Heating device for catalytic conversion of organic waste gases

Abstract

The application discloses a heating device for organic waste gas catalytic reaction, belongs to the technical field of organic waste gas treatment, and comprises a heating pipe and a heat dissipation pipe fixedly welded with the heating pipe in an integrated mode, the heating pipe and the heat dissipation pipe jointly form a heat pipe assembly with a continuous cavity in the pipe, heat conducting oil is used to flow in the heat pipe assembly, and heat oil circulating devices are connected to two ends of the heat pipe assembly; an induction coil is arranged outside the heating pipe, the induction coil is electrically connected with a heating control assembly, the heating control assembly controls the induction coil to intermittently heat the heating pipe, the heating pipe directly conducts heat to the heat dissipation pipe after being heated by the induction coil, and the heat dissipation pipe is indirectly conducted heat by the heat conducting oil flowing in the heat pipe assembly, and the heat pipe assembly heats the organic waste gas passing outside. The application has the advantages of small installed power, less additional investment, low operation cost and less secondary pollution.

Description

Technical Field

[0001] This invention relates to the field of organic waste gas treatment technology, and in particular to a heating device for catalytic reaction of organic waste gas. Background Technology

[0002] Catalytic combustion of organic waste gas is one of the most widely used methods for treating organic waste gas. It involves heating a mixture of organic waste gas and catalyst to a specified temperature (typically 240℃~280℃) in a heating device, causing the organic components in the waste gas to be catalytically oxidized into carbon dioxide and water. Currently, the heating of the waste gas during the catalytic reaction mainly uses two methods: electric heating and gas heating.

[0003] Electric heating uses finned heating tubes to heat the organic waste gas until the reaction temperature is reached, at which point the organic components undergo catalytic oxidation under the action of a catalyst. However, this method requires a large installed capacity and high-capacity power distribution station. Most users need to upgrade their power distribution stations, resulting in higher power consumption and operating costs.

[0004] Gas-fired heating involves burning natural gas in a burner, using the resulting high-temperature gas to heat organic waste gas. When the reaction temperature is reached, the organic components undergo catalytic oxidation under the action of a catalyst. However, this method requires a natural gas source provided by the manufacturer, such as connecting to a natural gas pipeline or installing a natural gas storage tank. This results in significant additional investment in equipment and higher operating costs. Furthermore, there is a risk of incomplete combustion of natural gas. Incomplete combustion of natural gas can easily produce nitrogen oxides, sulfur oxides, and other gaseous substances. These substances cannot react under the original catalyst, leading to secondary pollution problems.

[0005] Therefore, a new method for heating exhaust gas is needed to reduce operating costs and secondary pollution while lowering installed power and additional investment. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a heating device for catalytic reaction of organic waste gas with low installed power, low additional investment, low operating cost and low secondary pollution.

[0007] To solve the above-mentioned technical problems, the technical solution of the present invention is: a heating device for catalytic reaction of organic waste gas, comprising a heating tube and a heat dissipation tube integrally welded and fixed to the heating tube, the heating tube and the heat dissipation tube together constituting a heat pipe assembly with a continuous internal cavity, the heat pipe assembly for circulating heat transfer oil, and the two ends of the heat pipe assembly being connected to a hot oil circulation device; an induction coil is provided outside the heating tube, the induction coil being electrically connected to a heating control component, the heating control component controlling the induction coil to intermittently heat the heating tube; after being heated by the induction coil, the heating tube directly conducts heat to the heat dissipation tube, and indirectly conducts heat to the heat dissipation tube through the heat transfer oil flowing inside the heat pipe assembly, the heat pipe assembly heating the organic waste gas passing through.

[0008] As a preferred technical solution, the heating tube in the heat pipe assembly is provided with at least two sections, and the heating control assembly includes a heating switching mechanism for controlling the induction coils at each of the heating tubes to be energized respectively. The heating switching mechanism controls one of the induction coils to heat the corresponding heating tube to at least 600°C, and then switches to control the next induction coil to heat the corresponding heating tube. The heating switching mechanism is electrically connected to a coaxial transformer and a heating control cabinet.

[0009] As a preferred technical solution, the heating switching mechanism includes a switching mechanism mounting frame. A first copper column and a second copper column, which are electrically connected to the two output terminals of the coaxial transformer, are fixed on the switching mechanism mounting frame. A first copper rod and a second copper rod are electrically connected to the two ends of each induction coil, respectively. The second copper rod is directly connected to the second copper column. A flexible copper strip is connected to the first copper rod. The switching mechanism mounting frame is provided with a switching driver that can make the flexible copper strip contact or separate from the first copper column.

