Conversion unit for converting nitrogen dioxide into nitric oxide

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By using low-temperature heating and catalyst joint action in the nitrogen oxide conversion device, the blockage problems caused by high-temperature requirements and excessive catalyst volume in the prior art are solved, and efficient catalytic conversion of nitrogen dioxide to nitric oxide at lower temperatures is achieved, which improves detection accuracy and device reliability.

CN222998750UActive Publication Date: 2025-06-20HARBIN TIANLONG INSTR MFG CO LTD

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Patent Information

Application Number: CN202421745052.7
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-07-23
Publication Date: 2025-06-20
Estimated Expiration: 2034-07-23

AI Technical Summary

Technical Problem

The existing nitrogen oxide conversion devices have high requirements for thermal insulation and heat-resistant materials under high temperature conditions, and the catalyst volume and total amount are strictly required, which can easily lead to pressure hold and blockage, affecting detection accuracy.

Method used

The combination of low-temperature heating and catalyst is adopted to achieve uniform heating of the gas and sufficient contact between the catalyst by combining the polycrystalline silicon insulation liner, aluminum alloy heater block and PTC heating sheet, reducing temperature requirements and preventing clogging.

Benefits of technology

The complete catalytic conversion of nitrogen dioxide to nitric oxide at lower temperatures is achieved, which avoids device damage and blockage caused by excessive temperatures, and improves detection accuracy and device reliability.

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Abstract

A conversion unit for converting nitrogen dioxide into nitric oxide comprises a conversion unit shell, a conversion unit base, a conversion unit support, a polycrystalline silicon heat preservation inner container, an aluminum alloy soaking block, a ptc heating piece, a first foam metal filtering piece, a set screw and a stainless steel pipe. The left side and the right side of the conversion unit base are connected with the multiple conversion unit supports, a polycrystalline silicon heat preservation inner container is arranged in the conversion unit shell and connected with the upper side of a quartz wool gasket, the lower side of the quartz wool gasket is connected with the conversion unit base, and an aluminum alloy soaking block is arranged in the polycrystalline silicon heat preservation inner container. The left side and the right side of the aluminum alloy soaking block are each provided with a plurality of ptc heating pieces, and a temperature control switch is arranged on the lower side of the front end of the aluminum alloy soaking block.

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Description

Technical Field

[0001] The utility model relates to the field of nitrogen dioxide conversion to nitric oxide, in particular to a conversion unit for nitrogen dioxide conversion to nitric oxide. Background Art

[0002] In the field of chemical experiments, traditional nitrogen oxide conversion devices convert nitrogen dioxide to nitric oxide by using the principle of high temperature or by using the principle of catalyst. The former requires too high a temperature, and has high requirements for heat preservation and heat resistance of the device materials. The latter has extremely strict requirements for the volume and total amount of catalyst particles. If the volume is too large and the total amount is too much, it is easy to cause pressure buildup, block the pipeline and filter screen. If the volume is too small and the total amount is too little, the reaction is incomplete, resulting in measurement deviation of the detection equipment, and there are drawbacks. Content of the Utility Model

[0003] In view of the above deficiencies of the prior art, the utility model provides a conversion unit for nitrogen dioxide conversion to nitric oxide, which realizes complete catalysis at a lower temperature through the combined action of low-temperature heating and a catalyst, and is not easy to block the pipeline and filter screen.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] A conversion unit for nitrogen dioxide conversion to nitric oxide includes a conversion unit housing, a conversion unit base, a conversion unit bracket, a polysilicon heat preservation inner liner, an aluminum alloy heat equalizing block, a PTC heating sheet, a first foam metal filter sheet, a set screw, and a stainless steel pipe. The lower side of the conversion unit housing is connected to the upper side of the conversion unit base, and the left and right sides of the conversion unit base are connected to a plurality of conversion unit brackets. A polysilicon heat preservation inner liner is provided inside the conversion unit housing. The upper side of the polysilicon heat preservation inner liner is connected to a quartz cotton gasket, and the lower side of the quartz cotton gasket is connected to the conversion unit base. An aluminum alloy heat equalizing block is provided inside the polysilicon heat preservation inner liner. A plurality of PTC heating sheets are respectively provided on the left and right sides of the aluminum alloy heat equalizing block, and a temperature control switch is provided on the lower side of the front end of the aluminum alloy heat equalizing block.

[0006] The stainless steel pipe of the utility model passes through the conversion unit base, the quartz cotton gasket, the aluminum alloy heat equalizing block, the polysilicon heat preservation inner liner, and the conversion unit housing from bottom to top in sequence. The set screw passes through the middle of the front end of the aluminum alloy heat equalizing block, and the rear side of the set screw contacts the outer side of the stainless steel pipe.

