CN213885037U - Reflux system of flash tower - Google Patents

Abstract

A reflux system of a flash distillation tower comprises a methanol tank, a circulating pipe, a first methanol pump, a second methanol pump, a reflux pipe and at least one liquid discharge pipe, wherein a feeding pipe is arranged at the top of the methanol tank, one end of the circulating pipe is connected with the bottom of the methanol tank, the other end of the circulating pipe is connected with the top of the methanol tank, a first valve is arranged on the circulating pipe, the first methanol pump is arranged on the circulating pipe and positioned at the upstream of the first valve, the upstream end of the reflux pipe is connected with the circulating pipe and positioned between the first methanol pump and the first valve, a second valve is arranged between the first methanol pump and the first valve, a third valve is respectively arranged on each liquid discharge pipe, a liquid discharge port of the second methanol pump is respectively connected with the methanol tank through the first pipeline, the second pipeline is connected with the reflux pipe, a fourth valve is arranged on the first pipeline, the second pipeline is positioned at the downstream of the second valve, and is provided with a fifth valve. The utility model has the advantages of simple structure, convenient operation, it is convenient to adjust the reflux ratio, and the utilization ratio is higher.

Description

Reflux system of flash tower

Technical Field

The utility model relates to a chemical industry field, in particular to reflux system of flash column.

Background

The plant area of the chemical industry enterprise is provided with a flash tower for flash separation of DMA materials, methanol obtained by separation is discharged to a methanol tank through the top of the tower, and DMA obtained by separation is discharged to a storage tank through the bottom of the tower for downstream processing. The flash tower is matched with a methanol reflux system and used for providing methanol reflux liquid for the flash tower.

At present, the supporting methanol pump of methanol reflux system still provides methyl alcohol as the raw materials to the dissolving kettle that the chemical plant set up except that providing the reflux to the flash column for supporting methanol pump lift flow is great, when providing the methanol reflux to the flash column alone, because the required reflux capacity of flash column is little, supporting methanol pump power waste is unfavorable for energy-concerving and environment-protective, and is unfavorable for adjusting methanol reflux capacity.

Disclosure of Invention

The utility model aims at prior art not enough, provide a reflux system of flash column, its simple structure, convenient operation, it is convenient to adjust the reflux ratio, and the utilization ratio is higher.

The technical scheme of the utility model is that: a reflux system of a flash tower comprises a methanol tank, a circulating pipe, a first methanol pump, a second methanol pump, a reflux pipe and at least one liquid discharge pipe, wherein the flow of the first methanol pump is larger than that of the second methanol pump, a feeding pipe is arranged at the top of the methanol tank and is used for being connected with a methanol source, one end of the circulating pipe is connected with the bottom of the methanol tank, the other end of the circulating pipe is connected with the top of the methanol tank, a first valve is arranged on the circulating pipe, the first methanol pump is arranged on the circulating pipe and is positioned at the upstream of the first valve, the upstream end of the reflux pipe is connected with the circulating pipe and is positioned between the first methanol pump and the first valve, the downstream end of the reflux pipe is used for being connected with the side wall of the flash tower, a second valve is arranged on the reflux pipe, the upstream end of the liquid discharge pipe is connected with the circulating pipe and is positioned between the first methanol pump and the first valve, and a third valve is respectively arranged on each liquid discharge pipe, the liquid inlet of the second methanol pump is used for being connected with a methanol source, the liquid outlet of the second methanol pump is respectively connected with the methanol tank through a first pipeline, the second pipeline is connected with the return pipe, the first pipeline is provided with a fourth valve, and the second pipeline is positioned at the downstream of the second valve and is provided with a fifth valve.

The downstream end of the feed pipe is connected with the circulating pipe and is positioned at the downstream of the first valve.

The number of the liquid discharge pipes is two, wherein one liquid discharge pipe is used for providing methanol for the dissolving kettle, and the other liquid discharge pipe is used for connecting with a methanol source.

And the fourth valve and the fifth valve are ball valves.

