CN2139488Y - Low-oxidation energy-saving heating furnace - Google Patents

Abstract

The utility model provides a low-oxidation energy-saving heating furnace, relating to a heating device used before forging of metal materials. A plurality of ceramic tubes 4 are jointed together by tube hoops 3, which are arranged in a steel structure and a furnace body 7 which is made up of a furnace lining, wherein, the furnace body 7 comprises a fuel channel 9, a burner 8 and a thermo-couples and is provided with air. An air preheater 2 is arranged on the furnace body 7. The air preheater 2 is fixed to a bracket 11 which is provided with a material pusher 1 and a control device 10 by a mobile furnace cover 5 with a material discharge port sealing device 6, wherein, the mobile furnace cover 5 comprises the steel structure and the furnace lining. The utility model uses a method of indirect heating, and compared with an ordinary direct fire heating forge furnace, the burning loss of a workpiece is only 10% of the original forge furnace and the energy can be saved more than 60%.

Description

Low-oxidation energy-saving heating furnace

The utility model relates to the heater of a kind of metal material before forging.

Metal material needs to be heated to 1150～1250 ℃ high temperature before forging.The metal material heating both can also can be carried out in Fuel Furnace at electric furnace.In the heating process, the metal surface can generate oxide skin, and this is especially serious in one method of back.The burning scaling loss has not only been wasted material, the energy, also has a strong impact on die life and forging quality, is that heat processing technique tries hard to avoid.

The heating of employing electric furnace because of power tense and electricity charge costliness, only accounts for seldom ratio (about 5%) in the actual production.And in the conventional fuel stove, metal material is because of directly contacting with high-temperature flue gas, and oxidization burning loss is inevitable.Usually the burning rate (percentage by weight) of each heating is 2～4%.

For fear of this problem, (promptly use the air far below theory burning requirement, make to form reducing atmosphere in the stove and reduce oxidization burning loss) of adopting the imperfect combustion method arranged, in view of a variety of causes, up to now, do not produce in batch with the method is tangible as yet.

The purpose of this utility model provides the forge furnace of a kind of continous way burning liquid, gas or coal, and it can reduce burning and tangible fuel savings effectively.

Above-mentioned purpose is achieved in that pusher pushes workpiece in the earthenware placed side by side in the stove and from the preheating zone and is sent to the thermal treatment zone, outside the workpiece after the heating is pushed successively and comes out of the stove.

Earthenware built on stilts in stove is heated by the high-temp combustion flue gas, the then conduction by earthenware and radiation and heated equably of the workpiece in the pipe.Reduced the oxidization burning loss of metal effectively owing to avoided direct contact of workpiece and high-temperature flue gas.

The utility model provides the indirect heater of a complete hermetic type.The workpiece oxidization burning loss is at the 0.3%(percentage by weight) below, the heat energy utilization rate is more than 45%.Compare with the direct-fired forge furnace of common flame, have following characteristics:

1. because the mode of indirect has reduced the workpiece oxidization burning loss significantly, only be original 10%.

2. because therefore high thermal conductivity, excellent high-temperature intensity that the nitrogen based on silicon carbide earthenware that adopts has have long service life.

3. be provided with the high efficiency air preheater that can save the 15% above energy, furnace lining adopts refractory fibre structure or lightweight refracrory structure, makes heating-up time shortening and more energy-conservation more than 60% than the direct-fired forge furnace of common flame.

4. complete airtight structure, owing to do not have the leakage of combustion product gases, thus operating environment is significantly improved.

5. adopt PC control, realize the automatic control of burning and production process.

The concrete structure of utility model is provided by following embodiment and accompanying drawing thereof.

Below in conjunction with Fig. 1, Fig. 2 and Fig. 3 its CONSTRUCTED SPECIFICATION and working condition are described.

This stove is made up of pusher 1, air preheater 2, pipe collar 3, earthenware 4, movable bell 5, discharging opening sealing device 6, body of heater 7, burner 8, air and fuel conduit 9, thermocouple, control device 10 and support 11.

By material platform support pusher and furnace binding are joined together, by refractory fibre (or light material) furnace lining and movable furnace roof formation stove working space, two sections of the thermal treatment zone and preheating zones are divided in this space in steel construction.The earthenware of 2～8 framed bent skies is installed on furnace bottom, and every row's earthenware is formed several earthenwares connections by pipe collar.Burner is installed in the downside or the both sides of the thermal treatment zone, and air preheater is installed on the charging aperture place furnace roof of preheating section, and the discharging opening sealing device then is located on the discharge port end bell of the thermal treatment zone.Air and fuel channel are positioned at furnace bottom and link with furnace binding.In the stove side control device is housed, furnace roof is equipped with thermocouple.Whole like this stove forms one can whole hang the integral body of moving.As long as stove is in place, connect air, fuel supply pipe and automatically controlled wiring, just can devote oneself to work.

After the high-temperature flue gas that burning generates is crossed the preheating zone from workpiece port of export reverse flow, discharge through air preheater.Workpiece is pushed in the earthenware by pusher,, reaches outside the heating-up temperature pusher comes out of the stove to the thermal treatment zone through the preheating zone.

In order to prolong the life-span of earthenware, pipe is rotatable in stove, so that use rotatable certain angle after a period of time, makes wear and tear the equably inwall of earthenware of workpiece.For not making workpiece be stuck in the joint of two earthenwares, the earthenware endoporus should be made and shrink shape, and its slope is 2～5 ‰.Be the concentricity that guarantees that the some earthenwares of length direction connect, the special pipe collar of adapted is wanted in the joint of two earthenwares.The contact portion of the two will be tried one's best closely, and this situation is seen Fig. 2.Consider the needs that rotate earthenware and maintenance furnace interior spare, adopted the movable bell that can sling, this bell is the same with body of heater, has adopted the fixing light shape structure of refractory fibre or lightweight refracrory and steel construction, sees Fig. 3.Use when arranging earthenware more,, be provided with a discharging opening sealing device for exempting cooling and the oxidation of waiting for the workpiece of releasing at discharging opening.When workpiece will be released outside the stove, this device was opened earlier automatically, afterwards sealing voluntarily immediately.PC in the control device can close by rising of any layout pusher of technology rhythm and corresponding discharging opening sealing device, by setting automatic fuel metering quantity delivered of furnace temperature and air, fuel ratio, guarantees heating quality, realizes energy-conservation.

Claims (3)

1, a kind of few energy-conservation heating furnace of oxidation, it is characterized in that: in furnace binding by refractory fibre, light material furnace lining and movable furnace roof constitute the stove working space, this bottom, space is installed 2～8 rows and several earthenwares is connected the earthenware that forms by pipe collar, burner is contained in the downside or the both sides of the thermal treatment zone, air preheater is contained on the charging aperture place furnace roof, the discharging opening sealing device is located on the discharge port end bell, air and fuel channel are positioned at furnace bottom, control device is equipped with in its stove side, furnace roof is equipped with thermocouple, and they join pusher and furnace binding together by support.

2, heating furnace according to claim 1 is characterized in that: earthenware is rotatable in stove.

3, heating furnace according to claim 1 and 2 is characterized in that: the endoporus of earthenware is for shrinking shape, and its slope is 2～5 ‰.

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