CN109812813B - Combustion chamber for incinerating garbage, garbage incineration boiler and working method of combustion chamber - Google Patents
Combustion chamber for incinerating garbage, garbage incineration boiler and working method of combustion chamber Download PDFInfo
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Abstract
The invention relates to a combustion chamber for incinerating garbage, a garbage incineration boiler and a working method thereof, belonging to a garbage incineration device and a working method thereof. The invention provides a combustion chamber and a waste incineration boiler which can prevent a superheater from being corroded and have high reliability and high incineration efficiency and a working method thereof. In the invention, the combustion chamber is formed by bonding a phase change energy storage refractory brick, mortar and an outer wall from inside to outside; the heat exchange tube is arranged at the joint of the outer wall and mortar, the combustion chamber is divided into an upper part and a lower part, the evaporation heating surface of the hearth is positioned at the upper part of the combustion chamber, the secondary superheater is positioned at the lower part of the combustion chamber, and the first evaporation heating surface, the primary superheater, the second evaporation heating surface and the economizer are arranged in the flue gas channel from top to bottom; the boiler barrel is respectively connected with the hearth evaporation heating surface, the first evaporation heating surface, the second evaporation heating surface, the primary superheater, the secondary superheater, the steam turbine, the condenser, the degassing device and the economizer. The invention is mainly used for burning garbage.
Description
Technical Field
The invention belongs to a garbage incineration device and a working method thereof, and particularly relates to a combustion chamber and a garbage incineration boiler for incinerating garbage and a working method thereof.
Background
The steam parameters adopted by the existing common waste incineration boiler generally mainly adopt the medium-temperature and medium-pressure working condition (4.0MPa, 400 ℃), which is caused by the fuel characteristics of the waste incineration boiler; at present, the adopted measures are mainly to add anti-corrosion materials on the surface of the superheater, but the method can reduce the reliability of the superheater and needs to increase the overhaul time, and the most important point is to improve the steam parameters of the outlet of the waste incineration boiler as much as possible. In addition, because the proportion of combustible materials in the garbage is uneven, fuel in the hearth is burnt unevenly, the temperature is unstable, and a heat exchange device (such as a water wall) in the hearth works unstably, so that the generation of steam fluctuates. The heat absorption assembly in the traditional waste incineration boiler mainly comprises a heat exchange tube, a superheater, an economizer and the like, but the traditional structure and arrangement mode are not beneficial to the improvement of steam parameters.
Therefore, there is a need for a combustion chamber and a waste incineration boiler, which can prevent corrosion of a superheater, have high reliability, and have high incineration efficiency, and a method of operating the same.
Disclosure of Invention
The invention provides a combustion chamber, a waste incineration boiler and a working method thereof, which can prevent a superheater from being corroded and have high reliability and high incineration efficiency, aiming at the defects of easy corrosion, low reliability and low incineration efficiency of the existing boiler combustion chamber superheater.
The invention relates to a combustion chamber and a waste incineration boiler for incinerating waste and a working method thereof, and the technical scheme is as follows:
the invention relates to a combustion chamber for incinerating garbage, which is formed by bonding a phase-change energy-storage refractory brick, mortar and an outer wall from inside to outside; the heat exchange tube is horizontally arranged at the joint of the outer wall and the mortar, the mortar is used for bonding the phase change energy storage refractory brick, the heat exchange tube and the outer wall together, a plurality of deep holes are formed in the phase change energy storage refractory brick, phase change materials are filled in the deep holes, and the phase change energy storage refractory brick is made of ceramic materials.
Further: the phase-change material is metal aluminum, aluminum-silicon mixture, aluminum-silicon-copper mixture, aluminum-silicon-magnesium mixture, aluminum-silicon-zinc mixture or aluminum-magnesium-zinc mixture.
