CN103643199B - A kind of Pressure nitrogenization furnace - Google Patents
A kind of Pressure nitrogenization furnace Download PDFInfo
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- CN103643199B CN103643199B CN201310677423.2A CN201310677423A CN103643199B CN 103643199 B CN103643199 B CN 103643199B CN 201310677423 A CN201310677423 A CN 201310677423A CN 103643199 B CN103643199 B CN 103643199B
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Abstract
The invention discloses a kind of Pressure nitrogenization furnace, it is characterized in that, comprise the retort and pressure electrothermal oven that cooperatively interact, described retort comprises cover, the tank being with tank flange and heat preservation module, and described heat preservation module is fixed on the bottom of cover and makes dead in line; Described pressure electrothermal oven comprises flanged (FLGD) furnace shell, blind flange and heating module, and described flange is positioned at furnace shell upper end, corresponding with blind flange, and described heating module is positioned at furnace shell inside.The present invention adopts the technology of dual seal, achieves the elevated-temperature seal between retort and pressure electrothermal oven and separating at high temperature, avoids the difficulty that reaction tank skin bears high temperature and high pressure simultaneously simultaneously.This creates good condition for cooling fast, need not wait for that the cooling of pressure electrothermal oven just can be taken out retort, just can load second retort continuation nitrogenize and produce, thus improve efficiency and saved the energy when pressure electrothermal oven high temperature.
Description
Technical field
The present invention relates to a kind of nitride metal smelting furnace, especially relate to a kind of nitridation sintered stove needing solid metal manganese through vacuum, high temperature, press process.
Technical background
Domesticly at present realize industrialized nitrogenized manganese manufacturing process and mainly contain two kinds: normal pressure nitriding and forvacuum pressure nitriding.Normal pressure solid-state nitration method is exactly at ambient pressure manganese metal raw material is loaded Reaktionsofen (pit furnace, box-type furnace and horizontal pan furnace etc.), in stove, pass into nitrogen purges furnace air clean, and keeping pressure-fired, nitrogen plays the effect purging sealing and nitrogenous source simultaneously, and then intensification nitrogenize cooling is come out of the stove.The advantage of normal pressure solid-state nitration technique is: equipment is simple, invests little, convenient operation, and realizes continuous seepage than being easier to.But the shortcoming of this method is: 1, because be normal pressure nitrogenize, sealing property cannot ensure an oxygen thoroughly except clean, can reduce the effect of nitrogenize and increase scaling loss; 2, high pressure nitrogen cannot be utilized to increase nitrogen content and reduction nitridation time; 3, system fully cannot seal and cause nitrogen consumption increase and energy loss (nitrogen takes away heat).
Forvacuum pressure nitriding is exactly that manganese metal raw material is loaded in vacuum electric heating stove, vacuumizes heating, reaches temperature of reaction and be just filled with nitrogen and keep certain nitrogen pressure nitrogenize (being generally less than 0.4MPa), cools and come out of the stove after reaction terminates.Such as, patent CN101694346A proposes a kind of nitriding furnace realizing forvacuum nitriding.This nitriding furnace makes full use of nitrogen pressure and promotes nitrogenizing reaction, significantly improves nitrogen content, and can shorten the nitrogenizing reaction time.In the forvacuum stage, harmful oxygen is fully discharged, be conducive to nitrogenize and reduce scaling loss.Owing to heating in the system closed, compare normal pressure nitrogenize, nitrogen utilization ratio improves, and the less calories that nitrogen is taken away, energy utilization rate improves relatively.But still there are two large shortcomings in this stove: 1, cooling time is long, and production efficiency is low; 2, equipment is huge, and high pressure realizes difficulty; 3, furnace cooling causes energy consumption to increase.Owing to reacting in encloses container, even if so after nitrogenizing reaction terminates, for preventing manganese metal material high temperature oxidation, fire door high temperature discharging cannot be opened, must furnace cooling.Because the reason of stove inner thermal insulating layer causes cooling time very long, cause production efficiency low.Because all heating systems, thermal insulation layer and charging carriage are all inner at nitriding furnace, cause apparatus casing diameter and length all very large, so the design pressure increasing system will significantly improve the cost of equipment.Therefore equipment is huge, and high pressure realizes difficulty.Same reason, owing to there is heating system, thermal insulation layer and charging carriage in nitriding furnace, the thermal inertia causing system heating and cooling is very large, and must lower the temperature and come out of the stove, and in cause stove to be always in process that cold and hot replaces, energy consumption increases.
