CN203757800U - Flue gas waste heat recycling device in commercial Chinese food fuel gas cooking oven - Google Patents

Flue gas waste heat recycling device in commercial Chinese food fuel gas cooking oven Download PDF

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Publication number
CN203757800U
CN203757800U CN201420106655.2U CN201420106655U CN203757800U CN 203757800 U CN203757800 U CN 203757800U CN 201420106655 U CN201420106655 U CN 201420106655U CN 203757800 U CN203757800 U CN 203757800U
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CN
China
Prior art keywords
waste heat
flue gas
gas
cold water
flue
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Expired - Fee Related
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CN201420106655.2U
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Chinese (zh)
Inventor
刘仁昌
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Shanghai Zi Yin Energy Saving Environmental Protection Technology Co ltd
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Individual
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Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model discloses a flue gas waste heat recycling device in a commercial Chinese food fuel gas cooking oven. The flue gas waste heat recycling device externally comprises a flue (1) at the back of a kitchen range, an inner interlayer hot water tank (2), a hot water faucet (3) and a hot water supplying circulating system connected with a tail boiler (4); a water-air interstage valve and a flue gas and air mixer complexus device (16) can synchronously operate inside the flue gas waste heat recycling device, and waste heat in a cold water circulating copper disc pipe (9) flows out from the water-air interstage valve and the flue gas and air mixer complexus device and passes through a fireproofing material (13) arranged on the bottom of a hearth (12) to flow to the inner wall of a casting iron pan frame (6) arranged on the top of the flue gas waste heat recycling device; the waste heat in the cold water circulating copper disc pipe (9) flows to outer layers of upper and lower fireproofing ceramic rings (10) arranged on the periphery of a full pre-mixing burner (11) arranged in the middle of the flue gas waste heat recycling device along the lower layer of a waste heat radiation plate (8), the waste heat passes through the cold water circulating copper disc pipe (9) from top to bottom, then enters the flue at the bottom of the hearth (12) and flows into a hot water tank (2) through the tail boiler (4). The flue gas waste heat recycling device provided by the utility model has the advantages that waste heat discharged by high temperature smoke is fully utilized and recycled, and a green environment-friendly requirement and an energy-saving and consumption reducing target are met.

Description

Flue gas heat recovery device in a kind of commercial Chinese Cooking Gas Appliance
Technical field
The utility model relates to the gas stove for Chinese cooking of hotel, large scale business food and drink and enterprises and institutions' dining room culinary art, flue gas heat recovery device in especially a kind of commercial Chinese Cooking Gas Appliance.
Technical background
The technology of the commercial gas cooking apparatus of domestic production at present is also in relatively backward state, and especially traditional blowing-type Chinese Cooking Gas Appliance is a big power consumer (power is all in 42~60kW left and right).It is mainly to get off to realize stronger combusting firepower by configuration high load capacity operating mode, though met the demand of culinary art to dish speed under effective heat duty, make like this heat energy loss very large, energy efficiency is very low, connect in former GB7824-1987 Chinese Cooking Gas Appliance GB (then substituted by CJ/T28-1999 Chinese Cooking Gas Appliance Ministry of Construction professional standard), the thermal efficiency of cooking stove is required to be not less than 20% index and does not all reach, after in the CJ/T28-2003 Chinese Cooking Gas Appliance professional standard of revision, deleted on the contrary the thermal efficiency performance indications and test method.Reason is that great majority are produced the producers of traditional blowing-type Chinese Cooking Gas Appliance and are all difficult to reach the thermal efficiency and are not less than 20% desired value, and generally, all in 16~18% left and right, more than 80% gas energy is arranged and slatterned by flue in vain.
Due to the backward combustion method that the past all adopts traditional ditch wind furnace to carry out forced-air blast, the burning of ditch wind furnace is to adopt combustion gas to mix with the each comfortable burner hearth of air, does not fully reach best and effectively mixes; Consumption gas, power consumption, efficiency is low, noise is large.Wherein in fume emission, the numerical value of nuisance is also higher, thereby atmosphere is produced to the harm rising of severe contamination, adds defect in the environmental protection such as combustion noise is very large.China's energy scarcity, advocate today of " energy-saving and emission-reduction ", " low-carbon (LC) life " in government, the commercial gas-fired stove prodigiosin effect limit value and the efficiency grade new standard that are about to newly formulation of promulgation for meeting are opportunity, and needing the rapid superseded traditional type large, efficiency is low, Environment protection and safety is poor that consumes energy to fall behind commercial gas utensil product is to be imminent.
Summary of the invention
It is a kind of for commercial Chinese Cooking Gas Appliance that the utility model provides, the dish of Chinese meal need be under high load capacity fuel gas buring operating mode, both the color of Chinese style cooking, the culinary art firepower effect of good characteristic had been reached, utilize again high load capacity combustion gas to be reclaimed by the high-temperature flue gas of the strong meal with wine that gives off after burning, reach the energy-saving and cost-reducing remarkable result of UTILIZATION OF VESIDUAL HEAT IN.
In the eight big cuisines of China, calculate river, Guangdong dishes meat and fish dishes is higher to call for fire, wherein Guangdong dishes are for the highest.The utility model project organization is a kind of waste heat recovery and utilization of commercial Chinese Cooking Gas Appliance.In the first; The high-temperature residual heat that adopts fume emission to go out in burner hearth, first produces infra-red radiation by waste heat radiant panel (fire-resistant oxidation resistant synthesizes metal material), and secondary heat exchange is carried out in the bottom of a pan, can enhanced burning efficiency reach more than 10%.It two is, after adopting cold water round-robin method to reclaim burning, be emitted on the high-temperature flue gas in burner hearth, thoroughly solving the extremely hot high temperature producing because of burning can be rapidly by the cast iron cooker racks in kitchen range, stainless steel fender, the puzzlement difficult problem that kitchen range frame and burner hearth absorb, effectively recovery waste heat produces the utilization of hot water supply, by above-mentioned conservation measures, the loss of heat after Chinese Cooking Gas Appliance fuel gas buring is down to minimum, can make integrated heat efficiency >=50%, improve more than 150% than thermal efficiency index (>=20%) in the Chinese Cooking Gas Appliance national standard of former GB7824-87, be 35%(2 level value than < Energy efficiency evaluation value > in " commercial gas-fired stove prodigiosin effect limit value and the efficiency grade " national standard that will promulgate) improve 42.85%, also improve 11% than 45% (1 grade of value).Therefore, energy-saving effect is significantly given prominence to, and is to belong to unprecedented.
Brief description of the drawings
Below, with reference to accompanying drawing, for those skilled in the art, to detailed description of the present utility model, above and other object of the present utility model, feature and advantage will be apparent.
Fig. 1 (1) is the front view of flue gas heat recovery device in a kind of commercial Chinese Cooking Gas Appliance;
Fig. 1 (2) is the top view of Fig. 1 (1);
Fig. 1 (3) is the A-A ' cutaway view of Fig. 1 (2); (A-A ' analysing and observe direction should be vertical by now laterally changing into)
Fig. 2 is flue gas heat recovery device burner hearth generalized section in a kind of commercial Chinese Cooking Gas Appliance;
Fig. 3 is Chinese Cooking Gas Appliance structure top view;
Fig. 4 (1) is the structural representation of waste heat reflecting plate in Chinese Cooking Gas Appliance;
Fig. 4 (2) is the top view of Fig. 4 (1);
Fig. 5 (1) is the structural representation of cold water circulation bronze pan tube in Chinese Cooking Gas Appliance;
Fig. 5 (2) is the top view of Fig. 5 (1);
Fig. 6 is overall system structure schematic diagram in the commercial Chinese Cooking Gas Appliance of one of the present utility model.
Reference numeral:
1, flue 2, boiler
3, hot water tap 4, tail pot
5, stainless steel fender 6, cast iron cooker racks
7, iron frying pan 8, waste heat radiant panel
9, cold water circulation bronze pan tube 10, upper and lower refractory circle
11, all-premixing burner 12, burner hearth
13, fire-resistant (brick, mud) material 14, cleaning water falling groove
15, stainless steel kitchen range frame 16, water-gas interstage valve and combustion
Gas,
Air mixer complex device
17, cold valves 18, gas valve
19, spacing ring top cover 20, burner foundry goods shell
21, seedling ignition combustor 22, igniting, flame detect pin
(S2)
23, gas nozzle 24, centrifugal blower
25, seedling fire air (air quantity) supply 26, secondary air flow regulate automatically
Plate
27, air-flow plate (manually adjusting locking) the 28, (combustion of combustion gas automatic regulating valve first
Gas
Motor Ug2)
29, seedling fire air control valve 30, burner cavity pressure tap
31, seedling fire control valve
I, burner unit II, air, combustion gas mixing unit
III, Automatic Control Unit
Detailed description of the invention
Below in conjunction with accompanying drawing, by non-limiting example, the utility model is described.
Accompanying drawing 1(1)~(3) be depicted as a kind of preferred embodiment of the utility model, it is the structural representation of flue gas heat recovery device in a kind of commercial Chinese Cooking Gas Appliance, please be simultaneously in conjunction with the flue gas heat recovery device burner hearth generalized section shown in Fig. 2, and the structure top view of the kitchen range face shown in Fig. 3.
In flue gas heat recovery device, outside by the connected hot water supply circulatory system of flue 1, intraformational bed boiler 2, hot water tap 3, the tail pot 4 of cooking stove back in this commercialization Chinese Cooking Gas Appliance.Its inside is by water-gas interstage valve and combustion gas, 16 simultaneously operatings of air mixer complex device are carried out, cold water copper pipe is from water-gas interstage valve and combustion gas, in air mixer complex device 16, flow out, and through the burner hearth 12 fire-resistant (bricks in bottom, mud) in material 13 through flow to top cast iron cooker racks 6 inwall and with the cold water circulation copper pipe disk 9 as shown in Fig. 5 (1) and Fig. 5 (2) around multi-turn, then cold water circulation bronze pan tube 9 is high temperature resistant along waste heat radiant panel 8(, anti-oxidant synthetic metal material) lower floor ecto-entad dish becomes to be fan-shaped, upper around multilayer ring to central all-premixing burner 11 peripheries, lower refractory circle 10 skins, cause down from above around multilayer disc curved tube, make cold water from high-temperature flue gas waste heat, obtain preheating gradually in the tortuous pipe of copper, then enter in burner hearth 12 bottom flues, through slaughterhouse shoe 4, flow in boiler 2, by the cold water bronze pan tube after fume afterheat, constantly absorb heating of fume afterheat, finally get back to boiler storage, can flow into tail pot 4 cooks for cook thereupon, form like this UTILIZATION OF VESIDUAL HEAT IN energy saver that adopts cold water circulation bronze pan tube in the high-temperature flue gas discharge in cooking stove and obtain hot water.
In this flue gas heat recovery device, first be that cold water is introduced on cast iron cooker racks 6 inwalls that are easily subject to high-temperature flue gas heat transfer, the high temperature that the high-temperature flue gas of absorption cast iron cooker racks 6 easy burned rear discharges transmits, to reduce the thermal loss of fume afterheat and to reduce cast iron cooker racks 6 surfaces by the smoked bright temperature of high-temperature flue gas.
Secondly, when the high-temperature flue gas discharge that iron frying pan 7 produces in the time cooking, a part, in the time that cooking operation turns over pot operation, is directly drained by casting iron pan frame 6 surroundings on iron frying pan 7, and most of high-temperature flue gas is discharged to flue by burner hearth.Described cold water circulation is first by high temperature resistant, the anti-oxidant synthetic metal material of waste heat radiant panel 8(by most of fume afterheat) generation infra-red radiation form, post bake is carried out in the bottom of a pan of iron frying pan 7, increase the bottom of a pan calorific intensity, improved efficiency of combustion more than 10%.High-temperature flue gas is discharged to the cold water circulation bronze pan tube 9 of waste heat radiant panel lower floor simultaneously, absorbed by the cold water in bronze pan tube again, and upper and lower refractory circle 10 detours around combustion chamber, fully reclaim the waste heat energy of high-temperature flue gas, again in burner hearth discharged to flue, the cold water of heating gradually in coil pipe again, then the hot water that cold water is heated is by burner hearth bottom floss hole, again absorb fume afterheat in flue and heat up again, then the high-temperature-hot-water absorbing after waste heat is flowed to storage in the boiler 2 in exit flue interlayer.
In addition, to the waste heat recovery in high-temperature flue gas discharge, must reach the cold water circulation coil design condition that adopts, that building is not affecting and meeting the quality criterion that its Chinese meal dish is cooked under high load capacity Firepower Configuration, cold water circulation bronze pan tube circulates to absorb and fries the high-temperature flue gas energy of discharging after stove burning in cooking stove burner hearth, entirety innovative characteristics is to meet law of conservation of energy, reaches energy-saving and cost-reducing remarkable result.Sum up said structure, can recognize, in the commercial Chinese Cooking Gas Appliance of one of the present utility model, flue gas heat recovery device primary structure comprises:
The first, the waste heat that the high-temperature flue gas being produced by burning gives off, first produces infra-red radiation form by waste heat radiant panel 8, and post bake is carried out in the bottom of a pan of iron frying pan 7, has increased heat strong degree in the bottom of a pan is absorbed, and has further improved efficiency of combustion.
The second, cold water circulation bronze pan tube 9 systems are divided inside and outside two parts; Its outside is by the connected hot water supply circulatory system of flue 1, intraformational bed boiler 2, hot water tap 3, the tail pot 4 of cooking stove back.Its inside is by water-gas interstage valve and combustion gas, 16 simultaneously operatings of air mixer complex device are carried out, cold water circulation bronze pan tube 9, see in Fig. 2 and pass through water by the upstream end of cold water---gas interstage valve and combustion gas, air mixer complex device 16 is controlled, from water-interstage valve and combustion gas, air mixer complex device 16, and through the fire-resistant (brick in the bottom of burner hearth 12, mud) in material 13 through flow to top cast iron cooker racks 6 inwall and with cold water circulation copper pipe disk 9 around multi-turn, then cold water circulation bronze pan tube 9 is along Fig. 4 (1) and 4(2) shown in waste heat radiant panel 8 lower floor's ecto-entad dishes become to be fan-shaped, upper around multilayer ring to central all-premixing burner 11 peripheries, lower refractory circle 10 skins, cause down from above around multilayer disc curved tube, make cold water from high-temperature flue gas waste heat, obtain preheating gradually in the tortuous pipe of copper, then enter in burner hearth 12 bottom flues, through tail pot 4, flow in boiler 2, by the cold water circulation bronze pan tube after fume afterheat, constantly absorb heating of fume afterheat, finally make cold water become hot water return to boiler storage, while needs, open at any time hot water tap 3 and can flow into tail pot 4, cook for cook, equally also can open at any time the cold water faucet (here not shown go out) of back flue upper end cooks for cook, form like this UTILIZATION OF VESIDUAL HEAT IN energy conserving system device that adopts cold water circulation bronze pan tube in the high-temperature flue gas discharge in cooking stove and obtain hot water.
