A non-condensable gas recovery and purification device

Abstract

The present invention relates to the technical field of pyrolysis, and discloses a non-condensable gas recovery and purification device, which includes a first tank body, a second tank body, a water-ring vacuum pump and a gas-using device; the first tank body has a first air inlet and a first air outlet, and the first air inlet is used for receiving the non-condensable gas formed by pyrolysis; the second tank body has a second air inlet, a second air outlet and a liquid outlet, and a liquid is stored at the bottom in the second tank body, and the second air inlet is opened at the top of the second tank body; the water-ring vacuum pump has a gas inlet, a gas outlet and a liquid inlet, the gas inlet is connected to the first air outlet through a pipeline, the gas outlet is connected to the second air inlet through a pipeline, and the liquid inlet and the liquid outlet are connected through a pipeline. In the present invention, the working frequency of the water-ring vacuum pump changes with the air pressure of the non-condensable gas, changes the pressure in the second tank body, effectively changes the pressure of the non-condensable gas entering the second tank body, and controls the discharge rate of the non-condensable gas.

Description

Technical Field

[0001] The present invention relates to the technical field of pyrolysis, and in particular to a non-condensable gas recovery and purification device. Background Art

[0002] The recycling methods of waste plastics include chemical recycling. Among the chemical recycling methods, pyrolysis is the most industrially applicable chemical recycling method for waste plastics. After pyrolysis treatment, waste plastics can become high-quality liquid fuel oil, non-condensable gas and powdered carbon residue.

[0003] During the pyrolysis of waste plastics, non-condensable gas is generated, which can be used by gas-consuming equipment for further recovery treatment.

[0004] However, during the pyrolysis of waste plastics, due to the unstable raw material composition, moisture content and heating rate, the generation rate of non-condensable gas will fluctuate, sometimes high, sometimes low, sometimes present and sometimes absent. In this regard, there are mainly three existing exhaust methods, as follows:

[0005] First, it enters the furnace for combustion through a flame arrester device and a pipeline.

[0006] Second, the non-condensable gas is extracted by a vacuum pump and directly supplied to the gas-consuming equipment.

[0007] Third, water is injected into or drained from the gas collection tank by a water pump to control the gas volume in the gas collection tank, thereby controlling the exhaust rate of the gas collection tank so that the exhaust rate remains stable.

[0008] Among them, the non-condensable gas emission rates of the first two methods are unstable, which is not convenient for the operation of the gas-consuming equipment. Although the third method can control the non-condensable gas emission rate, the overall equipment occupies a large area. Summary of the Invention

[0009] The object of the present invention is to provide a non-condensable gas recovery and purification device that occupies a small area and can control the non-condensable gas emission rate.

[0010] To achieve the above object, the present invention provides a non-condensable gas recovery and purification device, which includes a first tank body, a second tank body, a water-ring vacuum pump and a gas-using device; the first tank body has a first air inlet and a first air outlet, and the first air inlet is used to receive the non-condensable gas formed by pyrolysis; the second tank body has a second air inlet, a second air outlet and a liquid outlet, and a liquid is stored at the bottom of the second tank body, and the second air inlet is opened at the top of the second tank body; the water-ring vacuum pump has a gas inlet, a gas outlet and a liquid inlet, the gas inlet is connected to the first air outlet through a pipeline, the gas outlet is connected to the second air inlet through a pipeline, and the liquid inlet is connected to the liquid outlet through a pipeline; the second air outlet is connected to the gas-using device through a pipeline.

[0011] Further, a branch is provided on the pipeline between the gas-using device and the second air outlet, and the branch is connected to the inside of the first tank body; the non-condensable gas recovery and purification device further includes a first valve body provided on the branch.

[0012] Further, it further includes a first pressure sensor; the first pressure sensor is arranged inside the first tank body; when the pressure value of the first pressure sensor is lower than a first predetermined value, the first valve body opens; when the pressure value of the first pressure sensor is higher than the first predetermined value, the first valve body closes.

[0013] Further, a gas flow channel is arranged inside the first tank body, and the first air inlet and the first air outlet are respectively located at both ends of the gas flow channel; the non-condensable gas recovery and purification device further includes a filter assembly arranged inside the gas flow channel.

[0014] Further, the filter assembly includes an adsorption filler and an alkaline solution.

