A non-methane total hydrocarbon generating device and a generating method

Abstract

The application relates to a non-methane total hydrocarbon generating device and a generating method. The device comprises a heating furnace body, a cracking cavity, a temperature reducing cavity, a support assembly, an atomization assembly, a first pipeline and a second pipeline. Oil liquid is introduced into the first pipeline, and inert gas is introduced into the second pipeline. The heating furnace body adopts a high-frequency induction heating furnace. The oil liquid is sprayed into the cracking cavity through the atomization assembly. The oil liquid cracking exhaust gas in the heating furnace body is discharged from the top after passing through the temperature reducing cavity. The generating method comprises the following steps: S1, preheating the cracking cavity, and controlling the temperature at 500-800 DEG C; S2, filling the cracking cavity with protective gas; S3, taking edible oil, atomizing and spraying the edible oil into the cracking cavity for cracking; S4, cooling the generated oil fume; and S5, taking the oil fume gas for detection. The device realizes the generation simulation of non-methane total hydrocarbon, realizes the atomization of the oil liquid by introducing the oil liquid and the inert gas, prevents the combustion of the generated oil mist, and simultaneously adopts the high-frequency induction furnace for heating, so that the temperature is easy to control and reaches the required temperature.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste gas, cooking fume simulation generation, in particular to a non-methane total hydrocarbon generating device and a generating method. BACKGROUND

[0002] Non-methane total hydrocarbon (NMHC) is defined as the remaining value after deducting methane from the total hydrocarbon determination result; and total hydrocarbon refers to the sum of gaseous organic matter that produces a response on a gas chromatography hydrogen flame ionization detector under specified conditions, mainly including alkane, alkene, aromatic hydrocarbon and oxygen-containing hydrocarbon components, etc. Hydrocarbon substances are mostly in liquid or solid state under normal conditions, except for methane, and have different vapor pressures according to the differences in their molecular weight and structural form, so as the non-methane total hydrocarbon as an atmospheric pollutant, it actually refers to hydrocarbon substances with C2-C12. Hydrocarbon substances have the characteristics of flammability and explosiveness, and their specific physical and chemical properties depend on the monomer composition and concentration. The environmental hazards of non-methane total hydrocarbon mainly include that it reacts with nitrogen dioxide under sunlight to generate substances containing ozone, peroxyacetyl nitrate, aldehydes and other substances known as photochemical smog, which can stimulate the eyes and mucous membranes of humans and animals, cause headaches, respiratory disorders, exacerbation of chronic respiratory diseases, abnormal lung function in children, etc. Photochemical smog can drift hundreds of kilometers with the airflow, causing damage to crops far away from the city. Photochemical smog not only affects humans and plants, but also damages buildings and significantly reduces visibility, affecting the normal travel of the public.

[0003] In the catering industry, cooking not only produces cooking fume, but also produces various alkanes, alkenes, aromatic hydrocarbons, etc. Although the two cannot be confused, they are produced at the same time and cause great pollution to the environment, so the state clearly stipulates that cooking fume and non-methane total hydrocarbon harmful gases should be purified at the same time. Therefore, the content of non-methane total hydrocarbon in the waste gas produced in the catering industry needs to be determined in order to carry out targeted purification. At present, the non-methane total hydrocarbon generating device is generally obtained by heating and volatilizing organic substances such as ethanol and n-hexane, etc. The obtained volatile gas components are few, and the deviation from the actual working condition is large in the simulation process, the test data is not accurate, and the experimental error is caused.

[0004] Therefore, a non-methane total hydrocarbon generating device capable of reducing the above-mentioned defects and simulating the generation of non-methane total hydrocarbon is needed in the laboratory. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a non-methane total hydrocarbon generating device and a generating method capable of effectively simulating the generation of non-methane total hydrocarbon.

[0006] The technical scheme adopted by the present application to solve its technical problems is: a non-methane total hydrocarbon generating device for generating oil fume for testing, comprising a heating furnace body, a cracking cavity arranged in the heating furnace body, a cooling cavity located above the cracking cavity, a support assembly arranged above the cooling cavity, an atomization assembly arranged on the support assembly and extending into the cracking cavity, a first pipeline and a second pipeline connected to the atomization assembly, oil being introduced into the first pipeline, and inert gas being introduced into the second pipeline, the heating furnace body being a high-frequency induction heating furnace, and the oil being sprayed into the cracking cavity through the atomization assembly, and the oil cracking exhaust gas in the heating furnace body being discharged from the top after being cooled by the cooling cavity.

[0007] Further specifically, the support assembly comprises a guide cylinder with two open sides, a support arranged at the top of the guide cylinder, and a limiting plate arranged outside the guide cylinder, and the atomization assembly is arranged on the support and extends into the guide cylinder.

[0008] Further specifically, two handles are arranged on the limiting plate, and the two handles are symmetrically arranged on the two sides of the guide cylinder.

[0009] Further specifically, the cracking cavity and the cooling cavity are of an integrated structure, and the cracking cavity and the cooling cavity are a cylindrical cavity with an open top, a sealing groove is arranged outside the opening of the cylindrical cavity, and a sealing ring is arranged in the sealing groove, and the limiting plate is pressed on the sealing ring to realize sealing.

[0010] Further specifically, the cracking cavity and the cooling cavity are of an integrated structure, and the cracking cavity and the cooling cavity are a cylindrical cavity with an open top, and the cylindrical cavity and the heating furnace body are of a split structure.

[0011] Further specifically, the support comprises a vertical frame fixed at the top of the guide cylinder and a horizontal frame extending to one side at the top of the vertical frame, and the atomization assembly is arranged on the horizontal frame.

[0012] Further specifically, the atomization assembly comprises a tee joint with two inlets and one outlet, the first pipeline and the second pipeline are respectively connected to the inlets of the tee joint, a penetrating pipe is connected to the outlet of the tee joint, and an atomization nozzle is arranged at the head of the penetrating pipe.

[0013] Further specifically, the inner wall of the guide cylinder is in the form of a conical surface, and the top opening of the guide cylinder is smaller than the bottom opening.

[0014] A non-methane total hydrocarbon generating method, the generating method is,

[0015] S1, preheat the cracking cavity, so that the temperature of the cracking cavity is controlled between 500-800 DEG C;

[0016] S2, fill the cracking cavity with protective gas to prevent combustion;

[0017] S3, take edible oil and spray the edible oil into the cracking cavity to make the edible oil crack to produce oil fume gas;

[0018] S4, cool the produced oil fume to make the oil fume gas temperature less than 200℃;

[0019] S5, take the oil fume gas to detect.

[0020] Further specifically, the spraying in step S3 uses the protective gas in step S2.

[0021] The present application has the advantages that: through the above structure and method, the generation simulation of non-methane total hydrocarbon can be conveniently performed, the oil liquid is atomized by the oil liquid and inert gas respectively introduced through the first pipeline and the second pipeline, the inert gas can effectively prevent the produced oil mist from burning, the high-frequency induction furnace is used for heating, the temperature can be easily controlled and the required temperature can be reached, and the time consumption is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the front view structural schematic diagram of the present application;

[0023] Figure 2 is the side view structural schematic diagram of the present application;

[0024] Figure 3 is Figure 2 is the sectional view structural schematic diagram of A-A in the present application;

[0025] Figure 4 is Figure 2 is the enlarged structural schematic diagram of B part in the present application;

[0026] Figure 5 is the top view structural schematic diagram of the present application.

