KR101631284B1 - Method for constructing peep hole insulation of pyrolysis heater - Google Patents

Abstract

TECHNICAL FIELD The present invention relates to a pyrolysis heater, which is an indispensable facility for a naphtha cracking process for producing ethylene and propylene as petroleum chemical raw materials, and more particularly, to a method for constructing an insulation monitoring window for observing the internal state of a pyrolysis heater will be.
The present invention provides a method of manufacturing a pyrolysis heater, comprising the steps of: constructing a heat insulation wall (20) by using a refractory, thermal brick on the inner wall surface of a pyrolysis heater to form a space (S) (C2) which extends from the front surface of the building wall to the inside of the heater while communicating with the monitoring hole on a horizontal line, And cutting the monitoring window building brick inside the pyrolysis heater so as to form the monitoring window building brick; The step of constructing the building wall includes the step of laminating the monitoring window building brick so that a preliminary communication hole communicating with the monitoring hole is formed at the center of the building wall; The step of laminating the monitoring window building bricks so that the preliminary communication holes are formed includes the steps of positioning the first monitoring window building bricks at the center of the position where the preliminary communication holes are to be formed, Placing a second monitoring window building brick at a position where an edge is to be formed; stacking a monitoring window building brick on the first monitoring window building brick and the second monitoring window building brick; And then removing the first monitoring window building brick after completion of the first monitoring window building brick.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a method for constructing a pyrolysis heater,

TECHNICAL FIELD The present invention relates to a pyrolysis heater, which is an indispensable facility for a naphtha cracking process for producing ethylene and propylene as petroleum chemical raw materials, and more particularly, to a method for constructing an insulation monitoring window for observing the internal state of a pyrolysis heater will be.

In general, the types of petrochemical plants include Atmospheric Distillation Unit, Vacuum Distillation Unit, Hydrodesulfurization Unit (HDS Unit), Hydrotreating & Cracking Unit, (EB / SM Unit), Naphtha Decomposition Process (NCC Unit), Pty. Ltd., and the like. In addition to the P & E process (PTA & PA Unit), hydrogen and ammonia synthesis gas process (Hydrogen & Ammonia Unit), there are gas processing and LNG related facilities.

The double naphtha cracking process consists largely of a process of cracking naphtha (cracking heater) and a process of separating ethylene and propylene gas obtained by pyrolysis.

In order to perform the pyrolysis process, it is necessary to install a pyrolysis heater capable of heating up to about 1100 ° C. so that the carbon connecting ring of naphtha can be cracked.

As shown in FIG. 1, since the pyrolysis heater 10 is operated at a high temperature, the pyrolysis heater 10 is finished with a heat insulating material having excellent performance. A plurality of heat insulation monitoring windows (1) are provided on the side of the heater (10) so that the operator can visually confirm the operation state of the heater (10), the naphtha coil state,

And reference numerals B and C are reinforced refractories adjacent to the monitoring hole A, respectively.

The conventional thermal insulation monitoring window 1 is constructed in the following manner.

First, as shown in Fig. 2A, the heat insulating wall 20 is formed on the inner wall surface of the pyrolysis heater 10 by using refractory bricks. The heat insulating wall 20 is formed so as to have a space S maintaining a certain distance from the edge of the monitoring hole A.

Then, as shown in FIG. 2B, a precast structure 40 made of a castable material is inserted into the space portion. The precast structure 40 is formed with a communication hole 41 communicating with the monitoring hole A in a horizontal line on the center of the precast structure 40. The communication hole 41 serves to improve the visibility of the inside of the heater 10 The heater 10 is extended to the inside of the heater 10.

2C, a ceramic blanket 50 is inserted between the pre-cast structure 40 and the outer wall surface of the heater 10 to a thickness of about 10 mm to 12 mm to form the pre-cast structure 40, So that it acts as an expansion bulb capable of buffering when expanding and shrinking heat.

2 (d), a door 60 capable of selectively opening and closing the monitoring hole A is provided outside the pyrolysis heater 10. As shown in Fig. The door (60) is made of the same steel material as the surface of the pyrolysis heater (10).

However, the thermal insulation monitoring window 1 constructed by the precast method is advantageous in that the castable which constitutes the precast structure 40 is superior in physical formability and fire resistance. However, since the heat insulating property is low and the thermal conductivity is high, There is a problem that it is susceptible to damage due to thermal shock and spoiling which are generated when opening /

Particularly, the castable structure 40 and the refractory bricks have different coefficients of thermal expansion from each other due to mutual thermal expansion coefficients being different from each other. Therefore, structural damage occurs early after the construction, and cracks are generated in various places of the insulation monitoring window (1).

As shown in FIG. 2E, once a crack is generated in the thermal insulation monitoring window 1, the generated crack propagates at a high speed, so that the thermal insulation performance of the thermal insulation monitoring window 1, as well as the heating and pyrolysis ability, Eventually, the operation should be stopped and the insulation monitoring window (1) must be re-opened.

KR 10-0540004 B1

It is an object of the present invention to provide a method for constructing an insulation monitoring window of a pyrolysis heater which is excellent in thermal shock and spalling properties and does not cause cracking even in long-term use.

In order to achieve the above object, according to the present invention, there is provided a method of constructing a thermal insulation monitoring window of a pyrolysis heater, comprising the steps of: forming a pyrolysis heater on a pyrolysis heater, A step of laminating a monitoring window construction brick on the space portion to form a built-up wall; and a step of connecting the monitoring hole to the inside of the heater while communicating with the monitoring hole on the horizontal line, And cutting the monitoring window construction tile bricks so that a ball is formed; The step of constructing the building wall includes the step of laminating the monitoring window building brick so that a preliminary communication hole communicating with the monitoring hole is formed at the center of the building wall; The step of laminating the monitoring window building bricks so that the preliminary communication holes are formed includes the steps of positioning the first monitoring window building bricks at the center of the position where the preliminary communication holes are to be formed, Placing a second monitoring window building brick at a position where an edge is to be formed; stacking a monitoring window building brick on the first monitoring window building brick and the second monitoring window building brick; And removing the first monitoring window building brick after completion of the first monitoring window building brick.

In addition, the second monitoring window building blocks may have inclined surfaces that converge toward the monitoring hall, and the second monitoring window building block may be disposed such that the slopes face each other.

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The step of cutting the monitoring window construction tile bricks may include the steps of extending and cutting the upper and lower ends of the preliminary communication hole while extending the inclined surface to the upper and lower sides so that the height of the preliminary communication hole coincides with the height of the monitoring hole, The extended upper end and the extended lower end of the preliminary communication hole may be sloped so as to have an inclined face that converges toward the monitoring hole.

According to the present invention constructed as described above, since the heat insulating monitoring window made of a single material is cut by cutting the building wall formed of the fire-resistant and heat insulating brick with a saw, the conventional art in which the heat insulating monitoring window is constructed of a material different from the fire- Is excellent in thermal shock and spalling properties, so that cracks do not occur even in long-term use.

1 is a sectional view of a general pyrolysis heater.
FIGS. 2A to 2E are diagrams sequentially illustrating a process of installing a thermal insulation monitoring window of a general pyrolysis heater. FIG.
3 is a view showing a state in which a heat insulating wall having a space is formed according to a method of constructing a thermal insulation monitoring window of a pyrolysis heater according to the present invention.
4 is a view showing a state in which a building wall is formed in a space portion according to a method of constructing a thermal insulation monitoring window of a pyrolytic heater according to the present invention.
5 is a sectional view taken along the line V-V in Fig.
6 is a perspective view of a pyrolysis heater according to the present invention, in which the upper and lower ends of the preliminary communication hole are extended and cut, and the upper and lower ends of the extended preliminary communication hole are inclined to converge toward the monitoring hole And the upper and lower ends of the extended preliminary communication hole are obliquely cut.
7 is a view showing a state in which the lower end of the preliminary communication hole is extended and cut according to the method of constructing the thermal insulation monitoring window of the pyrolysis heater according to the present invention.
8 is a sectional view taken along the line VIII-VIII in Fig.
9 is a front view of a heat insulation monitoring window completed according to the method of constructing a thermal insulation monitoring window of a pyrolysis heater according to the present invention.

The features and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims are to be interpreted in accordance with the technical idea of the present invention based on the principle that the inventor can properly define the concept of the term in order to explain his invention in the best way. It must be interpreted in terms of meaning and concept.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. The same reference numerals are used for the same components, and only the different portions are described for the sake of clarity.

The thermal insulation monitoring window of the pyrolysis heater according to the present invention is constructed in the following manner by using a monitoring window construction brick, unlike the conventional one, which is constructed by the precast method.

As shown in FIG. 3, first, the heat insulating wall 20 is formed on the inner wall surface of the pyrolysis heater 10 by using the refractory heat insulating brick. The heat insulating wall 20 is formed so as to have a space S maintaining a certain distance from the edge of the monitoring hole A.

As shown in FIGS. 4 and 5, the monitoring window building brick 110 is stacked on the space S to construct the building wall 100. The monitoring window construction tile bricks 110 have substantially the same basic physical properties as the fireproof insulation bricks constituting the insulation wall 20 and have excellent spalling properties.

And reference numerals B and C are reinforced refractories adjacent to the monitoring hole A, respectively.

If the insulation monitoring window, which was constructed by inserting a precast structure made of castable into the space of the heat insulating wall, is damaged as described in the related art and is reworked, the damaged precast structure is removed It is sufficient to construct the building wall 100 at the place where the precast structure is inserted.

It is preferable that the monitoring window construction brick is stacked so that a preliminary communication hole C1 communicating with the monitoring hole A on the horizontal line is formed at the center of the building wall 100. [

That is, when stacking the monitoring window construction bricks, the first monitoring window construction bricks 111 are positioned at the center of the position where the preliminary communication holes C1 are to be formed and the same layer as the first monitoring window construction bricks 111 The second monitoring window building brick 112 is positioned at a position where the edge of the building wall 100 is to be formed and then the first monitoring window building brick 112 and the second monitoring window building brick 112 Normally it is to stack monitoring bricks.

The first monitoring window construction tile block 111 is formed so that the inside of the preliminary communication hole C1 is tilted until the building wall 100 is completely cured so that the monitoring window construction tile brick stacked on the upper side is not collapsed toward the preliminary communication hole C1 side . The first monitoring window building brick 111 is removed after the building of the building wall 100 is completed.

Here, it is preferable that the second monitoring window building block bricks 112 have inclined surfaces 112a converging toward the monitoring hall A, respectively. In this case, the inclined surfaces 112a of the second monitoring window building bricks 112 face each other. This is because the inclined surface 112a becomes a cutting reference when cutting the monitoring window-formed brick with a saw, so that the cutting operation can be performed very easily and accurately.

The forming angle of the inclined surface 112a and other detailed dimensions are not particularly limited and may be changed according to requirements of the heater manufacturer.

When the building wall 100 having the preliminary communication hole C1 is completed as described above, the inner communication hole C1 is communicated with the monitoring hole A on a horizontal line, Use the top to cut the monitoring window bricks in stages.

6, the upper and lower ends of the preliminary communication hole C1 are extended and cut until the height of the preliminary communication hole C1 coincides with the height of the monitoring hole A, The upper and lower ends of the extended preliminary communication hole C1 are inclined so that the upper and lower ends of the preliminary communication hole C1 have an inclined face 112a converging toward the monitor hole A. [

More specifically, the operator inserts the saw into the preliminary communication hole C1 and, in a state in which the saw is in close contact with the inclined surface 112a of the second monitoring window construction brick 112, the top of the preliminary communication hole C1 The lower end is cut vertically to form a pair of mutually parallel cutting lines L converging toward the surveillance hole A on the front surface of the surveillance hole A, and thereafter, as shown in FIGS. 7 and 8, The lower region of the preliminary communication hole C1 is cut out step by step using a saw to extend and cut the lower end of the preliminary communication hole C1.

9, when the upper end of the preliminary communication hole C1 is extended and cut while gradually cutting the upper area D2 of the preliminary communication hole C1 using a saw, The cutting surfaces of the monitoring window molding bricks constituting the inner wall surface of the communication hole C2 are smoothly polished and then a door (not shown) capable of selectively opening and closing the monitoring hole A from the outside of the pyrolysis heater is installed The construction of the lower heat insulation monitoring window 2 is completed.

In the present embodiment, the lower end of the preliminary communication hole C1 is first expanded and cut and the upper end of the preliminary communication hole C1 is later expanded and cut. However, the upper end of the preliminary communication hole C1 The lower end of the preliminary communication hole C1 may be later extended and cut.

As described above, in the present invention, the insulating wall 2 can be constructed of a single material because the building wall 100 formed with the monitoring window construction tile brick is cut with a saw to form the communication hole C2.

In addition, since the thermal insulation monitoring window 2 constructed in accordance with the present invention is not only similar in composition to the heat insulating wall formed in the periphery, but also has excellent thermal shock and spalling properties, there is no cracking even in long-term use.

On the other hand, the monitoring window construction bricks constituting the thermal insulation monitoring window 2 of the present invention are larger in size than the fire-proofing insulation bricks used for the insulation walls formed at the edge of the monitoring hole A. This is because, in the case of constructing the building wall 100 with a small size monitoring window construction brick such as the existing refractory insulation brick, in the process of forming the communication hole C2 by cutting the monitoring window building brick with a saw, This is to prevent accidents that collapse while not being able to provide enough support between each other.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be takeners of ordinary skill in the art, And such variations are within the scope of the present invention.

2 ... insulation monitoring window 100 ... built wall
111 ... 1st monitoring window construction brick 112 ... 2nd monitoring window construction brick
112a ... slope A ... surveillance ball
C1 ... Preliminary communication hole C2 ... Communicating hole

Claims (5)

A step of forming a heat insulating wall on the inner wall surface of the pyrolysis heater so as to form a space portion for maintaining a certain distance from the edge of the monitoring hole formed on the side of the pyrolysis heater using the refractory thermal brick; And cutting the monitoring window building tile bricks so that a communication hole is formed on the front surface of the building wall so as to be communicated on a horizontal line with the inside of the heater,
The step of constructing the building wall includes the step of laminating the monitoring window building brick so that a preliminary communication hole communicating with the monitoring hole is formed at the center of the building wall;
The step of laminating the monitoring window building bricks so that the preliminary communication holes are formed includes the steps of positioning the first monitoring window building bricks at the center of the position where the preliminary communication holes are to be formed, Placing a second monitoring window building brick at a position where an edge is to be formed; stacking a monitoring window building brick on the first monitoring window building brick and the second monitoring window building brick; Wherein the step of removing the first monitoring window building brick after the completion of the first monitoring window building brick is completed. delete delete The method according to claim 1,
The second monitoring window construction bricks have inclined surfaces converging toward the monitoring holes,
Wherein the second monitoring window building bricks are arranged such that the inclined surfaces are opposed to each other. 5. The method of claim 4,
The step of cutting the monitoring window constructions bricks
Expanding the upper and lower ends of the preliminary communication hole while extending the inclined face to the upper and lower sides so that the height of the preliminary communication hole coincides with the height of the monitoring hole; And
And an extended upper end and an extended lower end of the preliminary communication hole are sloped so as to have an inclined face that converges toward the monitor hole, wherein the extended upper end and the extended lower end of the preliminary communication hole are inclined, Insulation Monitoring Window Construction Method.

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