[0015] Further, it further includes a second pressure sensor arranged inside the second tank body; the number of the gas-using devices is two, and the two gas-using devices are connected in parallel through a pipeline; when the pressure value of the second pressure sensor is lower than a second predetermined value, one of the gas-using devices opens; when the pressure value of the second pressure sensor is higher than the second predetermined value, both of the gas-using devices open.

[0016] Further, it further includes a base; the first tank body, the second tank body and the water-ring vacuum pump are all arranged on the base.

[0017] Further, it further includes a pressure regulating valve arranged on the pipeline between the second air outlet and the gas-using device.

[0018] Further, it further includes a flow meter arranged on the pipeline between the second air outlet and the gas-using device.

[0019] Further, the first air outlet is opened at a position of the first tank body close to the top.

[0020] Compared with the prior art, the non-condensable gas recovery and purification device according to the embodiment of the present invention has the following beneficial effects:

[0021] 1. With the water ring vacuum pump in this embodiment and the arrangement of storing the liquid required by the water ring vacuum pump in the second tank body, the working frequency of the water ring vacuum pump changes with the air pressure of the non-condensable gas, changing the pressure in the second tank body, thereby effectively changing the pressure of the non-condensable gas entering the second tank body, and thus controlling the emission rate of the non-condensable gas.

[0022] 2. At the same time, integrating the liquid required by the water pump in the second tank body can effectively reduce the occupied volume of the non-condensable gas recovery and purification device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is the overall structure diagram of the non-condensable gas recovery and purification device according to the embodiment of the present invention.

[0024] In the figure, 1. First tank body; 2. Second tank body; 3. Water ring vacuum pump; 4. Gas-using equipment; 5. Branch; 6. First valve body; 7. First pressure sensor; 8. Second pressure sensor; 9. Pressure regulating valve; 10. Flowmeter; 11. Pyrolysis unit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following combines the drawings and embodiments to further describe in detail the specific embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0026] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0027] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0028] In the present invention, unless otherwise clearly defined and limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0030] As Figure 1 shown, a non-condensable gas recovery and purification device according to a preferred embodiment of the present invention includes a first tank 1, a second tank 2, a water ring vacuum pump 3, and a gas-using device 4; the first tank 1 has a first air inlet and a first air outlet, and the first air inlet is used for receiving the non-condensable gas formed by pyrolysis; the second tank 2 has a second air inlet, a second air outlet, and a liquid outlet, a liquid is stored at the bottom inside the second tank 2, and the second air inlet is opened at the top of the second tank 2; the water ring vacuum pump 3 has a gas inlet, a gas outlet, and a liquid inlet, the gas inlet is connected to the first air outlet through a pipeline, the gas outlet is connected to the second air inlet through a pipeline, and the liquid inlet is connected to the liquid outlet through a pipeline; the second air outlet is connected to the gas-using device 4 through a pipeline.

[0031] Among them, the non-condensable gas is discharged from the pyrolysis unit 11 to the first air inlet.

[0032] Based on the above solution, the non-condensable gas generated when the pyrolysis unit 11 pyrolyzes waste plastics will enter the first tank 1 through the exhaust port and the first air inlet. After being buffered in the first tank 1, it enters the water ring vacuum pump 3 through the first air outlet and the gas inlet, and then enters the second tank 2 through the gas outlet and the second air inlet and is stored therein; when needed, it enters the gas-using device 4 through the second air outlet for use by the gas-using device 4.

[0033] Among them, when the water ring vacuum pump 3 is working, it sucks the liquid contained in the second tank 2, and the volume of the second tank 2 increases, causing the pressure of the non-condensable gas entering it to decrease. Therefore, during actual operation, the greater the pressure of the non-condensable gas, the higher the working frequency of the water ring vacuum pump 3, and the greater the amount of liquid sucked from the second tank 2, so that the pressure of the non-condensable gas entering the second tank 2 is reduced to a greater extent or increased to a smaller extent; while when the pressure of the non-condensable gas is smaller, the working frequency of the water ring is lower, and the amount of liquid sucked from the second tank 2 is smaller, so that the pressure of the non-condensable gas entering the second tank 2 is reduced to a smaller extent or increased to a greater extent. Therefore, the non-condensable gas entering the second tank 2 can be kept within a stable range, regulating the air pressure of the non-condensable gas. When discharged to the gas-using equipment 4, due to the relatively stable pressure, the discharge rate, that is, the gas delivery rate supplied to the gas-using equipment 4, is also relatively stable.

