Gas preheating device

Abstract

The present invention relates to a gas preheating device, comprising an outer tube assembly and an inner tube assembly; the outer tube assembly comprises a first sleeve and a second sleeve which are connected and installed in sequence from top to bottom, the tube diameter of the first sleeve is smaller than the tube diameter of the second sleeve, and a first internal thread is formed on the inner side wall of the second sleeve. The inner tube assembly comprises an inner tube joint, a gas pipe and a burner head, the inner tube joint is located on the outer side of the first sleeve and is fixedly connected to the upper end of the first sleeve, the inner tube joint is connected and installed on the upper end of the gas pipe, the gas pipe extends downward to the lower part of the second sleeve, the burner head is connected and installed on the lower end of the gas pipe, and the burner head is located inside the second sleeve; the inner side wall of the second sleeve is made into a threaded structure, which can effectively ensure the absorption of waste heat and transmit the waste heat to the gas pipe, thereby ensuring that the gas in the gas pipe is fully preheated, effectively increasing the heat transfer efficiency and reducing the heat loss.

Description

Technical Field

[0001] The invention relates to the technical field of carbon furnace gas preheating, and in particular to a gas preheating device. Background Art

[0002] Carbon baking furnace is a kind of thermal equipment that heats various carbon products after high pressure forming indirectly at the prescribed firing temperature under the condition of air isolation, so as to improve the electrical and thermal conductivity of the products and enhance the strength of the products.

[0003] Among them, the gas preheating device is an important structure of the carbon roasting furnace. It allows the preheated gas to be sent to the front of the burner nozzle with almost no heat dissipation loss, and is intensely mixed with the fuel for combustion. The combustion products are sprayed into the furnace space at high speed, ensuring sufficient and stable combustion. The gas preheating device generally includes an inner tube and an outer tube. The outer tube absorbs external heat and transmits it to the inner tube. In the prior art, the outer tube and the inner tube are both smooth straight tubes, which have large energy losses and low heat transfer efficiency between the inner and outer tubes, which is not conducive to full utilization of energy. Summary of the invention

[0004] Based on the above description, the present invention provides a gas preheating device to solve the problems in the prior art.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A gas preheating device comprises an outer tube assembly and an inner tube assembly;

[0007] The outer tube assembly comprises a first sleeve and a second sleeve which are connected and installed in sequence from top to bottom. The diameter of the first sleeve is smaller than the diameter of the second sleeve. A first internal thread is formed on the inner wall of the second sleeve.

[0008] The inner tube assembly includes an inner tube joint, a gas pipe and a burner head. The inner tube joint is located on the outside of the first sleeve and is fixedly connected to the upper end of the first sleeve. The inner tube joint is connected and installed on the upper end of the gas pipe. The gas pipe extends downward to the lower part of the second sleeve. The burner head is connected and installed on the lower end of the gas pipe. The burner head is located inside the second sleeve.

[0009] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0010] The present application provides a gas preheating device, in which the inner wall of the second sleeve is made into a threaded structure, which can effectively ensure the absorption of waste heat and transmit the waste heat to the gas pipe, ensuring that the gas in the gas pipe is fully preheated, effectively increasing the heat transfer efficiency and reducing heat loss.

[0011] Based on the above technical solution, the present invention can also be improved as follows.

[0012] Furthermore, the inner tube assembly also includes a diverter plate, which is installed at the lower end of the inner tube joint. The gas pipe includes a plurality of gas branches arranged in parallel. An injection cavity is formed inside the burner head, and a plurality of confluence ports corresponding to the gas branches are formed at the upper end of the injection cavity.

[0013] Furthermore, a second internal thread is formed on the inner wall of the burner head.

[0014] Furthermore, the injection chamber includes, from top to bottom, a confluence section, a transition section and an injection section which are connected in sequence. The confluence section and the transition section are cylindrical cavities, and the injection section is a conical cavity. The inner diameter of the confluence section is larger than the inner diameter of the transition section, and the inner diameter of the injection section gradually increases from top to bottom.

[0015] Furthermore, the first sleeve is a one-inch sleeve, the second sleeve is a two-inch sleeve, the gas branch pipe is a four-point pipe, and the burner head is a two-point burner head.

[0016] Furthermore, the number of the gas branch pipes is four, and the four gas branch pipes are distributed in a matrix structure of two rows and two columns.

[0017] Furthermore, it also includes a heat-insulating cover assembly, which includes a fixing ring and a heat-insulating cover. The fixing ring is sleeved on the outside of the first sleeve, and the heat-insulating cover is a conical cover with an upper end diameter smaller than a lower end diameter.

