WO2017177894A1

WO2017177894A1 - Heat transfer enhancement mesh-honeycombed bulge and kiln

Info

Publication number: WO2017177894A1
Application number: PCT/CN2017/080075
Authority: WO
Inventors: 邓长友
Original assignee: 深圳市鸿效节能股份有限公司
Priority date: 2016-04-11
Filing date: 2017-04-11
Publication date: 2017-10-19
Also published as: CN105758242A; CN105758242B

Abstract

A heat transfer enhancement mesh-honeycombed bulge (1-1, 1-2, 1-3, 1-4) and a kiln. The heat transfer enhancement mesh-honeycombed bulge (1-1, 1-2, 1-3, 1-4) is provided with mutually-communicated holes from the outer surface to the inside. The top cross section area of the appearance of the mesh-honeycombed bulge (1-1, 1-2, 1-3, 1-4) is smaller than or equal to the bottom cross section area, and the angle between the geometric center line and the bottom cross section is 15° to 90°. The heat transfer enhancement mesh-honeycombed bulge (1-1, 1-2, 1-3, 1-4) fast absorbs heat in smoke and converts the heat into radiation heat to be directionally transferred to a to-be-heated object, so that the bottleneck in the heat transfer process is eliminated, and obvious effects can be generated for device miniaturization or energy saving and emission reduction.

Description

Cellular honeycomb package and kiln for enhancing heat transfer

Technical field

The invention belongs to the technical field of thermal engineering, and in particular relates to a mesh honeycomb package for enhancing heat transfer and a kiln using the same.

Background technique

In the human life and production field, a large amount of fuel is used to generate heat. To utilize this heat energy, it is necessary to effectively transfer the heat to the heated object. The equipment for this purpose includes a metal smelting furnace, a metal heating furnace, a heat treatment furnace, Ceramic kiln, cement kiln, glass furnace, chemical cracking furnace, etc. In our country, the energy consumed in this way accounts for a large part of the total energy consumption in the country. Not only is energy consumption high but also accompanied by a large amount of carbon emissions and serious environmental pollution. In order to reduce the energy consumption in these kiln production processes, relevant research institutions and production companies are constantly exploring new technologies to reduce energy consumption while reducing environmental pollution.

At present, people have achieved quite good results in the full combustion of fuel and the recovery of waste heat. However, the heat generated by the combustion of the fuel is mainly in the flue gas generated by the combustion, and only by convective heat transfer can the heat energy be transferred to the heated object. The theory and practice of heat transfer prove that the convective heat transfer rate of gas is relatively low. For this reason, many methods and techniques for increasing the convective heat transfer rate, such as forced convection heat transfer and fin increase, have been adopted. Convective heat transfer area, etc. However, the use of these techniques does not change the heat transfer rate of hot flue gas to the heated object in many cases, and the convective heat transfer rate is a bottleneck in the entire heat transfer process.

If there is a technology, the above convective heat transfer speed can be enhanced, and the bottleneck in the heat transfer process can be eliminated as much as possible, which will certainly improve the utilization efficiency of human heat energy. Therefore, it is necessary to carry out development research to provide a new high-efficiency convection heat transfer technology to improve the efficiency of heat energy utilization to achieve energy saving and environmental pollution reduction.

Summary of the invention

In order to solve the above problems, an object of the present invention is to provide an enhanced heat transfer mesh honeycomb package and a kiln using the same, to improve heat energy utilization, thereby achieving energy saving and environmental pollution reduction.

To achieve the above object, the technical solution of the present invention is:

An enhanced heat transfer mesh honeycomb package, which is provided with a hole that communicates with each other from an outer surface to an inner dense. The mesh cross-sectional area of the mesh honeycomb package has a bottom cross-sectional area, an angle of a geometric center line and a bottom cross section of 15°-90°. .

Further, the mesh honeycomb package is provided with one or more cavities that open in the same direction.

Further, the cross-sectional shape of the mesh honeycomb package is circular, square or variable cross section.

Further, the mesh honeycomb package is a convex or flat type, and all surfaces of the mesh honeycomb package are coated with a far infrared radiation material.

Another technical solution of the present invention is: a kiln comprising a bottom, a furnace wall, a furnace top, And a furnace formed by the furnace door, the bottom of the furnace is placed with an object to be heated; wherein the above-mentioned heat-resistant mesh honeycomb package is arranged on the roof lining or/and the furnace wall lining.

Another technical solution of the present invention is: a kiln comprising a furnace consisting of a furnace bottom, a furnace wall, a furnace top, and a furnace door, wherein the bottom of the furnace is placed with an object to be heated; wherein, on the object to be heated A mesh honeycomb package provided with the heat transfer enhancement of claim 1.

