CN213930984U - Efficient catalytic combustion device - Google Patents
Efficient catalytic combustion device Download PDFInfo
- Publication number
- CN213930984U CN213930984U CN202023008196.9U CN202023008196U CN213930984U CN 213930984 U CN213930984 U CN 213930984U CN 202023008196 U CN202023008196 U CN 202023008196U CN 213930984 U CN213930984 U CN 213930984U
- Authority
- CN
- China
- Prior art keywords
- chamber
- electric heating
- combustion chamber
- box body
- communicated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model relates to a high-efficiency catalytic combustion device, which comprises a device box body, wherein the device box body comprises a box body shell and a box body inner container, a heat exchanger chamber is arranged at the lower part in the box body inner container, an electric heating chamber is arranged at the upper part in the box body inner container, the device comprises an oxidation combustion chamber, wherein an air inlet channel and an air outlet channel are arranged in a heat exchanger chamber, the air inlet channel and the air outlet channel form heat transfer connection, one end of the air inlet channel is communicated with an air inlet at one side of the lower part of the heat exchanger chamber, the other end of the air inlet channel is communicated with the bottom of an electric heating chamber, a plurality of rows of electric heating pipe groups are arranged in the electric heating chamber, the top of the electric heating chamber is communicated with the oxidation combustion chamber, a catalyst support is arranged in the oxidation combustion chamber, a catalyst is arranged on the catalyst support, one end of the air outlet channel is communicated with an air outlet at the other side of the lower part of the heat exchanger chamber, and the other end of the air outlet channel is communicated with the bottom of the oxidation combustion chamber. The utility model discloses a catalytic combustion device scheme of heat transfer design with energy-conserving function has the high characteristics of energy utilization.
Description
Technical Field
The utility model relates to a volatile organic waste gas purification device, in particular to efficient volatile organic waste gas catalytic combustion device belongs to volatile organic waste gas and administers the field.
Background
At present, the treatment of volatile organic waste gas with large air volume and low concentration mostly adopts the combined technical scheme of active carbon and a catalytic combustion device, and the catalytic combustion device plays a main role in the technical scheme. The catalytic combustion device is a combined structure and is formed by combining an electric heating chamber and an oxidation combustion chamber, and the catalytic combustion device has the function of oxidizing volatile organic waste gas into purified gas. Wherein, the electric heating chamber is internally provided with an electric heater which is used for heating the volatile organic waste gas to reach the reaction temperature so as to carry out sufficient reaction after the waste gas enters the oxidation combustion chamber. The oxidation combustion chamber is internally provided with the honeycomb ceramic catalyst, so that the effective contact time of the volatile organic waste gas and the honeycomb ceramic catalyst is prolonged, and the purification efficiency of the volatile organic waste gas is ensured. Therefore, the reasonable structural design is the premise of ensuring that the catalytic combustion device can efficiently treat the volatile organic waste gas.
SUMMERY OF THE UTILITY MODEL
The utility model discloses efficient catalytic combustion device discloses new scheme, adopts the catalytic combustion device scheme that has the heat transfer design of energy-conserving function, has solved the current problem that energy utilization is not high in the reaction process of like product heating and catalytic oxidation volatility organic waste gas.
The utility model discloses efficient catalytic combustion device includes the device box, the device box includes the box shell, the box inner bag, lower part in the box inner bag is equipped with the heat exchanger room, upper portion in the box inner bag is equipped with the electric heating chamber, the oxidation combustion chamber, be equipped with inlet channel in the heat exchanger room, air outlet channel, inlet channel forms heat transfer connection with air outlet channel, inlet channel's one end and the air inlet intercommunication of one side of heat exchanger room lower part, inlet channel's the other end and the bottom intercommunication of electric heating chamber, be equipped with multirow electric heating pipe group in the electric heating chamber, the top and the oxidation combustion chamber intercommunication of electric heating chamber, be equipped with the catalyst support in the oxidation combustion chamber, be equipped with the catalyst on the catalyst support, the one end of air outlet channel and the gas outlet intercommunication of the opposite side of heat exchanger room lower part, air outlet channel's the other end and the bottom intercommunication of oxidation combustion chamber.
