Organic volatile gas on-line monitoring system

Abstract

According to the organic volatile gas online monitoring system provided by the invention, an output port of a gas pump is hermetically communicated with an output port of an expansion cavity, and the expansion cavity, a cooling cavity and a detection cavity are hermetically communicated in sequence; a particulate matter filter screen is arranged in the expansion cavity, a dehumidification filter screen is arranged in the cooling cavity, the cooling cavity is divided into a front cavity and a rear cavity by the filter screens, a semiconductor refrigeration element and a heating element are further arranged in the cooling cavity, the cold end of the semiconductor refrigeration element is located in the front cavity, and the hot end of the semiconductor refrigeration element is located in the rear cavity. The hot end of the semiconductor refrigeration element is located on the outer side of the cooling cavity, and the heating element is arranged in the rear cavity. A concentration sensor for detecting the concentration of the organic volatile gas is arranged in the detection cavity; the system further comprises a control unit, the signal input end of the control unit is connected to the output end of the concentration sensor, the control unit is further used for controlling the semiconductor refrigeration element, the heating element and the air pump to work, and the control unit is in communication connection with a remote monitoring center.

Description

Technical Field

[0001] The invention relates to a gas concentration detection system, in particular to an organic volatile gas online monitoring system. Background Art

[0002] In the production of chemical industry, a large amount of organic waste is often generated. These organic wastes are often prone to produce organic volatile gases. Although these organic wastes are often treated in chemical production to prevent environmental pollution, these organic volatile gases will still escape and cause environmental pollution.

[0003] In the prior art, volatile organic gases are sampled and then transported to a laboratory for analysis and detection using a chromatograph or the like. This method has high analytical accuracy, but is not very real-time and the process is complicated. Blank processing is also required, such as transport blanks and full-process blanks, which makes the process more complicated. Although some online monitoring methods are proposed in the prior art, sensors are set in the measured environment for monitoring to ensure the timeliness of monitoring. However, due to the influence of environmental factors, such as temperature, humidity, particulate matter, etc., the accuracy of the existing online monitoring methods is greatly affected.

[0004] Therefore, in order to solve the above technical problems, it is urgent to propose a new technical means. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide an online monitoring system for volatile organic gases, which can realize online monitoring of the concentration of volatile organic gases on site in the measured environment, thereby ensuring the timeliness of the monitoring data. On the other hand, it can effectively eliminate the interference of environmental factors, thereby improving the accuracy of online detection results, providing timely and accurate data support for subsequent environmental governance, and improving monitoring efficiency.

[0006] The present invention provides an online monitoring system for volatile organic gases, comprising an air pump, an expansion cavity, a cooling cavity and a detection cavity;

[0007] The output port of the air pump is in sealed communication with the output port of the expansion cavity, and the expansion cavity, the cooling cavity and the detection cavity are in sealed communication in sequence;

[0008] A particle filter is provided in the expansion cavity, a dehumidification filter is provided in the cooling cavity, the filter separates the cooling cavity into a front cavity and a rear cavity, a semiconductor refrigeration element and a heating element are also provided in the cooling cavity, the cold end of the semiconductor refrigeration element is located in the front cavity, the hot end of the semiconductor refrigeration element is located outside the cooling cavity, and the heating element is provided in the rear cavity;

[0009] The detection cavity is provided with a concentration sensor for detecting the concentration of volatile organic gases;

[0010] It also includes a control unit, the signal input end of the control unit is connected to the output end of the concentration sensor, the control unit is also used to control the operation of the semiconductor refrigeration element, the heating element and the air pump, and the control unit is connected to the remote monitoring center for communication.

[0011] Furthermore, staggered baffles are provided in the expansion cavity.

[0012] Furthermore, an inclined surface is arranged in the front chamber of the cooling cavity, the cold end of the semiconductor refrigeration element is located on the inclined surface, the input port of the cooling cavity is opposite to the inclined surface, and the dehumidification filter is arranged at the end of the inclined surface.

[0013] Furthermore, the control unit includes a processor, a positioning module, a timing module and a wireless transmission module. The processor is used to receive the concentration signal of the volatile organic gas output by the concentration sensor, and the processor also outputs control signals to the air pump, the heating element and the semiconductor refrigeration element. The positioning module and the timing module are communicatively connected to the processor, and the processor is communicatively connected to the remote monitoring center via the wireless communication module.

[0014] Furthermore, a humidity sensor is included, and the humidity sensor is used to detect the air humidity in the rear chamber, and a humidity signal of the humidity sensor is input into the processor.

[0015] Furthermore, it also includes a temperature sensor, wherein there are two temperature sensors, one for detecting the measured ambient temperature, and the other for detecting the temperature in the rear chamber of the cooling cavity, and the output end of the temperature sensor is connected to the processor.

[0016] Furthermore, it also includes a wind direction sensor and a wind speed sensor, and the output ends of the wind direction sensor and the wind speed sensor are connected to the processor.

