CN114164016A - Non-condensable gas recovery purifier - Google Patents

Abstract

The invention relates to the technical field of pyrolysis, and discloses a non-condensable gas recovery and purification device which comprises a first tank body, a second tank body, a water ring vacuum pump and gas equipment, wherein the first tank body is connected with the second tank body through a pipeline; the first tank body is provided with 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 is provided with 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 formed in the top of the second tank body; the water ring vacuum pump is provided with a gas inlet, a gas outlet and a liquid inlet, the gas inlet is connected with the first gas outlet through a pipeline, the gas outlet is connected with the second gas inlet through a pipeline, and the liquid inlet is connected with the liquid outlet through a pipeline. In the invention, the working frequency of the water ring vacuum pump is changed along with the air pressure of the non-condensable gas, so that the pressure in the second tank body is changed, the pressure of the non-condensable gas entering the second tank body is effectively changed, and the discharge rate of the non-condensable gas is controlled.

Description

Non-condensable gas recovery purifier

Technical Field

The invention relates to the technical field of pyrolysis, in particular to a non-condensable gas recycling and purifying device.

Background

The recycling mode of the waste plastics comprises chemical recycling, and among the chemical recycling modes, pyrolysis is the waste plastics chemical recycling mode with the most industrial application value; the waste plastics can be made into high-quality liquid fuel oil, non-condensable gas and powdered carbon residue after pyrolysis treatment.

The waste plastics can generate non-condensable gas in the pyrolysis process, and the non-condensable gas can be used by gas equipment for further recycling.

However, in the process of pyrolysis of waste plastics, the raw material components, the water content, and the temperature increase rate cannot be stabilized, and therefore, the rate of generation of non-condensable gas fluctuates, and is high or low, and sometimes is not constant. For this, there are three main ways of exhausting in the prior art, as follows:

first, through the fire retardant device and the duct and into the furnace for combustion.

Secondly, the non-condensable gas is extracted through a vacuum pump and directly supplied to gas-using equipment.

Thirdly, water is filled or drained into the gas receiving tank through the water pump so as to control the volume of gas in the gas receiving tank, and therefore the exhaust rate of the gas receiving tank is controlled, and the exhaust rate is kept stable.

Among them, the former two methods have unstable discharge rate of non-condensable gas, which is inconvenient for the operation of gas-using equipment, and the third method can control the discharge rate of non-condensable gas, but the whole equipment occupies a large area.

Disclosure of Invention

The purpose of the invention is: the non-condensable gas recovery and purification device has small occupied area and can control the discharge rate of the non-condensable gas.

In order to achieve the aim, the invention provides a non-condensable gas recovery and purification device, which comprises a first tank body, a second tank body, a water ring vacuum pump and gas equipment, wherein the first tank body is connected with the second tank body; the first tank body is provided with a first air inlet and a first air outlet, and the first air inlet is used for receiving non-condensable gas formed by pyrolysis; the second tank body is provided with 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 formed in the top of the second tank body; the water ring vacuum pump is provided with a gas inlet, a gas outlet and a liquid inlet, the gas inlet is connected with the first gas outlet through a pipeline, the gas outlet is connected with the second gas inlet through a pipeline, and the liquid inlet is connected with the liquid outlet through a pipeline; and the second air outlet is connected with air using equipment through a pipeline.

Furthermore, a branch is arranged on a pipeline between the gas using equipment and the second gas outlet and connected into the first tank body; the non-condensable gas recovery and purification device further comprises a first valve body arranged on the branch.

Further, the device also comprises 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 preset value, the first valve body is opened; when the pressure value of the first pressure sensor is higher than a first preset value, the first valve body is closed.

Furthermore, a gas flow channel is arranged in the first tank body, and the first gas inlet and the first gas outlet are respectively positioned at two ends of the gas flow channel; the non-condensable gas recovery and purification device also comprises a filter assembly arranged in the gas flow channel.