Adopt above-mentioned technical scheme to have following beneficial effect:

1. the reflux system of the flash tower comprises a methanol tank, a circulating pipe, a first methanol pump, a second methanol pump, a reflux pipe and at least one liquid discharge pipe, wherein the flow of the first methanol pump is larger than that of the second methanol pump. The top of the methanol tank is provided with a feeding pipe which is used for connecting with a methanol source and supplementing methanol into the methanol tank as a raw material or reflux. One end of the circulating pipe is connected with the bottom of the methanol tank, the other end of the circulating pipe is connected with the top of the methanol tank, a first valve is arranged on the circulating pipe, the first methanol pump is arranged on the circulating pipe and located at the upstream of the first valve, and the methanol in the methanol tank is circulated between the methanol tank and the first methanol pump by opening the first methanol pump and the first valve. The upstream end of back flow links to each other with the circulating pipe, is located between first methanol pump, the first valve, and the low reaches end of back flow is used for linking to each other with the lateral wall of flash column, be equipped with the second valve on the back flow, through the aperture of opening first valve, second valve, can realize adjusting the purpose of back flow, circulating pipe flow, provides the backwash liquid to the flash column. The upper stream end of the liquid discharge pipe is connected with the circulating pipe and is positioned between the first methanol pump and the first valve, each liquid discharge pipe is provided with a third valve, and when methanol is required to be provided for other equipment in a chemical plant area as a raw material or a medium, the methanol can be discharged outside through the liquid discharge pipe by opening the corresponding third valve on the liquid discharge pipe, so that the actual requirements of enterprises are met. The liquid inlet of the second methanol pump is used for being connected with a methanol source, the liquid outlet of the second methanol pump is respectively connected with the methanol tank through a first pipeline, the second pipeline is connected with the return pipe, the first pipeline is provided with a fourth valve, and the second pipeline is positioned at the downstream of the second valve and is provided with a fifth valve. And the second valve is closed, the fifth valve is opened, and the methanol is provided to the flash tower as reflux. Other equipment in the factory is provided with methanol in need, or when the flash tank is provided with methanol reflux liquid simultaneously, open the great first methanol pump of flow, and control first valve, the second valve, correspond the aperture of fluid-discharge tube third valve, realize providing methanol externally, the purpose of providing methanol reflux liquid to the flash tower, effectively satisfy the actual demand of enterprise, and the high-usage of first methanol pump, when only needing to provide reflux liquid to the flash tower, open the second methanol pump, and control the fourth valve, the aperture of fifth valve, supply methanol to the methanol tank through first pipeline, provide methanol reflux liquid to the flash tank through the second pipeline simultaneously, and the replenishment flow of methanol tank and the reflux flow of flash tank are all controllable, effectively satisfy the actual demand of enterprise, and the reflux power is low, still accord with energy-concerving and environment-protective requirement.

2. The fourth valve and the fifth valve are ball valves, and the opening degrees of the fourth valve and the fifth valve can be adjusted to meet the purpose of adjusting the methanol reflux ratio of the flash tank.

The following further description is made with reference to the accompanying drawings and detailed description.

Drawings

Fig. 1 is a schematic connection diagram of the present invention.

In the attached drawing, 1 is a methanol tank, 2 is a circulating pipe, 3 is a first methanol pump, 4 is a second methanol pump, 5 is a return pipe, 6 is a liquid discharge pipe, 7 is a feed pipe, 8 is a first pipeline, 9 is a second pipeline, a is a first valve, b is a second valve, c is a third valve, d is a fourth valve, and e is a fifth valve.

Detailed Description

The utility model discloses in, do not mark the device, the equipment of specific structure, adopt the conventional device or the equipment in chemical industry field usually, do not mark the installation, the connected mode that adopt the conventional installation in chemical industry field usually of specific installation, connected mode or install, connect according to the guide suggestion of producer.

