CN104004985A - Carbon-nitrogen-oxygen combined treatment process and device - Google Patents
Carbon-nitrogen-oxygen combined treatment process and device Download PDFInfo
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- CN104004985A CN104004985A CN201410243622.7A CN201410243622A CN104004985A CN 104004985 A CN104004985 A CN 104004985A CN 201410243622 A CN201410243622 A CN 201410243622A CN 104004985 A CN104004985 A CN 104004985A
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Abstract
The invention relates to a carbon-nitrogen-oxygen combined treatment process and device. The process comprises previous cleaning, preheating, nitrocarburizing, oxidizing, waste gas treatment and later cleaning, wherein the waste gas treatment comprises the following steps: 1, introducing poisonous gas in a nitriding furnace into an oxidizing furnace for performing detoxifying treatment; 2, introducing gas in the oxidizing furnace into an absorption tower for performing spraying treatment, and achieving emission on standard. The invention also relates to a carbon-nitrogen-oxygen combined treatment device which comprises a preheating furnace, the nitriding furnace, the oxidizing furnace and a waste gas purification treatment device, wherein the nitriding furnace is communicated with the oxidizing furnace through a first fan and a first pipeline; the oxidizing furnace is communicated with the waste gas purification treatment device through a second fan and a second pipeline; gases in the nitriding furnace enter the oxidizing furnace and are purified through the waste gas purification treatment device for emission. The process and the device have the advantages of high waste gas treatment efficiency, stable process, short aging and high yield, the equipment is simple and practical, and reduction, harmlessness and reclamation in the whole technical process are realized.
Description
Technical field
The present invention relates to surface heat processing technology field, relate in particular to a kind of nitrogen carbon oxygen composite treatment process and device.
Background technology
In order to improve the hardness, wear resistance, erosion resistance etc. of metal works, conventionally need, by workpiece surface coating, surface modification or composite treatment technology, to change form, chemical composition, weave construction and the stressed condition of workpiece surface, to obtain desired properties, in machinofacture process, mainly still adopt nitriding, the heat treatment mode such as carburizing and oxidation, but conventionally metal works is only carried out to single heat treatment technics, improve workpiece wear resistance or solidity to corrosion, such as nitriding, it is in certain medium, to make nitrogen-atoms infiltrate the chemical heat treatment process of workpiece surface at a certain temperature, common nitridation process has liquid nitriding, gas nitriding, ionitriding, workpiece nitriding is normally carried out in salt bath, residual a small amount of nitridation salt on the workpiece of via nitride salt bath, in nitridation salt, contain poisonous cyanogen root, therefore the rear workpiece of nitrogenize salt bath and all will put into the oxidized still processing of detoxifying from the slag of pulling out in nitriding furnace, also improved the erosion resistance of workpiece surface simultaneously, and separate between nitriding furnace and oxidized still in traditional technological process, owing to can produce ammonia in nitriding or oxidising process, waste gas and the dust such as the steam of poisonous prussic acid gas and saline solution volatilization, for the processing of this waste gas and dust, traditional mode does not separate and pre-treatment with dust waste gas, and arrange cylinder smoke stack emission through height after directly waste gas being sprayed by absorption tower, wherein a part of toxic gas fails to obtain fully neutralization removing toxic substances, contaminate environment, and in dust, contain nitridation salt or saline oxide, the price comparison of nitridation salt and saline oxide is high, in treating processes, it is not carried out to recycling, cause the wasting of resources and nitridation salt and saline oxide soluble in water in, can cause secondary pollution to environment.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of nitrogen carbon oxygen composite treatment process is provided, to the processing of detoxifying in the toxic gas introducing oxidized still producing in carbonitriding process, again by the qualified discharge after spray is processed of the gas in oxidized still, in this technological process, the gas in nitriding furnace and oxidized still is taken off respectively to dirt processing simultaneously, in the extremely corresponding nitriding furnace of dust difference reuse or oxidized still of collecting, whole technological process minimizing, innoxious, resource utilization.
