Sample gas constant humidity device and sample gas constant humidity method

Abstract

The present application belongs to the field of environmental detection, and particularly relates to a sample gas constant humidity device and a sample gas constant humidity method, which comprises a water storage tank and a condensing device; the water storage tank is provided with a first air inlet and a first air outlet; the condensing device is provided with a second air inlet and a second air outlet; the first air outlet and the second air inlet are connected through an air pipe; the second air outlet is provided with an air outlet pipe; an opening is arranged on the side wall of the air outlet pipe; a sub-pipe is embedded in the air outlet pipe; the sub-pipe is provided with an adapter; and the adapter extends out of the air outlet pipe from the opening. The present application adopts a water circulation design, thereby avoiding the problem of frequent replacement of parts. By adopting a PLC control unit, the condensing device, a temperature sensor, a humidity sensor and the sub-pipe form a closed closed loop with negative feedback adjustment, so that the sample gas can be kept in a constant humidity state. Air is used as the gas source, thereby avoiding the use of fixed dry gas source and reducing the cost.

Description

Technical Field

[0001] This invention belongs to the field of environmental monitoring, specifically relating to a sample gas constant humidity device and a sample gas constant humidity method. Technical Background

[0002] With the intensification of urbanization and the continuous deterioration of air quality, China's air pollution has shifted from coal-fired pollution to a severe, complex pollution type involving multiple pollutants such as vehicle exhaust and industrial emissions. Ambient air quality has become a major concern. Although people can access information about ambient air quality online, its spatial limitations prevent accurate knowledge of the air quality in specific locations. Therefore, numerous ambient air monitoring devices have emerged. Detection of PM2.5, PM10, O3, SO2, NO2, and CO in ambient air generally requires specific humidity levels to ensure accuracy. However, existing instruments typically reduce the humidity of the sample gas after collection by passing air through a drying chamber or using backflushing to lower the humidity before it enters the corresponding detection module. These methods require frequent replacement of the drying chamber or the use of a fixed, dry purge gas source, increasing both equipment costs and instrument size. Summary of the Invention

[0003] The purpose of this invention is to overcome the problems of complex structure and high cost of sample gas constant humidity devices in the prior art, and to provide a sample gas constant humidity device.

[0004] Another object of the present invention is to provide a method for constant humidity of sample gas.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A sample gas constant humidity device includes a water storage tank and a condensation device; the water storage tank is provided with a first air inlet and a first air outlet; the condensation device is provided with a second air inlet and a second air outlet; the first air outlet and the second air inlet are connected by an air pipe; the second air outlet is provided with an air outlet pipe; an opening is provided on the side wall of the air outlet pipe; a distribution pipe is embedded in the air outlet pipe; the distribution pipe is provided with an adapter; the adapter extends out of the air outlet pipe from the opening.

[0007] Preferably, a peristaltic pump is provided between the water storage tank and the condensation device, and the peristaltic pump is connected to the water storage tank and the condensation device respectively through a conduit.

[0008] The aforementioned sample gas humidity control device includes a condenser, which is a tank or box with a cooling function. During use, a small amount of water is placed inside the condenser. An air pump draws outside air into the water tank through the first air inlet. The water tank contains water, increasing the air pressure. The water-laden air then moves from the water tank to the condenser through the first air outlet and an air pipe. The water-laden air then condenses inside the condenser, reducing its moisture content. Simultaneously, the increased air pressure inside the condenser creates backflushing air, which exchanges moisture with the sample gas in the sampling tube.

[0009] An air pump draws outside air into the water storage tank. The moisture-saturated air then condenses at the condenser, leaving the moisture inside. This causes the water level in the condenser to rise. When the water level in the condenser is below the conduit connecting to the peristaltic pump, the pump only draws a small amount of air from the condenser into the water storage tank, preventing a decrease in backflush air pressure that could affect moisture exchange between the backflush air and the sample gas. When the water level in the condenser reaches the conduit connecting to the peristaltic pump, the pump operates, drawing water from the condenser into the water storage tank, maintaining the water level in the condenser below a predetermined value.

[0010] A nano-distribution pipe is installed inside the outlet pipe. Sample gas is blown in through the nano-distribution pipe, and the gas condensed in the condensation device forms backflush gas, which is blown out through the outlet pipe. When the humidity in the sample gas is higher than that in the backflush gas, water molecules in the sample gas will permeate through the wall of the nano-distribution pipe into the outlet pipe, and then the backflush gas will carry away the water vapor, thus reducing the humidity in the sample gas and achieving the purpose of drying. When the humidity in the sample gas is lower than that in the backflush gas, water molecules in the backflush gas will enter the nano-distribution pipe through the wall of the nano-distribution pipe, thus increasing the humidity in the sample gas and achieving the purpose of humidification.

[0011] Preferably, the first air inlet of the water storage tank is equipped with an air pump.

[0012] Preferably, the sample gas constant humidity device is further provided with a humidity sensor and a temperature sensor; the humidity sensor is located at the adapter; the temperature sensor is located inside the condensation device; the temperature sensor is communicatively connected to the condensation device through a PLC control unit.

[0013] The condenser, temperature sensor, humidity sensor, and nano-distribution tube form a closed loop with negative feedback regulation. When the sample gas humidity is too high, the humidity sensor transmits the data to the temperature sensor, and the PLC control unit lowers the temperature in the condenser. As the temperature decreases, the water vapor in the backflushing gas decreases, and the humidity difference between the sample gas and the backflushing gas in the outlet pipe increases. More water vapor in the sample gas precipitates from the inner wall of the nano-distribution tube and is carried away by the backflushing gas, thus reducing the water vapor in the sample gas. If the humidity in the sample gas decreases, the PLC control unit controls the temperature of the condenser to rise. In the outlet pipe, the humidity difference between the sample gas and the backflushing gas decreases, and less water vapor is carried away, thus automatically maintaining a constant humidity in the sample gas.

[0014] Preferably, the first air inlet is located at the bottom of the side wall of the water storage tank; the first air outlet is located at the top of the water storage tank.

[0015] A method for maintaining constant humidity of sample gas includes the following steps:

[0016] S1. Air is drawn in from the sample gas humidity control device; sample gas is drawn in from the nano-distribution tube;

[0017] S2. A humidity sensor is installed at the junction of the nanotube to read the humidity of the sample gas;

[0018] S3. The humidity sensor transmits the humidity data it reads to the temperature sensor;

[0019] S4. The temperature sensor transmits the temperature data to the PLC control unit; the PLC control unit controls the condenser to lower or raise the temperature based on the temperature information, and controls the air humidity inside the condenser.

[0020] Compared with the prior art, the present invention has the following technical effects:

[0021] This invention provides a sample gas humidity control device that employs a water circulation design. An air pump draws room-temperature air into a water storage tank, which then carries the water vapor from the tank into a condensation device. The water vapor condenses into water in the condensation device, thus maintaining a constant humidity level and avoiding the need for frequent parts replacement. By using a PLC control unit, the condensation device, temperature sensor, humidity sensor, and nanometer tube are integrated into a closed loop with negative feedback regulation, ensuring the sample gas remains in a constant humidity state. Using air as the gas source avoids the use of a fixed, dry gas source, reducing costs. Attached Figure Description

[0022] Figure 1 Schematic diagram of the sample gas constant humidity device according to an embodiment of the present invention;

[0023] Figure 2 Schematic diagram of the outlet pipe, the intake pipe, and the airflow in an embodiment of the present invention;

[0024] Figure 3 Schematic diagram of the air outlet pipe in an embodiment of the present invention;

[0025] Figure 4 A schematic diagram of the humidity control system according to an embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1-Air pump, 2-Water storage tank, 21-First air inlet, 22-First air outlet, 3-Peristaltic pump, 4-Condensation device, 41-Second air inlet, 42-Second air outlet, 43-Outlet pipe, 44-Opening, 45-Inlet / outlet pipe, 46-Adapter. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below with reference to specific embodiments and accompanying drawings. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0029] Example

[0030] like Figures 1 to 3 As shown, a sample gas constant humidity device includes a water storage tank 2 and a condenser 4; the water storage tank 2 is provided with a first air inlet 21 and a first air outlet 22; the condenser 4 is provided with a second air inlet 41 and a second air outlet 42; the first air outlet 22 and the second air inlet 41 are connected by an air pipe; the second air outlet 41 is provided with an air outlet pipe 43; an opening 44 is provided on the side wall of the air outlet pipe 43; a receiving pipe 45 is embedded in the air outlet pipe 43; the receiving pipe 45 is provided with an adapter 46; the adapter 46 extends out of the air outlet pipe 43 from the opening 44.

[0031] The nano-distribution tube 45 is embedded inside the outlet tube 43, and the backflush gas and sample gas interact in a countercurrent manner, which makes it easier to exchange moisture.

[0032] A peristaltic pump 3 is installed between the water storage tank 2 and the condensation device 4. The peristaltic pump 3 is connected to the water storage tank 2 and the condensation device 4 respectively through a conduit.

[0033] An air pump 1 is installed at the first air inlet 21 of the water storage tank 2.

[0034] like Figure 4As shown, the sample gas constant humidity device is also equipped with a humidity sensor and a temperature sensor; the humidity sensor is located in the adapter 46; the temperature sensor is located inside the condensation device 4; the temperature sensor is connected to the condensation device 4 via a PLC control unit.

[0035] The first air inlet 21 is located at the bottom of the side wall of the water storage tank 2; the first air outlet 22 is located at the top of the water storage tank 2.

[0036] A method for maintaining constant humidity of sample gas includes the following steps:

[0037] S1. Air is drawn in from the sample gas humidity control device according to claims 1 to 5; sample gas is drawn in from the nano-distribution tube;

[0038] S2. A humidity sensor is installed at the junction of the nanotube to read the humidity of the sample gas;

[0039] S3. The humidity sensor transmits the humidity data it reads to the temperature sensor;

[0040] S4. The temperature sensor transmits the temperature data to the PLC control unit; the PLC control unit controls the condenser to lower or raise the temperature based on the temperature information, and controls the air humidity inside the condenser.

