TVOC (Total Volatile Organic Compound) inorganized emission online monitoring equipment

Abstract

The utility model discloses TVOC (total volatile organic compound) unorganized emission on-line monitoring equipment which comprises a box body, a filter, a cooler, a heater and two dryers are arranged in the box body, the dryers are filled with drying agents capable of recovering moisture absorption capacity through heating, a gas inlet of the filter is connected with a detection gas inlet, and a gas outlet of the cooler is connected with a gas outlet of the heater. A gas outlet of the filter is connected with a gas inlet of the cooler, a gas outlet of the cooler is connected with the first gas inlet ends of the two dryers through the first electromagnetic three-way valve, and the first gas outlet ends of the two dryers are connected with one gas inlet of the gas change-over switch through the second electromagnetic three-way valve. And the other gas inlet of the gas change-over switch is connected with a standard gas tank. According to the TVOC unorganized emission on-line monitoring equipment provided by the utility model, the filter, the cooler and the dryer are arranged for pre-treating detection gas, so that the consistency of indexes of the detection gas is ensured, a detection probe is prevented from being damaged, and the service life of the equipment is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas detection technical field, concretely relates to a TVOC unorganized emission on -line monitoring equipment. BACKGROUND

[0002] TVOC (Total Volatile Organic Compounds, total volatile organic compounds) refers to the organic matter that the saturated vapor pressure is more than 133.32Pa under room temperature, and its boiling point is 50 DEG C to 250 DEG C, and can exist in the form of evaporation in air at normal temperature, and its toxicity, irritability, carcinogenicity and special odor can influence skin and mucous membrane and produce acute damage to human body. Research shows that TVOC has irritant smell, and some compounds have genotoxicity. TVOC can cause body immune level disorder, influence central nervous system function, and appear dizzy, headache, sleepiness, weakness, chest tightness and other conscious symptoms;It can also influence digestive system, appear anorexia, nausea and the like, and seriously can damage liver and hematopoietic system, and appear allergic reaction. TVOC unorganized emission refers to the phenomenon that TVOC (total volatile organic compounds) is directly discharged to the environment without exhaust cylinder or chimney under the condition that there is no closed equipment or sealing measure is imperfect.

[0003] In the prior art, the detection of TVOC only considers simple gas detection, without considering pretreatment of the gas to be detected, so that the service life of the detection probe is reduced or the detection precision is reduced due to improper use. Some processing equipment will lose activity after working for a period of time, and manual regular replacement is required, which also increases the maintenance cost to some extent. UTILITY MODEL CONTENT

[0004] 1. The technical problem to be solved is:

[0005] In view of the above technical problems, the utility model provides a TVOC unorganized emission on-line monitoring equipment.

[0006] 2. Technical scheme:

[0007] An online monitoring device for fugitive TVOC emissions includes a housing. Inside the housing are a filter, a cooler, a heater, and two dryers. Each dryer is filled with a desiccant whose moisture absorption capacity can be restored by heating. The filter's inlet is connected to a detection gas inlet, and its outlet is connected to the cooler's inlet. The cooler's outlet is connected to the first inlet of the two dryers via a first electromagnetic three-way valve. The first outlets of the two dryers are connected to one inlet of a gas switching switch via a second electromagnetic three-way valve. The other inlet of the gas switching switch is connected to a standard gas tank. The gas switching switch's outlet is connected to the inlet of an air pump, and the air pump's outlet is connected to the inlet of a detection module. The detection module's outlet is connected to the detection gas outlet. The heater's inlet is connected to a heat exchange gas inlet, and its outlet is connected to the second inlet of the two dryers via a third electromagnetic three-way valve. The second outlets of the two dryers are connected to the inlet of a heat exchange pump via a fourth electromagnetic three-way valve, and the heat exchange pump's outlet is connected to the heat exchange gas outlet.

[0008] Furthermore, the enclosure is also equipped with a power supply module for powering the entire device.

[0009] Furthermore, a flow meter is also provided on the door of the enclosure, and the flow meter is connected between the air intake pump and the gas conversion switch.

