CN107314665B - A kind of gas-fired cupola typed high temperature air burning device and method - Google Patents
A kind of gas-fired cupola typed high temperature air burning device and method Download PDFInfo
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- CN107314665B CN107314665B CN201610615668.6A CN201610615668A CN107314665B CN 107314665 B CN107314665 B CN 107314665B CN 201610615668 A CN201610615668 A CN 201610615668A CN 107314665 B CN107314665 B CN 107314665B
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/08—Shaft or like vertical or substantially vertical furnaces heated otherwise than by solid fuel mixed with charge
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/10—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit
- F16K11/20—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by separate actuating members
- F16K11/22—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by separate actuating members with an actuating member for each valve, e.g. interconnected to form multiple-way valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
- F27B1/28—Arrangements of monitoring devices, of indicators, of alarm devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0033—Heating elements or systems using burners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/007—Systems for reclaiming waste heat including regenerators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0033—Heating elements or systems using burners
- F27D2099/0053—Burner fed with preheated gases
- F27D2099/0056—Oxidant
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2003/00—Type of treatment of the charge
- F27M2003/13—Smelting
Abstract
The present invention provides a kind of gas-fired cupola typed high temperature air burning device and methods, belong to the gas-fired cupola field of casting, heat-preservation cotton production.The gas-fired cupola typed high temperature air burning device includes gas-fired cupola, eight ways valve, air system, flue gas system, high-temperature air burning device, pneumatic operated valve；Middle top in the gas-fired cupola is equipped with fusing preheating section；The high-temperature air burning device is located at the lower section of gas-fired cupola, and the eight ways valve is located at outside gas-fired cupola, and is located at the upper side of fusing preheating section；The air system and flue gas system are connect with eight ways valve respectively, and the air system includes cold air pipe and high temperature air pipe；The flue gas system includes chimney and high-temperature flue gas pipe；The eight ways valve includes hot end four-way valve, heat storage group and cold end four-way valve, and the hot end four-way valve, cold end four-way valve are located at the two sides of the heat storage group；One end of the high-temperature flue gas pipe is connect with hot end four-way valve, and the other end is connect with gas-fired cupola.
Description
Technical field
The invention belongs to cast, heat-preservation cotton production gas-fired cupola field, and in particular to a kind of gas-fired cupola high temperature
Air combustion device and method.
Background technique
Combustion gas cokeless furnace cupola is the furnace cupola with natural gas, coke-stove gas, liquefied gas etc. for fuel, belongs to the world today
The advanced technology that cast iron smelting, heat-preservation cotton melt in range, last century Great Britain and France Mei Deng, developed country successively carried out gas-fired cupola
Research and use, typical technology be United States Patent (USP) (patent No. US5224985).The nineties is gradually studied due to coke scarcity
Coke and natural gas share, the furnace cupola of net gas, and at present technology is in European Union, the Middle East, the U.S., India, Japan, South Korea etc.
It is used in the casting industry and insulation material industry of country.
The country introduce certain gas-fired cupola be applied to spheroidal graphite cast-iron, 1530 DEG C of melt temperature, gas consumption
80m3/t.To improve bonded hard ferrite magnet and reducing energy consumption, using oxygen-enriched combustion technology, gas consumption is 50m3/ t, oxygen consumption
Measure 19m3/t.Though oxygen-enriched improve ignition temperature, reduce gas consumption, in clinker iron content in 5-10%, cause compared with
Big waste.It is further increased the reason is that heating water vapour content in furnace gas under excess oxygen, leads to high-temperature vapor and iron
Between chemically react, while the inhomogeneities of oxygen also cause part iron oxidation cause
The gas-fired cupola used in India introduced in " Metalworld ", the pre- thickness control for being hot-melted section fuel bed
At 2.5-2.85 meters, exhaust gas temperature corresponds between 650 DEG C -250 DEG C, and the thicker bed of material can reduce exhaust gas temperature, but increase
The loading of water-cooled grate, while a large amount of residual loss when blowing out is also resulted in, there is waste.In baker and blowing out early period, in furnace
Thickness of feed layer is thinning, causes exhaust gas temperature higher, causes to waste, and then melting cost is higher.Casting industry is limited by order at present
System, majority are to run less than 8 hours in the odd-numbered day, the combustion gas of starting and the blowing out of gas-fired cupola will be caused to waste, and increase life
Produce cost.
Chinese invention patent (application number 2013105532185) discloses a kind of gas-fired cupola waste heat ladder of rock wool production
The method that grade utilizes, using the high-temperature flue gas after fusing section, the injection radiation recuperator strengthened, fired again using jet flow, convection current
Preheated, combustion air temperature made to reach 500-900 DEG C, but need heat resisting steel and larger heat exchange area, and structure bulky and
It is at high cost, and exhaust gas temperature cannot be reduced automatically with the variation of melting rate.
Most soaring dust removal installations of combustion gas mostly use cyclone dust collectors, spark catcher etc. to be dusted, and cyclone dust removal is only
It is able to achieve the trapping of bulky grain dirt, spark catcher causes the secondary pollution of water.It discharges fume when Some gases furnace cupola continuous operation warm
It spends lower, using the higher bag filter of efficiency of dust collection or electric precipitator, and realizes 20mg/m most tight at present3Discharge mark
It is quasi-.But during baker and blowing out, exhaust gas temperature is higher, is more than that bag filter uses temperature, it has to stop dedusting and change
It is in line, or dedusting again after flue-gas temperature is reduced by the method for increase fresh air, make dedusting increased costs or increases powder
Dirt discharge amount.
Summary of the invention
It is an object of the invention to solve above-mentioned problem existing in the prior art, it is empty to provide a kind of gas-fired cupola high temperature
Gas burner and method improve air preheating temperature to greatest extent, improve melt temperature, reduce combustion gas during baker, blowing out
Consumption reduces exhaust gas temperature, and low cost, low temperature bag filter dedusting can be used, further decrease the fortune of fusing and dedusting
Row cost.
The present invention is achieved by the following technical solutions:
A kind of gas-fired cupola typed high temperature air burning device, including gas-fired cupola, eight ways valve, air system, flue gas system
System, high-temperature air burning device, pneumatic operated valve；
Middle top in the gas-fired cupola is equipped with fusing preheating section；
The high-temperature air burning device is located at the lower section of gas-fired cupola, and the eight ways valve is located at outside gas-fired cupola,
And it is located at the upper side of fusing preheating section；
The air system and flue gas system are connect with eight ways valve respectively, and the air system includes cold air pipe and high temperature
Air hose；
The flue gas system includes chimney and high-temperature flue gas pipe；
The eight ways valve includes hot end four-way valve, heat storage group and cold end four-way valve, the hot end four-way valve, cold end four-way
Valve is located at the two sides of the heat storage group；One end of the high-temperature flue gas pipe is connect with hot end four-way valve, the other end and combustion
The connection of gas furnace cupola；One end of chimney is connect with cold end four-way valve, and the other end is communicated with the atmosphere；One end of the cold air pipe with
Atmosphere is connected with blower, and the other end is connect with cold end four-way valve；High temperature air pipe one end and hot end four-way valve connect
It connects, the other end is connect with high-temperature air burning device.
The pneumatic operated valve is located on hot end four-way valve and cold end four-way valve.
The gas-fired cupola typed high temperature air burning device further comprises smoke-detecting plant, the smoke-detecting plant
Positioned at the outside of eight ways valve, including CO sensor and two probe tubes, solenoid valve is respectively equipped on two probe tubes；One takes
One end of sample pipe is connected to chimney, and the other end is connect with CO sensor, and one end of another probe tube is connected to high-temperature flue gas pipe,
The other end is connect with CO sensor；
Flue gas Venturi tube is respectively equipped on the chimney, high-temperature flue gas pipe；In the cold air pipe, high temperature air pipe
On be respectively equipped with air venturi.Switch by the way that CO content in smoke and the variation of the pressure difference of Venturi tube are two-parameter to determine
The sealing performance of valve, such cold end four-way valve, hot end four-way valve switching valve can examine transition effect and valve sealing performance.
The heat storage group includes air side heat storage, fume side heat storage and partition, the air side heat storage and empty
Gas system connectivity, the fume side heat storage are connected to flue gas system；
The air side heat storage and fume side heat storage are composed of muti-piece honeycomb heat accumulation body, the honeycomb regenerator
Body has rectangular, round or polygonal shaped channels, and it is logical that the channel of the honeycomb heat accumulation body on air side heat storage and partition form air
Road, the channel of the honeycomb heat accumulation body on fume side heat storage and partition form exhaust gases passes.
The hot end four-way valve includes valve chamber and four sets of hot-swap valves being arranged in valve chamber, partition and is arranged in valve chamber
Four sets of outer pneumatic operated valves, a set of hot-swap valve correspond to a set of pneumatic operated valve；The pneumatic operated valve controls hot-swap valve by controller
It opens and closes, air system and flue gas system are divided into different airflow channels by the partition；
Four sets of hot-swap valves are located at the upper left corner, the lower left corner, the upper right corner and the lower right corner in valve chamber, in pairs
It uses, i.e., if the hot-swap valve in the upper left corner and the lower right corner is closed, the hot-swap valve in the lower left corner and the upper right corner is opened, otherwise such as
The hot-swap valve in the fruit lower left corner and the upper right corner is closed, then the hot-swap valve in the upper left corner and the lower right corner is opened；In this way, realizing cigarette simultaneously
In gas system in high-temperature flue gas and air system internal channel high temperature air circulating direction switching, hot-swap valve closing movement direction
It is identical as airflow direction；
Hot-swap valve described in every set includes the thermal valve seat with palace type seal groove, the thermal valve lid with palace type seal groove, sliding
Bearing, refractory matter, support tube, axis thermocouple, hollow shaft, fixed pin and seal plug；
It is equipped with valve passage at the center of the thermal valve seat, the outer rim of thermal valve seat is fixed on the partition, the thermal valve lid
It is used in pairs with thermal valve seat, above or below thermal valve seat, to guarantee hot-swap valve closing movement direction and flue gas or sky
Flow of air direction is identical；
It covers in the thermal valve equipped with valve cover hole, one end of the hollow shaft is fixed on the valve deck by the fixed pin
In hole, the other end of hollow shaft is connected after stretching out valve chamber with a set of pneumatic operated valve, while being fixed with the axis thermoelectricity at the end
It is even；
The hollow shaft is hollow structure, its at thermal valve lid be equipped with air port；
One end of the sliding bearing is fixed on the valve chamber, and is located at the outside of hollow shaft, is determined hollow shaft
Position and support；
The support tube is located at the outside of sliding bearing, and is connected with partition；
The refractory matter is located at the outside of support tube；
When axis thermocouple finds out valve shaft temperature more than design limit, the air for opening air branch pipe is issued by controller
Solenoid valve after air enters hollow shaft, is sprayed through air port, realizes the cooling to hollow shaft.Sliding bearing is located at hollow shaft
Outside, the i.e. inside of support tube, realize the stabilization of hollow shaft.Support tube is connected with partition, and the outside of support tube is with 2-5cm's
Refractory matter keeps out the thermal etching of high-temperature flue gas.
The cold end four-way valve includes valve chamber and four sets of cold switching valves being arranged in valve chamber, partition and is arranged in valve chamber
Four sets of outer pneumatic operated valves, a set of cold switching valve correspond to a set of pneumatic operated valve；The pneumatic operated valve controls cold switching valve by controller
It opens and closes, air system and flue gas system are divided into different airflow channels by the partition；
Four sets of cold switching valves are located at the upper left corner, the lower left corner, the upper right corner and the lower right corner in valve chamber, in pairs
It uses, i.e., if the cold switching valve in the upper left corner and the lower right corner is closed, the cold switching valve in the lower left corner and the upper right corner is opened, otherwise such as
The cold switching valve in the fruit lower left corner and the upper right corner is closed, then the cold switching valve in the upper left corner and the lower right corner is opened；
Cold switching valve described in every set includes the low temperature valve seat with palace type seal groove, the low temperature valve lid with palace type seal groove, fixation
Pin, valve shaft and seal plug；
It is equipped with valve passage at the center of the low temperature valve seat, the outer rim of low temperature valve seat is fixed on the partition, the low temperature valve lid
It is used in pairs with low temperature valve seat, above or below low temperature valve seat；
It covers in the low temperature valve equipped with valve cover hole, one end of the valve shaft is fixed on the valve cover hole by the fixed pin
Interior, the other end of valve shaft is connected after stretching out valve chamber with a set of pneumatic operated valve；
One end of the sliding bearing is fixed on the valve chamber, and be located at valve shaft outside, to valve shaft carry out positioning and
Support；
The support tube is located at the outside of sliding bearing, and is connected with partition.
The palace type seal groove is located on hot-swap valve and cold switching valve, and the palace type seal groove that thermal valve lid and low temperature valve cover is
Raised line, it is recessed that the palace type seal groove on thermal valve seat and low temperature valve seat, which is the palace type seal groove that groove or thermal valve lid and low temperature valve cover,
Slot, the palace type seal groove on thermal valve seat and low temperature valve seat are raised lines, and the two cooperation is pairs of.
The seal plug is installed on above or below the valve cover hole of thermal valve lid and low temperature valve lid, corresponding hollow shaft and valve shaft from
The below or above of valve cover hole is drawn.The mountable any end in thermal valve lid or the axis hole of low temperature valve lid of seal plug is realized not
Same valve shaft installation, and realize the leakproofness of thermal valve lid.
Feeding seal valve is equipped in the top of the fusing preheating section.
The air system further comprises air branch pipe, air solenoid valve and air port；
The air branch pipe is connected with the hollow shaft, and the air solenoid valve is installed in the air branch pipe.
The flue gas system further comprises smoke evacuation thermocouple, and the smoke evacuation thermocouple is located in chimney.
The direction of motion when hot-swap valve and cold switching valve are closed is identical as the air current flow direction of flue gas or air；
The hot-swap valve material is heat-resisting cast iron or heat-resisting alloy steel, and the cold switching valve is plain cast iron.
The gas-fired cupola typed high temperature air burning device further comprises controller, is realized by controller to eight ways valve
Operation；
The movement of controller the control pneumatic operated valve, air solenoid valve, solenoid valve, and receive CO sensor, air text mound
In pipe, the pressure signal of flue gas Venturi tube and axis thermocouple, thermocouple of discharging fume temperature signal.It is cut with logic execution
Change valve cyclic switching, identification switching valve whether sealing performance function and control smog discharge temperature function.
The gas-fired cupola high-temperature air burning method realized using above-mentioned apparatus, comprising:
(1) high temperature air enters high-temperature air burning device from high temperature air pipe and burns with combustion gas, the height for generation of burning
Warm flue gas enters pre- heat fusing section；
(2) after the high-temperature flue gas pipe of the upper side of the preheated fusing section of flue gas enters hot end four-way valve, into heat storage group
Fume side heat storage after, after entering back into cold end four-way valve, be discharged in atmosphere by chimney；
(3) simultaneously, air is after cold air pipe enters cold end four-way valve, into air side heat storage, then enters hot end
Four-way valve enters back into high temperature air pipe；
(4) when the flue-gas temperature signal via controller identification for thermocouple of discharging fume is lower than 150 ± 10 DEG C, controller is to pneumatic
Valve issues 4 hot-swap valves of signal switching hot end four-way valve, while switching 4 cold switching valves of cold end four-way valve, so that cigarette
Gas enters air side heat storage, and air enters fume side heat storage；
(5) when via controller identification is lower than 150 ± 10 DEG C again for the flue-gas temperature signal for thermocouple of discharging fume, controller to
Pneumatic operated valve issues signal switching hot-swap valve and cold switching valve again, recycles progress with this；
(6) pressure signal of air venturi and flue gas Venturi tube is detected, and is stored in controller；
(7) solenoid valve by controller on probe tube carries out interval switching, and realization takes from high-temperature flue gas pipe and chimney
Sample, the concentration signal obtained through CO biosensor analysis are stored in controller；
(7) according to pressure signal and concentration signal in controller is stored in, judge the close of hot-swap valve and cold switching valve
Envelope degree；
(8) when axis thermocouple, which detects hollow shaft temperature, is more than 100 ± 10 DEG C, controller commands the sky in air branch pipe
Pneumoelectric magnet valve is opened, and air enters hollow shaft, is most discharged afterwards through air ejiction opening, realizes the cooling to hollow shaft.
Compared with prior art, the beneficial effects of the present invention are: by the alternate run of high-temperature thermal storage body pair, air is realized
The limit of temperature preheats, and reaches 600-1000 DEG C；The limit smoke evacuation that can realize flue gas simultaneously, reaches 150 DEG C or so, to greatest extent
Reduce the heat that flue gas emission is taken away.It is not only that high-temperature air burning provides the high temperature air needed, and realizes high temperature
The low exhaust gas temperature of furnace realizes that the limit of combustion gas utilizes.
Detailed description of the invention
Fig. 1 is the functional schematic of the preferred embodiment of the present invention
Fig. 2 is the structural schematic diagram of the hot end four-way valve of the preferred embodiment of the present invention
Fig. 3 is hot end switch valve structure detail drawing of the invention
Fig. 4 is cold end switch valve structure detail drawing of the invention
In figure, 1- gas-fired cupola, 2- is hot-melted section in advance, 21- material, 3- eight ways valve, the hot end 4- four-way valve, and 41- is fervent
Change valve, 42- thermal valve seat, 43- thermal valve lid, 44- sliding bearing, 45- refractory matter, 46- support tube, 47- axis thermocouple, 48- is hollow
Axis, 5- heat storage group, 51- air side heat storage, 52- fume side heat storage, 53- partition, 54- honeycomb heat accumulation body, the channel 541-,
55- air duct, 56- exhaust gases passes, 6- cold end four-way valve, the cold switching valve of 61-, 62- low temperature valve seat, 63- low temperature valve lid, 64- are fixed
Pin, 65- valve shaft, 66- seal plug, the palace 67- type groove, 68- valve passage, 69- valve cover hole, 7- air system, 71- cold air pipe, 72-
High temperature air pipe, 73- air, 74- air branch pipe, 75- air solenoid valve, 76- air port, 78- air port, 8- flue gas system
System, 81- high-temperature flue gas pipe, 82- flue gas, 83- chimney, 84- smoke evacuation thermocouple, 9- high-temperature air burning device, 10- flue gas detection dress
It sets, 101-CO sensor, 102- probe tube, 103- solenoid valve, 104- air venturi, 105- flue gas Venturi tube, 11- control
Device processed, 12- seal inlet valve, 13- pneumatic operated valve.
Specific embodiment
Present invention is further described in detail with reference to the accompanying drawing:
The present invention is to propose the high temperature preheating for realizing air on the basis of comprehensive advanced gas-fired cupola both at home and abroad, into
And reach higher combustion temperature, melting efficiency is improved, melt temperature is improved, while the natural gas during reducing baker and blowing out disappears
Consumption, further expansion gas-fired cupola further decrease casting industry energy consumption and pollution in the application range in cast iron, cast steel field
Object discharge.
Gas-fired cupola typed high temperature air burning device of the present invention and method are specific as follows: reducing gas-fired cupola fusing preheating
The thickness of section material, thickness of feed layer are can be controlled within 1.5m, and flue-gas temperature reaches 600-1200 DEG C, and high-temperature flue gas enters hot end
Four-way valve, the exhaust gases passes side honeycomb heat accumulation body group through four-way valve, after being gradually heated up heat storage along honeycomb heat accumulation body channel direction,
Low-temperature flue gas is discharged into chimney through cold end four-way valve；Normal temperature air is through cold end four-way valve, into air duct side honeycomb heat accumulation body group,
It is heated by the accumulation of heat of heat storage group, the hot-air channel into after the four-way valve of hot end, the air for entering back into gas-fired cupola is logical
Road finally removes high-temperature air burning device, realizes high-temperature air burning.
Further, the specific steps are as follows:
Step 1: high temperature air and combustion gas, into the thin preheating melt bed of material, heat melting materialss after burner combustion
Afterwards, high-temperature flue gas enters furnace roof space；The flue gas in furnace roof space, through high temperature air pipe, hot end four-way valve switching valve after enter
Exhaust gases passes, heat exhaust gases passes in honeycomb heat accumulation body, flue gas gradually release heat and will be in heat accumulation of heat to heat storage
Afterwards, into being discharged into chimney after cold end four-way valve；
Step 2: meanwhile, cold air through cold air pipe, cold end four-way valve cold switching valve after enter air duct, air
It absorbs the heat storage accumulation of heat in air duct and is gradually heated, the high temperature air of generation enters after the four-way valve of hot end through switching valve
Into high temperature air pipe, high temperature air finally enters high-temperature air burning device；
Step 3: when thermocouple measurement flue-gas temperature of discharging fume reaches 150 DEG C or lower, signal, control are issued to controller
Original exhaust gases passes are switched to sky by heating end four-way valve, the hot-swap valve of cold end four-way valve and cold switching valve simultaneously operation
Original air duct is switched to exhaust gases passes, and survey until smoke evacuation thermocouple by step 1 and two operations by gas channel
Amount flue-gas temperature reaches 150 DEG C ± 10 DEG C again；
The present invention is specifically as Figure 1-Figure 4, including gas-fired cupola 1, pre- heat fusing section 2, eight ways valve 3, air system
7, the groups such as flue gas system 8, high-temperature air burning device 9, smoke-detecting plant 10, controller 11, sealing inlet valve 12, pneumatic operated valve 13
At the pre- heat fusing section 2 is located at the middle top of gas-fired cupola 1, and the feeding seal valve 11 is located at the upper of pre- heat fusing section 2
Side, the high-temperature air burning device 9 are located at the lower section of gas-fired cupola 1, and the eight ways valve 3 is located on the side of pre- heat fusing section 2
Side, the smoke-detecting plant 10 are located in eight ways valve 3, and the air system 7 and flue gas system 8 are connected to the two of eight ways valve 3
Side, the pneumatic operated valve 13 are located in eight ways valve 3 and realize the operation to eight ways valve 3 by controller 11.
The eight ways valve 3 forms, the hot end four-way valve comprising hot end four-way valve 4, heat storage group 5, cold end four-way valve 6
4, cold end four-way valve 6 is located at the two sides of the heat storage group 5, hot end four-way valve 4 and high-temperature flue gas pipe 81,72 phase of high temperature air pipe
Even, cold end four-way valve 6 is connected with smoke exhaust pipe 83, cold air pipe 71.
The heat storage group 5 is logical comprising air side heat storage 51, fume side heat storage 52, partition 53, air duct, flue gas
Road composition, the air side heat storage 51 and fume side heat storage 52 are composed of muti-piece honeycomb heat accumulation body 54, and honeycomb stores
Hot body 54 has rectangular or circular channel 541, and air duct and cigarette is collectively formed in the channel 541 of honeycomb heat accumulation body 54 and partition 53
Gas channel.
The hot end four-way valve 4 includes the composition such as 53, four sets of four sets of hot-swap valves 41, partition pneumatic operated valves 13, described pneumatic
Valve 13 controls the opening and closing of hot-swap valve 41 by controller 11, and the partition 53 divides air system 7 and flue gas system 8
It is cut into different airflow channels；
The hot-swap valve 41 includes thermal valve seat 42, thermal valve lid 43, sliding bearing 44, refractory matter 45, support tube 46, axis heat
The composition such as galvanic couple 47, hollow shaft 48, fixed pin 64, seal plug 66, palace type groove 67, valve passage 68, valve cover hole 69, the thermal valve seat
There is the valve passage 68 of air-flow at 42 centers, and are fixed on the partition 53, and the thermal valve lid 43 uses in pairs with thermal valve seat 42, can
Above or below thermal valve seat 42, one end of the hollow shaft 48 is fixed in the valve cover hole 69 by the fixed pin 64,
The other end is connected with the pneumatic operated valve 13, and the axis thermocouple 47 is fixed on the same end.The sliding bearing 44 is located at hollow shaft
48 outside, and hollow shaft 48 is positioned.The support tube 46 is located at the assembly of hollow shaft 48 and sliding bearing 44
Outside, and be connected with partition 53, the refractory matter 45 is located at the outside of support tube.The hollow shaft 48 is hollow structure, one end
Air branch pipe 74 and air solenoid valve 75 are connect, the other end has air port 78 at thermal valve lid 43.
The cold end four-way valve 6 includes the composition such as 53, four sets of four sets of cold switching valves 61, partition pneumatic operated valves 13, described pneumatic
Valve 13 controls the opening and closing of cold switching valve 61 by controller 11, and the partition 53 divides air system 7 and flue gas system 8
It is cut into different airflow channels；
The cold switching valve 61 includes low temperature valve seat 62, low temperature valve lid 63, fixed pin 64, valve shaft 65, seal plug 66, palace type groove
67, valve passage 68, valve cover hole 69 form.The low temperature valve seat 62 is fixed on partition 53, and there is valve passage at 62 center of low temperature valve seat
68；The low temperature valve lid 63 uses in pairs with low temperature valve seat 62, can be above or below low temperature valve seat 62.The valve shaft 65 passes through positioning
Pin 64 is fixed in the valve cover hole 69 of low temperature valve lid 63, and 65 other end of valve shaft is connected with pneumatic operated valve 13.
The palace type groove 67 is located on hot-swap valve 41 and cold switching valve 61, the palace type groove on thermal valve lid 43 and low temperature valve lid 43
67 be raised line, and the palace type groove 67 on thermal valve seat 42 and low temperature valve seat 42 is groove, and the two cooperation is pairs of, or in turn, thermal valve lid
43 and low temperature valve lid 43 on palace type groove 67 be groove, the palace type groove 67 on thermal valve seat 42 and low temperature valve seat 42 is raised line.Switching valve point
To open or close in two states, such as Fig. 3 shown in upper figure, airflow direction is top black arrow, i.e., airflow direction is certainly
Under above.Switching valve close when, the direction of motion be also be not from bottom to top from top to bottom.Main cause is top gas after closing
Body has pressure, can have a pressure to act on to the valve of closing, more seal.If it is opposite, and gas will open valve
Door, leads to the reality that is not closed completely.
The seal plug 66 is mountable to above or below the valve cover hole 69 of thermal valve lid 43 and low temperature valve lid 63, and correspondence is hollow
Axis 48 and valve shaft 65 are drawn from the below or above of valve cover hole 69.
The air system 7 includes cold air pipe 71, air duct 55, high temperature air pipe 72, air branch pipe 74, air electricity
Magnet valve 75 and air port composition, the air branch pipe 74 and air solenoid valve 75 are connected with hollow shaft 48, the cold air pipe
71 are connected with cold end four-way valve 6；Described 72 one end of high temperature air pipe is connected with hot four-way valve 4, one end and high-temperature air burning device 9
It is connected.
The flue gas system 8 is formed comprising high-temperature flue gas pipe 81, exhaust gases passes 56, chimney 83, smoke evacuation thermocouple 84, described
High-temperature flue gas pipe 81 is connected with fusing preheating section 2, and the high-temperature flue gas pipe 81 is connected with hot end four-way valve 4, the chimney 83 and
Cold end four-way valve 6 is connected, and the smoke evacuation thermocouple 84 is located in chimney 83.
The smoke-detecting plant 10 includes CO sensor 101, probe tube 102, solenoid valve 103, air venturi
104, flue gas Venturi tube 105 forms, and the flue gas Venturi tube 105 is located in chimney 83 and high-temperature flue gas pipe 81, institute
It states air venturi 104 to be located in cold air pipe 71 and high temperature air pipe 72, the probe tube 102 is located at chimney
83 and high-temperature flue gas pipe 81 in, the probe tube 102 is connected after connecting electromagnetism solenoid valve with CO sensor.