Furthermore, a plurality of transverse baffles are arranged in the heat exchanger chamber in the vertical direction, the heat exchanger chamber is divided into a plurality of airflow channel layers by the transverse baffles, a group of separated airflow channel layers in the airflow channel layers are communicated end to end in the left-right direction to form an air inlet channel with a zigzag cross section, another group of separated airflow channel layers in the airflow channel layers are communicated end to end in the left-right direction to form an air outlet channel with a zigzag cross section, and volatile organic waste gas in the air inlet channel exchanges heat with purified gas in the air outlet channel through the transverse baffles.
Furthermore, the motor heat pipe group of this scheme includes a plurality of "W" type electric heating pipe that stands up the setting side by side, and "W" type electric heating pipe passes through binding post and is connected with external power source.
Furthermore, the catalyst support of this scheme includes a plurality of along the grid formula support unit of vertical setting, and grid formula support unit includes the multilayer grid layer, and the grid layer intussuseption is equipped with the catalyst, and the top on grid layer is equipped with a plurality of "W" type electric heating pipes that are put side by side horizontally.
Furthermore, the top export top of the electric heating chamber of this scheme is equipped with the guide plate A to the top import slope of oxidation combustion chamber, and the top import top of oxidation combustion chamber is equipped with the guide plate B to the top import slope of oxidation combustion chamber, and the top import department of oxidation combustion chamber is equipped with the flow equalizing plate, and the top export combustion gas from the electric heating chamber passes through the top import that the flow equalizing plate got into the oxidation combustion chamber through guide plate A, guide plate B direction.
Further, an outer heat preservation layer is arranged between the box body shell and the box body inner container, and an inner heat preservation layer is arranged on the inner side of the oxidation combustion chamber.
Further, the top of the device box of this scheme is equipped with lets out and explodes the opening, lets out to explode the opening part and is equipped with let out and explode the piece.
The utility model discloses efficient catalytic combustion device adopts the catalytic combustion device scheme of the heat transfer design that has energy-conserving function, has the characteristics that energy utilization is high.
Drawings
FIG. 1 is a front internal schematic view of a high efficiency catalytic combustion device.
FIG. 2 is a left side internal partial schematic view of a high efficiency catalytic combustion device.
FIG. 3 is a schematic top view of a high efficiency catalytic combustion device.
Fig. 4 is a schematic cross-sectional view of the apparatus casing.
Wherein, 1 is an air inlet, 2 is an air outlet, 3 is the cross trend of inlet air flow and outlet air flow in the heat exchanger chamber, 4 is the walking direction of outlet air flow, 5 is the trend of inlet air flow, 6 is a thermocouple, 7 is an electric heating chamber, 8 is a W-shaped electric heating pipe, 9 is a guide plate A, 10 is an explosion venting sheet, 11 is a thermocouple, 12 is a flow equalizing plate, 13 is an inner heat-insulating layer, 14 is a catalyst, 15 is an oxidation combustion chamber, 16 is a heat exchanger chamber, 17 is a catalyst support, 18 is an outer heat-insulating layer, 19 is a box body inner container, and 20 is a box body outer shell.
Detailed Description
As shown in figures 1-3, the high-efficiency catalytic combustion device of the utility model comprises a device box body, the device box body comprises a box body shell and a box body inner container, a heat exchanger chamber is arranged at the lower part in the box body inner container, an electric heating chamber is arranged at the upper part in the box body inner container, the device comprises an oxidation combustion chamber, wherein an air inlet channel and an air outlet channel are arranged in a heat exchanger chamber, the air inlet channel and the air outlet channel form heat transfer connection, one end of the air inlet channel is communicated with an air inlet at one side of the lower part of the heat exchanger chamber, the other end of the air inlet channel is communicated with the bottom of an electric heating chamber, a plurality of rows of electric heating pipe groups are arranged in the electric heating chamber, the top of the electric heating chamber is communicated with the oxidation combustion chamber, a catalyst support is arranged in the oxidation combustion chamber, a catalyst is arranged on the catalyst support, one end of the air outlet channel is communicated with an air outlet at the other side of the lower part of the heat exchanger chamber, and the other end of the air outlet channel is communicated with the bottom of the oxidation combustion chamber. Above-mentioned scheme adopts the catalytic combustion device scheme that has the heat transfer design of energy-conserving function, volatile organic waste gas gets into inlet channel from inlet channel, waste gas gets into the electric heating chamber through inlet channel, waste gas in the electric heating chamber carries out the heat exchange with electric heating pipe group and rises to the reaction temperature of settlement, the waste gas of intensification gets into the oxidation combustion chamber and carries out oxidation reaction and form the high temperature purified gas, the high temperature purified gas gets into the passageway of giving vent to anger from the bottom of oxidation combustion chamber, the high temperature purified gas that gets into the passageway of giving vent to anger carries out the heat exchange with the waste gas in the inlet channel, thereby make waste gas carry out preliminary intensification before getting into the electric heating chamber, the technical purpose of energy recycle has been realized, energy utilization rate has been improved.