[0017] Further, the remote monitoring center includes a monitoring server, a storage server, a touch display and an audible and visual alarm;

[0018] The monitoring server is connected to the processor through a wireless communication module, the storage server is connected to the monitoring server, the touch display is connected to the monitoring server, and the control output end of the monitoring server is connected to the sound and light alarm.

[0019] The beneficial effects of the present invention are as follows: Through the present invention, the concentration of volatile organic gases can be monitored online on-site in the tested environment, thereby ensuring the timeliness of the monitoring data. On the other hand, the interference of environmental factors can be effectively eliminated, thereby improving the accuracy of the online detection results, providing timely and accurate data support for subsequent environmental management, and improving monitoring efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0021] Figure 1 It is a schematic diagram of the structure of the present invention.

[0022] Figure 2 It is a top view of the expansion cavity of the present invention.

[0023] Figure 3 It is a schematic diagram of the cooling cavity structure of the present invention. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below:

[0025] The present invention provides an online monitoring system for volatile organic gases, comprising an air pump, an expansion cavity 1, a cooling cavity 13 and a detection cavity; wherein the shell of the detection cavity is made of existing thermal insulation materials, thereby reducing the influence of external temperature on the interior of the cavity;

[0026] The output port of the air pump is in sealed communication with the output port of the expansion cavity, and the expansion cavity, the cooling cavity and the detection cavity are in sealed communication in sequence;

[0027] The expansion cavity 1 is provided with a particle filter 3, which is used to filter out large solid particles in the air to prevent the probe of the concentration sensor from being affected. The cooling cavity 13 is provided with a dehumidification filter 10, which separates the cooling cavity into a front cavity 6 and a rear cavity 12. The cooling cavity is also provided with a semiconductor refrigeration element 14 and a heating element 11. The cold end of the semiconductor refrigeration element is located in the front cavity, the hot end of the semiconductor refrigeration element is located outside the cooling cavity, and the heating element is arranged in the rear cavity.

[0028] The detection cavity is provided with a concentration sensor for detecting the concentration of volatile organic gases;

[0029] It also includes a control unit, the signal input end of the control unit is connected to the output end of the concentration sensor, the control unit is also used to control the semiconductor refrigeration element, the heating element and the air pump, and the control unit is connected to the remote monitoring center. The semiconductor refrigeration element can be made of existing technology, which will not be described in detail here. The heating element is composed of an existing heating wire and an electronic switch. The electronic switch is used to control the circuit between the heating wire and the power supply. The electronic switch is controlled by a processor and is implemented by an existing MOS switch, a triode or an electromagnetic relay.

[0030] In this embodiment, Figure 2 As shown, the expansion chamber 1 is provided with staggered baffles 2, and the baffles are used to slow down the airflow input by the air pump to prevent the airflow from moving too fast and causing subsequent effects, thereby facilitating subsequent temperature control and humidity control.

[0031] In this embodiment, an inclined surface 5 is provided in the front chamber of the cooling cavity, the cold end of the semiconductor refrigeration element is located on the inclined surface 5, the input port of the cooling cavity is facing the inclined surface, and the dehumidification filter is provided at the end of the inclined surface. Figure 3 As shown, the role of the slope is to reduce the flow rate, which is convenient for cooling under high temperature conditions, and also convenient for gathering the air flow under low temperature conditions to facilitate the subsequent heating elements to heat the air. The dehumidification filter is used to remove water vapor in the air and reduce the impact on the concentration sensor probe.

[0032] A protrusion 8 is also provided at the end of the inclined surface, and a baffle 9 is also provided corresponding to the protrusion. The baffle completely separates the bottom of the front chamber and the rear chamber, and the baffle has an inclined structure on the side facing the input port of the cooling cavity, thereby effectively preventing condensed water from entering the rear chamber. The dehumidification filter is located between the protrusion and the baffle, and a drain pipe 7 is provided at the bottom of the front chamber. The drain pipe is used for drainage control through a solenoid valve controlled by a processor.

[0033] In this embodiment, the control unit includes a processor, a positioning module, a timing module and a wireless transmission module. The processor is used to receive the concentration signal of the organic volatile gas output by the concentration sensor, and the processor also outputs control signals to the air pump, the heating element and the semiconductor refrigeration element. The positioning module and the timing module are communicated with the processor, and the processor is communicated with the remote monitoring center through the wireless communication module. The positioning module is used to characterize the location information of the current monitoring point, and it adopts the GPS positioning module or the Beidou positioning module. The timing module adopts the existing GPS timing circuit to ensure the synchronization of the entire system, and also provides accurate clock information for the control of the processor.

[0034] In this embodiment, a humidity sensor is also included, which is used to detect the air humidity in the rear chamber and the humidity signal of the humidity sensor is input into the processor. Although the dehumidification filter reduces the humidity, it does not completely remove it. Therefore, the monitoring result is corrected by using the existing algorithm through the humidity signal.