The controller 11 can control the movement of pneumatic operated valve 13, air solenoid valve 75, solenoid valve, be subjected to CO sensor
101, air venturi 104, flue gas Venturi tube 105 signal, be subjected to axis thermocouple 47, discharge fume thermocouple 84 temperature
Signal；
The invention also discloses a kind of gas-fired cupola high-temperature air burning methods, include the following steps:
(1) high temperature air 73 enters high-temperature air burning device 9 from high temperature air pipe 72 and burns with combustion gas, and burning generates
High-temperature flue gas 82 after melting materialss 21, into pre- heat fusing section 2；
(2) after the high-temperature flue gas pipe 81 of the upper side of the preheated fusing section 2 of flue gas 82 enters hot end four-way valve 4, into storage
After the fume side heat storage 52 of hot body group 5, into after cold end four-way valve 6, it is discharged in atmosphere into chimney 83；
(3) air 73 is after cold air pipe 71 enters cold end four-way valve 6, into air side heat storage 51, then enters heat
Four-way valve 4 is held, high temperature air pipe is entered back into；
(4) when the flue-gas temperature signal of smoke evacuation thermocouple 84, when the identification of via controller 11 is lower than 150 ± 10 DEG C, controller
11 issue 4 hot-swap valves 41 from switching hot end four-way valve 4 to pneumatic operated valve 13 (upper left corner and the lower right corner is to close in such as Fig. 2,
Then the lower left corner and the upper right corner is exactly to open), while 4 cold switching valves 61 for switching cold end four-way valve 6, so that flue gas 82 enters
Air side heat storage 51, and air enters fume side heat storage 52；
(5) when smoke evacuation 84 flue-gas temperature signal of thermocouple, when the identification of via controller 11 is lower than 150 ± 10 DEG C again, control
Device 11 issues again to pneumatic operated valve 13 and carries out hot-swap valve 41 and cold switching valve 61, recycles progress with this；
(6) pressure signal of air venturi 104 and flue gas Venturi tube 105 is detected, and, and it is stored in controller 11
In；
(7) solenoid valve 103 by controller 11 on probe tube 102 carries out interval switching, realizes from high-temperature flue gas pipe
81 and chimney 83 sample flue gas, analyze obtained concentration signal through CO sensor 101 and be stored in controller 11；
(7) according to pressure signal and concentration signal big data in controller 11 is stored in, judge hot-swap valve 41 and cold
The seal degree of switching valve 61；
(8) when axis thermocouple 47, which detects 48 temperature of hollow shaft, is more than 100 ± 10 DEG C, controller 11 commands air branch pipe
Air solenoid valve 75 on 74 is opened, and air 73 enters hollow shaft 48, is most discharged afterwards through air ejiction opening 76, is realized to hollow shaft
48 cooling.
When the present invention can guarantee gas-fired cupola operation, preheated air temperature reaches 600-1000 DEG C, gas-fired cupola
Exhaust gas temperature is controlled at 150 DEG C ± 10 DEG C or so.It not only realizes the high temperature melting under high-temperature air burning, but also realizes that flue gas is low
Warm drain utilizes gas thermal energy to greatest extent, further decreases the operating cost of gas-fired cupola, belong to energy-saving new invention skill
Art.
Above-mentioned technical proposal is one embodiment of the present invention, for those skilled in the art, at this
On the basis of disclosure of the invention application method and principle, it is easy to make various types of improvement or deformation, be not limited solely to this
Invent method described in above-mentioned specific embodiment, therefore previously described mode is only preferred, and and do not have limitation
The meaning of property.
Claims (10)
1. a kind of gas-fired cupola typed high temperature air burning device, it is characterised in that: the gas-fired cupola high-temperature air burning dress
It sets including gas-fired cupola, eight ways valve, air system, flue gas system, high-temperature air burning device, pneumatic operated valve；
Middle top in the gas-fired cupola is equipped with fusing preheating section；
The high-temperature air burning device is located at the lower section of gas-fired cupola, and the eight ways valve is located at outside gas-fired cupola, and position
In the upper side of fusing preheating section；
The air system and flue gas system are connect with eight ways valve respectively, and the air system includes cold air pipe and high temperature air
Pipe；
The flue gas system includes chimney and high-temperature flue gas pipe；
The eight ways valve includes hot end four-way valve, heat storage group and cold end four-way valve, the hot end four-way valve, cold end four-way valve point
Not Wei Yu the heat storage group two sides；One end of the high-temperature flue gas pipe is connect with hot end four-way valve, and the other end and combustion gas are rushed
The connection of its furnace；One end of chimney is connect with cold end four-way valve, and the other end is communicated with the atmosphere；One end of the cold air pipe and atmosphere
Connection is connected with blower, and the other end is connect with cold end four-way valve；High temperature air pipe one end is connect with hot end four-way valve, separately
One end is connect with high-temperature air burning device；
The pneumatic operated valve is located on hot end four-way valve and cold end four-way valve.
2. gas-fired cupola typed high temperature air burning device according to claim 1, it is characterised in that: the gas-fired cupola
Typed high temperature air burning device further comprises smoke-detecting plant, and the smoke-detecting plant is located at the outside of eight ways valve, including
CO sensor and two probe tubes, are respectively equipped with solenoid valve on two probe tubes；One end of one probe tube is connected to chimney,
The other end is connect with CO sensor, and one end of another probe tube is connected to high-temperature flue gas pipe, and the other end is connect with CO sensor；
Flue gas Venturi tube is respectively equipped on the chimney, high-temperature flue gas pipe；In the cold air pipe, high temperature air Guan Shangfen
Not She You air venturi, changed by the pressure difference of CO content in smoke and Venturi tube and two-parameter determine switching valve
Sealing performance, such cold end four-way valve, hot end four-way valve switching valve can examine transition effect and valve sealing performance.
