System device for recovery treatment of extraction waste gas

Abstract

The utility model provides a system device for recycling extraction waste gas, which comprises an inorganic gas adsorption device, a water washing device and an activated carbon adsorption device which are sequentially connected in series along the flowing direction of the extraction waste gas, the activated carbon adsorption device is respectively provided with an adsorption inlet, an adsorption outlet, a desorption inlet, a desorption outlet, a drying inlet and a drying outlet; the method is characterized in that a drying outlet of the activated carbon adsorption device is divided into two paths, one path is connected with an inlet of the exhaust tower, and the other path is connected with an inlet of the water washing device, so that standing treatment can be added between two-step treatment of water vapor desorption and drying, and after water vapor desorption is completed, the water vapor can be separated from the water washing device. And only the valve between the drying outlet and the inlet of the washing device is opened, so that gas overflowing from the activated carbon adsorption device directly enters the washing device and is subjected to activated carbon adsorption treatment again, the organic matter recovery rate is increased, the dual effects of pressure relief and cooling of the activated carbon adsorption device can be achieved, and subsequent drying can be effectively carried out conveniently.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the extraction waste gas recycling processing technical field, specifically relates to a kind of system device of extraction waste gas recycling processing. BACKGROUND

[0002] VOC refers to volatile organic compounds, many kinds, wide source, difficult to manage, high one-time investment and operating cost, basically no recycling value, and it is more difficult to purify, separate and recycle for complex organic waste gas.

[0003] VOC pollution prevention and control is divided into two aspects, source control and end treatment comprehensive prevention and control method. The implementable scheme of source control is few, mainly using advanced technology, improving conversion, realizing efficient, centralized collection of waste gas, reducing emission etc. End treatment technology is mainly recycling technology and destruction technology. Recycling technology is mainly through physical method, changing temperature, pressure or using selective adsorbent and selective permeation membrane etc. to absorb, filter, separate the discharged VOC, then handle and resource utilization, including condensation method, absorption method, membrane separation method etc. Destruction technology is mainly through chemical reaction or biochemical reaction by heat, light, catalyst or microorganism etc. to decompose and convert the discharged VOC into other non-toxic harmless substances, including thermal incineration method, catalytic combustion method, biodegradation method, photocatalytic explanation method etc.

[0004] In the hydrometallurgical process, extraction operation is often involved, due to the characteristics of good sealing and high temperature of extraction tank in extraction process, and the existence of acid, alkali, material and organic matter etc. in extraction tank, the volatile is large, such gas has influence on employee's occupational health and atmospheric environment, cannot be discharged at will, and needs to be treated.

[0005] In summary, a kind of system device of extraction waste gas recycling processing needs to be developed, which can not only make the treated extraction waste gas meet the emission standard, but also recycle organic components in extraction waste gas. Utility model content

[0006] In view of the deficiencies in the prior art, the utility model provides a kind of system device of extraction waste gas recycling processing, and the drying outlet of active carbon adsorption device is divided into two ways, one is connected with the inlet of exhaust tower, and the other is connected with the inlet of water washing device, so that static treatment can be added between water vapor desorption and drying two-step processing, after water vapor desorption is completed, only the valve between drying outlet and the inlet of water washing device is opened, so that the gas overflowed from active carbon adsorption device directly enters water washing device, and active carbon adsorption treatment is carried out again, the organic matter recovery rate is improved, and the active carbon adsorption device can also be unloaded and cooled, so that subsequent drying can be effectively carried out.

[0007] To achieve this purpose, the utility model adopts the following technical scheme:

[0008] The utility model provides a system device of extraction waste gas recycling treatment, including inorganic gas adsorption device, water washing device, activated carbon adsorption device along the extraction waste gas flow direction, inorganic gas adsorption device, water washing device, activated carbon adsorption device are connected in proper order, the activated carbon adsorption device sets up adsorption entrance, adsorption exit, desorption entrance, desorption exit, drying entrance, drying exit respectively, the adsorption entrance is connected with water washing device, the adsorption exit is connected with the inlet of exhaust tower, is used for discharging after the activated carbon adsorption of extraction waste gas, water vapor is linked with desorption entrance, and the desorption exit is connected with condenser, oil water separator in proper order, drying gas is linked with drying entrance, and the drying exit is divided into two roads, one road is connected with the inlet of exhaust tower, and the other road is connected with the inlet of water washing device.

