Tail gas sampling device of methanol and formaldehyde engine
By designing a device that can switch off exhaust gas collection when different powers, using two sets of the same collection columns for synchronous collection, and heating the intake pipe at constant temperature, the problems of the existing collection device in adsorption saturation and water vapor condensation are solved, and more comprehensive and accurate exhaust gas collection and detection are achieved.
Patent Information
- Application Number
- CN202421515352.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2034-06-28
AI Technical Summary
The existing methanol collection columns or formaldehyde collection columns have problems in collecting engine exhaust gases, affecting the detection results of water vapor condensation, and only collecting exhaust gases at a single power, resulting in poor detection results.
A device that can switch off exhaust gas collection at different powers is designed, two sets of the same methanol or formaldehyde collection columns are used for synchronous collection, and the intake pipe is heated at a constant temperature through an electric heating wire and a temperature switch to prevent water vapor from condensing.
It achieves a more comprehensive collection of exhaust gases for engines of different powers, improves the collection and adsorption effect of methanol or formaldehyde gases, reduces the impact of water vapor condensation on the detection results, and ensures the accuracy of subsequent detection and analysis.
Smart Images
Figure CN222895955U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sampling equipment, in particular to an exhaust gas sampling device for methanol and formaldehyde engines. Background Art
[0002] Internal combustion engines that use methanol or formaldehyde as fuel have the following advantages. (1): Methanol or formaldehyde generally only emits carbon dioxide and water, and is much more environmentally friendly than traditional internal combustion engines. (2): The original engine requires little modification, and its economy and emission performance can be improved while maintaining the original power performance. (3): Good fuel economy. Although the combustion calorific value of methanol gasoline is not high, the price of methanol fuel is quite low, so the comprehensive fuel economy of methanol engines is relatively high. (4): High safety. The vapor pressure of methanol is much lower than that of gasoline, and it is less volatile. The vapor specific gravity generated by the operation of the methanol engine is very large, so the possibility of engine misfire, explosion and other dangers is also lower. (5): Strong power and good anti-explosion performance. Methanol, as a high-octane component, can increase the power of the locomotive after being mixed with gasoline and diesel. It is significantly better than gasoline and diesel at high speeds. Methanol can effectively eliminate the deposition and condensation of impurities in the fuel tank and oil system, and has a good oil circuit dredging effect. However, methanol or formaldehyde also has the following technical disadvantages. Specifically, if the combustion performance of the engine is not good, methanol or formaldehyde will not be fully burned, and the engine exhaust will contain harmful gases such as incompletely burned alcohols and aldehydes, which will cause certain pollution to the environment.
[0003] In order to prevent the exhaust gas emitted by internal combustion engines that use methanol or formaldehyde as fuel from polluting the environment, relevant departments will sample the exhaust gas emitted by engines such as automobiles that use the corresponding fuels. When sampling, the tester inserts the air inlet connecting pipe of the methanol collection column (silica gel adsorbent tube) or the formaldehyde collection column (DNPH collection column) into the exhaust pipe of the vehicle. The methanol collection column or the formaldehyde collection column adsorbs the methanol or formaldehyde in the exhaust gas. The subsequent tester removes the methanol collection column or the formaldehyde collection column and conducts detection and analysis in the laboratory through relevant equipment to obtain the specific content of methanol or formaldehyde in the exhaust gas (the methanol collection column uses headspace and gas chromatography-mass spectrometry to obtain data, and the formaldehyde collection column uses the ultraviolet or diode array detector of the high-performance liquid chromatograph to obtain data). Although the existing methanol collection column or formaldehyde collection column meets the sampling needs to a certain extent, due to structural limitations, since only one set of methanol collection column or formaldehyde collection column can be used to collect exhaust gas, in actual situations, if the exhaust gas discharged by the engine contains too much methanol or formaldehyde, the corresponding set of collection columns will be saturated with methanol or formaldehyde in the exhaust gas, and will not be able to absorb too much methanol or formaldehyde, which will have an adverse effect on the detection effect. In addition, since the exhaust gas discharged by the engine has a high temperature, when the water vapor