CN211963647U - Oil gas washing dechlorination device - Google Patents
Oil gas washing dechlorination device Download PDFInfo
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- CN211963647U CN211963647U CN201922324172.5U CN201922324172U CN211963647U CN 211963647 U CN211963647 U CN 211963647U CN 201922324172 U CN201922324172 U CN 201922324172U CN 211963647 U CN211963647 U CN 211963647U
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Abstract
The utility model discloses an oil gas washing dechlorination device, which comprises a horizontal tank body, and a mixed washing cylinder, a gas phase outlet, a water dividing bag, a baffle plate and a dechlorination oil outlet which are sequentially arranged from left to right along the axis of the horizontal tank body, wherein the mixed washing cylinder is arranged on the outer wall of the left end of the horizontal tank body, the gas phase outlet is arranged at the top of the horizontal tank body, the water dividing bag is arranged at the outer side of the bottom of the horizontal tank body, and the baffle plate is arranged at the bottom of the horizontal tank body; the mixed washing cylinder is a vertical cylinder, the top of the mixed washing cylinder is provided with an oil-gas inlet and a water washing water inlet, a mixed washing element is arranged in the mixed washing cylinder, the lower end of the mixed washing cylinder is provided with a collecting box, the collecting box is provided with a cyclone separator along the circumferential direction, and the collecting box and the cyclone separator are both positioned in the horizontal tank body; and a chlorine-containing water outlet is formed in the bottom of the water diversion bag. The utility model can greatly reduce the content of chlorine and chloride in the oil gas, and effectively improve the chloride corrosion resistance and salt deposition resistance of the device; the corrosion resistance of subsequent equipment and pipelines can be improved under the condition of lower material grade.
Description
Technical Field
The utility model belongs to the petrochemical field relates to the washing desorption of corrosivity chloride in the oil gas, and specifically speaking relates to an oil gas washing dechlorination device.
Background
With the deterioration of crude oil, the content of corrosive impurities such as sulfur, nitrogen, chlorine, etc. in crude oil is significantly increased, and many corrosion problems caused during the processing have become important factors affecting the long-term safe production of the apparatus. The problems of corrosion leakage, salt deposition blockage and the like caused by chlorides generally occur in an overhead system of an atmospheric and vacuum device, a condensation cooling system of reaction effluent of a hydrogenation device, a heat exchanger behind a pre-hydrogenation reactor of a reforming device, a catalytic cracking device, a fractionating tower overhead system and an overhead system of a coking device and the like, so that the yield reduction production or shutdown treatment of the device is caused, and the problems become prominent problems influencing the long-period safe and stable operation of a refining enterprise.
HCl generated by hydrolysis or thermal decomposition in the processing process of the chlorine-containing raw oil is dissolved in condensed water at a low-temperature part to form 'hydrochloric acid', which has strong corrosivity or NH3In the presence of NH4Cl。NH4On one hand, Cl is separated out in a form of solid ammonium chloride salt in a condensation cooling system, and the system is blocked after accumulation; on the other hand, due to NH4Cl is hygroscopic and can absorb moisture from gaseous fluids, resulting in NH4Under-scale corrosion by Cl salts. The ammonium chloride salt deposition and hydrochloric acid corrosion caused by chlorine are commonly existing in main production devices such as atmospheric and vacuum distillation, catalysis, coking, hydrogenation and the like, so that failure accidents such as ammonium chloride salt blockage, perforation leakage and the like of equipment are caused, a plurality of unplanned shutdown accidents are caused, and enterprises are seriously influencedSafe production and economic benefit of industry.
