A baseline calibration system and calibration method for an ozone sensor
By inputting ozone-containing gas online and decomposing it in the thermal decomposition chamber, the baseline calibration of the ozone sensor is achieved, solving the problems of inaccurate accuracy of ozone sensors and low start-stop efficiency in the prior art, reducing costs and improving the production line Work efficiency.
Patent Information
- Application Number
- CN202111085102.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-09-16
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2041-09-16
AI Technical Summary
The existing ozone sensors are inaccurate in use and need to shut down the production line for baseline calibration, resulting in high costs and low operating efficiency.
An ozone sensor baseline calibration system is designed, including a first three-way valve, an ozone sensor, an air pump, a second three-way valve, a gas pipe and a thermal decomposition chamber. By inputting ozone-containing gas online and heating and decomposing it in the thermal decomposition chamber, it forms a Standard gas, achieving baseline calibration of ozone sensors.
Without shutting down the production line, the cost is reduced, the operating efficiency of the production line is improved, and the need to disassemble and assemble equipment and equip additional standard gases is avoided.
Smart Images
Figure CN113702434B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of ozone sensor calibration, and in particular to an ozone sensor baseline calibration system and calibration method. Background Art
[0002] In atmospheric environment monitoring and production lines that use air containing ozone (such as air microstations and waste gas treatment production lines), ozone detection equipment such as ozone sensors are usually used to detect the ozone concentration in the air. In the process of using ozone detection equipment such as ozone sensors, as the production line continues to operate, the accuracy of ozone detection equipment such as ozone sensors will be inaccurate. In order to solve the above problem, the production line is usually shut down, and then the ozone detection equipment such as ozone sensors are removed from the production line for baseline calibration and zeroing. When zeroing, standard gas without ozone is also required. After zeroing, the ozone detection equipment such as ozone sensors are installed back on the production line, and then the production line is started and operated.
[0003] The above-mentioned baseline calibration method requires the removal and installation of ozone detection equipment such as ozone sensors, and also requires the preparation of standard gases, which leads to high costs. On the other hand, the start and stop of the production line will also lead to low operating efficiency of the production line. Summary of the invention
[0004] The object of the present invention is to provide an ozone sensor baseline calibration system and calibration method, which can perform baseline calibration on the ozone sensor online without shutting down the production line, thereby reducing costs and improving the operating efficiency of the production line.
[0005] To achieve this object, the present invention adopts the following technical solutions:
[0006] An ozone sensor baseline calibration system comprises a first three-way valve, an ozone sensor, an air pump, a second three-way valve, an air pipe and a thermal decomposition chamber, wherein port A of the first three-way valve is connected to a gas inlet, port B of the first three-way valve is connected to the ozone sensor, the air pump is connected between the ozone sensor and the second three-way valve, port A of the second three-way valve is connected to the ozone sensor, port B of the second three-way valve is connected to a gas outlet, port C of the first three-way valve and port C of the second three-way valve are connected to the air pipe, and the air pipe is partially placed in the thermal decomposition chamber.
[0007] Preferably, the portion of the air pipe located in the thermal decomposition chamber is spiral or wavy.
[0008] Preferably, a heater is provided inside the thermal decomposition chamber.
[0009] Preferably, the heater is a heating layer coated in the thermal decomposition chamber, and the heating layer is a heating resistor.
[0010] Preferably, the outer wall of the thermal decomposition chamber is coated with a thermal insulation layer.
[0011] Preferably, a temperature sensor is provided in the thermal decomposition chamber.
[0012] The present invention also provides a calibration method for the above-mentioned ozone sensor baseline calibration system, comprising the following steps:
[0013] Control the A port and the C port of the first three-way valve to be connected, control the A port and the C port of the second three-way valve to be connected, and input the ozone-containing gas into the air pipe;
[0014] Control the B port and the C port of the first three-way valve to be connected, and control the air pump to circulate the gas in the air pipe;
[0015] Starting a heater of the thermal decomposition chamber to completely decompose the ozone in the gas;
[0016] The baseline of the ozone sensor is calibrated to zero the ozone sensor.
[0017] Preferably, the temperature in the thermal decomposition chamber is detected by a temperature sensor, and the heating temperature of the heater is adjusted to a preset temperature according to the temperature.
[0018] Preferably, after the heater is controlled to operate at the preset temperature for a preset time, the heater is stopped.
[0019] The beneficial effects of the present invention are as follows: when performing a baseline calibration of an ozone sensor, it is only necessary to deliver ozone-containing air into the trachea, then control the B port and the C port of the first three-way valve to be connected, control the A port and the C port of the second three-way valve to be connected, circulate the gas in the trachea through an air pump, and then completely decompose the ozone in the gas through a thermal decomposition chamber to form a standard gas, and then the baseline of the ozone sensor can be calibrated online to return the ozone sensor to zero.
[0020] Through the calibration system and calibration method, the present invention can perform baseline calibration on the ozone sensor online without shutting down the production line. There is no need to disassemble the ozone sensor and equip additional standard gas, which has lower costs and does not require starting and stopping the production line, thereby ensuring the operating efficiency of the production line. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 The diagram is a schematic diagram of the structural principle of the ozone sensor baseline calibration system provided by the present invention.
[0022] In the figure:
[0023] 1. First three-way valve; 2. Ozone sensor; 3. Air pump; 4. Second three-way valve; 5. Air pipe; 6. Thermal decomposition chamber; 61. Heater; 62. Insulation layer; 63. Temperature sensor. DETAILED DESCRIPTION
[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.
[0025] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0026] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0027] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.
[0028] In order to perform baseline calibration on the ozone sensor 2 online without shutting down the production line, the present invention provides an ozone sensor baseline calibration system, such as Figure 1As shown, the ozone sensor baseline calibration system includes a first three-way valve 1, an ozone sensor 2, an air pump 3, a second three-way valve 4, an air pipe 5 and a thermal decomposition chamber 6, wherein: the A port of the first three-way valve 1 is connected to the gas inlet, the B port of the first three-way valve 1 is connected to the ozone sensor 2, the air pump 3 is connected between the ozone sensor 2 and the second three-way valve 4, the A port of the second three-way valve 4 is connected to the ozone sensor 2, the B port of the second three-way valve 4 is connected to the gas outlet, the C port of the first three-way valve 1 and the C port of the second three-way valve 4 are connected to the air pipe 5, and the air pipe 5 is partially placed in the thermal decomposition chamber 6.
[0029] When the baseline calibration of the ozone sensor 2 is not performed, the A port and the B port of the first three-way valve 1 are controlled to be connected, and the A port and the B port of the second three-way valve 4 are controlled to be connected, and the ozone-containing gas can enter the A port of the first three-way valve 1 through the gas inlet, and pass through the first three-way valve 1, the ozone sensor 2, the air pump 3, and the second three-way valve 4 in sequence and then flow out through the gas outlet. In this process, the ozone sensor 2 detects the concentration of ozone in the gas. When the baseline calibration of the ozone sensor 2 is required, the A port and the C port of the first three-way valve 1 are controlled to be connected, and the A port and the C port of the second three-way valve 4 are controlled to be connected, and then the ozone-containing gas is input into the air pipe 5 through the gas inlet, and then the B port and the C port of the first three-way valve 1 are controlled to be connected, and the air pump 3 is controlled to circulate the gas in the air pipe 5. Then the thermal decomposition chamber 6 is controlled to thermally decompose the gas in the air pipe 5 to completely decompose the ozone, and the gas in the air pipe 5 is controlled to circulate multiple times by the air pump 3, so that the ozone can be completely decomposed better. At this time, the baseline of the ozone sensor 2 can be calibrated to make the ozone sensor 2 return to zero.
[0030] In this embodiment, the portion of the air pipe 5 located in the thermal decomposition chamber 6 is spiral-shaped. Through the spiral distribution, the length of the air pipe 5 located in the thermal decomposition chamber 6 can be increased, which increases the time that the ozone-containing gas stays in the thermal decomposition chamber 6, thereby improving the efficiency of thermal decomposition of ozone to ensure that ozone can be completely decomposed under high temperature conditions. In addition, the thermal decomposition chamber 6 of this embodiment directly heats and decomposes ozone without a catalyst, and has the characteristics of high decomposition efficiency and no secondary pollution. It can be understood that the portion of the air pipe 5 located in the thermal decomposition chamber 6 is wavy, and can also be other shapes that can extend the length of the air pipe 5 located in the thermal decomposition chamber 6.
[0031] The above-mentioned thermal decomposition chamber 6 is provided with a heater 61 to heat the thermal decomposition chamber 6, and then heat the gas in the air pipe 5, so as to achieve the purpose of decomposing ozone. Preferably, the heater 61 can be a heating layer coated in the thermal decomposition chamber 6, and the heating layer can be a heating resistor, or other structures that can achieve heating. In addition, the form of being coated in the thermal decomposition chamber 6 can make the heating in the thermal decomposition chamber 6 more uniform, and then the gas in the air pipe 5 is evenly heated, and the ozone decomposition effect is better.
[0032] Furthermore, the outer wall of the thermal decomposition chamber 6 is coated with a heat-insulating layer 62, and the heat-insulating layer 62 prevents the heat in the thermal decomposition chamber 6 from being dissipated, so as to prevent the temperature in the thermal decomposition chamber 6 from failing to meet the ozone decomposition requirement.
[0033] In this embodiment, a temperature sensor 63 is further provided in the thermal decomposition chamber 6, and the temperature sensor 63 is used to detect the temperature in the thermal decomposition chamber 6, and then accurately control the temperature in the thermal decomposition chamber 6 to meet the preset temperature, and the preset temperature meets the requirements of ozone decomposition. It should be noted that the temperature in the thermal decomposition chamber 6 is detected by the temperature sensor 63. When the temperature is lower than the preset temperature, the heater 61 can be controlled to increase the heating temperature, and when the temperature is higher than the preset temperature, the heater 61 can be controlled to reduce the heating temperature. The above-mentioned preset temperature can be a specific value or a range value.
[0034] It should be noted that, since the air pipe 5 in the thermal decomposition chamber 6 is spiral or wavy, the volume of the thermal decomposition chamber 6 of this embodiment can be smaller, and thus it is easier to integrate into the equipment of the production line.
[0035] The above-mentioned ozone sensor baseline calibration system of this embodiment, when performing the baseline calibration of the ozone sensor 2, only needs to deliver ozone-containing air into the air pipe 5, then control the B port and the C port of the first three-way valve 1 to be connected, control the A port and the C port of the second three-way valve 4 to be connected, and make the gas in the air pipe 5 circulate through the air pump 3, and then completely decompose the ozone in the gas through the thermal decomposition chamber 6 to form a standard gas, and then the baseline of the ozone sensor 2 can be calibrated online to return the ozone sensor 2 to zero. Through the above-mentioned calibration system and calibration method, the baseline calibration of the ozone sensor 2 can be performed online without shutting down the production line, without disassembling the ozone sensor 2 and equipping additional standard gas, which is lower in cost and does not require starting and stopping the production line, thereby ensuring the operating efficiency of the production line.
[0036] The present invention also provides a calibration method for the above-mentioned ozone sensor baseline calibration system, comprising the following steps:
[0037] S1, controlling the A port and the C port of the first three-way valve 1 to be connected, controlling the A port and the C port of the second three-way valve 4 to be connected, and inputting the ozone-containing gas into the air pipe 5.
[0038] That is to say, when performing baseline calibration, ozone-containing gas is input into the gas pipe 5 .