In order to meet the requirement of sufficient heat exchange between the inlet channel and the outlet channel, as shown in fig. 1, a plurality of transverse baffles (not shown) are arranged in the heat exchanger chamber in the vertical direction, the transverse baffles divide the heat exchanger chamber space into a plurality of airflow channel layers, one group of the airflow channel layers which are separated from each other in the airflow channel layers are communicated end to end in the left-right direction to form an inlet channel with a zigzag cross section, the other group of the airflow channel layers which are separated from each other in the airflow channel layers are communicated end to end in the left-right direction to form an outlet channel with a zigzag cross section, and the volatile organic waste gas in the inlet channel exchanges heat with the purified gas in the outlet channel through the transverse baffles. Waste gas rises into the electric heating chamber from bottom to top along the inlet channel in a zigzag mode, purified gas falls from top to bottom along the outlet channel in a zigzag mode and is discharged from the gas outlet, and therefore the heat exchange of the high-temperature purified gas and the waste gas in a cross reverse flowing mode is achieved, and the heat exchange efficiency is improved.
In order to improve the heat release efficiency of the electric heating pipe set, as shown in fig. 2, the electric heating pipe set of the present scheme includes a plurality of W-shaped electric heating pipes erected side by side, and the W-shaped electric heating pipes are connected with an external power supply through connection terminals. Compared with the U-shaped electric heating pipe, the W-shaped electric heating pipe has the advantages that the heat exchange efficiency and the heat productivity are greatly improved.
In order to improve the catalytic efficiency and the utilization rate of the catalyst, increase the contact area and the contact time of the exhaust gas and the catalyst, and maintain the temperature of the exhaust gas within a set reaction temperature threshold range, as shown in fig. 1, the catalyst support of the scheme comprises a plurality of grid-type support units arranged along the vertical direction, each grid-type support unit comprises a plurality of grid layers, the catalyst is filled in each grid layer, and a plurality of W-shaped electric heating pipes which are arranged in parallel and horizontally are arranged above the grid layers.
In order to ensure that the gas flows stably in the flow channel according to a predetermined route, the waste gas is uniformly contacted and reacted with the catalyst, and the oxidation effect is improved, as shown in fig. 1, a guide plate A inclined towards the top inlet of the oxidation combustion chamber is arranged above the top outlet of the electric heating chamber, a guide plate B inclined towards the top inlet of the oxidation combustion chamber is arranged above the top inlet of the oxidation combustion chamber, a flow equalizing plate is arranged at the top inlet of the oxidation combustion chamber, and the gas discharged from the top outlet of the electric heating chamber is guided by the guide plate A and the guide plate B to enter the top inlet of the oxidation combustion chamber through the flow equalizing plate. The air flow is guided by the guide plate A and the guide plate B to form a stable flowing state, and the air flow is uniformly contacted with the catalyst after being equalized by the equalizing plate.
In order to strengthen the heat preservation effect, avoid the steel construction contact of catalyst and oxidation combustion chamber inboard, as shown in fig. 1, 4, be equipped with outer heat preservation between the box shell of this scheme and box inner bag, be equipped with interior heat preservation on the inboard of oxidation combustion chamber. In order to meet the explosion venting requirement, as shown in fig. 1, an explosion venting opening is formed in the top of the device box body, and an explosion venting sheet is arranged at the explosion venting opening.
