CN215250194U - Acidic water dealkylation device - Google Patents
Acidic water dealkylation device Download PDFInfo
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- CN215250194U CN215250194U CN202120732355.5U CN202120732355U CN215250194U CN 215250194 U CN215250194 U CN 215250194U CN 202120732355 U CN202120732355 U CN 202120732355U CN 215250194 U CN215250194 U CN 215250194U
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Abstract
The present disclosure relates to an acidic water dealkylation apparatus comprising: a particulate filter, a low-pressure degassing tank and an evacuated supercharger; the low-pressure degassing tank is provided with an acid water inlet and an acid gas outlet; the inlet end of the particulate filter is communicated with an acidic water source, the outlet end of the particulate filter is communicated with an acidic water inlet, the acid gas outlet end of the particulate filter is communicated with the inlet end of a vacuumizing supercharger, and the outlet end of the vacuumizing supercharger is communicated with the inlet end of the acid gas treatment device. Through set up particulate filter at the entrance of low pressure degassing tank to the acid water that flows into in the low pressure degassing tank filters effectively, reduces the particulate matter in the acid water and enters into the low pressure degassing tank, improves the online operation cycle of low pressure degassing tank.
Description
Technical Field
The disclosure relates to the field of sewage treatment in the petrochemical industry, in particular to an acidic water dealkylation device.
Background
Sulfur-containing compounds and nitrogen-containing compounds exist in petroleum and products thereof, and can generate H2S and NH3 through reactions such as pyrolysis, catalytic cracking, catalytic hydrogenation and the like in the processing processes such as atmospheric and vacuum distillation, catalytic cracking, delayed coking, reforming pre-hydrogenation, hydrofining, hydrocracking and the like. These reactions produce H2S and NH3 which eventually enter the sour water discharged from various refinery units. The acidic water belongs to toxic wastewater with high pollutant concentration. The refinery sour water stripping device generally adopts a steam stripping mode to separate H2S and NH3 in the sour water, reduce the concentrations of H2S and NH3 in the sour water, obtain purified water through stripping, and discharge the purified water to a sewage treatment plant for further treatment.
A certain amount of light hydrocarbon is dissolved in the acidic water from each device of an oil refinery, and the hydrocarbon content of the acidic water is generally 1000-10000 mg/l. If the light hydrocarbon is not removed from the acid water, the acid gas produced by the acid water stripping device can carry hydrocarbons, and the operation and the product quality of a subsequent sulfur device are influenced. At present, an acid water degassing tank is generally arranged in front of an acid water storage tank of an acid water stripping device of a refinery, light hydrocarbon dissolved in acid water is removed in a flash evaporation mode, and the removed gas enters a low-pressure gas pipe network or an acid gas torch.
The sour water degassing tank is typically controlled by a nitrogen or fuel gas charge and flare discharge scheme, and to ensure that the sour gas can be discharged to the flare, the operating pressure of the sour water degassing tank is typically controlled to be between 150kPa (g) and 250kPa (g). The operation pressure is far higher than the pressure of the overhead liquid separation tank at the acid water source, for example, the pressure of the coking unit and the pressure of the catalytic unit fractionating overhead liquid separation tank are generally 50kPa (g) -100 kPa (g), and the temperature is basically consistent with the temperature of the overhead liquid separation tank at the acid water source, so that light hydrocarbon dissolved in the acid water cannot be effectively flashed out, and the acid water degassing tank basically has no degassing effect. When acid water which is not effectively degassed enters a subsequent acid water storage tank, hydrocarbon gas dissolved in the water and parts of H2S and NH3 are released due to the fact that the pressure is reduced to be close to the normal pressure, a large amount of generated toxic hydrocarbon-containing gas is discharged from the top of the tank, light hydrocarbon cannot be recovered, sulfide pollution and VOCs pollution are generated, and great potential safety hazards are brought to the acid water storage tank.
In addition, particles such as coke breeze are also present in the acidic water, and if filtration is not performed in time, abrasion is caused to the acidic water degassing tank, and the service life of the acidic water degassing tank is reduced.
SUMMERY OF THE UTILITY MODEL
The purpose of the present disclosure is to provide an acid water dealkylation device, which can filter particles such as coke breeze, avoid wearing and tearing the low-pressure degassing tank, and prolong the service life of the low-pressure degassing tank.
The present disclosure provides an acidic water dealkylation apparatus, characterized in that it comprises: a particulate filter, a low-pressure degassing tank and an evacuated supercharger;
the low-pressure degassing tank is provided with an acid water inlet and an acid gas outlet;
the entry end and the sour water source intercommunication of particulate matter filter and exit end with sour water entry intercommunication, the sour gas exit end with the entry end intercommunication of the booster compressor of managing to find time, the exit end of managing to find time the booster compressor is used for communicating with acid gas processing apparatus's entry end.
Optionally, the particulate filter is configured such that: it is possible to filter out particles of 50 μm to 3 mm.
Optionally, the pressure at the inlet end of the evacuation booster is between 2 and 10kPa (g), and the pressure at the outlet end of the evacuation booster is controlled to be between 100 and 300kPa (g).
Optionally, the sour water takes off hydrocarbon device still includes sour water pump and sump oil pump, the low pressure degassing tank is provided with degasification sour water export and sump oil export, degasification sour water export with the entry end intercommunication of sour water pump, sump oil export with the entry end intercommunication of sump oil pump.
Optionally, the low pressure degassing tank comprises a degassing tank body, the acid water inlet and the acid gas outlet both being disposed on the degassing tank body;
the degassing tank body comprises a degassing section for carrying out flash evaporation on gas in the acidic water and a separation section for carrying out oil-water separation on the acidic water subjected to flash evaporation in the degassing section; the degassing section is in communication with and above the separation section.
Optionally, the low pressure degassing tank further comprises a coalescing plate disposed within the separation section.
Optionally, the low-pressure degassing tank further comprises a foam breaking structure disposed within the degassing section, the foam breaking structure comprising a foam breaking baffle or a foam breaking grid.
Optionally, the low pressure degassing tank still includes sour water baffle and sump oil collection cell body, the sour water baffle with the sump oil collection cell body set up in the disengagement section, the sump oil collection cell body includes that the upper end is open form U-shaped groove and the lower extreme is formed with the sump oil export, the acid water of degasification export set up in the diapire of degassing tank body.
Optionally, the low-pressure degassing tank comprises a plurality of spray heads, the plurality of spray heads are arranged on the degassing tank body and are arranged towards the degassing section, and inlets of the plurality of spray heads are communicated with the acidic water inlet.
Optionally, the evacuation booster comprises a liquid ring vacuum pump or a liquid ring compressor.
In above-mentioned technical scheme, set up particulate filter through the entrance at the low pressure degassing tank to the acid water that flows into in the low pressure degassing tank filters effectively, reduces the particulate matter in the acid water and enters into the low pressure degassing tank, alleviates the wearing and tearing to the low pressure degassing tank, improves the life of low pressure degassing tank.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a schematic block diagram of an acid water dealkylation plant according to one embodiment of the present disclosure in which the low pressure degassing tank is configured in a horizontal configuration;
fig. 2 is a schematic structural view of an acid water dealkylation apparatus according to another embodiment of the present disclosure, in which a low-pressure degassing tank is constructed in a vertical type.
Description of the reference numerals
Equipment:
A. low-pressure degassing tank
B. Spray head
C. Foam breaking structure
D. Acid water partition
E. Sump oil collecting tank
F. Acid water pump
G. Sump oil pump
H. Evacuation supercharger
L, evacuation booster inlet pressure control circuit
Flow control loop of M, acid water liquid level-acid water outlet device
N, dirty oil liquid level-dirty oil outlet device flow control loop.
O, particulate filter
P, coalescence plate
Logistics:
1. acidic water
2. Acid gas
3. Dealkylation of acidic water
4. Dirty oil
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
As shown in fig. 1 and 2, the present disclosure provides an acidic water dealkylation apparatus comprising: a particulate filter O, a low-pressure degassing tank A and a vacuum supercharger H; the low-pressure degassing tank A is provided with an acid water inlet and an acid gas outlet. The inlet end of the particulate filter O is communicated with an acidic water source, the outlet end of the particulate filter O is communicated with an acidic water inlet, the acidic gas outlet end of the particulate filter O is communicated with the inlet end of the evacuation supercharger H, and the outlet end of the evacuation supercharger H is communicated with the inlet end of the acidic gas treatment device.
In this embodiment, by providing the particulate filter O at the inlet of the low-pressure degassing tank a, the acidic water flowing into the low-pressure degassing tank a is effectively filtered, so that the particulate matters in the acidic water are prevented from entering the low-pressure degassing tank a, the wear of the low-pressure degassing tank a is reduced, and the service life of the low-pressure degassing tank a is prolonged.
In one embodiment, the particulate filter O is configured such that: it is possible to filter out particles of 50 μm to 3 mm. So that particles in this size range cannot enter the low-pressure degassing tank a. However, the present disclosure does not limit the size of the particulate filter O that filters the particulate matter, and other filter sizes may be defined.