At present, the common chloride corrosion protection measures at home and abroad mainly include measures of injecting a neutralizing agent, injecting a corrosion inhibitor, injecting water, improving the grade of materials and the like. The water injection on the one hand absorbs chlorine in the gas phase stream into the water to avoid the formation of ammonium chloride salts and on the other hand dissolves the ammonium chloride salts already formed into the water to avoid plugging the piping and equipment. Therefore, the concentration of liquid-phase chloride ions in the system is reduced, and the gas-phase ammonium chloride is prevented from salt deposition, which becomes the key for controlling the corrosion of the system. For the designed equipment pipeline system, due to the existence of unstable factors such as the change of processing raw materials, the change of process conditions, even the fluctuation of operating parameters and the like, the water injection quantity is insufficient, the front and back drift of the dew point position occurs, so that the capacity of the existing water injection and agent injection facilities is insufficient, and the selected material can not be well adapted to the dew point corrosion and NH (hydrogen-ammonia) of the system4Under-deposit corrosion, erosion, etc. of Cl salt. In addition, the common practice on the existing device is that the fluid injected with water is separated from water after passing through a series of heat exchangers, air coolers and separators, and the aqueous solution absorbing chlorine and dissolving ammonium chloride salt is not discharged out of the system in time, so that the material flow containing high-corrosion medium exists in the system for a long time, the probability of local concentration and bias flow in the system is increased, the risk of corrosion is increased, and the pipeline range of equipment generating corrosion is enlarged.
At present, another method for reducing the chlorine content in the field of petrochemical industry is to arrange dechlorination equipment. Chinese patent CN209093016U (a dechlorinating apparatus for stable top noncondensable gas of reforming apparatus) discloses a dechlorinating apparatus for stable top noncondensable gas of reforming apparatus, wherein the top gas phase passes through the dechlorinating apparatus, and chloride ions in the top gas are removed under the action of dechlorinating agent; chinese patent CN204918487U (an alkylate dechlorination apparatus) discloses an alkylate dechlorination apparatus, which is provided with two-stage dechlorination tanks to reduce the chlorine content in alkylate under the action of dechlorinating agent. However, dechlorination tanks tend to have a large pressure drop, which increases the energy consumption of the plant on the one hand and is not suitable for systems with lower operating pressures on the other hand.
Chinese patent CN205379839U (vortex type dechlorinating device) discloses a vortex type dechlorinating device for quickly dissolving chloride ions and performing solid-liquid separation, which can quickly remove chloride ions in silt and perform solid-liquid separation by vortex type washing, spiral stirring and secondary clear water washing. The device is mainly used for removing chloride ions in a solid phase, is different from the technology for removing chloride ions in a medium with most gas phases, and has rotating parts, so that the energy consumption of the device is increased, and the device is easy to break down.
In summary, the chloride corrosion problem existing in main production devices such as atmospheric and vacuum distillation, catalysis, coking, hydrogenation and the like at present is not completely solved, the corrosion risk cannot be completely controlled, the requirement of long-period safe and stable operation of refining enterprises cannot be met, and equipment for more effectively reducing chlorine corrosion in oil gas needs to be developed to establish a stable and controllable corrosion environment for subsequent operation.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems of untimely elimination of corrosive chlorides, large corrosion risk and high energy consumption of the device in the prior art, the utility model provides an oil gas washing dechlorinating device.
The utility model provides an oil gas washing dechlorination device, including the horizontal tank body and along the horizontal tank body axis from left to right set gradually mixed washing drum, gaseous phase export, divide water package, baffle and dechlorination oil export, mixed washing drum locates on the horizontal tank body left end outer wall, gaseous phase export locates the horizontal tank body top, the water diversion package locates the horizontal tank body bottom outside of horizontal tank body bottom, the baffle locates the horizontal tank body bottom of water diversion package low reaches; the mixed washing cylinder is a vertical cylinder, the top of the mixed washing cylinder is provided with an oil-gas inlet and a water washing water inlet, a mixed washing element is arranged in the mixed washing cylinder, the lower end of the mixed washing cylinder is provided with a collecting box, the collecting box is provided with a cyclone separator along the circumferential direction, and the collecting box and the cyclone separator are both positioned in the horizontal tank body; and a chlorine-containing water outlet is formed in the bottom of the water diversion bag.
