KR20160015545A

KR20160015545A - Method and Apparatus for Drying Refractory of Boiler

Info

Publication number: KR20160015545A
Application number: KR1020140097881A
Authority: KR
Inventors: 이희직; 김진우
Original assignee: 두산중공업 주식회사
Priority date: 2014-07-31
Filing date: 2014-07-31
Publication date: 2016-02-15

Abstract

The present invention relates to a method and an apparatus for drying refractories of a boiler and, more specifically, to a method and an apparatus for drying refractories of a boiler which enables a meticulous dry temperature control even in a low-temperature drying area, and to reduce a normal operation start schedule by enabling to perform drying process in parallel with or independently with the initial firing step of a boiler, and to reduce drying costs such as fuel costs by replacing an independent heat source of a boiler which cannot control temperature exactly or an additional direct flame type heat source, and installing a heating module having a thermal radiation method type ceramic heating pad at a certain interval apart from an refractories placement area.

Description

TECHNICAL FIELD The present invention relates to a drying method and a drying apparatus for a boiler refractory,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drying method and a drying apparatus for a boiler refractory material, and more particularly, to a method of drying and refining a boiler refractory material by using a heat radiation heating module including a ceramic heating pad, And a method and apparatus for controlling the same.

There are structures in many industries that require the installation of refractories such as refractory bricks so that they are not softened even at high temperatures and that they retain their strength and can withstand chemical reactions. For example, a boiler facility for heating any material, such as a working vessel such as a ladle of steelmaking equipment or a reactor and regenerator of an oil refinery, is required to have refractory material installed on its inner wall.

The boiler having such a refractory structure is installed through a method of drying-out to remove the moisture absorbed in the refractory material after installing a refractory material resistant to high temperature to the inner wall of the boiler. This is because the refractory material usually contains about 15% moisture added to the dry ingredients, and the infiltration is applied.

At this time, the dry state of the refractory material will determine the life span of the refractory structure. For example, when the quality of construction and drying of the refractory material is poor, the refractory is partially dropped or worn out during the operation, hot spots due to local heating concentration on the inner wall of the boiler are generated, It may obstruct the connecting connection or interfere with the operation of the valve, which may interfere with the supply of the catalyst and the like, which may be a serious obstacle to safe operation.

On the other hand, when the boiler is installed and the refractory is poured and dried, the drying-out curve required for various refractories and boilers is determined. This drying condition refers to the temperature condition depending on the time required to perform the performance of the refractory material in forming the refractory structure on the inner wall of the boiler by using the refractory material.

Conventionally, a heat source provided by the boiler itself is used for drying the refractory material. Since the boiler is installed at a stage prior to the normal operation of the boiler, it is difficult to control the temperature at the same time as the initial firing and the drying step. The incomplete heat source conditions include a low-temperature drying zone of 300-400 ° C or less and a high-temperature drying zone of 400 ° C or more. In such a low temperature drying zone where more precise temperature control is required, And it was impossible to realize that the flame of the boiler burner was directly contacted, thus causing the thermal damage of the refractory material. In addition, if the boiler's own heat source is utilized for drying, it is not possible to perform the initial burning process and the fireproof material drying process in parallel.

Korean Patent Laid-Open No. 10-2010-0044550 (Method for drying refractory coated on the inner wall of reactor, catalyst regenerator and flue gas pipe of FCC process, published on Apr. 30, 2010), Korean Patent Laid- There has been an attempt to introduce a separate heat source such as a gas burner capable of relatively precise temperature control without using the boiler's own heat source, The possibility of thermal damage to the refractory material can not be excluded, and the drying cost is increased due to the consumption of the gaseous fuel, which is not economical and it is not sufficient to perform the uniform temperature distribution control enough to satisfy the dry-out curve.

Korean Patent Laid-Open No. 10-2010-0044550 (Method for drying refractory coated on the inner wall of a reactor, catalyst regenerator and flue gas pipe of FCC process, published on Apr. 30, 2010) Korean Patent Laid-Open Publication No. 10-2012-0023398 (Fireproof Drying Apparatus, published on March 13, 2012)

It is an object of the present invention to provide a heating module having a ceramic heating pad of a thermal radiation type in place of a boiler's own heat source which can not be precisely controlled in temperature, It is possible to precisely control the drying temperature even in the low temperature drying region and to perform the drying process in parallel with the initial burning process of the boiler in a parallel and independent manner, And to provide a drying method and a drying apparatus capable of drastically reducing drying cost such as fuel cost.