[0027] In the figure: 1, heating furnace body; 2, cylindrical chamber; 3, support assembly; 4, atomization assembly; 5, first pipeline; 6, second pipeline; 21, cracking cavity; 22, cooling cavity; 31, guide cylinder; 32, support; 321, vertical frame; 322, horizontal frame; 33, limiting plate; 34, sealing ring; 41, three-way joint; 42, extension pipe; 43, atomizing nozzle; 44, control valve. DETAILED DESCRIPTION

[0028] The present application will be described in detail below in combination with the embodiments shown in the drawings. However, these embodiments do not limit the present application, and the structural, method, or functional changes made by those skilled in the art according to these embodiments are included in the protection scope of the present application.

[0029] As used herein, terms of spatial relative position such as "upper", "above", "lower", "below", etc. are used to describe the relationship of one unit or feature relative to another unit or feature as shown in the drawings for the purpose of convenience of illustration. The terms of spatial relative position can be intended to include different orientations of the device in use or in operation other than the orientation shown in the drawings. For example, if the device in the drawings is turned over, the unit described as being "below" or "under" the other unit or feature will be "above" the other unit or feature. Therefore, the exemplary term "below" can encompass both the above and below orientations. The device can be oriented in other ways (rotated 90 degrees or other orientations), and the spatially-related descriptions used herein are interpreted accordingly.

[0030] Also, it should be understood that, although the terms first, second, etc. can be used herein to describe various elements or structures, these elements or structures should not be limited by these terms. These terms are only used to distinguish one element or structure from another. For example, a first conduit can be termed a second conduit, and similarly, a second conduit can also be termed a first conduit, without departing from the scope of the present application.

[0031] As Figures 1-5 A non-methane total hydrocarbon generating device for generating oil fume gas for testing, comprising a heating furnace body 1, a cracking cavity 21 arranged in the heating furnace body 1, a cooling cavity 22 located above the cracking cavity 21, a support assembly 3 arranged above the cooling cavity 22, an atomization assembly 4 arranged on the support assembly 3 and extending into the cracking cavity 21, a first conduit 5 and a second conduit 6 connected to the atomization assembly 4, oil liquid being introduced into the first conduit 5, and inert gas being introduced into the second conduit 6, the heating furnace body 1 being a high-frequency induction heating furnace, the oil liquid being sprayed into the cracking cavity 21 through the atomization assembly 4, and the oil liquid cracking exhaust gas in the heating furnace body 1 being discharged from the top after passing through the cooling cavity 22; the heating furnace body 1 can generate a high temperature of 500-800°C as needed, the oil liquid cracking generates oil fume gas containing non-methane total hydrocarbon in the high temperature environment, and the oil fume gas is discharged upward, which can be collected for testing at this time.

[0032] Based on the above structure, a set of oil fume gas generating method is designed, and the steps of the method are as follows:

[0033] S1, preheating the cracking cavity 21, before heating, the temperature in the cracking cavity 21 needs to be raised to facilitate direct cracking of the oil liquid after entering, the temperature of the cracking cavity 21 is controlled between 500-800°C, and is adjusted in the temperature range as needed, and in the present scheme, the preferred temperature is 700±10°C.

[0034] S2, the protective gas is filled in the cracking cavity 21, the purpose is that the oil liquid does not contact with air, prevents the oil liquid from burning, the protective gas adopts inert gas, the inert gas is nitrogen, argon and the like, the oil liquid is not burned directly under the protection of the inert gas and cracking occurs.

[0035] S3, edible oil is taken and sprayed into the cracking cavity 21, so that the edible oil is cracked to produce oil fume gas, the spraying adopts inert gas, which can protect the edible oil from burning in the process of entering the cracking cavity 21 and achieve the atomization effect.

[0036] S4, the generated oil fume is cooled, the purpose of cooling is to facilitate the collection of the oil fume gas, too high temperature is easy to cause scalding and other safety accidents, the cooling makes the oil fume gas temperature less than 200 DEG C.

[0037] S5, the oil fume gas is taken for detection, the oil fume gas has alkane, olefin, aromatic hydrocarbon and the like.