Further, the filter assembly includes an adsorbent packing and an alkaline solution.

Further, the device also comprises a second pressure sensor arranged in the second tank body; the number of the gas utilization equipment is two, and the two gas utilization equipment are connected in parallel through a pipeline; when the pressure value of the second pressure sensor is lower than a second preset value, one of the gas-using devices is started; when the pressure value of the second pressure sensor is higher than a second preset value, both the gas-using devices are opened.

Further, the device also comprises a base; the first tank body, the second tank body and the water ring vacuum pump are all arranged on the base.

Further, the air-using device further comprises a pressure regulating valve arranged on a pipeline between the second air outlet and the air-using equipment.

Further, the gas-using device further comprises a flow meter arranged on a pipeline between the second gas outlet and the gas-using equipment.

Further, the first air outlet is formed in the position, close to the top, of the first tank body.

Compared with the prior art, the non-condensable gas recovery and purification device provided by the embodiment of the invention has the beneficial effects that:

1. the setting of the required liquid of the jar internal storage water ring vacuum pump of this embodiment and second, the operating frequency of water ring vacuum pump changes operating frequency along with the atmospheric pressure of noncondensable gas, changes the internal pressure of second jar to change the pressure that enters into the noncondensable gas in the second jar effectively, thereby control the discharge rate of noncondensable gas.

2. Simultaneously, with the required liquid integration of water pump in the second jar internally, can reduce noncondensable gas recovery purifier's occupation of land volume effectively.

Drawings

Fig. 1 is an overall configuration diagram of a noncondensable gas recovery and purification apparatus according to an embodiment of the present invention.

In the figure, 1, a first tank body; 2. a second tank; 3. a water ring vacuum pump; 4. a gas using device; 5. branching; 6. a first valve body; 7. a first pressure sensor; 8. a second pressure sensor; 9. a pressure regulating valve; 10. a flow meter; 11. a pyrolysis unit.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

As shown in fig. 1, a noncondensable gas recovery and purification apparatus 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 body 1 is provided with a first air inlet and a first air outlet, and the first air inlet is used for receiving non-condensable gas formed by pyrolysis; the second tank body 2 is provided with a second air inlet, a second air outlet and a liquid outlet, liquid is stored at the bottom in the second tank body 2, and the second air inlet is formed in the top of the second tank body 2; the water ring vacuum pump 3 is provided with a gas inlet, a gas outlet and a liquid inlet, the gas inlet is connected with the first gas outlet through a pipeline, the gas outlet is connected with the second gas inlet through a pipeline, and the liquid inlet is connected with the liquid outlet through a pipeline; the second air outlet is connected with the gas using equipment 4 through a pipeline.

Wherein, the non-condensable gas is discharged from the pyrolysis unit 11 to the first air inlet.

Based on the scheme, the non-condensable gas generated when the waste plastics are pyrolyzed by the pyrolysis unit 11 enters the first tank body 1 through the exhaust port and the first air inlet, is buffered in the first tank body 1, then enters the water ring vacuum pump 3 through the first air outlet and the gas inlet, enters the second tank body 2 through the gas outlet and the second air inlet, and is stored in the second tank body 2; when needed, the air enters the air using device 4 through the second air outlet, and is used by the air using device 4.

Wherein, water ring vacuum pump 3 has absorbed the liquid of holding in the second jar of body 2 at the during operation, and the volume of the second jar of body 2 increases for the noncondensable gas pressure that enters into wherein becomes low. Therefore, in actual operation, the higher the pressure of the non-condensable gas is, the higher the operating frequency of the water ring vacuum pump 3 is, and the larger the amount of liquid in the second tank body 2 is sucked, so that the pressure of the non-condensable gas entering the second tank body 2 is reduced to a greater extent or increased to a lesser extent; and when the pressure of the non-condensable gas is lower, the working frequency of the water ring is lower, the amount of liquid in the second tank body 2 is smaller, and therefore the pressure of the non-condensable gas entering the second tank body 2 is reduced to a smaller degree or increased to a larger degree. Therefore, the noncondensable gas entering the second tank 2 can be maintained in a stable range, the pressure of the noncondensable gas is regulated, and when the noncondensable gas is discharged to the gas-using equipment 4, the discharge rate, that is, the gas delivery rate supplied to the gas-using equipment 4 is also stable because the pressure is stable.