This scheme discloses a can administer volatile organic waste gas can not produce secondary pollution's high-efficient purifier, specifically is a practical structure that can improve volatile organic waste gas catalytic combustion purification efficiency, realizes this purpose through reasonable overall arrangement, structural design.
In a first aspect, the present solution provides a further improvement over the conventional approach in terms of the arrangement and assembly of the electric heating tube. The electric heating pipe in the device adopts a W-shaped electric heating pipe (traditionally adopts a U-shaped electric heating pipe), the heating section of the W-shaped electric heating pipe is relatively enlarged compared with the traditional heating section, so as to prolong the time required by the volatile organic waste gas to pass through the electric heating chamber area, thereby the volatile organic waste gas is heated more evenly, simultaneously, 3W-shaped electric heating pipes are adopted as one group, the W-shaped electric heating pipes are divided into a plurality of groups and are designed and arranged in a crossed way, and the PLC control system is used for reasonably designing the on-heating and off-heating of each group, so as to ensure the catalytic combustion effect of the subsequent catalyst on the volatile organic waste gas and improve the purification efficiency, and simultaneously, because the W-shaped electric heating pipe adopts a plurality of groups of controls, the internal temperature of the reactor in the catalytic combustion device is easier to control, so that the temperature in the oxidation combustion chamber is always kept in a reasonable temperature range.
In the second aspect, the catalyst is improved in the arrangement, the catalyst support adopts a self-made grid type structure, and the self-made grid type structure enables the contact area of the catalyst to be larger by about 30% than that of the traditional catalyst, so that the utilization rate of original holes of the catalyst can be improved, the contact area of volatile organic waste gas and the surface of the catalyst is increased, and the contact time of the volatile organic waste gas and the catalyst and the utilization rate of the catalyst are prolonged.
In the third aspect, the scheme is that a flow guide plate and a flow equalizing plate are arranged in the electric heater chamber and the oxidation combustion chamber. Compared with the traditional structure, the wind speed of the windward side of the catalyst in the reaction chamber is more uniform, so that the catalytic combustion effect of the volatile organic waste gas can be obviously improved.
The structure of a guide plate (code number: 9) and a flow equalizing plate (code number: 12) are added in the electric heating chamber (code number: 7) and the oxidation combustion chamber (code number: 15), so that the generation of vortex is avoided, the uniformity of airflow in the flowing process is further improved, the uniform interception of airflow flowing into the catalyst (code number: 14) is further ensured, meanwhile, the utilization rate of effective holes of the catalyst (code number: 14) is increased by the improved catalyst support (code number: 17), the contact area of the volatile organic waste gas and the catalyst (code number: 14) can be increased, the uniformity of the section wind speed of the air-facing quantity of the catalyst (code number: 14) is adjusted, the catalytic oxidation combustion efficiency of the volatile organic waste gas is improved, and the purification efficiency of the volatile organic waste gas is improved.
The fourth direction, this scheme has carried out the innovation to the heat exchanger structure, on the basis of heat exchanger original structure, has increased horizontal flow distribution plate, can increase 20 ~ 40% with the effective area of the contact of the incoming and outgoing air current like this, makes the heat utilization ratio increase.
In the heat exchanger (code number: 16), by adding a transverse baffle plate in the heat exchanger (code number: 16) for shunting, prolonging the retention time of airflow in the heat exchanger (code number: 16) and increasing the crossing times and effective contact area of the inlet airflow and the outlet airflow, the structure design can ensure that the device achieves the optimal heat exchange effect and improve the heat recovery rate.
In the fifth aspect, an inner heat-insulating layer is arranged in the oxidation combustion chamber, so that the catalyst is prevented from directly contacting with the side steel plate, gaps between the catalyst and the steel plate can be greatly reduced, the heat-insulating effect of the catalyst layer can be enhanced, the temperature rise time of the catalyst is further shortened, the inner heat-insulating layer is not added in the traditional catalytic combustion device, and the innovation is original to the scheme. And an outer heat-insulating layer is filled between the inner container and the shell. The outer heat preservation layer that other producers set up generally is only 50 ~ 100mm, and the thickness that this scheme set up is 200 ~ 250mm, can be abundant reduce the heat and to external transmission, provide the powerful guarantee for the intensification of catalyst layer.
