CN213885038U

CN213885038U - Methanol recycling system

Info

Publication number: CN213885038U
Application number: CN202022677571.2U
Authority: CN
Inventors: 孙文刚; 王坤; 张华波; 余昌军; 肖东
Original assignee: Chongqing Yuanli Technology Co ltd
Current assignee: Chongqing Yuanli Technology Co ltd
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2021-08-06
Anticipated expiration: 2030-11-18

Abstract

The utility model provides a methyl alcohol recycle system, including methyl alcohol backward flow jar, the methyl alcohol jar, the backwash pump, it is first, the second methyl alcohol pump, it is first, the second circulation pipeline, methyl alcohol backward flow jar forms the circulation through first circulation pipeline and backwash pump, and be equipped with first valve, a first return pipe links to each other with first circulation pipeline, to the methanol tower backward flow, a connecting pipe links to each other with first circulation pipe, supply methyl alcohol to the methyl alcohol jar, the methyl alcohol jar forms the circulation through second circulation pipeline and first methyl alcohol pump, and be equipped with the fourth valve, a second return pipe links to each other with the second circulation pipeline, to the flash column backward flow, the inlet of second methyl alcohol pump is used for linking to each other with the methyl alcohol source, the leakage fluid dram links to each other with the methyl alcohol jar through first pipeline respectively, the second pipeline links to each other with the second return pipe, the second pipeline is located the low reaches of fifth valve, and be equipped with the eighth valve. The utility model has the advantages of being simple in structure and convenient in operation, the excessive liquid phase methyl alcohol of effective recycle methanol tower exhaust, and work efficiency is high, satisfies the actual demand of enterprise.

Description

Methanol recycling system

Technical Field

The utility model relates to a chemical industry field, in particular to methyl alcohol recycle system.

Background

After methanol steam discharged from the top of the methanol tower matched with a chemical enterprise and used is condensed into liquid by a tower top heat exchanger, the liquid methanol steam enters a methanol reflux tank through a pipeline, and then the liquid methanol is pumped back to the methanol tower by a reflux pump to form reflux. Under special conditions, more methanol steam is discharged from the methanol tower, excessive liquid methanol is formed by condensation, and the excessive methanol is discharged into the methanol reflux tank, and the excessive methanol can be discharged to a torch for combustion only through an emptying pipe arranged at the top of the methanol reflux tank, so that the serious waste of raw materials is caused.

In addition, a flash tower is arranged in a factory area of a chemical enterprise and used for flash separation of DMA materials, methanol obtained through separation is discharged from the top of the tower, and DMA obtained through separation is discharged from the bottom of the tower to a storage tank 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, a reflux system matched with a methanol tower and a methanol reflux system matched with a flash tower are mutually independent, and the utilization efficiency of methanol is low.

Disclosure of Invention

The utility model aims at prior art not enough, provide a methyl alcohol recycle system, its simple structure, convenient operation, the excessive liquid phase methyl alcohol of effective recycle methanol tower exhaust, and work efficiency is high, satisfies the actual demand of enterprise.

The technical scheme of the utility model is that: a methanol recycling system comprises a methanol reflux tank, a methanol tank, a reflux pump, a first methanol pump, a second methanol pump, a first circulating pipeline and a second circulating pipeline, wherein a feeding pipe is arranged on the side wall of the methanol reflux tank and is used for being connected with a liquid phase outlet of a heat exchanger on the top of a methanol tower, one end of the first circulating pipeline is connected with the bottom of the methanol reflux tank, the other end of the first circulating pipeline is connected with the top of the methanol reflux tank, a first valve is arranged on the first circulating pipeline, the reflux pump is arranged on the first circulating pipeline and is positioned at the upstream of the first valve, the upstream end of the first reflux pipe is connected with the first circulating pipeline and is positioned between the reflux pump and the first valve, the downstream end of the first reflux pipe is used for being connected with the side wall of the methanol tower for refluxing the methanol tower, a second valve is arranged on the first reflux pipe, and the upstream end of a connecting pipe is connected with the first circulating pipe, the downstream end of the connecting pipe is connected with the methanol tank, the connecting pipe is provided with a third valve, one end of a second circulating pipeline is connected with the bottom of the methanol tank, the other end of the second circulating pipeline is connected with the top of the methanol tank, the second circulating pipeline is provided with a fourth valve, the first methanol pump is arranged on the second circulating pipeline and is positioned at the upstream of the fourth valve, the upstream end of a second return pipe is connected with the second circulating pipeline and is positioned between the first methanol pump and the fourth valve, the downstream end of the second return pipe is used for being connected with the side wall of the flash tower to return to the flash tower, the second return pipe is provided with a fifth valve, the upstream ends of at least two liquid discharge pipes are connected with the second circulating pipeline and are positioned between the first methanol pump and the fourth valve, each liquid discharge pipe is respectively provided with a sixth valve, and the liquid inlet of the second methanol pump is used for being connected with a methanol source, and a liquid outlet of the second methanol pump is connected with the methanol tank through a first pipeline, a second pipeline is connected with a second return pipe, the first pipeline is provided with a seventh valve, and the second pipeline is positioned at the downstream of the fifth valve and is provided with an eighth valve.

