WO2012174735A1

WO2012174735A1 - Energy-saving cone and furnace

Info

Publication number: WO2012174735A1
Application number: PCT/CN2011/076271
Authority: WO
Inventors: 张海鑫; 刘鹏; 赵亚楠
Original assignee: 北京中太投资管理有限公司
Priority date: 2011-06-24
Filing date: 2011-06-24
Publication date: 2012-12-27

Abstract

Disclosed is an energy-saving cone which can increase the radiation rate of furnace and a furnace furnished with the energy-saving cone. The energy-saving cone includes matrix (1) which has parallel upper (2) and lower surfaces and side surface (3) located between the upper and lower surfaces. The upper surface opens down a radiation chamber (4). The cross-sections of side surfaces are circulars. The upper surface, the side surface and the inner wall of the radiation chamber are coated with high temperature and strong radiation coating. The energy-saving cone has simple structure, high radiation rate, good energy-saving effect and long service life.

Description

Energy saving cone and energy saving furnace

The invention relates to an energy saving device installed on a kiln and a heating furnace.

Background technique

In order to improve the thermal efficiency of industrial heating furnaces, scientific and technological workers in various countries have made fruitful explorations. According to the British "Glass" NO.10.1992, Didier Fomital honeycomb refractory bricks are used in the top of glass pool kiln, and the furnace area is enhanced to increase the transmission. Heat, in theory, can achieve energy savings of 5~8%. However, this brick can not regulate the heat ray, the heat ray can not be directly directed to the heated workpiece, and the energy saving rate is not high; "Practical Energy Saving Technology" (Shanghai Science and Technology Press, April 1993), Japan Kawasaki Steel Company Water The island plant "changs the heat transfer mode device" on the rolling steel heating furnace to convert part of the convective heat transfer into radiation heat transfer to improve the heat transfer efficiency and save the heating furnace about 5%, but this method increases the heat transfer area. Not large, can not regulate heat rays, and can not improve the emissivity; "Infrared and Millimeter Journal" 1993.12 published "high emissivity energy-saving coatings and their applications" article, through the infrared spray furnace to save energy, because this method can not regulate heat The ray does not increase the heat transfer area, the energy saving effect is about 5~10%, and the service life is between 5~12 months. Patent No. ZL94236755.3 "Strong radiation heat transfer energy-saving industrial furnace", although solving the problem of increasing heat transfer area, increasing emissivity, and regulating heat rays, the energy saving rate reaches 15~20%, but its implementation is complicated and the construction difficulty Large, construction time is too long, the application of hard refractory materials can not be used because of the inability to punch holes, etc., the application is greatly limited.

Summary of the invention

The technical problem to be solved by the present invention is to provide an energy-saving cone and an energy-saving furnace kiln with simple structure, high emissivity, good energy-saving effect and long service life.

The energy-saving cone of the present invention comprises a base body having parallel upper and lower surfaces, and a side surface between the upper surface and the lower surface, wherein the upper surface is provided with a radiation chamber downwardly, and the horizontal surface of the side surface The cross section is circular or elliptical, and the upper surface, the side surface and the inner wall of the radiation chamber are coated with a high temperature high emissivity coating.

The energy-saving cone of the present invention, wherein the radiation cavity is circular, elliptical, rectangular, rhombic or polygonal in cross section. The energy-saving cone of the present invention, wherein the area of the cross section of the radiation cavity gradually increases or decreases from above and below.

The energy-saving cone of the present invention, wherein the side surface is uniformly provided with a plurality of protrusions connecting the upper surface and the lower surface, the protrusion has a fan-shaped cross section, and the outer surface of the protrusion is coated with a high temperature and high emissivity coating.