The heat insulation layer is filled between the inner container (code number: 19) and the outer shell (code number: 20), the thickness of the filled outer heat insulation layer (code number: 18) is about 200mm, the thickness is summarized through thermal calculation and practical experience, the heat insulation layer filled according to the thickness can ensure that the temperature of the outer shell is lower than 60 ℃ required in the national standard, the heat insulation effect is good, and the loss of heat loss of the outer shell is reduced.
Through the design to above five aspects, catalytic combustion device has had the improvement of essence structurally, just also can improve catalytic combustion's effect, improves volatile organic waste gas's purification efficiency to guarantee that catalytic combustion device is safe, steady, the standard ground operation, also provide the guarantee for improving the environment.
The devices and components disclosed in the present disclosure may be implemented by general and conventional means known in the art, unless otherwise specified. The efficient catalytic combustion device of the present invention is not limited to the disclosure of the specific embodiments, the technical solutions presented in the examples can be extended based on the understanding of those skilled in the art, and the simple alternatives made by those skilled in the art according to the present invention in combination with the common general knowledge also belong to the scope of the present invention.
Claims (7)
1. A high-efficiency catalytic combustion device is characterized by comprising a device box body, wherein the device box body comprises a box body shell and a box body inner container, a heat exchanger chamber is arranged at the lower part in the box body inner container, an electric heating chamber and an oxidation combustion chamber are arranged at the upper part in the box body inner container, an air inlet channel and an air outlet channel are arranged in the heat exchanger chamber, the air inlet channel and the air outlet channel form heat transfer connection, one end of the air inlet channel is communicated with an air inlet at one side of the lower part of the heat exchanger chamber, the other end of the air inlet channel is communicated with the bottom of the electric heating chamber, a multi-row electric heating pipe set is arranged in the electric heating chamber, the top of the electric heating chamber is communicated with the oxidation combustion chamber, a catalyst support is arranged in the oxidation combustion chamber, a catalyst is arranged on the catalyst support, one end of the air outlet channel is communicated with an air outlet at the other side of the lower part of the heat exchanger chamber, the other end of the air outlet channel is communicated with the bottom of the oxidation combustion chamber.
2. The efficient catalytic combustion device as recited in claim 1, wherein a plurality of transverse baffles are disposed in the heat exchanger chamber along the up-down direction, the transverse baffles divide the space in the heat exchanger chamber into a plurality of airflow channel layers, one group of separated airflow channel layers in the plurality of airflow channel layers are communicated end to end along the left-right direction to form the inlet channel with a zigzag cross section, another group of separated airflow channel layers in the plurality of airflow channel layers are communicated end to end along the left-right direction to form the outlet channel with a zigzag cross section, and the volatile organic waste gas in the inlet channel exchanges heat with the purified gas in the outlet channel through the transverse baffles.
3. The efficient catalytic combustion device as set forth in claim 1, wherein the electric heating tube assembly comprises a plurality of W-shaped electric heating tubes standing side by side, and the W-shaped electric heating tubes are connected with an external power source through terminals.
4. The high efficiency catalytic combustion device as set forth in claim 1, wherein the catalyst support comprises a plurality of grid support units disposed in an up-down direction, the grid support units comprise a plurality of grid layers filled with catalyst, and a plurality of W-shaped electric heating tubes disposed in parallel and in a horizontal arrangement are disposed above the grid layers.
5. The efficient catalytic combustion device as set forth in claim 1, wherein a flow guide plate A is disposed above the top outlet of the electric heating chamber and inclined toward the top inlet of the oxidizing combustion chamber, a flow guide plate B is disposed above the top inlet of the oxidizing combustion chamber and inclined toward the top inlet of the oxidizing combustion chamber, a flow equalizing plate is disposed at the top inlet of the oxidizing combustion chamber, and the gas exhausted from the top outlet of the electric heating chamber is guided by the flow guide plates A and B to enter the top inlet of the oxidizing combustion chamber.