A waste incineration boiler based on the combustion chamber comprises the combustion chamber, a boiler barrel, a first evaporation heating surface, a first-stage superheater, a second evaporation heating surface, an economizer, a degassing device, a condenser, a steam turbine, a flue gas channel and a hearth; the combustion chamber is positioned below the hearth and is divided into an upper part and a lower part, the heat exchange tubes in the upper outer wall form an evaporation heating surface of the hearth, and the heat exchange tubes in the lower outer wall form a secondary superheater; the first evaporation heating surface, the primary superheater, the second evaporation heating surface and the economizer are arranged in the flue gas channel from top to bottom; the boiler barrel is provided with a first water outlet, a first water inlet, a second water outlet, a second water inlet, a steam outlet and a third water inlet, one end of a hearth evaporation heating surface is communicated with the first water outlet, the other end of the hearth evaporation heating surface is communicated with the first water inlet, one ends of the first evaporation heating surface and the second evaporation heating surface are simultaneously communicated with the second water outlet, the other ends of the first evaporation heating surface and the second evaporation heating surface are simultaneously communicated with the second water inlet, the steam outlet is sequentially communicated with a primary superheater, a secondary superheater, a steam turbine, a condenser, a degassing device and an economizer, and the economizer is communicated with the third water inlet.
Further: the water pump set comprises a first water pump, a second water pump and a third water pump; the second water pump is arranged between the evaporation heating surface of the hearth and the second water inlet, the first water pump is arranged between the first evaporation heating surface and the second water inlet, and the third water pump is arranged between the economizer and the degassing device.
According to the working method of the waste incineration boiler, waste is placed in a combustion chamber to be ignited, and high-temperature radiation generated by combustion exchanges heat with phase change energy storage refractory bricks on the inner side of the combustion chamber, so that heat exchange is performed with a secondary superheater and a hearth evaporation heating surface; the flue gas generated during combustion is discharged out of the flue gas channel after heat exchange is carried out in the flue gas channel; water is filled in a boiler barrel above the combustion chamber, and the water in the boiler barrel exchanges heat with the furnace through two water circulation pipelines to form saturated water and saturated steam which flows back to the boiler barrel; the saturated steam forms superheated steam through a steam circulating pipeline, drives a steam turbine to generate power, condenses into water and then flows back to the boiler barrel.
Further: and the flue gas flows through the first evaporation heating surface, the first-stage superheater, the second evaporation heating surface and the economizer in the flue gas pipeline in sequence and then is discharged out of the boiler.
Further: the two water circulating pipelines are respectively a first water circulating pipeline and a second water circulating pipeline; in the first water circulation pipeline, water in the boiler barrel flows out from the first water outlet, and flows back to the boiler barrel from the first water inlet through the second water pump after passing through the heat exchange pipe of the hearth evaporation heating surface; in the second water circulation pipeline, water in the boiler barrel flows out from the second water outlet, passes through the first evaporation heating surface and the second evaporation heating surface respectively, passes through the first water pump and flows back to the boiler barrel from the second water inlet.
Further: the steam pipeline is characterized in that steam flows out from a steam outlet, sequentially passes through a primary superheater, a secondary superheater, a steam turbine and a condenser, is condensed into water, sequentially flows through a degassing device, a third water pump and an economizer, reaches a third water inlet and flows back to the boiler barrel.
The invention relates to a combustion chamber and a waste incineration boiler for incinerating waste and a working method thereof, which have the beneficial effects that:
the invention relates to a combustion chamber and a waste incineration boiler for incinerating waste and a working method thereof, which can improve steam parameters to 9.0MPa and 600 ℃ based on the combustion chamber structure of a high-temperature phase-change energy-storage refractory brick; show the efficiency that improves msw incineration boiler, prevent that the over heater from being corroded, guarantee the stability of the reliability of over heater and steam output to promote the steam parameter.
Drawings
FIG. 1 is a schematic structural view of a boiler combustion chamber wall;
FIG. 2 is a schematic structural view of a refractory brick;
FIG. 3 is a sectional view taken along line A-A of FIG. 2;
FIG. 4 is a schematic structural view of a boiler;
in the figure: the heat exchanger comprises a ceramic material 1, a phase change material 2, refractory bricks 3, mortar 4, heat exchange tubes 5, an outer wall 6, a boiler barrel 7, a hearth evaporation heating surface 9, a secondary superheater 10, a combustion chamber 11, a first evaporation heating surface 12, a first superheater 13, a second evaporation heating surface 14, an economizer 15, a degasser 16, a condenser 17, a steam turbine 18, a flue gas channel 19, a hearth 20, a first water outlet 7-1, a first water inlet 7-2, a second water outlet 7-3, a second water inlet 7-4, a steam outlet 7-5, a third water inlet 7-6, a first water pump 8-1, a second water pump 8-2 and a third water pump 8-3.