Compared with the prior art, the mesh heat-enhancing mesh honeycomb package of the present invention quickly absorbs heat in the hot flue gas and converts it into radiant heat to be transmitted to the heated object, thereby eliminating bottlenecks in the heat transfer process and miniaturizing the device. Or energy saving and emission reduction can produce obvious results.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings which are used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Other drawings may also be obtained from those skilled in the art from the drawings.

1A-1D are schematic views of a mesh honeycomb package for enhanced heat transfer according to the present invention.

2 is a schematic view showing the principle of enhanced convective heat transfer of the mesh heat-enhancing mesh honeycomb package of the present invention.

Figure 3 is an illustration of a mesh honeycomb fired industrial furnace using enhanced heat transfer.

Figure 4 is a schematic illustration of the enhanced heat transfer mesh honeycomb package of the present invention mounted on a roof lining brick.

Figure 5 is a schematic view of the mesh heat-insulating mesh honeycomb package of the present invention installed on a furnace wall lining brick.

detailed description

The embodiment of the invention provides a mesh honeycomb package for enhancing heat transfer, which greatly improves the efficiency and speed of convection and radiation heat transfer, and has a significant impact on energy saving and consumption reduction of the entire metal smelting furnace.

In order to make the object, the features and the advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. The described embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of the present invention.

The terms "first", "second" and the like in the specification and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a particular order or order. It is to be understood that the terms so used are interchangeable as appropriate, and are merely illustrative of the manner in which the objects of the same. In addition, the terms "comprises" and "comprises" and "comprises", and any variations thereof, are intended to cover a non-exclusive inclusion so that a process, method, system, product, or device comprising a series of units is not necessarily limited to those elements, but may include Other units listed or inherent to these processes, methods, products or equipment.

The details are described below separately.

The invention relates to a heat-enhanced mesh honeycomb bag, which is provided with a hole which communicates with each other from an outer surface to an inner dense. The mesh cross-sectional area of the mesh honeycomb package has a bottom cross-sectional area, an angle of a geometric center line and a bottom cross-section of 15°. ‐90°, one or more of the mesh cells are opened a cavity that opens in one direction.

In another embodiment, the mesh honeycomb package has a circular, square or variable cross section, and the bottom of the mesh honeycomb package cooperates with the refractory wall to be installed for easy installation.

In another embodiment, the mesh honeycomb package is formed of a metal or refractory material in the shape of a boss, and the surfaces of the mesh honeycomb package are coated with far infrared radiation materials from the outer surface to the inner densely communicating holes.

Specifically, as shown in FIG. 1A to FIG. 1D, the heat-enhanced mesh honeycomb packages 1‐1, 1‐2, 1‐3, and 1‐4 of the present invention are four specific implementation forms of the mesh honeycomb package, of course. It is not limited to these four shapes, and other irregular shapes are also possible. Wherein, the geometric centerline of the mesh honeycomb package 1‐1, 1‐2 has an angle of 90° with the bottom section, and the mesh honeycomb package 1‐2 has a plurality of cavities. The angle of the 1⁄3 geometric centerline of the mesh honeycomb package to the bottom section is less than 90°. The mesh honeycomb package 1‐4 has a circular shape and no central cavity. In the specific implementation, the shape, the cavity, the shape of the small hole of the dense cloth, the angle of the center line, and the like may all be changed according to the specific conditions that satisfy the enhanced heat transfer, and are not limited to these shapes, and may have more forms.

Figure 2 is a schematic diagram showing the principle of heat transfer in the top of a ceramic kiln. It is an example of absorbing the heat in the fluid and converting it into radiant heat to the ceramic placed on the bottom of the furnace. This kind of situation is mostly used in the surface of the furnace or the furnace wall of the metallurgical furnace, ceramic kiln and so on. At these locations, an enhanced convective heat transfer mesh honeycomb package is provided to enhance convective heat transfer and transfer to the heated object. As shown in FIG. 2, wherein the refractory brick 2 is an insulating refractory material, when the hot flue gas 4 flows through the mesh honeycomb package 1-1 and the mesh honeycomb package 1-2, the hot flue gas 4 is divided into a plurality of fine streams 7 into and out of the honeycomb package. In the process of densely venting the holes, the convection area is greatly increased, and at the same time, numerous turbulences 6 are generated, which improves the convective heat transfer coefficient. According to the convective heat transfer calculation formula, the convective heat transfer amount and the area and convective heat transfer coefficient are positive when the fluid flow rate and the temperature and pressure are the same. ratio. Therefore, the mesh honeycomb package 1-1 and the mesh honeycomb package 1-2 absorb the thermal energy in the large amount of hot flue gas 4, since the refractory brick 2 is a thermal insulator, the mesh honeycomb package 1-1 and the mesh honeycomb package 1 - 2 The absorbed heat can raise its own temperature and convert thermal energy into radiant energy to maintain its own thermal balance. Due to the open cavity in the cell honeycomb package and the regular arrangement of the cell honeycomb package, a certain direction of open cavity is also formed between the cell honeycomb package and the mesh honeycomb package, and these open cavities will The radiation ray 5 emitted from the mesh honeycomb package and the refractory brick 2 is emitted in the designed direction and heated to the object to be heated, thereby forming a high-strength transfer-enhanced heat transfer on the top of the furnace.

