CN211792090U

CN211792090U - Heating radiant tube with waste heat utilization device

Info

Publication number: CN211792090U
Application number: CN201922414290.5U
Authority: CN
Inventors: 倪高金; 陆秀栋
Original assignee: Jiangsu Jinda Electrical Heating Electrical Appliance Co ltd
Current assignee: Jiangsu Jinda Electrical Heating Electrical Appliance Co ltd
Priority date: 2019-12-29
Filing date: 2019-12-29
Publication date: 2020-10-27
Anticipated expiration: 2029-12-29

Abstract

The utility model provides a heating radiant tube with a waste heat utilization device, which comprises a radiant tube main body and a waste heat utilization device; the radiant tube main body comprises a connecting section and a hollow heating tube, the waste heat utilization device comprises an air inlet pipe, a heating section communicated with the air inlet pipe and an air outlet pipe communicated with the heating section, and the heating section is located inside the hollow heating tube. The radiant tube of the utility model is designed to be hollow, the weight of the material is only about 20 percent of the original weight, the material cost is obviously reduced, and the energy consumption required by heating is obviously reduced; the hollow pipe body is designed to provide possibility and convenience for the arrangement of the waste heat utilization device, and the waste heat utilization device is arranged on the radiant tube, so that on one hand, the heat in the radiant tube can be recycled, and the waste of energy is greatly reduced; on the other hand, the radiating tube can be radiated in time, the high-temperature oxidation of materials is reduced, and the service life of the radiating tube is prolonged.

Description

Heating radiant tube with waste heat utilization device

Technical Field

The utility model relates to an industry electrical heating technical field especially relates to a take waste heat utilization equipment's heating radiant tube.

Background

In the present industrial electric heating technology field, for example, the industrial boiler heating field, generally, the electric heating radiant tube with the built-in resistance wire of U-shaped or straight-shaped structure is used, one or more heating resistance wires are placed inside the sleeve of the radiant tube, and the resistance wire is fixed inside the sleeve by using the supporting framework, the manufacturing process of the electric heating tube is mature, although the process steps are more, the manufacture is relatively easy, and the manufacture is convenient, so that the electric heating tube is adopted in a large amount, but the electric heating tube also has a plurality of problems:

(1) the structure of the sleeve and the built-in resistance wire is adopted, so that the material consumption and the mass of the electric heating pipes are large, the weight of one group of heating pipes is 50-60 kilograms, and the material cost is high; because the electric heating pipe has large mass, the energy consumption required by heating is higher;

(2) the electric heating tube with the built-in resistance wire structure is characterized in that the internal resistance wire firstly generates heat and conducts to the sleeve, the sleeve radiates heat into the furnace, and a temperature gradient exists between the electric heating tube and the ambient temperature, for example, if the required ambient temperature is 900 ℃, the actual temperature of the resistance wire in the sleeve is 950 plus 1000 ℃, the resistance wire is greatly influenced by high-temperature oxidation, the service life of the resistance wire is shortened, namely the service life of the electric heating tube is influenced, and the maintenance cost of a client is increased;

(3) the electric heating pipe sleeve with the structure has thicker wall thickness and large surface load, an effective air circulation channel cannot be formed inside, the heat dissipation is slow, and the internal temperature is overhigh during use, so that the heating radiation pipe is easy to crack due to internal expansion; if the cooling process is to be accelerated, a cooling device or a cooling pipe is not needed to be additionally arranged beside the furnace, and the electric heating pipe is cooled by using the cooling device after the use is finished, so that the additional equipment investment is increased;

(4) because temperature gradients exist among the internal heating resistance wire, the sleeve with thicker wall thickness and the ambient temperature, the temperature control area of the electric heating tube is larger due to the influence of thermal inertia, for example, the actually required temperature in the furnace is 900 ℃, in order to reach the required furnace temperature, the actual temperature of the resistance wire during gradual heating needs to reach 950 plus material temperature 1000 ℃, the temperature in the furnace also gradually rises to exceed 900 ℃, when the temperature in the furnace is overhigh, the heating temperature of the resistance wire needs to be reduced, but the temperature reduction is always performed gradually due to the thermal inertia; conversely, when the temperature in the furnace becomes lower, the heating temperature of the resistance wires needs to be increased; therefore, the actual temperature in the furnace is difficult to be maintained stably at about 900 ℃, the larger the thickness and material mass of the heating tube is, the larger the thermal inertia influence is, and the smaller the temperature control precision is (the temperature control range is larger, generally +/-30 ℃).