[0010] As a preferred technical solution, the induction coil includes at least two induction sub-coils arranged sequentially along the length direction of the corresponding heating tube. One end of each induction sub-coil is connected to a first copper tube, which is fixedly connected to a first copper rod. The other end of each induction sub-coil is connected to a second copper tube, which is fixedly connected to a second copper rod.

[0011] As a preferred technical solution, both the first copper pipe and the second copper pipe are copper pipes with one end closed and the other end being a copper pipe inlet; the first copper rod, the second copper rod, the first copper column, and the second copper column are each hollow, the first copper rod and the second copper rod are both copper rods with one end connected to the corresponding copper pipe and the other end being a copper rod outlet, and the first copper column and the second copper column are both copper columns with one end being a copper column inlet and the other end being a copper column outlet; the inlet ends of the copper pipes and the inlet ends of the copper columns are connected to a cooling water pump, and the outlet ends of the copper rods and the outlet ends of the copper columns are connected to a cooling water tank, and the cooling water pump draws cooling water from the cooling water tank.

[0012] As a preferred technical solution, the heating control component controls the induction coil to be energized for 10s to 20s each time, and the induction coil heats the heating tube to at least 600°C each time.

[0013] As a preferred technical solution, the outer wall of the heat dissipation pipe is provided with heat dissipation fins.

[0014] As a preferred technical solution, the heat pipe assembly is arranged in a continuous S-shaped bend.

[0015] Due to the adoption of the above technical solution, the heating device for catalytic reaction of organic waste gas includes a heating tube and a heat dissipation tube integrally welded and fixed to the heating tube. The heating tube and the heat dissipation tube together constitute a heat pipe assembly with a continuous internal cavity. Heat transfer oil flows within the heat pipe assembly, and both ends of the heat pipe assembly are connected to a hot oil circulation device. An induction coil is provided outside the heating tube, and the induction coil is electrically connected to a heating control component. The heating control component controls the induction coil to intermittently heat the heating tube. After being heated by the induction coil, the heating tube directly conducts heat to the heat dissipation tube and indirectly conducts heat to the heat dissipation tube through the heat transfer oil flowing within the heat pipe assembly. The heat pipe assembly heats the organic waste gas passing through. This invention forms a heat pipe assembly with the heating tube and the heat dissipation tube as a whole. After each heating of the heating tube by the induction coil, the heating tube rapidly transfers heat to the heat dissipation tube through direct and indirect means, resulting in high heat transfer efficiency and rapid overall heating of the heat pipe assembly, enabling rapid and comprehensive heating of the organic waste gas. The heating mainly comes from the induction coil, which heats intermittently. Therefore, the installed power of the whole unit is small. It does not require the expansion of the substation or the provision of natural gas source. The additional investment is small, the operating cost is low, and there is no risk of generating gases such as nitrogen oxides and sulfur oxides, resulting in less secondary pollution. Attached Figure Description

[0016] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the invention. Wherein: Figure 1 This is a schematic diagram of the structural principle of Embodiment 1 of the present invention; Figure 2 This is a three-dimensional structural schematic diagram of the heat pipe assembly according to Embodiment 1 of the present invention; Figure 3 This is a three-dimensional structural diagram of one of the induction coils in Embodiment 1 of the present invention; Figure 4 This is a three-dimensional structural schematic diagram of the heating switching mechanism according to Embodiment 1 of the present invention; Figure 5 This is a three-dimensional structural schematic diagram of the heat pipe assembly according to Embodiment 2 of the present invention; Figure 6 This is a three-dimensional structural schematic diagram of the heating switching mechanism in Embodiment 2 of the present invention.