The mesh heat-enhancing mesh honeycomb package of the invention can be applied to various fields. In the field of fire industrial furnace, the enhanced heat transfer mesh honeycomb package is placed on the furnace wall or the top lining of the furnace, thereby forming a novel type. Energy-saving industrial furnace. As the hot flue gas flows in the furnace, the hot flue gas enters and exits the cell honeycomb to transfer a large amount of thermal energy to the metal or refractory material constituting the cell honeycomb package, and the metal or refractory material of the cell honeycomb package is heated to generate heat radiation, and The directional air opening surrounded by the cavity on the mesh honeycomb package and the ordered array of mesh cells is directionally transmitted to the object to be heated - that is, the mesh honeycomb package enhances the conversion of heat inside the hot smoke into radiant energy. It is transmitted to the heated object to prevent the effective heat energy in the hot flue gas from being discharged, which can produce obvious energy saving effect.

As shown in Fig. 4, the enhanced heat transfer mesh honeycomb packages 1-1 and 1-2 are integrated with the industrial kiln-lined refractory brick 2 for forming a vault on the top of the furnace.

As shown in Fig. 5, the enhanced heat transfer mesh honeycomb package 1-3 is integrated with the industrial kiln lined square refractory brick 3 for the furnace wall. At the same time, all surfaces of the cell honeycomb package are coated with far infrared radiation material in order to increase the radiation of the honeycomb package.

3 is a schematic view of a fire industrial kiln including a furnace bottom 9, a furnace wall 10, a furnace roof 11, a furnace door, a furnace bottom 9, a furnace wall 10, a furnace roof 11, and a furnace. The door is composed of a furnace, the bottom of the furnace is placed with the object 8 to be heated, and the rest is a hot air chamber; the inner top of the furnace 11 is provided with an enhanced heat transfer mesh honeycomb package 1-1 or / and is placed on the inner wall of the furnace wall 10 There are enhanced heat transfer mesh honeycomb packages 1-3.

A further embodiment of the present invention is: a kiln comprising a furnace consisting of a furnace bottom, a furnace wall, a furnace roof, and a furnace door, wherein an object to be heated is placed at the bottom of the furnace; wherein, on the object to be heated A mesh honeycomb package with the aforementioned enhanced heat transfer is provided.

The method of the invention creates a technical solution for enhancing heat transfer in the field of thermal engineering. It can change the heat energy efficiency of many kinds of thermal energy equipment and produce obvious energy saving effect.

In conclusion, the above embodiments are only used to explain the technical solutions of the present invention, and are not limited thereto; although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still The technical solutions described in the above embodiments are modified, or equivalent to some of the technical features are included; and the modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

The invention relates to a mesh honeycomb package for enhancing heat transfer, which is characterized in that: a hole is provided which communicates with each other from an outer surface to an inner dense, and the top cross-sectional area of the mesh honeycomb package is the cross-sectional area of the bottom, the angle between the geometric center line and the bottom section. 15°‐90°.
The heat-enhanced mesh honeycomb package of claim 1 wherein said mesh honeycomb package is provided with one or more cavities that open in the same direction.
The heat-enhanced mesh honeycomb package according to claim 1, wherein the mesh honeycomb package has a cross-sectional shape of a circular, square or other shape.
The heat-enhanced mesh honeycomb package according to any one of claims 1 to 3, wherein the mesh honeycomb package is a boss type or a flat type, and all surfaces of the mesh honeycomb package are coated with a far infrared radiation material. .
An industrial kiln comprising a furnace consisting of a furnace bottom, a furnace wall, a furnace roof, and a furnace door, the object to be heated being placed at the bottom of the furnace; characterized by: lining the furnace roof or/and the furnace wall The mesh lining of the heat transfer enhancement of claim 1 is provided on the inner liner.
An industrial kiln comprising a furnace consisting of a furnace bottom, a furnace wall, a furnace top, and a furnace door, the object to be heated being placed at the bottom of the furnace; characterized in that: the object to be heated is provided with claim 1 The enhanced heat transfer mesh honeycomb package.
The industrial furnace according to claim 5 or 6, wherein said mesh honeycomb package is provided with one or more cavities that open in the same direction.
The industrial furnace according to claim 5 or 6, wherein the mesh honeycomb package has a circular, square or variable cross section.
The industrial furnace according to claim 5, wherein said mesh honeycomb package is in the shape of a boss, and all surfaces of the mesh honeycomb package are coated with a far infrared radiation material.