Summary of the invention
The object of the invention is for the deficiency in background technology, propose a kind of energy-efficient Pressure nitrogenization furnace, adopt the technology of dual seal, achieve the elevated-temperature seal between retort and pressure electrothermal oven and separating at high temperature.This creates good condition for cooling fast, need not wait for that the cooling of pressure electrothermal oven just can be taken out retort, just can load second retort continuation nitrogenize and produce, improve efficiency and saved energy consumption when pressure electrothermal oven high temperature.
For achieving the above object, the technical scheme that the present invention takes is: a kind of Pressure nitrogenization furnace, it is characterized in that, comprise the retort and pressure electrothermal oven that cooperatively interact, described retort comprises cover, the tank being with tank flange and heat preservation module, and described heat preservation module is fixed on the bottom of cover and makes dead in line; Described pressure electrothermal oven comprises the furnace shell on flanged limit, blind flange and heating module, and described flange is corresponding with blind flange, and described heating module is positioned at furnace shell inside.The retort of round tube type and Reaktionsofen are the preferred plan of this patent, but this patent is not only confined to round shape, also can make square tubular.Retort is vertically mounted to nitriding furnace mode from is above the optimum way of this patent, but this patent is not only confined to this, and level of also can making is installed and up installs from bottom vertical.
Further, described cover or tank are provided with three interfaces: the interface of setting pressure safety valve, install the interface of thermopair and install the valve interface of rapid-acting coupling; Described heat preservation module is also provided with three through holes, with the interface one_to_one corresponding of three on cover or tank.Can rapid cut-off valve door and change quick-connection pipeline after the valve interface of described installation rapid-acting coupling has installed rapid-acting coupling, and play three effects respectively in the different technique periods: connect vacuum lead when vacuumizing, inflated with nitrogen pipeline is connected, opening and closing valve discharging directly into atmosphere during pressure release venting during nitrogenizing reaction.
Further, the middle part of described tank flange is provided with an airtight annular cyclic water channel, and the two ends of the arbitrary diameter of described water annulus have a water-in and a water outlet, and described water-in and water outlet are tightly connected with the circulating pipe of outside respectively.Described sealing water channel and the effect of grommet type seals are used to sealed reaction tank and cover, and the mode of elevated-temperature seal also can be taked to omit sealing water channel.
Further, the upper surface of described tank flange is provided with one ring seal; Described cover and tank flange are fastened and connected by bolt, hydraulic lock or Quick mechanical locking system, described in be tightly connected be by tank flange in the middle part of ring seal and cover lower surface compression fit obtain.
Further, two rows totally six interfaces are provided with outside the circumferential wall of described furnace shell or bottom blind flange or furnace shell: the valve interface of the interface of setting pressure safety valve, the valve interface connecting nitrogen, venting pressure release and connect three interfaces of sealing cable-through hole of three-phase supply respectively.
Further, described blind flange comprises two pieces of flanges of seal welding: upper flange and lower flange, the centre hole of upper flange is more smaller than the centre hole of lower flange, more bigger than retort cylindrical shell external diameter, described upper flange lower surface opens an annular water tank near flange center side, a ring seal is had directly over annular water tank, the arbitrary diameter direction of annular water tank has two grooves and is positioned at the outer peripheral recirculated water water-in of flange and water outlet is connected, and described water-in is connected with outer loop water-lute with water outlet.Described sealed cistern and the effect of grommet type seals are used to sealed reaction tank and pressure furnace, and the mode of elevated-temperature seal also can be taked to omit sealing water channel.Blind flange is integrally economic method by upper and lower flange by being welded into, and the method for casting or overall turning welding also can be adopted to make the blind flange of identical function.
