CN215489718U - Low NOx gas burner that changeable load flexibility was adjusted - Google Patents
Low NOx gas burner that changeable load flexibility was adjusted Download PDFInfo
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- CN215489718U CN215489718U CN202121638715.1U CN202121638715U CN215489718U CN 215489718 U CN215489718 U CN 215489718U CN 202121638715 U CN202121638715 U CN 202121638715U CN 215489718 U CN215489718 U CN 215489718U
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- 239000003345 natural gas Substances 0.000 abstract description 11
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Abstract
The utility model discloses a low NOx gas burner with variable load flexibility regulation, which consists of an air supply pipeline, a gas supply pipeline and an igniter pipeline, wherein the air supply pipeline comprises a primary air inlet, a secondary air inlet, a primary air flow channel, a secondary air branch pipe and an air swirler; the gas supply pipeline comprises an inner ring gas inlet pipeline, an outer ring gas inlet pipeline, an inner ring gas distribution box, an outer ring gas distribution box, a central gas branch pipe, an inner ring gas branch pipe and an outer ring gas branch pipe. The utility model adopts an air classification technology, an air rotational flow technology, an air porous dispersion jet technology, a fuel gas load adjustable technology and a fuel gas porous dispersion jet technology, and solves the problems that the generation amount of nitrogen oxides in the combustion process of natural gas cannot meet the requirement of ultralow nitrogen emission and the environment is seriously polluted.
Description
Technical Field
The utility model belongs to the technical field of heat energy and power engineering, and relates to low NOxThe burner, especially a low NOx gas burner that changeable load flexibility adjusted.
Background
With the green transformation of energy structure and the proposal of carbon neutralization target, the natural gas consumption in China is increasing continuously. Although natural gas is a clean energy source, nitrogen oxides generated in the combustion process of natural gas can cause harm to the atmospheric ecological environment and the health of people. Therefore, reducing the amount of nitrogen oxides produced during the combustion of natural gas is a critical issue to be solved in the process of utilizing natural gas by combustion. Natural gas low-nitrogen combustion technology mainly surrounds how to reduce combustion temperature and thermal NOxDevelopment of (1) while considering enhanced early natural gas and air rapid homogeneous mixing to reduce rapid NOxAnd (4) generating. However, with increasingly stringent environmental standards, existing environmental requirements have not been met using only a low-nitrogen combustion technology. In order to realize low nitrogen emission of natural gas combustion, most combustor technology providers use a flue gas recirculation technology, but flue gas recirculation can increase a flue gas recirculation fan, and a large amount of flue gas flows through a hearth to improve the smoke velocity, so that the retention time of the flue gas in a furnace is shortened, and the problems of furnace temperature reduction, combustion stability reduction and the like are easily caused.
Therefore, there is a need to develop a design that meets the requirement of ultra-low nitrogen emission without flue gasRecycled novel natural gas low NOxA burner.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems that the generation amount of nitrogen oxides in the combustion process of natural gas is difficult to meet the requirement of ultralow nitrogen emission and the environment is seriously polluted, and provides a low-NOx gas burner with flexibly adjusted variable loads.
In order to achieve the purpose, the utility model adopts the following technical scheme to realize the purpose:
a low NOx gas burner with changeable load and flexibility regulation is composed of an air supply pipeline, a gas supply pipeline and an igniter pipeline, and is characterized in that the air supply pipeline comprises a primary air inlet, a secondary air inlet, a primary air flow channel, a secondary air branch pipe and an air swirler; the gas supply pipeline comprises an inner ring gas inlet pipeline, an outer ring gas inlet pipeline, an inner ring gas distribution box, an outer ring gas distribution box, a central gas branch pipe, an inner ring gas branch pipe and an outer ring gas branch pipe;
the air supply pipeline is designed in a T shape, the primary air inlet and the secondary air inlet are vertically arranged with the primary air flow channel and the secondary air flow channel, and the primary air inlet and the secondary air inlet are separated by a partition plate;
the primary air flow channel is coaxially sleeved in the secondary air flow channel, the end face of the tail end of the primary air flow channel is a primary air outlet, and the end face of the tail end of the secondary air flow channel is connected with a plurality of secondary air branch pipes;
the air swirler is coaxially sleeved in the outlet of the primary air runner, and a gap is reserved between the air swirler and the primary air runner;
the inner ring fuel gas distribution box and the outer ring fuel gas distribution box are arranged in the primary air flow channel and are separated by a partition plate;
the inlet of the inner ring gas distribution box is connected with an inner ring gas inlet pipeline, the outlet of the inner ring gas distribution box is connected with 1 central gas branch pipe and a plurality of inner ring gas branch pipes, the inner ring gas branch pipes are arranged in a circumferential array, and the central gas pipe and the inner ring gas branch pipes are sleeved in a primary air flow channel;
the outer loop gas flow distribution box inlet is connected with an outer loop gas inlet pipeline, the outlet is connected with a plurality of outer loop gas branch pipes, the outer loop gas branch pipes are arranged in a circumferential array mode, and the outer loop gas branch pipes are sleeved in a primary air flow channel.
