CN1026120C

CN1026120C - Pyrolysis heater

Info

Publication number: CN1026120C
Application number: CN92104888A
Authority: CN
Inventors: J·M·费尔南德斯·鲍吉; J·V·奥尔巴诺
Original assignee: ABB Lummus Crest Inc
Current assignee: CB&I Technology Inc
Priority date: 1991-06-17
Filing date: 1992-06-17
Publication date: 1994-10-05
Anticipated expiration: 2007-06-17
Also published as: JPH05186779A; CN1067669A; KR930000654A; EP0519230A1; KR950005680B1; JPH0613710B2

Abstract

Pyrolysis heater 10 in which vertical tubes 14 in the radiant section are provided in a plurality of parallel rows, with each row being in a plane perpendicular to a plane through the longitudinal axis of the convection section of the heater. The radiant section is preferably in the form of cube and the tubes are heated by floor burners in rows parallel to the tubes.

Description

Pyrolysis heater

The present invention relates to a kind ofly, be cracked into better simply unit in order to hydrocarbon molecule with complexity through improved pyrolysis heater.

The example of prior art pyrolysis heater has the United States Patent (USP) 3,274,978 that is presented to people such as E.H.Palchik, and this pyrolysis heater has two radiation heating districts side by side, and top, two radiation heating districts disposes single convective region.The pipe row of a plurality of arranged perpendicular is by the high-level radiation burner heating of a plurality of vertical one-tenth row configuration on each wall of radiation heating district.

According to one aspect of the present invention, the invention provides a kind of such pyrolysis heater, this pyrolysis heater has a radiation heating section and a convective heating section, the convective heating section is positioned at radiation heating section top, depart from the radiation heating section, air-flow can circulate between convective heating section and radiation heating section.

The radiation heating section is equipped with at least two row vertical tubes, and the vertical tube in each row is all in the single plane perpendicular to the vertical plane that passes through the convection zone longitudinal center line.

The base plate of radiation section is provided with a plurality of radiation burners, and each side of each tubulation has a row burner.

Radiation section is preferably got such form, the length that makes the width of radiation section and radiation section about equally, that is, the width of radiation section is 80% to 120% of a radiation section length, preferably 90% of length to 110%.

In a recommendable especially embodiment, the height of radiation section also with the length of radiation section about equally, thereby radiation section is cube basically.

Each pipe in each row can dispose to such an extent that make it form one or more paths that supply the material stream passed in each pipe of feeding to use (pipe that forms one or more paths is called " pipe row "), and the pipe of each row can comprise one or more pipe rows.

For example, for example, in one embodiment, two single-row pipes can interconnect and form two vertical channels by radiation section (bilateral deferent row), and such row can have a plurality of bilateral deferent rows.Equally, can interconnect three or more pipes forms three or more path by the radiation heating section, and each row can have one, two or more such pipe row.When manufacturing had the pipe row of two or more paths, a plurality of pipes that form first channel can interconnect with the single tube that forms second passage.

Pipe in each row, internal diameter can be identical, also can be different.

Each pipe row of radiation section is used for carrying out short cracking of the residence time, produces (residence time was less than 0.5 second) that ethene is used.Usually, the residence time is not less than 0.07 second, thereby pipe row preferred design becomes to supply the residence time to be not more than 0.2 second usefulness.

A pipe row's of radiation section total length is 30 feet usually at least, and is no more than 80 feet usually, and the pipe row can be made of the suitable pipe of one or more length.Pipe row's total length, internal diameter and other condition all should cooperatively interact, to reach the requirement of above-mentioned short residence time(SRT).

According to a preferred embodiment, the height of process furnace (direction that is parallel to each pipe) is about 20 to 45 feet, simultaneously the length of process furnace and width as described above, its size has certain relation.

In a recommendable especially embodiment, 16 pipe rows (each pipe row can be made by one, two or more pipe) are arranged at least in the radiation section.

Each vertical tube that uses in the pyrolysis heater, its internal diameter are generally 1 inch to 4 inches, and the internal diameter of inlet tube is preferably 1 inch to 2 inches.In each pipe can be slick, also fin can be arranged.Pipe row's outlet pipe, its diameter can be bigger.

When each pipe is configured to pipe row and forms a plurality of passage, can dispose to such an extent that make many pipes each and every one can lead to material, simultaneously these many pipes form the single passages by radiation section, from entering a menifold that is connected with the bigger single tube of diameter after radiation zone comes out, with the second passage of formation by radiation section.

An embodiment shown in reference to the accompanying drawings further specifies content of the present invention below.

Fig. 1 is the rough schematic view of pyrolysis heater.

Fig. 2 is the rough schematic view of single-row pipe in the pyrolysis heater.

Each outlet of pipe row is preferably received in order to will flow out on the suitable feed-stock pipeline heat exchanger of expecting to be cooled to rapidly below the cracking temperature.

In some preferred embodiments, the temperature of arranging the outflow material that extracts from pipe is about 1400 °F to 1750 °F.

As in the art known, the material that feeds each pipe row is normally with the steam dilution.

Referring now to accompanying drawing.As we can see from the figure, pyrolysis heater 10 has a radiation section 11 and a convection zone 12, and convection zone 12 is above radiation section 11, and transverse runout radiation section 11, and air-flow can be by horizontal channel 13 circulation between radiation section 11 inside and convection zone 12.

Radiation section 11 comprises multiple row vertical tube 14, and each tubulation 14 is on the single plane of planar that is substantially perpendicular to the longitudinal center line by convection zone 12.As can see from Figure 1, vertical tube 14 has four row.

Radiation section 11 has a plurality of radiation burners 15 that are placed on its base plate.15 one-tenth row of each burner are arranged, and each row is parallel with respectively being listed as of vertical tube 14, and each tubulation 14 is equipped with two each side that is listed in burner 15, the one row vertical tubes 14 on the base plate that one row burner is arranged.Each burner of each side of vertical tube is best and each vertical tube is equidistant.Each vertical tube 14 in each row is interconnected, form the radiator tube row that the pyrolysis material is used.

As depicted in figs. 1 and 2, respectively managing in each row 14 disposed to such an extent that make it form two for the paths that the pyrolytic hydrocarbon flow is logical for the treatment of that feed.In more detail, form a line many pipe 14a are connected with

horizontal menifold

21, and 21 of horizontal menifolds are connected greater than the vertical tube 14b that manages 14a with internal diameter.Each upper end of managing 14a is connected with inlet menifold 22, and for the hydrocarbon material is fed the usefulness of respectively managing 14a, each top of managing 14b then is connected with feed-stock pipeline heat exchanger 23, flows out the usefulness of material for receiving pyrolysis.Like this, as shown in FIG., treat that pyrolytic hydrocarbon material feeds the top of respectively managing 14a, down send into menifold 21, upwards by each pipe 14b, introduce in the feed-stock pipeline heat exchanger 23 then by each pipe 14a.As in the art known, treat the pyrolytic material can each convection tubes 24 at convection zone 12 in preheating, the material of preheating is introduced by each menifold 22 respectively managed among the 14a simultaneously.

For example, for example, single-row vertical tube can be divided into two groups of pipes, each group pipe forms a pipe row.Each pipe row is made up of 12 pipe 14a that form first channel, and each 12 pipe 14a is connected with the single tube 14b that forms second passage.

In a preferred embodiment, the height length and the width of radiation section 11 are equal to each other.

Though what illustrate here is a process furnace that has single radiation section, it is a kind of that process furnace also can be made with two radiation sections that, and air-flow can circulate between each radiation section and convection zone.

Claims

1, a kind of pyrolysis heater comprises:

A radiation section is limited by a wall portion and a base plate;

A convection zone is limited by the wall portion that is positioned at said radiation section top;

Separating device is in order to separate the air-flow between convection zone and the radiation section;

At least two row vertical tubes are arranged in the described radiation section, and this at least two row vertical tube is parallel each other in perpendicular to a plane, one of plane by described convection zone longitudinal center line,

A plurality of radiation burners are positioned at and are parallel to said at least two row vertical tube arows on the base plate of radiation section and arrange, make said each row vertical tube that the side of the first row burner at this row vertical tube be arranged; And the opposite side of secondary series burner in this row vertical tube arranged, between each tubulation, be provided with two row burners at least thereby make, the width that said radiation is estimated basically with the equal in length of this radiation section;

The feed gatherer is in order to import vertical tube with feed; With

The product withdrawing device is in order to extract resultant out from vertical tube.

2, process furnace as claimed in claim 1 is characterized in that, said pipe joins into a plurality of pipes row mutually in single row, and each pipe drains into and has two vertical channels by radiation section less.