[0038] In the above oil fume gas generation method, the same inert gas is used in steps S2 and S3, that is, the atomized inert gas directly enters the cracking cavity 21 for protection, and no other pipeline is used to introduce inert gas.

[0039] In order to facilitate the positioning of the atomization assembly 4, the bracket assembly 3 includes a guide cylinder 31 with two open sides, a bracket 32 arranged on the top of the guide cylinder 31 and a limiting plate 33 arranged outside the guide cylinder 31, the atomization assembly 4 is arranged on the bracket 32 and extends into the guide cylinder 31, the outer diameter of the guide cylinder 31 needs to be smaller than the cooling cavity 22 and the cracking cavity 21, a part of the guide cylinder 31 is inserted into the cooling cavity 22 and limited by the limiting plate 33, so that another part of the guide cylinder 31 is located above the cooling cavity 22, the inserted part can enter the cracking cavity 21, or only inserted into the cooling cavity 22 without entering the cracking cavity 21; for example Figure 4The support 32 shown includes a vertical support 321 fixed at the top of the guide cylinder 31 and a horizontal support 322 extending to one side at the top of the vertical support 321; the atomization assembly 4 includes a tee joint 41 with two inlets on the left and right sides and an outlet at the bottom; the first pipe 5 and the second pipe 6 are connected at the inlets of the tee joint 41, i.e. the first pipe 5 corresponds to the left inlet of the tee joint 41 and the second pipe 6 corresponds to the right inlet of the tee joint 41; the outlet of the tee joint 41 is connected with an extension pipe 42, an atomization nozzle 43 is arranged at the head of the extension pipe 42, the extension pipe 42 can extend into the cooling cavity 22 or be located above the cooling cavity 22; the tee joint 41 is fixed on the horizontal support 322 so that the two inlets are parallel to the horizontal support 322 and the outlet is perpendicular to the horizontal support 322, the extension pipe 42 only needs to extend into the guide cylinder 31, and the atomized oil liquid can enter the cracking cavity 21 along the guide cylinder 31; a control valve 44 is arranged on the tee joint 41 for controlling the amount of protective gas and oil liquid entering; the guide cylinder 31 can prevent the atomization nozzle 43 from extending into the cracking cavity 21 to cause damage due to excessive temperature; at the same time, the guide cylinder 31 can also make the oil fume discharge upward, facilitating collection; further, the inner wall of the guide cylinder 31 is a conical surface, the top opening of the guide cylinder 31 is smaller than the bottom opening, i.e. a reverse conical shape, when the atomized oil liquid adheres to the inner wall, it can facilitate the atomized oil liquid to enter the cracking cavity 21 as soon as possible, improving the effect.

[0040] The support assembly 3 and the heating furnace body 1 are designed in a split structure, which can replace the support assembly 3, and two handles are arranged on the limiting plate 33 for convenient replacement, the two handles are symmetrically arranged on both sides of the guide cylinder 31, and the operator can manually move away.

[0041] In order to improve the sealing during cracking, the oil fume cannot be discharged from the limiting plate 33, the cracking cavity 21 and the cooling cavity 22 are designed in an integrated structure, the cracking cavity 21 and the cooling cavity 22 are a cylindrical chamber 2 with a top opening, a sealing groove is arranged outside the top opening of the cylindrical chamber 2, and a sealing ring 34 is arranged in the sealing groove, and the limiting plate 33 is pressed on the sealing ring 34 to realize sealing.

[0042] The heating furnace body 1 and the cylindrical chamber 2 are designed in a split structure, i.e. the cylindrical chamber 2 can be taken out from the heating furnace body 1, since there are impurities on the inner wall of the cracking cavity 21 after cracking, only the cracking cavity 21 needs to be replaced when the heating furnace body 1 performs other work, which is convenient for operation.