The energy-saving cone of the present invention, wherein the material of the substrate is a refractory material, a ceramic material, a ceramic fiber or a stainless steel material. The energy-saving cone of the present invention, wherein the high-temperature high-emissivity paint is produced by the following method: 50 500 parts of silicon carbide

Alumina 100 500 parts

Iron oxide 10 150 parts

Zirconia 1~50 parts

Manganese oxide 0~50 parts

Oxide 镧 0~15 parts

Oxide 铈 0~50 parts

Bentonite 0~90 parts

Refractory clay 0 200 parts

Titanium dioxide 0 200 parts

Silica sol 120 500 parts

Water glass 0~50 parts

Carboxymethyl cellulose 0~50 parts

Among them, silica sol, water glass and carboxymethyl cellulose are used as solvents;

B, mixing other raw materials and sintering at 1200 ~ 1400 ° C for 2 ~ 4 hours, the sintered material is subjected to nano-scale ultra-fine grinding, the particle size of the material is treated to 2 ~ 100nm;

C. The refining and processing materials are mixed with the solvent in proportion, and uniformly dispersed by a three-roller machine to form a viscous suspension liquid to obtain a high-temperature and high emissivity coating material.

The energy-saving cone of the present invention, wherein the high-temperature high-emissivity paint has a thickness of 0.02 to 2 mm.

The energy-saving furnace of the present invention, wherein the top wall and the side wall of the heating furnace are fixedly connected with a plurality of energy-saving cones, the inner wall of the furnace is coated with a high-temperature high-emissivity paint, and the opening of the radiation chamber of the energy-saving cone faces the furnace Heat the area of the workpiece.

In the energy-saving furnace of the present invention, the lower surface of the energy-saving cone is fixedly connected to the inner wall of the furnace by bonding. In the energy-saving furnace of the present invention, the energy-saving cones are sequentially connected in series on the ceramic rod, and the two ends of the ceramic rod are fixedly connected to the inner wall of the furnace.

In the energy-saving furnace of the present invention, the plurality of energy-saving cones are fixedly connected to the bottom wall of the furnace and the furnace door.

The energy-saving cone of the invention has a unique geometric shape, can increase the internal extension of the furnace, and increase the heat transfer area by more than one time; at the same time, the energy-saving cone absorbs the diffused and scattered heat rays by the high-temperature high-radiation coating coated on the surface thereof, and emits The rate is between 0.93 and 0.96, which makes it from disorder to order. The formed heat ray beam is directly and directly directed to the heated workpiece, which improves the thermal efficiency by 10~20% and improves the production efficiency by 15~25%. It can also save 20~35% of energy and have a service life of 5 years. DRAWINGS

Figure 1 is a front cross-sectional view of the energy-saving furnace of the present invention;

2 is a schematic perspective view showing the structure of an energy-saving furnace of the present invention;

Figure 3a is a front cross-sectional view showing a first embodiment of an energy-saving cone in an energy-saving furnace of the present invention;

3b is a top view of a first embodiment of an energy-saving cone in an energy-saving furnace of the present invention;

4a is a front cross-sectional view showing a second embodiment of an energy-saving cone in an energy-saving furnace of the present invention;

4b is a top view of a second embodiment of an energy-saving cone in an energy-saving furnace of the present invention;

Figure 5a is a front cross-sectional view showing a third embodiment of the energy-saving cone in the energy-saving furnace of the present invention;

Figure 5b is a plan view showing a third embodiment of the energy-saving cone in the energy-saving furnace of the present invention;

6a is a front cross-sectional view showing a fourth embodiment of an energy-saving cone in an energy-saving furnace of the present invention;

6b is a top view of a fourth embodiment of an energy-saving cone in an energy-saving furnace of the present invention;

Figure 7a is a front cross-sectional view showing a fifth embodiment of an energy-saving cone in an energy-saving furnace of the present invention;

Figure 7b is a top plan view of a fifth embodiment of the energy saving cone in the energy-saving furnace of the present invention.

