Furnace leakage detection device for liquid metal catalytic cracking natural gas hydrogen production equipment

Abstract

According to the furnace leakage detection device for the liquid metal catalytic cracking natural gas hydrogen production equipment provided by the utility model, the plurality of probes are arranged in the furnace lining of the cracking furnace, and all the probes are electrically connected with the furnace bottom electrode of the cracking furnace by using the furnace leakage detection loop; the furnace leakage detection loop forms an electrifying loop when the liquid metal in the cracking furnace is in contact with any one of the probes; meanwhile, the current sensor and the voltage comparison circuit are used for detecting the current on the furnace leakage detection loop and the voltage of the specified connection node, so that the tiny damage of the furnace wall can be detected in advance, precious response processing time can be provided for operators, and the occurrence rate of furnace leakage events is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the safety monitoring technical field of industrial cracking equipment, specifically a furnace leakage detection device for liquid metal catalytic cracking natural gas hydrogen production equipment. BACKGROUND

[0002] The liquid metal catalytic cracking natural gas hydrogen production equipment is used for converting natural gas into high-value carbon materials and hydrogen. In the high-temperature liquid metal cracking process, the cracking furnace interior bears 1100 DEG C high temperature and 0.09MPa pressure, and the furnace wall material is long-term exposed to this extreme environment, and is extremely easy to wear, corrode or thermal fatigue, thereby causing the furnace wall damage, and causing the liquid metal leakage. Once the liquid metal leaks, not only will cause production interruption, but also can cause serious safety accidents, such as fire, explosion and environmental pollution etc.

[0003] At present, the existing furnace leakage detection technology mostly relies on temperature monitoring, pressure sensor or experience judgment, and these methods have the defects of response lag, limited detection range or difficult real-time monitoring, not only low efficiency, and cannot detect the furnace wall damage in advance, to reduce the occurrence rate of furnace leakage events. UTILITY MODEL CONTENT

[0004] In view of the above-mentioned deficiencies of the prior art, the purpose of the utility model is to provide a furnace leakage detection device for liquid metal catalytic cracking natural gas hydrogen production equipment, by setting up a furnace leakage detection loop to detect whether the probe inside the cracking furnace lining and the cracking furnace bottom electrode form a power supply loop, if the power supply loop is formed, it indicates that the liquid metal in the cracking furnace leaks from the furnace wall and contacts the probe, thereby realizing the early detection of the fine damage of the furnace wall, can provide valuable response processing time for the operator, and effectively reduces the occurrence rate of furnace leakage events.

[0005] To achieve the above-mentioned purpose of the invention, the utility model provides the following technical scheme:

[0006] A furnace leakage detection device for liquid metal catalytic cracking natural gas hydrogen production equipment, comprising:

[0007] A plurality of probes installed inside the cracking furnace lining;

[0008] A furnace leakage detection loop, one end of which is electrically connected with each probe, and the other end of which is electrically connected with the cracking furnace bottom electrode;

[0009] A current sensor for detecting the current passing through the furnace leakage detection loop;

[0010] A voltage comparison circuit for comparing the voltage of a specified connection node in the furnace leakage detection loop with the set threshold voltage, and outputting the corresponding switch signal based on the comparison result;

[0011] The leakage detection circuit is used to form a power supply circuit when the liquid metal in the cracking furnace contacts any of the probes.

[0012] According to a specific embodiment, the leakage detection device for the liquid metal catalytic cracking natural gas hydrogen production equipment provided by the utility model comprises a power supply, a plurality of series-connected resistors and at least one inductor.

[0013] Further, the leakage detection circuit further comprises a milliammeter, wherein the milliammeter is connected in series between the plurality of series-connected resistors, and a signal end of the milliammeter is electrically connected with the current sensor.

[0014] Further, the voltage comparison circuit comprises an operational amplifier, a transistor, a relay and at least three resistors.

[0015] Among the at least two resistors in the voltage comparison circuit, at least two resistors are connected in series to form a voltage dividing branch for input voltage, and a voltage dividing point of the voltage dividing branch is electrically connected with an inverting input end of the operational amplifier to provide the threshold voltage; one connection node of the plurality of series-connected resistors in the leakage detection circuit is electrically connected with a non-inverting input end of the operational amplifier to provide the voltage of the connection node in the leakage detection circuit.

[0016] An output end of the operational amplifier is electrically connected with a base of the transistor through one of the resistors, and an emitter of the transistor is grounded; a coil input end of the relay is connected with the input voltage, and a coil output end of the relay is electrically connected with a collector of the transistor, and the relay is used to generate the switching signal.

[0017] Further, one of the plurality of series-connected resistors in the leakage detection circuit is an adjustable resistor, wherein an adjusting end of the adjustable resistor is electrically connected with the non-inverting input end of the operational amplifier.

[0018] Further, one end of the voltage dividing branch is electrically connected with the positive pole of the power supply, and the other end is electrically connected with the negative pole of the power supply; the emitter of the transistor is electrically connected with the negative pole of the power supply to realize grounding.

[0019] According to a specific embodiment, the leakage detection device for the liquid metal catalytic cracking natural gas hydrogen production equipment provided by the utility model further comprises a control module, wherein the control module is electrically connected with the current sensor and the relay respectively to acquire the current signal collected by the current sensor and the switching signal of the relay.

[0020] Further, the control module is built-in with an A / D converter for converting the current signal collected by the current sensor into corresponding current data.

[0021] Further, the control module is used for determining whether to output a furnace leakage alarm signal and / or a furnace leakage early warning signal and / or a shutdown signal according to the current data and the switch signal.

[0022] According to a specific embodiment, the current sensor is a mutual inductor; the plurality of probes are arranged around the furnace wall of the cracking furnace, and the upper end of the probe extends close to the top of the cracking furnace, and the lower end of the probe extends close to the furnace bottom electrode of the cracking furnace.

[0023] Compared with the prior art, the utility model has the beneficial effects that:

[0024] 1. The furnace leakage detection device for the liquid metal catalytic cracking natural gas hydrogen production equipment, by installing a plurality of probes in the cracking furnace lining, and then connecting all the probes and the cracking furnace bottom electrode by the furnace leakage detection circuit, so that the furnace leakage detection circuit forms a power supply circuit when the liquid metal in the cracking furnace contacts any probe; at the same time, the current sensor and the voltage comparison circuit are used to detect the current on the furnace leakage detection circuit and the voltage of the specified connection node, so as to realize the early detection of the slight damage of the furnace wall, provide valuable response processing time for the operator, and effectively reduce the occurrence rate of the furnace leakage event.

[0025] 2. The furnace leakage detection device for the liquid metal catalytic cracking natural gas hydrogen production equipment, by setting up a milliammeter in the furnace leakage detection circuit, not only can detect the slight current and increase the current detection sensitivity, but also the signal end of the milliammeter is connected with the current sensor, so as to ensure that the current data collected by the current sensor is more accurate, and then ensure the accuracy of the detection of the slight damage of the furnace wall.

[0026] 3. The furnace leakage detection device for the liquid metal catalytic cracking natural gas hydrogen production equipment, the voltage comparison circuit uses the power supply of the furnace leakage detection circuit to obtain the input voltage and the threshold voltage generated based on the input voltage, realizes the operation of the operational amplifier and the triode, and simplifies the circuit structure of the furnace leakage detection device.

[0027] 4. The leak detection device for a liquid metal catalytic cracking natural gas hydrogen production equipment provided by this utility model has an adjustable resistor in one of the series resistors in the leak detection circuit. The adjustment terminal of the adjustable resistor is electrically connected to the non-inverting input terminal of the operational amplifier, which facilitates the adjustment of the detection threshold for leak events and avoids misjudgment, thus affecting production efficiency. Attached image description:

[0028] Figure 1 A schematic diagram of the circuit structure of the furnace leakage detection device for a liquid metal catalytic cracking natural gas hydrogen production equipment provided by this utility model;

[0029] Figure 2 This is a schematic diagram of the circuit structure in a specific embodiment of the present invention;

[0030] Figure 3 The circuit diagram of the leak detection device for a liquid metal catalytic cracking natural gas hydrogen production equipment provided by this utility model. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0032] like Figure 1 As shown, the leak detection device for a liquid metal catalytic cracking natural gas hydrogen production equipment provided by this utility model includes:

[0033] Several probes 201 are installed inside the lining of the cracking furnace;

[0034] The furnace leakage detection circuit 202 has one end electrically connected to each of the probes 201, and the other end electrically connected to the bottom electrode 104 of the pyrolysis furnace.

[0035] Current sensor 203 is used to detect the current passing through the furnace leakage detection circuit;

[0036] The voltage comparison circuit 204 is used to compare the voltage of a specified connection node in the furnace leakage detection circuit 202 with the magnitude of a set threshold voltage, and output a corresponding switching signal based on the comparison result.

[0037] The furnace leakage detection circuit 202 is used to form an energized circuit when the liquid metal 103 in the pyrolysis furnace comes into contact with any of the probes 201.

[0038] Specifically, the probe is arranged around the furnace wall of the cracking furnace, and the upper end of the probe extends close to the top of the cracking furnace, and the lower end of the probe extends close to the furnace bottom electrode of the cracking furnace, so that the all-around damage detection of the furnace wall can be realized; meanwhile, in order to facilitate connection with the furnace leakage detection circuit, each probe is electrically connected with each other, so that only one probe needs to be electrically connected with the furnace leakage detection circuit; the current sensor can adopt a mutual inductor or other current sensing device.

[0039] Specifically, the furnace leakage detection circuit 202 comprises a power supply, a plurality of series-connected resistors and at least one inductor; the positive electrode of the power supply is connected in series with the inductor through the plurality of series-connected resistors, the other end of the inductor is electrically connected with the probe 201, and the negative electrode of the power supply is electrically connected with the furnace bottom electrode 104 of the cracking furnace. Therefore, when the liquid metal 103 in the cracking furnace contacts any of the probes 201, the electrically conductive connection between the probe 201 and the furnace bottom electrode 104 of the cracking furnace is realized through the liquid metal 103, and since the power supply exists, an energized circuit is formed; at the same time, the current sensor 203 can detect the current passing through the furnace leakage detection circuit 202, and the voltage comparison circuit 204 can compare the voltage of the specified connection node in the furnace leakage detection circuit 202 with the set threshold voltage, and output the corresponding switching signal based on the comparison result. Therefore, by using the current sensor 203 and the voltage comparison circuit 204, the fine damage of the furnace wall can be detected in advance before the furnace leakage event occurs, which can provide valuable response processing time for the operator and effectively reduce the occurrence rate of the furnace leakage event.

[0040] Specifically, the voltage comparison circuit is mainly based on the application of an operational amplifier, and its basic working principle is to compare the voltages of the same-phase input end and the opposite-phase input end and output a high-level or low-level signal; in the voltage comparison circuit 204, the voltage of the specified connection node in the furnace leakage detection circuit 202 and a set threshold voltage are compared as two input voltages; since the furnace leakage detection circuit 202 has a plurality of resistors, different voltage drops will appear on different resistors after the energized circuit is formed, so one connection node is connected with one input end of the operational amplifier, and at the same time, the set threshold voltage can provide a reference voltage for comparison through a voltage stabilizing source, or a stable reference voltage can be provided through the furnace leakage detection circuit 202.

[0041] In one specific embodiment, as Figure 2As shown, in order to realize the processing of the current signal collected by the current sensor 203 and the switching signal output by the voltage comparison circuit 204, the leakage furnace detection device for the liquid metal catalytic cracking natural gas hydrogen production equipment provided by the utility model further comprises: a control module 205; the control module 205 can process and analyze the current signal and the switching signal, determine whether to output a leakage furnace alarm signal and / or a leakage furnace early warning signal and / or a shutdown signal according to the current data converted by the current signal and the switching signal, and remind the operator to carry out corresponding processing. Among them, the control module 205 can be realized by using a microcontroller or a programmable logic controller (PLC), and the programmable logic controller (PLC) is usually used in the industrial automation scene of the liquid metal catalytic cracking natural gas hydrogen production equipment.