in the exhaust gas encounters the low-temperature air inlet connecting pipe, it is easy to generate condensed water inside it, and methanol or formaldehyde will dissolve in the condensed water, so the adsorption amount of the corresponding gas by the collection column will be reduced, which will lead to deviations in subsequent detection and analysis data. Finally, the existing collection column can only collect and adsorb the corresponding methanol or formaldehyde in the exhaust gas emitted at one engine power at a time, so the collected data is relatively single (under different engine powers, the combustion efficiency may be different, and the methanol or formaldehyde content in the exhaust gas is also different. Under low power, the collection column still has the ability to adsorb the corresponding gas. Under high power, the adsorption of the corresponding gas has reached saturation), and the data from subsequent detection and analysis cannot effectively and truly reflect the exhaust emissions of the engine. Utility Model Content
[0004] In order to overcome the drawbacks of the existing methanol collection column or formaldehyde collection column due to the supporting equipment structure and function limitations as described in the background technology, the utility model provides a methanol collection column and a formaldehyde collection column, which can switch to adsorb and collect the exhaust gas of different powers of engines using methanol and formaldehyde as fuel, and has a wider range of use. By using two sets of the same collection columns to simultaneously collect and adsorb methanol or formaldehyde gas, a better methanol or formaldehyde gas collection and adsorption effect can be achieved. The intake pipe can also be heated at a constant temperature to prevent water vapor from condensing into water as much as possible, which has an adverse effect on the collection and adsorption of methanol or formaldehyde gas. The exhaust gas sampling device for methanol and formaldehyde engines provides favorable technical support for the subsequent accurate detection and analysis of methanol or formaldehyde data in the exhaust gas in the laboratory.
[0005] The technical solution adopted by the utility model to solve its technical problems is:
[0006] A tail gas sampling device for a methanol and formaldehyde engine comprises a methanol collection column, a formaldehyde collection column, a shell, a solenoid valve, an electric proportional valve, an air pump, an electromagnetic vortex flowmeter, an electric heating wire, a temperature switch, and a sampling tube, characterized in that the methanol collection column and the formaldehyde collection column each have at least multiple sets, there are multiple solenoid valves, one end of the sampling tube is connected to one end of the first solenoid valve, the other end of the first solenoid valve is connected in parallel to one end of the other multiple solenoid valves, and the other ends of the other multiple solenoid valves are respectively connected to front joint pipes; the electric proportional valve has at least two sets, the exhaust pipes of the two sets of electric proportional valves are connected in parallel to the intake pipe of the air pump, and the intake pipe of the electromagnetic vortex flowmeter is connected to the exhaust pipe of the air pump; the intake pipes of the two sets of electric proportional valves are respectively installed with rear joint pipes, and the solenoid valve, the electric proportional valve, the air pump, the electromagnetic vortex flowmeter, and the sampling tube are installed in the shell; the electric heating wire is installed on the outside of the sampling tube, and the temperature switch is installed on the outer end of the sampling tube; one end of the temperature switch is electrically connected to one end of the power input of the electric heating wire.
[0007] Furthermore, a handle is movably mounted on the upper end of the shell.
[0008] Furthermore, the solenoid valve is a normally closed valve core solenoid valve.
[0009] Furthermore, the outer side of the electric heating wire is wrapped with a thermal insulation cloth.
[0010] Furthermore, the temperature switch is a snap-action normally closed contact type temperature switch.
[0011] Furthermore, among the multiple sets of methanol collection columns and multiple sets of formaldehyde collection columns, every two sets of methanol collection columns and formaldehyde collection columns constitute a group, and in each group of methanol collection columns and formaldehyde collection columns, the exhaust pipes of the front set of methanol collection columns and formaldehyde collection columns and the air inlet pipes of the rear set of methanol collection columns and formaldehyde collection columns are respectively connected by sleeves through hoses; in two groups of methanol collection columns and formaldehyde collection columns, the air inlet pipes of the front set of methanol collection columns and formaldehyde collection columns and the exhaust pipes of the rear set of methanol collection columns and formaldehyde collection columns are respectively connected to the rear side of one of the front joint pipes and the front side of the rear joint pipe by sleeves through a hose A.
[0012] Compared with the prior art, the utility model has the following beneficial effects: (1) The utility model is based on two sets of methanol collection columns and formaldehyde collection columns, which can switch to adsorb and collect exhaust gas at different powers of engines using methanol and formaldehyde as fuel, and has a wider range of applications. In addition, since methanol or formaldehyde gas is collected and adsorbed simultaneously by two sets of the same collection columns, a better methanol or formaldehyde gas collection and adsorption effect can be achieved. (2) Since the electric heating wire and the temperature switch are provided, the intake pipe can be heated at a constant temperature, which prevents water vapor from condensing into water as much as possible, thereby preventing the adverse effects on the collection and adsorption of methanol or formaldehyde gas, and provides favorable technical support for the subsequent accurate detection and analysis of methanol or formaldehyde data in the exhaust gas in the laboratory. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model.
[0015] Figure 2 This is a circuit diagram of the utility model. DETAILED DESCRIPTION
[0016] Figure 1 , 2As shown in, a methanol and formaldehyde engine exhaust sampling device includes a methanol collection column 1 (model GH-1 silica gel adsorbent tube), a formaldehyde collection column 2 (brand other, model 910 DNPH collection column finished product), a shell 3, a battery G1, a charging socket CZ1, a power switch, a solenoid valve, an electric proportional valve A2, a vacuum pump M, an electromagnetic vortex flowmeter A3, an electric heating wire RT, a temperature switch W, and a sampling tube 4; the methanol collection column 1 and the formaldehyde collection column 2 have four sets respectively, there are five solenoid valves, and the rear end and the first of the sampling tubes 4 The front end of a solenoid valve DC is connected via a thread, the rear end of the first solenoid valve DC is connected to the first end of a five-way joint pipe 5 via a pipe joint, the other four ends of the five-way joint pipe 5 are connected to the front ends of the other four solenoid valves DC1, DC2, DC3, and DC4 via pipes, and the rear ends of the other four solenoid valves DC1, DC2, DC3, and DC4 are respectively connected to a front joint pipe 6; the electric proportional valve A2 has two sets, and the exhaust pipes of the two sets of electric proportional valves A2 are connected to the first end and the second end of a three-way pipe 7 via pipe joints, respectively. The three-way pipe 7 The third end is connected to the intake pipe of the air pump M through a thread, and the intake pipe of the electromagnetic vortex flowmeter A3 is connected to the exhaust pipe of the air pump M through a pipe joint; the intake pipes of the two sets of electric proportional valves A2 are respectively connected to the first ends of a three-way joint pipe 8 through a pipe joint, and the front ends of the two three-way joint pipes 8 are respectively installed with a rear joint pipe 9 through a thread, the lower end of the five-way joint 5 and the lower end of the three-way joint pipe 8 at the lower part, and the lower end of the air pump M are installed at the lower end of the hollow shell 3 from front to back, and the front side of the sampling tube 4 and the exhaust pipe of the electromagnetic vortex flowmeter A3 are respectively connected to the first end of the three-way joint pipe 8 through a pipe joint. They are respectively located outside the front end and rear end of the shell 3; the electric heating wire RT is wound around the outside of the sampling tube 4 and the five-way joint tube 5, and the temperature switch W is installed on the outer rear end of the sampling tube 4 and the temperature sensing surface is close to the outside of the sampling tube 4 (there is a gap between the electric heating wire, and the wire connected to the temperature switch is led out to the upper outer end through the small opening of the insulation cloth, and the opening is sealed with sealant); the battery G1, the charging socket CZ1, and the power switch are installed in the component box 10 at the lower front end of the shell, and the handle of the power switch and the charging socket CZ1 jack are respectively located outside the multiple openings at the front end of the shell.
[0017] Figure 1 , 2As shown, a "Π"-shaped handle 31 is movably installed on the left and right sides of the upper end of the shell 3 to facilitate the detection personnel to carry and transfer the equipment. The solenoid valve is a normally closed valve core solenoid valve. The outer side of the electric heating wire is wrapped with high-silicon fiberglass insulation cloth (insulation function). The temperature switch W is a jump normally closed contact type temperature switch. In the four sets of methanol collection columns 1 and four sets of formaldehyde collection columns 2, every two sets of methanol collection columns 1 and formaldehyde collection columns 2 are a group, and in each group of methanol collection columns 1 and formaldehyde collection columns 2, the exhaust pipes of the front set of methanol collection columns 1 and formaldehyde collection columns 2 and the air inlet pipes of the rear set of methanol collection columns 1 and formaldehyde collection columns 2 are respectively inserted into a hose for sealing connection; in the two groups of methanol collection columns 1 and formaldehyde collection 2, the air inlet pipes of the front set of methanol collection columns 1 and formaldehyde collection columns 2 and the exhaust pipes of the rear set of methanol collection columns 1 and formaldehyde collection columns 2 are respectively inserted into a hose A for sealing connection with the rear side of one of the front joint pipes 6 and the front side of the rear joint pipe 7.