3. gas-fired cupola typed high temperature air burning device according to claim 2, it is characterised in that: the heat storage group packet
Air side heat storage, fume side heat storage and partition are included, the air side heat storage is connected to air system, and the fume side stores
Hot body is connected to flue gas system；
The air side heat storage and fume side heat storage are composed of muti-piece honeycomb heat accumulation body, the honeycomb heat accumulation body tool
There are rectangular, round or polygonal shaped channels, the channel of the honeycomb heat accumulation body on air side heat storage and partition form air duct, cigarette
The channel of honeycomb heat accumulation body on the heat storage of gas side and partition form exhaust gases passes.
4. gas-fired cupola typed high temperature air burning device according to claim 3, it is characterised in that: the hot end four-way valve
Including valve chamber and the four sets of hot-swap valves, partition and the four sets of pneumatic operated valves being arranged in outside valve chamber that are arranged in valve chamber, Yi Taore
Switching valve corresponds to a set of pneumatic operated valve；State the opening and closing that the pneumatic operated valve controls hot-swap valve by controller, the partition
Air system and flue gas system are divided into different airflow channels；
Four sets of hot-swap valves are located at the upper left corner, the lower left corner, the upper right corner and the lower right corner in valve chamber, make in pairs
With, i.e., if the hot-swap valve in the upper left corner and the lower right corner is closed, the hot-swap valve in the lower left corner and the upper right corner is opened, if instead
The hot-swap valve in the lower left corner and the upper right corner is closed, then the hot-swap valve in the upper left corner and the lower right corner is opened；
Hot-swap valve described in every set include the thermal valve seat with palace type seal groove, the thermal valve lid with palace type seal groove, sliding bearing,
Refractory matter, support tube, axis thermocouple, hollow shaft, fixed pin and seal plug；
It is equipped with valve passage at the center of the thermal valve seat, the outer rim of thermal valve seat is fixed on the partition, the thermal valve Gai Yure
Valve seat uses in pairs, above or below thermal valve seat, to guarantee hot-swap valve closing movement direction and flue gas or air stream
Dynamic direction is identical；
It covers in the thermal valve equipped with valve cover hole, one end of the hollow shaft is fixed on the valve cover hole by the fixed pin
Interior, the other end of hollow shaft is connected after stretching out valve chamber with a set of pneumatic operated valve, while being fixed with the axis thermocouple at the end；
The hollow shaft is hollow structure, its at thermal valve lid be equipped with air port；
One end of the sliding bearing is fixed on the valve chamber, and be located at hollow shaft outside, to hollow shaft carry out positioning and
Support；
The support tube is located at the outside of sliding bearing, and is connected with partition；
The refractory matter is located at the outside of support tube.
5. gas-fired cupola typed high temperature air burning device according to claim 4, it is characterised in that: the cold end four-way valve
Including valve chamber and the four sets of cold switching valves, partition and the four sets of pneumatic operated valves being arranged in outside valve chamber that are arranged in valve chamber, Yi Taoleng
Switching valve corresponds to a set of pneumatic operated valve；The pneumatic operated valve controls the opening and closing of cold switching valve by controller, and the partition will
Air system and flue gas system are divided into different airflow channels；
Four sets of cold switching valves are located at the upper left corner, the lower left corner, the upper right corner and the lower right corner in valve chamber, make in pairs
With, i.e., if the cold switching valve in the upper left corner and the lower right corner is closed, the cold switching valve in the lower left corner and the upper right corner is opened, if instead
The cold switching valve in the lower left corner and the upper right corner is closed, then the cold switching valve in the upper left corner and the lower right corner is opened；
Cold switching valve described in every set includes the low temperature valve seat with palace type seal groove, low temperature valve lid, fixed pin, valve with palace type seal groove
Axis and seal plug；
It is equipped with valve passage at the center of the low temperature valve seat, the outer rim of low temperature valve seat is fixed on the partition, the low temperature valve Gai Yuleng
Valve seat uses in pairs, above or below low temperature valve seat；
It covering in the low temperature valve equipped with valve cover hole, one end of the valve shaft is fixed in the valve cover hole by the fixed pin,
The other end of valve shaft is connected after stretching out valve chamber with a set of pneumatic operated valve；
One end of the sliding bearing is fixed on the valve chamber, and is located at the outside of valve shaft, is positioned and is supported to valve shaft；
The support tube is located at the outside of sliding bearing, and is connected with partition.
6. gas-fired cupola typed high temperature air burning device according to claim 5, it is characterised in that: the palace type seal groove
On hot-swap valve and cold switching valve, the palace type seal groove that thermal valve lid and low temperature valve cover is raised line, on thermal valve seat and low temperature valve seat
Palace type seal groove be palace type seal groove that groove or thermal valve lid and low temperature valve cover be groove, on thermal valve seat and low temperature valve seat
Palace type seal groove is raised line, and the two cooperation is pairs of；
The direction of motion when hot-swap valve and cold switching valve are closed is identical as the air current flow direction of flue gas or air.
7. gas-fired cupola typed high temperature air burning device according to claim 6, it is characterised in that: the seal plug installation
Above or below the valve cover hole of thermal valve lid and low temperature valve lid, corresponding hollow shaft and valve shaft draw from the below or above of valve cover hole
Out, the mountable any end in thermal valve lid or the axis hole of low temperature valve lid of seal plug realizes different valve shaft installations, and realizes heat
The leakproofness of valve deck.
8. gas-fired cupola typed high temperature air burning device according to claim 7, it is characterised in that: preheated in the fusing
The top of section is equipped with feeding seal valve.