6. The efficient catalytic combustion device of claim 1, wherein an outer insulating layer is disposed between the casing and the casing inner container, and an inner insulating layer is disposed on an inner side of the oxidative combustion chamber.
7. The high efficiency catalytic combustion device of claim 1, wherein the top of the device housing is provided with an explosion venting opening, and the explosion venting opening is provided with an explosion venting sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023008196.9U CN213930984U (en) | 2020-12-15 | 2020-12-15 | Efficient catalytic combustion device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023008196.9U CN213930984U (en) | 2020-12-15 | 2020-12-15 | Efficient catalytic combustion device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213930984U true CN213930984U (en) | 2021-08-10 |
Family
ID=77152290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023008196.9U Active CN213930984U (en) | 2020-12-15 | 2020-12-15 | Efficient catalytic combustion device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213930984U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113731103A (en) * | 2021-09-07 | 2021-12-03 | 福建师范大学 | Efficient and energy-saving volatile organic compound treatment equipment |
| CN113757698A (en) * | 2021-08-26 | 2021-12-07 | 中科新天地（合肥）环保科技有限公司 | Organic waste gas purifies uses environmental protection and energy saving type catalytic combustion stove |
| WO2023232155A1 (en) * | 2022-05-30 | 2023-12-07 | 常州捷佳创智能装备有限公司 | Combustion apparatus and sintering device |
-
2020
- 2020-12-15 CN CN202023008196.9U patent/CN213930984U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113757698A (en) * | 2021-08-26 | 2021-12-07 | 中科新天地（合肥）环保科技有限公司 | Organic waste gas purifies uses environmental protection and energy saving type catalytic combustion stove |
| CN113731103A (en) * | 2021-09-07 | 2021-12-03 | 福建师范大学 | Efficient and energy-saving volatile organic compound treatment equipment |
| WO2023232155A1 (en) * | 2022-05-30 | 2023-12-07 | 常州捷佳创智能装备有限公司 | Combustion apparatus and sintering device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN213930984U (en) | Efficient catalytic combustion device | |
| CN216630747U (en) | Hydrogen reactor | |
| CN214936048U (en) | Hydrogen production system | |
| KR20100006469A (en) | Fuel processor of fuel cell system | |
| CN212962199U (en) | Vertical boiler | |
| CN107537591A (en) | Three-stage carbon base catalyst regenerates Tower System | |
| CN209968110U (en) | High-efficient organic gas catalytic purification device | |
| CN102188877A (en) | High-efficiency energy-saving desorption system of industrial volatilizable organic pollutant | |
| CN206786740U (en) | A kind of box integrated organic waste gas catalytic combustion purifier | |
| CN211502822U (en) | Catalytic combustion furnace for waste gas treatment | |
| CN212006882U (en) | Hydrogen heat exchanger for hydrogen fuel cell | |
| CN216010868U (en) | Catalytic combustion furnace for purifying VOC waste gas | |
| CN201384925Y (en) | Vertical-type ventilation air methane heat counter-flow oxidization device | |
| CN110285671B (en) | Aluminum scrap smelting system | |
| CN208687750U (en) | A kind of vertical catalytic combustion device for organic waste gases | |
| CN218442323U (en) | Catalytic combustion equipment | |
| CN216244335U (en) | Compact catalytic combustion bed | |
| CN201978726U (en) | Self-heating temperature-raising type formaldehyde reactor | |
| CN213178382U (en) | RCO heat accumulating type combustion device | |
| CN219177734U (en) | Novel heat accumulation oxidation device and catalytic oxidation device | |
| CN212328323U (en) | Rotary active carbon vertical regenerating furnace | |
| CN212731706U (en) | RCO device for improving transmission efficiency | |
| CN215723270U (en) | Novel high-efficiency energy-saving catalytic combustion furnace | |
| CN215062138U (en) | Catalytic combustion all-in-one machine | |
| CN216435949U (en) | Overhead radiator thermal management system and fuel cell with hydrogen elimination device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |