Fault diagnosis circuit for electric heating tube of electric heater of air separation device

Abstract

The utility model relates to a fault diagnosis circuit for an electric heating tube of an electric heater of an air separation unit, the fault diagnosis circuit comprises two current transformers, a light emitting diode and an adjustable resistor, the two current transformers are arranged close to an outgoing line of an electric heating tube bundle, the output ends of the current transformers are respectively connected with the light emitting diode and the adjustable resistor, and the adjustable resistor is connected with the light emitting diode. The light emitting diodes and the adjustable resistors are connected in parallel, the fault diagnosis circuit further comprises a panel, a plurality of fixing holes are formed in the panel in a square array mode, the light emitting diodes and the adjustable resistors are embedded in the fixing holes, and a numbering card is arranged on the panel close to the fixing holes. The electric heating tube bundle is provided with a wiring cover, and a number card is arranged on the wiring cover. According to the utility model, technicians can be helped to quickly judge the faulty tube bundle, so that the troubleshooting time of the electric heating tube is obviously shortened.

Description

Technical Field

[0001] The utility model belongs to the field of purifier regeneration of an air separation device, and particularly relates to a fault diagnosis circuit for an electric heating tube of an electric heater of an air separation device. Background Technique

[0002] For an air separation device, the regeneration of its purifier uses an electric heater with a rated power of 510 kW. The dirty nitrogen gas coming out of the air separation cold box is heated to 180 °C by the electric heater and then goes to regenerate the adsorbent in the purifier. It works once every 4 hours, and each heating lasts for 80 minutes. The electric heater is horizontally arranged and contains 32 groups of electric heating tube bundles. Each group of tube bundles consists of 3 electric heating tubes, which are connected in a triangular connection. The power of each electric heating tube is 5.31 kW, the power of each group of tube bundles is 15.93 kW, and the voltage is 380 V. Each group of tube bundles is fixed on the tube sheet of the electric heater through an M76×2 plug, and a section inside the shell is inserted into a corresponding steel pipe with a diameter of ∮89×4 and a length of L = 2550. 96 power supply lines come from the power distribution room and are respectively connected to the wiring terminals of the electric heating tubes in each group of tube bundles.

[0003] Due to faults such as burnout and internal heating wire breakage in the use of the electric heating tubes, the electric heating tubes cannot be used, and the power of the electric heater decreases accordingly, resulting in the dirty nitrogen gas not being able to be heated to the required temperature. When troubleshooting, it is necessary to measure and check each electric heating tube in each group of tube bundles one by one, which is time-consuming and laborious. Summary of the Invention

[0004] The utility model provides a fault diagnosis circuit for an electric heating tube of an electric heater of an air separation device to solve the problem that the troubleshooting operation of the existing electric heater of the air separation device is time-consuming and laborious. The circuit can help technicians quickly judge the faulty tube bundles, thus significantly shortening the troubleshooting time of the electric heating tubes.

[0005] To achieve the above object, the utility model proposes a fault diagnosis circuit for an electric heating tube of an electric heater of an air separation device, which includes a plurality of heating tubes. Three of the heating tubes are electrically connected in a triangular connection to form an electric heating tube bundle. The electric heating tube bundle is provided with a fault diagnosis circuit. The fault diagnosis circuit includes two current transformers, a light-emitting diode and a variable resistor. The two current transformers are arranged close to the outgoing line of the electric heating tube bundle. The output ends of the current transformers are respectively connected to the light-emitting diode and the variable resistor. The light-emitting diode and the variable resistor are connected in parallel. The fault diagnosis circuit further includes a panel. A plurality of fixing holes are arranged in a square array above the panel. The fixing holes are embedded with a plurality of the light-emitting diodes and variable resistors. Number cards are arranged on the panel close to the fixing holes;

[0006] The electric heating tube bundle is provided with a wiring cover, and number cards are arranged on the wiring cover.

[0007] Further, the electric heating tube bundle is provided with an outgoing line A, an outgoing line B and an outgoing line C;

[0008] Coils of current transformers are sleeved on any two phases of outgoing line A, outgoing line B and outgoing line C respectively.

[0009] Furthermore, the number of the light-emitting diodes is three, and the three light-emitting diodes are connected in series and then connected to the output end of the current transformer.

[0010] Furthermore, the fault diagnosis circuit is provided with a power supply box which is a square structure with an open side and a hollow interior. An outgoing line hole is arranged at the bottom of the power supply box, and a box door is hinged at the open position of the power supply box.

