CN1257990A

CN1257990A - Method for decreasing heat loss of industrial furnace shell

Info

Publication number: CN1257990A
Application number: CN 99124184
Authority: CN
Inventors: 潘健生; 胡明娟; 余宁; 毛立忠
Original assignee: Shanghai Jiaotong University
Current assignee: Shanghai Jiaotong University
Priority date: 1999-12-01
Filing date: 1999-12-01
Publication date: 2000-06-28
Anticipated expiration: 2019-12-01
Also published as: CN1139779C

Abstract

A mehod for decreasing the heat loss of industrial furnace shell features use of dual-layer furnace shell, that is, an additional shell made of thin steel or aluminium sheet is used outside exisiting shell to form an enclosed air layer, so increasing thermal resistance. A layer of refractory fibres is attached to internal or external surface of dual-layer furnace shell.

Description

Reduce the method for heat loss of industrial furnace shell

Patent of the present invention relates to a kind of method that reduces the industrial furnace heat loss, and especially a kind of method that reduces heat loss of industrial furnace shell belongs to the metallurgical industrial furnace design field.

Industrial furnace is widely used in metallurgy, casting, industries such as heat treatment and forging.Its energy consumption accounts for more than 80% of hot-working special manufacturer.Improve the thermal efficiency of industrial furnace, reduce energy resource consumption, the life-span that prolongs stove is one of emphasis of industrial furnace research.For saving the energy, the protection environment effectively utilizes existing resource, is necessary industrial furnace is carried out reducing energy consumption.The general industry stove only wraps one deck steel plate outside furnace lining, this layer steel plate also has sealing to reduce the effect of stove heat loss except playing the effect of protection furnace lining.But the furnace surface temperature of one deck furnace shell is still higher, and heat loss is bigger, causes work under bad environment simultaneously.If only reduce the method for radiation loss by the thickening furnace lining, can increase the accumulation of heat loss of furnace lining again, can not reduce fire box temperature for the stove of the cooling that requires to heat up repeatedly rapidly because of furnace lining is too thick, reduce operating efficiency.Increase one deck shell outside industrial furnace an air-gap is set, this structure does not increase lining thickness but can reduce radiation loss, can solve the contradiction of rapid cooling again simultaneously, enhances productivity.Analyze by prior art documents, do not find the relevant report of this theme as yet.

The objective of the invention is to overcome the deficiencies in the prior art, the problem at the heat loss of industrial furnace surface radiating proposes a kind of method that reduces heat loss of industrial furnace shell, has obtained energy-saving effect preferably.

Technical scheme of the present invention is as follows: the furnace lining of existing industrial furnace has only one deck steel plate outward, the present invention adopts the method for double-deck furnace shell structure that one deck sheet metal or aluminium sheet are installed outside industrial furnace, form double-deck furnace shell, the surface temperature of industrial furnace further reduces, reduce heat loss, in double-deck furnace shell inboard or the outside paste one deck refractory fibre, better effects if, can also the bottom of double-deck furnace shell and above movable cover plate is installed, when heating and insulation, close loam cake and lower cover, the double-deck furnace hull shape becomes the occluded air layer, reduce heat loss, and when needs cool off, open upper and lower covers, quicken cross-ventilation and accelerate cooling, this method is applicable to the industrial furnace of the cooling that need heat up repeatedly, as gas carbruizing furance, temperature is higher during carburizing, requires high insulating effect, carburizing finishes the interior temperature of back stove will drop to hardening heat, requires to accelerate heat radiation in this stage.The present invention can better solve heat tracing stage and the different requirements of temperature-fall period to the furnace wall heat radiation, greatly enhance productivity, can also be on body of heater with plate sheet welding, make double-deck furnace shell become the watertight cavity of sealing, two ends are installed into water pipe and outlet pipe up and down, the external cooling water in upper end, the lower end draining, water valve is installed at two ends respectively up and down, heating process drains the water in the cavity, close the two ends valve, the occluded air layer in the cavity plays the effect of heat-insulation and heat-preservation, when needing cooling, open water valve up and down, inject cooling water, the water leg of cavity below band gradient compiles water, gets rid of by the drainpipe of bottom, water can be used by water pump blowback recirculation after cooling: if cooling velocity needn't too fast or no-cooling-water, can two ends be installed by breather valve respectively up and down at stove, external air blast is blown into the cold air cooling without cooling water with the air blast brute force during cooling.