Therefore, the sleeve type electric heating rod commonly used in the industrial electric heating field at present has the advantages of large material consumption, high cost, high energy consumption, large surface load and difficult heat dissipation, and is not in accordance with the green industrial production idea advocated by the state; and the temperature control precision is not very excellent, and the higher and higher use requirements of customers cannot be met.

In addition, the problem that waste heat cannot be utilized generally exists in the existing heating radiant tube, and great energy waste is caused.

SUMMERY OF THE UTILITY MODEL

To the technical problem, an object of the utility model is to provide a take waste heat utilization equipment's heating radiant tube can utilize the waste heat effectively, reduces the energy consumption and has saved the material quantity greatly, has good control by temperature change precision simultaneously.

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:

a heating radiant tube with a waste heat utilization device comprises a radiant tube main body and the waste heat utilization device; the radiant tube main body comprises a connecting section and a hollow heating tube, and the hollow heating tube is directly processed into a hollow tubular shape by electrothermal alloy; the upper part of the connecting section is provided with an electrode connecting part for realizing electric conduction during heating, a wiring terminal is arranged on the electrode connecting part, the lower part of the connecting section is a heat preservation section formed by packaging with a heat preservation material, a fixing plate is arranged at the joint of the electrode connecting part and the heat preservation section, and a sealing part is arranged at the joint of the fixing plate and the connecting section; the waste heat utilization device comprises an air inlet pipe, a heating section communicated with the air inlet pipe and an air outlet pipe communicated with the heating section, and the heating section is positioned in the hollow heating pipe.

Preferably, the heating section is arranged in a spiral or S-shaped structure.

Preferably, the part of the air outlet pipe exposed in the air is provided with a heat insulation layer.

Preferably, the heat-insulating layer comprises a foam heat-insulating layer arranged on the outer layer and a glass fiber heat-insulating layer arranged on the inner layer.

Preferably, the hollow heating pipes are arranged in pairs, the bottom ends of the hollow heating pipes are provided with connecting plates for sealing and electrically conducting the pipe bodies of the hollow heating pipes, and air outlets are formed in positions of the hollow heating pipes adjacent to the heat preservation sections.

Preferably, the hollow heating pipes are of U-shaped pipe structures which are arranged in pairs and are communicated with each other at the bottom ends through connecting pieces.

Preferably, a connecting part is arranged at the connecting part of the hollow heating pipe and the connecting section.

Still preferably, the wall thickness of the hollow heating tube is 2.5mm to 3.5 mm.

Still preferably, the diameter of the hollow heating pipe is designed to be 60-65 mm.

The utility model has the advantages that the radiant tube abandons the common design of adding the built-in resistance wire to the sleeve and adopts the new design of the hollow heating tube, the weight of the material is only about 20 percent of the original weight, the material cost is obviously reduced, and the energy consumption required by heating is obviously reduced; the hollow pipe body is designed to provide possibility and convenience for the arrangement of the waste heat utilization device, and the waste heat utilization device is arranged on the radiant tube, so that on one hand, the heat in the radiant tube can be recycled, and the waste of energy is greatly reduced; on the other hand, the radiating tube can be radiated in time, the high-temperature oxidation of materials is reduced, and the service life of the radiating tube is prolonged.

Drawings

Fig. 1 is a schematic structural diagram of a heating radiant tube with a waste heat utilization device according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a heating radiant tube with a waste heat utilization device according to another embodiment of the present invention.