[0009] In the prior art, the drying outlet of the activated carbon adsorption device is only connected with the inlet of the exhaust tower, and the dried gas is directly discharged, that is, the activated carbon adsorption device only involves the periodic treatment of adsorption, desorption and drying in sequence. However, on the one hand, during the water vapor desorption treatment, especially in the later stage of multiple cycles of granular activated carbon, the desorption of organic matter cannot be completely achieved, and part of the organic matter will still enter the exhaust tower and be directly discharged during the drying treatment, which not only reduces the recovery rate of organic matter, but also has the risk of environmental protection violation; on the other hand, the pressure and temperature of water vapor are relatively high, and after the activated carbon adsorption device completes the water vapor desorption treatment, the pressure and temperature inside the activated carbon adsorption device are relatively high, and during the initial drying stage, the drying gas needs higher pressure to enter the activated carbon adsorption device, and the pipeline between the drying outlet and the inlet of the exhaust tower bears high pressure and temperature, which has a safety risk.

[0010] Therefore, the system device of extraction waste gas recycling treatment provided by the utility model focuses on dividing the drying outlet of the activated carbon adsorption device into two roads, one road is connected with the inlet of the exhaust tower, and the other road is connected with the inlet of the water washing device, so that a standing treatment can be added between the water vapor desorption and the drying treatment, after the water vapor desorption is completed, only the valve between the drying outlet and the inlet of the water washing device is opened, so that the gas overflowing from the activated carbon adsorption device directly enters the water washing device and is reprocessed by the activated carbon adsorption, which improves the recovery rate of organic matter and also plays a dual role of pressure relief and temperature reduction of the activated carbon adsorption device, facilitating the effective drying in the subsequent process.

[0011] It should be noted that the VOC detection device is arranged at the drying outlet, that is, the gas discharged through the drying outlet is subjected to VOC detection before being divided into two paths to determine whether the VOC content of the discharged gas meets the standard; in the later period of multiple circulation use of the granular activated carbon, through the static treatment added before water vapor desorption and drying, it can be found in time whether the adsorption capacity of the activated carbon is invalid or the desorption is complete, so as to determine whether the activated carbon needs to be replaced, and to avoid the emission of gas with excessive VOC content during the drying treatment as much as possible.

[0012] It should be noted that the drying outlet is additionally provided with a pipeline connected with the inlet of the water washing device instead of the inlet of the activated carbon adsorption device, because the ideal temperature of activated carbon adsorption is below 40 DEG C, and the water washing device does not have strict requirements on the internal temperature, so that the higher temperature gas overflowed from the activated carbon adsorption device is first introduced into the water washing device, and then introduced into the activated carbon adsorption device for organic matter adsorption, which can reduce the influence on the activated carbon adsorption.

[0013] As a preferred technical scheme of the present application, the inorganic gas adsorption device comprises a caustic washing tower.

[0014] As a preferred technical scheme of the present application, the inorganic gas adsorption device comprises a first-stage caustic washing tower and a second-stage caustic washing tower connected in series.

[0015] As a preferred technical scheme of the present application, the water washing device comprises a water washing tower.

[0016] As a preferred technical scheme of the present application, the activated carbon adsorption device comprises at least two activated carbon adsorption tanks connected in parallel.

[0017] As a preferred technical scheme of the present application, the activated carbon adsorption device comprises four activated carbon adsorption tanks connected in parallel, which is used to realize 3 uses and 1 standby in actual application.

[0018] As a preferred technical scheme of the present application, an air extraction fan is arranged at the inlet of the inorganic gas adsorption device.

[0019] As a preferred technical scheme of the present application, a drying fan is arranged between the drying gas and the drying inlet.

[0020] As a preferred technical scheme of the present application, a dry filter is arranged between the water washing device and the activated carbon adsorption device.

[0021] As a preferred technical scheme of the present application, the system device for recovering and treating the extraction waste gas further comprises a water cooler, which is used to cool the water separated by the oil-water separator and provide the condenser as a cold source.

[0022] Compared with the prior art, the system device for extraction waste gas recovery treatment has the beneficial effects that

[0023] The utility model provides a kind of system device for extraction waste gas recovery treatment, active carbon adsorption device's drying outlet is divided into two ways, one way is connected with the inlet of exhaust tower, another way is connected with the inlet of water washing device, so that between water vapor desorption and drying two-step processing, stationary processing can be additionally provided, after water vapor desorption is completed, just open the valve between drying outlet and the inlet of water washing device, so that the gas overflowed by active carbon adsorption device directly enters water washing device, re-performs active carbon adsorption processing, improves organic matter recovery rate, can also play the double role of pressure relief and temperature reduction of active carbon adsorption device, facilitate the effective performance of subsequent drying. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the structure diagram of system device for extraction waste gas recovery treatment described in embodiment 1 of the utility model;

[0025] Wherein, 1-extraction tank;2-extraction fan;3-first alkali washing tower;4-second alkali washing tower;5-water washing tower;6-active carbon adsorption tank;7-exhaust tower;8-condenser;9-oil-water separator;10-drying fan. DETAILED DESCRIPTION

[0026] In order to make the technical scheme, object and advantage of the utility model more clear, the utility model is further described in detail below by specific example and in conjunction with drawings. It should be understood that the specific embodiment described herein is only used to illustrate and explain the utility model, and is not used to limit the utility model.

[0027] In the description of the utility model, it should be pointed out that the orientation or position relationship indicated by terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and is not indicative or implied that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, so it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicative or implied relative importance.

[0028] In the description of the utility model, it needs to explain, unless another explicit provision and limitation, the term "installation", "link", "connection" should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be the communication inside two elements.For the electric and communication field, can be wired connection, also can be wireless connection.For the ordinary skill in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0029] Embodiment 1

[0030] The embodiment provides a kind of extraction waste gas recovery processing system device, as shown in Figure 1 Along the flow direction of extraction waste gas, it includes primary alkali washing tower 3, secondary alkali washing tower 4, water washing tower 5, four parallel active carbon adsorption tank 6 in turn, and each active carbon adsorption tank 6 is respectively provided with adsorption inlet, adsorption outlet, desorption inlet, desorption outlet, drying inlet and drying outlet;The adsorption inlet is connected with the water washing tower 5, and the adsorption outlet is connected with the exhaust tower 7, for discharging extraction waste gas after active carbon adsorption;Water vapor is communicated with the desorption inlet, and the desorption outlet is sequentially connected with condenser 8 and oil-water separator 9;Drying gas is communicated with the drying inlet, and the drying outlet is divided into two ways, one is connected with the inlet of the exhaust tower 7, and the other is connected with the inlet of the water washing tower 5;

[0031] Among them, four parallel active carbon adsorption tank 6 is used to realize 3 use 1 spare in actual application;

[0032] Extraction fan 2 is arranged at the inlet of primary alkali washing tower 3, for sending extraction waste gas in extraction tank 1 to primary alkali washing tower 3 to carry out primary alkali washing;

[0033] Drying fan 10 is arranged between drying gas and the drying inlet;

[0034] Dry filter (not shown in the figure) is arranged between the water washing tower 5 and the active carbon adsorption tank 6.

[0035] It needs to be explained that the pipeline in the extraction waste gas recovery processing system device described in embodiment 1 is provided with on-off valve for control.

[0036] An extraction waste gas recovery processing method using the extraction waste gas recovery processing system device described in embodiment 1, comprising the following contents:

[0037] The material composition in the extraction tank: organic components include light white oil and P507 extractant; inorganic acid and alkali include 6N dilute sulfuric acid, 5.5N dilute hydrochloric acid and 31% liquid alkali; the pressure of water vapor is 0.4-0.6 MPa;

[0038] The operation sequence of each activated carbon adsorption tank is as follows: adsorption time: 579 min; desorption time: 70 min; standing time: 40 min; drying time: 35 min; fully meeting the time setting of 3 uses and 1 standby;

[0039] The extraction exhaust gas in the extraction tank 1 is extracted by using the air extraction fan 2 and is sequentially sent to the first alkali washing tower 3, the second alkali washing tower 4 and the water washing tower 5 to sequentially perform first alkali washing, second alkali washing and water washing.

[0040] The adsorption inlet and the adsorption outlet of the three activated carbon adsorption tanks 6 in use are opened, and other openings are closed, so that the water-washed extraction exhaust gas is subjected to activated carbon adsorption, and the adsorbed extraction exhaust gas is discharged through the exhaust tower 7.

[0041] According to the sequence, when one of the three activated carbon adsorption tanks 6 in use reaches saturated adsorption of activated carbon, water vapor desorption treatment is needed, the desorption inlet and the desorption outlet of the activated carbon adsorption tank are opened, and other openings are closed, the saturated activated carbon is subjected to temperature rising and pressure increasing desorption by using water vapor, and the water vapor containing organic matter is introduced into the condenser 8 for condensation, the condensed liquid enters the oil-water separator 9 to realize oil-water separation, the upper oil is recovered, and the lower water is discharged as industrial water or waste water; after the water vapor desorption is completed, the valve between the drying outlet and the water washing device inlet of the activated carbon adsorption tank is opened, and other openings are closed, the corresponding activated carbon adsorption tank 6 is subjected to standing treatment, the overflow gas directly comes to the water washing tower 5 and then returns to other activated carbon adsorption tanks 6 for organic matter recovery, so as to improve the organic matter recovery rate, and the activated carbon adsorption tank 6 reaches the dual effects of pressure relief and temperature reduction, which facilitates the subsequent effective drying; after the standing is completed, the drying inlet and the drying outlet of the activated carbon adsorption tank are opened, and other openings are closed, the drying gas is introduced into the activated carbon adsorption tank 6 through the drying fan 10 to dry the activated carbon, and the preparation for reusing the activated carbon adsorption is completed, and the gas generated after drying is discharged through the exhaust tower 7.

[0042] According to the sequence, when one of the three activated carbon adsorption tanks 6 in use reaches saturated adsorption of activated carbon, water vapor desorption treatment is needed, the desorption inlet and the desorption outlet of the activated carbon adsorption tank are opened, and other openings are closed, the saturated activated carbon is subjected to temperature rising and pressure increasing desorption by using water vapor, and the water vapor containing organic matter is introduced into the condenser 8 for condensation, the condensed liquid enters the oil-water separator 9 to realize oil-water separation, the upper oil is recovered, and the lower water is discharged as industrial water or waste water; after the water vapor desorption is completed, the valve between the drying outlet and the water washing device inlet of the activated carbon adsorption tank is opened, and other openings are closed, the corresponding activated carbon adsorption tank 6 is subjected to standing treatment, the overflow gas directly comes to the water washing tower 5 and then returns to other activated carbon adsorption tanks 6 for organic matter recovery, so as to improve the organic matter recovery rate, and the activated carbon adsorption tank 6 reaches the dual effects of pressure relief and temperature reduction, which facilitates the subsequent effective drying; after the standing is completed, the drying inlet and the drying outlet of the activated carbon adsorption tank are opened, and other openings are closed, the drying gas is introduced into the activated carbon adsorption tank 6 through the drying fan 10 to dry the activated carbon, and the preparation for reusing the activated carbon adsorption is completed, and the gas generated after drying is discharged through the exhaust tower 7.

[0043] The extraction waste gas recovery treatment method using the system device for extraction waste gas recovery treatment described in Example 1 can achieve that the VOC concentration in the discharged extraction waste gas is less than 80 mg / m 3 , and the daily recovered organic oil is about 1 m 3 .

[0044] Comparative Example 1

[0045] This comparative example provides a system device for extraction waste gas recovery treatment, which is different from Example 1 only in that the drying outlet of each activated carbon adsorption tank is only one way, and the drying outlet is only connected with the inlet of the exhaust tower.

[0046] An extraction waste gas recovery treatment method using the system device for extraction waste gas recovery treatment described in Comparative Example 1, comprising the following contents:

[0047] The material composition in the extraction tank includes organic components including light white oil and P507 extractant, and inorganic acid and alkali including 6N dilute sulfuric acid, 5.5N dilute hydrochloric acid and 31% liquid alkali; the pressure of water vapor is 0.4-0.6 MPa;

[0048] The operation sequence of each activated carbon adsorption tank is as follows: adsorption time: 579 min; desorption time: 70 min; drying time: 35 min; completely meeting the time setting of 3 in 1 standby;

[0049] The extraction waste gas in the extraction tank is extracted using an air extraction fan and is sequentially sent to a primary alkali washing tower, a secondary alkali washing tower and a water washing tower, and sequentially subjected to primary alkali washing, secondary alkali washing and water washing;

[0050] The adsorption inlet and the adsorption outlet corresponding to the three activated carbon adsorption tanks in use are opened, and other openings are closed, and the water-washed extraction waste gas is subjected to activated carbon adsorption, and the adsorbed extraction waste gas is discharged through the exhaust tower;

[0051] According to the sequence, after one of the three activated carbon adsorption tanks in use reaches saturated adsorption of activated carbon, water vapor desorption treatment is needed, the desorption inlet and the desorption outlet corresponding to the activated carbon adsorption tank are opened, and other openings are closed, the saturated adsorbed activated carbon is subjected to temperature and pressure desorption by using water vapor, and the water vapor with organic matter is introduced into a condenser for condensation, the condensed liquid is introduced into an oil-water separator to realize oil-water separation, the upper oil is recovered, and the lower water is discharged as industrial water or waste water; after the water vapor desorption treatment is completed, the drying inlet and the drying outlet corresponding to the activated carbon adsorption tank are opened, and other openings are closed, drying gas is introduced into the corresponding activated carbon adsorption tank through a drying fan to dry the activated carbon, and preparation for re-activated carbon adsorption is made, and the gas generated after drying is discharged through the exhaust tower;

