CN212187853U

CN212187853U - Ethanol refining tower

Info

Publication number: CN212187853U
Application number: CN201921391719.7U
Authority: CN
Inventors: 王松
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-08-26
Filing date: 2019-08-26
Publication date: 2020-12-22
Anticipated expiration: 2029-08-26

Abstract

The utility model discloses an ethanol refining tower, which comprises a tower kettle clapboard and a rectifying tower with a local barrel body adopting an inner lining structure. The upper part of the ethanol refining tower adopts a plate type or packing type to refine the methanol; ethanol is extracted from the middle, and a demister is arranged at an outlet; the cylinder below the ethanol extraction port is lined with titanium material by carbon steel, and the titanium material and S31603 are adopted as internal parts, so that acetic acid corrosion is prevented; the tower kettle concentrates and separates ethanol and heavy components through a partition plate, and the ethanol and the heavy components are automatically discharged through a heavy component outlet, so that the aim of separating the ethanol, the methanol and the corrosive heavy components in a single tower is fulfilled. The utility model not only solves the single-tower refining of the ethanol product, but also overcomes the acetic acid corrosion problem which generally exists in the industry, and the equipment investment is saved by partially lining titanium.

Description

Ethanol refining tower

Technical Field

The utility model relates to a chemical industry field further relates to an ethanol refining tower.

Background

Ethanol, commonly known as ethanol, is an organic substance, of formula C₂H₆O is saturated monohydric alcohol with one hydroxyl group, and is a flammable, volatile, colorless and transparent liquid at normal temperature and normal pressure.

The ethanol gasoline is prepared by blending 90% of common gasoline and 10% of fuel ethanol, and the purity of the fuel ethanol directly determines the quality of oil products, so that the separation of ethanol is a crucial link in the process of producing the fuel ethanol, and an ethanol refining tower is also the key importance.

In the production process of ethanol, along with the generation of methanol, acetic acid, formic acid, ethyl formate and other byproducts, in complex components, the boiling points of methanol and ethanol are close, so that the separation difficulty is high, the acetic acid has strong corrosivity to carbon steel, and the material selection of equipment is complex, so that the equipment capable of effectively refining the ethanol is important equipment for industrial production of the ethanol.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an ethanol refining tower, methanol and other components in can effectively separating ethanol adopt carbon steel lining titanium structure in the part that acetic acid probably appears, and other parts adopt the carbon steel structure, have not only solved the acetic acid and have more saved the equipment investment to the corrosion problem of tower.

The technical scheme of the utility model as follows:

the upper part of the ethanol refining tower can adopt a packed tower or a plate tower. The lower part of the tower adopts a special structure and comprises a cylinder (7), a partition plate (11), a redistributor, a liquid receiving disc (6), a reboiler inlet and outlet (10) (1), an ethanol extraction outlet (9) and a heavy component outlet (12).

The main body of the cylinder (7) is made of carbon steel, the cylinder part below the ethanol extraction outlet is made of carbon steel lined with titanium, the internal part is made of titanium and S31603, the reboiling temperature of the tower is controlled below the boiling point of acetic acid, methanol and ethanol are evaporated by the reboiled material, a large amount of acetic acid is left in the tower kettle, and a small amount of acetic acid which is entrained and naturally evaporated is distilled back to the tower kettle after being separated by the tower section below the ethanol extraction outlet.

The concentration of the acetic acid in the tower kettle gradually increases, the amount of the acetic acid also increases, when the concentration of the acetic acid increases to exceed the partition plate (11), the acetic acid automatically flows into the chamber on the other side of the partition plate, and the liquid level in the chamber on the other side is automatically controlled by the liquid level regulating system.

The redistributor and the liquid receiving tray (6) belong to a part of a special structure of the equipment, and due to the existence of the partition plate in the tower kettle, descending liquid cannot directly enter the cavity of the partition plate, so that the descending liquid collected by the liquid receiving tray can enter the other end of the partition plate of the tower kettle through the downcomer below, and no descending liquid directly enters the cavity of the partition plate.

The reboiler inlet (10) and the reboiler outlet (1) are normally connected with the reboiler, but the titanium lining part is arranged outside a flange surface during processing and manufacturing, so that a corrosion medium is prevented from flowing out through a gap to directly corrode an external carbon steel framework; the reboiler export (10) designs according to reboiling volume size, and the reboiling volume of general condition ethanol all needs more than two mouths to work simultaneously, and the reboiler export becomes more than 90 degrees contained angles with the baffle cavity at least when designing the mouth of pipe position to set up the scour protection baffle, avoid the liquid phase in the gas-liquid two-phase flow after the reboiling directly to get into in the baffle cavity.

The ethanol extraction outlet (9) is used for extracting ethanol, the ethanol extraction outlet is provided with a demister, when a reboiler heats materials in the tower kettle to the boiling points of methanol and ethanol, the methanol and the ethanol are evaporated together, but along with mass transfer of the methanol and the ethanol gas phase and the condensed materials on the upper part of the tower, heat transfer is also carried out, the ethanol can be condensed and dynamically stays at a tower section between the tower kettle and the ethanol extraction outlet, the ethanol is extracted from the ethanol extraction outlet, and the methanol steam can continuously ascend to the top of the tower.

