Gas deodorizing device

Abstract

The present invention relates to the field of nanosecond high-voltage power supply technology, and specifically to a gas deodorization device. Specifically, it includes an industrial frequency AC power supply, an AC-DC converter, two AC-DC converter control circuits, a controller, three acquisition circuits, a plasma generator, a magnetic switch cooperative protection circuit, a pulse energy storage circuit, a discharge circuit, a pulse generation and boost circuit, and a semiconductor switch control circuit. The present invention can adjust electrical parameters through program software and is suitable for removing gas odors and peculiar smells in different industries and working conditions; the controllable pulse high-voltage low-temperature plasma technology adopts a discontinuous pulse power supply method, which is not easy to break down, form spark discharges, and draw arcs; and the pulse high voltage method is adopted, and the plasma pulse peak voltage is far away from the pulse peak voltage of the generator electric field breakdown point, which is easy to control, and produces a stable and wide low-temperature plasma working range, and the deodorization effect is stable.

Description

Technical Field

[0001] The present invention relates to the technical field of nanosecond-level high-voltage power supplies, and in particular to a gas deodorizing device. Background Art

[0002] Common methods for treating malodorous gases include biological decomposition, activated carbon adsorption, plasma deodorization, spray liquid deodorization and photocatalytic oxidation.

[0003] Low-temperature plasma is an efficient, clean, and convenient deodorization and purification process. Its principle for treating pollutants is as follows: Under the influence of an external electric field, a large number of high-energy particles generated by air-gap discharges bombard pollutant molecules, ionizing, dissociating, and exciting them. This triggers a series of complex physical and chemical reactions, transforming complex macromolecular pollutants into simple, small, and safe substances, and converting toxic and harmful substances into non-toxic or low-toxic substances, thereby degrading and removing pollutants. In light of this, a device for gas deodorization using low-temperature plasma is proposed. Summary of the Invention

[0004] The object of the present invention is to provide a gas deodorizing device to solve the existing problems in the above-mentioned background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a gas deodorization device, comprising an industrial frequency AC power supply, an AC-DC converter, two AC-DC converter control circuits, a controller, three acquisition circuits, a plasma generator, a magnetic switch cooperative protection circuit, a pulse energy storage circuit, a discharge circuit, a pulse generation and boosting circuit, and a semiconductor switch control circuit;

[0006] The industrial frequency AC power supply is respectively connected to the AC-DC converter and the magnetic switch cooperative protection circuit to provide industrial frequency AC power thereto;

[0007] One of the AC / DC converter control circuits is connected between the AC / DC converter and the controller, and is used to adjust the output DC voltage VDC1 of the AC / DC converter according to the signal of the controller; the other AC / DC converter control circuit is connected between the magnetic switch cooperative protection circuit and the controller, and is used to adjust the voltage of the magnetic switch cooperative protection circuit according to the signal of the controller;

[0008] One acquisition circuit is connected between the AC / DC converter and the controller, and is used to acquire the output voltage of the AC / DC converter and send it to the controller; a second acquisition circuit is connected between the plasma generator and the controller, and is used to acquire the output current of the plasma generator and send it to the controller; a third acquisition circuit is connected between the discharge circuit and the controller, and is used to acquire the output current of the discharge circuit and send it to the controller;

[0009] The magnetic switch cooperative protection circuit is used to ensure the consistency of each magnetic switch action, ensure the same electrical parameters have the same peak voltage, and limit the reverse current;

[0010] The pulse energy storage circuit is used to quickly charge the plasma generator, so that the voltage between its internal electrodes rises rapidly, forming a high-voltage electric field, thereby removing odors and peculiar smells in the gas;

[0011] The discharge circuit is used to reduce the voltage on the capacitor in the plasma generator to zero, thereby preventing the pulse high-voltage circuit from oscillating and the plasma generator from being broken down;

[0012] The pulse generating and boosting circuit is used to convert direct current into high voltage pulses;

[0013] The semiconductor switch control circuit is connected between the pulse generating and boosting circuit and the controller, and is used to adjust the pulse voltage frequency of the pulse generating and boosting circuit according to the signal of the controller, thereby controlling the number of times of removing odor and bad smell from the gas.