[0018] Furthermore, the burner head is made of a composite material having a temperature resistance of more than 1400° C., and the composite material is SUS314 stainless steel added with silicon carbide. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a gas preheating device provided in an embodiment of the present invention;

[0020] Figure 2 It is a schematic diagram of the specific structure of the inner tube assembly and the outer tube assembly;

[0021] Figure 3 for Figure 2 Schematic diagram of the distribution of gas branches;

[0022] Figure 4 for Figure 2 Schematic diagram of the structure of the middle burner head;

[0023] Figure 5 This is a flame combustion comparison chart. DETAILED DESCRIPTION

[0024] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0026] It will be appreciated that spatial relationship terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be appreciated that, in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0027] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. The "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0028] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0029] like Figures 1 to 4 As shown, the present application provides a gas preheating device, which is used for preheating gas of a carbon furnace, and includes an outer tube assembly 1 and an inner tube assembly 2.

[0030] Among them, the outer tube assembly 1 is mainly used to transfer external heat to the internal inner tube assembly 2, including a first sleeve 11 and a second sleeve 12 which are installed in sequence from top to bottom. The diameter of the first sleeve 11 is smaller than the diameter of the second sleeve 12, and the inner wall of the second sleeve 12 is formed with a first internal thread.

[0031] The inner tube assembly 2 is mainly used for the transportation of gas, wherein the inner tube assembly 2 comprises an inner tube joint 21, a gas pipe 22 and a burner head 23, wherein the inner tube joint 21 is located on the outer side of the first sleeve 11 and is fixedly connected to the upper end of the first sleeve 11, and the inner tube joint 21 is used to be connected to an external gas delivery pipeline, such as being connected to the outlet end of a gas purifier through a gas delivery pipeline; the lower end of the inner tube joint 21 is connected and installed on the upper end of the gas pipe 22, and the gas pipe 22 extends downward to the lower part of the second sleeve 12, and the gas pipe 22 extends in the first sleeve 12 and the second sleeve 12 so that the heat absorbed by the outer tube assembly 1 is fully transferred to the gas pipe; the burner head 23 is connected and installed on the lower end of the gas pipe 22, and the burner head 23 is located inside the second sleeve 12. The burner head 23 is located inside the second sleeve 12, which can effectively ensure that the gas is in the preheating range at the moment of being ejected from the burner head 23, thereby preventing heat from dissipating.

[0032] Specifically, the inner tube assembly also includes a diverter plate 24, which is installed at the lower end of the inner tube joint 21. The gas pipe 22 includes a plurality of gas branch pipes 221 arranged in parallel. An injection cavity 23a is formed inside the burner head 23, and a plurality of confluence ports corresponding to the gas branch pipes 221 are formed at the upper end of the injection cavity 23a.

[0033] Preferably, the number of the gas branch pipes 221 is four, and the four gas branch pipes 221 are distributed in a matrix structure of two rows and two columns. The structure of multiple gas branch pipes 221 can effectively increase the heat transfer area and divide the gas into four branches, so that the gas in each branch can be fully heated, and then when entering the injection chamber through the confluence port, the gas of multiple branches can be fully mixed to ensure the flame uniformity of the gas injection combustion.

[0034] More preferably, in order to mix the gas and air very quickly and fully promote the combustion of the gas, in this embodiment, the inner wall of the burner head 23 is formed with a second internal thread, and the internal thread structure of the inner wall of the burner head 23 can make the gas be swirled at the outlet. Figure 5 a. In the prior art, the flame of direct injection combustion is a single straight flame, the flame tongue has a high local temperature, the gas combustion space is small, and the combustion is not complete. Figure 5 b. The flame of the swirl jet is a circular columnar flame. The flame tongue covers a large space, the gas is in full contact with the flame, and the combustion is more complete and thorough, which effectively saves energy and ensures the full utilization of the gas.

[0035] In this embodiment, in order to ensure the injection force of the gas, the injection chamber 23a includes, from top to bottom, a confluence section a1, a transition section a2 and an injection section a3 which are connected in sequence. The confluence section a1 and the transition section a2 are cylindrical cavities, and the injection section a3 is a conical cavity. The inner diameter of the confluence section a1 is larger than the inner diameter of the transition section a2. By reducing the diameter size of the gas column flowing through, the circulation speed of the gas is effectively increased, providing more powerful power support for subsequent injection. The inner diameter of the injection section a3 gradually increases from top to bottom, and the conical nozzle ensures that the gas forms a larger annular columnar structure when it is ejected, so as to ensure sufficient combustion of the gas.