Optionally, the pressure at the inlet end of the evacuation supercharger H is controlled to be between 2 and 10kPa (g), and the pressure at the outlet end of the evacuation supercharger H is controlled to be between 100 and 300kPa (g). In the prior art, a degassing tank adopts a high-pressure mode to discharge acid gas inside, so that the problem that hydrocarbon gas cannot be effectively separated and can be discharged into a storage tank along with the acid water, sulfide pollution and VOCs pollution are caused, and potential safety hazards are caused at the same time.
In this embodiment, by providing the evacuation supercharger H and controlling the pressures on both the inlet side and the outlet side of the evacuation supercharger H, the inlet side is made low in pressure and the outlet side is made high in pressure; the hydrocarbon gas can be effectively separated in the low-pressure degassing tank a and discharged after being pressurized by the evacuation booster H.
Specifically, referring to fig. 1 and 2, there is provided an acid water de-hydrocarbon apparatus having different types of low pressure degassing tanks a, respectively, including: the device comprises a low-pressure degassing tank A, a spray head B, a foam breaking structure C, an acidic water partition plate D, a sump oil collecting tank body E, an acidic water pump F, a sump oil pump G, a vacuumizing supercharger H, a vacuumizing supercharger inlet pressure control loop L, an acidic water liquid level-acidic water outlet device flow control loop M and a sump oil liquid level-sump oil outlet device flow control loop N.
As shown in fig. 1, the low-pressure degassing tank a is horizontal, and the horizontal tank is provided with a degassing section separately on the top of the tank. As shown in fig. 2, the low-pressure degassing tank a is vertical, and the upper part of the vertical tank can be used as a degassing section.
The degassing section is used for flash evaporation of acid water; the oil-water separation section is used for separating acidic water and dirty oil. The degassing section is positioned above the oil-water separation section, and the two sections are communicated with each other.
The acidic water feeding in the low-pressure degassing tank A is provided with a spray head B, and the spray head B is connected with an acidic water inlet pipeline of the low-pressure degassing tank A; the degassing section is provided with foam breaking structure C in the low pressure degassing tank, and foam breaking structure C can adopt foam breaking baffle or foam breaking grid, and this disclosure does not limit this.
An acidic water partition plate D and a sump oil collecting groove body E are arranged in the oil-water separation section of the low-pressure degassing tank A; the bottom of the low-pressure degassing tank A is connected with an acidic water pump F after the acidic water partition plate D, and a sump oil collecting tank body E is connected with a sump oil pump G; the outlet at the top of the low-pressure degassing tank A is connected with the inlet of an evacuation supercharger H, the outlet of the evacuation supercharger H is connected with an acid gas outlet device line, and an evacuation supercharger inlet pressure control loop L is arranged on the return inlet line of the outlet of the evacuation supercharger H; an outlet of the acidic water pump F is provided with an acidic water liquid level-acidic water outlet device flow control loop M, and an outlet of the sump oil pump G is provided with a sump oil liquid level-sump oil outlet device flow control loop N.
Optionally, a coalescing plate P is further included in the separation section, and the coalescing plate P may be disposed on an inner top wall of the degassing tank body of the low-pressure degassing tank a or an inner bottom wall of the degassing tank body of the low-pressure degassing tank a, and the specific disposition position is not limited by the present disclosure. By providing the coalescence plate P, the efficiency of oil-water separation can be improved.
The process flow is shown in figure 1:
the sour water 1 stream enters the degassing section of the low pressure degassing tank a. In the degassing section, acidic water 1 is sprayed onto a foam breaking structure C at the lower part through a spray head B and then falls into an oil-water separation section of a low-pressure degassing tank A, and light hydrocarbon dissolved in the acidic water 1, a small amount of H2S and NH3 are flashed out as acidic gas 2. The acid gas 2 which is flashed out flows out from an outlet at the top of a degassing section of a low-pressure degassing tank A, is pumped and pressurized by a pumping booster H and then is sent out of the device to an inlet of a cooler in front of a fractionating tank at the top of a delayed coking device or a catalytic cracking device, and light hydrocarbon is recovered after compression, absorption and desulfurization. In order to prevent negative pressure from being formed in the low-pressure degassing tank A, the pressure at the inlet is controlled to be in the range of 2 to 10kPa (g) by an acid gas pressure control valve L which evacuates the outlet return inlet of the supercharger H.
The acidic water falling into the oil-water separation section A of the low-pressure degassing tank is settled by staying in the tank, so that oil-water layering is realized, and the dealkylated acidic water 3 and the dirty oil 4 are separated. An acidic water partition plate D is arranged in the tank to reduce oil carried by acidic water, and the dealkylated acidic water 3 after oil separation is sent to an acidic water storage tank by an acidic water pump F under the control of an acidic water liquid level-acidic water outlet device flow control loop M and then sent to a stripping tower for treatment. And a sump oil collecting tank body E in the low-pressure degassing tank A collects sump oil 4 on the acidic water, and the collected sump oil is sent to a fractionating tower top liquid separating tank of a delayed coking device or a catalytic cracking device by a sump oil pump G to be recovered under the control of a sump oil liquid level-sump oil outlet device flow control loop N.