Preferably, air volume regulating valves are arranged at the primary air inlet and the secondary air inlet, and the flow ratio of the primary air and the secondary air can be regulated according to different working conditions.
Preferably, the primary air flow channel is coaxially sleeved in the secondary air flow channel, the end face of the primary air flow channel is a primary air outlet, the end face of the secondary air flow channel is connected with a plurality of secondary air branch pipes, the secondary air branch pipes are tangentially bent by 45 degrees and have the same direction as the air swirler, the tail ends of the outlets are oblique planes, and a plurality of secondary air nozzles are arranged on the oblique planes.
Preferably, the center of the air swirler is a direct-current air channel, the outer side of the direct-current air channel is a rotational-flow air channel, and rotational-flow blades are arranged in the rotational-flow air channel.
Preferably, the inner ring gas distribution box and the outer ring gas distribution box are arranged in the primary air flow channel, the inner ring gas distribution box and the outer ring gas distribution box are separated by a partition plate, when the combustor runs at a low load, only the inner ring gas distribution box is opened, and the outer ring gas distribution box is closed, and when the combustor runs at a high load, the inner ring gas distribution box and the outer ring gas distribution box are simultaneously opened.
Preferably, the inlet of the inner ring gas distribution box is connected with an inner ring gas inlet pipeline, the outlet of the inner ring gas distribution box is connected with 1 central gas branch pipe and a plurality of inner ring gas branch pipes, the central gas branch pipes and the inner ring gas branch pipes are sleeved in the primary air flow channel, the tail ends of the central gas branch pipes extend to the center of the air swirler, the inner ring gas branch pipes are arranged in a circumferential array, and the tail ends of the inner ring gas branch pipes penetrate through a gap between the air swirler and the primary air flow channel and then are bent inwards by 90 degrees along the radial direction.
Preferably, an inlet of the outer ring fuel gas distribution box is connected with an outer ring fuel gas inlet pipeline, an outlet of the outer ring fuel gas distribution box is connected with a plurality of outer ring fuel gas branch pipes, the outer ring fuel gas branch pipes are arranged in a circumferential array mode, the outer ring fuel gas branch pipes are sleeved in the primary air flow channel, and the tail ends of the outer ring fuel gas branch pipes are bent outwards by 90 degrees along the radial direction after penetrating through a gap between the air cyclone and the primary air flow channel.
Preferably, the number of the outer ring gas branch pipes is 2 times of the number of the inner ring gas branch pipes.
Preferably, the tail end of the central gas branch pipe is hemispherical, a plurality of gas spray holes are formed in the hemispherical surface, the spray holes face to the radius direction of the hemisphere, the tail end faces of the inner ring gas branch pipe and the outer ring gas branch pipe are plugged, the gas spray holes are symmetrically formed in the side wall of the outer ring gas branch pipe and face to the tangential direction, and two rows of gas spray holes are formed in the inner ring gas branch pipe at the same side at the angle of 25 degrees and 50 degrees and are the same as the rotational flow direction of the air swirler.
Preferably, the igniter tube extends vertically through the outer wall of the burner, terminating in the center of the air swirler, and the igniter tube is used for disposing the igniter.