detailed description

As shown in FIG. 1 and FIG. 2, the top wall 6 and the side wall 7 of the heating furnace of the energy-saving furnace of the present invention are fixedly connected with a plurality of energy-saving cones 8 by means of bonding, as shown in FIG. 3a and FIG. 3b, the energy-saving cone The base body 1 comprises a substantially truncated base body 1 having a parallel upper surface 2 and a lower surface, and a side surface 3 between the upper surface 2 and the lower surface. The upper surface 2 is downwardly provided with a radiation chamber 4, a radiation chamber 4 is a small upper and a large round table shape, the upper surface 2, the side surface 3 and the inner wall of the radiation chamber 4, and the inner wall of the furnace is coated with a high-temperature high-emissivity paint, and the opening of the radiation chamber 4 faces the area where the workpiece is heated in the furnace chamber. .

For the installation method of the energy-saving cone 8, other methods may be employed, for example, the energy-saving cone 8 is connected in series on a ceramic rod, and the two ends of the ceramic rod are fixedly connected to the inner wall of the furnace.

As shown in Fig. 4a and Fig. 4b, in the second embodiment of the energy-saving cone of the energy-saving kiln of the present invention, the base body 1 is also in the shape of a truncated cone, and the radiation chamber 4 has a truncated cone shape which is large and small.

As shown in Fig. 5a and Fig. 5b, the base body 1 of the third embodiment of the energy-saving cone of the present invention is also in the shape of a truncated cone, and the radiation chamber 4 is cylindrical.

As shown in Fig. 6a and Fig. 6b, the base body 1 of the fourth embodiment of the energy saving cone of the present invention is an elliptical cylinder, and the radiation chamber 4 is also an elliptical cylinder.

As shown in Fig. 7a and Fig. 7b, the base body 1 of the fifth embodiment of the energy saving cone of the present invention has a cylindrical shape, and the radiation chamber 4 is also cylindrical. The side surface 3 is evenly disposed with a plurality of protrusions 5 connecting the upper surface 2 and the lower surface. The protrusion 5 has a fan-shaped cross section, and the protrusion 5 is integrally formed with the base body 1. The outer surface of the protrusion 5 is coated with a high temperature. High emissivity coatings.

The matrix material in the above several embodiments is a refractory material, a ceramic material, a ceramic fiber or a stainless steel material, according to The temperature of the furnace is applied to select different materials. The high temperature and high emissivity coating of the above embodiment can be obtained in the following manners.

The first preparation method:

A. Weigh the preparation according to the weight ratio of each component.

Silicon carbide 300 parts

Brown corundum (Α1 ₂ Ο ₃ ) 200 parts

Iron oxide 110 parts

Zirconia 10 parts

Oxide 50 parts

Bentonite 90 parts

Refractory clay 120 parts

Silica sol 200 parts

Carboxymethyl cellulose 10 parts

Wherein silica sol and carboxymethyl cellulose are used as solvents;

B, after mixing other raw materials, sintering at 1200 ° C for 4 hours, the sintered product is subjected to nano-scale ultra-fine grinding, the particle size of the material is treated to 2 ~ 100nm;

C. The refining and processing materials are mixed with the solvent in proportion, and uniformly dispersed by a three-roller machine to form a viscous suspended liquid to obtain a micro-nano ultrafine powder high-temperature high-emissivity paint. The second preparation method:

A. Weigh the preparation according to the weight ratio of each component.

Silicon carbide 200 parts

Brown corundum (Α1 ₂ Ο ₃ ) 500 parts

Iron oxide 100 parts

Zirconia 20 parts

Manganese oxide 50 parts

Antimony oxide 15 parts

Refractory clay 200 parts

Titanium dioxide 200 parts

Silica sol 450 parts

50 parts of carboxymethyl cellulose Wherein silica sol and carboxymethyl cellulose are used as solvents;

B, after mixing other raw materials, sintering at 1400 ° C for 2 hours, the sintered product is subjected to nano-scale ultra-fine grinding, the particle size of the material is treated to 2 ~ 100nm;

