion) of the trap 110 may be located inside the vacuum chamber. The gas concentration portion (sample portion) may be a portion that is not surrounded by the bellows 115 and is in contact with the heat-conducting insulator 120 in the vacuum chamber.

The bellows 115 may form a double pipe by surrounding a certain portion of the trap 110 that penetrates one wall 160 of the vacuum chamber. The bellows 115 may allow movement (eg, axial movement) of the trap 110 and provide a detachable function for the trap 110. The interior of the bellows 115, that is, between the bellows 115 and the trap 110, may be filled with an insulating material (eg, glasswool, heat shrink tube, Teflon tape, etc.) for insulation. Inside the vacuum chamber, the end of the bellows 115 is welded in contact with the trap 110, and the part where the bellows 115 is in contact with one wall 160 of the vacuum chamber is sealed, thereby ensuring the degree of vacuum in the vacuum chamber. It can be. The bellows 115 is made of an insulating material and can insulate the trap 110 from the vacuum chamber. Alternatively, the portion where the bellows 115 is in contact with one wall surface 160 of the vacuum chamber may be sealed with an insulating material to insulate the trap 110 from the vacuum chamber.

The heat-conducting insulator 120 has high thermal conductivity and high insulation properties, and can provide cooling and insulating functions for the trap 110 by contacting the trap 110. The heat conduction insulator 120 is formed with a linear groove 120G in which the stainless steel tube-shaped trap 110 is seated, and the gas concentration portion (sample portion) of the trap 110 is formed in the groove of the heat conduction insulator 120. It can be attached and detached to (120G). The heat-conducting insulator 120 may be made of aluminum nitride, a ceramic material. Aluminum nitride, a ceramic material, can insulate the trap 110 while securing the cooling rate of the trap 110 with very high thermal conductivity (160 W/mK).

In order to cool the trap 110 in the form of a stainless steel tube to which a high current is applied in a vacuum, heat must be removed through conduction through direct contact. However, if the cooler 140 is brought into contact with the trap 110 without insulation, it may cause electrical leakage. Safety issues such as equipment failure may occur. Teflon tape, high-performance polymer PEEK, anodized aluminum, etc. can be used to insulate the trap 110. However, the thermal conductivity of Teflon tape is 0.3 W/mK, the thermal conductivity of PEEK is 0.25 W/mK, and the thermal conductivity of anodized aluminum is 0.3 W/mK. It is only 30W/mK and the thermal conductivity of copper is less than 1/10 of 400W/mK, so the trap 110 can be cooled quickly. Aluminum nitride, a ceramic material with a thermal conductivity of 160 W/mK, is suitable for rapid cooling and insulation of the trap 110.

The heat conduction substrate 130 may be attached below the heat conduction insulator 120 to improve heat conduction efficiency. That is, the heat-conducting substrate 130 is located between the heat-conducting insulator 120 and the cooler 140 to improve heat conduction efficiency between the heat-conducting insulator 120 and the cooler 140. The heat-conducting substrate 130 may be made of copper, which has a high thermal conductivity of 400 W/mK.

The cooler 140 may be attached below the heat-conducting substrate 130 to cool the heat-conducting substrate 130 and remove heat from the trap 110 through the heat-conducting insulator 120.

In other words, the heat-conducting substrate 130 is placed (in contact with) the cooler 140, the heat-conducting insulator 120 is placed (in contact with) the heat-conducting substrate 130, and the trap 110 is placed on the heat-conducting insulator 120. (contact) can be made. The trap 110 is inserted and mounted into the groove 120G of the heat-conducting insulator 120 and can be insulated from the heat-conducting substrate 130 and the cooler 140 by only contacting the heat-conducting insulator 120, and is a heat-conducting insulator with excellent thermal conductivity. By using (120), it can be cooled quickly.

The temperature control unit 150 may heat the trap 110 using a Joule heating method that generates heat in proportion to the square of the current and resistance. That is, the temperature control unit 150 can heat the trap 110 by applying a high current to the trap 110. At this time, since the bellows 115 forms a double pipe surrounding a certain portion of the trap 110, the gas concentration portion (sample portion) can be efficiently heated. The gas enriched portion (sample portion) is cooled by contacting the heat-conducting insulator 120, and the sample concentrated by cooling does not leak due to the heat remaining around the gas enriched portion (sample portion), and when heated, the gas concentrated portion (sample portion) Since there is no need to unnecessarily heat the surrounding area, the measurement precision and cooling/heating speed of trace amounts of greenhouse gases can be increased.

Conventionally, a method was used to heat the trap 110 by attaching a heater to the trap 110. However, when the trap 110 is cooled, a large load is generated on the cooler 140 due to the heat capacity of the heater, causing the cooler 140 to cool. There is a problem in that the temperature rises above the set temperature, the temperature of the trap 110 does not reach the target temperature, and the cooling rate decreases. Since the cooling process in which the temperature decreases follows exponential characteristics, the high heat capacity of the heater and the temperature of the cooler 140 take more cooling time than expected. This causes an increase in the overall analysis time for trace amounts of greenhouse gases and may cause a decrease in the precision of measuring environmental changes.

In an embodiment of the present invention, the temperature control unit 150 heats the trap 110 using a Joule heating method without using a heater, thereby solving the problem caused by the heat capacity of the heater. The temperature control unit 150 may use a solid state relay (SSR) control method or a silicon controlled rectifier (SCR) control method by applying a high current to the trap 110. The SSR control method will be described with reference to FIGS. 2 and 3, and the SCR control method will be described with reference to FIGS. 4 and 5.

Figure 2 shows a temperature control unit according to an embodiment of the present invention. Figure 3 shows the process of controlling the temperature of the trap using the temperature control unit of Figure 2.

Referring to Figures 2 and 3, the temperature control unit 150 may include a temperature sensor 151, a controller 152, an SSR switch 153, and a power supply (power supply) 154.

The temperature sensor 151 can measure the temperature of the trap 110 and provide the temperature to the controller 152 in real time. The controller 152 can control the on and off times of the SSR switch 153 using PID control (Proportional Integral Derivative control) so that the temperature of the trap 110 becomes the target temperature.

The first electrode (positive electrode) of the power supply 154 is connected to one end of the trap 110, and the second electrode (negative electrode) of the power supply 154 is connected to the trap 110 through the SSR switch 153. It can be connected to the other end of . That is, the SSR switch 153 may be connected between the second electrode (negative electrode) of the power supply 154 and the other end of the trap 110.

When the SSR switch 153 is on, the current provided from the power supply 154 flows into the trap 110, and when the SSR switch 153 is off, the current flowing into the trap 110 is blocked. It can be.

As illustrated in FIG. 3, as the SSR switch 153 repeats on and off, the temperature (current temperature) of the trap 110 may approach the target temperature. However, in the SSR control method, temperature overshoot and ripple may occur because the temperature is unconditionally controlled at maximum efficiency at the moment the SSR switch 153 is turned on.

Figure 4 shows a temperature control unit according to another embodiment of the present invention. Figure 5 shows the process of controlling the temperature of the trap using the temperature control unit of Figure 4.

Referring to FIGS. 4 and 5 , the temperature control unit 150 may include a temperature sensor 151, a controller 152, a silicon controlled rectifier (SCR) 155, and a transformer 156.

The temperature sensor 151 can measure the temperature of the trap 110 and provide the temperature to the controller 152 in real time. The controller 152 can generate a control voltage (current) through PID control according to the target temperature so that the temperature of the trap 110 becomes the target temperature and send it to the silicon controlled rectification element 155. The control voltage (current) can be generated between 0 and 100% depending on the target temperature.

The silicon controlled rectifier element 155 may generate a first voltage (for example, AC 0 to 220V) corresponding to the control voltage (current) input between 0 and 100% and send it to the transformer 156.

The transformer 156 may transform the first voltage input from the silicon controlled rectifier element 155 into a low-voltage second voltage (for example, AC 0 to 4V) and amplify the current. Even if a maximum voltage of 220V is input from the silicon controlled rectifier element 155, the transformer 156 can generate a low voltage of 3V to 4V or less and a current of several tens of A and apply it to the trap 110.

The first electrode (positive electrode) of the transformer 156 is connected to one end of the trap 110, and the second electrode (negative electrode) of the transformer 156 is connected to the other end of the trap 110, and the transformer ( Current provided from 156) may flow into the trap 10.

As illustrated in FIG. 5, the output of the silicon controlled rectifier 155 can be adjusted from 0 to 100% according to the control voltage (current) output through the PID control of the controller 152, and the output of the transformer 156 The output is also adjusted from 0 to 100% in response to the output of the silicon controlled rectifier element 155, so that the temperature (current temperature) of the trap 110 can be precisely controlled to the target temperature.

Figure 6 shows the attachment and detachment function of a trap according to another embodiment of the present invention.