Further, described flange has ring seal by central side upper surface, is evenly equipped with through hole in the outside of flange; Through hole is evenly equipped with, with the through hole one_to_one corresponding on the flange of furnace shell outside the lower flange of described blind flange; Adopt by described through hole one to one the mode be bolted connection to be tightly connected flange limit and blind flange; Described being tightly connected is obtained by the ring seal of flange and blind flange lower surface compression fit.
Further, described heating module is resistance wire in conjunction with aluminum silicate fiber module, wall-hanging resistive band in conjunction with lagging material, globars in conjunction with lagging material or intermediate frequency coil in conjunction with lagging material.
Further, described resistance wire is the aluminum silicate fiber insulation cylinder at a band end in conjunction with aluminum silicate fiber module, external diameter and furnace shell cylinder internal diameter match, internal diameter and retort cylindrical shell external diameter match, concentric fits is in furnace shell, the inner cylindrical wall of described heating module is provided with the spiral slot fallen in, and is provided with resistive heater in described spiral slot.
Further, described retort and pressure electrothermal oven are fastened and connected by bolt, hydraulic locking or Quick mechanical locking system, described in be tightly connected be that ring seal compression fit by tank flange undersurface and upper flange obtains.
The present invention adopts water cooled seal on nitrogenizing reaction tank, in reaction cover bottom, the high temperature in insulation aluminum silicate fiber cylinder module sealing chamber is housed, and makes to cover and the temperature of flange circle lower than 100 DEG C and again heat preservation energy-saving.Such structure make the lid of retort can bear high pressure and indeformable and reveal.And after retort loads pressure electrothermal oven, the flange undersurface of retort and pressure oven process orchid cover surface and define again a water cooled seal, thus the inner chamber body that the barrel of pressure stove outer covering and retort is formed is an airtight container.Synchronization control retort and pressure furnace pressure, the pressure difference so inside and outside retort barrel is zero, solves the contradiction that retort barrel can not bear high temperature and high pressure simultaneously.Such double sealing structure, directly retort can be hung out pressure stove after not only making nitrogenizing reaction terminate, take measure such as water smoke air-cooled grade to cool nitridation product fast, and can, continuously treating that the retort of nitrogenize lifts the electrothermal oven into high temperature, avoid black furnace to waste energy and the production time.In sum, compare traditional nitriding furnace, the present invention not only increases the efficiency of production, also a saving the energy.
Accompanying drawing explanation
Fig. 1 is the solid assembling schematic diagram of Pressure nitrogenization furnace of the present invention.
Fig. 2 is the full sectional view of Pressure nitrogenization furnace of the present invention.
Wherein: 1 retort, 2 pressure electrothermal ovens, 3 threaded tail rods, 4 are connected and installed hole, 5 fitting nuts, 6 pressure furnace blind flange water-ins, 7 pressure furnace blind flange water outlets, 8 blind flanges, 9 flanged (FLGD) furnace shells, the ring seal of 10 furnace shell flanges, 11 furnace shell safety valve mounting interfaces, 12 nitrogen valve door interfaces, 13 venting pressure relief valve interfaces, 14 resistive heaters, 15 heating modules, 16, 17, 18 three-phase supply sealing cable-through hole interfaces, 19 pressure furnace blind flange ring seals, 20 retort flange water-ins, 21 retort ring seal water channels, 22 covers, 23 retort flanges, the ring seal of 24 tank flanges, 25 retort safety valve mounting interfaces, 26 the installation of TC interfaces, 27 rapid-acting coupling mounting interfaces, 28 heat preservation modules, 29 retort flange water outlets, 30 pressure furnace blind flange annular water tanks, 31 pressure furnace blind flange upper flanges, the tank of 32 band tank flanges, cavity in 33 tanks.