C. The refining and processing materials are mixed with the solvent in proportion, and uniformly dispersed by a three-roller machine to form a viscous suspended liquid to obtain a micro-nano ultrafine powder high-temperature high-emissivity paint. The third preparation method:

A. Weigh the preparation according to the weight ratio of each component.

Silicon carbide 160 parts

Brown corundum (Α1 ₂ Ο ₃ ) 100 parts

Iron oxide 100 parts

Zirconia 50 parts

Antimony oxide 40 parts

Bentonite 10 parts

Titanium dioxide 20 parts

Silica sol 120 parts

Water glass 50 parts

Wherein silica sol and water glass are used as solvents;

B, after mixing other raw materials, sintering at 1300 ° C for 2 hours, the sintered product is subjected to nano-scale ultra-fine grinding, the particle size of the material is treated to 2 ~ 100nm;

C. The refining and processing materials are mixed with the solvent in proportion, and uniformly dispersed by a three-roller machine to form a viscous suspended liquid to obtain a micro-nano ultrafine powder high-temperature high-emissivity paint.

In general, when the furnace temperature is above 900 °C, the heat transfer is mainly radiation, and the heat radiation is 15 times of convection, accounting for more than 90%. Most of the high-temperature radiant energy is concentrated in the 1~5 μιη band. For example, at 1000 °C and 1300 °C, 76% and 85% of the radiant energy are concentrated in this band, respectively. The general refractory material is in this band. Very low emissivity (0.2 0.6) High emissivity coatings have high emissivity (above 0.9) in the 1~15 μm spectrum range.

The emissivity of the refractory at room temperature will decrease greatly with the increase of the furnace temperature, while the high emissivity coating can maintain a high emissivity of 0.9 or higher. As is known, the absorption rate of the material is equal to the emissivity. When the emissivity of the energy-saving cone is increased, its ability to absorb heat is also increased accordingly. The emissivity of the furnace furnace material is generally 0.6 0.8, and the high temperature is only 0.4 0.5. The radiation heat transfer effect is poor, and a large amount of heat is not absorbed by the workpiece and carried away with the flue gas. The high-temperature and high-emissivity coating layer can increase the emissivity of the energy-saving cone and furnace at a high temperature from 0.4 0.5 to above 0.9. In the fuel furnace, the calculation formula of the heat transfer heat flux of the high temperature furnace gas and the furnace wall is as follows:

Q = 丄+丄— ~ J ^w ( )

Where: TG, TW are the temperature of the furnace gas and the furnace wall

eG sGW is the blackness of the furnace gas in the TG and the furnace wall at TW

ε\¥ is the blackness of the furnace wall

FW is the area of the furnace wall

When TG and TW are not much different, it can be approximated as: sG=sGW, then the above formula can be simplified as:

This shows that increasing ε\¥ and FW will enhance the radiant heat transfer Q between the furnace gas and the furnace wall, increasing the temperature of the inner surface of the lining, thereby enhancing the radiation transmission between the lining and the heated workpiece. heat. Increasing the furnace area and increasing the blackness of the furnace wall are effective ways to enhance the radiation heat transfer in the furnace. Appropriate parts in the furnace of the process furnace, such as the top wall and side wall of the furnace, and the parts that are not easily heated, such as the furnace door and the bottom of the furnace, are installed with energy-saving cones, and the inside of the furnace is infrared-enhanced to form a furnace. Infrared heating system, a large number of energy-saving cones continuously absorb the diffused and scattered heat rays, and at the same time continuously emit heat rays at the same ratio. Due to the geometry of the energy-saving cone, these emitted heat rays are completed. The process of regulation from disorder to order and directly to the workpiece.