[0042] As shown in the preferred embodiment, the leakage furnace detection device for the liquid metal catalytic cracking natural gas hydrogen production equipment provided by the utility model comprises a leakage furnace detection circuit, a current sensor 203, a voltage comparison circuit 204 and a control module 205. Figure 3 As shown, in order to realize the processing of the current signal collected by the current sensor 203 and the switching signal output by the voltage comparison circuit 204, the leakage furnace detection device for the liquid metal catalytic cracking natural gas hydrogen production equipment provided by the utility model further comprises: a control module 205; the control module 205 can process and analyze the current signal and the switching signal, determine whether to output a leakage furnace alarm signal and / or a leakage furnace early warning signal and / or a shutdown signal according to the current data converted by the current signal and the switching signal, and remind the operator to carry out corresponding processing. Among them, the control module 205 can be realized by using a microcontroller or a programmable logic controller (PLC), and the programmable logic controller (PLC) is usually used in the industrial automation scene of the liquid metal catalytic cracking natural gas hydrogen production equipment.

[0043] Meanwhile, the voltage comparison circuit comprises: an operational amplifier U1, a transistor Q1, a relay J and resistors R4-R7; wherein the resistors R4 and R5 in the voltage comparison circuit are connected in series to form a voltage dividing branch for input voltage, and one end of the voltage dividing branch is electrically connected with the positive pole of the power supply Vcc, and the other end is electrically connected with the negative pole of the power supply Vcc; in this way, the voltage dividing point of the voltage dividing branch (i.e. the connection node of the resistors R4 and R5) is electrically connected with the inverting input terminal of the operational amplifier to provide a stable threshold voltage; the resistor R1 in the leakage furnace detection loop is an adjustable resistor; and the adjusting end of the adjustable resistor is electrically connected with the non-inverting input terminal of the operational amplifier U1 to provide the voltage of one connection node in the leakage furnace detection loop; since the voltage comparison circuit obtains the input voltage from the power supply of the leakage furnace detection loop and generates the threshold voltage based on the input voltage, the operational amplifier and the transistor are enabled, so that the circuit structure of the leakage furnace detection device is more simplified; meanwhile, the resistor R1 in the leakage furnace detection loop is an adjustable resistor, and the adjusting end of the adjustable resistor is electrically connected with the non-inverting input terminal of the operational amplifier, so that the detection threshold for the leakage furnace event can be conveniently adjusted to avoid misjudgment and affect the production efficiency.

[0044] The output terminal of the operational amplifier U1 is electrically connected with the base of the transistor Q1 through the resistor R7, the emitter of the transistor Q1 is electrically connected with the negative pole of the power supply Vcc to realize grounding, the coil input terminal of the relay J is connected with the input voltage, and the coil output terminal is electrically connected with the collector of the transistor Q1, and the relay J is used to generate a switching signal; specifically, when the comparison result output of the voltage comparison circuit is high level, the transistor Q1 is turned on, and after the transistor Q1 is turned on, the two ends of the relay J are equivalent to being applied with the input voltage from the power supply Vcc, so that the relay J performs closing action and further generates a corresponding switching signal.

[0045] The control module adopts a programmable logic controller (PLC), and the current sensor adopts a transformer; wherein the PLC is electrically connected with the transformer and the relay J to obtain the current signal collected by the transformer and the switching signal of the relay J. Specifically, the built-in A / D converter of the PLC is used to convert the current signal collected by the transformer into corresponding current data, and the PLC further determines whether to output a leakage furnace alarm signal and / or a leakage furnace early warning signal and / or a shutdown signal according to the current data and the switching signal. In this way, by using the current signal collected by the transformer and the switching signal of the relay J, the present application can realize early detection of slight damage of the furnace wall before the leakage furnace event occurs, can provide valuable response processing time for the operator, and can effectively reduce the occurrence rate of the leakage furnace event.