Detailed Description
The technical solutions of the present invention are further described below with reference to the following examples, but the present invention is not limited thereto, and any modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Example 1
The embodiment is described with reference to fig. 1, in the embodiment, the combustion chamber for incinerating garbage is formed by bonding a phase change energy storage refractory brick 3, mortar 4 and an outer wall 6 from inside to outside; the heat exchange tube 5 is horizontally arranged at the joint of the outer wall 6 and the mortar 4, the mortar 4 is used for bonding the phase change energy storage refractory brick 3, the heat exchange tube 5 and the outer wall 6 together, a plurality of deep holes are formed in the phase change energy storage refractory brick 3, the deep holes are filled with phase change materials 2, and the phase change energy storage refractory brick 3 is made of ceramic materials 1.
More specifically: the phase-change material 2 is metal aluminum, aluminum-silicon mixture, aluminum-silicon-copper mixture, aluminum-silicon-magnesium mixture, aluminum-silicon-zinc mixture or aluminum-magnesium-zinc mixture, etc.
A waste incineration boiler based on the combustion chamber comprises a combustion chamber 11, a boiler barrel 7, a first evaporation heating surface 12, a first-stage superheater 13, a second evaporation heating surface 14, an economizer 15, a degassing device 16, a condenser 17, a steam turbine 18, a flue gas channel 19 and a hearth 20; the combustion chamber 11 is positioned below the hearth 20 and is divided into an upper part and a lower part, the heat exchange tubes 5 in the upper outer wall 6 form a hearth evaporation heating surface 9, and the heat exchange tubes 5 in the lower outer wall 6 form a secondary superheater 10; the hearth 20 is communicated with the flue gas channel 19, and the first evaporation heating surface 12, the primary superheater 13, the second evaporation heating surface 14 and the economizer 15 are arranged in the flue gas channel 19 from top to bottom; the boiler barrel 7 is provided with a first water outlet 7-1, a first water inlet 7-2, a second water outlet 7-3, a second water inlet 7-4, a steam outlet 7-5 and a third water inlet 7-6, one end of a hearth evaporation heating surface 9 is communicated with the first water outlet 7-1, the other end of the hearth evaporation heating surface 9 is communicated with the first water inlet 7-2, one ends of a first evaporation heating surface 12 and a second evaporation heating surface 14 are simultaneously communicated with the second water outlet 7-3, the other ends of the first evaporation heating surface and the second evaporation heating surface are simultaneously communicated with the second water inlet 7-4, the steam outlet 7-5 is sequentially communicated with a first-stage superheater 13, a second-stage superheater 10, a steam turbine 18, a condenser 17, a degassing device 16 and an economizer 15, and the economizer 15 is communicated with the third water inlet 7-6.
The working method based on the waste incineration boiler is characterized in that pretreated waste is combusted in a combustion chamber, and mainly exchanges heat with refractory bricks on an inner wall in a radiation heat exchange mode so as to heat exchange tubes in the wall in a heat conduction mode, high-temperature radiation generated during combustion exchanges heat with phase-change energy storage refractory bricks 3 on the inner side of the combustion chamber 11, and then exchanges heat with a secondary superheater 10 and a hearth evaporation heating surface 9; exchanging heat with each heat exchange component, and finally discharging exhaust gas out of the flue gas channel 19; water is filled in the boiler barrel 7 above the combustion chamber 10, and the water in the boiler barrel 7 exchanges heat with the furnace through two water circulation pipelines to form saturated water and saturated steam which flows back to the boiler barrel; the saturated steam forms superheated steam through a steam circulating pipeline, drives the steam turbine 18 to generate power, condenses into water and then flows back to the boiler barrel 7.
More specifically: the high-temperature flue gas flows through the first evaporation heating surface 12, the first-stage superheater 13, the second evaporation heating surface 14 and the economizer 15 in sequence in the flue gas channel 19 and then is discharged out of the boiler.