[0039] S2, controlling the B port and the C port of the first three-way valve 1 to be connected, and controlling the air pump 3 to circulate the gas in the air pipe 5.
[0040] S3. Start the heater 61 of the thermal decomposition chamber 6 to completely decompose the ozone in the gas.
[0041] In this step, after the heater 61 is controlled to operate at a preset temperature for a preset time, the heater 61 is stopped. By setting the preset time, it can be ensured that the ozone in the gas can be completely decomposed.
[0042] S4. Calibrate the baseline of the ozone sensor 2 to return the ozone sensor 2 to zero.
[0043] After the baseline calibration of the ozone sensor 2 is completed, the A port and the B port of the first three-way valve 1 are controlled to be connected, and the A port and the B port of the second three-way valve 4 are controlled to be connected. At this time, the ozone-containing gas can pass through the first three-way valve 1, the ozone sensor 2, the air pump 3, and the second three-way valve 4 in sequence and then flow out through the gas outlet. At this time, the ozone sensor 2 detects the ozone concentration in the gas in real time.
[0044] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.
Claims
1. An ozone sensor baseline calibration system, characterized in that: The invention comprises a first three-way valve (1), an ozone sensor (2), an air pump (3), a second three-way valve (4), an air pipe (5) and a thermal decomposition chamber (6), wherein the port A of the first three-way valve (1) is connected to a gas inlet, the port B of the first three-way valve (1) is connected to the ozone sensor (2), the air pump (3) is connected between the ozone sensor (2) and the second three-way valve (4), the port A of the second three-way valve (4) is connected to the ozone sensor (2), the port B of the second three-way valve (4) is connected to a gas outlet, the port C of the first three-way valve (1) and the port C of the second three-way valve (4) are connected to the air pipe (5), and a part of the air pipe (5) is placed in the thermal decomposition chamber (6); By means of the calibration system, the ozone sensor (2) can be baseline calibrated online without shutting down the production line, and there is no need to disassemble the ozone sensor (2) or equip it with additional standard gas.
2. The ozone sensor baseline calibration system according to claim 1, characterized in that: The portion of the air pipe (5) located in the thermal decomposition chamber (6) is spiral or wavy.
3. The ozone sensor baseline calibration system according to claim 1 or 2, characterized in that: A heater (61) is provided inside the thermal decomposition chamber (6).
4. The ozone sensor baseline calibration system according to claim 3, characterized in that: The heater (61) is a heating layer encapsulated in the thermal decomposition chamber (6), and the heating layer is a heating resistor.
5. The ozone sensor baseline calibration system according to claim 1 or 2, characterized in that: The outer wall of the thermal decomposition chamber (6) is coated with a thermal insulation layer (62).
6. The ozone sensor baseline calibration system according to claim 1 or 2, characterized in that: A temperature sensor (63) is provided in the thermal decomposition chamber (6).
7. A method for calibrating an ozone sensor baseline calibration system according to any one of claims 1 to 6, characterized in that: The following steps are involved: Controlling the communication between port A and port C of the first three-way valve (1), controlling the communication between port A and port C of the second three-way valve (4), and inputting ozone-containing gas into the air pipe (5); Controlling the B port and the C port of the first three-way valve (1) to communicate with each other, and controlling the air pump (3) to circulate the gas in the air pipe (5); Starting the heater (61) of the thermal decomposition chamber (6) to completely decompose the ozone in the gas; The baseline of the ozone sensor (2) is calibrated to zero the ozone sensor (2).
8. The calibration method according to claim 7, characterized in that: The temperature in the thermal decomposition chamber (6) is detected by a temperature sensor (63), and the heating temperature of the heater (61) is adjusted to a preset temperature according to the temperature.
9. The calibration method according to claim 8, characterized in that: After controlling the heater (61) to operate at the preset temperature for a preset time, the heater (61) is stopped.