According to an aspect of the present invention, there is provided a method of drying a refractory poured into an inner wall of a boiler, the method comprising: installing at least one ceramic heating pad (11) (S10) for preparing a drying process by installing a thermal barrier heating module (10) on the inner wall of the boiler; A drying step (S20) of operating the heat-radiation heating module (10) to dry the refractory material; And a control step S30 of controlling the operation of the thermal barrier heating module 10. The thermal barrier heating module 10 includes at least one ceramic heating pad 11 toward the front of the metal jig 12, A method of drying a boiler refractory comprising the steps of: heating a ceramic heating pad (11) to prevent heat loss in a direction other than the front direction; and inserting a heat insulating material (13) on the metal jig (12) to provide.

At this time, in the preparation step S10, the thermal insulation and heating module 10 may be installed at a predetermined distance from the inner wall of the boiler in which the refractory material is installed, more specifically, 80 to 120 mm from the inner wall of the boiler Can be installed. Also, the drying step (S20) is preferably performed for a low-temperature drying region at a drying temperature of 400 ° C or lower.

The control step S30 may include calculating the total amount of heat for drying the refractory material placed on the inner wall of the boiler before the drying step S20 is performed, An initial control step (S31) of controlling time; Or during the drying step (S20), refractory material temperature information measured through at least one temperature sensor installed in the vicinity of the thermal barrier heating module (10) is collected and the operation temperature of the thermal barrier heating module (10) And a real-time control step (S32) of controlling the operation time in real time.

The insulating material 13 is made of mineral wool, glass wool, cerak wool, biocerak wool, rock wool and ceramic wool. And at least one selected from the group consisting of

According to another aspect of the present invention, there is provided an apparatus for drying a refractory poured into an inner wall of a boiler, the apparatus comprising: at least one ceramic heating pad (11) A thermal radiation heating module (10) for heating in a thermal radiation system; A heating unit for heating and cooling the heat-radiation heating module to a predetermined region of the inner wall of the boiler; A control unit for controlling an operation temperature and an operation time of the thermal radiation heating module; And at least one temperature sensor for collecting temperature information of the refractory material and transmitting the collected temperature information to the control unit, wherein the thermal barrier heating module (10) comprises at least one ceramic heating pad (11) toward the front of the metal jig (12) And a heat insulating material (13) is provided on the metal jig (12) so as to surround the ceramic heating pad (11) to prevent heat loss in a direction other than the front direction. Lt; / RTI >

At this time, it is preferable that the support base is installed such that the thermal radiation heating module 10 is spaced 80 to 120 mm from the predetermined area of the inner wall of the boiler in which the refractory material is installed.

As described above, the drying method of the boiler refractory according to the present invention can control the drying temperature even in a low-temperature drying region, so that the temperature distribution can be controlled to almost the same level as the required dry-out curve condition to secure the quality of the refractory And the drying process can be performed in parallel to the boiler first and independently, so that the normal operation start schedule can be greatly shortened and the drying cost of the fuel cost and the like can be drastically reduced.

FIG. 1 is a flow chart showing a method of drying a boiler refractory according to a preferred embodiment of the present invention.
2 is a heat radiation heating module 10 according to a preferred embodiment of the present invention.
3 is a heat radiation heating module 10 according to another preferred embodiment of the present invention.
4A is an example of a dry-out curve required for refractory material drying, FIG. 4A is a dry-out curve for a low-temperature drying region, FIG. to be.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Prior to the description, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and should be construed in accordance with the technical concept of the present invention.

Throughout this specification, when a member is " on " another member, this includes not only when the member is in contact with another member, but also when there is another member between the two members.

Throughout this specification, when an element is referred to as "including" an element, it is understood that it may include other elements as well, without departing from the other elements unless specifically stated otherwise.