Fig. 3 is an enlarged schematic structural view of the waste heat utilization device with the heating radiant tube of the waste heat utilization device of the present invention.

Detailed Description

In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.

It should be noted that in the description of the present invention, the terms "upper", "outer", "inner", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Please refer to fig. 1, which is a schematic structural diagram of a heating radiant tube with a waste heat utilization device according to an embodiment of the present invention, the heating radiant tube includes a heating radiant tube main body 101 and a waste heat utilization device 102; the radiant tube main body part comprises a connecting section 10 and a hollow heating tube 11, the hollow heating tube 11 is directly processed into a hollow tube shape by adopting an electrothermal alloy material (such as nickel-based superalloy Cr20Ni 80), and compared with the common design in the prior art, the design of the hollow heating tube greatly reduces the consumption of required materials, reduces the cost and provides possibility and convenience for the design of the waste heat utilization device 102; the upper part of the connecting section 10 is provided with an electrode connecting part for realizing electric conduction during heating, a wiring terminal 12 is arranged on the electrode connecting part, the lower part of the connecting section 10 is a heat preservation section 13 formed by packaging with a heat preservation material, and a fixing plate 14 for fixing the heating radiant tube and the boiler during actual production is arranged at the joint of the electrode connecting part and the heat preservation section 13; a sealing element 15 is arranged at the connecting part of the fixing plate 14 and the connecting section 10; in a preferred embodiment, the sealing element 15 is a ceramic sealing element with good sealing performance, corrosion resistance and high temperature resistance.

Referring to fig. 3, the waste heat utilization device 102 includes an air inlet tube 1021, a heating section 1024 communicated with the air inlet tube 1021, and an air outlet tube 1022 communicated with the heating section 1024, wherein the heating section 1024 is located inside the hollow heating tube 11, in a preferred embodiment, the heating section 1024 is configured in a spiral or S-shaped structure, so that the contact area of heat exchange and the volume of air inlet and outlet are increased, and the length of the heating section can be designed to be a suitable length according to the length, diameter, and the like of the specific hollow heating tube 11; in another preferred embodiment, the part of the air outlet pipe 1022 exposed in the air is provided with an insulating layer 1023, so that on one hand, the temperature loss of hot air can be reduced, and on the other hand, the injury of the heat pipe to personnel can be avoided; the heated hot gas output from the gas outlet pipe 1022 can be communicated to an industrial furnace or used as other heat supply sources of a plant area. Preferably, heat preservation 1023 is including locating outer foam insulation layer and locating nexine glass fiber thermal-insulation layer, compares in the design that only sets up single-deck foam insulation layer, and double-deck design has not only played better heat preservation effect, and the condition that foam insulation layer was scalded or leaded to its burning to appear by high temperature radiation heater's tail gas can be avoided to the glass fiber thermal-insulation layer, has reduced the potential safety hazard.

With continued reference to fig. 1, in one embodiment, the hollow heating pipes 11 are arranged in pairs, and the bottom end portions of the hollow heating pipes are provided with connecting plates 16 for closing and electrically connecting the pipe bodies of the hollow heating pipes 11, and the hollow heating pipes are provided with air outlet holes 18 at positions adjacent to the heat preservation sections 13; the connecting part of the hollow heating pipe 11 and the connecting section 10 can be connected by direct welding or welded and fixed by a connecting part 17, and the welding mode adopts circumferential seam full weld welding.

Preferably, the wall thickness of the hollow heating tube 11 is 2.5mm to 3.5 mm. The hollow heating pipe 11 is formed by directly rolling a pipe through a pipe manufacturing process by adopting high-temperature electrothermal alloy and then forming a sealed pipe body through plasma welding, when the wall thickness is thick, the pipe manufacturing is difficult, a regular pipe shape is not easy to form, and when the wall thickness is too large, the material cost and the energy consumption are increased; the too thin wall thickness can influence the intensity of heating radiant tube, takes place to warp easily, limits the wall thickness of heating body at 2.5-3.5mm, both can guarantee the demand of heating, has compromise the shaping rate, material cost and the energy consumption of pipe fitting processing simultaneously.