[0043] In summary, the generation simulation of non-methane total hydrocarbon is realized by the cooperation of the atomization assembly 4 and the heating furnace body 1, the temperature borne by the atomization assembly 4 can be ensured not to be too high through the structural design of the support assembly 3, the service life is improved, meanwhile, the support assembly 3 is designed as a split structure, the installation and removal are facilitated, and the heating furnace body 1 can be applied to other works, the high-frequency induction furnace is used for heating, the temperature can be easily controlled and the required temperature can be reached, and the time consumption is reduced.

[0044] It should be emphasized that the above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification of the above embodiment according to the technical essence of the present application still belongs to the scope of the technical solution of the present application.

Claims

1. A non-methane total hydrocarbon generating device for generating oil fumes for testing, characterized by, The utility model relates to a kind of oil fume generation methods and devices, including a heating furnace body (1), be set in the heating furnace body (1) pyrolysis cavity (21), located the cooling cavity (22) above pyrolysis cavity (21), be set in the support assembly (3) above cooling cavity (22), be set in the support assembly (3) and inwards into one atomization component (4) in pyrolysis cavity (21), first pipeline (5) and second pipeline (6) are connected in atomization component (4) on, oil liquid is passed into in first pipeline (5), inert gas is passed into in second pipeline (6), the heating furnace body (1) uses high-frequency induction heating furnace, oil liquid is sprayed into pyrolysis cavity (21) by atomization component (4), oil liquid combustion exhaust gas in heating furnace body (1) is discharged from top after passing through cooling cavity (22); The support assembly (3) includes a guide cylinder (31) with two open sides, a support (32) disposed on the top of the guide cylinder (31), and a limiting plate (33) disposed on the outside of the guide cylinder (31), and the atomization component (4) is disposed on the support (32) and extends into the guide cylinder (31); The pyrolysis cavity (21) and the cooling cavity (22) are of an integrated structure, and the pyrolysis cavity (21) and the cooling cavity (22) are a cylindrical chamber (2) with an open top. A sealing groove is formed around the opening of the cylindrical chamber (2), and a sealing ring (34) is arranged in the sealing groove. The limiting plate (33) is pressed on the sealing ring (34) to achieve sealing. The cylindrical chamber (2) and the heating furnace body (1) are of a split structure. The inner wall of the guide cylinder (31) is in the form of a conical surface, and the top opening of the guide cylinder (31) is smaller than the bottom opening.

2. The non-methane hydrocarbon generating device according to claim 1, wherein Two handles are arranged on the limiting plate (33), and the two handles are symmetrically arranged on the two sides of the guide cylinder (31).

3. The non-methane hydrocarbon generating device according to claim 1, wherein The support (32) includes a vertical frame (321) fixed to the top of the guide cylinder (31) and a horizontal frame (322) extending to one side at the top of the vertical frame (321), and the atomization component (4) is arranged on the horizontal frame (322).

4. The non-methane hydrocarbon generating device according to claim 1, wherein The atomization component (4) includes a tee joint (41) with two inlets and one outlet. The first pipeline (5) and the second pipeline (6) are connected to the inlets of the tee joint (41), respectively. An extension pipe (42) is connected to the outlet of the tee joint (41), and an atomizing nozzle (43) is arranged at the head of the extension pipe (42).

5. A method for generating non-methane hydrocarbons based on the generating apparatus according to any one of claims 1 to 4, characterized by, The generation method comprises the following steps: S1, preheat the pyrolysis cavity (21) to control the temperature of the pyrolysis cavity (21) between 500-800℃; S2, fill the pyrolysis cavity (21) with protective gas to prevent combustion; S3, take edible oil and atomize and spray the edible oil into the pyrolysis cavity (21) to make the edible oil crack and generate oil fume gas; S4, cool the generated oil fume to make the temperature of the oil fume gas less than 200℃; S5, take the oil fume gas for detection.

6. The method for generating non-methane total hydrocarbons according to claim 5, characterized in that, In step S3, the atomization and spraying is performed using the protective gas in step S2.

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