[0018] Figure 1 , 2 As shown, the positive pole of the battery G1 (the two poles and the two ends of the charging socket CZ1 are connected by wires. When the battery is out of power, the external 12V power charger plug can be inserted into the charging socket CZ1 to charge it) is connected to one end of the six power switches S, S1, S2, S3, S4, S5, one end of the temperature switch W, and the positive power input terminal 1 of the electromagnetic vortex flowmeter A3 and the electric proportional valve A2 through a wire. The other end of the six power switches S, S1, S2, S3, S4, S5 is connected to the positive power input terminal of the five electromagnetic valves DC, DC1, DC2, DC3, DC4, and the air pump M through a wire. The negative pole of the battery G1 is connected to the negative power input terminal of the five electromagnetic valves, the electromagnetic vortex flowmeter A3 and the electric proportional valve A2 (pin 2), the air pump M, and the electric heating wire RT through a wire, and the other end of the temperature switch W is connected to the positive power input terminal of the electric heating wire RT through a wire. Battery G1 is also replaced by an AC 220V power supply to DC 12V switching power supply module.
[0019] Figure 1 , 2As shown, after turning on the main power switch SK, the relevant equipment is powered on and works. When the temperature of the sampling tube 4 is lower than 50°C, the internal contacts of the temperature switch W are closed, so that the electric heating wire RT is powered on to heat the sampling tube 4; when the temperature of the sampling tube 4 is higher than 50°C, the internal contacts of the temperature switch W are open, so that the electric heating wire RT is no longer powered on to heat; through the above, it can be ensured that during sampling, the sampling tube 4 maintains a constant and high temperature, and prevents the water vapor from condensing into water as much as possible, which has an adverse effect on the collection and adsorption of methanol or formaldehyde gas. During sampling, the staff turns on the power switches of the solenoid valve DC and the vacuum pump M, and then turns on the power switches of the solenoid valve DC1 (collecting methanol in the exhaust gas discharged at a relatively low speed of an internal combustion engine that burns methanol) or DC2 (collecting methanol in the exhaust gas discharged at a relatively high speed of an internal combustion engine that burns methanol), the solenoid valve DC3 (collecting methanol in the exhaust gas discharged at a relatively low speed of an internal combustion engine that burns formaldehyde) or DC4 (collecting methanol in the exhaust gas discharged at a relatively high speed of an internal combustion engine that burns formaldehyde) as needed. Next, the testing personnel insert the front end of the sampling tube 4 into the vehicle engine exhaust pipe (a support stool or the like can be placed at the lower end of the shell, so that the staff does not need to carry equipment for sampling). After the vacuum pump M is energized, negative pressure is generated to extract the exhaust gas discharged from the vehicle engine exhaust pipe. The gas enters the first or second group of two sets of methanol collection columns 1, or the first or second group of formaldehyde collection columns 2 through the solenoid valve DC with the valve core opened, the solenoid valve DC1 or DC2, DC3, DC4 with the valve core opened, and then is discharged from the exhaust pipe of the first or second group of two sets of methanol collection columns 1, or the first or second group of formaldehyde collection columns 2, and is discharged into the vacuum pump through the exhaust pipe of the first or second set of electric proportional valve A2. The vacuum pump will discharge the automobile exhaust gas flowing into the first or second group of two sets of methanol collection columns 1, or the first or second group of formaldehyde collection columns 2 into the atmosphere after the flow rate is detected by the vortex flowmeter A3. The tail gas flows into and out of the first or second set of two methanol collection columns 1, or the first or second set of formaldehyde collection columns, and the corresponding methanol collection columns 1 or formaldehyde collection columns 2 can adsorb methanol or formaldehyde gas in the tail gas. In the present application, the inspection personnel adjust the flow rates of the two sets of electric proportional valves A2 respectively, and can control the flow rate and flow rate of the waste gas sampled into the first or second set of two methanol collection columns 1, or the first or second set of formaldehyde collection columns 2. By observing the reading of the vortex flowmeter A3, the flow rates of the two sets of electric proportional valves A2 can be combined and adjusted.Since the utility model is based on two groups of methanol collection columns and formaldehyde collection columns, it can switch to adsorb and collect the exhaust gas of engines with methanol and formaldehyde as fuel at different powers, and has a wider range of use. Moreover, since two sets of the same collection