[0014] Preferably, the magnetic switch cooperative protection circuit includes a cooperative protection circuit, a magnetic switch LV1 and a magnetic switch LV2. The cooperative protection circuit includes an AC-DC converter MT2, which is used to convert the industrial frequency AC power supply and output DC power VDC2; the positive pole of DC power VDC2 passes through a diode D21, a resistor R21, an inductor L21, the primary coil PC2 of the magnetic switch LV2, and the primary coil PC1 of the magnetic switch LV1, and returns to the negative pole of DC power VDC2.

[0015] Preferably, the collaborative protection circuit further includes a diode D22 and a capacitor C21. The diode D22 is used to protect the direct current VDC2; the capacitor C21 is used to absorb the reverse current when the secondary coil SC2 of the magnetic switch LV2 and the secondary coil SC1 of the magnetic switch LV1 are working.

[0016] Preferably, the pulse energy storage circuit includes a capacitor C4 and the magnetic switch LV1.

[0017] Preferably, the discharge circuit includes a resistor R2 and the magnetic switch LV2.

[0018] Preferably, the pulse generation and boosting circuit includes a current limiting inductor L1, an inductor L2, a diode D1, energy storage capacitors C2-C4, a pulse transformer TR1, power semiconductor switches VT1 and VT2. The positive electrode of the direct current VDC1 passes through the current limiting inductor L1 and the diode D1 to charge the energy storage capacitor C3, and then returns to the negative electrode of VDC1 through the inductor L2 and the primary coil of the pulse transformer TR1. After the energy storage capacitor C3 is charged, the power semiconductor switch VT1 can be controlled to turn on. After turning on, the primary coil of the pulse transformer TR1 inputs a low-voltage pulse, the secondary coil of the pulse transformer TR1 boosts the voltage and outputs a high-voltage pulse. The secondary coil of the pulse transformer TR1 charges the energy storage capacitor C4. The power semiconductor switch VT2 and the energy storage capacitor C2 are used to limit the peak voltage of the power semiconductor switch VT1 to prevent breakdown.

[0019] Preferably, the input end of the plasma generator is further connected to an air inlet, and an inlet sensor is provided at the air inlet for monitoring parameters of the inlet gas and sending the parameters to the controller.

[0020] Preferably, the outlet end of the plasma generator is further connected to an air outlet, and an outlet gas sensor is provided at the air outlet for monitoring the parameters of the outlet gas and sending them to the controller.

[0021] Preferably, an air dust filter is also provided at the air outlet.

[0022] Preferably, the mechanical structure of the plasma generator is a plate-wire structure, a wire-bore structure or a needle-plate structure.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The treatment process is simple and easy to operate and maintain. It uses electric energy-controllable pulse high voltage to directly generate low-temperature plasma in the odorous gas to remove the odor;

[0025] (2) The electrical parameters can be adjusted through the program software, which is suitable for removing gas odors in different industries and working conditions;

[0026] (3) Controllable pulse high-voltage low-temperature plasma technology adopts a discontinuous pulse power supply method, which is not easy to break down, form spark discharge, and arc; and the pulse high voltage method is used. The plasma pulse peak voltage is far away from the pulse peak voltage of the generator electric field breakdown point, which is easy to control, and produces a stable and wide low-temperature plasma working range, and the deodorization effect is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a system diagram of a gas deodorization device according to the present invention;

[0028] Figure 2This is a circuit diagram of a gas deodorizing device according to the present invention;

[0029] Figure 3 for Figure 1 The circuit schematic diagram of K1-K3;

[0030] Figure 4 for Figure 2 The circuit schematic diagram of Q1-Q4;

[0031] Figure 5 is the equivalent circuit diagram of the plasma generator FZ1;

[0032] Figure 6 for Figure 2 Voltage waveform of medium plasma generator FZ1 at millimeter level;

[0033] Figure 7 for Figure 2 The voltage waveform of capacitor C4 at the nanosecond level;

[0034] Figure 8 for Figure 2 The voltage waveform of the plasma generator FZ1 at the nanosecond level. DETAILED DESCRIPTION

[0035] 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 described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] See also Figure 1-2 The present invention provides a technical solution, specifically as follows Figure 1 A gas deodorization device shown includes an industrial frequency AC power supply Vabc, an AC-DC converter MT1, two AC-DC converter control circuits, a controller MT2, three acquisition circuits, a plasma generator FZ1, a magnetic switch cooperative protection circuit, a pulse energy storage circuit, a discharge circuit, a pulse generation and boosting circuit, and a semiconductor switch control circuit;

[0037] The industrial frequency AC power source Vabc is connected to the AC / DC converter MT1 and the magnetic switch cooperative protection circuit respectively, so as to provide them with industrial frequency AC power;

[0038] One AC-DC converter control circuit Q1 is connected between the AC-DC converter MT1 and the controller MT2, and is used to adjust the output DC voltage VDC1 of the AC-DC converter MT1 according to the signal of the controller MT2; the other AC-DC converter control circuit Q4 is connected between the magnetic switch cooperative protection circuit and the controller MT2, and is used to adjust the voltage of the magnetic switch cooperative protection circuit according to the signal of the controller MT2;

[0039] The three acquisition circuits are the DC voltage acquisition circuit K1, the plasma generator FZ1 current acquisition circuit K2, and the discharge current acquisition circuit K3. K1 is connected between the AC / DC converter MT1 and the controller MT2, collecting the output voltage of the AC / DC converter MT1 and transmitting it to the controller MT2. K2 is connected between the plasma generator FZ1 and the controller MT2, collecting the output current of the plasma generator FZ1 and transmitting it to the controller MT2. K3 is connected between the discharge circuit and the controller MT2, collecting the output current of the discharge circuit and transmitting it to the controller MT2. The controller MT2 uses the plasma generator FZ1 current acquisition circuit K2 and the discharge current acquisition circuit K3 to accurately identify pulsed high-voltage breakdown in the plasma generator FZ1. When a pulsed high-voltage pulse is applied to the plasma generator, a charging current flows. After a period of time, the residual charge on the distributed capacitors of the plasma generator FZ1 is released by the discharge circuit, resulting in a discharge current. If a high-voltage breakdown occurs within the plasma generator FZ1, and the distributed capacitors are free of residual charge, there will be no discharge current. Therefore, there is charging current but no discharging current, which can realize the accurate identification function of the plasma generator FZ1 pulse high voltage breakdown.

[0040] The magnetic switch cooperative protection circuit is used to ensure the consistency of each magnetic switch action, ensure the same electrical parameters have the same peak voltage, and limit the reverse current;

[0041] The pulse energy storage circuit is used to quickly charge the plasma generator FZ1, causing the voltage between its internal electrodes to rise rapidly, forming a high-voltage electric field, thereby removing odors and bad smells from the gas;

[0042] The discharge circuit is used to reduce the voltage on the capacitor in the plasma generator FZ1 to zero, to prevent the pulse high voltage circuit from oscillating and to avoid the breakdown of the plasma generator FZ1;

[0043] Pulse generation and boost circuits are used to convert direct current into high voltage pulses;

[0044] The semiconductor switch control circuit is connected between the pulse generating and boosting circuit and the controller MT2, and is used to adjust the pulse voltage frequency of the pulse generating and boosting circuit according to the signal of the controller MT2, thereby controlling the number of times of removing odor and bad smell from the gas.

[0045] like Figure 2 As shown, the magnetic switch cooperative protection circuit includes a cooperative protection circuit, a magnetic switch LV1 and a magnetic switch LV2. The cooperative protection circuit includes an AC-DC converter MT2, which is used to convert the industrial frequency AC power supply Vabc and output DC power VDC2; the positive electrode of DC power VDC2 passes through a diode D21, a resistor R21, an inductor L21, the primary coil PC2 of the magnetic switch LV2, and the primary coil PC1 of the magnetic switch LV1, and returns to the negative electrode of DC power VDC2.

[0046] like Figure 2 As shown, the cooperative protection circuit further includes a diode D22 and a capacitor C21. The diode D22 is used to protect the direct current VDC2; the capacitor C21 is used to absorb the reverse current when the secondary coil SC2 of the magnetic switch LV2 and the secondary coil SC1 of the magnetic switch LV1 are working.

[0047] like Figure 2 As shown, the pulse energy storage circuit includes capacitor C4 and magnetic switch LV1. The energy storage capacitor C4 and magnetic switch LV1 form a pulse compression circuit, which can be composed of multiple stages. Only one stage of compression is shown in the figure.

[0048] like Figure 2 As shown, the discharge circuit includes a resistor R2 and a magnetic switch LV2.

[0049] like Figure 2 As shown, the pulse generation and boost circuit includes a current-limiting inductor L1, an inductor L2, a diode D1, energy storage capacitors C2-C4, a pulse transformer TR1, and power semiconductor switches VT1 and VT2. The positive terminal of DC power VDC1 passes through the current-limiting inductor L1 and diode D1 to charge energy storage capacitor C3. The DC power then flows through inductor L2 and the primary coil of pulse transformer TR1 back to the negative terminal of VDC1. Once energy storage capacitor C3 is charged, it controls the conduction of power semiconductor switch VT1. After conduction, the primary coil of pulse transformer TR1 inputs a low-voltage pulse, which boosts the secondary coil of pulse transformer TR1 and outputs a high-voltage pulse. The secondary coil of pulse transformer TR1 charges energy storage capacitor C4. The power semiconductor switch VT2 and energy storage capacitor C2 limit the peak voltage of power semiconductor switch VT1 to prevent breakdown. The semiconductor switch control circuit includes Q2 and Q3, with Q2 connected to power semiconductor switch VT1 and Q3 connected to power semiconductor switch VT2. Controller MT2, through semiconductor switch control circuit Q2, controls the conduction of power semiconductor switch VT1, controlling the frequency of the generated pulse voltage and the number of times the gas is deodorized. Controller MT2 also controls the peak voltage within plasma generator FZ1 and the intensity of the low-temperature plasma by varying the DC voltage VDC1 through AC / DC converter control circuit Q1.

[0050] like Figure 2As shown, the input end of the plasma generator FZ1 is also connected to the air inlet P1, and the air inlet P1 is provided with an induced draft fan F1 and an inlet sensor S1. F1 is used to transmit the wind at the air inlet P1 into FZ1, and S1 is used to monitor the parameters of the inlet gas and send them to the controller MT2.

[0051] like Figure 2 As shown, the outlet end of the plasma generator FZ1 is also connected to an air outlet P2, and an outlet gas sensor S2 is provided at the air outlet P2 for monitoring the parameters of the outlet gas and sending them to the controller MT2.

[0052] like Figure 2 As shown, an air dust filter F2 is also provided at the air outlet P2.

[0053] Specific working principle: (such as Figure 2 After receiving industrial frequency AC power source Vabc, the device undergoes conversion via AC / DC converter MT1, outputting DC voltage VDC1. C1 serves as the DC filter capacitor. DC voltage VDC1 flows through current-limiting inductor L1 and diode D1, charging energy storage capacitor C3. This DC voltage then flows through inductor L2 (which can be the transformer leakage inductance) and the primary winding of pulse transformer TR1, returning to VDC1. Diode D1 prevents continuous oscillation between filter capacitor C1, current-limiting inductor L1, energy storage capacitor C3, inductor L2 (which can be the transformer leakage inductance), and the primary winding of pulse transformer TR1. This would cause the voltage of VDC1 to become unstable, leading to unstable peak voltages in the pulse output.

[0054] The positive terminal of DC power VDC2 flows through diode D21, resistor R21 (which can be the internal resistance of inductor L21), inductor L21, the primary winding PC2 of magnetic switch LV2, and the primary winding PC1 of magnetic switch LV1, returning to the negative terminal of DC power VDC2. This circuit primarily resets magnetic switches LV2 and LV1 to their reverse saturation state, ensuring consistent switching operation and the same peak voltage for identical electrical parameters. Furthermore, resetting to the reverse state significantly increases the magnetic utilization of the magnetic switches, reducing manufacturing costs.

[0055] Inductor L21 primarily withstands reverse voltage during operation of the secondary windings SC2 and SC1 of magnetic switch LV2 and LV1, limiting reverse current. C21 primarily absorbs reverse current during operation of the secondary windings SC2 and SC1 of magnetic switch LV2 and LV1. Diodes D21 and D22 protect DC voltage VDC2.

[0056] Energy storage capacitor C3, inductor L2 (L2 can be the transformer leakage inductance), pulse transformer primary coil, and power semiconductor switch VT1 form a pulse discharge circuit. After energy storage capacitor C3 is charged, it controls power semiconductor switch VT1 to conduct (typically for less than 50 microseconds). This conduction causes low-voltage pulses to be input to the primary coil of pulse transformer TR1, which then steps up the voltage of its secondary coil, producing high-voltage pulses. The secondary coil of pulse transformer TR1 charges energy storage capacitor C4. While energy storage capacitor C4 is charging, magnetic switch LV1 is not saturated, effectively disconnecting plasma generator FZ1 from capacitor C4. After energy storage capacitor C4 charges for a period of time and reaches a certain voltage, magnetic switch LV1 saturates. Energy storage capacitor C4 is then connected to plasma generator FZ1 through magnetic switch LV1. At this point, magnetic switch LV1 is saturated, and its saturation inductance and internal resistance are very small. Plasma generator FZ1 is rapidly charged (typically with a rise time of less than 1 microsecond). The voltage between the electrodes within FZ1 rises rapidly, creating a high-voltage electric field that rapidly ionizes the odor-laden gas flowing through plasma generator FZ1. This generates a large number of positive and negative ions, forming a high-intensity, low-temperature plasma. The plasma reacts with odor molecules in the gas, removing the odor. During this phase, magnetic switch LV2 is either saturated or unsaturated. After the high-voltage electric field persists within plasma generator FZ1 for a period of time (typically less than 10 microseconds), a discharge circuit connected in parallel with FZ1 activates to prevent internal breakdown. Magnetic switch LV2 saturates, rapidly discharging through resistor R2, and the voltage across FZ1 drops to zero. At this point, the pulse plasma treatment for removing odors from the gas is complete. The controller MT2 can control the conduction of the power semiconductor switch VT1 at a fixed frequency through the semiconductor switch control circuit Q2, controlling the frequency of the generated pulse voltage and the number of times the odor is removed from the gas. The controller MT2 can control the pulse frequency output based on the odorous gas inlet sensor S1 (which can be an inlet gas flowmeter, variable frequency fan frequency, temperature, humidity, etc.) or the outlet gas sensor S2 (which can be an inlet gas flowmeter, outlet odor sensor, ozone sensor, etc.), automatically controlling the number of times the odor is removed from the gas, optimizing operating energy consumption and the treatment effect. The controller MT2 can also change the voltage value of the DC voltage VDC1 through the AC / DC converter control circuit Q1, controlling the peak voltage inside the plasma generator FZ1 and controlling the intensity of the low-temperature plasma, making it suitable for gas odor removal in different industries and working conditions. The DC voltage acquisition circuit K1, the plasma generator FZ1 current acquisition circuit K2, and the discharge current acquisition circuit K3 are connected to the controller MT2 to monitor the status of the pulse generating circuit and the plasma generator FZ1, and realize automatic control, fault protection and other functions.

[0057] Power semiconductor switches VT1 and VT2 are part of the same IGBT module. The lower half-bridge of the IGBT module is semiconductor switch VT1, serving as a pulse control switch. The upper half-bridge of the IGBT module is semiconductor switch VT2. Semiconductor switch VT2 and capacitor C2 protect semiconductor switch VT1, limiting its peak voltage and preventing it from breaking down. VT1 and VT2 are packaged within the same IGBT module and directly connected internally, minimizing the distributed inductance of the protective circuit's center conductor and maximizing voltage spike protection.

[0058] Among them, K1-K3 is a photoelectric isolation conversion circuit, which isolates and converts the sensor signal and sends it to the controller MT2 to improve the anti-interference ability. The specific circuit schematic is as follows Figure 3 As shown; Q1-Q4 is a drive control circuit with photoelectric isolation, the specific circuit schematic is as follows Figure 4 shown.

[0059] like Figure 5 As shown in the figure, it is the equivalent circuit of the plasma generator FZ1: the mechanical structure of FZ1 generates a large distributed capacitance C31. The high-voltage pulse first charges C31. When the voltage of C31 is greater than the minimum voltage value for generating ions, that is, greater than the voltage value of the Zener diode Z31, plasma begins to be generated. When the voltage of C31 continues to rise, the variable resistor R31 decreases rapidly, releasing a large number of positive and negative ions, generating high-intensity plasma. After a period of time, the distributed capacitance C31 has a residual voltage close to that of the Zener diode Z31. This voltage will cause oscillation and breakdown.

[0060] Furthermore, the main mechanical structure of plasma generator FZ1 can be a plate-wire structure, a bobbin structure, or a needle-plate structure, used to create a non-uniform electric field and generate plasma using pulsed high voltage. FZ1's mechanical structure produces a large distributed capacitance. After the high-voltage electric field persists within plasma generator FZ1 for a period of time, a large amount of charge remains in the distributed capacitance of plasma generator FZ1, forming a residual high voltage. This residual high voltage in the distributed capacitance of plasma generator FZ1 will repeatedly oscillate with magnetic switch LV1 and energy storage capacitor C4, resulting in unstable switching voltage and abnormal peak output during each saturation operation of magnetic switch LV1. Furthermore, if this residual high voltage persists for a period of time, it can also cause high-voltage breakdown within ion generator FZ1.

[0061] To prevent residual voltage oscillation and breakdown on the distributed capacitors within plasma generator FZ1, the high-voltage electric field persists within plasma generator FZ1 for a period of time (typically less than 10 μs). The discharge circuit connected in parallel with plasma generator FZ1 (magnetic switch LV2, secondary coil SC2, and resistor R2) begins operating. Magnetic switch LV2 saturates, rapidly discharging through resistor R2, and the voltage on the distributed capacitors within plasma generator FZ1 drops to zero. This completes the pulsed plasma process for removing odors from the gas.

[0062] like Figure 6 The voltage waveform of the plasma generator FZ1 at the millimeter level is shown, wherein the controller MT2 changes the voltage value of the DC voltage VDC1 through the AC-DC converter control circuit Q1 to control the peak voltage VC2Peak inside the plasma generator FZ1 and control the intensity of the low-temperature plasma.

[0063] TS is the repetitive interval of the high-voltage pulses. By adjusting the operating frequency, controller MT2, through semiconductor switch control circuit Q2, controls the conduction of power semiconductor switch VT1, the frequency of the generated pulse voltage, and the number of times the gas is deodorized. When there is no pulse output, the positive terminal of DC power VDC2 flows through diode D21, resistor R21 (which can be the internal resistance of inductor L21), inductor L21, the primary winding PC2 of magnetic switch LV2, and the primary winding PC1 of magnetic switch LV1, returning to the negative terminal of DC power VDC2. This function primarily resets magnetic switches LV2 and LV1 to a reverse saturation state, ensuring consistent switching operation and the same peak voltage for identical electrical parameters. Furthermore, resetting to the reverse state significantly increases the magnetic utilization of the magnetic switches, reducing manufacturing costs.

[0064] like Figure 7 The voltage waveform of capacitor C4 at the nanosecond level is shown, where ΔT1 is the rising edge time of VC1 voltage, which is generally less than 50us.

[0065] like Figure 8 The voltage waveform of plasma generator FZ1 at the nanosecond level is shown. ΔT2 is the rise time of the VC2 voltage, typically less than 1µs. PW is the pulse width, controlled by the discharge circuit connected in parallel to plasma generator FZ1 (magnetic switch LV2, secondary coil SC2, and resistor R2). Magnetic switch LV2 saturates, rapidly discharging through resistor R2, causing the voltage across the distributed capacitance of plasma generator FZ1 to drop to zero. This prevents residual voltage on the distributed capacitance within plasma generator FZ1 from causing oscillation in the pulsed high-voltage circuit and potentially causing breakdown of plasma generator FZ1.

[0066] The gas deodorizing device of this invention directly converts industrial frequency input power into controllable pulsed high voltage electricity, which is then used to form a high-voltage electric field in a plasma generator. When odorous gas flows through the plasma generator, the high-voltage electric field directly generates a low-temperature plasma within the odorous gas. The plasma reacts with odorous molecules in the gas, removing the odor.

[0067] Advantage 1: The treatment process is simple, and the operation and maintenance are convenient. It uses electric energy - controllable pulse high voltage to directly generate low-temperature plasma in the odorous gas to remove the odor.

[0068] Compared with other treatment processes, such as biological decomposition, activated carbon adsorption, and spray liquid deodorization, it only consumes electricity during operation and does not require the replenishment of chemical raw materials, biological bacteria, liquid reagents, etc.

[0069] Advantage 2: The electrical parameters can be adjusted through the program software, which is suitable for removing gas odors and peculiar smells in different industries and working conditions.

[0070] Compared with other treatment processes, such as biological decomposition, activated carbon adsorption, and spray liquid deodorization, different chemical raw material formulas, different biological bacteria, and different liquid reagents are required according to different odor molecules. This low-temperature plasma deodorization solution is effective for various odor molecules. The electrical parameters are adjusted through program software to change the intensity and frequency of low-temperature plasma.

[0071] Advantage 3: High reliability and continuous and stable effect - controllable pulse high-voltage and low-temperature plasma technology

[0072] Compared with: DC low-temperature plasma technology, which uses DC continuous power supply and DC high voltage to generate low-temperature plasma, the plasma DC high voltage is very close to the DC high voltage at the breakdown point of the generator's electric field, which is not easy to control. The electric field can easily break down, forming spark discharge and arcing; at the same time, the DC high voltage value at the breakdown point of the electric field is easily affected by the gas composition, humidity, temperature, etc. in the odor, resulting in unstable low-temperature plasma and unstable deodorization effect.

[0073] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0074] The relevant modules involved in this system are all hardware system modules or functional modules that combine computer software programs or protocols with hardware in the existing technology. The computer software programs or protocols involved in the functional modules are themselves technologies that are well known to those skilled in the art and are not improvements to this system. The improvements to this system are the interaction or connection relationships between the modules, that is, improvements to the overall structure of the system to solve the corresponding technical problems to be solved by this system.