[0041] In operation, the adapter is connected to the testing equipment. An air pump draws outside air into the water tank, increasing the pressure. The air, now containing moisture, enters the condensation unit. Upon contact with the cold air, the moisture content decreases, and the water vapor condenses inside the condensation unit. The dried air then enters the outlet pipe, where it exchanges moisture with the sample gas in the nano-distribution tube. When the water level in the condensation unit exceeds a preset value, a peristaltic pump returns the water to the water tank. This water circulation design avoids the need for frequent parts replacement. A humidity sensor located at the adapter in the nano-distribution tube reads the humidity of the sample gas entering the testing device. The humidity sensor transmits the data to a temperature sensor, which in turn transmits the data to a PLC control unit to regulate the temperature within the condensation unit, thus ensuring a constant humidity level for the sample gas.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A method for maintaining constant humidity of sample gas, characterized in that, Includes the following steps: S1. Air is drawn in from the sample gas humidity control device; Sample gas is drawn in through the nano-splitter; S1-1. The air pump (1) draws outside air into the water storage tank (2) from the first air inlet (21) at the bottom of the side wall of the water storage tank (2). The water storage tank (2) contains water, and the air pressure inside the water storage tank (2) increases. The air with water vapor moves from the water storage tank (2) to the condenser (4) through the air pipe via the first air outlet (22). S1-2. Air containing water vapor condenses in the condenser (4) and its water content decreases. At the same time, the air pressure in the condenser (4) increases to form backflush air. A small amount of water is added to the condenser. When the water level in the condenser (4) is lower than the conduit connecting the peristaltic pump (3), the peristaltic pump (3) can only draw a small amount of air from the condenser (4) into the water storage tank (2), which will not cause the pressure of the backflush air to decrease and affect the water exchange between the backflush air and the sample gas. When the water level in the condenser (4) reaches the conduit connecting the peristaltic pump (3), the peristaltic pump (3) will operate to draw the water in the condenser (4) into the water storage tank (2), keeping the water in the condenser (4) below the given value. S1-3. A nano-distribution pipe (45) is installed inside the outlet pipe (43). The sample gas is blown in through the nano-distribution pipe (45), and the gas condensed in the condensation device (4) forms backflush gas which is blown out through the outlet pipe (43). When the humidity in the sample gas is higher than that in the backflush gas, the water molecules in the sample gas will permeate through the wall of the nano-distribution pipe (45) into the outlet pipe (43), and then the backflush gas will carry away the water vapor. At this time, the humidity in the sample gas will decrease, thereby achieving the purpose of drying. When the humidity in the sample gas is lower than that in the backflush gas, the water molecules in the backflush gas will enter the nano-distribution pipe (45) through the wall of the nano-distribution pipe (45), and the humidity in the sample gas will increase, thereby achieving the purpose of humidification. S2. A humidity sensor is installed at the junction of the nanotube to read the humidity of the sample gas; S3. The humidity sensor transmits the humidity data it reads to the temperature sensor; S3-1. The condenser (4), temperature sensor, humidity sensor and nanotube (45) are combined into a closed loop with negative feedback regulation. S4. The temperature sensor transmits the temperature data to the PLC control unit; the PLC control unit controls the condenser to lower or raise the temperature based on the temperature information, and controls the air humidity inside the condenser. S4-1. When the sample gas humidity is too high, the humidity sensor transmits the data to the temperature sensor. The PLC control unit will lower the temperature in the condensation device (4). As the temperature decreases, the water vapor in the backflush gas will decrease. The humidity difference between the sample gas and the backflush gas in the outlet pipe (43) will increase. More water vapor in the sample gas will be precipitated from the inner wall of the distribution pipe (45) and carried away by the backflush gas, thereby reducing the water vapor in the sample gas. If the humidity in the sample gas decreases, the PLC control unit controls the temperature of the condensation device (4) to rise. In the outlet pipe (43), the humidity difference between the sample gas and the backflush gas decreases, and the water vapor carried away decreases. In this way, the humidity in the sample gas is automatically kept constant. The sample gas constant humidity device includes a water storage tank (2) and a condenser (4); the water storage tank (2) is provided with a first air inlet (21) and a first air outlet (22); the condenser (4) is provided with a second air inlet (41) and a second air outlet (42); the first air outlet (22) and the second air inlet (41) are connected by an air pipe; the second air outlet (42) is provided with an air outlet pipe (43); an opening (44) is provided on the side wall of the air outlet pipe (43); a distribution pipe (45) is embedded in the air outlet pipe (43); the distribution pipe (45) is provided with an adapter (46); the adapter (46) extends out of the air outlet pipe (43) from the opening (44); A peristaltic pump (3) is provided between the water storage tank (2) and the condensation device (4), and the peristaltic pump (3) is connected to the water storage tank (2) and the condensation device (4) respectively through a conduit; The first air inlet (21) of the water storage tank (2) is equipped with an air pump (1); The sample gas constant humidity device is also equipped with a humidity sensor and a temperature sensor; the humidity sensor is located at the adapter (46); The temperature sensor is installed inside the condensation device (4); the temperature sensor is connected to the condensation device (4) via a PLC control unit; The first air inlet (21) is located at the bottom of the side wall of the water storage tank (2); the first air outlet (22) is located at the top of the water storage tank (2).

Images