The scheme that the present invention solve the technical problem is: a kind of nitrogen carbon oxygen composite treatment process, comprise front cleaning, preheating, carbonitriding, oxidation, rear cleaning and off gas treatment, workpiece after being installed is first after the degreasing of metal cleaner solution, cold water cleaning and hot water clean, in preheating oven, carry out thermal pretreatment, hang in subsequently and in nitriding furnace, carry out carbonitriding processing, then enter and in oxidized still, carry out oxide treatment, then enter and in hot water tank, be incubated processing, cooling in air, dry more afterwards, it is characterized in that, described off gas treatment step is:
First step: will introduce containing poisonous gas the processing of detoxifying in described oxidized still in described nitriding furnace;
Second step: the gas in oxidized still is introduced to absorption tower spray and process rear qualified discharge.
As improvement, described containing the residence time of poisonous gas in oxidized still be 0.5min～5min, the temperature in described oxidized still is 350 DEG C～450 DEG C.
As improvement, the described poisonous gas that contains took off dirt processing before entering described first step, and the dust obtaining after the described first de-dirt processing is collected, and reuse is to described carbonitriding step.
As improvement, the gas in described oxidized still was taken off before entering described second step to dirt processing, and the dust obtaining after described de-dirt processing is collected, reuse is to described oxidation step.
In this technological process in nitriding furnace is the ammonia that produces in workpiece carbonitriding process and a small amount of prussic acid gas containing a poisonous gas part, and prussic acid gas is poisonous, needs removing toxic substances to process; Another part is in nitriding furnace, supplement base salt or adjust in salt process, a large amount of ammonias that produce when base salt or adjustment salt high temperature melting, steam and the dust of saline solution volatilization; The sense of smell of ammonia intense stimulus, can not make uncontrollable discharge, in the steam of saline solution volatilization, contains poisonous cyanogen root, the processing of need to detoxifying; Dust mainly comprises the steam of saline solution volatilization and the powder of the nitridation salt extracted out by exhaust system when adding base salt or adjust salt in nitriding furnace, above-mentioned toxic gas takes off to introduce after dirt is processed and be oxidized removing toxic substances in oxidized still and process, simultaneously the dust of collection can reuse to nitriding furnace; Gas in oxidized still is mainly the steam of waste gas after oxidation removing toxic substances of toxic gas in nitriding furnace and saline solution volatilization when adding base salt in oxidized still, gas after de-dirt is processed, introduce absorption tower spray and process after qualified discharge, the dust of simultaneously collecting can reuse to oxidized still; Gas in nitriding furnace is introduced directly in the saline solution of oxidized still, and gas has certain stirring action to saline solution on the one hand, makes oxidized still furnace temperature more even, improves on the other hand the abundant oxidized salt liquid oxidation removing toxic substances of cyanogen root in gas, improves decontamination effect improving.
Another object of the present invention is to provide a kind of nitrogen carbon oxygen composite handling arrangement, and this apparatus structure is reasonable in design, economical and practical, output is high, stable performance, and waste-gas cleaning treatment effect is good and efficiency is high.
The scheme that the present invention solve the technical problem is:
A kind of nitrogen carbon oxygen composite handling arrangement, comprise preheating oven, nitriding furnace, oxidized still and exhaust gas purification and treatment device, described preheating oven, nitriding furnace and oxidized still are external-heat crucible electrical resistance furnace, it is characterized in that, the venting port of described nitriding furnace and the inlet mouth of described oxidized still are connected by the first blower fan and the first pipeline; The air outlet of described oxidized still is communicated with described exhaust gas purification and treatment device by the second blower fan and second pipe; Gas in described nitriding furnace discharges after entering in oxidized still after exhaust gas purification and treatment device purifying treatment.
As improvement, described the first pipeline is provided with for to the fume dust remover that is taken off dirt processing by nitriding furnace venting port expellant gas, the inlet mouth of this fume dust remover is communicated with the venting port of described nitriding furnace, and its air outlet is communicated with the inlet mouth of described oxidized still.
As improvement, described second pipe is provided with the fume dust remover for expellant gas in oxidized still being taken off to dirt processing, the inlet mouth of this fume dust remover is communicated with the venting port of described oxidized still, and its air outlet is communicated with described exhaust gas purification and treatment device.
As improvement, described fume dust remover entirety is one to have the dust settling chamber of cavity structure, the forward and backward two sides of this dust settling chamber offer respectively inlet mouth and air outlet, between inlet mouth and air outlet, be tiltedly installed with flue dust baffle plate, under this flue dust baffle plate, be also provided with the retrieving arrangement for collecting the dust being fallen by described flue dust baffle plate, gas is discharged by air outlet after inlet mouth enters dust settling chamber after flue dust baffle plate flows.
As improvement, on described the first pipeline and second pipe, be also provided with respectively rotary air channel, this rotary air channel comprises the restrained line and the rotatable pipeline that are connected; The venting port of one end of described restrained line and described nitriding furnace or oxidized still is connected, and one end of its other end and described rotatable pipeline is rotationally connected, and the other end of this rotatable pipeline is communicated with the inlet mouth of corresponding fume dust remover.
As improvement, described exhaust gas purification and treatment device comprises the first absorption tower, second absorption tower and exhausting blower fan, and this exhausting blower fan is arranged between the first absorption tower and second absorption tower, and described the first absorption tower communicates with described the second blower fan.
The invention has the beneficial effects as follows:
(1) the present invention is without pass into pressurized air in nitriding furnace, and process stabilizing, timeliness be short, realize advantages of nontoxic raw materials.
(2) gas in carbonitriding step is introduced the processing of detoxifying in oxidized still after de-dirt is processed, qualified discharge after gas in oxidized still concentrates introducing absorption tower spray to process after de-dirt is processed again, adopt the compound of carbonitriding operation and oxidation operation, technique is simple, waste-gas cleaning is effective, realizes discharge nontoxic.
(3) in the gas in nitriding furnace and oxidized still obtains respectively after de-dirt is processed the extremely corresponding nitriding furnace of dust reuse or oxidized still, resource recycling, energy-conserving and environment-protective.
The advantages such as in sum, simple in structure, economical and practical and equipment performance that the present invention has is stable, reliability is high, and waste-gas cleaning processing efficiency is high, effective.
Brief description of the drawings
Fig. 1 is the process flow sheet of nitrogen carbon oxygen composite treatment process of the present invention;
Fig. 2 is the structural representation of nitrogen carbon oxygen composite handling arrangement of the present invention;
Fig. 3 is the structural representation of nitriding furnace of the present invention;
Fig. 4 is the structural representation in the rotary air channel of the present invention;
Fig. 5 is the structural representation of oxidized still of the present invention;
Fig. 6 is the internal structure schematic diagram of oxidized still of the present invention;
Fig. 7 is the structural representation of fume dust remover of the present invention.
In figure: 1, preheating oven; 2, nitriding furnace; 21, sleeve; 211, air inlet port; 212, production well; 22, salt adding mouth; 23, gas channel; 3, oxidized still; 31, gas flow tube; 32, bell; 321, inlet mouth a; 322, air outlet a; 33, gas passage; 331, inlet mouth b, 332, air outlet b; 333, inlet pipe; 334, escape pipe; 4, exhaust gas purification and treatment device; 41, the first absorption tower; 42, second absorption tower; 43, exhausting blower fan; 5, the first blower fan; 6, the first pipeline; 7, the second blower fan; 8, second pipe; 9, rotary air channel; 91, restrained line; 92, rotatable pipeline; 10, fume dust remover; 101, dust settling chamber; 102, retrieving arrangement; 103, inlet mouth; 104, air outlet; 105, flue dust baffle plate; 11, variable valve.
Embodiment
Below in conjunction with embodiment, the present invention will be further described.
Embodiment 1
As shown in Figure 1, a kind of nitrogen carbon oxygen composite treatment process, comprise front cleaning, preheating, carbonitriding, oxidation, rear cleaning and off gas treatment, workpiece after being installed is first through the degreasing of metal cleaner solution, after cold water cleaning and hot water clean, in being the preheating oven 1 of 350 DEG C～400 DEG C, temperature carries out thermal pretreatment, hang in subsequently temperature and be in the nitriding furnace 2 of 400 DEG C～550 DEG C and carry out carbonitriding processing, base salt cyanate radical content in nitriding furnace 2 is controlled at 33%～38% scope, then enter and in oxidized still 3, carry out oxide treatment, oxidization time is 10min～60min, then enter temperature and be in the hot water tank of 70 DEG C～80 DEG C and be incubated 10min～20min, cooling in air more afterwards, dry, described off gas treatment step is: first step: will in described nitriding furnace 2, introduce containing poisonous gas the processing of detoxifying in described oxidized still 3, second step: the gas in oxidized still 3 is introduced to absorption tower spray and process rear qualified discharge.
Described is the interior stop of the oxidized still 3 0.5min～5min of 350 DEG C～450 DEG C in temperature containing poisonous gas.
