CN219014325U - Automatic control system for air pressure of incinerator - Google Patents
Automatic control system for air pressure of incinerator Download PDFInfo
- Publication number
- CN219014325U CN219014325U CN202223377796.1U CN202223377796U CN219014325U CN 219014325 U CN219014325 U CN 219014325U CN 202223377796 U CN202223377796 U CN 202223377796U CN 219014325 U CN219014325 U CN 219014325U
- Authority
- CN
- China
- Prior art keywords
- exhaust gas
- incinerator
- furnace shell
- fan
- heat exchange
- 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 discloses an automatic control system for the wind pressure of an incinerator, which comprises the incinerator and an exhaust gas collecting box, wherein a plurality of suction pipelines for providing negative pressure for a sizing machine are connected to the exhaust gas collecting box, and the outlet end of the exhaust gas collecting box is in butt joint with the inlet end of an exhaust gas suction fan through the pipelines; the inlet end of the exhaust gas pumping fan is also provided with a pressure sensor for detecting the internal air pressure of the pipeline, and the outlet end of the exhaust gas pumping fan is in butt joint with the exhaust gas inlet end of the incinerator through the pipeline; the negative pressure sensor is arranged in the hearth of the incinerator, and the flue gas outlet end of the incinerator is in butt joint with the inlet end of the smoke exhaust fan. The utility model does not need to manually adjust the frequency of the fan, can automatically control and adjust the rotating speed of the fan, can greatly reduce the energy waste caused by large variation of human factors, saves labor and time, and is beneficial to ensuring the stable quality of products.
Description
Technical Field
The utility model relates to the technical field of gum dipping waste gas treatment, in particular to an automatic control system for air pressure of an incinerator.
Background
When the gluing machine is used for gluing, part of components in the glue can volatilize into the air to form organic waste gas, so that the organic waste gas has a certain harm to the body of workers and the environment, and the organic waste gas is required to be collected and then sent into an incinerator for incineration according to the environmental protection requirement. The organic waste gas incinerator used at present generally comprises an incinerator body, an air supply fan, an air exhaust fan and a burner, wherein the air supply fan is connected with an air supply pipeline of the incinerator body, the air exhaust fan is connected with an exhaust pipeline of the incinerator body, and an air gun fire pipe of the burner is inserted into a hearth of the incinerator body.
Such as: the Chinese patent (issued publication number: CN 215570502U, issued publication day: 2022.01.18) discloses an organic waste gas incinerator of a glass fiber cloth gluing machine, which avoids a severe high-temperature environment in a hearth, does not detect negative pressure in the hearth and detects the state of an exhaust fan, but detects the temperature of a fire tube of a wind gun through a temperature sensor, so that the service life of the temperature sensor can be prolonged, an air supply fan can be stopped rapidly, long-time positive pressure in the hearth is avoided, and economic loss is reduced.
However, in the actual use process, when a certain gluing machine needs to produce different technological products, the air exhaust quantity is often required to be increased or reduced, and when the air exhaust quantity of the gluing machine is changed, if the rotating speed of the exhaust gas pumping fan is not adjusted, the exhaust gas can be not exhausted and enter the working environment, and the gluing quantity of the products can be influenced due to too fast pumping; in addition, after the exhaust amount of the gluing machine changes, the internal pressure of the hearth can also change, and the control and adjustment are only carried out by taking the temperature of the air gun fire tube as a standard, so that obviously, the production and use requirements cannot be met. At this time, the frequencies of the exhaust gas blower and the smoke exhaust blower need to be manually adjusted, and because the variation of human factors is relatively large, the optimal parameters of the blower operation are difficult to find, the energy waste is often caused, and the product quality is possibly unstable.
Disclosure of Invention
The utility model aims to provide an automatic control system for the air pressure of an incinerator, which aims to solve the problems in the background technology.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
the automatic control system for the wind pressure of the incinerator comprises the incinerator and an exhaust gas collecting box, wherein a plurality of suction pipelines for providing negative pressure for a sizing machine are connected to the exhaust gas collecting box, and an outlet end on the exhaust gas collecting box is in butt joint with an inlet end of an exhaust gas suction fan through a pipeline;
the inlet end of the exhaust gas pumping fan is also provided with a pressure sensor for detecting the internal air pressure of the pipeline, and the outlet end of the exhaust gas pumping fan is in butt joint with the exhaust gas inlet end of the incinerator through the pipeline;
the negative pressure sensor is arranged in the hearth of the incinerator, and the flue gas outlet end of the incinerator is in butt joint with the inlet end of the smoke exhaust fan.
Preferably, the pressure sensor and the negative pressure sensor are electrically connected with the signal input end of the controller, and the controller is also electrically connected with the exhaust gas blower and the smoke exhaust blower through corresponding frequency converters respectively.
Preferably, an electromagnetic flow regulating valve is also arranged on the suction pipeline.
Preferably, the incinerator comprises an inner furnace shell and a heat exchange shell, wherein the right end of the inner furnace shell is provided with a smoke discharge pipe for being in butt joint with the inlet end of the smoke exhaust fan, and an end annular plate is fixedly arranged on the circumferential outer wall of the inner furnace shell, which is close to the smoke discharge pipe;
the right end opening of the heat exchange shell is fixedly connected with an end annular plate, a spiral guide plate is fixedly connected between the heat exchange shell and the inner furnace shell, a spiral heat exchange cavity is formed among the heat exchange shell, the inner furnace shell and the spiral guide plate, and an exhaust gas inlet pipe communicated with the spiral heat exchange cavity is arranged on the outer wall of the right end of the heat exchange shell and is in butt joint with the outlet end of the exhaust gas pumping fan through a pipeline;
the left end of the inner furnace shell is provided with a furnace shell waste gas inlet which is communicated with the spiral heat exchange cavity. The spiral heat exchange cavity is formed by the heat exchange shell, the inner furnace shell and the spiral guide plate, and waste gas discharged by the waste gas collecting box can exchange heat with the inner furnace shell in the spiral heat exchange cavity, so that the waste gas can be preheated.
Preferably, a lower partition plate and an upper partition plate are fixedly arranged on the inner wall of the inner furnace shell near the waste gas inlet of the furnace shell, a flow guide port is reserved between the upper end of the lower partition plate and the inner furnace shell, and a flow guide port is reserved between the lower end of the upper partition plate and the inner furnace shell. The lower partition plate and the upper partition plate are reasonable in structural arrangement, and can effectively guide the flow path of the waste gas, so that the waste gas can enter from the bottom of the hearth.
Preferably, an outlet baffle plate is fixedly arranged on the inner wall of the inner furnace shell close to the smoke discharge pipe, a guide port is reserved between the upper end of the outlet baffle plate and the inner furnace shell, and a hearth is formed between the outlet baffle plate and the upper baffle plate. The burnt flue gas is guided by the outlet partition board, and the flue gas can preheat the waste gas in the initial section of the spiral heat exchange cavity.
Preferably, a combustion head is arranged in the inner furnace shell, the combustion head is positioned in the hearth, the combustion head is in butt joint with a mixed gas pipeline, and the mixed gas pipeline penetrates out of the circumferential outer wall of the heat exchange shell.
Compared with the prior art, the utility model has the beneficial effects that: the system has reasonable structural design, and the controller can collect signals of the pressure sensor, signals of the negative pressure sensor, the rotating speed of the exhaust gas pumping fan and the rotating speed of the smoke exhaust fan, and output the signals to the frequency converters of the exhaust gas pumping fan and the smoke exhaust fan respectively after calculation, so that the rotating speeds of the exhaust gas pumping fan and the smoke exhaust fan are controlled and regulated respectively, and constant air pressure inside a hearth and at the outlet of the exhaust gas collecting box is ensured.
The utility model does not need to manually adjust the frequency of the fan, can automatically control and adjust the rotating speed of the fan, can greatly reduce the energy waste caused by large variation of human factors, saves labor and time, and is beneficial to ensuring the stable quality of products.
Drawings
FIG. 1 is a schematic diagram of an automatic control system for the wind pressure of an incinerator;
FIG. 2 is a schematic cross-sectional view of an incinerator in an automatic control system of the air pressure of the incinerator;
FIG. 3 is a schematic perspective view of an incinerator in an automatic control system of the air pressure of the incinerator;
FIG. 4 is a schematic perspective view showing an expanded incinerator in the automatic control system of the wind pressure of the incinerator;
fig. 5 is a schematic diagram of a circuit module of an automatic control system for the wind pressure of the incinerator.
In the figure: the device comprises a 1-incinerator, a 11-heat exchange shell, a 12-waste gas inlet pipe, a 13-smoke discharge pipe, a 14-mixed gas pipeline, a 15-inner furnace shell, a 151-furnace shell waste gas inlet, a 152-lower partition plate, a 153-upper partition plate, a 154-outlet partition plate, a 16-end annular plate, a 17-spiral guide plate, a 18-supporting underframe, a 2-waste gas collecting box, a 3-pressure sensor, a 4-waste gas exhausting fan, a 5-smoke exhausting fan, a 6-negative pressure sensor, a 7-exhaust chimney, an 8-electromagnetic flow regulating valve and a 9-suction pipeline.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1 to 5, the present utility model provides a technical solution: the automatic control system of the air pressure of the incinerator comprises the incinerator 1 and an exhaust gas collecting box 2, wherein a plurality of suction pipelines 9 for providing negative pressure for a sizing machine are connected to the exhaust gas collecting box 2, and an outlet end on the exhaust gas collecting box 2 is in butt joint with an inlet end of an exhaust gas pumping fan 4 through a pipeline; the inlet end of the exhaust gas pumping fan 4 is also provided with a pressure sensor 3 for detecting the internal air pressure of the pipeline, and the outlet end of the exhaust gas pumping fan 4 is in butt joint with the exhaust gas inlet end of the incinerator 1 through the pipeline; a negative pressure sensor 6 is arranged in the hearth of the incinerator 1, the smoke outlet end of the incinerator 1 is in butt joint with the inlet end of a smoke exhaust fan 5, and the outlet end of the smoke exhaust fan 5 is communicated with a smoke exhaust chimney 7 through a pipeline.
The pressure sensor 3 and the negative pressure sensor 6 are electrically connected with the signal input end of the controller, the controller is also electrically connected with the exhaust gas blower 4 and the exhaust gas blower 5 through corresponding frequency converters respectively, and the controller shell can specifically adopt a PLC controller in the prior art.
In a specific application, the electromagnetic flow regulating valve 8 can also be arranged on the suction pipeline 9. In this embodiment, the suction pipes 9 are specifically provided with three suction pipes corresponding to the 1# gluing machine, the 2# gluing machine and the 3# gluing machine, respectively.