A100 ton/h acid water stripping device of a certain domestic refinery processes acid water from a non-hydrogenation device of the refinery. The light hydrocarbon content in the acid water is about 2000 mg/l. If adopt the utility model discloses an acid water takes off hydrocarbon device and handles acid water, and the light hydrocarbon of dissolving in the acid water can basically be come out by whole flashes, and other devices of rethread obtain retrieving, if the annual time of operation calculates according to 8400 hours, recoverable light hydrocarbon 1680 ton every year. The recovered light hydrocarbon is calculated according to 3000 yuan/ton, and the new benefit is about 504 ten thousand yuan per year. The total power consumption of the pump is calculated according to 30kw, the power consumption is increased by 25.2 ten thousand degrees every year, the industrial power consumption is calculated according to 0.8 yuan/degree, and the cost is increased by about 20.2 ten thousand yuan every year. The added benefit minus the added cost totals about 483.8 ten thousand yuan per year.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. An acidic water dealkylation apparatus, comprising: a particulate filter, a low-pressure degassing tank and an evacuated supercharger;
the low-pressure degassing tank is provided with an acid water inlet and an acid gas outlet;
the entry end and the sour water source intercommunication of particulate matter filter and exit end with sour water entry intercommunication, the sour gas exit end with the entry end intercommunication of the booster compressor of managing to find time, the exit end of managing to find time the booster compressor is used for communicating with acid gas processing apparatus's entry end.
2. An acidic water dealkylation apparatus as claimed in claim 1 wherein the particulate filter is configured such that: it is possible to filter out particles of 50 μm to 6 mm.
3. The acidic water dealkylation apparatus as defined in claim 1, wherein the pressure at the inlet end of the evacuation booster is between 2-10 kPa (g), and the pressure at the outlet end of the evacuation booster is controlled between 100-300kPa (g).
4. The acid water dealkylation apparatus of claim 1 further comprising an acid water pump and a sump oil pump, wherein the low pressure degassing tank is provided with a degassed acid water outlet and a sump oil outlet, the degassed acid water outlet being in communication with an inlet end of the acid water pump, the sump oil outlet being in communication with an inlet end of the sump oil pump.
5. The acid water de-hydrocarbon apparatus of claim 4, wherein the low-pressure degassing tank comprises a degassing tank body, the acid water inlet and the acid gas outlet both being disposed on the degassing tank body;
the degassing tank body comprises a degassing section for carrying out flash evaporation on gas in the acidic water and a separation section for carrying out oil-water separation on the acidic water subjected to flash evaporation in the degassing section; the degassing section is in communication with and above the separation section.
6. The sour water dealkylation apparatus of claim 5 wherein the low pressure degassing tank further comprises a coalescing plate disposed within the separation section.
7. The acid water dealkylation apparatus of claim 5, wherein the low pressure degassing tank further comprises a foam breaking structure disposed within the degassing section, the foam breaking structure comprising a foam breaking baffle or a foam breaking grid.
8. The acid water dealkylation device of claim 5, wherein the low-pressure degassing tank further comprises an acid water partition plate and a dirty oil collection tank body, the acid water partition plate and the dirty oil collection tank body are arranged in the separation section, the dirty oil collection tank body comprises a U-shaped groove with an open upper end, the dirty oil outlet is formed at the lower end of the U-shaped groove, and the degassed acid water outlet is formed in the bottom wall of the degassing tank body.
9. The acid water dealkylation apparatus of claim 5 wherein the low pressure degassing tank includes a plurality of spray heads disposed in the degassing tank body and oriented toward the degassing section, the plurality of spray heads having inlets in communication with the acid water inlet.
10. The sour water dealkylation plant of claim 1, wherein the evacuation booster comprises a liquid ring vacuum pump or a steam evacuator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120732355.5U CN215250194U (en) | 2021-04-12 | 2021-04-12 | Acidic water dealkylation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120732355.5U CN215250194U (en) | 2021-04-12 | 2021-04-12 | Acidic water dealkylation device |
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| Publication Number | Publication Date |
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| CN215250194U true CN215250194U (en) | 2021-12-21 |
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| CN202120732355.5U Active CN215250194U (en) | 2021-04-12 | 2021-04-12 | Acidic water dealkylation device |
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| CN (1) | CN215250194U (en) |
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