[0017] In the diagram: 1-Heat pipe assembly; 11-Heating pipe; 12-Heat dissipation pipe; 13-Heat dissipation fins; 2-Hot oil circulation device; 21-Hot oil circulation pump; 22-Hot oil tank; 3-Induction coil; 31-Induction sub-coil; 4-Heating control assembly; 41-Coaxial transformer; 42-Heating control cabinet; 5-Heating switching mechanism; 51-Switching mechanism mounting frame; 52-First copper column; 53-Second copper column; 54-First copper rod; 55-Second copper rod; 56-Flexible copper strip; 57-On / off actuator; 571-On / off actuator cylinder; 572-Ceramic connector; 61-First copper pipe; 62-Second copper pipe; 63-Copper pipe inlet; 64-Copper rod outlet; 65-Copper column inlet; 66-Copper column outlet; 67-Cooling water supply pump; 68-Cooling water tank; 69-Cooling tower. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, exemplary embodiments of the invention are described only by way of illustration. It will be readily apparent to those skilled in the art that various modifications can be made to the described embodiments without departing from the spirit and scope of the invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0019] Example 1: As Figures 1 to 4 As shown, the heating device for catalytic reaction of organic waste gas includes a heating tube 11 and a heat dissipation tube 12 integrally welded and fixed to the heating tube 11. The heating tube 11 and the heat dissipation tube 12 together constitute a heat pipe assembly 1 with a continuous inner cavity. Preferably, the heating tube 11 and the heat dissipation tube 12 are directly welded together to achieve direct and rapid heat conduction between them.

[0020] The heat pipe assembly 1 is used to circulate heat transfer oil. Both ends of the heat pipe assembly 1 are connected to a hot oil circulation device 2. In this embodiment, the heat transfer oil is used to ensure that heat is transferred more evenly to every part of the heat pipe assembly 1. Conventionally, the hot oil circulation device 2 includes a hot oil circulation pump 21 and a hot oil tank 22. The hot oil circulation pump 21 inputs the heat transfer oil from one end of the heat pipe assembly 1 into the hot oil tank 22, and the heat transfer oil flowing through the entire heat pipe assembly 1 returns to the hot oil tank 22 from the other end.

[0021] An induction coil 3 is provided outside the heating tube 11. The induction coil 3 is electrically connected to a heating control component 4. Conventionally, the heating control component 4 controls the induction coil 3 to perform ultrasonic heating on the heating tube 11. The principle of this ultrasonic electromagnetic heating is a well-known technology that is known to those skilled in the art and will not be described in detail here. Of course, the heating tube 11 is preferably made of a magnetically conductive material. In this embodiment, the heating control component 4 controls the induction coil 3 to intermittently heat the heating tube 11. This can prevent the induction coil 3 from burning or even melting the heating tube 11, reduce the impact of high temperature on the heat transfer oil, and reduce the installed power.

[0022] After being heated by the induction coil 3, the heating tube 11 directly conducts heat to the heat sink 12, and indirectly conducts heat to the heat sink 12 through the heat transfer oil flowing inside the heat pipe assembly 1. The heat transfer oil flowing through the heating tube 11 also cools it down, further reducing erosion. Through these direct and indirect heat conductions, heat from the heating tube 11 can be quickly transferred to the entire heat pipe assembly 1, resulting in rapid overall heating of the heat pipe assembly 1.

[0023] The heat pipe assembly 1 heats the organic waste gas passing through it. Based on the rapid overall heating characteristic of the heat pipe assembly 1, it can quickly achieve uniform heating of the organic waste gas. Preferably, the outer wall of the heat dissipation pipe 12 is provided with heat dissipation fins 13 to increase the contact area with the organic waste gas and improve the heating effect on the flowing organic waste gas. Preferably, the heat pipe assembly 1 is arranged in a continuous S-shaped bend, so that the heat pipe assembly 1 can fill the flow channel of the organic waste gas to a greater extent, further improving the heating effect on the organic waste gas.

[0024] In actual installation, the heat pipe assembly 1 can also be formed in two layers. That is, the heat pipe assembly 1 bends in an S-shape from one side wall of the organic waste gas flow channel to the opposite side wall, then bends upstream or downstream in the flow direction, and then bends back in an S-shape to the initial side wall, forming a two-layer configuration. Of course, the straight segments in the return bending path can be staggered with the straight segments of the first layer in the waste gas flow direction, or directly intersect with the straight segments of the first layer, to further improve the contact with the organic waste gas and further improve the waste gas heating effect. This embodiment illustrates a structure in which the straight segments of the two layers are staggered in the waste gas flow direction.

[0025] Preferably, the heating control component 4 controls the induction coil 3 to be energized for 10s to 20s each time, and the induction coil 3 heats the heating tube 11 to at least 600°C each time, so as to rapidly raise the temperature of the heating tube 11 in a short time each time, which can further reduce the impact of high temperature on the heat transfer oil while ensuring the overall heating effect of the heat pipe assembly 1.