Preferably, the diameter of the hollow heating tube 11 is designed to be 60-65mm while taking into account the tube manufacturing process and the heating power of the high-temperature electrothermal alloy plate.

In another preferred embodiment, referring to fig. 2, the hollow heating tube 11 is a U-shaped tube structure with paired and bottom ends connected via a connector 16'.

The utility model abandons the common design of casing and built-in resistance wire, adopts the new design of hollow heating pipe, the weight of the material is only about 20 percent of the original weight, the material cost is obviously reduced, and the energy consumption required by heating is obviously reduced; the hollow pipe body is designed to provide possibility and convenience for the arrangement of the waste heat utilization device, and the waste heat utilization device is arranged on the radiant tube, so that on one hand, the heat in the radiant tube can be recycled, and the waste of energy is greatly reduced; on the other hand, the radiating tube can be radiated in time, the high-temperature oxidation of materials is reduced, and the service life of the radiating tube is prolonged.

The present invention has been described in relation to the above embodiments, which are only examples for implementing the present invention. It should be noted that the disclosed embodiments do not limit the scope of the present invention. On the contrary, all changes and modifications which do not depart from the spirit and scope of the present invention are deemed to fall within the scope of the present invention.

Claims

1. A heating radiant tube with a waste heat utilization device is characterized by comprising a radiant tube main body and the waste heat utilization device; the radiant tube main body comprises a connecting section and a hollow heating tube, and the hollow heating tube is directly processed into a hollow tubular shape by electrothermal alloy; the upper part of the connecting section is provided with an electrode connecting part for realizing electric conduction during heating, a wiring terminal is arranged on the electrode connecting part, the lower part of the connecting section is a heat preservation section formed by packaging with a heat preservation material, a fixing plate is arranged at the joint of the electrode connecting part and the heat preservation section, and a sealing part is arranged at the joint of the fixing plate and the connecting section; the waste heat utilization device comprises an air inlet pipe, a heating section communicated with the air inlet pipe and an air outlet pipe communicated with the heating section, and the heating section is positioned in the hollow heating pipe.

2. A heating radiant tube with a waste heat utilization device as claimed in claim 1, wherein the heating section is configured as a spiral or S-shaped structure.

3. The heating radiant tube with the waste heat utilization device as claimed in claim 1 or 2, wherein a portion of the air outlet tube exposed in the air is provided with an insulating layer.

4. The heating radiant tube with a waste heat utilization device as claimed in claim 3, wherein the insulation layer comprises a foam insulation layer arranged on an outer layer and a glass fiber insulation layer arranged on an inner layer.

5. The heating radiant tube with a waste heat utilizing device as claimed in claim 1 or 2, wherein the hollow heating tube is provided in pairs, and the bottom end portion of the hollow heating tube is provided with a connecting plate for closing and electrically connecting the tube body of the hollow heating tube, and the hollow heating tube is provided with an air outlet at a position adjacent to the heat retaining section.

6. The heating radiant tube with a waste heat utilization device as claimed in claim 1 or 2, wherein the hollow heating tube is a U-shaped tube structure which is arranged in pairs and the bottom end parts of which are connected and communicated through a connecting piece.

7. The heating radiant tube with a waste heat utilization device as claimed in claim 1 or 2, wherein a connecting part is provided at a connecting part of the hollow heating tube and the connecting section.

8. The heating radiant tube with a waste heat utilization device as claimed in claim 1 or 2, wherein the wall thickness of the hollow heating tube is 2.5mm to 3.5 mm.

9. The heating radiant tube with a waste heat utilization device as claimed in claim 8, wherein the diameter of the hollow heating tube is designed to be 60-65 mm.