Volatile organic compound (VOC) lower liquid recovery device of high-oxygen system

Abstract

The utility model discloses a VOC (volatile organic compound) lower liquid recovery device of a high-oxygen system, which belongs to the field of coking production equipment and comprises production devices capable of generating VOC waste gas in the working production process of the high-oxygen system, each production device is provided with an air entraining channel for collecting the VOC waste gas, each air entraining channel is communicated with a VOC recovery header pipe, the VOC recovery header pipe is obliquely arranged in the air, and the VOC recovery header pipe is communicated with the production devices. The end connected with the air entraining channel is a high end, the other end is a low end, the low end leads to the VOC alkaline washing tower and the VOC treatment device, the VOC recovery header pipe is provided with a fan used for supplying air to guide and convey VOC, the bottom of the middle end of the VOC recovery header pipe is provided with a plurality of liquid discharging pipelines used for collecting waste gas condensate, and the liquid discharging pipelines are connected and gathered to a liquid discharging storage tank. The lower liquid storage tank is connected with an alkali liquor bin of the VOC alkaline washing tower, and a lower liquid conveying pump used for conveying lower liquid to the VOC alkaline washing tower is arranged in the lower liquid storage tank. The device is simple in structure, waste liquid can be effectively recycled, and the problem of liquid expansion during production is avoided.

Description

Technical Field

[0001] The utility model relates to the field of coking production equipment, in particular to a VOC lower liquid recovery device for a high oxygen system. Background Art

[0002] During the production process of the high oxygen system in the factory, mixed waste gas containing VOC will be generated. The composition of these VOC mixed waste gases is relatively complex, and they will also bring a large amount of condensed liquid. How to properly handle these VOC liquids is crucial to ensure the orderly production. The conventional treatment method is to discharge the liquids in an orderly manner. Generally, it shares a tank with the vent tank of the desulfurization process. The mixed liquid is finally discharged to the desulfurization accident tank. However, as the production continues, and the amount of VOC liquid is large, a large amount of VOC liquid needs to be discharged. This will cause the desulfurization process to often increase the liquid, seriously affecting the normal production of the desulfurization process. At the same time, there is room for recycling VOC liquids. If they are discharged directly, it will also cause a certain degree of waste. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a VOC lower liquid recovery device for a high oxygen system, which can effectively recycle the lower liquid while solving the problem of liquid swelling in the desulfurization process.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a VOC lower liquid recovery device for a high oxygen system, including a production device that will generate VOC waste gas during the production process of the high oxygen system, each production device is provided with an air inlet channel for collecting VOC waste gas, each air inlet channel is connected to a VOC recovery main pipe, the VOC recovery main pipe is arranged obliquely in the air, the end connected to the air inlet channel is the high end, and the other end is the low end, the low end leads to a VOC alkali washing tower and a VOC treatment device, a fan for supplying air to guide the transportation of VOC is provided on the VOC recovery main pipe, a plurality of lower liquid pipes for collecting waste gas condensate are provided at the bottom of the middle end of the VOC recovery main pipe, the lower liquid pipes are connected and aggregated to a lower liquid storage tank, the lower liquid storage tank is connected to the alkali liquid tank of the VOC alkali washing tower, and a lower liquid delivery pump for delivering the lower liquid to the VOC alkali washing tower is provided inside the lower liquid storage tank.

[0005] A further improvement of the technical solution of the utility model is that a liquid level meter and a pH detector are arranged inside the lower liquid storage tank.

[0006] A further improvement of the technical solution of the utility model is that the VOC treatment device is a dry quenching coke oven.

[0007] A further improvement of the technical solution of the utility model is that a saturated waste liquid treatment device is arranged on the VOC alkali washing tower.

[0008] A further improvement of the technical solution of the present utility model lies in that the main VOC recovery pipe is made of 304 stainless steel

[0009] Due to the adoption of the above technical solution, the technical progress achieved by the present utility model is as follows: By setting a relatively long VOC recovery main pipe inclined in mid-air, the complex-component VOC waste gas can be fully condensed in the air to generate condensate. At the same time, the condensate gathers downward under the action of gravity. By setting multiple downward liquid pipes leading to the downward liquid storage tank, all the VOC condensate from the VOC waste gas can be collected in the downward liquid storage tank without being discharged to the vent tank of the desulfurization process, effectively avoiding the liquid swelling accident. By setting a downward liquid transfer pump inside the downward liquid storage tank, the downward liquid can be sent to the VOC caustic scrubbing tower, effectively utilizing the alkaline property of the downward liquid as the alkaline water for spraying and washing the acidic gas in the VOC gas, reducing the waste of resources caused by direct discharge. Description of the Drawings

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings;

[0011] Figure 1 It is a schematic structural diagram of the present utility model;

[0012] Among them, 1. Production tank, 2. Overflow tank, 3. Crystallization tank, 4. Other tanks, 5. VOC caustic scrubbing tower, 6. Main VOC recovery pipe, 7. Fan, 8. Downward liquid pipe, 9. Downward liquid storage tank, 10. Downward liquid transfer pump, 11. Coke dry quenching furnace. Detailed Embodiment