Describedly before entering described first step, take off dirt processing containing poisonous gas, and the dust obtaining after the described first de-dirt is processed collects, the nitridation salt obtaining after dust disposal can reuse extremely in described carbonitriding step.
Gas in described oxidized still 3 was taken off to dirt processing before entering described second step, and the dust obtaining after described de-dirt is processed collects, the saline oxide obtaining after dust disposal can reuse to described oxidation step.
In this technological process because workpiece is taken out of, workpiece reacts with salt bath and the factor such as salt bath volatilization, the volume of the oxidation salt bath in the interior nitrogenize salt bath of nitriding furnace 2 and oxidized still 3 can reduce gradually, liquid level can decline, and need in stove, add corresponding base salt and adjust salt, rising salt bath liquid level; In described nitriding furnace 2 is the ammonia that produces in workpiece carbonitriding process and a small amount of prussic acid gas containing a poisonous gas part, and wherein, prussic acid gas is poisonous, needs removing toxic substances to process; Another part is the interior supplementary base salt of nitriding furnace 2 or adjusts in salt process, the a large amount of ammonias that produce when base salt or adjustment salt high temperature melting, steam and the dust of saline solution volatilization, wherein, a large amount of ammonia intense stimulus sense of smell, can not make uncontrollable discharge, in the steam of saline solution volatilization, contain poisonous cyanogen root, discharge content should be within national environmental standard permissible value, the processing of need to detoxifying; Dust mainly comprises the steam of saline solution volatilization and the powder of the nitridation salt extracted out by exhaust system to nitriding furnace 2 interior interpolation base salt or while adjusting salt.
Gas in oxidized still 3 is mainly the steam of waste gas after oxidation removing toxic substances of toxic gas in nitriding furnace 2 and saline solution volatilization during to the interior interpolation base of oxidized still 3 salt, gas need be introduced absorption tower spray again and process qualified discharge, process stabilizing, simple after de-dirt is processed.
As shown in Figure 2, a kind of nitrogen carbon oxygen composite handling arrangement, comprises preheating oven 1, nitriding furnace 2, oxidized still 3 and exhaust gas purification and treatment device 4, and described preheating oven 1, nitriding furnace 2 and oxidized still 3 are external-heat crucible electrical resistance furnace, preheating oven 1 bottom is provided with fan, makes workpiece preheating more even; The inlet mouth of the venting port of described nitriding furnace 2 and described oxidized still 3 is connected by the first blower fan 5 and the first pipeline 6; The air outlet of described oxidized still 3 is communicated with described exhaust gas purification and treatment device 4 by the second blower fan 7 and second pipe 8; Gas in described nitriding furnace 2 enters oxidized still 3 and after exhaust gas purification and treatment device 4 purifying treatment, discharges after interior.
As shown in Figure 3 and Figure 4, in described nitriding furnace 2 bodies of heater, be provided with positive tapered sleeve 21, the salt adding mouth 22 that these sleeve 21 upper ends are arranged on bell goes out, and bottom deeply, to nitridation salt solution, seals between these salt adding mouth 22 bottoms and sleeve 21 outer walls; Described sleeve 21 lower sides offer some air inlet ports 211, sleeve 21 upper portion side wall offer some production wells 212, and form annular gas channel 23 between these sleeve 21 tops and described salt adding mouth 22, in carbonitriding process, need to or adjust salt to nitriding furnace 2 interior interpolation base salt, base salt or adjustment salt are thrown in to solution along sleeve 21, when melting, discharge a large amount of poisonous gas that contains, the air inlet port 211 of being offered by sleeve 21 bottoms containing poisonous gas enters in sleeve 21, and the production well 212 of offering by sleeve 21 tops is successively in gas channel 23 enters the first pipeline 6; Described the first pipeline 6 is provided with and comprises the restrained line 91 that is connected and the rotary air channel 9 of rotatable pipeline 92, one end of described restrained line 91 is communicated with the gas channel 23 on described nitriding furnace 2, one end of its other end and described rotatable pipeline 92 is rotationally connected, and restrained line 91 can relatively rotate along with the folding of bell and rotatable pipeline 92; On described the first pipeline 6, be also provided with for to taking off the fume dust remover 10 of dirt processing by nitriding furnace 2 interior discharges containing poisonous gas, the inlet mouth 103 of this fume dust remover 10 is communicated with the other end of rotatable pipeline 92, and the de-dirt of gas introduces by the first blower fan 5 processing of detoxifying in oxidized still 3 through its air outlet 104 after processing.