[0075] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A gas deodorizing device, characterized in that: It includes industrial frequency AC power supply, AC-DC converter, two AC-DC converter control circuits, controller, three acquisition circuits, plasma generator, magnetic switch cooperative protection circuit, pulse energy storage circuit, discharge circuit, pulse generation and boost circuit and semiconductor switch control circuit; The industrial frequency AC power supply is respectively connected to the AC-DC converter and the magnetic switch cooperative protection circuit to provide industrial frequency AC power thereto; One of the AC / DC converter control circuits is connected between the AC / DC converter and the controller, and is used to adjust the output DC voltage VDC1 of the AC / DC converter according to the signal of the controller; the other AC / DC converter control circuit is connected between the magnetic switch cooperative protection circuit and the controller, and is used to adjust the voltage of the magnetic switch cooperative protection circuit according to the signal of the controller; One acquisition circuit is connected between the AC / DC converter and the controller, and is used to acquire the output voltage of the AC / DC converter and send it to the controller; a second acquisition circuit is connected between the plasma generator and the controller, and is used to acquire the output current of the plasma generator and send it to the controller; a third acquisition circuit is connected between the discharge circuit and the controller, and is used to acquire the output current of the discharge circuit and send it to the controller; The magnetic switch cooperative protection circuit is used to ensure the consistency of each magnetic switch action, ensure the same electrical parameters have the same peak voltage, and limit the reverse current; The pulse energy storage circuit is used to quickly charge the plasma generator, so that the voltage between its internal electrodes rises rapidly, forming a high-voltage electric field, thereby removing odors and peculiar smells in the gas; The discharge circuit is used to reduce the voltage on the capacitor in the plasma generator to zero, thereby preventing the pulse high-voltage circuit from oscillating and the plasma generator from being broken down; The pulse generating and boosting circuit is used to convert direct current into high voltage pulses; The semiconductor switch control circuit is connected between the pulse generating and boosting circuit and the controller, and is used to adjust the pulse voltage frequency of the pulse generating and boosting circuit according to the signal of the controller, thereby controlling the number of times of removing odor and peculiar smell from the gas; the output end of the plasma generator is also connected to an air outlet, and an air dust filter is also provided at the air outlet.

2. A gas deodorizing device according to claim 1, characterized in that: The magnetic switch cooperative protection circuit includes a cooperative protection circuit, a magnetic switch LV1 and a magnetic switch LV2. The cooperative protection circuit includes an AC-DC converter MT2, which is used to convert the industrial frequency AC power supply and output DC power VDC2; the positive electrode of DC power VDC2 is returned to the negative electrode of DC power VDC2 through a diode D21, a resistor R21, an inductor L21, the primary coil PC2 of magnetic switch LV2, and the primary coil PC1 of magnetic switch LV1.

3. A gas deodorizing device according to claim 2, characterized in that: The cooperative protection circuit further includes a diode D22 and a capacitor C21. The diode D22 is used to protect the direct current VDC2. The capacitor C21 is used to absorb the reverse current when the secondary coil SC2 of the magnetic switch LV2 and the secondary coil SC1 of the magnetic switch LV1 are working.

4. A gas deodorizing device according to claim 2, characterized in that: The pulse energy storage circuit includes a capacitor C4 and the magnetic switch LV1.

5. A gas deodorizing device according to claim 2, characterized in that: The discharge circuit includes a resistor R2 and the magnetic switch LV2.

6. A gas deodorizing device according to claim 1, characterized in that: The pulse generation and boosting circuit includes a current limiting inductor L1, an inductor L2, a diode D1, energy storage capacitors C2-C4, a pulse transformer TR1, and power semiconductor switches VT1 and VT2. The positive electrode of the direct current VDC1 passes through the current limiting inductor L1 and the diode D1 to charge the energy storage capacitor C3, and then returns to the negative electrode of VDC1 through the inductor L2 and the primary coil of the pulse transformer TR1. After the energy storage capacitor C3 is charged, the power semiconductor switch VT1 is controlled to be turned on. After being turned on, the primary coil of the pulse transformer TR1 inputs a low-voltage pulse, the secondary coil of the pulse transformer TR1 boosts the voltage and outputs a high-voltage pulse. The secondary coil of the pulse transformer TR1 charges the energy storage capacitor C4. The power semiconductor switch VT2 and the energy storage capacitor C2 are used to limit the peak voltage of the power semiconductor switch VT1 to prevent breakdown.

7. A gas deodorizing device according to claim 1, characterized in that: The input end of the plasma generator is also connected to an air inlet, and an inlet sensor is provided at the air inlet for monitoring the parameters of the inlet gas and sending the parameters to the controller.

8. A gas deodorizing device according to claim 1, characterized in that: An outlet gas sensor is provided at the air outlet to monitor the parameters of the outlet gas and send the parameters to the controller.

9. A gas deodorizing device according to any one of claims 1 to 8, characterized in that: The mechanical structure of the plasma generator is a plate-wire structure, a wire-spool structure or a needle-plate structure.

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