[0036] In a preferred embodiment of the present application, the first sleeve 11 is a one-inch sleeve, the second sleeve 12 is a two-inch sleeve, the gas branch pipe 221 is a quarter pipe, and the burner head 23 is a two-cent burner head. In this application, the inch refers to the imperial unit, that is, inches, which is a commonly used international unit in the field of pipeline transportation. According to the unit conversion relationship, 1 inch = 8 cents, that is, the quarter pipe is a pipeline with a diameter of 1 / 2 inch.

[0037] In order to further prevent heat loss, in a preferred embodiment of the present application, the gas preheating device also includes a thermal insulation cover assembly 3, which includes a fixing ring 31 and a thermal insulation cover 32, wherein the fixing ring 31 is sleeved on the outside of the first sleeve 11, and the thermal insulation cover 32 is a conical cover with an upper port diameter smaller than a lower port diameter.

[0038] In actual use, the insulation cover 32 covers a partial area of ​​the second sleeve 12, and the uncovered part extends into the interior of the carbon furnace mouth. In a specific implementation, the second sleeve 12 is about 500 mm long and the insulation cover 32 is about 400 mm high, which can prevent the temperature inside the cover from dropping. The heat is fully recovered by the second sleeve 12 inside the insulation cover 32 for preheating of the fuel gas, further improving the preheating effect.

[0039] In this embodiment, the burner head is made of SUS314 stainless steel with a temperature resistance of more than 1400°C and added with silicon carbide.

[0040] The present application provides a gas preheating device, in which the inner wall of the second sleeve 12 is made into a threaded structure, which can effectively ensure the absorption of waste heat and transmit the waste heat to the gas pipe 22, thereby ensuring that the gas in the gas pipe 22 is fully preheated, effectively increasing the heat transfer efficiency and reducing heat loss; the internal thread structure of the inner wall of the burner head 23 can make the gas be swirled at the outlet, so that the gas and the flame are fully in contact, the combustion is more complete and thorough, effectively saving energy and ensuring the full utilization of the gas; the insulation cover assembly 3 can prevent the temperature inside the cover from decreasing, and the heat is fully recovered by the second sleeve 12 inside the insulation cover 32.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas preheating device, characterized in that: comprising an outer tube assembly and an inner tube assembly; The outer tube assembly comprises a first sleeve and a second sleeve which are connected and installed in sequence from top to bottom, the diameter of the first sleeve is smaller than the diameter of the second sleeve, and a first internal thread is formed on the inner side wall of the second sleeve; The inner tube assembly includes an inner tube joint, a gas pipe and a burner head, wherein the inner tube joint is located outside the first sleeve and is fixedly connected to the upper end of the first sleeve, the inner tube joint is connected and installed at the upper end of the gas pipe, the gas pipe extends downward to the lower part of the second sleeve, the burner head is connected and installed at the lower end of the gas pipe, and the burner head is located inside the second sleeve; The inner tube assembly also includes a diverter plate, which is installed at the lower end of the inner tube joint. The gas pipe includes a plurality of gas branch pipes arranged in parallel. An injection chamber is formed inside the burner head. A plurality of confluence ports corresponding to the gas branch pipes are formed at the upper end of the injection chamber. The injection chamber includes, from top to bottom, a confluence section, a transition section and an injection section which are connected in sequence. The confluence section and the transition section are cylindrical cavities, and the injection section is a conical cavity. The inner diameter of the confluence section is larger than the inner diameter of the transition section, and the inner diameter of the injection section gradually increases from top to bottom.

2. The gas preheating device according to claim 1, characterized in that: The inner wall of the burner head is formed with a second internal thread.

3. The gas preheating device according to claim 2, characterized in that: The first sleeve is a one-inch sleeve, the second sleeve is a two-inch sleeve, the gas branch pipe is a four-inch pipe, and the burner head is a two-inch burner head.

4. The gas preheating device according to claim 3, characterized in that: The number of the gas branch pipes is four, and the four gas branch pipes are distributed in a matrix structure of two rows and two columns.

5. The gas preheating device according to claim 2, characterized in that: It also includes a heat-insulating cover assembly, which includes a fixing ring and a heat-insulating cover. The fixing ring is sleeved on the outside of the first sleeve, and the heat-insulating cover is a conical cover with an upper end diameter smaller than a lower end diameter.

6. The gas preheating device according to claim 2, characterized in that: The burner head is made of a composite material having a temperature resistance of more than 1400° C., and the composite material is SUS314 stainless steel added with silicon carbide.

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