CN210662324U - Flare gas buffer unit used in front of MTO system flare - Google Patents

Abstract

The utility model discloses a torch gas buffer unit for before MTO system torch, it includes buffer tank, skimming jar, sewage pump and skimming pump, and the export of buffer tank bottoms is through the import intercommunication of first control valve with the sewage pump, and the export of sewage pump is divided into two the tunnel, and the entry intercommunication of second control valve and skimming jar is crossed all the way to one, and another way is through the import intercommunication of third control valve with sewage treatment system. The advantages are that: the water-hydrocarbon mixture discharged from the buffer tank can be fully kept stand and layered in the oil skimming tank, and hydrocarbon substances on the upper layer of the oil skimming tank can be collected in the oil product recovery tank for recycling, so that the utilization rate of oil products is improved, and the output value is increased; the hydrocarbon content in the sewage at the lower layer of the skimming tank is obviously reduced, the load of a subsequent sewage treatment system is greatly reduced, and the cost of sewage treatment is reduced; the sewage pump and the oil skimming pump are mutually standby, and when any pump body is damaged and maintained, the other pump body is put into operation, so that the stable operation of the system is ensured.

Description

Flare gas buffer unit used in front of MTO system flare

The technical field is as follows:

the utility model relates to a MTO system technical field, specifically speaking relate to a torch gas buffer unit that is used for before MTO system torch.

Background art:

the MTO system consists of a methanol-to-olefin unit and an olefin separation unit, wherein the methanol-to-olefin unit comprises a reaction regeneration system, a heat taking system, a quenching system and a stripping system; the olefin separation unit comprises a methanol gasification system, a feed gas compression system, an acid gas removal system, a waste alkali liquor treatment system, a feed gas stripping and condensate drying system, a gas regeneration part, a depropanization system, a demethanization system, an deethanization system, acetylene hydrogenation, an ethylene rectifying tower, a propylene rectifying tower, a debutanizer and a propylene refrigeration system. The methanol/water vapor and oxide recycling system of the methanol gasification system, the safety valve pressure relief of the reaction regeneration system and the quenching alkali washing unit and the like do not relate to separate torch pipelines, and are all merged into a buffer tank in front of a torch, the buffer tank generally contains three substances of water, gas and oil (hydrocarbon), at present, gas produced at the top is sent into the torch for combustion, and a water-hydrocarbon mixture discharged at the bottom is directly sent into a sewage treatment unit, but the water-hydrocarbon mixture discharged at the bottom contains a large amount of C5+ substances and is discharged into the sewage treatment unit together with sewage, so that on one hand, oil loss is caused, on the other hand, the load of the sewage treatment unit is increased, and the treatment cost is high.

The utility model has the following contents:

an object of the utility model is to provide a torch gas buffer unit for before MTO torch can effectively improve oil utilization ratio.

The utility model discloses by following technical scheme implement: a flare gas buffer unit used in front of an MTO system torch comprises a buffer tank, a skimming tank, a sewage pump and a skimming pump, wherein an outlet at the bottom of the buffer tank is communicated with an inlet of the sewage pump through a first control valve, an outlet of the sewage pump is divided into two paths, one path is communicated with an inlet of the skimming tank through a second control valve, and the other path is communicated with an inlet of a sewage treatment system through a third control valve; the upper portion and the lower part of oil skimming tank communicate respectively have oil drain port and outlet, the outlet through the fourth control valve with the import of sewage pump communicates, the oil drain port with the import of oil skimming pump communicates, the export of oil skimming pump communicates with oil recovery jar.

Furthermore, a fifth control valve is arranged between the oil discharge port and the inlet of the sewage pump, and a sixth control valve is communicated between the outlet of the sewage pump and the oil recovery tank.

Furthermore, a seventh control valve is arranged between an outlet at the bottom of the buffer tank and an inlet of the oil skimming pump, and an eighth control valve, a ninth control valve and a tenth control valve are respectively arranged between the outlet of the oil skimming pump and the inlets of the oil recovery tank, the oil skimming tank and the sewage treatment system.

Further, the oil skimming tank comprises a tank body, a liquid level meter and a floating drum boundary level meter are arranged on the side wall of the tank body, the upper part and the lower part of the tank body are respectively communicated with the oil discharge port and the water discharge port, and an observation window sealed by a glass plate is arranged on the side wall of the tank body; the top of the tank body is provided with a pressure gauge, a breather valve and a pressure charging valve.

The utility model has the advantages that: the water-hydrocarbon mixture discharged from the buffer tank can be fully kept stand and layered in the oil skimming tank, and hydrocarbon substances on the upper layer of the oil skimming tank can be collected in the oil product recovery tank for recycling, so that the utilization rate of oil products is improved, and the output value is increased; the hydrocarbon content in the sewage at the lower layer of the skimming tank is obviously reduced, the load of a subsequent sewage treatment system is greatly reduced, and the cost of sewage treatment is reduced; the sewage pump and the oil skimming pump are mutually standby, and when any pump body is damaged and maintained, the other pump body is put into operation, so that the stable operation of the system is ensured.

Description of the drawings:

fig. 1 is a schematic view of the entire structure of embodiment 1.

Fig. 2 is a schematic diagram of the construction of the skimming tank.

Fig. 3 is a schematic view of the entire structure of embodiment 2.

The device comprises a buffer tank 1, a skimming tank 2, a sewage pump 3, a skimming pump 4, a first control valve 5, a second control valve 6, a third control valve 7, an oil discharge port 2.1, a water discharge port 2.2, a tank body 2.3, a liquid level meter 2.4, a buoy level gauge 2.5, an observation window 2.6, a pressure gauge 2.7, a breather valve 2.8, a pressurizing valve 2.9, a fourth control valve 8, a sewage treatment system 9, an oil recovery tank 10, a fifth control valve 11, a sixth control valve 12, a seventh control valve 13, an eighth control valve 14, a ninth control valve 15 and a tenth control valve 16.

The specific implementation mode is as follows:

in the description of the present invention, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Example 1: as shown in fig. 1 and 2, the flare gas buffer unit used before a torch of an MTO system comprises a buffer tank 1, a skimming tank 2, a sewage pump 3 and a skimming pump 4, wherein an outlet at the bottom of the buffer tank 1 is communicated with an inlet of the sewage pump 3 through a first control valve 5, an outlet of the sewage pump 3 is divided into two paths, one path is communicated with an inlet of the skimming tank 2 through a second control valve 6, and the other path is communicated with an inlet of a sewage treatment system 9 through a third control valve 7; the upper part and the lower part of the oil skimming tank 2 are respectively communicated with an oil discharge port 2.1 and a water discharge port 2.2, the water discharge port 2.2 is communicated with the inlet of the sewage pump 3 through a fourth control valve 8, the oil discharge port 2.1 is communicated with the inlet of the oil skimming pump 4, and the outlet of the oil skimming pump 4 is communicated with an oil recovery tank 10.

The oil skimming tank 2 comprises a tank body 2.3, the side wall of the tank body 2.3 is provided with a liquid level meter 2.4 and a buoy boundary level meter 2.5, the liquid level in the tank body 2.3 can be detected through the liquid level meter 2.4, and the water-hydrocarbon interface position in the tank body 2.3 can be detected through the buoy boundary level meter 2.5; the upper part and the lower part of the tank body 2.3 are respectively communicated with an oil drain port 2.1 and a water drain port 2.2, the side wall of the tank body 2.3 is provided with an observation window 2.6 sealed by a glass plate, and the water-hydrocarbon layering condition in the tank body 2.3 can be directly observed through the observation window 2.6; the top of the tank body 2.3 is provided with a pressure gauge 2.7, a breather valve 2.8 and a pressure charging valve 2.9, the breather valve 2.8 and the pressure charging valve 2.9 are respectively connected with a vent pipeline and a nitrogen gas source, the pressure in the tank body 2.3 can be monitored through the pressure gauge 2.7, if the pressure is too high, the breather valve 2.8 is opened to release the pressure for adjustment, and if the pressure is too low, the pressure is adjusted by charging nitrogen gas into the tank body 2.3 through the pressure charging valve 2.9.

The working principle is as follows: all valves of the system are initially closed, after the liquid in the buffer tank 1 reaches a certain liquid level, the first control valve 5 and the second control valve 6 are firstly opened, the sewage pump 3 is started, and the water-hydrocarbon mixture in the buffer tank 1 is sent into the oil skimming tank 2 through the sewage pump 3; then, the sewage pump 3, the first control valve 5 and the second control valve 6 are closed, so that the water-hydrocarbon mixture is subjected to standing and layering in the oil skimming tank 2, the water is at the lower layer, and the hydrocarbon substances are at the upper layer; then, starting the skimming pump 4 to pump the upper hydrocarbon substances in the skimming tank 2 to the oil product recovery tank 10 for recycling; and finally, the oil skimming pump 4 is closed, the fourth control valve 8 and the third control valve 7 are opened, the sewage pump 3 is started, and the water in the oil skimming tank 2 is pumped to a sewage treatment system 9 through the sewage pump 3 for treatment.

Example 2: as shown in fig. 3, the whole structure is the same as that of embodiment 1, except that a fifth control valve 11 is arranged between the oil discharge port 2.1 and the inlet of the sewage pump 3, and a sixth control valve 12 is communicated between the outlet of the sewage pump 3 and the oil recovery tank 10; a seventh control valve 13 is arranged between the outlet of the bottom of the buffer tank 1 and the inlet of the skimming pump 4, and an eighth control valve 14, a ninth control valve 15 and a tenth control valve 16 are respectively arranged between the outlet of the skimming pump 4 and the inlet of the oil recovery tank 10, the inlet of the skimming tank 2 and the inlet of the sewage treatment system 9.