[0034] Compared with the prior art, this embodiment has the following beneficial effects:

[0035] 1. With the water ring vacuum pump 3 in this embodiment and the setting of storing the liquid required by the water ring vacuum pump 3 in the second tank 2, the working frequency of the water ring vacuum pump 3 changes with the air pressure of the non-condensable gas, changing the pressure in the second tank 2, thereby effectively changing the pressure of the non-condensable gas entering the second tank 2, and thus controlling the discharge rate of the non-condensable gas.

[0036] 2. At the same time, integrating the liquid required by the water pump in the second tank 2 can effectively reduce the floor area of the non-condensable gas recovery and purification device.

[0037] Further, in some embodiments, please refer to Figure 1 , a branch 5 is provided on the pipeline between the gas-using equipment 4 and the second air outlet, and the branch 5 is connected to the first tank 1; the non-condensable gas recovery and purification device further includes a first valve body 6 provided on the branch 5.

[0038] This embodiment can prevent the water ring vacuum pump 3 from idling. If no non-condensable gas enters the water ring vacuum pump 3 from the first air outlet and the gas inlet, the water ring vacuum pump 3 will idle; in this regard, when the pyrolysis unit 11 does not generate non-condensable gas and enter the first tank 1, some of the non-condensable gas in the second tank 2 flows back to the first tank 1 through the branch 5 for the water ring vacuum pump 3 to work, avoiding damage caused by the idling of the water ring vacuum pump 3.

[0039] Further, in some embodiments, please refer to Figure 1, further including a first pressure sensor 7; the first pressure sensor 7 is disposed inside the first tank body 1; when the pressure value of the first pressure sensor 7 is lower than a first predetermined value, the first valve body 6 is opened; when the pressure value of the first pressure sensor 7 is higher than the first predetermined value, the first valve body 6 is closed.

[0040] In this embodiment, by using the first pressure sensor 7 to judge whether non-condensable gas enters the inside of the first tank body 1, manpower can be saved and the judgment is accurate.

[0041] Further, in some embodiments, please refer to Figure 1 , a gas flow channel is provided inside the first tank body 1, and the first air inlet and the first air outlet are respectively located at two ends of the gas flow channel; the non-condensable gas recovery and purification device further includes a filtering component disposed inside the gas flow channel.

[0042] In this embodiment, the setting of the filtering component can preliminarily filter impurities inside the non-condensable gas, such as large particulate matters or suspensions, etc., to prevent these impurities from entering the water ring vacuum pump 3 and affecting the operation of the water ring vacuum pump 3.

[0043] Further, in some embodiments, please refer to Figure 1 , the filtering component includes an adsorption filler and an alkaline solution to filter and absorb acidic substances and dust in the gas, ensuring that the subsequent gas-using equipment 4 can burn these non-condensable gases, guaranteeing the combustion quality and preventing environmental pollution caused by the combustion of acidic gases.

[0044] Further, in some embodiments, please refer to Figure 1 , further including a second pressure sensor 8 disposed inside the second tank body 2; the number of the gas-using equipment 4 is two, and the two gas-using equipment 4 are connected in parallel through pipelines; when the pressure value of the second pressure sensor 8 is lower than a second predetermined value, one of the gas-using equipment 4 is opened; when the pressure value of the second pressure sensor 8 is higher than the second predetermined value, both of the two gas-using equipment 4 are opened.

[0045] In this embodiment, by setting the number of the gas-using equipment 4 to two, the situation that the first tank body 1 or the second tank body 2 cannot accommodate due to excessive non-condensable gas can be effectively prevented. When the amount of non-condensable gas is too large, the gas consumption of a single gas-using equipment 4 is no longer suitable for the amount of non-condensable gas. At this time, when the second gas-using equipment 4 is opened, the gas consumption of the gas-using equipment 4 can be increased, thereby avoiding the situation that the first tank body 1 or the second tank body 2 cannot hold the gas.