Embodiment
Embodiment 1
Pressure nitrogenization furnace described in the present embodiment is made up of retort 1 and pressure electrothermal oven 2.
Retort 1 is made up of three parts: the tank 32 of cover 22, band tank flange and heat preservation module 28.The middle part upper surface of tank flange 23 has one ring seal 24, the annular cyclic water channel 21 that one airtight is had in its underpart, open a water-in 20 and a water outlet 29 respectively at the two ends of the arbitrary diameter of water annulus, intake-outlet is tightly connected with the circulating pipe of outside respectively.Three interfaces are had: the valve interface 27 of the interface 25 of setting pressure safety valve, the interface 26 installing thermopair, installation rapid-acting coupling near cover 22 central zone.Heat preservation module 28 axially have three through holes, with the interface one_to_one corresponding of three on cover.Mode with bolts makes heat preservation module 28 be fixed on the bottom of cover 22 and make dead in line.Cover 22 and tank flange 24 one_to_one corresponding in circumferential edge have multiple bolt hole, it cover 22 is through hole, tank 32 flange is counter sink, the way taking interval to install countersunk screw and nut at the bolt hole of correspondence is fixed, retain the hole not erection bolt of half, and make countersunk screw head not expose the lower surface of flange 24.Retort 1 obtains high pressure seal under the effect of ring seal 23.Cavity 33 in tank is used for reaction cartridge raw material.
Pressure electrothermal oven 2 is made up of three parts: flanged (FLGD) furnace shell 9, blind flange 8, heating module 15.The flange of furnace shell is positioned at furnace shell upper end, has ring seal 10, be evenly equipped with through hole in the outside of flange at flange by central side upper surface.Outside the circumferential wall of furnace shell 9, be provided with two rows totally six interfaces: the interface 11 of setting pressure safety valve, connect the valve interface 12 of nitrogen, the valve interface 13 of venting pressure release, connects the sealing cable-through hole interface 16,17,18 of three-phase supply respectively.Blind flange 8 is welded by two pieces of flange seals: upper flange 31 and lower flange; Upper flange 31 lower surface opens an annular water tank 30 near flange center side, and the arbitrary diameter direction of annular water tank 30 is opened two grooves respectively and is positioned at the outer peripheral recirculated water intake-outlet 6,7 of flange and connects.Recirculated water intake-outlet 6,7 is connected with outer loop water-lute.A ring seal 19 is had directly over annular water tank 30.The centre hole of upper flange 31 is more smaller than the centre hole of lower flange, more bigger than retort 1 cylindrical shell external diameter.The upper surface of upper flange 31 is provided with many threaded tail rods 3, circle distribution, with hole 4 one_to_one corresponding of erection bolt non-in retort 1.Uniform through hole outside lower flange, with the through hole one_to_one corresponding on the flange of furnace shell 9.Heating module 15 is the aluminum silicate fiber insulation cylinders at a band end, and external diameter and furnace shell 9 cylinder internal diameter match, and internal diameter and retort 1 cylindrical shell external diameter match, and concentric fits is in furnace shell 9.Resistive heater 14 is positioned at the spiral slot that the inner cylindrical wall of heating module falls in.
Retort 1 and pressure electrothermal oven 2 are undertaken coordinating by threaded guide rod 3 and hole 4 to be installed.Under the effect of pressure furnace blind flange sealing 19, pressure electrothermal oven is by complete high pressure seal.
