Induction heating furnace system

Abstract

The utility model discloses an induction heating furnace system, and belongs to the technical field of new energy. According to the technical scheme, the device comprises a heating furnace system, and the heating furnace system is integrated with a heating element, a three-channel valve, a distribution collecting pipe and a control system; the heating element adopts a circumferential symmetric modular design, multi-section heating is realized, energy supply as required and accurate temperature control are realized, and the heating process requirements in the petrochemical industry field can be met; the heating furnace system can replace a traditional gas heating furnace, adopts green electric power resources as energy sources, avoids emission of a large amount of nitric oxide and oxycarbide, and is clean, environment-friendly, energy-saving and efficient. The novel heating furnace system can realize on-line replacement of heating elements, prolongs the production cycle, and can be widely applied to the field of practical chemical engineering.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, in particular to an induction heating furnace system. Background Art

[0002] At present, my country's petrochemical industry mostly uses gas-fired heating furnaces for raw material preheating, and the technology is relatively mature. The fuel gas heating furnace is mainly composed of burners installed on the side walls and bottom of the furnace. The fuel oil (gas) is sprayed into the furnace through the burners for combustion, and the generated flue gas flows through the convection section and is discharged from the chimney. Furnace tubes are installed in the radiation section, and the raw materials are heated to the required temperature in the furnace tubes. Existing gas-fired heating furnaces rely on radiation heat transfer to heat the furnace tubes, and the heat transfer efficiency is low. Although the flue gas can be used to preheat the raw materials or the air can be used to recover heat in the convection section, some heat is still carried into the atmosphere with the flue gas, resulting in energy waste. Gas-fired heating furnaces have problems such as insufficient temperature control, low intelligence, uneven heating of the furnace tubes, and increased coking risk; integrated waste heat recovery system, complex structure, and large equipment; and the furnace tubes of the heating furnace cannot be replaced online.

[0003] Against the backdrop of the global energy structure transitioning towards cleaner and low-carbon energy, the proportion of green electricity in my country (solar energy, wind energy, nuclear energy, hydropower, biomass energy and other resources) has increased year by year. The access of a large proportion of green electricity to the power grid has brought huge challenges to the stable operation of the power system. Solving the problem of green electricity absorption is the key to the large-scale and high-proportion development of renewable energy.

[0004] By replacing traditional fuels with green electricity resources, CO2 emissions from petrochemical plants can be reduced by more than 90%, promoting the realization of the country's 3060 "carbon peak and carbon neutrality" goals. Utility Model Content

[0005] In order to address the above-mentioned defects of gas heating furnaces and increase the consumption of green power resources, the utility model proposes an induction heating furnace system.

[0006] The utility model describes an induction heating furnace system, comprising heating elements, three-channel valves, a distribution collection pipe and a control system. Multiple groups of heating elements are connected through the distribution collection pipe, and three-channel valves are provided between different heating elements. The heating elements comprise heating furnace tubes, induction coils and a thermal insulation layer.

[0007] Preferably, the induction heating furnace system is composed of multiple groups of heating elements connected in series, the temperature rise gradient of a single heating element module is ΔT1=ΔT2=…=ΔTN, the length of the heating element is 3m, 4.5m, 6m, 9m, 12m, and the temperature rise range is 5~30℃. During implementation, the specifications of the heating element module can be determined based on the comprehensive factors of process requirements, physical properties of the heating medium and site space.

[0008] Preferably, a distribution collection pipe is provided between the different heating elements, and the corresponding three-way valve state can be adjusted to cut the heating element out of the industrial production process, and the coil or partial furnace tube can be replaced online.

[0009] Preferably, the heating furnace tubes in the heating element adopt even-numbered circumferentially symmetrical tube passes and odd-numbered circumferentially symmetrical tube passes and their tube layout structure, which is not limited to a single-tube multi-tube pass furnace tube structure, but also includes a multi-tube single-tube pass furnace tube structure.