[0052] According to the order of sequence, after one of the three activated carbon adsorption tanks in use reaches the saturated adsorption of activated carbon, the water vapor desorption treatment needs to be carried out, the corresponding desorption inlet and desorption outlet are opened, other openings are closed, at the same time, the corresponding adsorption inlet and adsorption outlet of the standby activated carbon adsorption tank are opened, other openings are closed, namely, the standby activated carbon adsorption tank is put into use.

[0053] The extraction waste gas recovery treatment method of the system device for recovering and treating extraction waste gas according to the comparative example 1, since no standing treatment is carried out, in the early stage of multiple cycle use of the granular activated carbon, the VOC concentration in the discharged extraction waste gas is less than 80mg / m 3 However, in the later stage of multiple cycle use of the granular activated carbon, after the VOC concentration in the discharged extraction waste gas exceeds the standard, it cannot be found in time, and since no standing treatment is carried out, the average daily recovered organic oil is about 0.9m 3 Above all, the utility model provides a kind of system device for recovering and treating extraction waste gas, and the drying outlet of activated carbon adsorption device is divided into two ways, one is connected with the inlet of exhaust tower, the other is connected with the inlet of water washing device, so that standing treatment can be added between water vapor desorption and drying two-step processing, after water vapor desorption is completed, only the valve between drying outlet and the inlet of water washing device is opened, so that the gas overflowed from activated carbon adsorption device directly enters water washing device, and reactivated carbon adsorption treatment is carried out, improve organic matter recovery rate, also can play the double role of pressure relief and temperature reduction of activated carbon adsorption device, facilitate the effective implementation of subsequent drying.

[0054] The above only describes the specific implementation of the utility model, but the protection scope of the utility model is not limited to this, and the skilled person in the art should understand that any change or replacement that can be easily thought of by any person skilled in the art within the technical range disclosed by the utility model falls within the protection scope and disclosure range of the utility model.

Claims

1. A system for treating and recovering extraction waste gas, characterized in that, Along the flow direction of the extraction waste gas, the system includes an inorganic gas adsorption device, a water washing device, and an activated carbon adsorption device connected in series. The activated carbon adsorption device has an adsorption inlet, an adsorption outlet, a desorption inlet, a desorption outlet, a drying inlet, and a drying outlet. The adsorption inlet is connected to the water washing device, and the adsorption outlet is connected to an exhaust tower for discharging the extraction waste gas after activated carbon adsorption. Water vapor is connected to the desorption inlet, and the desorption outlet is connected in series with a condenser and an oil-water separator. Drying gas is connected to the drying inlet, and the drying outlet is divided into two paths: one connected to the inlet of the exhaust tower, and the other connected to the inlet of the water washing device.

2. The system apparatus for recovering and treating extraction waste gas according to claim 1, characterized in that, The inorganic gas adsorption device includes an alkaline washing tower.

3. The system apparatus for recovering and treating extraction waste gas according to claim 2, characterized in that, The inorganic gas adsorption device includes a primary alkaline scrubbing tower and a secondary alkaline scrubbing tower connected in series.

4. The system apparatus for recovering and treating extraction waste gas according to claim 1, characterized in that, The washing device includes a washing tower.

5. The system apparatus for recovering and treating extraction waste gas according to claim 1, characterized in that, The activated carbon adsorption device includes at least two activated carbon adsorption tanks connected in parallel.

6. The system apparatus for recovering and treating extraction waste gas according to claim 5, characterized in that, The activated carbon adsorption device includes four activated carbon adsorption tanks connected in parallel, which is used to achieve three in use and one in standby in practical applications.

7. The system apparatus for recovering and treating extraction waste gas according to claim 1, characterized in that, An exhaust fan is installed at the inlet of the inorganic gas adsorption device.

8. The system apparatus for recovering and treating extraction waste gas according to claim 1, characterized in that, A drying fan is installed between the drying gas and the drying inlet.

9. The system apparatus for treating extraction waste gas according to claim 1, characterized in that, A dry filter is installed between the water washing device and the activated carbon adsorption device.

10. The system apparatus for recovering and treating extraction waste gas according to claim 1, characterized in that, The system for recovering and treating extraction waste gas also includes a chiller, which cools the water obtained from the oil-water separator and provides it to the condenser as a cold source.

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