Concrete operations are as follows: will treat nitrogenize material tank filling 32, and cover cover 22, and are fastened by bolts the retort that flange obtains sealing.This retort is lifted into pressure electrothermal oven 2, carries out cooperation by threaded guide rod 3 and hole 4 and install, and carry out fastening with nut 5.Rapid-acting coupling is utilized to connect recirculated cooling water to pressure furnace blind flange inlet/outlet 6,7 and retort flange inlet/outlet 29,20 respectively.Insert vacuum-pumping tube to retort interface 27, open vacuum pump evacuation.After vacuum tightness reaches, cut-in pressure electrothermal oven 2 power supply heats.After temperature reaches temperature of reaction, close vacuum pump, more alias 27 pipeline is nitrogen pipeline, opens valve and is filled with nitrogen and controls nitrogen pressure, opens the nitrogen valve 12 of pressure electrothermal oven simultaneously, and adopts identical pressure of source nitrogen.After nitrogenize terminates, close nitrogen valve 12, valve-off 27, then opens valve 13 removal pressure electrothermal oven internal pressure.Unclamp nut 5, hang out retort and enter cooling shaft and cool fast.Lift another retort simultaneously and enter pressure electrothermal oven continuation repetition said process.After the retort of coming out of the stove has cooled, unclamp holding bolt and open cover 22, pour out reaction mass.
Embodiment 2
Pressure nitrogenization furnace described in the present embodiment, is with the difference of embodiment 1, and retort 1 is square tube shape, is installed in pressure electrothermal oven 2 by level.The mode being vertically mounted to nitriding furnace from is above the optimum way of this patent, but this patent is not only confined to this, and level of also can making is installed and up installs from bottom vertical.
Embodiment 3
Pressure nitrogenization furnace described in the present embodiment, is with the difference of embodiment 1, and described cover and tank flange are locked by Quick mechanical device.
Embodiment 4
Pressure nitrogenization furnace described in the present embodiment, is with the difference of embodiment 1, and described heating module is that wall-hanging resistive band is in conjunction with insulating cotton.
Embodiment 5
Pressure nitrogenization furnace described in the present embodiment, is with the difference of embodiment 1, and described retort and pressure electrothermal oven are locked by fast hydraulic pressure device.
Embodiment 6
Pressure nitrogenization furnace described in the present embodiment, is with the difference of embodiment 1, and described retort and pressure electrothermal oven are locked by Quick mechanical locking latches.
Claims (9)
1. a Pressure nitrogenization furnace, is characterized in that, comprises the retort and pressure electrothermal oven that cooperatively interact, and described retort comprises cover, the tank being with tank flange and heat preservation module, and described heat preservation module is fixed on the bottom of cover and makes dead in line; Described pressure electrothermal oven comprises the furnace shell on flanged limit, blind flange and heating module, and described flange is corresponding with blind flange, and described heating module is positioned at furnace shell inside; Described cover or tank are provided with three interfaces: the interface of setting pressure safety valve, install the interface of thermopair and install the valve interface of rapid-acting coupling; Described heat preservation module is also provided with three through holes, with the interface one_to_one corresponding of three on cover or tank.
2. a kind of Pressure nitrogenization furnace according to claim 1, it is characterized in that, the middle part of described tank flange is provided with an airtight annular cyclic water channel, the two ends of the arbitrary diameter of described water annulus have a water-in and a water outlet, and described water-in and water outlet are tightly connected with the circulating pipe of outside respectively.
3. a kind of Pressure nitrogenization furnace according to claim 2, is characterized in that, the upper surface of described tank flange is provided with one ring seal; Described cover and tank flange are fastened and connected by bolt, hydraulic lock or Quick mechanical locking system, described in be fastened and connected and be specially ring seal and cover lower surface compression fit.
4. a kind of Pressure nitrogenization furnace according to claim 1, it is characterized in that, outside the circumferential wall of described furnace shell or bottom blind flange or furnace shell, be provided with six interfaces: the valve interface of the interface of setting pressure safety valve, the valve interface connecting nitrogen, venting pressure release and connect three interfaces of sealing cable-through hole of three-phase supply respectively.