The mixing washing element comprises an anti-impact dispersion plate and a mixing member, and the mixing member is arranged below the anti-impact dispersion plate. Scour protection dispersion board is by 2 ~ 6 layers, the oval bow-shaped metal sheet of thickness 1 ~ 10mm is made, the metal sheet is 5 ~ 45 degrees with mixed washing section of thick bamboo barrel axis installation contained angle, upper and lower two-layer metal sheet symmetrical arrangement, upper and lower two-layer metal sheet separates for 40 ~ 100mm, the equipartition is the circular port that regular triangle arranged on the last one deck scour protection dispersion board, can realize oil gas through the scour protection dispersion board, the preliminary mixing of washing water, greatly reduced oil gas simultaneously, the impact of aqueous phase to mixing component, the protection mixing component, and make oil gas, the aqueous phase evenly gets into mixing component gently.
The mixing member may be formed of a metal plate or may be formed by laying corrugated wire mesh. When the mixed component is formed by the tiling of silk screen, adopt a plurality of layers of ripple type specification 0.1 ~ 2mm silk footpath silk screen tiling to form, the crisscross 90 degrees of adjacent two-layer silk screen is arranged, and the silk screen overall height is 50 ~ 800mm, and the inside passageway that constitutes intercrossing and link up each other of silk screen. The silk screen is supported by the grid and is pressed and fixed, and the grid is fixed on the wall of the mixing and washing drum. The silk screen can be made into an integral type according to the diameter of the mixing washing cylinder and can also be made into a block type. The liquid phase continuously flows downwards along the surface of the wire mesh in a zigzag way, the gas phase flows in the channel in a crossed way, the oil gas continuously contacts with the washing water, and is fully contacted and mixed in the pore channels in the mixing element together, and the chlorine and the chloride in the oil gas are fully dissolved in the water. The silk screen type mixing member has the technological characteristics of large specific surface area value, large flux, small pressure drop, high efficiency and convenient replacement, and can be tightly contacted with the wall of the mixing washing cylinder.
The mixing component can also be made of a plurality of metal plates with the thickness of 0.1-8 mm, the included angle between each metal plate and the axis of the mixing washing cylinder is 10-60 degrees, the distance between the left and right adjacent metal plates is 1-10 mm, and the tops and the bottoms of the left and right adjacent metal plates are connected into a whole through metal laths to form a layer; the height of each layer of metal plate is 40-100 mm. Two adjacent layers of metal plates are symmetrically arranged up and down, and 2-10 layers of metal plates are overlapped together to form a channel which is communicated up and down. The metal plates are surrounded by a metal hoop, and the upper end of the hoop is turned outwards to prevent wall flow. The metal plate type mixing component is supported in the mixing washing cylinder by a support ring welded on the wall of the mixing washing cylinder, and the support ring can be a whole ring or an intermittent ring. The metal plate type mixed component has the process characteristics of impact resistance, small pressure drop, corrosion resistance, strong anti-fouling capability and high efficiency, oil and water flow downwards on the surface of the metal plate in a zigzag path, the gas phase and the liquid phase are continuously turned in the flowing process, the contact area and time of the oil and the water are increased, and chloride ions in oil gas are fully fused into water for washing.
The collecting box can be cylindrical or square barrel-shaped, cyclone separators are uniformly distributed on the collecting box along the circumferential direction of the collecting box, and the number of the cyclone separators can be 1-10.
The further improvement is that in order to better carry out liquid-liquid separation and more thoroughly separate the water washing oil and the dechlorinated oil, a liquid-liquid separation element is arranged at the bottom of the horizontal tank body between the mixing washing cylinder and the water distribution bag and close to the water distribution bag, the liquid-liquid separation element can be a screen coalescer, the screen is composed of steel wires with the wire diameter of 0.1-2 mm, the thickness of the screen is 50-500 mm, the screen coalescer has the technical characteristics of large specific surface area value, large flux, small pressure drop and high efficiency, small liquid drops of oil phase and water phase are gradually coalesced into larger liquid drops in pores in the coalescer, and continuous oil phase and water phase with obvious phase interface boundary are finally formed, because the density of the oil phase is smaller than that of the water phase, under the action of gravity, the water phase is accumulated at the lower part of the liquid phase, flows into a water dividing bag on the horizontal tank body, and flows out of the device through a chlorine-containing water outlet on the water dividing bag; the oil phase is accumulated on the upper part of the liquid phase, and can cross the baffle plate in the horizontal tank body after being accumulated to a certain height, and then flows out of the device from the dechlorination oil outlet on the horizontal tank body.