The energy-saving cone of the energy-saving furnace of the invention is tested by the China Building Materials Research Institute, and its emissivity is above 0.93, which is basically not aging, and the service life can reach more than 5 years. As mentioned above, a large number of energy-saving cones are directly directed to the heated workpiece after the heat ray control is completed, which improves the heat ray arrival rate and irradiance, and enhances the mode heat transfer. The applicable energy types of the invention are electricity, natural gas, gas, fuel oil and the like. Practice has proved that after the heating furnace kiln is modified by energy-saving cone-enhanced infrared heat transfer technology, energy saving is 15~30%; the working efficiency is increased by 10~15%; the furnace temperature uniformity is improved, the exhaust gas temperature is reduced by 50~100°C, and the air pollution is reduced. , has an environmental effect. Industrial applicability

The energy-saving cone of the invention can be fabricated by using existing materials, and the raw materials for the high-temperature and high-radiation coating on the surface thereof are also It is easy to obtain, and it is installed on the inner wall of the heating kiln, which greatly improves the heating efficiency of the heating kiln, saves fuel and reduces environmental pollution, so it has great market prospect and strong industrial application. Sex.

Claims

Rights request

An energy-saving cone, comprising: a base body (1) having a parallel upper surface (2) and a lower surface, and a side surface between the upper surface (2) and the lower surface ( 3), the upper surface (2) is downwardly provided with a radiation cavity (4), the side surface (3) has a circular or elliptical cross section, and the upper surface (2) and the side surface (3) ) and the inner wall of the radiation chamber (4) is coated with a high temperature and high emissivity coating.

2. The energy-saving cone according to claim 1, wherein the cavity of the radiation cavity (4) has a circular, elliptical, rectangular, diamond or polygonal cross section.

3. The energy-saving cone according to claim 2, wherein: the area of the cross section of the cavity of the radiation chamber (4) gradually increases or decreases from above and below.

The energy-saving cone according to claim 3, characterized in that: the side surface (3) is uniformly provided with a plurality of protrusions (5) connecting the upper surface (2) and the lower surface, the protrusions (5) The cross section is a fan shape, and the outer surface of the protrusion (5) is coated with a high temperature and high emissivity coating.

The energy-saving cone according to claim 1, characterized in that the material of the base body (1) is a refractory material, a ceramic material, a ceramic fiber or a stainless steel material.

6. The energy saving cone according to any one of claims 1 to 5, wherein: said high temperature high emissivity paint is produced by the following method:

A. Weigh the preparation according to the weight ratio of each component.

Silicon carbide 50 500 parts

Alumina 100 500 parts

Iron oxide 10 150 parts

Zirconia 1~50 parts

Manganese oxide 0~50 parts

Oxide 镧 0~15 parts

Oxide 铈 0~50 parts

Bentonite 0~90 parts

Refractory clay 0 200 parts

Titanium dioxide 0 200 parts

Silica sol 120 500 parts

Water glass 0~50 parts

0~50 parts of carboxymethyl cellulose Among them, silica sol, water glass and carboxymethyl cellulose are used as solvents;

The energy-saving cone according to claim 6, wherein the high-temperature high-emissivity paint has a thickness of 0.02 to 2 mm.

8. An energy-saving furnace kiln equipped with the energy-saving cone according to claim 7, characterized in that: a plurality of energy-saving cones (8) are fixedly connected to the top wall (6) and the side wall (7) of the heating furnace. The inner wall of the furnace is coated with a high-temperature, high-emissivity paint, and the opening of the radiation chamber (4) of the energy-saving cone (8) faces the area in the furnace where the workpiece is heated.

The energy-saving furnace according to claim 8, characterized in that: the lower surface of the energy-saving cone (8) is fixedly attached to the inner wall of the furnace by means of bonding.

The energy-saving kiln according to claim 8, characterized in that: the energy-saving cone (8) is sequentially connected in series on the ceramic rod, and both ends of the ceramic rod are fixedly connected to the inner wall of the furnace.

The energy-saving furnace according to claim 9 or 10, characterized in that: the bottom wall of the furnace and the furnace door are fixedly connected to the plurality of energy-saving cones (8).