[0013] The following further describes the present utility model in detail with reference to the embodiments:

[0014] As Figure 1As shown, it is a structural schematic diagram of a VOC lower liquid recovery device of a high oxygen system, including a production device that generates VOC waste gas during the working production process of the high oxygen system. In this embodiment, these specific devices that generate VOC waste gas are arranged at the production site. The production tank 1, the full flow tank 2, the crystallization tank 3 and other tanks 4 are arranged at the production site. The upper openings of the production tank 1, the full flow tank 2, the crystallization tank 3 and other tanks 4 are connected to the air induction channel, and each air induction channel is connected to the VOC recovery main pipe 6. The VOC waste gas generated in the production tank 1, the full flow tank 2, the crystallization tank 3 and other tanks 4 enters the air induction channel, and is collected and passed into the VOC recovery main pipe 6 through the air induction channel. The VOC recovery main pipe 6 is made of 304 stainless steel. The VOC recovery main pipe 6 is tilted in the air, with the end connected to the air duct as the high end and the other end as the low end. The high end is higher than the low end, that is, it is tilted from the high end to the low end. The VOC recovery main pipe 6 is provided with a fan 7 for air supply and guidance to transport VOC. After the VOC waste gas enters the VOC recovery main pipe 6, it moves from the high end to the low end under the guidance of the air blown by the fan 7. During the movement, the VOC waste gas will be pre-cooled to produce condensed liquid. The low end of the VOC waste gas recovery main pipe 6 leads to the VOC alkali washing tower 5 and the VOC treatment device. In this embodiment, the VOC treatment device is a dry quenching coke oven 11, that is, the method of treating the VOC waste gas is to firstly wash the acid and sulfur removal with alkali and then burn it for treatment. A plurality of liquid pipes 8 for collecting waste gas condensate are arranged at the bottom of the middle end of the VOC recovery main pipe 6. A liquid storage tank 9 is arranged below the VOC recovery main pipe 6. The liquid pipes 8 are connected and collected to the liquid storage tank 9. The condensate generated in the recovery main pipe 6 will flow along the plurality of liquid pipes 8 to the liquid storage tank 9 specially used for storing liquid under the action of gravity. The generated condensed liquid will not be discharged to the tank of the desulfurization vent tank, and will no longer affect the liquid swelling in the desulfurization process. The condensed liquid is alkaline. In order to reduce resource waste and effectively recycle the condensed liquid, the alkaline properties are developed. The lower liquid storage tank 9 is provided with a pH detector, a liquid level meter and a lower liquid delivery pump 10. The lower liquid storage tank 9 is connected to the alkali liquid tank of the VOC alkali washing tower 5. A valve is provided at the connection. The valve and the lower liquid delivery pump 10 are controlled by the PLC system. The PLC system constantly monitors the internal situation of the lower liquid storage tank 9 through the liquid level meter and the pH detector. When the accumulated liquid is large and the pH is greater than or equal to 9 and the alkaline condition is met, the PLC system controls the lower liquid delivery pump 10 to open and deliver the alkali washing lower liquid to the alkali liquid tank of the VOC alkali washing tower 5, and sprays it in the alkali washing tower as alkali liquid. The VOC alkali washing tower 5 is provided with a saturated waste liquid treatment device 12, including a tar residue pre-separator and other devices for treating the waste liquid after alkali washing.

[0015] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A VOC liquid recovery device for a high-oxygen system, comprising a production device that generates VOC waste gas during the operation and production process of the high-oxygen system. An air extraction channel for collecting VOC waste gas is provided on each production device, and each air extraction channel is connected and leads to a VOC recovery main pipe (6), characterized in that: The VOC recovery main pipe (6) is arranged obliquely in the air, with the end connected to the air inlet channel being the high end and the other end being the low end, the low end leading to the VOC alkali washing tower (5) and the VOC treatment device. A fan (7) for supplying air to guide and transport VOC is arranged on the VOC recovery main pipe (6). A plurality of lower liquid pipes (8) for collecting waste gas condensate are arranged at the bottom of the middle end of the VOC recovery main pipe (6). The lower liquid pipes (8) are connected and collected to a lower liquid storage tank (9). The lower liquid storage tank (9) is connected to the alkali liquid tank of the VOC alkali washing tower (5). A lower liquid delivery pump (10) for delivering the lower liquid to the VOC alkali washing tower (5) is arranged inside the lower liquid storage tank (9).

2. The VOC liquid recovery device of a high-oxygen system according to claim 1, wherein: A liquid level meter and a pH detector are arranged inside the lower liquid storage tank (9).

3. The VOC liquid recovery device of a high-oxygen system according to claim 1, characterized in that: The VOC treatment device is a dry quenching coke oven (11).

4. A VOC liquid recovery device for a high-oxygen system according to claim 1, characterized in that: The VOC alkali washing tower (5) is provided with a saturated waste liquid treatment device (12).

5. The VOC liquid recovery device of a high-oxygen system according to claim 1, characterized in that: The VOC recovery main pipe (6) is made of 304 stainless steel.

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