The further improvement is that in order to better remove the entrainment-shaped liquid in the gas phase, a liquid remover is arranged in front of the gas phase outlet, and the liquid remover is formed by filling a wire mesh in a round or square metal groove body with two open ends.
The utility model discloses a working process does: the chlorine-containing oil and water washing water respectively enter the mixed washing cylinder through the oil gas inlet and the water washing water inlet, after the oil and the water washing water are mixed and washed by the mixed washing element, the oil and the water washing water are fully contacted and mixed, and chlorine and chloride in the oil and gas are fully dissolved in the water. The oil phase, the water phase and the gas phase which are fully mixed enter a collecting box, enter a cyclone separator through the flow guide effect of the collecting box, and the gas phase and the liquid phase are separated in the cyclone separator. After the liquid phase separated by the cyclone separator passes through a liquid-liquid separation element (a wire mesh coalescer), the oil phase and the water phase are coalesced and further settled under the action of gravity in a settling zone separated by a baffle plate, the washing water dissolved with chloride ions and salt is discharged out of a device through a chlorine-containing water outlet on a water distribution drum, and the oil phase from which the chloride ions and the salt are removed is discharged out of the device through a dechlorination oil outlet on a horizontal tank body. The gas phase separated by the cyclone separator is further separated from liquid drops carried in the gas phase through a liquid remover, the gas phase without chloride ions passes through a gas phase outlet discharging device on the horizontal tank body, and the collected liquid drops fall into a settling zone under the action of gravity.
According to the content of chloride in oil gas and the condition of water supply, the water washing water can be purified water, demineralized water and the like.
The utility model discloses following beneficial effect has:
1) through washing and separating the oil gas containing chlorine and salt, the chlorine and chloride in the oil gas are dissolved in water, and the water in which the chlorine and chloride are dissolved is separated out, so that the content of the chlorine and chloride in the oil gas is greatly reduced, the corrosivity of the oil gas is weakened, and the chloride corrosion resistance and salt deposition resistance of the device are effectively improved;
2) a stable and controllable corrosion environment is established for a subsequent system, so that the corrosion resistance of subsequent equipment and pipelines can be improved under the condition of lower material grade;
3) the washing water is separated immediately, the load of subsequent equipment and pipelines is not increased, and the risk and the range of corrosion of the subsequent equipment and the pipelines are reduced;
4) the dispersion and washing of oil gas and the separation of oil phase and water phase are completed in the same equipment, so that the investment and the occupied area of the device are reduced;
5) all elements are static facilities, so that the faults are few, the equipment pressure drop is small, and the energy consumption is low.
Drawings
FIG. 1 is a schematic diagram of the structure of the oil gas washing dechlorination device of the present invention;
FIG. 2 is a schematic structural view of a mixing member according to the present invention;
fig. 3 is a schematic structural view of the last layer of anti-impact dispersion plate in the present invention;
FIG. 4 is a schematic view of a structure of the collecting tank and the cyclone separator.
In the figure: 1-horizontal tank body, 2-support, 3-collecting box, 4-water dividing bag, 5-chlorine-containing water outlet, 6-baffle, 7-dechlorinated oil outlet, 8-liquid removing device, 9-manhole, 10-liquid level instrument, 11-gas phase outlet, 12-liquid separation element, 13-oil gas inlet, 14-metal plate type mixing component, 15-cyclone separator, 16-washing water inlet, 17-anti-impact dispersion plate, 18-mixing washing cylinder and 19-silk screen type mixing component.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an oil gas washing dechlorination device of the present invention, which mainly includes a horizontal tank 1, a support 2, a collecting box 3, a water diversion bag 4, a chlorine-containing water outlet 5, a baffle 6, a dechlorination oil outlet 7, a liquid removal device 8, a manhole 9, a liquid level meter 10, a gas phase outlet 11, a liquid-liquid separation element 12, an oil gas inlet 13, a metal plate type mixing component 14, a cyclone separator 15, a washing water inlet 16, an anti-impact dispersion plate 17, a mixed washing cylinder 18 and a wire mesh type mixing component 19.
Scour protection dispersion board 17 and the mixed component 14 of metal plate formula are constituteed jointly and are mixed the washing component and install in mixed washing section of thick bamboo 18, and scour protection dispersion board 17 is whole to be oval bow-shaped board, has two kinds of structures: one is a nonporous elliptical light panel, and the other is an apertured elliptical panel; the oval plate of trompil is as the last plywood of scour protection dispersion board 17, mainly plays the dispersion to the gas-liquid misce bene, makes gas-liquid misce bene evenly distributed on metal plate formula mixing element 14 surface, and figure 3 is the structural schematic diagram of last layer scour protection dispersion board, and the round hole that the trompil was arranged for being regular triangle on it, and the oval plate top of trompil is sclausura oval worn-out fur.
The metal plate type mixing member 14 is formed by stacking 2 to 10 layers of metal plates in a zigzag shape, and has a circular cake shape as a whole. The mixing elements may be of other forms than metal plate type, such as wire mesh type 19 shown in fig. 2, which is formed by laying corrugated wire mesh layers, with two adjacent layers of wire mesh layers arranged at 90 degrees to each other.
The lower end of the mixing washing cylinder 18 is provided with a collecting box 3, and the collecting box 3 is uniformly provided with cyclone separators 15 along the circumferential direction, as shown in figure 4; the collecting box 3 and the cyclone separators 15 are both positioned in the horizontal tank body 1, the collecting box 3 can be cylindrical or square-barrel-shaped, and the number of the cyclone separators can be 1-10.
The liquid-liquid separation element 12 employs a wire mesh coalescer.
The liquid removing device 8 is arranged in front of the gas phase outlet 11 and is formed by filling a wire mesh in a round or square metal groove body with two open ends.
During operation, chlorine-containing oil and water washing water respectively enter a mixed washing cylinder 18 through an oil gas inlet 13 and a water washing water inlet 16, the chlorine-containing oil and the water washing water are mixed and washed through an anti-impact dispersion plate 17 of a mixed washing element and a metal plate type mixing member 14 and then enter a collecting box 3, the chlorine-containing oil and the water washing water enter a cyclone separator 15 through the flow guiding effect of the collecting box 3, a gas phase and a liquid phase are separated in the cyclone separator 15, the liquid phase falls into the bottom of a horizontal tank body below the cyclone separator 15, the oil phase and the water phase are coalesced after passing through a liquid-liquid separating element 12 (a wire mesh coalescer), the oil phase and the water phase are further settled under the action of gravity in a settling area partitioned by a baffle 6, the water washing water dissolved with chlorine ions and salt is discharged out of a device through a chlorine-containing water outlet 5 on a water separating drum 4, and. The gas phase separated by the cyclone separator 15 is further separated from liquid drops carried in the gas phase through a liquid remover 8, the gas phase without chloride ions is discharged through a gas phase outlet 11 on the horizontal tank body, and the collected liquid drops fall into a settling zone under the action of gravity.
Claims (10)
1. The utility model provides an oil gas washing dechlorination device which characterized in that: the device comprises a horizontal tank body, and a mixed washing drum, a gas phase outlet, a water distribution bag, a baffle and a dechlorinated oil outlet which are sequentially arranged from left to right along the axis of the horizontal tank body, wherein the mixed washing drum is arranged on the outer wall of the left end of the horizontal tank body, the gas phase outlet is arranged at the top of the horizontal tank body, the water distribution bag is arranged on the outer side of the bottom of the horizontal tank body, and the baffle is arranged at the bottom of the horizontal tank body at; the mixed washing cylinder is a vertical cylinder, the top of the mixed washing cylinder is provided with an oil-gas inlet and a water washing water inlet, a mixed washing element is arranged in the mixed washing cylinder, the lower end of the mixed washing cylinder is provided with a collecting box, the collecting box is provided with a cyclone separator along the circumferential direction, and the collecting box and the cyclone separator are both positioned in the horizontal tank body; and a chlorine-containing water outlet is formed in the bottom of the water diversion bag.
2. The oil and gas wash dechlorination apparatus of claim 1, wherein: the mixing washing element comprises an anti-impact dispersion plate and a mixing member, and the mixing member is arranged below the anti-impact dispersion plate.
3. The oil and gas wash dechlorination apparatus of claim 2, wherein: scour protection dispersion board make by 2 ~ 6 layers, the oval bow-shaped metal sheet of thickness 1 ~ 10mm, the metal sheet is 5 ~ 45 degrees with mixed washing section of thick bamboo axis installation contained angle, two-layer metal sheet symmetrical arrangement about, two-layer metal sheet interval is 40 ~ 100mm about, the circular port that the equipartition was regular triangle and arranges on the last layer scour protection dispersion board.
4. The oil and gas wash dechlorination apparatus of claim 2, wherein: the mixing member is formed by a metal plate or by a corrugated wire mesh which is laid flat.
5. The oil and gas wash dechlorination apparatus of claim 4, wherein: the thickness of the metal plates is 0.1-8 mm, the included angle between each metal plate and the axis of the mixed washing cylinder is 10-60 degrees, the distance between the two adjacent metal plates on the left and right is 1-10 mm, the tops and the bottoms of the two adjacent metal plates on the left and right are connected into a whole through metal plate strips to form a layer, and the height of each layer of metal plate is 40-100 mm; two adjacent layers of metal plates are symmetrically arranged up and down, and 2-10 layers of metal plates are overlapped together to form a channel which is communicated up and down.
6. The oil and gas wash dechlorination apparatus of claim 4, wherein: the corrugated type specification of the corrugated silk screen is 0.1-2 mm silk diameter, two adjacent layers of silk screens are arranged in a staggered 90-degree mode, the total height of the silk screens is 50-800 mm, and channels which are mutually crossed and mutually communicated are formed inside the silk screens.
7. The oil and gas wash dechlorination apparatus of claim 1, wherein: the collecting box is cylindrical or square barrel-shaped, and the cyclone separators are uniformly distributed on the collecting box along the circumferential direction of the collecting box.
8. The oil gas washing dechlorination device of any one of claims 1 to 7, which is characterized in that: and a liquid-liquid separation element is arranged at the bottom of the horizontal tank body between the mixing washing cylinder and the water distribution bag and close to the water distribution bag.
9. The oil and gas wash dechlorination apparatus of claim 8, wherein: the liquid-liquid separation element is a silk screen coalescer, the silk screen is composed of steel wires with the wire diameter of 0.1-2 mm, and the thickness of the silk screen is 50-500 mm.
10. The oil gas washing dechlorination device of any one of claims 1 to 7, which is characterized in that: a liquid removing device is arranged in front of the gas phase outlet and is formed by filling a wire mesh in a round or square metal groove body with two open ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922324172.5U CN211963647U (en) | 2019-12-23 | 2019-12-23 | Oil gas washing dechlorination device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922324172.5U CN211963647U (en) | 2019-12-23 | 2019-12-23 | Oil gas washing dechlorination device |
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| Publication Number | Publication Date |
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| CN211963647U true CN211963647U (en) | 2020-11-20 |
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| CN201922324172.5U Active CN211963647U (en) | 2019-12-23 | 2019-12-23 | Oil gas washing dechlorination device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114345257A (en) * | 2022-01-06 | 2022-04-15 | 上海安恪企业管理咨询有限公司 | Trapping device, system and method for preventing salt deposition of refining device |
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2019
- 2019-12-23 CN CN201922324172.5U patent/CN211963647U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114345257A (en) * | 2022-01-06 | 2022-04-15 | 上海安恪企业管理咨询有限公司 | Trapping device, system and method for preventing salt deposition of refining device |
| CN114345257B (en) * | 2022-01-06 | 2024-05-10 | 上海安恪企业管理咨询有限公司 | Salt-caking prevention trapping device, system and method for refining device |
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