The working principle of the utility model is as follows: if the No. 1 gluing machine is used for producing different technological products, the air discharge quantity is required to be increased or reduced, and a worker can adjust the air flow quantity by controlling the electromagnetic flow quantity adjusting valve 8, so that the purpose of increasing or reducing the air discharge quantity is realized. After the exhaust amount of the No. 1 gluing machine is changed, the exhaust amount at the outlet end of the exhaust gas collecting box 2 is also changed, when the pressure sensor 3 detects that the inlet pressure of the exhaust gas pumping fan 4 is changed, the pressure sensor 3 transmits a pressure signal to the PLC controller, the PLC controller transmits the signal to a frequency converter corresponding to the exhaust gas pumping fan 4 after calculation, the frequency converter controls and adjusts the exhaust gas pumping fan 4, the rotating speed of the exhaust gas pumping fan 4 is automatically adjusted, and the inlet of the exhaust gas pumping fan 4 is ensured to keep constant negative pressure;
after the rotating speed of the exhaust gas blower 4 is changed, the internal pressure of the hearth is also changed, the negative pressure sensor 6 transmits a changed pressure signal to the PLC controller, the PLC controller transmits the signal to a frequency converter corresponding to the exhaust gas blower 5 after calculation, and the frequency converter controls and adjusts the exhaust gas blower 5 and automatically adjusts the rotating speed of the exhaust gas blower 5, so that the internal constant negative pressure of the hearth is ensured;
when the furnace burns waste gas of different concentrations, the temperature of the furnace has different changes, and under different temperatures, the inside wind pressure of furnace also can change, and negative pressure sensor 6 gives the PLC controller with the pressure signal who changes, and the PLC controller passes through the back of calculation, gives the converter that smoke ventilator 5 corresponds with the signal transmission, and this converter is controlled and is adjusted smoke ventilator 5, carries out automatic adjustment to smoke ventilator 5's rotational speed to guarantee that furnace's inside keeps invariable negative pressure.
The system has reasonable structural design, waste gas generated in the production process of the gluing machine is pumped into a hearth of the incinerator 1 by the waste gas pumping fan 4 for combustion, the pressure sensor 3 is arranged at the inlet end of the waste gas pumping fan 4, the negative pressure sensor 6 is arranged in the hearth, and the combusted smoke is discharged by the smoke exhaust fan 5 after heat is utilized. The PLC can collect signals of the pressure sensor 3, signals of the negative pressure sensor 6, the rotating speed of the exhaust gas blower 4 and the rotating speed of the smoke exhaust blower 5, and output the signals to the frequency converters of the exhaust gas blower 4 and the smoke exhaust blower 5 after calculation, so that the rotating speeds of the exhaust gas blower 4 and the smoke exhaust blower 5 are controlled and regulated respectively, and constant air pressure inside a hearth and at the outlet of the exhaust gas collecting box 2 is ensured. The utility model does not need to manually adjust the frequency of the fan, can automatically control and adjust the rotating speed of the fan, can greatly reduce the energy waste caused by large variation of human factors, saves labor and time, and is beneficial to ensuring the stable quality of products.
As a specific scheme, the incinerator 1 can specifically comprise an inner furnace shell 15 and a heat exchange shell 11, a supporting underframe 18 can be fixedly connected to the bottom of the inner furnace shell 15, a smoke discharge pipe 13 for being in butt joint with the inlet end of the smoke exhaust fan 5 is arranged at the right end of the inner furnace shell 15, and an end annular plate 16 is fixedly arranged on the circumferential outer wall of the inner furnace shell 15, which is close to the smoke discharge pipe 13;
the right end opening of the heat exchange shell 11 is fixedly connected with an end annular plate 16, a spiral guide plate 17 is fixedly connected between the heat exchange shell 11 and the inner furnace shell 15, a spiral heat exchange cavity is formed among the heat exchange shell 11, the inner furnace shell 15 and the spiral guide plate 17, an exhaust gas inlet pipe 12 communicated with the spiral heat exchange cavity is arranged on the outer wall of the right end of the heat exchange shell 11, and the exhaust gas inlet pipe 12 is in butt joint with the outlet end of the exhaust gas pumping fan 5 through a pipeline;
the left end of the inner furnace shell 15 is provided with a furnace shell waste gas inlet 151 for communicating with the spiral heat exchange cavity.
The structural design of the incinerator 1 is reasonable, a spiral heat exchange cavity is formed through the heat exchange shell 11, the inner furnace shell 15 and the spiral guide plate 17, exhaust gas discharged from the exhaust gas collecting box 2 can exchange heat with the inner furnace shell 15 in the spiral heat exchange cavity, the exhaust gas can be preheated, the exhaust gas can be fully burnt after entering the inner furnace shell 15, and good exhaust gas treatment effect is guaranteed.