9. gas-fired cupola typed high temperature air burning device according to claim 8, it is characterised in that: the air system into
One step includes air branch pipe, air solenoid valve and air port；
The air branch pipe is connected with the hollow shaft, and the air solenoid valve is installed in the air branch pipe；
The flue gas system further comprises smoke evacuation thermocouple, and the smoke evacuation thermocouple is located in chimney；
The hot-swap valve material is heat-resisting cast iron or heat-resisting alloy steel, and the cold switching valve is plain cast iron；
The gas-fired cupola typed high temperature air burning device further comprises controller, realizes the behaviour to eight ways valve by controller
Make；
The movement of the controller control pneumatic operated valve, air solenoid valve, solenoid valve, and receive CO sensor, air venturi,
There is logic to execute switching valve and follow for the temperature signal of the pressure signal and axis thermocouple of flue gas Venturi tube, thermocouple of discharging fume
Ring cutting changes, identify switching valve whether sealing performance function and control the function of smog discharge temperature.
10. high using the gas-fired cupola that any gas-fired cupola typed high temperature air burning device of claim 1 to 9 is realized
Warm air combustion method, it is characterised in that: the described method includes:
(1) high temperature air enters high-temperature air burning device from high temperature air pipe and burns with combustion gas, the high temperature cigarette for generation of burning
Gas enters pre- heat fusing section；
(2) after the high-temperature flue gas pipe of the upper side of the preheated fusing section of flue gas enters hot end four-way valve, into the cigarette of heat storage group
After the heat storage of gas side, after entering back into cold end four-way valve, it is discharged in atmosphere by chimney；
(3) simultaneously, air is after cold air pipe enters cold end four-way valve, into air side heat storage, then enters hot end four-way
Valve enters back into high temperature air pipe；
(4) when the flue-gas temperature signal via controller identification for thermocouple of discharging fume is lower than 150 ± 10 DEG C, controller is sent out to pneumatic operated valve
4 hot-swap valves of signal switching hot end four-way valve out, while switching 4 cold switching valves of cold end four-way valve so that flue gas into
Enter air side heat storage, and air enters fume side heat storage；
(5) when via controller identification is lower than 150 ± 10 DEG C again for the flue-gas temperature signal for thermocouple of discharging fume, controller is to pneumatic
Valve issues signal switching hot-swap valve and cold switching valve again, recycles progress with this；
(6) pressure signal of air venturi and flue gas Venturi tube is detected, and is stored in controller；
(7) solenoid valve by controller on probe tube carries out interval switching, realizes from high-temperature flue gas pipe and stack sampling, warp
The concentration signal that CO biosensor analysis obtains is stored in controller；
(7) according to the pressure signal and concentration signal being stored in controller, judge the sealing journey of hot-swap valve and cold switching valve
Degree；
(8) when axis thermocouple, which detects hollow shaft temperature, is more than 100 ± 10 DEG C, controller commands the air electricity in air branch pipe
Magnet valve is opened, and air enters hollow shaft, is most discharged afterwards through air ejiction opening, realizes the cooling to hollow shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610615668.6A CN107314665B (en) | 2016-07-29 | 2016-07-29 | A kind of gas-fired cupola typed high temperature air burning device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610615668.6A CN107314665B (en) | 2016-07-29 | 2016-07-29 | A kind of gas-fired cupola typed high temperature air burning device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107314665A CN107314665A (en) | 2017-11-03 |
| CN107314665B true CN107314665B (en) | 2019-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610615668.6A Expired - Fee Related CN107314665B (en) | 2016-07-29 | 2016-07-29 | A kind of gas-fired cupola typed high temperature air burning device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114046657A (en) * | 2021-11-16 | 2022-02-15 | 重庆本通机械设备有限公司 | Energy-saving hot melting stove |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB697979A (en) * | 1950-09-25 | 1953-10-07 | Robert Andre Marcel Ronceray | Foundry cupola |
| CN2475890Y (en) * | 2001-04-16 | 2002-02-06 | 温州市东海化纤设备厂 | Sleeve four-way valve |
| CN101726175A (en) * | 2009-12-08 | 2010-06-09 | 赵文鹤 | Heat accumulating type external heat blast cupola furnace |
| CN204495037U (en) * | 2015-03-04 | 2015-07-22 | 富阳怀邦机械有限公司 | A kind of gas-fired cupola of circular vertical |
| CN205352106U (en) * | 2016-01-14 | 2016-06-29 | 山西金星镁业有限公司 | Magnesium metal heat accumulation formula smelting furnace waste heat utilization equipment |
-
2016
- 2016-07-29 CN CN201610615668.6A patent/CN107314665B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB697979A (en) * | 1950-09-25 | 1953-10-07 | Robert Andre Marcel Ronceray | Foundry cupola |
| CN2475890Y (en) * | 2001-04-16 | 2002-02-06 | 温州市东海化纤设备厂 | Sleeve four-way valve |
| CN101726175A (en) * | 2009-12-08 | 2010-06-09 | 赵文鹤 | Heat accumulating type external heat blast cupola furnace |
| CN204495037U (en) * | 2015-03-04 | 2015-07-22 | 富阳怀邦机械有限公司 | A kind of gas-fired cupola of circular vertical |
| CN205352106U (en) * | 2016-01-14 | 2016-06-29 | 山西金星镁业有限公司 | Magnesium metal heat accumulation formula smelting furnace waste heat utilization equipment |
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| CN107314665A (en) | 2017-11-03 |
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Effective date of registration: 20200617 Address after: 214191 a-109, building 9, Dongfang Steel City Phase II, Xishan District, Wuxi City, Jiangsu Province Patentee after: Wuxi jinwanquan Stainless Steel Co.,Ltd. Address before: 210048 Jiangsu city of Nanjing Province along the Yangtze River Industrial Development Zone geguan Road No. 703, building 2, room 3104, embroidered King Nga Court Patentee before: NANJING LIUQUAN NEW ENERGY TECHNOLOGY Co.,Ltd. |
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Granted publication date: 20190222 |