[0007] A first elastic card is provided on the upper side inside the stainless steel pipe of the utility model, and a second elastic card is provided on the lower side inside the stainless steel pipe. The upper side of the second elastic card contacts the lower end of the second foam metal filter sheet, and the lower side of the first elastic card contacts the upper end of the first foam metal filter sheet. A catalyst is filled between the first foam metal filter sheet and the second foam metal filter sheet.

[0008] The aluminum alloy soaking block of the present utility model is connected in parallel with the positive electrode of the aluminum alloy soaking block through a wire. The positive electrode of the aluminum alloy soaking block is connected in series with one end of a temperature control switch through a wire, and the other end of the temperature control switch is connected to a power supply through a wire. The aluminum alloy soaking block is connected in parallel with the negative electrode of the aluminum alloy soaking block through a wire, and the negative electrode of the aluminum alloy soaking block is connected to the power supply through a wire. Beneficial effects

[0009] The present utility model is fixed inside the stainless steel tube by the elastic forces of the first elastic card and the second elastic card, and the first foam metal filter sheet and the second foam metal filter sheet are fixed in the middle. Then, catalyst particles are filled between the internal volume formed by the stainless steel tube, the first foam metal filter sheet, and the second foam metal filter sheet, so that the gas containing nitrogen dioxide flows slowly when passing through the catalyst, thereby fully contacting the catalyst, strengthening the reaction effect between nitrogen dioxide and the catalyst. Moreover, the PTC heating sheet evenly transfers heat to the stainless steel tube and the catalyst through the aluminum alloy soaking block, uniformly heating the gas. By the combined action of heating and the catalyst, the introduced nitrogen dioxide is converted into nitric oxide for detection by an elemental analyzer, reducing the measurement deviation of the detection equipment.

[0010] The present utility model controls the on-off of the PTC heating sheet through a temperature control switch to keep the internal temperature constant, ensuring full conversion of the gas while preventing component damage due to excessive temperature inside. And through the heating of the PTC heating sheet and the catalytic action of the catalyst, complete catalysis is achieved at a relatively low temperature, and the purpose of not easily blocking the pipeline and filter screen is realized.

[0011] The present utility model converts the introduced nitrogen dioxide into nitric oxide for detection by an elemental analyzer through the combined action of heating and the catalyst. During the conversion process, the temperature inside the stainless steel tube is constant, ensuring uniform heating and full conversion of the gas while preventing component damage due to excessive temperature inside. Moreover, the gas containing nitrogen dioxide flows slowly when passing through the catalyst, thereby fully contacting the catalyst, strengthening the reaction effect between nitrogen dioxide and the catalyst, thus achieving complete catalysis at a relatively low temperature, preventing the occurrence of pressure buildup or blocking of the pipeline and filter screen, and reducing the measurement deviation of the detection equipment. Description of the drawings

[0012] Figure 1 It is a schematic structural diagram of a conversion unit for converting nitrogen dioxide to nitric oxide according to the present utility model.

[0013] Figure 2 It is an exploded view of the structural diagram of a conversion unit for converting nitrogen dioxide to nitric oxide according to the present utility model.

[0014] Figure 3 It is a cross-sectional view of the structural diagram of a conversion unit for converting nitrogen dioxide to nitric oxide according to the present utility model.

[0015] Figure 4 Left view of the conversion unit structure for converting nitrogen dioxide to nitric oxide according to the present utility model.

[0016] Figure 5 Right view of the conversion unit structure for converting nitrogen dioxide to nitric oxide according to the present utility model.

[0017] Figure 6 Side sectional view of the conversion unit structure for converting nitrogen dioxide to nitric oxide according to the present utility model.

[0018] Figure 7 Top view of the conversion unit structure for converting nitrogen dioxide to nitric oxide according to the present utility model.

[0019] Figure 8 Bottom view of the conversion unit structure for converting nitrogen dioxide to nitric oxide according to the present utility model.

[0020] Figure 9 Sectional view of the conversion unit structure for converting nitrogen dioxide to nitric oxide according to the present utility model.

[0021] Figure 10 Front view of the conversion unit structure for converting nitrogen dioxide to nitric oxide according to the present utility model. Detailed implementation manner

[0022] The present utility model will be further described in detail below with reference to the drawings and embodiments:

[0023] Embodiment 1:

[0024] A conversion unit for converting nitrogen dioxide to nitric oxide, comprising a conversion unit housing 01, a conversion unit base 02, a conversion unit bracket 03, a polysilicon heat-insulating inner liner 04, an aluminum alloy heat equalizing block 05, a PTC heating sheet 06, a first foam metal filter sheet 07, a set screw 11, and a stainless steel pipe 15. The lower side of the conversion unit housing 01 is connected to the upper side of the conversion unit base 02, and the left and right sides of the conversion unit base 02 are connected to a plurality of conversion unit brackets 03. A polysilicon heat-insulating inner liner 04 is provided inside the conversion unit housing 01. The upper side of the polysilicon heat-insulating inner liner 04 is connected to a quartz wool gasket 12, and the lower side of the quartz wool gasket 12 is connected to the conversion unit base 02. An aluminum alloy heat equalizing block 05 is provided inside the polysilicon heat-insulating inner liner 04. A plurality of PTC heating sheets 06 are respectively provided on the left and right sides of the aluminum alloy heat equalizing block 05. A temperature control switch 10 is provided on the lower front side of the aluminum alloy heat equalizing block 05. This device converts the introduced nitrogen dioxide into nitric oxide for elemental analyzer detection by the combined action of heating and a catalyst. During the conversion process, the temperature inside the stainless steel pipe 15 is constant, ensuring uniform heating of the gas and sufficient conversion. At the same time, the components inside will not be damaged due to excessive temperature. Moreover, the speed of the gas containing nitrogen dioxide slows down when flowing through the catalyst 08, so as to fully contact the catalyst 08, strengthen the reaction effect between nitrogen dioxide and the catalyst 08, thereby achieving complete catalysis at a lower temperature, preventing the occurrence of pressure buildup, or blocking the pipeline and filter screen, and reducing the measurement deviation of the detection equipment.

[0025] Example 2:

[0026] The stainless steel pipe 15 of the present utility model sequentially passes through the conversion unit base 02, the quartz wool gasket 12, the aluminum alloy heat equalizing block 05, the polysilicon heat-insulating inner liner 04, and the conversion unit housing 01 from bottom to top. The set screw 11 passes through the middle of the front end of the aluminum alloy heat equalizing block 05, and the rear side of the set screw 11 contacts the outer side of the stainless steel pipe 15.

[0027] Example 3:

[0028] Inside the upper side of the stainless steel pipe 15 of the present utility model, there is a first elastic card 09, and inside the lower side of the stainless steel pipe 15, there is a second elastic card 14. The upper side of the second elastic card 14 contacts the lower end of the second foam metal filter 13, and the lower side of the first elastic card 09 contacts the upper end of the first foam metal filter 07. A catalyst 08 is filled between the first foam metal filter 07 and the second foam metal filter 13. This device is fixed inside the stainless steel pipe 15 by the elastic forces of the first elastic card 09 and the second elastic card 14, and the first foam metal filter 07 and the second foam metal filter 13 are fixed in the middle. Then, catalyst 08 particles are filled in the internal volume formed by the stainless steel pipe 15, the first foam metal filter 07, and the second foam metal filter 13, so that the speed of the gas containing nitrogen dioxide slows down when flowing through the catalyst 08, thereby fully contacting the catalyst 08, strengthening the reaction effect between the nitrogen dioxide and the catalyst 08. Moreover, the PTC heating sheet 06 evenly transfers heat to the stainless steel pipe 15 and the catalyst 08 through the aluminum alloy heat sink 05, evenly heating the gas. By the combined action of heating and the catalyst, the introduced nitrogen dioxide is converted into nitric oxide for detection by the elemental analyzer, reducing the measurement deviation of the detection equipment.

[0029] Example 4:

[0030] The aluminum alloy heat sink 05 of the present utility model is connected in parallel with the positive pole of the aluminum alloy heat sink 05 through a wire. The positive pole of the aluminum alloy heat sink 05 is connected in series with one end of a temperature control switch 10 through a wire, and the other end of the temperature control switch 10 is connected to the power supply through a wire. The aluminum alloy heat sink 05 is connected in parallel with the negative pole of the aluminum alloy heat sink 05 through a wire, and the negative pole of the aluminum alloy heat sink 05 is connected to the power supply through a wire. This device controls the on-off of the PTC heating sheet 06 through the temperature control switch 10 to control the internal temperature to be constant, ensuring that the gas is fully converted, and at the same time, the components inside will not be damaged due to excessive temperature. And through the heating of the PTC heating sheet 06 and the combined action of the catalysis of the catalyst 08, complete catalysis at a lower temperature is achieved, and the purpose of not easily blocking the pipeline and the filter screen is realized.