Wherein, the inner wall of the inner furnace shell 15 is fixedly provided with a lower baffle plate 152 and an upper baffle plate 153 near the furnace shell waste gas inlet 151, a flow guide port is reserved between the upper end of the lower baffle plate 152 and the inner furnace shell 15, and a flow guide port is reserved between the lower end of the upper baffle plate 153 and the inner furnace shell 15. The lower partition 152 and the upper partition 153 are arranged reasonably, and can effectively guide the flow path of the exhaust gas, so that the exhaust gas can enter from the bottom of the hearth, and the exhaust gas can be fully burnt later.
An outlet baffle plate 154 is fixedly arranged on the inner wall of the inner furnace shell 15 near the flue gas discharge pipe 13, a diversion port is reserved between the upper end of the outlet baffle plate 154 and the inner furnace shell 15, and a hearth is formed between the outlet baffle plate 154 and the upper baffle plate 153. The burned flue gas is guided by the outlet partition 154, and the flue gas can preheat the waste gas in the initial section of the spiral heat exchange cavity.
As a specific solution, a combustion head 155 can be installed in the inner furnace shell 15, the combustion head 155 is located in the furnace, and the combustion head 155 is in butt joint with the gas mixture pipe 14, and the gas mixture pipe 14 passes through the circumferential outer wall of the heat exchange shell 11. The mixed combustion gas is supplied through the gas mixture pipe 14, and is injected and burned at the combustion head 155.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (7)
1. The utility model provides an incinerator wind pressure automatic control system, includes incinerator (1) and waste gas collection box (2), its characterized in that: the exhaust gas collecting box (2) is connected with a plurality of suction pipelines (9) for providing negative pressure for the gluing machine, and the outlet end of the exhaust gas collecting box (2) is in butt joint with the inlet end of the exhaust gas pumping fan (4) through the pipelines;
the inlet end of the exhaust gas pumping fan (4) is also provided with a pressure sensor (3) for detecting the internal air pressure of the pipeline, and the outlet end of the exhaust gas pumping fan (4) is in butt joint with the exhaust gas inlet end of the incinerator (1) through the pipeline;
a negative pressure sensor (6) is arranged in a hearth of the incinerator (1), and a flue gas outlet end of the incinerator (1) is in butt joint with an inlet end of a flue gas exhaust fan (5).
2. The automatic control system for air pressure of an incinerator according to claim 1, wherein: the pressure sensor (3) and the negative pressure sensor (6) are electrically connected with the signal input end of the controller, and the controller is also electrically connected with the exhaust gas pumping fan (4) and the exhaust gas pumping fan (5) through corresponding frequency converters respectively.
3. The automatic control system for wind pressure of incinerator according to claim 2, wherein: an electromagnetic flow regulating valve (8) is also arranged on the suction pipeline (9).
4. The automatic control system for air pressure of an incinerator according to claim 1, wherein: the incinerator (1) comprises an inner furnace shell (15) and a heat exchange shell (11), a smoke discharge pipe (13) for being in butt joint with the inlet end of a smoke exhaust fan (5) is arranged at the right end of the inner furnace shell (15), and an end annular plate (16) is fixedly arranged on the circumferential outer wall of the inner furnace shell (15) close to the smoke discharge pipe (13);
the right end opening of the heat exchange shell (11) is fixedly connected with an end annular plate (16), a spiral guide plate (17) is fixedly connected between the heat exchange shell (11) and the inner furnace shell (15), a spiral heat exchange cavity is formed among the heat exchange shell (11), the inner furnace shell (15) and the spiral guide plate (17), an exhaust gas inlet pipe (12) communicated with the spiral heat exchange cavity is arranged on the outer wall of the right end of the heat exchange shell (11), and the exhaust gas inlet pipe (12) is in butt joint with the outlet end of the exhaust gas pumping fan (5) through a pipeline;
the left end of the inner furnace shell (15) is provided with a furnace shell waste gas inlet (151) which is used for being communicated with the spiral heat exchange cavity.