The present invention has very high use value, improve energy-saving effect significantly, reduce radiation loss more than 10%, especially for need heat up repeatedly the cooling industrial furnace, when heating up, can reduce heat loss, can lower the temperature rapidly again during cooling, obviously improve the work efficiency of heating furnace, adopt the present invention also can obtain similar effect other kinds discontinuous running stove.

Further describe below in conjunction with accompanying drawing:

The generalized section of Fig. 1 splint fixation formula type of furnace.

The generalized section of the board-like type of furnace of Fig. 2 removable cover.

The generalized section of Fig. 3 water cooling type of furnace.

The generalized section of Fig. 4 air cooling type of furnace.

As shown in Figure 1, Figure 2, Figure 3 and Figure 4, the present invention adopts the method for double-deck furnace shell structure, outside furnace shell 1, install one deck sheet metal or aluminium sheet 2 additional, the occluded air layer that forms has increased thermal resistance, constitutes double-deck furnace shell, two-layer between bolt 3 or other modes of available cover porcelain tube link to each other, the surface temperature of stove further reduces, reduce heat loss, also can be in double-deck furnace shell inboard or the outside paste one deck refractory fibre 4, better effects if.The bottom 5 of double-deck furnace shell and above 6 movable cover plate 7,8 is installed, when heating and insulation, close loam cake 7 and lower cover 8, the double-deck furnace hull shape becomes the occluded air layer, reduce heat loss, and when cooling, open upper and lower cover 7,8, and quicken cross-ventilation and accelerate cooling, be applicable to the industrial furnace of the cooling that need heat up repeatedly.As gas carbruizing furance, temperature higher (about 930 ℃) requires high insulating effect during carburizing, and carburizing finishes the interior temperature of back stove will drop to hardening heat (about 860 ℃), requires to accelerate heat radiation in this stage.The present invention can better solve heat tracing stage and the different requirements of temperature-fall period to the furnace wall heat radiation, greatly enhances productivity.Thin plate 2 is welded on the body of heater, double-deck furnace shell becomes the watertight cavity of sealing, on, following two ends are installed into water pipe 9 and outlet pipe 10, the external cooling water in upper end, the lower end draining, water valve 11 is installed at two ends up and down, during heating, drains the water in the cavity, close two ends valve 11, occluded air layer in the chamber plays the effect of heat-insulation and heat-preservation, when needing cooling, opens water valve 11 up and down, inject cooling water, the water leg of cavity below band gradient compiles water, discharges by the drainpipe of bottom, and water also can recycle use after cooling off, if cooling velocity needn't be too fast, can be on stove, breather valve 12 is installed at following two ends, and external air blast (not marking among the figure) is blown into the cold air cooling with the air blast brute force during cooling.

Claims

1, a kind of method that reduces heat loss of industrial furnace shell is characterized in that adopting the method for double-deck furnace shell structure, installs one deck sheet metal or aluminium sheet 2 outside furnace shell 1 additional, and the occluded air layer of formation has increased thermal resistance.

2, the method for this minimizing heat loss of industrial furnace shell according to claim 1, its feature also are in double-deck furnace shell inboard or one deck refractory fibre 4 is pasted in the outside.

3, the method for this minimizing heat loss of industrial furnace shell according to claim 1, its feature also be the bottom 5 of double-deck furnace shell and above 6 movable cover plate 7,8 is installed, when heating and insulation, close loam cake 7 and lower cover 8, the double-deck furnace hull shape becomes the occluded air layer, reduces heat loss, and opens upper and lower cover 7,8 when cooling, quicken cross-ventilation and accelerate cooling, be applicable to the industrial furnace of the cooling that need heat up repeatedly.

4, the method for this minimizing heat loss of industrial furnace shell according to claim 1, its feature also are thin plate 2 is welded on the body of heater, and double-deck furnace shell becomes the watertight cavity of sealing, upper/lower terminal is installed into water pipe 9 and outlet pipe 10, the external cooling water in upper end, the lower end draining, water valve 11 is installed at two ends up and down, during heating, drain the water in the cavity, close two ends valve 11, when needing cooling, open water valve 11 up and down, discharge by the drainpipe of bottom.

5, the method for this minimizing heat loss of industrial furnace shell according to claim 1, its feature also is if cooling velocity needn't be too fast, can breather valve 12 be installed at the stove upper/lower terminal, external air blast (not marking among the figure) is blown into the cold air cooling with the air blast brute force during cooling.