Whole operation sequence process: each operation, in conjunction with the overall system structure principle schematic of the utility model embodiment shown in Fig. 6, is sent enabled instruction by guidance panel and carried out safe operating mode operation to the Automatic Control Unit in figure.Operation first first contacts the power switch of guidance panel with hand point, make E 1, E 2must be electric, first start blower fan F 2move after tens of seconds, automatic controller is just exported S 1signal detects pin S to igniting, flame 2implement seedling ignition combustor to carry out automatic ignition, if seedling fire does not detect flame at the appointed time, automatic controller can cut off rapidly gas source, and sound and light alarm prompting, enters defence program, and now guidance panel instruction need be restarted operation.If seedling fire is lighted successfully, automatic controller can wait after flame stabilization, carries out fast self-locking, opens D in gas electromagnetic valve 1(Miao Huofa) open combustion gas GAS 1lead to D 1(Miao Huofa), output seedling fire combustion gas gas 1send into gas by pipeline 2pipeline enters seedling fire control valve 31, and adjustable specified seedling fire consumption tolerance, simultaneously to seedling fire air (air quantity) supply 25 output air 1air duct is sent into air 2pipeline enters seedling fire air control valve 29 and seedling fire control valve 31 adjusted in concert, and after mixing in proportion, sends into seedling ignition combustor 21 and wait for ignition.S lights a fire this moment 1signal is sent to igniting, flame detects pin S 2just light rapidly seedling ignition combustor 21, after flame ion conduction, at once locking D in magnetic valve 2(main fire valve) opened, combustion gas GAS 2flow to GAS 3enter combustion gas automatic regulating valve Ug 228, wait for that main burner operates and heat load adjustment is fried stove burning.Now press Fig. 1, open combustion gas automatic regulating valve Ug in Fig. 6 at need 2before 28, must first open cold valves 17, cold water is introduced in water-gas interstage valve and combustion gas, air mixer complex device 16, once open main burner 11, must first open cold valves 17 in Fig. 1, operation combustion valve 18 must be treated the main fire valve (D in Automatic Control Unit in Fig. 6 (III) magnetic valve 2) output main fiery combustion gas GAS 2, at once enter in water-interstage valve and combustion gas, air mixer complex device 16, open in Fig. 1 after cold valves 17 cold water Fen Er road; One tunnel supply kitchen range back flue upper end and hot water tap cold water faucet arranged side by side (not shown go out), need cold water can cook for cook time.The combustion gas in advance immediately of another road cold water is supplied flowing of cold water circulation bronze pan tube to frying in stove thorax in 2~3 seconds, utilizes waste heat in flue gas to produce hot water circuit supply and hot water storage.In Fig. 6, the right of the differential water pressures film in 16 hydraulic pressure is greater than the left side this moment, makes differential water pressures film promote combustion gas top rod valve, plays water, gas interlock effect.Now, make main fiery combustion gas GAS 2in former pipeline, wait state flows into combustion gas GAS at once 3pipeline, enters the combustion gas automatic regulating valve Ug of Fig. 6 2in 28, then by combustion gas GAS 3by nozzle 23 (according to product export rated heat input, rated heat load and design discharge), flow to blender in air, combustion gas mixing unit (II), finally gaseous mixture is sent in Fig. 6 burner unit (I) and carried out completing combustion.Operator can carry out heat load adjustment to main burner at any time and meet the requirement of different dish combusting firepower.When after operator's closing gas valve 18, the cold water circulating system in main burner 11 and water-interstage valve and combustion gas, air mixer complex device 16, can stop (considering the waste heat of remaining flue gas in burner hearth) after the time delay several seconds.Again when moral conduct, cold feed action is than gas supply output in first 2~3 seconds in advance at every turn.
The utility model is compared with current traditional product, and its main feature has:
1, the waste heat recovery in high-temperature flue gas discharge is adopted the prerequisite of cold water circulation coil design; That building is criterion not affecting the quality that Chinese meal dish cooks under high load capacity Firepower Configuration, cold water circulation bronze pan tube circulates to absorb and fries the high-temperature flue gas energy of discharging after stove burning in cooking stove burner hearth, get rid of high-temperature flue gas and can be produced cold wall phenomenon by the impact of chilled water coil, entirety innovative characteristics is to meet law of conservation of energy, reaches energy-saving and cost-reducing remarkable result.
2, make full use of high-temperature flue gas waste heat and produce infra-red radiation by waste heat radiant panel (fire-resistant oxidation resistant synthesizes metal material), secondary carries out radiation to the bottom of a pan of iron frying pan, increase the bottom of a pan calorific intensity, reached more than 10% thereby improved again combustion thermal efficiency on former basis.
3, utilize high-temperature flue gas to pass through waste heat radiant panel again discharged to burner hearth bottom, again absorbed waste heat by cold water circulation bronze pan tube, making cold water is that hot water storage can be used at any time in boiler, finally enter slaughterhouse shoe passage, make part high-temperature flue gas again by heating that cold water absorbs in tail pot, the loss of heat after Chinese Cooking Gas Appliance fuel gas buring is down to minimum, cold water can be circulated in and in off-gas recovery, increase again by 6~8% thermals efficiency, effectively the reach a high temperature conservation measures of flue gas heat recovery, makes integrated heat efficiency >=50% remarkable result.
4, to the large hotel of more this gas range for cooking Chinese food, the industry of cooking a meal of eating are installed, suggestion can be together in series the hot water of boiler storage in cooking stove, full once boiler storage in cooking stove, electronic heat-exchanger pump starts automatically, the hot water unification of several boilers can be squeezed in large-scale hot water thermal insulating case and held storage, use that can centralizedly supply kitchen wash dining set.
5, adopt the Based Intelligent Control monolithic machine advanced technology of autonomous Design, can carry out full automatic working and input combustion gas and air mixing ratio data by follow procedure, realize the interlock of water, gas and synchronous motor and can carry out respectively the accurate ratio of air and combustion gas and regulate operation, make it that moral conduct is simple, material benefit, reliably and safety.
All embodiment are only for illustration of the utility model above, but not to restriction of the present utility model, and therefore all technical schemes that are equal to also should belong to category of the present utility model and should be limited by each claim.

Claims (5)

1. a flue gas heat recovery device in commercial Chinese Cooking Gas Appliance, is characterized in that,
The outside flue (1) that comprises cooking stove back of described device, intraformational bed boiler (2), hot water tap (3), the hot water supply circulatory system that tail pot (4) is connected, described device is inner by water-gas interstage valve and combustion gas, air mixer complex device (16) simultaneously operating is carried out, one cold water circulation bronze pan tube (9) is from water-interstage valve and combustion gas, air mixer complex device flows out, and in the refractory material (13) of burner hearth (12) bottom through the inwall of a cast iron cooker racks (6) that flows to top, described cold water circulation bronze pan tube (9) is upper along waste heat radiant panel (8) lower floor to central all-premixing burner (11) periphery, lower refractory circle (10) skin, from top to bottom around described cold water circulation bronze pan tube (9), then enter in the flue of burner hearth (12) bottom, through tail pot (4), flow in boiler (2).
2. flue gas heat recovery device in the commercial Chinese Cooking Gas Appliance of one according to claim 1, is characterized in that,
Lower floor's ecto-entad dish of described waste heat radiant panel (8) becomes to be fan-shaped, and its inside is made up of multilayer ring.
3. flue gas heat recovery device in the commercial Chinese Cooking Gas Appliance of one according to claim 2, is characterized in that,
Described cold water circulation copper pipe disk (9) forms around multi-turn from bottom to top.
4. according to flue gas heat recovery device in the commercial Chinese Cooking Gas Appliance of the one described in claim 2 or 3, it is characterized in that, described device further comprises:
One cold valves (17), arranges and gas valve (18) interlocked startup that operates air inlet, is combined into water-gas interstage valve and combustion gas, air mixer complex device (16).
5. flue gas heat recovery device in the commercial Chinese Cooking Gas Appliance of one according to claim 4, is characterized in that,
Described waste heat radiant panel (8) is arranged at the top of described cast iron cooker racks (6) lower end, burner hearth (12) inwall, described cold water circulation bronze pan tube (9) be arranged on described waste heat radiant panel (8) lower floor and around combustion chamber all-premixing burner (11) around upper and lower refractory circle (10) outer wall detour.
CN201420106655.2U 2014-03-10 2014-03-10 Flue gas waste heat recycling device in commercial Chinese food fuel gas cooking oven Expired - Fee Related CN203757800U (en)