5. The automatic control system for air pressure of incinerator according to claim 4, wherein: the inner wall of the inner furnace shell (15) is fixedly provided with a lower partition plate (152) and an upper partition plate (153) close to the furnace shell waste gas inlet (151), a flow guide port is reserved between the upper end of the lower partition plate (152) and the inner furnace shell (15), and a flow guide port is reserved between the lower end of the upper partition plate (153) and the inner furnace shell (15).
6. The automatic control system for air pressure of an incinerator according to claim 5, wherein: an outlet partition plate (154) is fixedly arranged on the inner wall of the inner furnace shell (15) close to the smoke discharge pipe (13), a guide port is reserved between the upper end of the outlet partition plate (154) and the inner furnace shell (15), and a hearth is formed between the outlet partition plate (154) and the upper partition plate (153).
7. The automatic control system for air pressure of incinerator according to claim 6, wherein: the combustion head (155) is arranged in the inner furnace shell (15), the combustion head (155) is positioned in the hearth, the combustion head (155) is in butt joint with the gas mixing pipeline (14), and the gas mixing pipeline (14) penetrates out of the circumferential outer wall of the heat exchange shell (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223377796.1U CN219014325U (en) | 2022-12-15 | 2022-12-15 | Automatic control system for air pressure of incinerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223377796.1U CN219014325U (en) | 2022-12-15 | 2022-12-15 | Automatic control system for air pressure of incinerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219014325U true CN219014325U (en) | 2023-05-12 |
Family
ID=86246253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223377796.1U Active CN219014325U (en) | 2022-12-15 | 2022-12-15 | Automatic control system for air pressure of incinerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219014325U (en) |
-
2022
- 2022-12-15 CN CN202223377796.1U patent/CN219014325U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107620962B (en) | A kind of biogas low NO | |
| CN110425522A (en) | Environmentally friendly low nitrogen burning heat-exchanger rig and its method for controlling combustion | |
| CN105910115B (en) | A kind of incinerator for waste liquid | |
| CN102042602B (en) | Processing method and device for incinerating toxic waste liquid by smoke concentration and gasification | |
| CN207649091U (en) | A kind of direct-fired gas type hot-blast stove | |
| CN219014325U (en) | Automatic control system for air pressure of incinerator | |
| CN207527571U (en) | A kind of natural gas boiler low nitrogen burning system | |
| CN108443876A (en) | Burn low NO, boiler and its application method with it on water-cooled surface | |
| CN207334775U (en) | Biological mass gas burnnig boiler flue gas emission oxygen content monitors Analysis Control Unit | |
| CN203454139U (en) | Burner with automatic air volume control function | |
| CN110107888A (en) | A kind of uniform distribution biomass fuel combustion equipment and its combustion method | |
| CN216716797U (en) | Drying room for directly heating Cantonese sausage by utilizing clean flue gas of hot blast stove | |
| CN209876904U (en) | Boiler low-temperature flue gas recirculation combustion system | |
| CN209399368U (en) | The low nitrogen gas burner of L-type | |
| CN108443869B (en) | A kind of hybrid low NO of flue gas, boiler and its application method with it | |
| CN109827169B (en) | Boiler low-temperature flue gas recirculation combustion system and application method thereof | |
| CN208687749U (en) | A kind of flue gas processing device for coal-burning boiler | |
| CN207999808U (en) | A kind of band axial direction adjustable vane prevents the device of burner nozzle slagging | |
| CN209229759U (en) | A kind of high-purity is given up ammonia incinerator and incineration system | |
| CN208349579U (en) | A kind of high efficient heat exchanging formula premixes boiler entirely | |
| CN208124253U (en) | A kind of double-hearth type HRSG with Supplementary Firing | |
| CN112113214A (en) | Low-nitrogen combustor with adjustable injection amount | |
| CN206160446U (en) | Strong drum -type gas heater | |
| CN215001706U (en) | Pot movable air draft air supply device of integrated kitchen of faggots | |
| CN205919317U (en) | Coal fired boiler coal pulverizer gas recirculation system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |