Petrochemical tail gas purification treatment device

Abstract

This invention discloses a petrochemical tail gas purification and treatment device, including a tail gas exhaust pipe connected to a gas guide pipe. An ignition device and a blowing device are installed within the gas guide pipe. A spray device is connected to the gas guide pipe, and the spray device is connected to a heat exchanger and a filter tank. An exhaust valve is provided between the heat exchanger and the filter tank. The heat exchanger is also connected to a filter device, and the filter tank is connected to a water storage tank. Both the water storage tank and the heat exchanger are connected to the spray device. This invention features an ignition device and a blowing device to facilitate the combustion of tail gas and ensure combustion safety; a spray device, filter tank, and water storage tank for purifying water; a heat exchanger and filter device for purifying tail gas; and a water storage tank and heat exchanger connected to the spray device for easy recycling of purified air and water, thus reducing costs.

Description

Technical Field

[0001] This invention relates to the field of industrial exhaust gas purification technology, and in particular to a petrochemical exhaust gas purification and treatment device. Background Technology

[0002] Petrochemical exhaust gases contain carbon dioxide, sulfur dioxide, nitrogen oxides, and hydrofluorocarbons. The common treatment method is to combine dust removal and purification of the exhaust gases as a whole. This results in a complex structure and high equipment cost. In addition, the space formed by the exhaust gas treatment section is small, which can easily lead to the exhaust gases being discharged outdoors before they are completely purified, resulting in low purification efficiency. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a petrochemical exhaust gas purification and treatment device that can purify multiple components of exhaust gas and circulate and purify exhaust gas when the purification does not meet the standards.

[0004] The technical solution of the present invention is as follows:

[0005] A petrochemical tail gas purification and treatment device includes a tail gas exhaust pipe, a gas guide pipe connected to the outlet end of the tail gas exhaust pipe, an ignition device on one side of the gas guide pipe inlet end and a blower on the other side, a spray device connected to the outlet end of the gas guide pipe, a heat exchanger connected to one side of the spray device and a filter tank connected to the other side, an exhaust valve connected between the heat exchanger and the filter tank; the filter device connected to the outlet end of the heat exchanger, a water storage tank connected to the outlet end of the filter tank, and both the water storage tank and the outlet end of the heat exchanger are connected to the spray device.

[0006] The above structure includes a gas duct equipped with an ignition device and a blower. The exhaust gas is first ignited, burning off oily organic molecules and some flammable harmful gases (such as butadiene) carried within it. The blower quickly directs the exhaust gas towards the outlet of the duct, preventing backfire into the chemical equipment and helping to extinguish the flame, thus improving production safety. A spray system uses water mist to remove impurities from the combusted exhaust gas. The water carrying impurities collects and flows into a filter tank. Most of the gas in the spray system is first discharged into a heat exchanger, with a small portion entering the filter tank and then being drawn back into the heat exchanger via an exhaust valve. The gas discharged from the heat exchanger is then filtered to remove residual particles and sulfur-containing waste. If the purified gas contains excessive levels of hydrofluorocarbons (HFCs), it is promptly returned to the spray system. The adsorption properties of HFCs are used to circulate and remove impurities from the exhaust gas, thereby neutralizing and reducing the HFC content. Similarly, the exhaust gas in the water tank is also circulated and purified by the spray system, saving production costs.

[0007] To simplify the structure and facilitate installation, the ignition device preferably includes an electronic igniter with a rod extending into the gas duct. The extended end of the electronic igniter is fitted with a flame-retardant sleeve fixed to the inner wall of the gas duct.

[0008] To facilitate rapid gas blowing and prevent flame backfire, the blowing device preferably includes an air inlet pipe connected to a fan. The outlet end of the air inlet pipe is connected to two air inlet branch pipes, which are symmetrically inserted into the air guide pipe. The insertion end of the air inlet branch pipe is obliquely upward, and the angle between the air outlet end of the air inlet branch pipe and the inner wall of the air guide pipe is 30°. At the same time, the air outlet end of the air inlet branch pipe is lower than the insertion end of the electronic igniter.

[0009] In order to fully remove impurity particles from the combustion gas and facilitate diversion processing, the spraying device preferably includes a gas storage tank with an atomizing nozzle inside, an air extraction valve at the upper part of the gas storage tank, and a diversion pipe connected to the lower part.

[0010] To facilitate the discharge of filtered water and the separation and discharge of sediment, preferably, one side of the filter tank is connected to the drain pipe as the water inlet. A filter plate is vertically installed inside the filter tank, which divides the inner cavity of the filter tank into a first water chamber connected to the drain pipe and a second water chamber connected to the water storage tank. A water passage hole is provided at the upper part of the filter plate. A waste discharge valve is connected to the bottom of the filter tank, and a spiral impeller connected to the power motor is horizontally installed in the first water chamber at the position corresponding to the waste discharge valve.

[0011] To facilitate the full discharge of the settled water, preferably, a water pump is also connected to the outside of the filter tank. The inlet pipe of the water pump extends into the middle of the first water chamber, and the outlet pipe of the water pump is connected to the water storage tank. A dosing machine is connected to one side of the water storage tank, and a water pump is connected to the other side. The outlet of the water pump is connected to the atomizing nozzle.

[0012] To reduce the activity of gas particles in the exhaust gas and fully filter impurities, preferably, one end of the heat exchanger is provided with an air inlet pipe connected to an exhaust valve, one side of the air inlet pipe is connected to an exhaust valve, and the other end of the heat exchanger is connected to an air outlet pipe. The filtration device includes a mechanical filter and an activated carbon filter connected in sequence to the air outlet end of the air outlet pipe. The air outlet end of the activated carbon filter is connected to one end of a three-way valve. The other two ends of the three-way valve are connected to an exhaust pipe at one end and a return air pump at the other end. The air outlet end of the return air pump is connected to an atomizing nozzle.

[0013] To facilitate observation of the exhaust gas combustion state, the gas guide pipe is preferably made of quartz glass.

[0014] To prevent impurities from leaking out of the water, it is preferable to provide a filter screen in the water passage hole.

[0015] To facilitate monitoring of gas purification and timely control of recycling, preferably, a gas concentration detector is also connected between the activated carbon filter and the three-way valve. The gas concentration detector and the reflux pump are both connected to the PLC controller.

[0016] Beneficial effects: The present invention provides an ignition device and a blowing device to facilitate the combustion of exhaust gas and ensure combustion safety; it provides a spray device, a filter tank and a water storage tank to purify water, and a heat exchanger and a filter device to purify exhaust gas; the water storage tank and the heat exchanger are both connected to the spray device, which facilitates the recycling of purified air and water and can reduce costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the installation structure of the electronic igniter and the intake manifold. Detailed Implementation

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Depend on Figure 1 and Figure 2 As shown, the present invention includes an exhaust pipe 1, with a quartz glass guide pipe 11 connected to the exhaust end of the exhaust pipe 1. An ignition device is provided on one side of the air inlet end of the guide pipe 11, and a blower is provided on the other side. A spray device is connected to the exhaust end of the guide pipe 11. A heat exchanger 4 is connected to one side of the spray device, and a filter tank 5 is connected to the other side. An exhaust valve 40 is connected between the heat exchanger 4 and the filter tank 5. A filter device is connected to the exhaust end of the heat exchanger 4, and a water storage tank 6 is connected to the water outlet end of the filter tank 5. Both the water storage tank 6 and the discharge end of the heat exchanger 4 are connected to the spray device.

[0021] Specifically, the ignition device includes an electronic igniter 10, on which a rod portion 101 extends into the gas duct 11, and the extended end of the electronic igniter 10 is fitted with a flame-retardant sleeve 12 fixed to the inner wall of the gas duct 11.