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Application Number Priority Date Filing Date Title
CN201420106655.2U CN203757800U (en) 2014-03-10 2014-03-10 Flue gas waste heat recycling device in commercial Chinese food fuel gas cooking oven

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Application Number Priority Date Filing Date Title
CN201420106655.2U CN203757800U (en) 2014-03-10 2014-03-10 Flue gas waste heat recycling device in commercial Chinese food fuel gas cooking oven

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Publication Number Publication Date
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107741035A (en) * 2017-11-20 2018-02-27 柳惠斌 A kind of forced-ventilated complete lower grate furnace stove that mixes up in advance
CN107763680A (en) * 2017-09-26 2018-03-06 南充烽英堂厨房电器设备科技有限公司 A kind of integrated large stove of used heat conversion
CN110953606A (en) * 2019-12-13 2020-04-03 浙江九龙智能家居有限公司 Gas cooking stove with waste heat recovery function and using method thereof
CN112303672A (en) * 2020-05-09 2021-02-02 广东爱普电器有限公司 Energy-saving domestic gas range

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107763680A (en) * 2017-09-26 2018-03-06 南充烽英堂厨房电器设备科技有限公司 A kind of integrated large stove of used heat conversion
CN107741035A (en) * 2017-11-20 2018-02-27 柳惠斌 A kind of forced-ventilated complete lower grate furnace stove that mixes up in advance
CN110953606A (en) * 2019-12-13 2020-04-03 浙江九龙智能家居有限公司 Gas cooking stove with waste heat recovery function and using method thereof
CN112303672A (en) * 2020-05-09 2021-02-02 广东爱普电器有限公司 Energy-saving domestic gas range

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