[0046] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A leak detection device for a liquid metal catalytic cracking natural gas to hydrogen production equipment, characterized in that, include: Several probes installed inside the lining of the cracking furnace; A furnace leakage detection circuit, one end of which is electrically connected to each of the probes, and the other end of which is electrically connected to the bottom electrode of the pyrolysis furnace; A current sensor is used to detect the current passing through the furnace leakage detection circuit; A voltage comparison circuit is used to compare the voltage of a specified connection node in the furnace leakage detection circuit with a set threshold voltage, and output a corresponding switching signal based on the comparison result. The furnace leakage detection circuit is used to form an energized circuit when the liquid metal in the pyrolysis furnace comes into contact with any of the probes.

2. The leak detection device for a liquid metal catalytic cracking natural gas hydrogen production equipment as described in claim 1, characterized in that, The furnace leakage detection circuit includes: a power supply, multiple resistors connected in series and at least one inductor; the positive terminal of the power supply is connected in series with the inductor through the multiple resistors, and the other end of the inductor is electrically connected to the probe; the negative terminal of the power supply is electrically connected to the bottom electrode of the pyrolysis furnace.

3. The leak detection device for a liquid metal catalytic cracking natural gas hydrogen production equipment as described in claim 2, characterized in that, The furnace leakage detection circuit further includes a milliammeter; wherein the milliammeter is connected in series between the plurality of series-connected resistors; and the signal terminal of the milliammeter is electrically connected to the current sensor.

4. The leak detection device for a liquid metal catalytic cracking natural gas hydrogen production equipment as described in claim 3, characterized in that, The voltage comparison circuit includes: an operational amplifier, a transistor, a relay, and at least three resistors; In the voltage comparison circuit, at least two resistors are connected in series to form a voltage divider branch for the input voltage, and the voltage divider point is electrically connected to the inverting input terminal of the operational amplifier to provide the threshold voltage; in the furnace leak detection circuit, one connection node of the plurality of series resistors is electrically connected to the non-inverting input terminal of the operational amplifier to provide the voltage of the connection node in the furnace leak detection circuit. The output terminal of the operational amplifier is electrically connected to the base of the transistor through a resistor, and the emitter of the transistor is grounded; the coil input terminal of the relay is connected to the input voltage, and the coil output terminal is electrically connected to the collector of the transistor; the relay is used to generate the switching signal.

5. The leak detection device for a liquid metal catalytic cracking natural gas hydrogen production equipment as described in claim 4, characterized in that, In the furnace leak detection circuit, one of the multiple resistors connected in series is an adjustable resistor; wherein, the adjustment terminal of the adjustable resistor is electrically connected to the non-inverting input terminal of the operational amplifier.

6. The leak detection device for a liquid metal catalytic cracking natural gas hydrogen production equipment as described in claim 5, characterized in that, One end of the voltage divider branch is electrically connected to the positive terminal of the power supply, and the other end is electrically connected to the negative terminal of the power supply; the emitter of the transistor is electrically connected to the negative terminal of the power supply to achieve grounding.

7. The leak detection device for a liquid metal catalytic cracking natural gas hydrogen production equipment as described in claim 6, characterized in that, Also includes: A control module; wherein the control module is electrically connected to the current sensor and the relay respectively, to acquire the current signal collected by the current sensor and the switching signal of the relay.

8. The leak detection device for a liquid metal catalytic cracking natural gas hydrogen production equipment as described in claim 7, characterized in that, The control module has a built-in A / D converter used to convert the current signal collected by the current sensor into corresponding current data.

9. The leak detection device for a liquid metal catalytic cracking natural gas hydrogen production equipment as described in claim 8, characterized in that, The control module is used to determine whether to output a furnace leakage alarm signal and / or a furnace leakage warning signal and / or a shutdown signal based on the current data and the switch signal.

10. The leak detection device for a liquid metal catalytic cracking natural gas hydrogen production equipment as described in any one of claims 1 to 9, characterized in that, The current sensor is a current transformer; several probes are arranged around the furnace wall of the pyrolysis furnace, with the upper end of the probes extending close to the top of the pyrolysis furnace and the lower end of the probes extending close to the bottom electrode of the pyrolysis furnace.

Images