[0046] Further, in some embodiments, please refer to Figure 1, and further includes a base; the first tank body 1, the second tank body 2, and the water ring vacuum pump 3 are all arranged on the base to further reduce the floor area of the non-condensable gas recovery and purification device of this embodiment.

[0047] Further, in some embodiments, please refer to Figure 1 , and further includes a pressure regulating valve 9 provided on the pipeline between the second air outlet and the gas-using device 4 to further stabilize the air pressure of the non-condensable gas in the pipeline.

[0048] Further, in some embodiments, please refer to Figure 1 , and further includes a flow meter 10 provided on the pipeline between the second air outlet and the gas-using device 4 to facilitate the statistics of the discharge amount of the non-condensable gas.

[0049] Further, in some embodiments, please refer to Figure 1 , the first air outlet is opened at a position near the top of the first tank body 1; thus, when the non-condensable gas is near the first air outlet, some of the attached particulate matter will sink under the action of gravity, ensuring that the non-condensable gas entering the water ring vacuum pump 3 does not carry particulate matter.

[0050] Optionally, the first tank body 1 is provided with an overflow port.

[0051] Optionally, it further includes a controller; the controller is electrically connected to the water ring vacuum pump 3, the first valve body 6, the first pressure sensor 7, the second valve body, and the second pressure sensor 8 respectively to control the working frequency of the water ring vacuum pump 3 and the start and stop of the first valve body 6 and the second valve body respectively.

[0052] Optionally, pressure gauges are provided on both the first tank body 1 and the second tank body 2.

[0053] Optionally, drain ports are opened at the bottoms of both the first tank body 1 and the second tank body 2.

[0054] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0055] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A non-condensable gas recovery and purification device, characterized in that Comprising: A first tank body, which has a first air inlet and a first air outlet; The first air inlet is used to receive the non-condensable gas formed by pyrolysis. A gas flow channel is provided in the first tank body. The first air inlet and the first air outlet are respectively located at both ends of the gas flow channel. The non-condensable gas recovery and purification device further includes a filtering component provided in the gas flow channel; A second tank body, which has a second air inlet, a second air outlet and a liquid outlet; liquid is stored at the bottom in the second tank body, and the second air inlet is opened at the top of the second tank body; A water ring vacuum pump, which has a gas inlet, a gas outlet and a liquid inlet; the gas inlet is connected to the first air outlet through a pipeline, the gas outlet is connected to the second air inlet through a pipeline, and the liquid inlet is connected to the liquid outlet through a pipeline; the water ring vacuum pump is used to suck the liquid contained in the second tank body; And A gas-using device, the second air outlet is connected to the gas-using device through a pipeline, and there is a branch on the pipeline between the gas-using device and the second air outlet, and the branch is connected into the first tank body; the non-condensable gas recovery and purification device further includes a first valve body provided on the branch.

2. The non-condensable gas recovery and purification device according to claim 1, wherein It further includes a first pressure sensor; The first pressure sensor is arranged in the first tank body; when the pressure value of the first pressure sensor is lower than a first predetermined value, the first valve body opens; when the pressure value of the first pressure sensor is higher than the first predetermined value, the first valve body closes.

3. The non-condensable gas recovery and purification device according to claim 1, wherein The filtering component includes adsorption packing and an alkaline solution.

4. The non-condensable gas recovery and purification device according to claim 1, characterized in that, It further includes a second pressure sensor arranged in the second tank body; The number of the gas-using devices is two, and the two gas-using devices are connected in parallel through a pipeline; When the pressure value of the second pressure sensor is lower than a second predetermined value, one of the gas-using devices opens; when the pressure value of the second pressure sensor is higher than the second predetermined value, both of the gas-using devices open.

5. The non-condensable gas recovery and purification device according to claim 1, characterized in that, It further includes a base; the first tank body, the second tank body and the water ring vacuum pump are all arranged on the base.

6. The non-condensable gas recovery and purification device according to claim 1, characterized in that, It further includes a pressure regulating valve arranged on the pipeline between the second air outlet and the gas-using device.

7. The non-condensable gas recovery and purification device according to claim 1, wherein, It further includes a flowmeter arranged on the pipeline between the second air outlet and the gas-using device.

8. The non-condensable gas recovery and purification device according to claim 1, wherein, The first air outlet is opened at a position near the top of the first tank body.

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