Referring to FIG. 6, the trap 110 made of a stainless steel tube may be manufactured in various tube shapes depending on the configuration of the system. Figure 6 illustrates a case where the trap 110 is manufactured in a 90-degree bent shape when viewed from one side. In this case, the bellows 115 is formed as a double pipe at a certain portion of the gas inlet and gas outlet of the trap 110, and the contraction/expansion of the bellows 115 causes the trap 110 to move (for example, to 90 degrees or more). By allowing bending, the trap 110 can be attached to and detached from the heat-conducting insulator 120.

The drawings and detailed description of the invention described so far are merely illustrative of the present invention, and are used only for the purpose of explaining the present invention, and are not used to limit the meaning or scope of the present invention described in the claims. That is not the case. Therefore, those skilled in the art will understand that various modifications and other equivalent embodiments are possible therefrom. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the appended claims.

100: Detachable trap device
110: trap
115: bellows
120: heat conduction insulator
130: heat conduction substrate
140: cooler
150: Temperature control unit
151: temperature sensor
152: controller
153: SSR switch
154: power supply
155: Silicon controlled rectifier element
156: transformer
160: One wall of the vacuum chamber

Claims (10)

Traps through which gases pass for the measurement of trace amounts of greenhouse gases;
a heat-conducting insulator that contacts the trap and provides cooling and insulating functions for the trap;
a cooler that removes heat from the trap through the heat conduction insulator; and
A detachable trap device for high-speed measurement of extremely trace amounts of greenhouse gases, including a temperature control unit that heats the trap by heating the trap by applying current to the trap. According to claim 1,
The heat conduction insulator is a detachable trap device for high-speed measurement of trace amounts of greenhouse gases made of ceramic aluminum nitride. According to claim 1,
A detachable trap device for high-speed measurement of trace amounts of greenhouse gases in which a linear groove is formed in the heat-conducting insulator, and the trap is detachably attached to the groove of the heat-conducting insulator. According to clause 3,
High-speed measurement of extremely trace amounts of greenhouse gases, forming a double pipe by wrapping a portion of the trap that penetrates one wall of the vacuum chamber, and further comprising a bellows that allows movement of the trap so that it can be attached and detached to the groove of the heat-conducting insulator. Detachable trap device for. According to claims 1 to 4,
A detachable trap device for high-speed measurement of ultra-trace greenhouse gases, further comprising a heat-conducting substrate positioned between the heat-conducting insulator and the cooler to improve heat conduction efficiency between the heat-conducting insulator and the cooler. According to claim 1,
The temperature control unit,
a temperature sensor that measures the temperature of the trap;
a power supply having a first electrode connected to one end of the trap to provide current to the trap;
an SSR switch connected between a second electrode of the power supply and the other end of the trap; and
A detachable trap device for high-speed measurement of trace amounts of greenhouse gases, including a controller that controls the on and off times of the SSR switch so that the temperature of the trap becomes the target temperature. According to claim 1,
The temperature control unit,
a temperature sensor that measures the temperature of the trap;
a controller that generates a control voltage so that the temperature of the trap becomes the target temperature;
a silicon controlled rectifier that generates a first voltage corresponding to the control voltage; and
A detachable trap device for high-speed measurement of ultra-trace greenhouse gases, including a transformer that transforms the first voltage input from the silicon controlled rectifier into a low voltage second voltage, amplifies the current, and applies it to the trap. Traps through which gases pass for the measurement of trace amounts of greenhouse gases;
a temperature sensor that measures the temperature of the trap;
a power supply having a first electrode connected to one end of the trap to provide current to the trap;
an SSR switch connected between a second electrode of the power supply and the other end of the trap; and
A detachable trap device for high-speed measurement of trace amounts of greenhouse gases, including a controller that controls the on and off times of the SSR switch so that the temperature of the trap becomes the target temperature. Traps through which gases pass for the measurement of trace amounts of greenhouse gases;
a temperature sensor that measures the temperature of the trap;
a controller that generates a control voltage so that the temperature of the trap becomes the target temperature;
a silicon controlled rectifier that generates a first voltage corresponding to the control voltage; and
A detachable trap device for high-speed measurement of ultra-trace greenhouse gases, including a transformer that transforms the first voltage input from the silicon controlled rectifier into a low-voltage second voltage, amplifies the current, and applies it to the trap. A trap in the form of a stainless steel tube through which gas passes for the measurement of trace amounts of greenhouse gases;
a heat-conducting insulator having a linear groove through which the trap can be attached and detached, and providing cooling and insulating functions for the trap; and
A double tube is formed by wrapping a portion of the trap that penetrates one wall of the vacuum chamber, and a bellows is included to allow movement of the trap so that it can be attached and detached to the groove of the heat-conducting insulator for high-speed measurement of trace amounts of greenhouse gases. Detachable trap device for.

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