Compared with the prior art, the utility model has the following beneficial effects:
1. the utility model adopts air classification technology. The combustion-supporting air is divided into primary air and secondary air, the primary air inlet and the secondary air inlet are separated by a partition plate, and air volume adjusting valves are arranged at the primary air inlet and the secondary air inlet respectively and can adjust the air volume ratio of the primary air and the secondary air according to different working conditions. The primary air is fed into the combustion chamber through the primary air flow channel, so that the excess air coefficient at the initial stage of gas combustion is reduced, the gas combustion reaction speed can be slowed down, the temperature of a combustion area is reduced, and the thermal NO is inhibitedxAnd (4) generating. The overfire air is sent into the combustion chamber through a plurality of overfire air branch pipes, so that the excess air coefficient in the middle and later stages of gas combustion can be improved, the burnout rate of the gas is ensured, and the combustion efficiency of the combustor is improved.
2. The utility model adopts the air rotational flow technology. The primary air is divided into the direct current air and the rotational flow air by the air cyclone, the direct current air is high in rigidity and far in penetration distance, timely ignition and stable combustion of fuel gas can be guaranteed, the rotational flow air has large tangential momentum, and rapid mixing of the air and the fuel gas can be enhanced.
3. The utility model adopts air porous dispersion jet technology. The tail end of the secondary air branch pipe is an oblique plane, a plurality of secondary air nozzles are arranged on the oblique plane, the dispersibility of secondary air in the circumferential direction can be improved by the porous dispersion jet technology, the jet speed of the secondary air is increased, the secondary air branch pipe is tangentially bent by 45 degrees along the direction of the air swirler, the effect of entrainment of flue gas can be achieved, air turbulence is further strengthened, and local gathering of fuel gas is avoided.
4. The utility model adopts the technology of adjustable gas load. The combustor is provided with an inner ring gas shunt box and an outer ring gas shunt box, when the combustor runs at a low load, only the inner ring gas shunt box is opened, and the outer ring gas shunt box is closed, so that gas can be stably combusted at the outlet of the combustor, when the combustor runs at a high load, the inner ring gas shunt box and the outer ring gas shunt box are simultaneously opened, so that the gas can be dispersedly combusted at the outlet of the combustor, and a local high-temperature area is avoided.
5. The utility model adopts a gas porous dispersion jet technology. The gas branch pipe comprises central gas branch pipe, inner ring gas branch pipe and outer loop gas branch pipe, and central gas branch pipe end is located combustor axis position, and central gas branch pipe end is the hemisphere, is provided with a plurality of gas orifices on the hemisphere face, reaches the effect of gas dispersion burning. The tail end of the inner ring gas branch pipe penetrates through a gap between the air swirler and the primary air flow channel and then is bent inwards by 90 degrees along the radial direction, the tail end of the outer ring gas branch pipe penetrates through a gap between the air swirler and the primary air flow channel and then is bent outwards by 90 degrees along the radial direction, the tail end faces of the inner ring gas branch pipe and the outer ring gas branch pipe are plugged, gas spray holes are symmetrically formed in the side wall of the outer ring gas branch pipe, the inner ring gas branch pipe is opened at the same sides of 25 degrees and 50 degrees along the direction of the air swirler so that the gas spray holes are uniformly distributed on the outlet section of the primary air flow channel in a dispersing way, and the gas can form vertical cross jet with combustion air after being sprayed out of the spray holes. The gas porous dispersion jet technology can promote the mixing of gas and air, reduce the gas gathering area, avoid the formation of a local high-temperature area and effectively reduce NOxAnd (4) generating.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a variable load flexible regulated low NOx gas burner of the present invention;
FIG. 2 is a right side view of FIG. 1;
FIG. 3 is an overall view of FIG. 1;
FIG. 4 is a schematic view of the gas manifold of FIG. 1;
wherein: 1-a primary air inlet, 2-a secondary air inlet, 3-an air quantity regulating valve, 4-a primary air flow channel, 5-a secondary air flow channel, 6-a secondary air branch pipe, 7-an air swirler, 8-an inner ring fuel gas inlet pipeline, 9-an outer ring fuel gas inlet pipeline, 10-an inner ring fuel gas shunt box, 11-an outer ring fuel gas shunt box, 12-a center fuel gas branch pipe, 13-an inner ring fuel gas branch pipe, 14-an outer ring fuel gas branch pipe and 15-an igniter pipeline.