[0011] The power supply box is arranged to protect the fault diagnosis circuit.

[0012] Furthermore, the panel is a square plate, the number card is a square structure, and the number card is fixedly bonded to the panel.

[0013] Furthermore, the number card is bonded to the wiring cover.

[0014] The number card is set to number the electric heating bundles, which is convenient for managing multiple electric heating bundles. The numbers on the number card on the panel correspond to the numbers on the number card on the wiring cover one by one, which is convenient for quickly finding the faulty electric heating bundle.

[0015] Through the above technical solutions, the beneficial effects of the present utility model are as follows:

[0016] The present utility model can display the faulty electric heating bundles, significantly shortening the troubleshooting time of the electric heating tubes. Two current transformers are arranged at the outgoing line positions of the electric heating bundles. When the current of the outgoing line passes through the coils of the current transformers, the current transformers generate detection currents. The loop voltage is adjusted through the adjustable resistors. The current transformers are connected with light-emitting diodes, and the detection currents make the light-emitting diodes conduct and emit light. When any one of the electric heating tubes is disconnected, the line current becomes smaller, the detection current of the current transformer becomes smaller, the voltage of the light-emitting diode loop is insufficient, and the light-emitting diode is cut off. The light-emitting diodes are arranged on the panel and provided with number cards. Technicians can quickly find the number card at this position when seeing that the light-emitting diodes are not on, obtain the number from the number card, and then find the wiring cover where the number card with the same number is set, so as to find the faulty electric heating bundle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the circuit diagram of the electric heating tube fault diagnosis circuit of an air separation device electric heater of the present utility model;

[0018] Figure 2 is the structural schematic diagram of the electric heating bundle of the electric heating tube fault diagnosis circuit of an air separation device electric heater of the present utility model;

[0019] Figure 3Schematic diagram of the panel and power supply box structure of the electric heater heating tube fault diagnosis circuit for an air separation device of the present utility model.

[0020] Reference numerals in the appended drawings: 1 is the heating tube, 2 is the current transformer, 3 is the light-emitting diode, 4 is the adjustable resistor, 5 is the panel, 6 is the number card, 7 is the wiring cover, 8 is the power supply box, and 9 is the box door. Detailed implementation manners

[0021] The present utility model will be further described below in conjunction with the accompanying drawings and detailed implementation manners:

[0022] Embodiment 1

[0023] As Figures 1 to 3 shown, an electric heater heating tube fault diagnosis circuit for an air separation device includes a plurality of heating tubes 1. The three heating tubes 1 are electrically connected in a delta connection to form an electric heating bundle. It is characterized in that the electric heating bundle is provided with a fault diagnosis circuit. The fault diagnosis circuit includes two current transformers 2, a light-emitting diode 3, and an adjustable resistor 4. The two current transformers 2 are arranged close to the outgoing wires of the electric heating bundle. The output ends of the current transformers 2 are respectively connected to the light-emitting diode 3 and the adjustable resistor 4. The light-emitting diode 3 and the adjustable resistor 4 are connected in parallel. The fault diagnosis circuit further includes a panel 5. A plurality of fixing holes are arranged in a square array above the panel 5. A plurality of the light-emitting diodes 3 and the adjustable resistor 4 are embedded in the fixing holes. A number card 6 is arranged on the panel 5 close to the fixing holes;

[0024] The electric heating bundle is provided with a wiring cover 7, and a number card 6 is also arranged on the wiring cover 7.

[0025] The electric heating bundle is provided with outgoing wires A, B, and C;

[0026] The coils of the current transformers 2 are sleeved on any two phases of the outgoing wires A, B, and C respectively.

[0027] The number of the light-emitting diodes 3 is three. The three light-emitting diodes 3 are connected in series and then connected to the output end of the current transformer 2.

[0028] The fault diagnosis circuit is provided with a power supply box 8. The power supply box 8 is a square structure with one side open and hollow inside. An outgoing wire hole is arranged at the bottom of the power supply box 8. A box door 9 is hinged at the open position of the power supply box 8.

[0029] The panel 5 is a square plate, and the number card 6 is a square structure. The number card 6 is adhesively fixed to the panel 5.

[0030] The number card 6 is adhesively attached to the wiring cover 7.