[0010] Furthermore, both the cooler and the heater are equipped with heat-conducting fins inside. Two heat-conducting fins extend from the top of the cooler and the heater to the outside and are connected by heat-conducting copper pipes. The heat-conducting copper pipes transfer heat from the cooler to the heater.

[0011] Furthermore, an auxiliary heating box is provided between the heater and the third electromagnetic three-way valve, and an electric heating wire is provided inside the auxiliary heating box.

[0012] Furthermore, the cabinet door is also equipped with a control display module for controlling the operation of the entire device.

[0013] Preferably, the dryer is filled with silica gel desiccant.

[0014] Preferably, the filter is a backflush filter.

[0015] 3. Beneficial effects:

[0016] This utility model provides an online monitoring device for fugitive TVOC emissions. It is equipped with a filter, a cooler, and a dryer to pre-treat the gas being detected, ensuring the consistency of the gas indicators, avoiding damage to the detection probe, and improving the service life of the device. The filter is a backflush filter, and two sets of dryers are provided. When one dryer is working, the silica gel desiccant in the other dryer can be regenerated by drying, achieving the purpose of recycling and reuse. During drying, a portion of the heat from the cooler can be utilized, resulting in high energy utilization and energy saving. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the internal structure of the TVOC fugitive emission online monitoring device of this utility model;

[0018] Figure 2 This is a schematic diagram of the connection structure between the heater and the cooler of this utility model. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings.

[0020] As attached Figure 1 To be continued Figure 2 As shown, Specific implementation examples:

[0022] An online monitoring device for fugitive TVOC emissions includes a housing 1. Inside the housing 1 are a filter 2, a cooler 3, a heater 4, and two dryers 5. Each dryer 5 is filled with a desiccant whose moisture absorption capacity can be restored by heating. The inlet of the filter 2 is connected to the detection gas inlet, and the outlet of the filter 2 is connected to the inlet of the cooler 3. The outlet of the cooler 3 is connected to the first inlet of the two dryers 5 via a first electromagnetic three-way valve 6. The first outlet of the two dryers 5 is connected to one of the inlets of a gas switching switch 12 via a second electromagnetic three-way valve 7. Another inlet of the gas switching switch 12 is connected to the standard gas tank 13. The outlet of the gas switching switch 12 is connected to the inlet of the air pump 8. The outlet of the air pump 8 is connected to the inlet of the detection module 9. The outlet of the detection module 9 is connected to the detection gas outlet. The inlet of the heater 4 is connected to the heat exchange gas inlet. The outlet of the heater 4 is connected to the second inlet of the two dryers 5 through the third electromagnetic three-way valve 10. The second outlet of the two dryers 5 is connected to the inlet of the heat exchange pump 14 through the fourth electromagnetic three-way valve 11. The outlet of the heat exchange pump 14 is connected to the heat exchange gas outlet. The housing 1 is also equipped with a power supply module 15 for powering the entire device.

[0023] When the TVOC fugitive emission online monitoring device of this utility model is working, the detection module 9 is calibrated first. At this time, the standard gas tank 13, gas conversion switch 12, and air inlet pump 8 are connected to the detection module 9, and the standard gas enters the detection module 9 for calibration. When detecting fugitive emission of ambient gas, the gas to be detected first passes through the filter 2 from the detection gas inlet, and then is cooled to a suitable temperature through the cooler 3. One of the dryers 5 is selected for drying through the first electromagnetic three-way valve 6. After drying, it is sent to the detection module 9 for detection through the second electromagnetic three-way valve 7, gas conversion switch 12, and air inlet pump 8. On the other side, the heat exchange gas enters the heater 4 from the heat exchange gas inlet and is heated. It is then connected to another dryer 5 through the third electromagnetic three-way valve 10. The desiccant in the heat exchanger 5 is desorbed and regenerated under the action of the high temperature gas. One dryer 5 is switched to the other dryer 5 after absorbing moisture for a period of time. The two dryers 5 are used alternately in a cycle. One dryer 5 is working to absorb moisture, and the other dryer 5 is regenerating at the same time. The exchange of this process is controlled by four electromagnetic three-way valves. It should be noted that the sampling points of the gas to be detected and the heat exchange gas are a certain distance apart, and the heat exchange gas is clean, room-temperature air far away from the location of the gas to be detected.

[0024] The door of the housing 1 is also equipped with a flow meter, which is connected between the air inlet pump 8 and the gas conversion switch 12 to measure the amount of gas to be tested or standard gas entering.

[0025] Both the cooler 3 and the heater 4 are equipped with heat-conducting fins 16 inside. Two heat-conducting fins 16 extend from the top of the cooler 3 and the heater 4 to the outside and are connected by heat-conducting copper pipes 17. The heat-conducting copper pipes 17 transfer heat from the cooler 3 to the heater 4. The heat-conducting fins 16 and the heat-conducting copper pipes 17 work together to transfer heat from the cooler 3 to the heater 4, heating the heat exchange gas in the heater 4 and saving some energy.

[0026] An auxiliary heating box 18 is provided between the heater 4 and the third electromagnetic three-way valve 10. The auxiliary heating box 18 is equipped with an electric heating wire, which provides auxiliary heating so that the heat exchange gas can reach the preset temperature. It is mainly used when the temperature of the gas to be detected fluctuates greatly, causing the heat exchange gas in the heater 4 to fail to reach the preset temperature.

[0027] The door of the enclosure 1 is also equipped with a control display module, which is used to control the operation of the entire equipment and control each component to operate according to the preset mode.

[0028] Preferably, the dryer 5 is filled with silica gel desiccant, which can be regenerated at high temperature to restore its moisture absorption capacity.

[0029] Preferably, the filter 2 is a backflush filter 2, which removes dust from the filter screen by backflush, and can be reused without the need for manual replacement of the filter element.

[0030] Although the present invention has been disclosed above with reference to preferred embodiments, these are not intended to limit the present invention. Anyone skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope of protection of the claims of this application.

Claims

1. An online monitoring device for fugitive TVOC emissions, characterized in that, The device includes a housing, inside which are a filter, a cooler, a heater, and two dryers. Each dryer contains a desiccant whose moisture absorption capacity can be restored by heating. The filter's inlet is connected to a detection gas inlet, and its outlet is connected to the cooler's inlet. The cooler's outlet is connected to the first inlet of both dryers via a first solenoid three-way valve. The first outlets of both dryers are connected to one inlet of a gas switching switch via a second solenoid three-way valve. The other inlet of the gas switching switch is connected to a standard gas tank. The outlet of the gas switching switch is connected to the inlet of an air pump. The outlet of the air pump is connected to the inlet of a detection module, and the outlet of the detection module is connected to the detection gas outlet. The heater's inlet is connected to a heat exchange gas inlet, and its outlet is connected to the second inlet of both dryers via a third solenoid three-way valve. The second outlets of both dryers are connected to the inlet of a heat exchange pump via a fourth solenoid three-way valve, and the outlet of the heat exchange pump is connected to the heat exchange gas outlet.

2. The TVOC fugitive emission online monitoring device according to claim 1, characterized in that, The enclosure also contains a power supply module for powering the entire device.

3. The TVOC fugitive emission online monitoring device according to claim 2, characterized in that, The box door is also equipped with a flow meter, which is connected between the air intake pump and the gas conversion switch.

4. The online monitoring device for fugitive TVOC emissions according to claim 3, characterized in that, Both the cooler and the heater are equipped with heat-conducting fins inside. Two heat-conducting fins extend from the top of the cooler and the heater to the outside and are connected by heat-conducting copper pipes. The heat-conducting copper pipes transfer heat from the cooler to the heater.

5. The TVOC fugitive emission online monitoring device according to claim 4, characterized in that, An auxiliary heating box is provided between the heater and the third electromagnetic three-way valve, and an electric heating wire is provided inside the auxiliary heating box.

6. The online monitoring device for fugitive TVOC emissions according to any one of claims 1-5, characterized in that, The enclosure door is also equipped with a control display module for controlling the operation of the entire device.

7. The online monitoring device for fugitive TVOC emissions according to claim 6, characterized in that, The dryer is filled with silica gel desiccant.

8. The TVOC fugitive emission online monitoring device according to claim 6, characterized in that, The filter is a backflush filter.

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