[0022] The blowing device includes an air inlet pipe 13 connected to a fan (not shown). The outlet end of the air inlet pipe 13 is connected to two air inlet branch pipes 131. The two air inlet branch pipes 131 are symmetrically inserted into the air guide pipe 11. The insertion end of the air inlet branch pipe 131 is set obliquely upward, and the angle between the air outlet end of the air inlet branch pipe 131 and the inner wall of the air guide pipe 11 is 30°. At the same time, the air outlet end of the air inlet branch pipe 131 is lower than the insertion end of the electronic igniter 10.

[0023] The spraying device includes an air storage tank 2 with an atomizing nozzle 20 inside, an air extraction valve 21 at the upper part of the air storage tank 2, and a drainage pipe 22 connected to the lower part.

[0024] One side of the filter tank 5 is connected to the diversion pipe 22 as the water inlet. A filter plate 50 is vertically installed inside the filter tank 5, which divides the inner cavity of the filter tank 5 into a first water chamber 51 connected to the diversion pipe 22 and a second water chamber 52 connected to the water storage tank 6. A water passage hole 501 is provided on the upper part of the filter plate 50, and a filter screen 57 is provided in the water passage hole 501. A waste discharge valve 53 is connected to the bottom of the filter tank 5. A spiral impeller 54 connected to the power motor 55 is horizontally installed in the first water chamber 51 at the position corresponding to the waste discharge valve 53. A water pump 56 is also connected to the outside of the filter tank 5. The water inlet pipe of the water pump 56 extends into the middle of the first water chamber 51, and the water outlet pipe of the water pump 56 is connected to the water storage tank 6. A dosing machine 61 is connected to one side of the water storage tank 6, and a water pump 62 is connected to the other side. The water outlet of the water pump 62 is connected to the atomizing nozzle 20.

[0025] One end of the heat exchanger 4 is provided with an air inlet pipe 41 connected to the air extraction valve 21. One side of the air inlet pipe 41 is connected to the exhaust valve 40. The other end of the heat exchanger 4 is connected to an air outlet pipe 42. The filtration device includes a mechanical filter 43 and an activated carbon filter 44 connected in sequence to the air outlet end of the air outlet pipe 42. The air outlet end of the activated carbon filter 44 is connected to one end of a three-way valve 45. The other two ends of the three-way valve 45 are connected to an exhaust pipe 46 at one end and a return air extraction pump 47 at the other end. The air outlet end of the return air extraction pump 47 is connected to the atomizing nozzle 20.

[0026] A gas concentration detector 48 is also connected between the activated carbon filter 44 and the three-way valve 45. The gas concentration detector 48 and the reflux pump 47 are both connected to the PLC controller.

[0027] The method of using this invention is as follows:

[0028] like Figures 1 to 2As shown, during use, the exhaust gas is discharged into the duct pipe 11 through the exhaust pipe 1. At this time, the electronic igniter 10 is turned on to ignite the exhaust gas. Since the exhaust gas is output under directional pressure, it will not cause flame flashback. Before the end of chemical production, when the exhaust gas volume is reduced and the exhaust pressure is insufficient, the fan is turned on to blow air in through the duct pipe 11 and the intake branch pipe 131, which drives the exhaust gas to be discharged. Since the insertion end of the intake branch pipe 131 is set at an angle upward, and the air outlet of the intake branch pipe 131 is... The angle between the end and the inner wall of the air duct 11 is 30°. The air outlets of the two air inlet branches 131 flow back in the air duct 11 to form a cyclone. Since the cyclone does not rotate in place, it will not form a gas backflow vortex, which can prevent flame flashback. In addition, the air outlet of the air inlet branch 131 is lower than the extension end of the electronic igniter 10, and the air blowing position is lower than the flame point, so there is no tendency for flame flashback. At the same time, it can also assist in extinguishing the flame at the end to ensure the safety of exhaust gas combustion.

[0029] The exhaust pipe 11 is made of quartz glass, which is not only resistant to high temperatures but also makes it easy to observe the combustion status of the exhaust gas.

[0030] The exhaust gas after combustion is free of entrained oil and organic molecules, as well as some flammable and harmful gases (such as butadiene), forming a black gas. This black gas enters the storage tank 2 through the gas guide pipe 11, and then water is injected into the atomizing nozzle 20 to form a water mist. The water mist mixes with the black gas, carrying out larger particles and adsorbing water-soluble gas molecules. The mixture gathers at the bottom of the storage tank 2 and flows into the drainage pipe 22. After the gas is sprayed and the black color is removed, it is discharged through the exhaust valve 21 into the intake pipe 41 and enters the heat exchanger 4. At the same time, some of the gas in the storage tank 2 also enters the filter tank 5 through the drainage pipe 22. In the filter tank 5, the gas is in continuous contact with the water. In order to ensure the gas pressure in the filter tank 5 and to ensure the filtration effect of the water, the exhaust valve 40 needs to be opened to draw the gas in the filter tank 5 into the intake pipe 41 and into the heat exchanger 4.

[0031] The gas entering the heat exchanger 4 has its temperature reduced, thus decreasing the activity of the gas molecules. After being discharged through the outlet pipe 42, it is filtered sequentially through a mechanical filter 43 and an activated carbon filter 44. The mechanical filter 43 filters and retains suspended matter in the incoming gas, while the activated carbon filter 44 intercepts and adsorbs organic matter in the gas, adsorbs oxidizing gas molecules, and further decolorizes the gas to ensure the clarity of the outgoing gas. If the content of hydrofluorocarbons in the filtered gas is found to be within acceptable limits by the gas concentration detector 48, it is discharged into the atmosphere through the exhaust pipe 46.

[0032] Meanwhile, the water flowing into the filter tank 5 first flows into the first water chamber 51 and begins to accumulate and settle. The liquid level rises and flows out through the filter screen 57 at the water passage hole 501. Because the water carries a large number of impurity particles when it flows in, it will form a turbulent state in the accumulated water. That is, the water at the bottom always contains a large number of impurities. Even with the filter screen 57, it will be quickly covered and lose its filtering effect. Therefore, after the water reaches a certain height, the water flowing in no longer stirs up the impurities at the bottom. The water at the top remains calm and the impurities continue to settle. Therefore, the water passage hole 501 is set at the top of the filter plate 50. The filtered water flows into the second water chamber 52 and into the water storage tank 6. If the water storage tank 6 needs to be temporarily replenished, since the water inlet pipe of the pump 56 extends into the middle of the first water chamber 51, the pump 56 is turned on, and the water that has settled in the middle of the filter tank 5 is pumped out into the water storage tank 6.

[0033] When the sediment left in the first water chamber 51 needs to be discharged, the power motor 55 is started, which drives the spiral impeller 54 to push the sediment to the waste discharge valve 53. Opening the waste discharge valve 53 will discharge the sediment. The discharged sediment will then be separated and catalyzed for refining and processing, thereby improving the production efficiency of petrochemicals.

[0034] It should be noted that since hydrofluorocarbons are greenhouse gases and toxic, if the filtered gas fails to meet the hydrofluorocarbon content standard as detected by the gas concentration detector 48, an early warning should be issued on the PLC controller. At the same time, the reflux pump 47 should be turned on to draw the gas discharged from the exhaust pipe 46 and some atmospheric air back into the atomizing nozzle 20. Simultaneously, the dosing machine 61 should be turned on to add the relevant neutralizing agent into the water storage tank 6, which is then pumped out by the water pump 62 into the atomizing nozzle 20. In this way, the water and gas mixture re-enters the gas storage tank 2. The aforementioned procedures are repeated until the gas concentration detector 48 detects that the concentration is within acceptable limits. Then, the reflux pump 47 should be turned off, and the exhaust pipe 46 should discharge gas normally.

[0035] In addition, if it is necessary to quickly form a spiral airflow inside the air duct 11, the number of air intake branch pipes 131 can be appropriately increased and adjusted, while ensuring the sealing of the installation position to prevent unpurified gas from being discharged. The number of installations in this embodiment is not unique.

[0036] To improve operability and reduce labor intensity, the electronic igniter 10, fan, exhaust valve 21, exhaust valve 40, waste discharge valve 53, power motor 55, water pump 56, dosing machine 61 and water pump 62 provided in this application should also be connected to the PLC controller. Since this embodiment only involves the use of the PLC controller and does not involve its program control, the connection between each component and the PLC controller will not be described in detail here.

Claims

1. A petrochemical tail gas purification and treatment device, comprising a tail gas exhaust pipe (1), characterized in that: A guide pipe (11) is connected to the outlet end of the exhaust pipe (1). An ignition device is provided on one side of the inlet end of the guide pipe (11), and a blower is provided on the other side. A spray device is connected to the outlet end of the guide pipe (11). A heat exchanger (4) is connected to one side of the spray device, and a filter tank (5) is connected to the other side. An exhaust valve (40) is connected between the heat exchanger (4) and the filter tank (5). A filter device is connected to the outlet end of the heat exchanger (4), and a water storage tank (6) is connected to the outlet end of the filter tank (5). The outlet ends of the water storage tank (6) and the heat exchanger (4) are both connected to the spray device. The spraying device includes a gas storage tank (2) with an atomizing nozzle (20) inside, an air extraction valve (21) is provided at the upper part of the gas storage tank (2), and a drain pipe (22) is connected to the lower part. The filter tank (5) is connected to the drain pipe (22) on one side as the water inlet. A filter plate (50) is vertically installed inside the filter tank (5). The filter plate (50) divides the inner cavity of the filter tank (5) into a first water cavity (51) connected to the drain pipe (22) and a second water cavity (52) connected to the water storage tank (6). A water passage hole (501) is provided on the upper part of the filter plate (50). A waste discharge valve (53) is connected to the bottom of the filter tank (5). A spiral impeller (54) connected to the power motor (55) is horizontally installed in the first water cavity (51) at the position corresponding to the waste discharge valve (53). A water pump (56) is also connected to the outside of the filter tank (5). The water inlet pipe of the water pump (56) extends into the middle of the first water chamber (51). The water outlet pipe of the water pump (56) is connected to the water storage tank (6). A dosing machine (61) is connected to one side of the water storage tank (6), and a water pump (62) is connected to the other side. The water outlet of the water pump (62) is connected to the atomizing nozzle (20). The ignition device includes an electronic igniter (10), on which a rod (101) is provided that extends into the gas duct (11), and the extended end of the electronic igniter (10) is fitted with a flame-retardant sleeve (12) fixed on the inner wall of the gas duct (11). The blowing device includes an air inlet pipe (13) connected to a fan. The outlet end of the air inlet pipe (13) is connected to two air inlet branches (131). The two air inlet branches (131) are symmetrically inserted into the air guide pipe (11). The insertion end of the air inlet branch pipe (131) is set obliquely upward, and the angle between the air outlet end of the air inlet branch pipe (131) and the inner wall of the air guide pipe (11) is 30°. At the same time, the air outlet end of the air inlet branch pipe (131) is lower than the insertion end of the electronic igniter (10). One end of the heat exchanger (4) is provided with an air inlet pipe (41) connected to the air extraction valve (21). One side of the air inlet pipe (41) is connected to the exhaust valve (40). The other end of the heat exchanger (4) is connected to an air outlet pipe (42). The filtration device includes a mechanical filter (43) and an activated carbon filter (44) connected in sequence to the air outlet end of the air outlet pipe (42). The air outlet end of the activated carbon filter (44) is connected to one end of a three-way valve (45). The other two ends of the three-way valve (45) are connected to an exhaust pipe (46) at one end and a return air pump (47) at the other end. The air outlet end of the return air pump (47) is connected to an atomizing nozzle (20).

2. The petrochemical tail gas purification and treatment device as described in claim 1, characterized in that: The air duct (11) is made of quartz glass.

3. The petrochemical tail gas purification and treatment device as described in claim 1, characterized in that: A filter screen (57) is provided in the water passage hole (501).

4. The petrochemical tail gas purification and treatment device as described in claim 1, characterized in that: A gas concentration detector (48) is also connected between the activated carbon filter (44) and the three-way valve (45). The gas concentration detector (48) and the reflux pump (47) are both connected to the PLC controller.

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