[0031] In this embodiment, the current transformer 2 is a HCT209 type micro current transformer. In this embodiment, the number of electric heating tube bundles is 32, and the corresponding current transformers 2 are 64. Among them, there are 32 outgoing line A, 32 outgoing line B, 32 outgoing line C, and 32 number cards 6 are arranged on the wiring cover 7, which are respectively 1 to 32.

[0032] In this embodiment, the current transformer 2 is arranged on any two of the three outgoing lines of outgoing line A and outgoing line B or outgoing line C. Three of the light-emitting diodes 3 are in a group, and there are 64 groups of corresponding light-emitting diodes 3. The 64 groups of light-emitting diodes 3 are evenly distributed on the panel 5, and 64 number cards 6 are correspondingly arranged. There are 64 numbers arranged on the number card 6, which are respectively consistent with the corresponding electric heating tube bundle numbers, that is, 1-1, 1-2, 2-1, 2-2... 32-1 and 32-2.

[0033] During normal operation, the detection current output by the current transformer 2 can turn on the light-emitting diode 3, and the light-emitting diode 3 emits light.

[0034] In case of a fault, when any one of the heating tubes 1 in the delta-connected heating tubes 1 has a problem, two of the three line currents become smaller and one remains unchanged. Therefore, at least one of the detection currents of the two current transformers 2 will decrease. Taking the first electric heating tube bundle as an example, if one of the heating tubes 1 burns out, the circuit is equivalent to being disconnected, and the currents output by the two current transformers 2 become smaller, and the loop voltage changes. Therefore, the light-emitting diode 3 is turned off. The technician opens the box door 9 and can clearly see which group of light-emitting diodes 3 on the setting panel 5 is not lit. Then, through the number card 6, the corresponding number is obtained. At this time, the diodes 3 numbered 1-1 and 1-2 are not lit. Then, open the rain cover of the electric heater, find the wiring cover 7 numbered 1 on the number card 6, and then quickly find the position of the faulty electric heating tube bundle.

[0035] The above-mentioned embodiments are only the preferred embodiments of the present invention, and do not limit the implementation scope of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features and principles described in the scope of the present invention patent should be included in the scope of the patent application of the present invention.

Claims

1. A fault diagnosis circuit for electric heating tubes of an air separation unit electric heater, comprising a plurality of heating tubes (1), wherein three of the heating tubes (1) are electrically connected in a triangle connection to form an electric heating tube bundle, characterized in that: The electric heating tube bundle is provided with a fault diagnosis circuit, the fault diagnosis circuit comprising two current transformers (2), a light emitting diode (3) and an adjustable resistor (4), the two current transformers (2) being arranged close to the outlets of the electric heating tube bundle, the output ends of the current transformers (2) being connected to the light emitting diodes (3) and the adjustable resistor (4) respectively, the light emitting diodes (3) and the adjustable resistor (4) being connected in parallel, the fault diagnosis circuit also comprising a panel (5), a plurality of fixing holes being arranged in a square array on the panel (5), a plurality of the light emitting diodes (3) and the adjustable resistor (4) being embedded in the fixing holes, and a numbering card (6) being arranged on the panel (5) close to the fixing holes; The electric heating tube bundle is provided with a wiring cover (7), and a number card (6) is provided on the wiring cover (7).

2. The fault diagnosis circuit of the electric heater of an air separation unit according to claim 1 is characterized in that: The electric heating tube bundle is provided with an outlet line A, an outlet line B and an outlet line C; Coils of current transformers (2) are respectively provided on any two phases of outgoing line A, outgoing line B and outgoing line C.

3. The fault diagnosis circuit of the electric heater of an air separation unit according to claim 1 is characterized in that: The number of the light emitting diodes (3) is three, and the three light emitting diodes (3) are connected in series and connected to the output end of the current transformer (2).

4. The fault diagnosis circuit of the electric heater of an air separation unit according to claim 1 is characterized in that: The fault diagnosis circuit is provided with a power supply box (8), the power supply box (8) being a square structure with one side open and the interior hollow, a wire outlet hole being provided at the bottom of the power supply box (8), and a box door (9) being hingedly connected to the open position of the power supply box (8).

5. The fault diagnosis circuit of the electric heater of an air separation unit according to claim 1 is characterized in that: The panel (5) is a square plate, the number card (6) is a square structure, and the number card (6) is bonded and fixed to the panel (5).

6. The fault diagnosis circuit of the electric heater of the air separation unit according to claim 5 is characterized in that: The number card (6) is bonded onto the wiring cover (7).

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