CN211885451U - Tower top oil gas cooling device of catalytic fractionating tower - Google Patents
Tower top oil gas cooling device of catalytic fractionating tower Download PDFInfo
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- CN211885451U CN211885451U CN202020483583.9U CN202020483583U CN211885451U CN 211885451 U CN211885451 U CN 211885451U CN 202020483583 U CN202020483583 U CN 202020483583U CN 211885451 U CN211885451 U CN 211885451U
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Abstract
The utility model discloses a tower top oil gas cooling device of a catalytic fractionating tower, which comprises a heat exchanger group, a crude gasoline tank and an acid water tank; the heat exchanger group comprises at least three heat exchangers arranged in parallel, a heat medium inlet of each heat exchanger is communicated with an oil-gas main pipe, a heat medium outlet of each heat exchanger is connected with a discharge branch pipe, each discharge branch pipe is connected to a discharge main pipe, and the discharge main pipe is connected to a mixture inlet of the crude gasoline tank; a thermometer is arranged on the discharging branch pipe; the liquid phase outlet of the crude gasoline tank is connected with a reflux branch pipe and a gasoline branch pipe, the reflux branch pipe is used for being communicated with a reflux port at the upper part of the catalytic fractionating tower, the acid water outlet of the crude gasoline tank is communicated with the water inlet of the acid water tank through a water outlet pipe, the water outlet of the acid water tank is connected with a drain pipe, and the drain pipe is provided with a drain valve. This application utilizes the difference of the heat medium outlet temperature of the heat exchanger when taking place interior hourglass can judge whether take place the perforation in certain heat exchanger, causes interior hourglass.
Description
Technical Field
The utility model relates to a top of tower oil gas cooling device of catalytic fractionating tower.
Background
The catalytic fractionating tower is used for fractionating the overheated reaction oil gas from the reactor to obtain products with different boiling points, wherein the tower top oil gas discharged from the tower top of the catalytic fractionating tower needs to be cooled to obtain a corresponding liquid phase product, and meanwhile, part of the liquid phase flows back into the catalytic fractionating tower to adjust the tower top temperature. Because the temperature of the top of the tower oil gas that is discharged from the top of the catalytic fractionating tower is higher, a large amount of heat exchangers are required for cooling and condensing, and because the top of the tower oil gas still contains a certain amount of corrosive components, after the top of the tower oil gas is used for a period of time, the heat exchange tubes inside the heat exchangers can be perforated, so that condensed water enters an oil gas liquid phase, great influence is caused on subsequent process treatment, and the stable operation of the whole catalytic device can be influenced.
SUMMERY OF THE UTILITY MODEL
In order to find out the perforation inside the heat exchanger in time, the utility model provides a tower top oil gas cooling device of a catalytic fractionating tower, which comprises a heat exchanger group, a crude gasoline tank and an acid water tank, wherein the crude gasoline tank is provided with a mixture inlet, a rich gas outlet, a liquid phase outlet and an acid water outlet, and the acid water tank is provided with a water inlet and a water outlet;
the heat exchanger group comprises at least three heat exchangers arranged in parallel, a heat medium inlet of each heat exchanger is communicated with an oil-gas main pipe, the oil-gas main pipe is used for being connected to an oil-gas outlet at the top of a catalytic fractionating tower, a discharge branch pipe is connected to the heat medium outlet of each heat exchanger, each discharge branch pipe is connected to a discharge main pipe, and the discharge main pipe is connected to a mixture inlet of a crude gasoline tank; each discharging branch pipe is provided with a thermometer;
the liquid phase outlet of the crude gasoline tank is connected with two branch pipes which are respectively a reflux branch pipe and a gasoline branch pipe, the reflux branch pipe is used for being communicated with a reflux port at the upper part of the catalytic fractionating tower, the acid water outlet of the crude gasoline tank is communicated with the water inlet of the acid water tank through a water outlet pipe, the water outlet of the acid water tank is connected with a drain pipe, and the drain pipe is provided with a drain valve.
In this application, set up the heat exchanger that three at least parallel arrangements, in the normal operating process, the temperature of the oil gas by each heat exchanger exhaust should be roughly the same, its difference in temperature generally is between 1-2 ℃, when the emergence perforation of a certain heat exchanger, when causing interior hourglass, cooling water can enter into the oil gas, oil gas temperature has a reduction by a relatively large margin, the oil gas temperature that the heat exchanger that makes the interior hourglass discharged can be showing and is being less than the temperature of the oil gas that other heat exchangers discharged, under general conditions, the difference in temperature is at least 4-5 ℃, sometimes the difference in temperature can be bigger even, can judge whether take place the perforation in certain heat exchanger according to the difference between the heat medium outlet temperature of each heat exchanger, cause interior hourglass.
In order to reduce the moisture content separated from the crude gasoline in the crude gasoline tank, the crude gasoline tank comprises a tank body extending along the horizontal direction, a dewatering bag protruding downwards is arranged at the bottom of the tank body, and the acidic water outlet is arranged at the bottom of the dewatering bag. The moisture separated from the crude gasoline firstly enters the dehydration bag and downwards enters the acidic water tank, so that the probability of discharging from the liquid phase outlet is reduced.
Furthermore, a water outlet regulating valve and a flowmeter are arranged on the water outlet pipe. By controlling the opening of the water outlet regulating valve, the interface between the water and the oil body is always kept in the dehydration package, and the oil body is prevented from entering the acidic water tank. When the heat exchanger is perforated to cause internal leakage, cooling water can enter oil gas and enter a crude gasoline tank along with the oil gas, the water content separated from the oil gas is increased, the fluctuation of the acidic water volume is judged according to a flowmeter, when the acidic water volume exceeds the fluctuation upper limit and the temperature value displayed by a thermometer on a certain discharge branch pipe deviates from the normal range, the internal leakage of the corresponding heat exchanger can be further judged, and the heat exchanger needs to be switched out from the system for maintenance.
In order to further reduce the temperature of the oil gas and save part of cold energy, an air cooler group is arranged between the mixture inlets of the discharge main pipe and the crude gasoline tank, the air cooler group comprises at least three air coolers which are arranged in parallel, the inlet of each air cooler is connected to the discharge main pipe, the outlet of each air cooler is connected to an air cooling main pipe, and the air cooling main pipe is communicated with the mixture inlet of the crude gasoline tank.
Furthermore, an oil-gas cooler group is arranged between the air cooling main pipe and the mixture inlet of the crude gasoline tank, the oil-gas cooler group comprises at least three oil-gas coolers which are arranged in parallel, the inlet of a heat medium channel of each oil-gas cooler is connected to the air cooling main pipe, the outlet of the heat medium channel of each oil-gas cooler is connected to a mixture pipe, and the mixture pipe is communicated with the mixture inlet of the crude gasoline tank; the refrigerant medium channel of each oil gas cooler is connected to a circulating cooling water pipeline which is a heat medium pipeline of the C3 and C4 gas separation towers.
The circulating cooling water pipeline is filled with deoxygenated water, and the deoxygenated water absorbs heat energy in oil gas and then conveys the heat energy to C3 and C4 gas separation towers to serve as heat sources of the C3 and C4 gas separation towers, so that the heat recovery utilization rate is improved.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a piping diagram of the heat exchanger.
Detailed Description
Referring to fig. 1, the overhead oil gas cooling device of the catalytic fractionating tower comprises a heat exchanger group 20, an air cooler group 30, an oil gas cooler group 60, a crude gasoline tank 40 and an acid water tank 51, wherein the crude gasoline tank 40 comprises a tank body 41 extending along the horizontal direction, a dewatering bag 45 protruding downwards and a liquid phase outlet 44 are arranged at the bottom of the tank body 41, and an acid water outlet 47 is arranged at the bottom of the dewatering bag 45. A mixture inlet 42 and a rich gas outlet 43 are provided at the top of the tank 41. The acid water tank 51 is a horizontal tank, and a water inlet 52 is provided at the top of the acid water tank 51, and a water outlet 53 is provided at the bottom of the acid water tank 51.