More specifically: the two water circulating pipelines are respectively a first water circulating pipeline and a second water circulating pipeline; in the first water circulation pipeline, water in the boiler barrel 7 flows out from the first water outlet 7-1, passes through a heat exchange pipe of the hearth evaporation heating surface 9, passes through the second water pump 8-2 and flows back to the boiler barrel 7 from the first water inlet 7-2; in the second water circulation pipeline, water in the boiler barrel 7 flows out from the second water outlet 7-3, passes through the first evaporation heating surface 12 and the second evaporation heating surface 14 respectively, passes through the first water pump 8-1, and flows back to the boiler barrel 7 from the second water inlet 7-4.
More specifically: the steam pipeline is characterized in that steam flows out from a steam outlet 7-5, sequentially passes through a primary superheater 13, a secondary superheater 10, a steam turbine 18 and a condenser 17, is condensed into water, sequentially flows through a degassing device 16, a third water pump 8-3 and an economizer 15, reaches a third water inlet 7-6, and flows back to the boiler barrel 7.
It should be noted that the invention does not specify other common structural components of the boiler, such as a feeding device, a grate form, an air supply system and the like, and is applicable to common waste incineration boilers.
A novel waste incineration boiler combustion chamber structure based on high-temperature phase change energy storage refractory bricks mainly comprises novel phase change energy storage refractory bricks 3 made of ceramic-based materials and a novel steam/water circulation system.
FIG. 1 is a schematic structural view of a boiler combustion chamber wall; the installation position of the phase-change energy-storage refractory brick 3 in the boiler combustion chamber is shown in the figure; 3 is a phase change energy storage firebrick, 4 is mortar for fixing the firebrick 3, 5 is a heat exchange tube, and 6 is a heat insulation outer wall. The refractory brick 3 is arranged on one side of the heat exchange tube 5; the heat transferred to the heat exchange tube 5 is substantially uniform by the conditioning action of the phase change material 2. Meanwhile, the refractory bricks 3 are made of the corrosion-resistant ceramic material 1, so that the heat exchange tubes 5 can be effectively protected from being damaged by corrosive gas in the combustion chamber 11.
FIG. 2 is a schematic structural view of a refractory brick; FIG. 3 is a sectional view taken along line A-A of FIG. 2; the novel phase change energy storage refractory brick of the ceramic material 1 has a specific structure as shown in figure 3. The size ratio of the refractory brick is similar to that of the existing common refractory brick; the main components of the ceramic material are high-temperature resistant ceramic materials 1, such as Al2O3, AlN or Si3N 4. A cylindrical hole is formed in the refractory brick 3, the bottom of the cylindrical hole is in an arc shape, and a high-temperature phase change material 2 is filled in the cylindrical hole and mainly comprises metal aluminum; or an aluminum-silicon mixture can be adopted, wherein the mass fraction of silicon is 8-15%; it can also be aluminum-silicon-copper mixture, aluminum-silicon-magnesium mixture, aluminum-silicon-zinc mixture, aluminum-magnesium-zinc mixture, etc.
As shown in fig. 3, the phase change material 2 is filled with a certain space from the top of the firebricks 3, so that the phase change material 2 can freely expand in the vertical direction to prevent damage to the firebricks due to temperature change. The phase-change material 2 in the phase-change energy-storage refractory brick 3 can absorb the redundant heat in the hearth 10 and is converted from a solid state to a liquid state; converting the excess heat to latent heat of phase change; when the temperature of the hearth 10 is reduced, the phase-change material 2 is converted from a liquid state to a solid state, and latent heat of phase change is released, so that stable work of heat exchange devices (a secondary superheater 10 and a hearth evaporation heating surface 9) arranged in the wall of the combustion chamber 11 is ensured.
FIG. 4 is a schematic structural view of a boiler; compared with the combustion chamber of the traditional waste incineration boiler, the inner wall of the combustion chamber 11 is replaced by the refractory bricks 3 made of the phase change energy storage material; and a secondary superheater 10 is arranged in the lower part of the boiler combustion chamber 11; the upper part of the combustion chamber 11 is a hearth evaporation heating surface 9. In the boiler, water is changed into a mixture of steam and water through a hearth evaporation heating surface 9, a first evaporation heating surface 12 and a second evaporation heating surface 14 and then enters a boiler barrel 7; the steam enters a primary superheater 13 after coming out of the drum 7, and the heating temperature reaches about 400 ℃; then the mixture enters a secondary superheater 10, and is heated by refractory bricks 3 to reach the temperature of 600 ℃; after passing through the turbine 18 and the condenser 17, the water is turned into water, and enters the degasser 16 and the economizer 15, and then enters the drum 7, completing a cycle.