[0035] In this embodiment, a temperature sensor is also included. There are two temperature sensors, one for detecting the measured ambient temperature and the other for detecting the temperature in the rear chamber of the cooling cavity. The output end of the temperature sensor is connected to the processor.

[0036] In this embodiment, a wind direction sensor and a wind speed sensor are also included, and the output ends of the wind direction sensor and the wind speed sensor are connected to the processor, wherein the signals output by the wind direction sensor and the wind speed sensor are used by the monitoring center to correct the organic volatile gas concentration signal at the current location. Because both wind speed and wind direction have an impact on the concentration, corresponding corrections are made based on the wind speed information, and the correction process can use existing technology.

[0037] In this embodiment, the remote monitoring center includes a monitoring server, a storage server, a touch display, and an audible and visual alarm;

[0038] The monitoring server is connected to the processor through a wireless communication module, the storage server is connected to the monitoring server, the touch display is connected to the monitoring server, and the control output end of the monitoring server is connected to the sound and light alarm.

[0039] The wireless communication module uses the existing 5G module, and the sound and light alarm is used to warn of the concentration of volatile organic gases.

[0040] During monitoring, the processor starts the air pump according to the set cycle, and the air enters the expansion cavity to decelerate and filter out solid particles, thereby preventing solid particles from adhering to the probe of the concentration sensor and affecting the measurement accuracy. After passing through the expansion cavity, it enters the cooling cavity. The processor determines whether to start the semiconductor refrigeration element or the heating element according to the current ambient temperature, because too high or too low temperature will affect the monitoring accuracy of the concentration sensor. Through the operation of the semiconductor refrigeration element or the heating element, the inflowing air is limited to the set temperature range, thereby helping to improve the accuracy. For the concentration sensor, the existing concentration sensor is used according to the detection target. For example, for alkane organic volatile gases, an alkane concentration sensor is used, and for methane, a methane sensor is used.

[0041] Figure 2 and Figure 3 In the figure, arrows indicate the gas flow direction.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An organic volatile gas online monitoring system, characterized in that: It includes an air pump, an expansion cavity, a cooling cavity and a detection cavity; The output port of the air pump is in sealed communication with the output port of the expansion cavity, and the expansion cavity, the cooling cavity and the detection cavity are in sealed communication in sequence; A particle filter is provided in the expansion cavity, a dehumidification filter is provided in the cooling cavity, the filter separates the cooling cavity into a front cavity and a rear cavity, a semiconductor refrigeration element and a heating element are also provided in the cooling cavity, the cold end of the semiconductor refrigeration element is located in the front cavity, the hot end of the semiconductor refrigeration element is located outside the cooling cavity, and the heating element is provided in the rear cavity; The detection cavity is provided with a concentration sensor for detecting the concentration of volatile organic gases; It also includes a control unit, the signal input end of the control unit is connected to the output end of the concentration sensor, the control unit is also used to control the operation of the semiconductor refrigeration element, the heating element and the air pump, and the control unit is connected to the remote monitoring center for communication.

2. The organic volatile gas online monitoring system according to claim 1, characterized in that: The expansion cavity is provided with staggered baffles.

3. The organic volatile gas online monitoring system according to claim 1 is characterized in that: An inclined surface is arranged in the front chamber of the cooling cavity, the cold end of the semiconductor refrigeration element is located on the inclined surface, the input port of the cooling cavity is directly opposite to the inclined surface, and the dehumidification filter is arranged at the end of the inclined surface.

4. The organic volatile gas online monitoring system according to claim 1 is characterized in that: The control unit includes a processor, a positioning module, a timing module and a wireless transmission module. The processor is used to receive the concentration signal of the volatile organic gas output by the concentration sensor, and the processor also outputs control signals to the air pump, the heating element and the semiconductor refrigeration element. The positioning module and the timing module are communicatively connected to the processor, and the processor is communicatively connected to the remote monitoring center via the wireless communication module.

5. The organic volatile gas online monitoring system according to claim 4 is characterized in that: The device also includes a humidity sensor for detecting the air humidity in the rear chamber, and a humidity signal of the humidity sensor is input into the processor.

6. The organic volatile gas online monitoring system according to claim 4 is characterized in that: It also includes two temperature sensors, one for detecting the measured ambient temperature and the other for detecting the temperature in the rear chamber of the cooling cavity. The output end of the temperature sensor is connected to the processor.

7. The organic volatile gas online monitoring system according to claim 4, characterized in that: It also includes a wind direction sensor and a wind speed sensor, and the output ends of the wind direction sensor and the wind speed sensor are connected to the processor.

8. The organic volatile gas online monitoring system according to claim 4 is characterized by: The remote monitoring center includes a monitoring server, a storage server, a touch display and an audible and visual alarm; The monitoring server is connected to the processor through a wireless communication module, the storage server is connected to the monitoring server, the touch display is connected to the monitoring server, and the control output end of the monitoring server is connected to the sound and light alarm.

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