And the downstream end of the connecting pipe is connected with the second circulating pipeline and is positioned at the downstream of the fourth 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.

The flow rate of the first methanol pump is larger than that of the second methanol pump.

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

the methanol recycling system comprises a methanol reflux tank, a methanol tank, a reflux pump, a first methanol pump, a second methanol pump, a first circulating pipeline and a second circulating pipeline. The lateral wall of methanol reflux tank is equipped with the inlet pipe for link to each other with the liquid phase export of methanol tower top heat exchanger, also promptly, the liquid phase methyl alcohol that the cooling of methanol tower top heat exchanger obtained is kept in entering methanol reflux tank through the inlet pipe. One end of the first circulation pipeline is connected with the bottom of the methanol reflux tank, the other end of the first circulation pipeline is connected with the top of the methanol reflux tank, a first valve is arranged on the first circulation pipeline, the reflux pump is arranged on the first circulation pipeline and located at the upstream of the first valve, and liquid methanol in the methanol reflux tank is circulated between the reflux pump and the methanol reflux tank by opening the first valve and the reflux pump. The upstream end of a first return pipe links to each other with first circulation pipeline, is located between backwash pump, the first valve, and the low reaches end of this first return pipe is used for linking to each other with the lateral wall of methanol tower, to methanol tower backward flow, be equipped with the second valve on the first return pipe, through the aperture of controlling first valve, second valve, can realize adjusting circulation flow, reflux flow's purpose, satisfies the actual demand of enterprise. The upstream end of a connecting pipe links to each other with first circulating pipe, is located between backwash pump, the first valve, and the downstream end of this connecting pipe links to each other with the methanol tank, be equipped with the third valve on the connecting pipe, when the liquid phase methanol volume of top of the tower heat exchanger exhaust is great, through the aperture of rationally opening first valve, second valve, third valve, make the liquid methanol reflux of part (including for zero or whole condition) to the methanol tower, as the backwash liquid, the liquid methanol of part (including for zero or whole condition) is arranged to the methanol tank and is regarded as raw materials or backwash liquid, avoids extravagant excessive methanol, effectively improves the liquid methanol circulation of the utilization ratio part (including for zero or whole condition) of methanol, can effectively satisfy the demand of enterprise. One end of the second circulation pipeline is connected with the bottom of the methanol tank, the other end of the second circulation pipeline is connected with the top of the methanol tank, a fourth valve is arranged on the second circulation pipeline, the first methanol pump is arranged on the second circulation pipeline and located at the upstream of the fourth valve, and the fourth valve and the first methanol pump are opened to enable methanol in the methanol tank to circulate between the methanol tank and the first methanol pump. The upstream end of a second back flow pipe links to each other with the second circulation pipeline, is located between first methanol pump, the fourth valve, and the downstream end of this second back flow pipe is used for linking to each other with the lateral wall of flash column, to the flash column backward flow, be equipped with the fifth valve on the second back flow pipe, through opening fourth valve, fifth valve, can realize adjusting the purpose of second back flow, second circulation pipe flow, provide the backwash liquid to the flash column. The upstream ends of at least two fluid-discharge tubes are connected with the second circulation pipeline, are located between first methanol pump, the fourth valve, are equipped with the sixth valve on each fluid-discharge tube respectively, when needs provide methyl alcohol as raw materials or medium to other equipment in chemical plant area, through opening the sixth valve on the fluid-discharge tube that corresponds, accessible fluid-discharge tube externally discharges methyl alcohol, satisfies the actual demand of enterprise. 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 a second return pipe, a seventh valve is arranged on the first pipeline, the second pipeline is positioned at the downstream of the fifth valve and is provided with an eighth valve, the methanol tank can be supplemented with methanol through opening the seventh valve by the second methanol pump, and the reflux liquid is prepared by closing the seventh valve and opening the eighth valve to provide methanol as reflux liquid for the flash tower. Other equipment in the factory provide methyl alcohol at needs, perhaps need be simultaneously when providing methyl alcohol reflux to the flash tank, open the great first methyl alcohol pump of flow, the realization is external to provide methyl alcohol, the purpose of providing methyl alcohol reflux to the flash tower, effectively satisfy the actual demand of enterprise, and the high-usage of first methyl alcohol pump, when only needing to provide the reflux to the flash tower, open the second methyl alcohol pump, supplement methyl alcohol to the methyl alcohol jar through first pipeline, provide methyl alcohol reflux to the flash tank through the second pipeline simultaneously, and the supplementary flow of methyl alcohol jar and the reflux flow of flash tank are all controllable, effectively satisfy the actual demand of enterprise, and reflux power is low, still accord with energy-concerving and environment-protective requirement.