Detailed Description
Example (b): influencing NO in gas combustion processesxThe main factors of the generation are the combustion temperature, the residence time of the fuel in the high-temperature area and the mixing condition of the fuel and the air, and correspondingly, the low NO of the fuel gas is realizedxThe burning method comprises the steps of reducing the burning temperature of the fuel gas, strengthening the rapid mixing of the fuel gas and air, eliminating a local high-temperature area and the like.
The utility model is described in further detail below with reference to the accompanying drawings:
referring to fig. 1 to 4, the low NOx gas burner with variable load flexibility regulation according to the present invention is composed of an air supply duct, a gas supply duct, and an igniter duct 15. The air supply pipeline comprises a primary air inlet 1, a secondary air inlet 2, an air quantity regulating valve 3, a primary air flow channel 4, a secondary air flow channel 5, a secondary air branch pipe 6 and an air swirler 7; the gas supply pipeline comprises an inner ring gas inlet pipeline 8, an outer ring gas inlet pipeline 9, an inner ring gas distribution box 10, an outer ring gas distribution box 11, a central gas branch pipe 12, an inner ring gas branch pipe 13 and an outer ring gas branch pipe 14;
the connection relationship of the above components is as follows:
the primary air inlet 1 and the secondary air inlet 2 are vertically arranged with the primary air flow passage 4 and the secondary air flow passage 5, and the primary air inlet 1 and the secondary air inlet 2 are separated by a clapboard; air volume regulating valves 3 are arranged at the primary air inlet 1 and the secondary air inlet 2;
the primary air flow channel 4 is coaxially sleeved in the secondary air flow channel 5, and the end face of the tail end of the secondary air flow channel 5 is connected with a plurality of secondary air branch pipes 6; the air swirler 7 is coaxially sleeved in the outlet of the primary air flow passage 4, and a gap is reserved between the air swirler 7 and the primary air flow passage 4;
the inner ring fuel gas flow distributing box 10 and the outer ring fuel gas flow distributing box 11 are separated by a partition plate, and the inner ring fuel gas flow distributing box 10 and the outer ring fuel gas flow distributing box 11 are arranged outside the primary air flow passage 4; the inlet of the inner ring gas distribution box 10 is connected with an inner ring gas inlet pipeline 8, and the outlet is connected with a central gas branch pipe 12 and an inner ring gas branch pipe 13; the inlet of the outer ring gas distribution box 11 is connected with an outer ring gas inlet pipeline 9, and the outlet is connected with an outer ring gas branch pipe 14;
an igniter tube 15 extends vertically through the outer burner wall and terminates to the center of the air swirler 7.
The working principle of the utility model is as follows:
firstly, adopt the air to distribute the wind in grades, divide into the combustion air and once wind and overgrate air, the air inlet 1 is separated by the baffle with overgrate air entry 2, all is provided with air regulation valve 3 in air inlet 1 and overgrate air entry 2 department, can adjust the amount of wind ratio of air and overgrate air according to different work condition. The primary air is sent into the combustion chamber through the primary air flow passage 4, so that the excess air coefficient at the initial stage of gas combustion is reduced, the gas combustion reaction speed can be slowed down, the temperature of a combustion area is reduced, and the thermal NO is inhibitedxAnd (4) generating. The overfire air is sent into the combustion chamber through the plurality of overfire air branch pipes 6, so that the excess air coefficient in the middle and later stages of gas combustion can be improved, the burnout rate of the gas is ensured, and the combustion efficiency of the combustor is improved.
Secondly, the primary air is divided into direct current air and rotational flow air by the air swirler 7, the direct current air is strong in rigidity and long in penetration distance, timely ignition and stable combustion of fuel gas can be guaranteed, and the rotational flow air has large tangential momentum and can enhance rapid mixing of the air and the fuel gas.