Compared with the boiler with the traditional structure, the boiler with the combustion chamber structure can improve the efficiency by about 30 percent.
The trend of the smoke is as follows: the black bold solid line is a flue gas channel 19, the left side is a hearth 20, a combustion chamber 11 is arranged below the hearth 20, namely areas where a hearth evaporation heating surface 9 and a secondary superheater 10 are located, the inner side is a refractory brick 3, fire is burnt in the combustion chamber 11, the fire can heat the flue gas, and the flue gas sequentially passes through a first evaporation heating surface 12, a primary superheater 13, a second evaporation heating surface 14 and an economizer 15 along the hearth 20 and the flue gas channel 19 and then is discharged;
the trend of water: the boiler barrel 7 is filled with water, the solid line represents the trend of the water, the water is divided into two strands, one strand of water flows downwards to the hearth evaporation heating surface 9, namely the side wall of the combustion chamber 11 and then returns to the boiler barrel 7, and the other strand of water flows out of the boiler barrel 7 to two places, namely a first evaporation heating surface 12 and a second evaporation heating surface 14 respectively, and then returns to the boiler barrel 7; the water in the boiler barrel 7 is heated to generate steam, the dotted line is the trend of the steam, the steam firstly flows to the first-stage superheater 13, then flows to the second-stage superheater 10 through a pipeline, is heated by the side wall (refractory bricks) of the second-stage superheater 10 to form superheated steam, then enters the steam turbine 18 to generate power, and finally is condensed into water through the condenser 17 to return to the boiler barrel 7.
Claims (6)
1. A waste incineration boiler is characterized by comprising a combustion chamber (11), a boiler barrel (7), a first evaporation heating surface (12), a first-stage superheater (13), a second evaporation heating surface (14), an economizer (15), a degassing device (16), a condenser (17), a steam turbine (18), a flue gas channel (19) and a hearth (20); the combustion chamber (11) is positioned below the hearth (20) and is divided into an upper part and a lower part, the heat exchange tubes (5) in the upper outer wall (6) form a hearth evaporation heating surface (9), and the heat exchange tubes (5) in the lower outer wall (6) form a secondary superheater (10); the hearth (20) is communicated with a flue gas channel (19), and the first evaporation heating surface (12), the first-stage superheater (13), the second evaporation heating surface (14) and the economizer (15) are arranged in the flue gas channel (19) from top to bottom; the boiler barrel (7) is provided with a first water outlet (7-1), a first water inlet (7-2), a second water outlet (7-3), a second water inlet (7-4), a steam outlet (7-5) and a third water inlet (7-6), one end of a hearth evaporation heating surface (9) is communicated with the first water outlet (7-1), the other end of the hearth evaporation heating surface (9) is communicated with the first water inlet (7-2), one ends of a first evaporation heating surface (12) and a second evaporation heating surface (14) are simultaneously communicated with the second water outlet (7-3), the other ends of the first evaporation heating surface and the second evaporation heating surface are simultaneously communicated with the second water inlet (7-4), and the steam outlet (7-5) is sequentially communicated with a first-stage superheater (13), a second-stage superheater (10), a steam turbine (18), a condenser (17), The degassing device (16) and the economizer (15), wherein the economizer (15) is communicated with a third water inlet (7-6);
the combustion chamber is formed by bonding a phase change energy storage refractory brick (3), mortar (4) and an outer wall (6) from inside to outside; the heat exchange tube (5) is horizontally arranged at the joint of the outer wall (6) and the mortar (4), the mortar (4) is used for bonding the phase change energy storage refractory brick (3), the heat exchange tube (5) and the outer wall (6) together, a plurality of deep holes are formed in the phase change energy storage refractory brick (3), phase change materials (2) are filled in the deep holes, and the phase change energy storage refractory brick (3) is made of ceramic materials (1); the phase-change material (2) is metal aluminum, aluminum-silicon mixture, aluminum-silicon-copper mixture, aluminum-silicon-magnesium mixture, aluminum-silicon-zinc mixture or aluminum-magnesium-zinc mixture.
2. A waste incineration boiler according to claim 1, characterized in that it further comprises a water pump set, the water pump set comprising a first water pump (8-1), a second water pump (8-2) and a third water pump (8-3); the second water pump (8-2) is arranged between the evaporation heating surface (9) of the hearth and the first water inlet (7-2), the first water pump (8-1) is arranged between the first evaporation heating surface (12) and the second evaporation heating surface (14) and the second water inlet (7-4), and the third water pump (8-3) is arranged between the economizer (15) and the degassing device (16).
3. A working method of a waste incineration boiler based on the claim 2, characterized in that the waste is put in a combustion chamber to be ignited, the high temperature flue gas generated by combustion exchanges heat with the phase change energy storage firebrick (3) at the inner side of the combustion chamber (11) and further exchanges heat with a secondary superheater (10) and a hearth evaporation heating surface (9); high-temperature flue gas generated during combustion is subjected to heat exchange in the flue gas channel (19) and then is discharged out of the flue gas channel (19); the boiler barrel (7) is filled with water, and the water in the boiler barrel (7) exchanges heat with the furnace through two water circulation pipelines to form saturated water and saturated steam which flows back to the boiler barrel; the saturated steam forms superheated steam through a steam circulating pipeline, drives a steam turbine (18) to generate power, condenses the power into water and then flows back to the drum (7).
4. The working method of the waste incineration boiler according to the claim 3, characterized in that the flue gas is discharged out of the boiler after flowing through the first evaporation heating surface (12), the first-stage superheater (13), the second evaporation heating surface (14) and the economizer (15) in sequence in the flue gas pipeline.
5. The operating method of a waste incineration boiler according to claim 3, wherein the two water circulation pipes are a first water circulation pipe and a second water circulation pipe, respectively; in the first water circulation pipeline, water in the boiler barrel (7) flows out from the first water outlet (7-1), and flows back to the boiler barrel (7) from the first water inlet (7-2) through the second water pump (8-2) after passing through the heat exchange pipe of the hearth evaporation heating surface (9); in the second water circulation pipeline, water in the boiler barrel (7) flows out from the second water outlet (7-3), passes through the first evaporation heating surface (12) and the second evaporation heating surface (14) respectively, passes through the first water pump (8-1), and flows back to the boiler barrel (7) from the second water inlet (7-4).
6. The operating method of the waste incineration boiler according to the claim 3, characterized in that the saturated steam flows out from the steam outlet (7-5), and after passing through the primary superheater (13), the secondary superheater (10), the steam turbine (18) and the condenser (17) in sequence, the steam is condensed into water, and flows through the degasser (16), the third water pump (8-3) and the economizer (15) in sequence to reach the third water inlet (7-6) and flows back to the boiler barrel (7).
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| CN87200757U (en) * | 1987-01-23 | 1988-05-11 | 河北省科学院能源研究所 | Controllable fast starting coal-saving stove |
| CN2084771U (en) * | 1990-12-22 | 1991-09-18 | 华中理工大学 | Chafing dish heated by heat accumulating element with metallic phase variation |
| CN102620321A (en) * | 2012-04-24 | 2012-08-01 | 广州市恒鼎酒店设备有限公司 | Energy-saving gas stove |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101225492A (en) * | 2008-01-29 | 2008-07-23 | 武汉理工大学 | High-temperature heat-storage material and uses thereof |
| GB2485798B (en) * | 2010-11-24 | 2014-06-25 | Zenex Technologies Ltd | A heater |
| CN205655728U (en) * | 2016-03-28 | 2016-10-19 | 沧州渤海新区元大自然能源有限公司 | Composite heat storage body |
| CN207279782U (en) * | 2017-10-12 | 2018-04-27 | 黑龙江大学 | A kind of biomass energy-storage type heater and change-vacuum-phase change radiator heating system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87200757U (en) * | 1987-01-23 | 1988-05-11 | 河北省科学院能源研究所 | Controllable fast starting coal-saving stove |
| CN2084771U (en) * | 1990-12-22 | 1991-09-18 | 华中理工大学 | Chafing dish heated by heat accumulating element with metallic phase variation |
| CN102620321A (en) * | 2012-04-24 | 2012-08-01 | 广州市恒鼎酒店设备有限公司 | Energy-saving gas stove |
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