The heavy component outlet (12) is designed on the side, closest to the partition plate, of the partition plate cavity (D) in figure 2 (E), and the lowest point of the tower kettle cavity on the tower kettle end socket is used for discharging the acetic acid-containing most concentrated part in the tower kettle cavity in time, so that the corrosion is reduced while the heavy component is effectively extracted.

The utility model discloses an innovation does:

1) separating methanol, ethanol and heavy components containing acetic acid by using a tower;

2) separating heavy components containing acetic acid by using a tower kettle partition plate on the basis of a rectifying tower;

3) the tower kettle adopts a part of lining titanium material, thereby not only resisting the possible acetic acid corrosion, but also reducing the equipment investment.

Drawings

FIG. 1 is a schematic view of the lower part of an ethanol refining column

Wherein:

1: reboiler outlet 2: skirt 3: lower seal head

4: a manhole 5: ladder 6: liquid receiving plate

7: a cylinder 8: a demister 9: ethanol extraction outlet

10: reboiler inlet 11: separator 12: heavy fraction outlet

FIG. 2 is a schematic diagram of the positions of the column bottom partition and the heavy component outlet

Wherein:

a: reboiler inlet B: an outlet C of the reboiler: partition board

D: a clapboard cavity E: a heavy component outlet F: tower kettle cylinder

G: manhole (manhole)

Detailed Description

The present invention will be further described with reference to the following examples, but the present invention is not limited by the following examples.

Examples

Ethanol refining tower of 10 ten thousand ton/year ethanol device

The tower body is made of carbon steel, the thickness of the tower wall is 14mm, the structure of carbon steel lined with titanium is adopted downwards from the ethanol extraction port, the thickness of the lined titanium is 3mm, 500 efficient type regular silk screen packing is adopted at the upper part of the ethanol extraction port and is made of stainless steel, and 500 efficient type regular silk screen packing is adopted at the lower part of the ethanol extraction port and is made of titanium.

The tower kettle partition plate is made of titanium.

The outlet of the tower reboiler is divided into two paths to enter the ethanol refining tower, the two paths are arranged at 90 degrees, the baffle cavity is avoided, and an anti-impact baffle is arranged after the ethanol refining tower enters the tower.

The ethanol extraction port is provided with a wire mesh demister made of titanium.

The column operating pressure is: 0.05-0.2 MPaG, and the operation temperature is as follows: 70-130 ℃.

The separation effect is good, and the methanol, the ethanol and heavy components can be effectively separated, so that the ethanol yield is 99.5%.

Claims

1. An ethanol refining tower comprises a cylinder body, tower internals, a tower kettle partition plate, a redistributor, a liquid receiving disc, a reboiler inlet and a reboiler outlet, an ethanol extraction outlet and a heavy component outlet; the main body of the cylinder body is made of carbon steel, the part of the cylinder body below the ethanol extraction port is made of carbon steel lined with titanium, and the internal part is made of titanium and S31603; the tower bottom clapboard is of a single-plate structure, the shape of the bottom of the tower bottom clapboard is connected with that of the tower bottom head, the clapboard and the tower bottom head are welded fully without leakage, the shape and the size of a straight edge on the side surface of the tower are the same as those of a tower cylinder, the tower bottom head is welded fully without leakage, and the distance between the top of the clapboard and a reboiler return opening is more than 1.5 m; the redistributor and the liquid receiving disc are positioned at the top end of the reboiler return opening, the descending side of the liquid receiving disc is of a prototype notch downward-folding structure, the size of the notch is not more than 40% of the diameter of the liquid receiving disc, the notch is arranged in a position opposite to the tower kettle partition plate, the descending liquid collected by the liquid receiving disc enters the other end of the tower kettle partition plate from the descending side, and no descending liquid directly enters the cavity of the partition plate; the titanium lining part of the reboiler is required to be out of the flange surface when the reboiler inlet and the reboiler outlet are processed and manufactured, so that a corrosion medium is prevented from flowing out through a gap to directly corrode an external carbon steel framework; the size of a pipe orifice is adjusted by an inlet and an outlet of the reboiler according to the size of reboiling quantity, an included angle of more than 90 degrees is formed between the outlet of the reboiler and the partition plate cavity when the position of the pipe orifice is designed, and a scour prevention baffle is arranged to prevent liquid phase in reboiled gas-liquid two-phase flow from directly entering the partition plate cavity; a demister is arranged at an ethanol extraction port, and the demister is in a wire mesh form, and the wire mesh type is 10-100 meshes; and the connecting pipe is arranged on the side, close to the partition plate, of the partition plate cavity, is horizontally spaced from the partition plate by less than 50mm (including 50mm), and keeps the central position vertical to the partition plate, so that the heavy component can be effectively extracted and the corrosion is reduced.