Thirdly, the secondary air branch pipe 6 is the same as the air swirler in the direction of 45 degrees in the tangential direction, the tail end is an oblique plane, a plurality of secondary air nozzles are arranged on the oblique plane, the dispersibility of the secondary air in the circumferential direction can be improved by the porous dispersion jet flow technology, the secondary air jet flow speed is increased, the air turbulence is further strengthened, and the local gathering of fuel gas is avoided.
Fourthly, the combustor is provided with 2 gas distribution boxes. The inner ring gas flow distributing box 10 and the outer ring gas flow distributing box 11 are separated by the partition plate, when the combustor runs at a low load, only the inner ring gas flow distributing box 10 is opened, and the outer ring gas flow distributing box 11 is closed, so that the gas can be stably combusted at the outlet of the combustor, when the combustor runs at a high load, the inner ring gas flow distributing box 10 and the outer ring gas flow distributing box 11 are simultaneously opened, so that the gas can be dispersedly combusted at the outlet of the combustor, and a local high-temperature area is avoided.
Fifthly, the tail end of the central gas branch pipe 12 is located at the axis position of the burner, the tail end of the central gas branch pipe 12 is hemispherical, and a plurality of gas spray holes are formed in the hemispherical surface, so that the effect of gas dispersed combustion is achieved. The tail end of the inner ring gas branch pipe 13 penetrates through a gap between the air swirler 7 and the primary air flow passage 4 and then is bent inwards by 90 degrees along the radial direction, the tail end of the outer ring gas branch pipe 14 penetrates through a gap between the air swirler 7 and the primary air flow passage 4 and then is bent outwards by 90 degrees along the radial direction, the tail end faces of the inner ring gas branch pipe 13 and the outer ring gas branch pipe 14 are plugged, gas spray holes are symmetrically formed in the side wall of the outer ring gas branch pipe 14, the inner ring gas branch pipe 13 is opened at the same side of 25 degrees and 50 degrees along the direction of the air swirler, the gas spray holes are uniformly distributed on the outlet section of the primary air flow passage 4 in a dispersing way, gas can form vertical cross jet flow with combustion air after being sprayed from the spray holes, the mixing of the gas and the air is strengthened, a gas gathering area is reduced, the formation of a local high temperature area is avoided, and the formation of an NO (NO) area can be effectively reducedxAnd (4) generating.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the utility model as set forth in the claims.
Claims (10)
1. A low NOx gas burner with changeable load and flexibility regulation is composed of an air supply pipeline, a gas supply pipeline and an igniter pipeline, and is characterized in that the air supply pipeline comprises a primary air inlet (1), a secondary air inlet (2), a primary air flow channel (4), a secondary air flow channel (5), a secondary air branch pipe (6) and an air swirler (7); the gas supply pipeline comprises an inner ring gas inlet pipeline (8), an outer ring gas inlet pipeline (9), an inner ring gas distribution box (10), an outer ring gas distribution box (11), a central gas branch pipe (12), an inner ring gas branch pipe (13) and an outer ring gas branch pipe (14);
the primary air inlet (1) and the secondary air inlet (2) are vertically arranged with the primary air flow channel (4) and the secondary air flow channel (5), and the primary air inlet (1) and the secondary air inlet (2) are separated by a partition plate;
the primary air flow channel (4) is coaxially sleeved in the secondary air flow channel (5), the end face of the tail end of the primary air flow channel (4) is a primary air outlet, and the end face of the tail end of the secondary air flow channel (5) is connected with a plurality of secondary air branch pipes (6);
the air swirler (7) is coaxially sleeved in the outlet of the primary air flow channel (4), and a gap is reserved between the air swirler (7) and the primary air flow channel (4);
the inner ring fuel gas flow distributing box (10) and the outer ring fuel gas flow distributing box (11) are arranged in the primary air flow channel (4), and the inner ring fuel gas flow distributing box (10) and the outer ring fuel gas flow distributing box (11) are separated by a partition plate;
the inlet of the inner ring gas distribution box (10) is connected with an inner ring gas inlet pipeline (8), the outlet of the inner ring gas distribution box is connected with 1 central gas branch pipe (12) and a plurality of inner ring gas branch pipes (13), the inner ring gas branch pipes (13) are arranged in a circumferential array, and the central gas branch pipes (12) and the inner ring gas branch pipes (13) are sleeved in the primary air flow channel (4);
the outer ring gas flow distribution box (11) is connected with an outer ring gas inlet pipeline (9) at the inlet, a plurality of outer ring gas branch pipes (14) are connected at the outlet, the outer ring gas branch pipes (14) are arranged in a circumferential array mode, and the outer ring gas branch pipes (14) are sleeved and installed in the primary air flow channel (4).
