Purification device for treating oil-containing waste gas

Abstract

The utility model discloses a purification device for treating oil-containing waste gas, which is characterized in that the purification device comprises a wet leaching tower, an alkali port basin is arranged at the bottom of the wet leaching tower, a spraying layer is arranged in the middle of the wet leaching tower, alkali liquor is filled in the alkali port basin, the spraying layer sprays the alkali liquor mist to the bottom of the wet leaching tower, and the spraying layer sprays the alkali liquor mist to the bottom of the wet leaching tower. The top of the wet leaching tower is connected with an outer exhaust funnel through an activated carbon adsorption box; the oil-containing waste gas enters the alkaline port basin through a waste gas pipeline, is washed by alkaline liquor in the alkaline port basin, continuously rises to penetrate through alkaline liquid mist, reaches the top of the wet leaching tower, is deodorized by an activated carbon adsorption box and is exhausted from an external exhaust funnel. The device is high in oil-containing waste gas purification rate, the purified flue gas can reach the national emission standard, meanwhile, the device is simple in structure and low in energy consumption, and equipment is not prone to scaling and blocking.

Description

Technical Field

[0001] The utility model relates to the technical field of organic waste gas treatment, in particular to a purification device for treating oil-containing waste gas. Background Art

[0002] During the loading, unloading, storage, blending and transportation of fuel oil products, it is necessary to introduce steam into the unloading tank or heat the fuel oil through the heating plate pipeline at the bottom of the oil tank to reduce the viscosity of the fuel oil for easy transportation. The heated fuel oil is then pumped into the fuel oil tank for storage by the feed pump. However, during the heating, blending and transportation of the fuel oil, foul-smelling oily waste gas will be generated. The oily waste gas is a mixture of fuel aerosol formed by the gasification of the fuel oil when it is heated to about 100°C and a large amount of volatile substances generated after the fuel oil undergoes thermal oxidation, thermal cracking and Milard reaction. It contains many toxic and harmful components, mainly aldehydes, ketones, hydrocarbons, fatty acids, aromatic compounds and heterocyclic compounds. If it cannot be handled in a timely and effective manner, it will pollute the atmosphere and the surrounding environment; and the waste gas contains a certain amount of foul-smelling waste gas of non-methane total hydrocarbons, which will cause coughing, chest tightness, shortness of breath and other symptoms when inhaled, affecting the health of the operators. At present, the main methods for treating this kind of organic waste gas are direct combustion. Although it can meet the emission standards, it has high energy consumption and resources cannot be recycled. The other is absorption, which has simple equipment and low investment, but low recovery rate, and the absorption liquid needs further treatment, otherwise it will cause secondary pollution. There is also a plasma technology, which uses electrostatic dust removal and gas electrostatic principles to separate diesel aerosol from the gas. At the same time, due to the ionization of the gas, other odor-producing harmful substances are oxidized into harmless substances. However, the power consumption is high, and the generation of ions will produce radiation and strong electric fields, which poses certain safety hazards and is not conducive to promotion. Utility Model Content

[0003] The utility model aims to provide a purification device for treating oily waste gas, which has a high purification rate for oily waste gas, so that the purified flue gas can meet the national emission standards. At the same time, the device has a simple structure, low energy consumption, and the equipment is not easy to scale or clog.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A purification device for treating oily waste gas comprises a wet leaching tower, wherein an alkali pool is provided at the bottom of the wet leaching tower and a spray layer is provided in the middle, wherein the alkali pool is filled with alkali solution, and the spray layer sprays alkali liquid mist toward the bottom of the tower, and the top of the wet leaching tower is connected to an external exhaust pipe via an activated carbon adsorption box; the oily waste gas enters the alkali pool through a waste gas pipeline, is washed by the alkali solution in the alkali pool, continues to rise and penetrates the alkali liquid mist, reaches the top of the wet leaching tower, and is discharged from the external exhaust pipe after being deodorized by the activated carbon adsorption box.

[0006] Preferably, a corrugated plate packing bed is further provided in the wet elution tower, and the corrugated plate packing bed is arranged on the upper side of the spray layer; the corrugated plate packing bed is provided with open-hole corrugated plate packing, and the open-hole corrugated plate packing is covered with purified alkali solution.

[0007] Preferably, the open-cell corrugated plate filler is composed of a plurality of filler units having the same geometric shape, and the filler units are composed of corrugated sheets that are parallel to each other and stacked.

[0008] Preferably, a cyclone demister is further provided between the wet leaching tower and the activated carbon adsorption box; and a first induced draft fan is provided between the external exhaust chimney and the activated carbon adsorption box.

[0009] Preferably, the spray layer is provided with three layers of spray pipes, and each layer of the spray pipes is provided with a plurality of spray ports; and a corrugated plate is also provided on the lower side of the spray layer.

[0010] Preferably, the spray layer is connected to a flushing pool via a compression pump, the flushing pool is filled with a purifier, and the compression pump passes compressed air into the purifier to make it spray out from the spray layer to form liquid mist.

[0011] Preferably, the alkali pool is connected to the flushing pool, and the alkali solution in the alkali pool is returned to the flushing pool after being treated; the purifier is NaOH and / or NaCO clear solution; and the purified alkali solution is NaOH clear solution.

[0012] Preferably, the activated carbon adsorption box is provided with 1-2 layers of granular activated carbon adsorption layers, and the thickness of the granular activated carbon adsorption layers is 100-140 mm.

[0013] Preferably, it also includes an exhaust gas pipeline, one end of which is connected to the oil storage device, and the other end of which is connected to the alkali port pool; a second induced draft fan is provided on the exhaust gas pipeline.

[0014] Preferably, a detection port is provided on the side wall of the wet elution tower, and a pressure detector and a gas detection device are provided at the detection port.

[0015] In the above technical solution, an alkaline pool is provided at the bottom of the wet leaching tower, and the oily waste gas first enters the alkaline pool for cooling, so that the volatile oil contained in the waste gas is condensed into alkaline water to prevent it from condensing on the subsequent purification device when it rises with the oily waste gas, causing equipment blockage. The purifier forms an alkaline liquid mist with certain particles and is sprayed out from the spray port, thereby forming turbulent mass transfer with the rising oily waste gas, and performing sufficient contact purification, which has a better purification effect than surface contact. After the alkaline liquid mist, the oily waste gas completes the first stage of purification and enters the corrugated plate packing bed under the guidance of the open-hole corrugated plate packing. The contact efficiency of the oily waste gas with the flue gas is several dozen to more than two hundred times that of the plane contact according to the different vertical inclination angles of the corrugated sheets, and the contact reaction area with the waste gas flow increases geometrically, thereby achieving the purpose of super-efficient purification, and the purification efficiency can reach 82%. The purified flue gas enters the cyclone demister and the activated carbon adsorption box for dehumidification and deodorization. At this time, the purification efficiency of the oily waste gas can reach more than 98% and the moisture content can be controlled within 8%, which can meet the national emission standards. At the same time, the purification device for treating oily waste gas has a simple overall structure, low energy consumption, and is not easy to scale or clog, and is easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] In the figure, 1 is a wet leaching tower; 2 is an alkali pool; 3 is a spray layer; 4 is an activated carbon adsorption box; 5 is an external exhaust pipe; 6 is a corrugated plate packing bed; 7 is an open-hole corrugated plate packing; 8 is a spray pipe; 9 is an exhaust gas pipeline; 11 is an oil storage device; 12 is a second induced draft fan; 13 is a first induced draft fan; 14 is a detection port; 15 is a cyclone demister; 16 is a compression pump; 17 is a flushing pool; 18 is a corrugated plate. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the accompanying drawings:

[0019] like Figure 1As shown, a purification device for treating oil-containing waste gas includes a wet leaching tower 1, the bottom of which is connected to a waste gas collection device and the bottom of which is connected to an activated carbon adsorption box 4. An alkali pool 2 is provided at the bottom of the wet leaching tower 1, and an alkali solution is contained in the alkali pool 2, and the alkali solution is preferably NaOH and / or NaCO clear solution. In addition, a spray layer 3 is provided in the middle of the wet leaching tower 1, and the spray layer 3 sprays alkaline liquid mist to the bottom of the wet leaching tower 1 and then enters the alkali pool 2; a corrugated plate seasoning bed 6 is also provided above the spray layer 3, and the corrugated plate filler bed 6 includes an open-pore corrugated plate filler 7, and the open-pore corrugated plate filler 7 is covered with purified alkali solution, and the purified alkali solution is NaOH clear solution. The oily waste gas enters the alkaline pool 2 through the waste gas pipeline 9. One end of the waste gas pipeline 9 is connected to the oil storage device 11 and / or the waste gas collecting device, and the other end is connected to the alkaline pool 2. Furthermore, a second induced draft fan 12 is provided on the waste gas pipeline 9. The second induced draft fan 12 extracts the oily waste gas generated in the oil storage device 11, and sends it into the alkaline pool 2 through the waste gas pipeline 9, and impact boils with the alkaline solution in the alkaline pool 2 to cool the oily waste gas, and the volatile oil contained therein condenses into the alkaline solution water. After boiling and cooling, the rising speed of the oily waste gas will decrease, and it will continue to rise along the inner wall of the wet scrubbing tower 1 and penetrate the alkaline liquid mist. In the process, it will fully contact and collide with the alkaline liquid mist sprayed from the spray layer, so that the oil fume particles in the oily waste gas drop with the water, thereby separating the oil fume particles from the airflow, thereby completing the first-stage pretreatment buffering and purification of the oily waste gas. The oily waste gas treated by the first-stage pretreatment buffer purification enters the corrugated plate packing bed 6. The wet corrugated plate packing bed 6 purifies the waste gas by means of packing absorption reaction. It changes the commonly used absorption method of the absorption tower, making the absorbent (purified alkali solution) a continuous phase and the absorbent (oily waste gas) a dispersed phase, thereby greatly reducing the mass transfer resistance, accelerating the reaction efficiency, and removing most of the oil mist in the oily waste gas, completing the second-stage purification of the oily waste gas, and the purification efficiency can reach 82%.

[0020] The top of the wet scrubbing tower 1 is connected to an external exhaust pipe 5 through an activated carbon adsorption box 4. The oily waste gas treated by the wet corrugated plate packing bed 6 reaches the top of the wet scrubbing tower 1 and is sent to the activated carbon adsorption box 4. The porous adsorption characteristics of the activated carbon adsorbent are used to further purify the flue gas. While removing the residual oil fume particles, the total non-methane odor in the oily waste gas can also be removed. At this time, the purification efficiency of the oily waste gas can reach more than 98%. The purified waste gas is deodorized by the activated carbon adsorption box 4 and then discharged from the external exhaust pipe 5. Furthermore, 1-2 layers of granular activated carbon adsorption layers are provided in the activated carbon adsorption box 4, and the thickness of the granular activated carbon adsorption layer is 100-140mm, preferably 120mm. The granular activated carbon adsorption layer with an exhibition mechanism is convenient for replacing the activated carbon adsorption filler, making the structure of the equipment simpler; a first induced draft fan 13 is also provided between the external exhaust pipe 5 and the activated carbon adsorption box 4.

[0021] In a preferred case, a cyclone demister 15 is provided between the wet scrubbing tower 1 and the activated carbon adsorption box 4. The cyclone demister 15 can control the speed of the exhaust gas and simultaneously perform efficient centrifugal dehydration on the purified flue gas. The moisture content of the purified exhaust gas after demisting and dehydration can be controlled within 8%, which is convenient for subsequent activated carbon adsorption.

[0022] In a preferred case, the spray layer 3 is connected to the flushing water pool 17 through a compression pump 16, and the flushing water pool 17 is filled with a purifier, which is NaOH and / or NaCO clear solution; the spray layer 3 is provided with several layers of spray pipes 8, preferably three layers, and each layer of spray pipes 8 is provided with several spray ports; the purifier in the flushing water pool 17 is extracted and pumped by the compression pump 16 and sprayed out from the spray port. During the process, the compression pump 16 will introduce compressed air into the purifier, which makes the purifier atomized under high pressure when it is sprayed out from the spray port to form multiple annular alkaline liquid mist solid columns with a certain particle size, so that it can have good and sufficient contact with the oil-containing waste gas to form turbulent mass transfer, which has a better purification effect on the oil-containing waste gas.

[0023] In a preferred case, a corrugated plate 18 is also provided on the lower side of the spray layer 3, and the corrugated plate 18 guides the rising direction of the rising oily waste gas, and at the same time performs preliminary treatment on the oily waste gas, and performs initial contact and absorption reaction with the alkali solution on the corrugated plate 18. At the same time, the spray layer has a flushing effect on the corrugated plate 18, which can effectively prevent it from being blocked and affecting the purification efficiency. Furthermore, the alkali port pool 2 is connected to the flushing water pool 17, and the alkali solution in the alkali port pool 2 is returned to the flushing water pool 17 after oil separation and purification, and can be recycled.

[0024] In a preferred case, the perforated corrugated plate filler 7 is composed of many filler units with the same geometric shape, and the filler units are composed of parallel and superimposed corrugated sheets. The contact efficiency of the oily waste gas with the flue gas is several dozen to more than two hundred times that of the plane contact, depending on the vertical inclination of the corrugated sheets, and the contact reaction area with the waste gas flow increases geometrically, thereby achieving the purpose of super-efficient purification. At the same time, the corrugated sheets also have the characteristics of good corrosion resistance and wear resistance, regular channels, and low gas resistance.

[0025] In another preferred case, a detection port 14 is provided on the side wall of the wet scrubbing tower 1, and a pressure detector and a gas detection device are provided at the detection port 14, so as to observe the purification situation in the wet scrubbing tower 1 at any time, and detect the pressure and other components of the oily waste gas, so as to facilitate the replacement of the alkali solution in the alkali port pool 2.

[0026] In the above implementation scheme, the oil-containing waste gas first enters the alkali port pool to fully contact with the alkali solution, cools the oil-containing waste gas, and condenses the volatile oil in the waste gas into the alkali solution water. Then, the initially treated oil-containing waste gas continues to rise and is guided through the corrugated plate. Then, it fully contacts with the alkali solution sprayed from the spray port to form turbulent mass transfer, making the contact more thorough and sufficient. After passing through the alkali solution mist, it reaches the corrugated plate seasoning bed for further purification. After that, it enters the activated carbon adsorption box for dehumidification in the cyclone demister to remove odor, and can be discharged from the exhaust pipe.

[0027] This embodiment is only an illustration of the concept and implementation of the utility model, and does not limit it. Under the concept of the utility model, technical solutions that have not been substantially changed are still within the scope of protection.

Claims

1. A purification device for treating oily waste gas, characterized in that: It comprises a wet leaching tower, wherein an alkali port pool is provided at the bottom of the wet leaching tower and a spray layer is provided in the middle, wherein the spray layer sprays alkaline liquid mist to the bottom of the tower, wherein the alkali port pool is filled with alkali solution; a corrugated plate is also provided at the lower side of the spray layer, and a corrugated plate packing bed is provided at the upper side of the spray layer, wherein the corrugated plate packing bed is provided with an open-hole corrugated plate packing, wherein the open-hole corrugated plate packing is composed of a plurality of packing units having the same geometric shape, wherein the packing units are composed of corrugated sheets which are parallel to each other and superimposed, and the open-hole corrugated plate packing is covered with purified alkali solution; the top of the wet leaching tower is connected to an external exhaust pipe through an activated carbon adsorption box, and a cyclone demister is provided between the wet leaching tower and the activated carbon adsorption box; it also comprises an exhaust gas pipeline, wherein one end of the exhaust gas pipeline is connected to an oil storage device, and the other end of the exhaust gas pipeline is connected to the alkali port pool.

2. The purification device for treating oily waste gas according to claim 1, characterized in that: A first induced draft fan is provided between the outer exhaust cylinder and the activated carbon adsorption box.

3. The purification device for treating oily waste gas according to claim 2, characterized in that: The spray layer is provided with three layers of spray pipes, and each layer of the spray pipes is provided with a plurality of spray ports.

4. The purification device for treating oily waste gas according to claim 3, characterized in that: The spray layer is connected to a flushing pool through a compression pump, and the flushing pool is filled with a purifier. The compression pump passes compressed air into the purifier to make it spray out from the spray layer to form liquid mist.

5. The purification device for treating oily waste gas according to claim 4, characterized in that: The alkali pool is connected to the flushing pool, and the alkali solution in the alkali pool is returned to the flushing pool after being treated; the purifier is NaOH and / or NaCO clear solution; and the purified alkali solution is NaOH clear solution.

6. The purification device for treating oily waste gas according to claim 1 or 5, characterized in that: The activated carbon adsorption box is provided with 1-2 layers of granular activated carbon adsorption layers, and the thickness of the granular activated carbon adsorption layers is 100-140 mm.

7. The purification device for treating oily waste gas according to claim 1, characterized in that: The exhaust gas pipeline is provided with a second induced draft fan.

8. The purification device for treating oily waste gas according to claim 1, characterized in that: A detection port is also provided on the side wall of the wet leaching tower, and a pressure detector and a gas detection device are provided at the detection port.

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