In this embodiment, the sewage pump 3 and the oil skimming pump 4 are used as one spare, and the specific working principle is as follows:

when the sewage pump 3 works: all valves of the system are initially closed, after the liquid in the buffer tank 1 reaches a certain liquid level, the first control valve 5 and the second control valve 6 are firstly opened, the sewage pump 3 is started, and the water-hydrocarbon mixture in the buffer tank 1 is sent into the oil skimming tank 2 through the sewage pump 3; then, the sewage pump 3, the first control valve 5 and the second control valve 6 are closed, so that the water-hydrocarbon mixture is subjected to standing and layering in the oil skimming tank 2, the water is at the lower layer, and the hydrocarbon substances are at the upper layer; then, the fifth control valve 11 and the sixth control valve 12 are opened, the sewage pump 3 is started, and under the action of the sewage pump 3, the hydrocarbon substances on the upper layer of the oil skimming tank 2 sequentially pass through the oil discharge port 2.1, the fifth control valve 11, the sewage pump 3 and the sixth control valve 12 to reach the oil product recovery tank 10; and finally, closing the fifth control valve 11 and the sixth control valve 12, opening the fourth control valve 8 and the third control valve 7, starting the sewage pump 3, and pumping the water in the skimming tank 2 to the sewage treatment system 9 for treatment through the sewage pump 3.

When the oil skimming pump 4 works: all valves of the system are initially closed, after the liquid in the buffer tank 1 reaches a certain liquid level, firstly, the seventh control valve 13 and the ninth control valve 15 are opened, the skimming pump 4 is started, and the skimming pump 4 sends the water-hydrocarbon mixture in the buffer tank 1 into the skimming tank 2; then, the seventh control valve 13, the ninth control valve 15 and the skimming pump 4 are closed, so that the water-hydrocarbon mixture is subjected to standing and layering in the skimming tank 2, the water is in the lower layer, and the hydrocarbon substances are in the upper layer; then, the eighth control valve 14 is opened, and the skimming pump 4 is started to pump the upper hydrocarbon substances in the skimming tank 2 to the oil product recovery tank 10 for recycling; and finally, the eighth control valve 14 is closed, the fifth control valve 11 and the tenth control valve 16 are started, and under the action of the skimming pump 4, sewage in the lower layer of the skimming tank 2 sequentially passes through the fifth control valve 11, the skimming pump 4 and the tenth control valve 16 and enters the sewage treatment system 9 for treatment.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (5)

1. A flare gas buffer unit used in front of a torch of an MTO system is characterized by comprising a buffer tank, a skimming tank, a sewage pump and a skimming pump, wherein an outlet at the bottom of the buffer tank is communicated with an inlet of the sewage pump through a first control valve; the water outlet of the oil skimming tank is communicated with the inlet of the sewage pump through a fourth control valve, the oil outlet of the oil skimming tank is communicated with the inlet of the oil skimming pump, and the outlet of the oil skimming pump is communicated with the oil recovery tank.

2. The flare gas buffering unit used before the MTO system flare of claim 1, wherein a fifth control valve is installed between the oil drain and the inlet of the sewage pump, and a sixth control valve is connected between the outlet of the sewage pump and the oil recovery tank.

3. The flare gas buffer unit used before the MTO system torch as claimed in any one of claims 1 or 2, wherein a seventh control valve is arranged between the outlet of the bottom of the buffer tank and the inlet of the oil skimming pump, and an eighth control valve, a ninth control valve and a tenth control valve are respectively arranged between the outlet of the oil skimming pump and the inlets of the oil recovery tank, the oil skimming tank and the sewage treatment system.

4. The flare gas buffer unit used in front of the MTO system torch as claimed in any one of claims 1 or 2, wherein the skimming tank comprises a tank body, a liquid level meter and a float level meter are arranged on the side wall of the tank body, the upper part and the lower part of the tank body are respectively communicated with the oil discharge port and the water discharge port, and the side wall of the tank body is provided with an observation window sealed by a glass plate; the top of the tank body is provided with a pressure gauge, a breather valve and a pressure charging valve.

5. The flare gas buffer unit used before the MTO system torch is characterized in that the skimming tank comprises a tank body, a liquid level meter and a buoy boundary level meter are arranged on the side wall of the tank body, the upper part and the lower part of the tank body are respectively communicated with the oil discharge port and the water discharge port, and the side wall of the tank body is provided with an observation window sealed by a glass plate; the top of the tank body is provided with a pressure gauge, a breather valve and a pressure charging valve.

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