2. The variable load flexibility-adjustable low-NOx gas burner according to claim 1, wherein air volume adjusting valves (3) are respectively arranged in the primary air inlet (1) and the secondary air inlet (2).
3. The variable load flexibility adjustable low NOx gas burner of claim 1, wherein the end of the secondary air branch pipe (6) is tangentially bent by 45 degrees and is in the same direction as the air swirler (7), the outlet end face is a chamfer, and a plurality of secondary air nozzles are arranged on the chamfer.
4. The variable load flexibility adjustable low NOx gas burner of claim 1, wherein the center of the air swirler (7) is a straight air channel, the outer side of the straight air channel is a rotational air channel, and rotational vanes are arranged in the rotational air channel.
5. The variable load flexibility adjustable low NOx gas burner according to claim 1, wherein the inner ring gas diversion box (10) and the outer ring gas diversion box (11) are separated by a partition plate, when the burner is in low-load operation, only the inner ring gas diversion box (10) is opened, and the outer ring gas diversion box (11) is closed; when the combustor runs at high load, the inner ring gas shunt box (10) and the outer ring gas shunt box (11) are opened simultaneously.
6. The variable load flexibility adjustable low NOx gas burner as claimed in claim 1, wherein the end of the central gas branch pipe (12) extends to the center of the air swirler (7), the end of the central gas branch pipe (12) is hemispherical, and a plurality of gas injection holes are arranged on the hemispherical surface and face the radial direction of the hemisphere.
7. The variable load flexibility-adjustable low-NOx gas burner as claimed in claim 1, wherein the tail end of the inner ring gas branch pipe (13) penetrates through a gap between the air swirler (7) and the primary air flow channel (4) and then is bent radially inwards by 90 degrees, and the tail end of the outer ring gas branch pipe (14) penetrates through a gap between the air swirler (7) and the primary air flow channel (4) and then is bent radially outwards by 90 degrees.
8. The variable load flexibility regulated low NOx gas burner of claim 1, wherein the number of outer ring gas branch pipes (14) is 2 times the number of inner ring gas branch pipes (13).
9. The variable load flexibility-adjustable low-NOx gas burner as claimed in claim 1, wherein the end faces of the inner ring gas branch pipe (13) and the outer ring gas branch pipe (14) are blocked, gas spray holes are symmetrically formed in the side wall of the outer ring gas branch pipe (14), the spray holes are oriented in a tangential direction, two rows of gas spray holes are formed in the inner ring gas branch pipe (13) at 25 degrees and 50 degrees on the same side, and the spray holes are oriented in the same direction as the swirling direction of the air swirler (7).
10. The variable load flexibility regulated low NOx gas burner of claim 1, wherein the igniter tube (15) extends vertically through the outer wall of the burner and terminates at the center of the air swirler (7) and an igniter is disposed within the igniter tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121638715.1U CN215489718U (en) | 2021-07-19 | 2021-07-19 | Low NOx gas burner that changeable load flexibility was adjusted |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121638715.1U CN215489718U (en) | 2021-07-19 | 2021-07-19 | Low NOx gas burner that changeable load flexibility was adjusted |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215489718U true CN215489718U (en) | 2022-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121638715.1U Active CN215489718U (en) | 2021-07-19 | 2021-07-19 | Low NOx gas burner that changeable load flexibility was adjusted |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215489718U (en) |
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2021
- 2021-07-19 CN CN202121638715.1U patent/CN215489718U/en active Active
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Address after: 1216, danionggang Road, Jianggan District, Hangzhou City, Zhejiang Province, 310021 Patentee after: Xizi clean energy equipment manufacturing Co.,Ltd. Address before: 1216, danionggang Road, Jianggan District, Hangzhou City, Zhejiang Province, 310021 Patentee before: HANGZHOU BOILER GROUP Co.,Ltd. |