The heat exchanger group 20 comprises five heat exchangers arranged in parallel, wherein the five heat exchangers are respectively a first heat exchanger 21, a second heat exchanger 22, a third heat exchanger 23, a fourth heat exchanger 24 and a fifth heat exchanger 25. The heating medium inlet of each heat exchanger is communicated to the oil gas main pipe 111, the oil gas main pipe 111 is connected to the oil gas outlet 11 at the top of the catalytic fractionating tower 10, the heating medium outlet of each heat exchanger is connected with a discharge branch pipe, and each discharge branch pipe is connected to the discharge main pipe 112.
Taking the first heat exchanger 21 as an example to illustrate the connection pipe of each heat exchanger, please refer to fig. 2, the first heat exchanger 21 is a floating head type tube heat exchanger, the tube pass of the first heat exchanger 21 is a cooling medium channel, the shell pass is a heating medium channel, the inlet of the tube pass is connected with a cooling water inlet pipe 213, the outlet of the tube pass is connected with a cooling water outlet pipe 214, the inlet of the shell pass is connected with a first feeding branch pipe 211, the outlet of the shell pass is connected with a first discharging branch pipe 212, the first feeding branch pipe 211 is connected to the oil gas main pipe 111, the first discharging branch pipe 212 is connected to the discharging main pipe 112, and a thermometer 218 is installed on the first discharging branch pipe.
The structure and the connecting pipe of other heat exchangers are the same as those of the first heat exchanger, namely, a heat medium outlet of each heat exchanger is connected with a discharge branch pipe, each discharge branch pipe is connected to a discharge main pipe, and each discharge branch pipe is provided with a thermometer.
It is understood that in other embodiments, according to specific needs, the heat exchanger group may be provided with only three heat exchangers, or eight heat exchangers, and of course, other numbers of heat exchangers may be provided.
The air cooler group 30 is connected to the discharge header 112, and in this embodiment, the air cooler group 30 includes 16 air coolers 31, which are connected in parallel, and in the drawing, only 3 air coolers are exemplarily shown. The inlet of each air cooler 31 is connected to the discharge manifold 112 and the outlet of each air cooler 31 is connected to an air cooling manifold 113.
It is understood that in other embodiments, only three air coolers, or 12 air coolers may be provided in the air cooler group, or other numbers of air coolers may be provided according to specific needs.
The oil and gas cooler group 60 is connected to the air cooling manifold 113, and in this embodiment, the oil and gas cooler group 60 includes 5 oil and gas coolers 61 arranged in parallel. The inlet of the heating medium channel of each oil gas cooler 61 is connected to the air cooling header pipe 113, and the outlet of the heating medium channel of each oil gas cooler 61 is connected to a mixture pipe 115, and the mixture pipe 115 is communicated with the mixture inlet 42 of the crude gasoline tank. The refrigerant channel of each oil-gas cooler 61 is connected to a circulating cooling water pipeline 611, which is a heating medium pipeline of the C3 and C4 gas separation towers and is used for collecting the heat energy as a heat source of the C3 and C4 gas separation towers. In this embodiment, this oil gas cooler also is floating head shell and tube heat exchanger.
It will be appreciated that in other embodiments, the oil and gas cooler package may be provided with only three oil and gas coolers, or with eight oil and gas coolers, although other numbers of oil and gas coolers may be provided, depending on the particular needs.
The rich gas outlet 43 of the crude gasoline tank 40 is connected to a rich gas pipe 46, and the rich gas pipe 46 is connected to an inlet pipe of a gas compressor to send the rich gas discharged from the crude gasoline tank 40 to the next process.
A liquid phase outlet 44 of the crude gasoline tank 40 is connected to two branch pipes, which are a reflux branch pipe 441 and a gasoline branch pipe 445, respectively, the reflux branch pipe 441 is communicated with the reflux port 12 at the upper portion of the catalytic fractionation tower 10, and a reflux control valve 442 is installed on the reflux branch pipe 441. The gasoline branch pipe 445 is used to communicate with the absorption tower to refine the gasoline discharged from the crude gasoline tank 40, and a gasoline control valve 446 is installed on the gasoline branch pipe 445.
The acid water outlet 47 of the crude gasoline tank is communicated with the water inlet 52 of the acid water tank 51 through the water outlet pipe 48, the water outlet 53 of the acid water tank 51 is connected with a water outlet pipe 54, and a drain valve 55 is installed on the water outlet pipe 54. A flow meter 49 and a water outlet regulating valve 491 are mounted on the water outlet pipe 48, the water outlet regulating valve 491 is closer to the crude gasoline tank 40 than the flow meter 49, and a cut-off valve 492 is mounted on the water outlet pipe 48.
It will be appreciated that depending on the requirements and equipment configuration, in other embodiments, the oil and gas cooler package may be eliminated and the air cooling manifold connected directly to the batch inlet of the crude gasoline tank. Or the oil gas cooler group and the air cooler group are cancelled, and the discharge main pipe is connected to the mixture inlet of the crude gasoline tank.
Claims (5)
1. The tower top oil gas cooling device of the catalytic fractionating tower is characterized by comprising a heat exchanger group, a crude gasoline tank and an acid water tank, wherein the crude gasoline tank is provided with a mixture inlet, a rich gas outlet, a liquid phase outlet and an acid water outlet, and the acid water tank is provided with a water inlet and a water outlet;
the heat exchanger group comprises at least three heat exchangers arranged in parallel, a heat medium inlet of each heat exchanger is communicated with an oil-gas main pipe, the oil-gas main pipe is used for being connected to an oil-gas outlet at the top of a catalytic fractionating tower, a discharge branch pipe is connected to the heat medium outlet of each heat exchanger, each discharge branch pipe is connected to a discharge main pipe, and the discharge main pipe is connected to a mixture inlet of a crude gasoline tank; each discharging branch pipe is provided with a thermometer;
the liquid phase outlet of the crude gasoline tank is connected with two branch pipes which are respectively a reflux branch pipe and a gasoline branch pipe, the reflux branch pipe is used for communicating with a reflux port at the upper part of the catalytic fractionating tower, and the acid water outlet of the crude gasoline tank is communicated with the water inlet of the acid water tank through a water outlet pipe; the water outlet of the acid water tank is connected with a drain pipe, and a drain valve is arranged on the drain pipe.
2. The overhead hydrocarbon cooling system of claim 1 wherein the naphtha tank includes a tank body extending in a horizontal direction, a dewatering drum projecting downwardly is disposed at the bottom of the tank body, and the sour water outlet is disposed at the bottom of the dewatering drum.
3. The overhead oil and gas cooling device of claim 2, wherein a water outlet regulating valve and a flow meter are mounted on the water outlet pipe.
4. The overhead oil and gas cooling system of claim 1, wherein an air cooler group is disposed between the discharge manifold and the batch inlet of the naphtha tank, the air cooler group including at least three air coolers arranged in parallel, the inlet of each air cooler being connected to the discharge manifold, and the outlet of each air cooler being connected to an air cooling manifold that communicates with the batch inlet of the naphtha tank.
5. The overhead oil and gas cooling device of claim 4, wherein an oil and gas cooler group is arranged between the air cooling main and the mixture inlet of the crude gasoline tank, the oil and gas cooler group comprises at least three oil and gas coolers arranged in parallel, the inlet of the heating medium channel of each oil and gas cooler is connected to the air cooling main, the outlet of the heating medium channel of each oil and gas cooler is connected to a mixture pipe, and the mixture pipe is communicated with the mixture inlet of the crude gasoline tank; the refrigerant medium channel of each oil gas cooler is connected to a circulating cooling water pipeline which is a heat medium pipeline of the C3 and C4 gas separation towers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020483583.9U CN211885451U (en) | 2020-04-03 | 2020-04-03 | Tower top oil gas cooling device of catalytic fractionating tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020483583.9U CN211885451U (en) | 2020-04-03 | 2020-04-03 | Tower top oil gas cooling device of catalytic fractionating tower |
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| Publication Number | Publication Date |
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| CN211885451U true CN211885451U (en) | 2020-11-10 |
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| CN202020483583.9U Active CN211885451U (en) | 2020-04-03 | 2020-04-03 | Tower top oil gas cooling device of catalytic fractionating tower |
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2020
- 2020-04-03 CN CN202020483583.9U patent/CN211885451U/en active Active
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