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 reflux tank, 2 is a methanol tank, 3 is a reflux pump, 4 is a first methanol pump, 5 is a second methanol pump, 6 is a first circulation pipeline, 7 is a second circulation pipeline, 8 is a feeding pipe, 9 is a first reflux pipe, 10 is a connecting pipe, 11 is a second reflux pipe, 12 is a liquid discharge pipe, 13 is a first pipeline, 14 is a second pipeline, a is a first valve, b is a second valve, c is a third valve, d is a fourth valve, e is a fifth valve, f is a sixth valve, g is a seventh valve, and h is an eighth 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, a methanol recycling system comprises a methanol reflux tank 1, a methanol tank 2, a reflux pump 3, a first methanol pump 4, a second methanol pump 5, a first circulation pipeline 6 and a second circulation pipeline 7, wherein the methanol reflux tank adopts a horizontal tank, the methanol tank adopts a vertical tank, and the flow rate of the first methanol pump 4 is greater than that of the second methanol pump 5. The lateral wall of methanol reflux tank 1 is equipped with inlet pipe 8 for link to each other with the liquid phase export of methanol tower top heat exchanger. One end of the first circulation pipeline 6 is connected with the bottom of the methanol reflux tank 1, the other end of the first circulation pipeline is connected with the top of the methanol reflux tank 1, a first valve a is arranged on the first circulation pipeline 6, and the reflux pump 3 is arranged on the first circulation pipeline 6 and located at the upstream of the first valve a. The upstream end of a first return pipe 9 links to each other with first circulating line 6, is located between backwash pump 3, the first valve a, and the downstream end of this first return pipe 9 is used for linking to each other with the lateral wall of methanol tower, to methanol tower backward flow, be equipped with second valve b on the first return pipe 9. The upstream end of a connecting pipe 10 is connected with the first circulating pipe 6 and is positioned between the reflux pump 3 and the first valve a, the downstream end of the connecting pipe 10 is connected with the methanol tank 2, and the connecting pipe 10 is provided with a third valve c. One end of the second circulation pipeline 7 is connected with the bottom of the methanol tank 2, the other end of the second circulation pipeline is connected with the top of the methanol tank 2, a fourth valve d is arranged on the second circulation pipeline 7, the first methanol pump 4 is arranged on the second circulation pipeline 7 and located at the upstream of the fourth valve d, and specifically, the downstream end of the connecting pipe 10 is connected with the second circulation pipeline 7 and located at the downstream of the fourth valve d. The upstream end of a second return pipe 11 is connected with the second circulation pipeline 7 and is positioned between the first methanol pump 4 and the fourth valve d, the downstream end of the second return pipe 11 is used for being connected with the side wall of the flash tower to reflux the flash tower, and the second return pipe 11 is provided with a fifth valve e. The upstream ends of at least two liquid discharge pipes 12 are connected with second circulation pipeline 7, and are located between first methanol pump 4 and fourth valve d, and each liquid discharge pipe 12 is equipped with sixth valve f respectively, and in this embodiment, the quantity of liquid discharge pipe is two, and one of them liquid discharge pipe is used for providing methyl alcohol to the dissolving kettle, and another liquid discharge pipe is used for being connected with the methyl alcohol source. The liquid inlet of the second methanol pump 5 is used for being connected with a methanol source, the liquid outlet of the second methanol pump 5 is respectively connected with the methanol tank 2 through a first pipeline 13, a second pipeline 14 is connected with a second return pipe 11, a seventh valve g is arranged on the first pipeline 13, and the second pipeline 14 is positioned at the downstream of the fifth valve e and is provided with an eighth valve h.