5. a kind of Pressure nitrogenization furnace according to claim 1 or 4, it is characterized in that, described blind flange comprises two pieces of flanges of seal welding: upper flange and lower flange, described upper flange lower surface opens an annular water tank near flange center side, a ring seal is had directly over annular water tank, the arbitrary diameter direction of annular water tank has two grooves and is positioned at the outer peripheral recirculated water water-in of flange and water outlet is connected, and described water-in is connected with outer loop water-lute with water outlet.
6. want a kind of Pressure nitrogenization furnace described in 5 according to right, it is characterized in that, the flange of described furnace shell has ring seal by central side upper surface, is evenly equipped with through hole in the outside of flange; Through hole is evenly equipped with, with the through hole one_to_one corresponding on the flange of furnace shell outside the lower flange of described blind flange; Adopt by described through hole one to one the mode be bolted connection to be tightly connected flange limit and blind flange, described in be tightly connected and be specially ring seal and blind flange lower surface compression fit.
7. a kind of Pressure nitrogenization furnace according to claim 1, is characterized in that, described heating module is resistance wire in conjunction with aluminum silicate fiber module, wall-hanging resistive band in conjunction with lagging material, globars in conjunction with lagging material or intermediate frequency coil in conjunction with lagging material.
8. a kind of Pressure nitrogenization furnace according to claim 7, it is characterized in that, described resistance wire is the aluminum silicate fiber insulation cylinder at a band end in conjunction with aluminum silicate fiber module, external diameter and furnace shell cylinder internal diameter match, internal diameter and retort cylindrical shell external diameter match, concentric fits is in furnace shell, and the inner cylindrical wall of described heating module is provided with the spiral slot fallen in, and is provided with resistive heater in described spiral slot.
9. a kind of Pressure nitrogenization furnace according to claim 1, is characterized in that, described retort and pressure electrothermal oven are fastened and connected by bolt, hydraulic locking or Quick mechanical locking system.
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| CN103643199B true CN103643199B (en) | 2016-02-24 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105039898B (en) * | 2015-09-07 | 2018-01-05 | 重庆傲典工业炉有限公司 | Pit carburizing furnace bottomless Mafu Tank flows water cooling sealing structure |
| CN105396525B (en) * | 2015-10-30 | 2018-09-28 | 核工业北京地质研究院 | A kind of closed pyroreaction kettle |
| CN110329998B (en) * | 2019-07-23 | 2021-02-02 | 英特美光电（苏州）有限公司 | Method for preparing strontium nitride powder in high-pressure nitriding furnace |
| CN110272029B (en) * | 2019-08-02 | 2023-04-11 | 湘西自治州丰达合金科技有限公司 | Preparation method of high-purity manganese nitride |
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| GB564841A (en) * | 1943-02-13 | 1944-10-16 | John Fallon | Improvements in furnaces heated by gaseous or liquid fuels |
| CN101397646A (en) * | 2007-09-30 | 2009-04-01 | 天津市天瑞硬化工程有限公司 | Muffleless can-type gas nitriding furnace |
| CN202688411U (en) * | 2012-07-16 | 2013-01-23 | 浙江长兴奇伟工业炉制造有限公司 | Full-sealed carburizing and nitriding system |
| CN203602360U (en) * | 2013-12-13 | 2014-05-21 | 东北大学 | Pressure nitriding furnace |
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2013
- 2013-12-13 CN CN201310677423.2A patent/CN103643199B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB564841A (en) * | 1943-02-13 | 1944-10-16 | John Fallon | Improvements in furnaces heated by gaseous or liquid fuels |
| CN101397646A (en) * | 2007-09-30 | 2009-04-01 | 天津市天瑞硬化工程有限公司 | Muffleless can-type gas nitriding furnace |
| CN202688411U (en) * | 2012-07-16 | 2013-01-23 | 浙江长兴奇伟工业炉制造有限公司 | Full-sealed carburizing and nitriding system |
| CN203602360U (en) * | 2013-12-13 | 2014-05-21 | 东北大学 | Pressure nitriding furnace |
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