columns are used to simultaneously collect and adsorb methanol or formaldehyde gas, better methanol or formaldehyde gas collection and adsorption effects can be achieved (after one set of collection columns collects saturated gas, the other set collects). The utility model provides favorable technical support for the subsequent accurate detection and analysis of methanol or formaldehyde data in the exhaust gas in the laboratory (the sampling time of the utility model is generally about 1 minute, and the corresponding sampling column can be removed after the sampling is completed). Figure 2 Among them, the vacuum pump M has a power of 40W (it has a motor, a volute and blades. The motor is installed at the right outer end of the volute and the rotating shaft is located in the volute. The blades are tightly sleeved on the outer side of the rotating shaft and are located in the volute. The two sides of the volute are respectively provided with an inlet pipe and an exhaust pipe); the electromagnetic vortex flowmeter A3 is DN15; the electric proportional valve A2 is a finished electric proportional valve of model Q911F-16P; the battery G2 is a lithium battery of model 12V / 50Ah; the temperature switch W is a finished product of a sudden jump type 50℃ normally closed contact temperature switch of model KSD301; the electric heating wire has a power of 100W.
[0020] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the utility model.
[0021] In addition, it should be understood that although the present specification is described according to the implementation mode, the implementation mode does not only include an independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
Claims
1. An exhaust sampling device for methanol and formaldehyde engines, comprising a methanol collection column, a formaldehyde collection column, a housing, a solenoid valve, an electric proportional valve, a vacuum pump, an electromagnetic vortex flowmeter, an electric heating wire, a temperature switch, and a sampling tube, characterized in that: The methanol collection column and the formaldehyde collection column each have at least multiple sets, and there are multiple solenoid valves. One end of the sampling tube is connected to one end of the first solenoid valve, and the other end of the first solenoid valve is connected in parallel to one end of the other multiple solenoid valves, and the other ends of the other multiple solenoid valves are respectively connected to the front joint pipe; the electric proportional valve has at least two sets, the exhaust pipes of the two sets of electric proportional valves are connected in parallel to the intake pipe of the vacuum pump, and the intake pipe of the electromagnetic vortex flowmeter is connected to the exhaust pipe of the vacuum pump; the intake pipes of the two sets of electric proportional valves are respectively installed with rear joint pipes, and the solenoid valve, electric proportional valve, vacuum pump, electromagnetic vortex flowmeter, and sampling tube are installed in the shell; the electric heating wire is installed on the outside of the sampling tube, and the temperature switch is installed on the outer end of the sampling tube; one end of the temperature switch is electrically connected to one end of the power input of the electric heating wire.
2. The exhaust gas sampling device for methanol and formaldehyde engines according to claim 1, characterized in that: A handle is movably installed on the upper end of the shell.
3. The exhaust gas sampling device for methanol and formaldehyde engines according to claim 1, characterized in that: The solenoid valve is a normally closed spool solenoid valve.
4. The exhaust gas sampling device for methanol and formaldehyde engines according to claim 1, characterized in that: The outer side of the electric heating wire is wrapped with a heat-insulating cloth.
5. The exhaust gas sampling device for methanol and formaldehyde engines according to claim 1, characterized in that: The temperature switch is a snap-action normally closed contact type temperature switch.
6. The exhaust gas sampling device for methanol and formaldehyde engines according to claim 1, characterized in that: Among the multiple sets of methanol collection columns and multiple sets of formaldehyde collection columns, every two sets of methanol collection columns and formaldehyde collection columns form a group. In each group of methanol collection columns and formaldehyde collection columns, the exhaust pipes of the front set of methanol collection columns and formaldehyde collection columns and the air inlet pipes of the rear set of methanol collection columns and formaldehyde collection columns are respectively connected by flexible pipes; in two sets of methanol collection columns and formaldehyde collection columns, the air inlet pipes of the front set of methanol collection columns and formaldehyde collection columns and the exhaust pipes of the rear set of methanol collection columns and formaldehyde collection columns are respectively connected to the rear side of one of the front joint pipes and the front side of the rear joint pipe by a flexible pipe A.