The utility model discloses a theory of operation does, under the general condition, methanol tower top of the tower heat exchanger exhaust liquid phase methyl alcohol gets into the methyl alcohol backward flow jar through the inlet pipe, keeps in, opens the backwash pump, and controls the aperture of first valve, second valve, makes partial methyl alcohol return to the methanol-methanol tower through first backwash pipe, as the backwash liquid, partial liquid phase methyl alcohol circulates between methyl alcohol backward flow jar, backwash pump. When the liquid phase methanol discharged by the top heat exchanger of the methanol tower is excessive, the opening degree of the first valve, the second valve and the third valve is controlled, so that part of the liquid phase methanol returns to the methanol tower through the first reflux pipe to be used as reflux liquid, part of the liquid phase methanol circulates between the methanol reflux tank and the reflux pump, and part of the liquid phase methanol enters the methanol tank through the connecting pipe to be temporarily stored. The liquid phase methanol temporarily stored in the methanol tank can be discharged to a material tank requiring methanol in a chemical plant area through a liquid discharge pipe to be used as a material, such as a dissolving kettle. 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 fourth valve, the fifth valve, correspond the aperture of fluid-discharge tube sixth valve, provide methyl alcohol as the reflux to the flash column through the second reflux pipe, to other equipment through the fluid-discharge tube, provide methyl alcohol as raw materials or carrier like 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 seventh valve, eighth 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

1. A methanol recycling system is characterized in that: comprises a methanol reflux tank (1), a methanol tank (2), a reflux pump (3), a first methanol pump (4), a second methanol pump (5), a first circulating pipeline (6) and a second circulating pipeline (7),

the side wall of the methanol reflux tank (1) is provided with a feeding pipe (8) which is used for being connected with a liquid phase outlet of a top heat exchanger of the methanol tower,

one end of the first circulating pipeline (6) is connected with the bottom of the methanol reflux tank (1), the other end of the first circulating pipeline is connected with the top of the methanol reflux tank (1), a first valve (a) is arranged on the first circulating pipeline (6), the reflux pump (3) is arranged on the first circulating pipeline (6) and is positioned at the upstream of the first valve (a),

the upstream end of a first return pipe (9) is connected with a first circulating pipeline (6) and is positioned between the return pump (3) and the first valve (a), the downstream end of the first return pipe (9) is used for being connected with the side wall of the methanol tower to reflux the methanol tower, the first return pipe (9) is provided with a second valve (b),

the upstream end of a connecting pipe (10) is connected with the first circulating pipeline (6) and is positioned between the reflux pump (3) and the first valve (a), the downstream end of the connecting pipe (10) is connected with the methanol tank (2), the connecting pipe (10) is provided with a third valve (c),

one end of the second circulating pipeline (7) is connected with the bottom of the methanol tank (2), the other end of the second circulating pipeline is connected with the top of the methanol tank (2), a fourth valve (d) is arranged on the second circulating pipeline (7), the first methanol pump (4) is arranged on the second circulating pipeline (7) and is positioned at the upstream of the fourth valve (d),

the upstream end of a second return pipe (11) is connected with the second circulating pipeline (7) and is positioned between the first methanol pump (4) and the fourth valve (d), the downstream end of the second return pipe (11) is used for being connected with the side wall of the flash tower to return to the flash tower, the second return pipe (11) is provided with a fifth valve (e),

the upstream ends of at least two liquid discharge pipes (12) are connected with the second circulating pipeline (7) and are positioned between the first methanol pump (4) and the fourth valve (d), each liquid discharge pipe (12) is respectively provided with a sixth valve (f),

the liquid inlet of the second methanol pump (5) is used for being connected with a methanol source, the liquid outlet of the second methanol pump (5) is respectively connected with the methanol tank (2) through a first pipeline (13), a second pipeline (14) is connected with a second return pipe (11), a seventh valve (g) is arranged on the first pipeline (13), and the second pipeline (14) is located at the downstream of the fifth valve (e) and is provided with an eighth valve (h).

2. The methanol recycling system according to claim 1, characterized in that: the downstream end of the connecting pipe (10) is connected with the second circulating pipeline (7) and is positioned at the downstream of the fourth valve (d).

3. The methanol recycling system according to claim 1, characterized in that: the number of the liquid discharge pipes (12) 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 methanol recycling system according to claim 1, characterized in that: the flow rate of the first methanol pump (4) is greater than the flow rate of the second methanol pump (5).