[0026] The heat pipe assembly 1 has at least two heating pipes 11. The heating control assembly 4 includes a heating switching mechanism 5 for controlling the energization of the induction coils 3 at each heating pipe 11. The heating switching mechanism 5 controls one of the induction coils 3 to heat the corresponding heating pipe 11 to at least 600°C, and then switches to control the next induction coil 3 to heat the corresponding heating pipe 11. The heating switching mechanism 5 is electrically connected to a coaxial transformer 41 and a heating control cabinet 42. By setting multiple heating pipes 11 and controlling their sequential heating, this embodiment can adapt to heating applications with larger flow channels or higher airflow velocities of organic waste gas while ensuring that the heating pipes 11 do not burn and the heat transfer oil is not affected by high temperatures. This embodiment illustrates the use of two heating pipes 11 in the heat pipe assembly 1.

[0027] The heating switching mechanism 5 includes a switching mechanism mounting frame 51. A first copper column 52 and a second copper column 53, which are electrically connected to the two output terminals of the coaxial transformer 41, are fixed on the switching mechanism mounting frame 51. A first copper rod 54 and a second copper rod 55 are electrically connected to the two ends of each induction coil 3, respectively. The second copper rod 55 is directly connected to the second copper column 53. A flexible copper strip 56 is connected to the first copper rod 54. The switching mechanism mounting frame 51 is provided with a switching driver 57 that can make the flexible copper strip 56 contact or separate from the first copper column 52.

[0028] The on / off actuator 57 drives the corresponding flexible copper strip 56 to contact the first copper pillar 52, thereby energizing the corresponding induction coil 3; conversely, the on / off actuator 57 drives the corresponding flexible copper strip 56 to separate from the first copper pillar 52, thereby de-energizing the corresponding induction coil 3. In this embodiment, the on / off actuator 57 includes an on / off drive cylinder 571 mounted on the switching mechanism mounting bracket 51. A ceramic connector 572 connected to the flexible copper strip 56 is fixedly mounted on the piston rod of the on / off drive cylinder 571, and the extension and retraction of the on / off drive cylinder 571 realizes the on / off switching of the corresponding induction coil 3.

[0029] In actual operation, the induction coil 3, the first copper rod 54, the second copper rod 55, the first copper column 52, and the second copper column 53, as energized structures, all require water cooling. In this embodiment, the induction coil 3 includes at least two induction sub-coils 31 arranged sequentially along the length of the corresponding heating tube 11. One end of each induction sub-coil 31 is connected to a first copper tube 61, which is fixedly connected to the first copper rod 54. The other end of each induction sub-coil 31 is connected to a second copper tube 62, which is fixedly connected to the second copper rod 55.

[0030] Both the first copper pipe 61 and the second copper pipe 62 are copper pipes with one end closed and the other end being a copper pipe inlet 63; the first copper rod 54, the second copper rod 55, the first copper column 52, and the second copper column 53 are hollow. The first copper rod 54 and the second copper rod 55 are copper rods with one end connected to the corresponding copper pipe and the other end being a copper rod outlet 64. The first copper column 52 and the second copper column 53 are copper columns with one end being a copper column inlet 65 and the other end being a copper column outlet 66; the copper pipe inlet 63 and the copper column inlet 65 are connected to a cooling water pump 67, and the copper rod outlet 64 and the copper column outlet 66 are connected to a cooling water tank 68. The cooling water pump 67 draws cooling water from the cooling water tank 68.

[0031] By configuring the induction coil 3 as a plurality of induction sub-coils 31 connected in parallel, the induction coil 3 can achieve greater cooling and temperature control through the corresponding first copper pipe 61 and second copper pipe 62. Of course, the cooling water tank 68 can be connected to the cooling water tower 69 through other heat exchange mechanisms or directly through pipes to ensure a low water temperature at the cooling water tank 68. This embodiment illustrates water circulation with the cooling water tower 69.