As shown in Figure 5 and Figure 6, described oxidized still 3 comprises that one is arranged in body of heater for extraneous gas being introduced to the gas flow tube 31 and the gas passage 33 that is set in bell outside in solution, gas flow tube 31 upper ends communicate with the inlet mouth a321 offering on bell 32 sidewalls, and its bottom stretches in solution, the inlet mouth b331 offering on described gas passage 33 is corresponding with described inlet mouth a321 and be connected with described gas flow tube 31, and inlet mouth b331 is near inlet pipe 333 places of gas passage 33, on described bell 32 sidewalls, offer some air outlet a322, gas passage 33 inner side-walls offer some and described air outlet a322 air outlet b332 one to one, described second pipe 8 is provided with and comprises the restrained line 91 that is connected and the rotary air channel 9 of rotatable pipeline 92, the escape pipe 334 of one end of described restrained line 91 and described gas passage 33 is connected, one end of the other end of described restrained line 91 and described rotatable pipeline 92 is rotationally connected, and restrained line 91 can relatively rotate along with the folding of bell 32 and rotatable pipeline 92, described second pipe 8 is provided with the fume dust remover 10 for the interior expellant gas of oxidized still 3 being taken off to dirt processing, the inlet mouth 103 of this fume dust remover 10 is communicated with the other end of rotatable pipeline 92, and its air outlet 104 is communicated with exhaust gas purification and treatment device 4 by the second blower fan 7, described exhaust gas purification and treatment device 4 comprises the first absorption tower 41, second absorption tower 42 and exhausting blower fan 43, this exhausting blower fan 43 is arranged between the first absorption tower 41 and second absorption tower 42, described the first absorption tower 41 communicates with described the second blower fan 7, the first absorption tower 41 and second absorption tower 42 inside are provided with spray equipment, the gases such as the steam that the waste gas after the interior oxidation removing toxic substances of oxidized still 3 volatilizees together with saline oxide saline solution containing poisonous gas of nitriding furnace 2 interior discharges enter fume dust remover 10 through rotating channel and take off after dirt processing, be incorporated in described the first absorption tower 41 and once spray by the second blower fan 7, remaining gas is incorporated in described second absorption tower 42 and is carried out secondary spraying by exhausting blower fan 43, gas is qualified discharge after double-absorption tower purifies, the waste water producing is recycled.
As shown in Figure 7, described fume dust remover 10 entirety are one to have the dust settling chamber 101 of cavity structure, in dust settling chamber 101, be provided with retrieving arrangement 102, the forward and backward two sides of dust settling chamber 101 offer respectively inlet mouth 103 and air outlet 104, between inlet mouth 103 and air outlet 104, are tiltedly installed with flue dust baffle plate 105; Described retrieving arrangement 102 is arranged under described flue dust baffle plate 105, and for collecting the dust being fallen by described flue dust baffle plate 105, gas is discharged by air outlet 104 after inlet mouth 103 enters dust settling chamber 101 after flue dust baffle plate 105 flows.
Described nitriding furnace 2 quantity are two, employing is connected in parallel, the air outlet 104 of the fume dust remover 10 that every nitriding furnace 2 connects is all connected with the blast inlet of the first blower fan 5, and be equipped with a variable valve 11 on the first pipeline 6 connecting, control two nitriding furnace 2 alternations by variable valve 11, because the soaking time of nitriding furnace 2 is grown more than one times than preheating oven 1 and oxidized still 3, adopt two nitriding furnaces 2 in the situation that not increasing other equipment, output doubles.
Claims (10)
1. a nitrogen carbon oxygen composite treatment process, comprise front cleaning, preheating, carbonitriding, oxidation, rear cleaning and off gas treatment, workpiece after being installed is first after the degreasing of metal cleaner solution, cold water cleaning and hot water clean, in preheating oven, carry out thermal pretreatment, hang in subsequently and in nitriding furnace, carry out carbonitriding processing, then enter and in oxidized still, carry out oxide treatment, then enter and in hot water tank, be incubated processing, cooling in air, dry more afterwards, it is characterized in that, described off gas treatment step is:
First step: will introduce containing poisonous gas the processing of detoxifying in described oxidized still in described nitriding furnace;
Second step: the gas in oxidized still is introduced to absorption tower spray and process rear qualified discharge.