Referring to fig. 1, an embodiment of a reflux system for a flash column is shown. The reflux system of the flash tower comprises a methanol tank 1, a circulating pipe 2, a first methanol pump 3, a second methanol pump 4, a reflux pipe 5 and at least one liquid discharge pipe 6, wherein the flow of the first methanol pump 3 is larger than that of the second methanol pump 4. The top of methanol tank 1 is equipped with inlet pipe 7 for be connected with the methanol source, specifically, the methanol source can be the discharged liquid phase of flash column tower top heat exchanger, also can be other finished product methyl alcohol. One end of the circulating pipe 2 is connected with the bottom of the methanol tank 1, the other end of the circulating pipe is connected with the top of the methanol tank 1, a first valve a is arranged on the circulating pipe 2, the first methanol pump 3 is arranged on the circulating pipe 2 and is positioned at the upstream of the first valve a, and specifically, the downstream end of the feeding pipe is connected with the circulating pipe and is positioned at the downstream of the first valve. The upstream end of back flow pipe 5 links to each other with circulating pipe 2, is located between first methanol pump 3, first valve a, and the downstream end of back flow pipe 5 is used for linking to each other with the lateral wall of flash column, provides the methanol reflux to flash column, be equipped with second valve b on the back flow pipe 5. The upstream end of the liquid discharge pipe 6 is connected with the circulating pipe 2 and is positioned between the first methanol pump 3 and the first valve a, and the liquid discharge pipe 6 is provided with a third valve c respectively. And a liquid inlet of the second methanol pump 4 is used for being connected with a methanol source, and the methanol source can be a liquid phase discharged from a heat exchanger at the top of the flash tower and can also be other finished product methanol. A liquid discharge port of the second methanol pump 4 is connected with the methanol tank 1 through a first pipeline 8, a second pipeline 9 is connected with the return pipe 5, the first pipeline 8 is provided with a fourth valve d, the second pipeline 9 is positioned at the downstream of the second valve b and is provided with a fifth valve e, and specifically, the fourth valve and the fifth valve are all ball valves.

The utility model discloses a theory of operation does: methanol was added to the methanol tank via feed line. When needs provide methyl alcohol to other equipment in factory, perhaps need provide methyl alcohol reflux to the flash tank simultaneously, open the great first methyl alcohol pump of flow, and control first valve, the second valve, correspond the aperture of fluid-discharge tube third valve, provide methyl alcohol as the reflux to the flash column through the back flow, to other equipment through the fluid-discharge tube, provide methyl alcohol as raw materials or carrier if dissolving the cauldron, the realization is external to provide methyl alcohol, provide the purpose of methyl alcohol reflux to the flash column, effectively satisfy the actual demand of enterprise, and the high-usage of first methyl alcohol pump. When only need provide the reflux to the flash column, open the less second methanol pump of flow, and control the aperture of fourth valve, fifth valve, supply a small amount of methyl alcohol to the methanol tank through first pipeline, provide the methyl alcohol reflux to the flash tank through the second pipeline simultaneously, and the supplementary flow of methanol tank and the reflux flow of flash tank are all controllable, effectively satisfy the actual demand of enterprise.

Claims (4)

1. A reflux system of a flash column, characterized in that: comprises a methanol tank (1), a circulating pipe (2), a first methanol pump (3), a second methanol pump (4), a return pipe (5) and at least one liquid discharge pipe (6), wherein the flow rate of the first methanol pump (3) is greater than that of the second methanol pump (4),

the top of the methanol tank (1) is provided with a feeding pipe (7) for connecting with a methanol source, one end of the circulating pipe (2) is connected with the bottom of the methanol tank (1), the other end is connected with the top of the methanol tank (1), the circulating pipe (2) is provided with a first valve (a), the first methanol pump (3) is arranged on the circulating pipe (2) and is positioned at the upstream of the first valve (a),

the upstream end of the return pipe (5) is connected with the circulating pipe (2) and is positioned between the first methanol pump (3) and the first valve (a), the downstream end of the return pipe (5) is used for being connected with the side wall of the flash tower, the return pipe (5) is provided with a second valve (b),

the upstream end of the liquid discharge pipe (6) is connected with the circulating pipe (2) and is positioned between the first methanol pump (3) and the first valve (a), each liquid discharge pipe (6) is respectively provided with a third valve (c),

the liquid inlet of the second methanol pump (4) is used for being connected with a methanol source, the liquid outlet of the second methanol pump (4) is respectively connected with the methanol tank (1) through a first pipeline (8), a second pipeline (9) is connected with the return pipe (5), the first pipeline (8) is provided with a fourth valve (d), and the second pipeline (9) is located at the downstream of the second valve (b) and is provided with a fifth valve (e).

2. The reflux system of the flash column of claim 1, wherein: the downstream end of the feeding pipe (7) is connected with the circulating pipe (2) and is positioned at the downstream of the first valve (a).

3. The reflux system of the flash column of claim 1, wherein: the number of the liquid discharge pipes (6) is two, wherein one liquid discharge pipe is used for providing methanol for the dissolving kettle, and the other liquid discharge pipe is used for connecting with a methanol source.

4. The reflux system of the flash column of claim 1, wherein: and the fourth valve (d) and the fifth valve (e) both adopt ball valves.

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