The terms "first "," second ", and the like are intended to distinguish one element from another, and the scope of the right should not be limited by these terms. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

In each step, the identification code is used for convenience of explanation, and the identification code does not describe the order of the steps, and each step may be performed differently from the stated order unless clearly specified in the context. have. That is, each of the steps may be performed in the same order as described, or may be performed substantially concurrently or in the reverse order.

The present invention provides a method of drying a refractory material poured into an inner wall of a boiler. The drying method according to the present invention includes a preparation step (S10), a drying step (S20) and a control step (S30), and a flow chart thereof is shown in FIG.

The preparing step S10 of the present invention is a step of installing a heating device for heating the fireproof material on the inner wall of the boiler, that is, a heat-radiation heating module 10 in a casting area. At this time, the heat radiation heating module 10 is a heating device that converts electric energy into thermal radiation energy, and at least one ceramic heat generating pad 11 is installed to dry the refractory material through the heat radiation method.

Since it is a heat radiation type heating system, it is possible to suppress a phenomenon in which hot spots are generated due to local heat concentration as compared with a direct flame heating system, and temperature control is efficient and easy because it is an electric heating system.

Specifically, at least one ceramic heating pad 11 is installed toward the front of the metal jig 12, and a ceramic heating pad 11 (not shown) is installed to prevent heat loss in a direction other than the front. A method in which the insulating material 13 is provided on the metal jig 12 can be prepared. A heat radiation heating module 10 according to one embodiment of the present invention is shown in Figs. As shown in FIG. 2, the metal jig 12 may be provided in a square shape or may be provided in a shape similar to that shown in FIG. 3 according to the shape of the drying region.

The heat insulating material 13 is provided on the metal jig 12 so as to surround the ceramic heating pad 11. The heat generated in the ceramic heating pad 11 is transferred to the front of the metal jig 12, So that the heat can not escape in the other direction. The heat insulating material 13 may be made of various materials to perform this role and is preferably made of mineral wool, glass wool, cerak wool, biocerak wool, rock wool, and ceramic wool, and more preferably, mineral wool can be used.

The thermal insulation heating module 10 prepared in the preparing step S10 is installed in the refractory material placement area. It is preferable that the thermal insulation heating module 10 is installed at a predetermined distance from the inner wall of the boiler in which the refractory material is installed. If it is installed in a direct contact type rather than a spaced shape, the refractory will be heated in a baking form, so that water evaporation will not be efficiently performed, and various materials such as metal provided in the inner wall of the boiler itself will be deformed due to heating There is. The spacing distance is preferably 80-120 mm from the inner wall of the boiler. If the distance is less than 80 mm, the distance between the heat-radiation heating module 10 and the refractory may be too narrow. If the distance exceeds 120 mm, The heat can not be efficiently transmitted to the refractory side and the generated heat can be transferred to other areas other than the desired refractory pouring area through the space generated at the separation distance, thereby causing thermal damage to other areas or unnecessarily wasting drying operation cost can do.

When the preparing step S10 is completed, a full drying step S20 is performed. As described above, the step of drying the refractory material is divided into a low-temperature drying zone of 400 ° C or less and a high-temperature drying zone of 400 ° C or more. Since the refractory drying method of the present invention can control the temperature distribution more precisely in the low- It is effective to apply it. The heat-radiation heating module 10 of the present invention can be heated up to about 800 ° C, but since a relatively precise temperature control is not required in the high-temperature drying region, it is more efficient to utilize the heat source of the boiler itself. 4A is a dry-out curve according to one embodiment of the low temperature drying zone, and FIG. 4B is a dry-out curve according to one embodiment of the high temperature drying zone.

The degree of heating according to the thermal barrier heating module 10 can be predicted by calculating the total heat amount for drying the refractory material poured into the inner wall of the boiler before the drying step S10 is performed. Specifically, the total heat amount consumed for drying the fire-proof material in accordance with the required dry-out curve is calculated in consideration of the physical properties of the refractory material poured into the boiler inner wall, the thickness of the installed refractory material, And an initial control step S31 for controlling the operating temperature, the operating time, and the like.