[0010] Preferably, the specifications of the heating furnace tubes in the heating element are DN40, DN50, DN65, DN80, DN100, DN150, and DN200.

[0011] Preferably, the material of the heating furnace tube in the heating element is arranged in different regions according to the temperature rising trend, and is selected from one or a combination of two or more of carbon steel, stainless steel, and alloy.

[0012] Preferably, the induction coil adopts medium and low frequency heating with a heating frequency of 50 to 2500 Hz; the induction coil adopts a modular detachable design and is provided with multi-stage heating control, which is convenient for precise temperature control and timely detection of faulty coils. The detachable design facilitates timely replacement of faulty coils.

[0013] The utility model provides an induction heating furnace system. Compared with the existing technology, it has the following advantages:

[0014] (1) Using green electricity resources to replace fuel gas heating directly reduces carbon oxide and nitrogen oxide pollution caused by fossil fuel combustion, which is clean, environmentally friendly, green and efficient. At the same time, it prevents flue gas from carrying away waste heat and improves energy utilization efficiency.

[0015] (2) The induction heating furnace system breaks the existing heating furnace layout and sets up independent heating modules to achieve precise temperature control, uniform heating, and extend the production cycle; through the three-channel valve, the induction coil or furnace tube can be replaced online, increasing the flexibility of on-site maintenance.

[0016] (3) The induction heating furnace system eliminates the radiation furnace and waste heat recovery system. The furnace tube material is heated according to the process medium. The furnace tube can be made of different materials. The equipment investment is significantly reduced compared with traditional fuel heating.

[0017] (4) The induction heating furnace system eliminates the radiation furnace and waste heat recovery system, reducing equipment investment.

[0018] (5) The induction coil directly heats the furnace tube, with high heating efficiency, fast speed, uniform temperature in the heating area, and sufficient heating effect. At the same time, the furnace tube is segmented and heated on demand to maximize energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1This is the induction heating furnace system diagram.

[0020] Figure 2a Schematic diagram of an even-circularly symmetrical tube-pass heating furnace system.

[0021] Figure 2b Schematic diagram of an odd-circle symmetrical tube-pass heating furnace system.

[0022] Figure 3a Structure diagram of an even-numbered circularly symmetrical pipe pass (taking 4 pipe passes as an example).

[0023] Figure 3b Odd-circular symmetrical pipe structure diagram (taking 3 pipes as an example).

[0024] Figure 4 Diagram of segmented control of induction coil.

[0025] Figure: 1, heating element; 2, three-channel valve; 3, distribution manifold; 4, control system; 11, heating furnace tube; 12, induction coil; 13, thermal insulation layer; 101-10N, odd (even) pipe side heating element; 201-20N+1, odd (even) pipe side three-channel valve; 401-40N+1, odd (even) pipe side control unit; 4j1-4j n Segmented control unit. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are within the scope of protection of the present invention.

[0027] See also Figure 1-4 The utility model provides a technical solution: an induction heating furnace system, comprising:

[0028] Heating element (101, 102, 103, ..., 10N), three-channel valve (201, 202, 203, ..., 20N+1), distribution manifold (3) and control system (401 1，2，…，n , 402 1，2，…，n , 403 1，2，…，n ,…,40N 1，2，…，n ), the heating element consists of a heating furnace tube, an induction coil, and a thermal insulation layer.

[0029] Specifically, the temperature rise gradient of each heating element Ej is the same, and the length, number of furnace tube passes, and temperature rise range are determined comprehensively based on process calculations and specific on-site space requirements.

[0030] In this embodiment, the electromagnetic induction heating furnace system can be designed as an odd number or an even number of induction heating furnace tubes.

[0031] Specifically, when the heating furnace tubes are an even number of tube passes, the heating furnace system is as follows: Figure 2a As shown, the raw material enters from the right side, passes through the three-way valve 201 and enters the induction heating element 101 for heating, and then flows through each three-way valve and heating element for heating and then flows out from the left side of the system. Figure 2b As shown, the raw material enters from the right side, passes through the three-way valve 101 and enters the heating element 101 for heating, and then flows through each three-way valve and the induction heating element for heating and then flows out from the left side of the system.

[0032] In this embodiment, the induction heating furnace system is equipped with different induction heating elements 101, 102, 103, ..., 10N. Three-channel valves 201, 202, 203, ..., 20N+1 are installed between the different heating elements to adopt segmented heating, which facilitates timely detection of faults and allows for the timely removal and replacement of faulty elements.

[0033] Specifically, in normal production status, the three-channel valves are all in straight-through mode; when the heating element 10j fails, the valves Gj-1 and Gj+1 at both ends are adjusted to side-through mode, and this heating element is cut out of production, and the coil or local heating furnace tube can be replaced online.

[0034] In this embodiment, the material of the heating furnace tube is set in different areas and is selected from one or a combination of two or more of carbon steel, stainless steel, and alloy.

[0035] Specifically: For heating furnace systems with low temperatures and small temperature rise gradients during the entire heating process, the heating furnace tubes of each heating element are made of carbon steel; for heating furnace systems with high temperatures and small temperature rise gradients during the entire heating process, the heating furnace tubes of each heating element are made of high-temperature resistant alloy steel; for heating furnace systems with low initial temperatures and large temperature rise gradients during the entire heating process, carbon steel heating furnace tubes are used in the low-temperature zone and alloy heating furnace tubes are used in the high-temperature zone.

[0036] In this embodiment, each heating element of the induction heating furnace system is independently provided with a control system 401 1，2，…，n , 402 1，2，…，n , 403 1，2，…，n ,…,40N 1，2，…，n , a single heating element is provided with a segmented control system 40j1, 40j2, ..., 40j n .

[0037] Specifically, the induction heating furnace system flexibly adjusts the heating temperature according to the heating process, can grasp the temperature status of the heating surface of the heating furnace tube in real time, and realize zoned constant temperature control.

[0038] Specifically, the induction coil adopts medium and low frequency heating, with a heating frequency of 50 to 2500 Hz, and the actual frequency is determined according to the temperature requirement of the heating medium.

[0039] The utility model can be widely used in the field of petrochemical industry for replacing heating furnaces.

[0040] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An induction heating furnace system, characterized in that: include: Heating elements (1), three-channel valves (2), distribution manifolds (3) and a control system (4), wherein the heating elements (1) are connected via the distribution manifolds (3), and three-channel valves (2) are provided between different heating elements (1), wherein: A heating element (1) comprises a heating furnace tube (11), an induction coil (12), and a heat insulation layer (13).

2. The induction heating furnace system according to claim 1, characterized in that: The temperature rise gradient of a single module of the heating element (1) is ΔT1=ΔT2=…=ΔTN, the length of the heating element (1) is 3m, 4.5m, 6m, 9m, and 12m, and the temperature rise range of the heating element (1) is 5-30°C.

3. The induction heating furnace system according to claim 1, characterized in that: The heating furnace tube (11) is arranged with an odd-numbered circumferentially symmetrical tube pass and an even-numbered circumferentially symmetrical tube pass.

4. The induction heating furnace system according to claim 1, characterized in that: The heating furnace tube (11) has specifications of DN40, DN50, DN65, DN80, DN100, DN150, and DN200.

5. The induction heating furnace system according to claim 1, characterized in that: The heating furnace tube (11) can be arranged in different areas according to the material, and the material is selected from one or a combination of two or more of carbon steel, stainless steel, and alloy.

6. The induction heating furnace system according to claim 1, characterized in that: The induction coil (12) adopts medium and low frequency heating, with a heating frequency of 50 to 2500 Hz, and the induction coil (12) adopts a modular detachable structure.

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