[0032] In this embodiment, the heating tube 11 and the heat dissipation tube 12 are integrated into a heat pipe assembly 1. After each heating of the heating tube 11 by the induction coil 3, the heating tube 11 rapidly transfers heat to the heat dissipation tube 12 through direct and indirect means, resulting in high heat transfer efficiency and rapid overall heating of the heat pipe assembly 1, enabling rapid and comprehensive heating of the organic waste gas. The short-term rapid temperature increase at the heating tube 11 each time prevents erosion of the heating tube 11. Furthermore, based on the aforementioned efficient heat transfer, the impact of high temperatures on the heat transfer oil is reduced, thus enabling this embodiment to operate stably for extended periods. In this embodiment, heating primarily comes from the induction coil 3, which operates intermittently. Even with multiple sets of heating tubes 11 and induction coils 3, the sequential heating control ensures that only one induction coil 3 is energized and working at any given time. Therefore, the overall installed power is small, requiring neither capacity expansion of the substation nor the provision of a natural gas source, resulting in low additional investment and low operating costs. For example, for organic waste gas with a concentration of 2000 mg / m³ and an air volume of 5000 m³ / h, which needs to be heated to 260°C within 30 minutes, the existing electric heating method requires an installed power of approximately 270 kW, while the gas heating method requires an output of 300,000 kcal of heat. This embodiment, however, can achieve an installed power as low as 160 kW, reducing the installed power by approximately 40%, and also consuming less energy compared to the gas heating method. Furthermore, this embodiment eliminates the risk of generating gases such as nitrogen oxides and sulfur oxides, making it more environmentally friendly.

[0033] Example 2: Figure 5 and Figure 6 As shown, this embodiment, compared to embodiment one, mainly focuses on the structure of the heat pipe assembly 1 with four heating pipes 11 and the heating switching mechanism 5 that can control the power on and off of the four induction coils 3.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A heating device for catalytic reaction of organic waste gas, characterized in that: The device includes a heating tube and a heat dissipation tube integrally welded and fixed to the heating tube. The heating tube and the heat dissipation tube together constitute a heat pipe assembly with a continuous internal cavity. Heat transfer oil flows inside the heat pipe assembly, and both ends of the heat pipe assembly are connected to a hot oil circulation device. An induction coil is provided outside the heating tube, and the induction coil is electrically connected to a heating control component. The heating control component controls the induction coil to intermittently heat the heating tube. After being heated by the induction coil, the heating tube directly conducts heat to the heat dissipation tube and indirectly conducts heat to the heat dissipation tube through the heat transfer oil flowing inside the heat pipe assembly. The heat pipe assembly heats the organic waste gas passing through it. The heat pipe assembly has at least two sections for each heating pipe. The heating control assembly includes a heating switching mechanism for controlling the induction coils at each heating pipe to be energized. The heating switching mechanism controls one of the induction coils to heat the corresponding heating pipe to at least 600°C, and then switches to control the next induction coil to heat the corresponding heating pipe. The heating switching mechanism is electrically connected to a coaxial transformer and a heating control cabinet. The heating switching mechanism includes a switching mechanism mounting frame. A first copper column and a second copper column, which are electrically connected to the two output terminals of the coaxial transformer, are fixed on the switching mechanism mounting frame. A first copper rod and a second copper rod are electrically connected to the two ends of each induction coil, respectively. The second copper rod is directly connected to the second copper column. A flexible copper strip is connected to the first copper rod. The switching mechanism mounting frame is provided with a switching driver that can make the flexible copper strip contact or separate from the first copper column. The induction coil includes at least two induction sub-coils arranged sequentially along the length of the corresponding heating tube. One end of each induction sub-coil is connected to a first copper tube, which is fixedly connected to a first copper rod. The other end of each induction sub-coil is connected to a second copper tube, which is fixedly connected to a second copper rod.

2. The heating device for catalytic reaction of organic waste gas as described in claim 1, characterized in that: Both the first copper pipe and the second copper pipe are copper pipes that are closed at one end and have a copper pipe inlet at the other end; the first copper rod, the second copper rod, the first copper column, and the second copper column are all hollow. The first copper rod and the second copper rod are both copper rods that are connected to the corresponding copper pipe at one end and have a copper rod outlet at the other end. The first copper column and the second copper column are both copper columns that have a copper column inlet at one end and a copper column outlet at the other end; the copper pipe inlet and the copper column inlet are connected to a cooling water pump, and the copper rod outlet and the copper column outlet are connected to a cooling water tank. The cooling water pump draws cooling water from the cooling water tank.

3. The heating device for catalytic reaction of organic waste gas as described in claim 1, characterized in that: The heating control component controls the induction coil to be energized for 10s to 20s each time, and the induction coil heats the heating tube to at least 600°C each time.

4. The heating device for catalytic reaction of organic waste gas as described in claim 1, characterized in that: The outer wall of the heat dissipation pipe is provided with heat dissipation fins.

5. The heating device for catalytic reaction of organic waste gas as described in claim 1, characterized in that: The heat pipe assembly is arranged in a continuous S-shaped bend.

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