Meanwhile, in the process of performing the drying step S10, the operation of the thermal barrier heating module 10 can be controlled according to the drying state of the refractory material in real time. Specifically, at least one temperature sensor (thermocouple) is installed near the heat radiation heating module 10, that is, at a predetermined position on the metal jig 12 or at a predetermined position on the inner wall of the boiler, and based on the real- And real-time control step S32 of controlling the operating temperature and operating time of the thermal insulation heating module 10 in real time by analyzing the state of the present refractory material.

By carrying out the drying step S20 together with the control step S30, the refractory material can be dried more efficiently in terms of the required period and cost.

According to another preferred embodiment of the present invention, the thermal radiation heating module 10 as described above, a support for fixing the thermal radiation heating module 10 to a predetermined region of the inner wall of the boiler, a controller for performing the control step S30 as described above, A boiler refractory drying apparatus including a sensor is provided.

The supporting base is a device for fixing the entire heat-resisting heating module 10 of the present invention fixedly on a predetermined area of the inner wall of the boiler in which the refractory material is installed, thereby stably performing the drying operation by the heat- 10 may be arranged to be adjustable as required, and may be spaced 80 to 120 mm apart from the predetermined area of the inner wall of the boiler so that the heat radiation heating module 10 can be installed.

The present invention is not limited to the above-described specific embodiment and description, and various changes and modifications may be made by those skilled in the art without departing from the scope of the present invention as claimed in the claims. And such modifications are within the scope of protection of the present invention.

10: Thermal radiation heating module
11: Ceramic heating pad
12: Metal jig
13: Insulation

Claims

A method of drying a refractory poured into an inner wall of a boiler,
(S10) a step of installing a heat-radiation heating module (10) which is equipped with at least one ceramic heating pad (11) and heating the refractory material by a thermal radiation method, on the inner wall of the boiler to prepare for drying;
A drying step (S20) of operating the heat-radiation heating module (10) to dry the refractory material; And
A control step (S30) of controlling the operation of the thermal radiation heating module (10);
/ RTI >
At least one ceramic heating pad 11 is installed toward the front of the metal jig 12 and the ceramic heating pad 11 is installed to prevent heat loss in a direction other than the front. And a heat insulating material (13) is provided on the metal jig (12).

The method according to claim 1,
In the preparing step S10,
Wherein the heat radiation heating module (10) is installed at a predetermined distance from the inner wall of the boiler in which the refractory material is installed.

3. The method of claim 2,
Wherein the heat radiation heating module (10) is installed at a distance of 80 to 120 mm from the inner wall of the boiler.

The method according to claim 1,
Wherein the drying step (S20) is performed for a low-temperature drying zone at a drying temperature of 400 ° C or less.

The method according to claim 1,
The control step (S30)
An initial control step (S31) of controlling the operating temperature and the operating time of the heat-radiation heating module (10) by calculating a total heat quantity for drying the refractory material poured into the boiler inner wall before the drying step (S20) Wherein said method comprises the steps of:

The method according to claim 1,
The control step (S30)
During the drying step (S20), refractory material temperature information measured through at least one temperature sensor installed in the vicinity of the thermal insulation and heating module (10) is collected and the operation temperature and operation temperature of the thermal insulation and heating module And a real-time control step (S32) of controlling the time in real time.

The method according to claim 1,
The insulating material 13 is made of mineral wool, glass wool, cerak wool, biocerak wool, rock wool and ceramic wool. Wherein the boiler refractory material is at least one selected from the group consisting of iron and steel.

An apparatus for drying a refractory poured into an inner wall of a boiler,
A heat-radiation heating module (10) mounted with at least one ceramic heating pad (11) to heat the refractory material by a thermal radiation method;
A heating unit for heating and cooling the heat-radiation heating module to a predetermined region of the inner wall of the boiler;
A control unit for controlling an operation temperature and an operation time of the thermal radiation heating module; And
At least one temperature sensor for collecting temperature information of the refractory material and transmitting the collected temperature information to the control unit;
/ RTI >
At least one ceramic heating pad 11 is installed toward the front of the metal jig 12 and the ceramic heating pad 11 is installed to prevent heat loss in a direction other than the front. And a heat insulating material (13) is provided on the metal jig (12).

9. The method of claim 8,
Wherein the support base is installed such that the heat-radiation heating module (10) is spaced 80 to 120 mm from a predetermined area of the inner wall of the boiler in which the refractory material is installed.