2. a kind of nitrogen carbon oxygen composite treatment process as claimed in claim 1, is characterized in that, described containing the residence time of poisonous gas in oxidized still be 0.5min～5min, the temperature in described oxidized still is 350 DEG C～450 DEG C.
3. a kind of nitrogen carbon oxygen composite treatment process as claimed in claim 1, it is characterized in that, the described poisonous gas that contains took off dirt processing before entering described first step, and the dust obtaining after the described first de-dirt processing is collected, and reuse is to described carbonitriding step.
4. a kind of nitrogen carbon oxygen composite treatment process as claimed in claim 1, it is characterized in that, gas in described oxidized still was taken off before entering described second step to dirt processing, and the dust obtaining after described de-dirt processing is collected, reuse is to described oxidation step.
5. a nitrogen carbon oxygen composite handling arrangement, comprise preheating oven, nitriding furnace, oxidized still and exhaust gas purification and treatment device, described preheating oven, nitriding furnace and oxidized still are external-heat crucible electrical resistance furnace, it is characterized in that, the venting port of described nitriding furnace and the inlet mouth of described oxidized still are connected by the first blower fan and the first pipeline; The air outlet of described oxidized still is passed through the second blower fan and second pipe and described exhaust gas purification and treatment device and is connected, and the gas in nitriding furnace discharges after entering in oxidized still after exhaust gas purification and treatment device purifying treatment.
6. a kind of nitrogen carbon oxygen composite handling arrangement as claimed in claim 5, it is characterized in that, described the first pipeline is provided with for to the fume dust remover that is taken off dirt processing by nitriding furnace venting port expellant gas, the inlet mouth of this fume dust remover is communicated with the venting port of described nitriding furnace, and its air outlet is communicated with the inlet mouth of described oxidized still.
7. a kind of nitrogen carbon oxygen composite handling arrangement as claimed in claim 5, it is characterized in that, described second pipe is provided with the fume dust remover for expellant gas in oxidized still being taken off to dirt processing, the inlet mouth of this fume dust remover is communicated with the venting port of described oxidized still, and its air outlet is communicated with described exhaust gas purification and treatment device.
8. a kind of nitrogen carbon oxygen composite handling arrangement as described in claim 6 or 7, it is characterized in that, described fume dust remover entirety is one to have the dust settling chamber of cavity structure, the forward and backward two sides of this dust settling chamber offer respectively inlet mouth and air outlet, between inlet mouth and air outlet, be tiltedly installed with flue dust baffle plate, gas is discharged by air outlet after inlet mouth enters dust settling chamber after flue dust baffle plate flows.
9. a kind of nitrogen carbon oxygen composite handling arrangement as claimed in claim 5, is characterized in that, on described the first pipeline and second pipe, be also provided with respectively rotary air channel, this rotary air channel comprises the restrained line and the rotatable pipeline that are connected; The venting port of one end of described restrained line and described nitriding furnace or oxidized still is connected, and one end of its other end and described rotatable pipeline is rotationally connected, and the other end of this rotatable pipeline is communicated with the inlet mouth of corresponding fume dust remover.
10. a kind of nitrogen carbon oxygen composite handling arrangement as claimed in claim 5, it is characterized in that, described exhaust gas purification and treatment device comprises the first absorption tower, second absorption tower and exhausting blower fan, this exhausting blower fan is arranged between the first absorption tower and second absorption tower, and described the first absorption tower communicates with described the second blower fan.
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| CN105483605A (en) * | 2015-12-09 | 2016-04-13 | 常州大学 | Ion nitrocarburizing and ion nitriding composite surface modification treatment method |
| CN105543771A (en) * | 2016-02-22 | 2016-05-04 | 浙江尚鼎工业炉有限公司 | Cleaning type continuous nitrogen-carbon-oxygen composite treatment system |
| CN105543772A (en) * | 2016-02-22 | 2016-05-04 | 浙江尚鼎工业炉有限公司 | Nitrogen, carbon and oxygen continuous composite treatment system |
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Effective date of registration: 20191209 Address after: 314300, No. 97, Qinshan Road, Qinshan street, Haiyan County, Zhejiang, Jiaxing Patentee after: Jiaxing lechuang fastener Technology Co., Ltd Address before: 313100, Zhejiang, Huzhou Changxing County forest town industrial concentration area Patentee before: Zhejiang Shangding Industrial Furnace Co., Ltd. |