[0031] Example 5:

[0032] Installation steps: First, assemble the structure of the conversion unit housing 01. First, install and fix the PTC heating sheet 06 on the left and right sides of the aluminum alloy heat sink 05. Then, place the aluminum alloy heat sink 05 and multiple PTC heating sheets 06 inside the polysilicon heat preservation inner liner 04. One end of the temperature control switch 10 provided at the lower side of the front end of the aluminum alloy heat sink 05 is connected in series with the positive pole of the aluminum alloy heat sink 05 through a wire. The other end of the temperature control switch 10 is connected to the power supply through a wire. The aluminum alloy heat sink 05 is connected in parallel with the negative pole of the aluminum alloy heat sink 05 through a wire. The negative pole of the aluminum alloy heat sink 05 is connected to the power supply through a wire. Then, place the polysilicon heat preservation inner liner 04 inside the conversion unit housing 01. Then, fixedly connect the upper side of the conversion unit base 02 and the lower side of the conversion unit housing 01. The upper side of the quartz wool gasket 12 is connected to the polysilicon heat preservation inner liner 04, and the lower side of the quartz wool gasket 12 is connected to the conversion unit base 02. Finally, install and fix multiple conversion unit brackets 03 on the left and right sides of the conversion unit base 02. After completing the assembly of the conversion unit housing 01 structure, assemble the stainless steel pipe 15 structure. First, fix the first foam metal filter 07 and the second foam metal filter 13 in the middle of the stainless steel pipe 15. Then, fill the 08 particles between the internal volume formed by the stainless steel pipe 15, the first foam metal filter 07, and the second foam metal filter 13. Then, fix it inside the stainless steel pipe 15 by the elastic force of the first elastic card 09 and the second elastic card 14. Then, pass the stainless steel pipe 15 through the conversion unit base 02, the quartz wool gasket 12, the aluminum alloy heat sink 05, the polysilicon heat preservation inner liner 04, and the conversion unit housing 01 from bottom to top. Finally, pass the set screw 11 through the middle of the front end of the aluminum alloy heat sink 05, and the rear side of the set screw 11 contacts the outer side of the stainless steel pipe 15 to complete the installation.

Claims

1. A nitrogen dioxide to nitric oxide conversion unit, characterized in that : comprising a conversion unit shell (01), a conversion unit base (02), a conversion unit bracket (03), a polysilicon heat-insulating liner (04), an aluminum alloy heat-saturating block (05), a PTC heating plate (06), a first foam metal filter (07), a set screw (11), and a stainless steel pipe (15), wherein the lower side of the conversion unit shell (01) is connected to the upper side of the conversion unit base (02), the left and right sides of the conversion unit base (02) are connected to a plurality of conversion unit brackets (03), and the conversion unit shell (01) is provided with a polysilicon heat-insulating liner (04) inside. The polysilicon thermal insulation liner (04) is connected to the upper side of the quartz wool gasket (12), and the lower side of the quartz wool gasket (12) is connected to the conversion unit base (02). An aluminum alloy heat-absorbing block (05) is provided inside the polysilicon thermal insulation liner (04), and a plurality of PTC heating plates (06) are provided on the left and right sides of the aluminum alloy heat-absorbing block (05). A temperature control switch (10) is provided on the lower side of the front end of the aluminum alloy heat-absorbing block (05). The stainless steel tube (15) passes through the conversion unit base (02), the quartz wool gasket (12), the aluminum alloy heat-absorbing block (05), the polysilicon thermal insulation liner (04), and the conversion unit housing (01) in sequence from bottom to top. The set screw (11) passes through the middle of the front end of the aluminum alloy heat-absorbing block (05), and the rear side of the set screw (11) contacts the outer side of the stainless steel tube (15).

2. A nitrogen dioxide to nitric oxide conversion unit according to claim 1, characterized in that A first elastic card (09) is provided on the upper side of the interior of the stainless steel tube (15), and a second elastic card (14) is provided on the lower side of the interior of the stainless steel tube (15); the upper side of the second elastic card (14) is in contact with the lower end of the second foam metal filter (13).

3. A nitrogen dioxide to nitric oxide conversion unit according to claim 2, characterized in that : The lower side of the first elastic card (09) contacts the upper end of the first foam metal filter (07), and the catalyst (08) is filled between the first foam metal filter (07) and the second foam metal filter (13).

4. A nitrogen dioxide to nitric oxide conversion unit according to claim 3, characterized in that : The aluminum alloy equalizing block (05) is connected in parallel with the positive electrode of the aluminum alloy equalizing block (05) through a wire, the positive electrode of the aluminum alloy equalizing block (05) is connected in series with one end of the temperature control switch (10) through a wire, the other end of the temperature control switch (10) is connected to a power supply through a wire, the aluminum alloy equalizing block (05) is connected in parallel with the negative electrode of the aluminum alloy equalizing block (05) through a wire, and the negative electrode of the aluminum alloy equalizing block (05) is connected to a power supply through a wire.