Compared with the prior art, the embodiment has the following beneficial effects:

1. the setting of the required liquid of the water ring vacuum pump 3 of storage in the water ring vacuum pump 3 of this embodiment and the second jar of body 2, the operating frequency of water ring vacuum pump 3 changes operating frequency along with the atmospheric pressure of the noncondensable gas, changes the pressure in the second jar of body 2 to change the pressure that enters into the noncondensable gas in the second jar of body 2 effectively, thereby control the discharge rate of noncondensable gas.

2. Simultaneously, with the required liquid integration of water pump in the second jar of body 2, can reduce noncondensable gas recovery purifier's occupation of land volume effectively.

Further, in some embodiments, referring to fig. 1, a branch 5 is disposed on a pipeline between the gas-using device 4 and the second gas outlet, and the branch 5 is connected to the inside of the first tank 1; the non-condensable gas recovery and purification device also comprises a first valve body 6 arranged on the branch 5.

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 gas outlet and the gas inlet, the water ring vacuum pump 3 idles; to this end, when the pyrolysis unit 11 does not generate the non-condensable gas and enters the first tank 1, part of the non-condensable gas in the second tank 2 flows back to the first tank 1 again through the branch 5, and the water supply ring vacuum pump 3 works to prevent the water ring vacuum pump 3 from being damaged due to idle running.

Further, in some embodiments, referring to fig. 1, a first pressure sensor 7 is further included; the first pressure sensor 7 is arranged in the first tank body 1; when the pressure value of the first pressure sensor 7 is lower than a first preset value, the first valve body 6 is opened; when the pressure value of the first pressure sensor 7 is higher than a first predetermined value, the first valve body 6 is closed.

In this embodiment, through 7 judgement first jar of internal portions of body noncondensable gas entering of first pressure sensor, can use manpower sparingly, and judge accurately.

Further, in some embodiments, referring to fig. 1, a gas flow channel is disposed in the first tank 1, and the first gas inlet and the first gas outlet are respectively located at two ends of the gas flow channel; the non-condensable gas recovery and purification device also comprises a filter assembly arranged in the gas flow channel.

In this embodiment, the setting of filtering component can carry out prefiltering to the inside impurity of noncondensable gas, like large granule material or suspension etc. avoid these impurity to enter into in the water ring vacuum pump 3 influence the work of water ring vacuum pump 3.

Further, in some embodiments, referring to fig. 1, the filtering assembly includes an adsorbing filler and an alkaline solution to filter acidic substances and dust in the adsorbed gas, so as to ensure that the subsequent gas-using equipment 4 can combust the non-condensable gas, ensure the combustion quality, and prevent the acidic gas from combusting and polluting the environment.

Further, in some embodiments, referring to fig. 1, a second pressure sensor 8 disposed in the second tank 2 is further included; the number of the gas utilization devices 4 is two, and the two gas utilization devices 4 are connected in parallel through a pipeline; when the pressure value of the second pressure sensor 8 is lower than a second preset value, one of the gas-using devices 4 is opened; when the pressure value of the second pressure sensor 8 is higher than a second predetermined value, both the gas-using devices 4 are opened.

In this embodiment, by setting the number of the gas using devices 4 to two, it is possible to effectively prevent the situation in which the first tank 1 or the second tank 2 cannot be accommodated due to the excessive amount of the noncondensable gas. When the noncondensable gas volume is too big, the gas consumption of single gas equipment 4 has been unable with noncondensable gas volume adaptation, opens second gas equipment 4 this moment, can improve gas equipment 4's gas consumption to avoid the unable condition of capacity of first jar of body 1 or second jar of body 2.

Further, in some embodiments, please refer to fig. 1, further comprising 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 so as to further reduce the occupied area of the non-condensable gas recovery and purification device of the embodiment.

Further, in some embodiments, please refer to fig. 1, a pressure regulating valve 9 is further included in the pipeline between the second gas outlet and the gas using device 4 to further stabilize the pressure of the non-condensable gas in the pipeline.

Further, in some embodiments, referring to fig. 1, a flow meter 10 is further included in a pipeline between the second gas outlet and the gas using device 4, so as to count the discharge amount of the non-condensable gas.

Further, in some embodiments, referring to fig. 1, the first air outlet is formed at a position near the top of the first tank 1; therefore, when the non-condensable gas is close to the first gas outlet, part of attached particulate matters sink under the action of gravity, and the non-condensable gas entering the water ring vacuum pump 3 is guaranteed not to be provided with the particulate matters.

Optionally, an overflow port is arranged on the first tank 1.

Optionally, a controller is also included; the controller is respectively electrically connected with 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 so as to control the working frequency of the water ring vacuum pump 3 and the respective start and stop of the first valve body 6 and the second valve body.

Optionally, pressure gauges are arranged on the first tank body 1 and the second tank body 2.

Optionally, the bottoms of the first tank 1 and the second tank 2 are both provided with a drain port.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A noncondensable gas recovery and purification device, comprising:

a first tank having a first air inlet and a first air outlet; the first gas inlet is used for receiving non-condensable gas formed by pyrolysis;

a second tank having 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 formed in the top of the second tank body;

a water ring vacuum pump having a gas inlet, a gas outlet, and a liquid inlet; the gas inlet is connected with the first gas outlet through a pipeline, the gas outlet is connected with the second gas inlet through a pipeline, and the liquid inlet is connected with the liquid outlet through a pipeline; and

and the second air outlet is connected with the gas using equipment through a pipeline.

2. The non-condensable gas recycling and purifying device according to claim 1, wherein a branch is arranged on a pipeline between the gas using equipment and the second gas outlet, and the branch is connected into the first tank body; the non-condensable gas recovery and purification device further comprises a first valve body arranged on the branch.

3. The noncondensable gas recovery and purification device of claim 2, further comprising 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 preset value, the first valve body is opened; when the pressure value of the first pressure sensor is higher than a first preset value, the first valve body is closed.

4. The non-condensable gas recycling and purifying device according to claim 1, wherein a gas flow channel is arranged in the first tank body, and the first gas inlet and the first gas outlet are respectively arranged at two ends of the gas flow channel;

the non-condensable gas recovery and purification device also comprises a filter assembly arranged in the gas flow channel.

5. The non-condensable gas recovering and purifying device according to claim 4, wherein the filtering assembly comprises an adsorption packing and an alkaline solution.

6. The noncondensable gas recovery and purification device of claim 1, further comprising a second pressure sensor disposed in the second tank;

the number of the gas utilization equipment is two, and the two gas utilization equipment are connected in parallel through a pipeline;

when the pressure value of the second pressure sensor is lower than a second preset value, one of the gas-using devices is started; when the pressure value of the second pressure sensor is higher than a second preset value, both the gas-using devices are opened.

7. The noncondensable gas recovery and purification device of claim 1, further comprising a base; the first tank body, the second tank body and the water ring vacuum pump are all arranged on the base.

8. The non-condensable gas recovering and purifying device according to claim 1, further comprising a pressure regulating valve provided on a pipe between the second gas outlet and the gas using equipment.

9. The non-condensable gas recovering and purifying device according to claim 1, further comprising a flow meter provided on a pipeline between the second gas outlet and the gas using equipment.

10. The non-condensable gas recovering and purifying device according to claim 1, wherein the first gas outlet is formed at a position close to the top of the first tank.

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