KR101108617B1 - Combustion waste gas heat recovery system in reheating furnace - Google Patents

Combustion waste gas heat recovery system in reheating furnace Download PDF

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KR101108617B1
KR101108617B1 KR1020040069816A KR20040069816A KR101108617B1 KR 101108617 B1 KR101108617 B1 KR 101108617B1 KR 1020040069816 A KR1020040069816 A KR 1020040069816A KR 20040069816 A KR20040069816 A KR 20040069816A KR 101108617 B1 KR101108617 B1 KR 101108617B1
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exhaust gas
combustion
temperature
furnace
combustion exhaust
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KR1020040069816A
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Korean (ko)
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KR20060021018A (en
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강덕홍
김기홍
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재단법인 포항산업과학연구원
주식회사 포스코
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/3005—Details, accessories, or equipment peculiar to furnaces of these types arrangements for circulating gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/04—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity adapted for treating the charge in vacuum or special atmosphere
    • F27B9/045—Furnaces with controlled atmosphere
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/36—Arrangements of heating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
    • F27D17/002—Details of the installations, e.g. fume conduits or seals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004—Systems for reclaiming waste heat
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Air Supply (AREA)

Abstract

본 발명은 소재를 압연하기에 적당한 온도로 가열하는 연속식 가열로에서 발생되는 연소배가스의 현열 회수 시스템에 관한 것으로,The present invention relates to a sensible heat recovery system of combustion flue gas generated in a continuous furnace for heating a material to a suitable temperature for rolling.

소재를 가열하기 위하여 장입대, 예열대, 가열대 및 균열대를 거치면서 발생된 가열로 내 고온의 연소배가스의 현열을 회수하기 위하여 열교환기를 사용하는 시스템에 있어서, 상기 열교환기를 통과하기 전의 고온의 연소배가스를 배출시키는 배가스 토출구; 상기 연소배가스의 온도와 기준 설정치의 온도를 비교하여 배가스 토출구 댐퍼의 개도를 조절하는 분산제어시스템; 상기 배가스 토출구로부터 유입되는 연소배가스에 의하여 내부에 적치된 장입 대기중인 소재를 예열하는 소재 예열기; 및 상기 소재 예열기와 배가스 순환라인으로 연결되어 저온의 연소배가스를 배출시키는 흡입팬을 포함하여 구성되어,In the system using a heat exchanger to recover the sensible heat of the hot combustion flue gas in the furnace generated through the charging, preheating, heating and cracking zone to heat the material, the hot combustion vessel before passing through the heat exchanger Exhaust gas discharge ports for discharging gas; A distributed control system for adjusting the opening degree of the exhaust gas discharge port damper by comparing the temperature of the combustion exhaust gas with a temperature of a reference set value; A material preheater for preheating the material waiting to be charged therein by the combustion exhaust gas flowing from the exhaust gas discharge port; And a suction fan connected to the material preheater and an exhaust gas circulation line to discharge the low temperature combustion exhaust gas.

기준 설정치 온도에 따라 배가스 토출구를 통하여 연소배가스를 선택적으로 배출하므로 희석팬의 가동율을 낮춤으로써 그에 따른 비용을 절감할 수 있으며, 연소배가스 현열을 이용하여 장입전 대기 소재의 예열함으로써 연소배가스의 회수 효율을 극대화할 수 있는 효과가 있게 된다.The combustion exhaust gas is selectively discharged through the exhaust gas discharge port according to the reference set point temperature, thereby reducing the operation cost of the dilution fan, and reducing the cost.The recovery efficiency of the combustion exhaust gas is achieved by preheating the atmospheric material before charging by using the combustion exhaust gas sensible heat. The effect is to maximize.

가열로, 배가스 토출구, 소재 예열기, 흡입팬 Furnace, exhaust gas outlet, material preheater, suction fan

Description

가열로 연소배가스의 현열 회수 시스템{Combustion waste gas heat recovery system in reheating furnace}Combustion waste gas heat recovery system in reheating furnace

도 1은 종래의 가열로와 현열 회수 시스템을 나타내는 구성도.1 is a configuration diagram showing a conventional heating furnace and sensible heat recovery system.

도 2는 본 발명에 따른 가열로 연소배가스의 현열 회수 시스템의 개략 구성도.Figure 2 is a schematic configuration diagram of a sensible heat recovery system of the furnace combustion exhaust gas in accordance with the present invention.

도 3은 본 발명의 현열 회수 시스템의 예열효과를 나타내는 그래프.Figure 3 is a graph showing the preheating effect of the sensible heat recovery system of the present invention.

< 도면의 주요부분에 대한 부호의 설명 >Description of the Related Art

1 : 가열로 2 : 소재1: heating furnace 2: material

8 : 희석팬 9 : 열전대8: dilution pan 9: thermocouple

10 : 열교환기 12 : DCS10: heat exchanger 12: DCS

21 : 배가스 토출구 22 : 댐퍼21: exhaust gas discharge port 22: damper

23 : 소재 예열기 24 : 순환라인23: material preheater 24: circulation line

25 : 흡입팬 26 : 배출구25: suction fan 26: outlet

본 발명은 소재를 압연하기에 적당한 온도로 가열하는 연속식 가열로에서 발 생되는 연소배가스의 현열 회수 시스템에 관한 것으로, 보다 상세하게는 고온의 연소배가스를 이용하여 소재를 예열함으로써 희석팬의 가동율을 저하시킴과 동시에 현열의 회수 효율을 향상시킬 수 있는 가열로 연소배가스의 현열 회수 시스템에 관한 것이다.The present invention relates to a sensible heat recovery system of combustion flue gas generated in a continuous furnace for heating the material to a suitable temperature for rolling the material, and more particularly, the operation rate of the dilution fan by preheating the material using a high temperature combustion flue gas. The present invention relates to a sensible heat recovery system of a combustion flue gas in a furnace capable of lowering the temperature and improving sensible heat recovery efficiency.

일반적으로 가열로에서는 발생되는 연소배가스는 950℃ 정도의 고온 가스로서 그 현열을 이용하기 위한 방법이 모색되어 왔다.In general, combustion flue gas generated in a heating furnace is a hot gas of about 950 ° C, and a method for using the sensible heat has been sought.

도 1의 종래의 가열로와 현열 회수 시스템을 나타내는 구성도에 도시된 바와 같이, 종래의 가열로에서는 예열대, 가열대, 균열대에서 연소되어 가열로(1)내의 소재(2)를 가열한 후 950℃ 정도의 연소배가스가 연도(6)를 통하여 열교환기(10)로 보내진다. 이때 열교환기(recuperator type의 열교환기 ; 10)의 재질제약조건에 의해 연소배가스 온도가 최대 940℃를 넘지 않도록 하기 위하여 연도(6)에 희석팬(dilution fan ; 8)이 설치되어 있다. 미설명된 도면 부호 3은 축류식 통상버너, 4는 사절벽, 5는 축열식 버너, 7은 빔, 11은 연돌이다.As shown in the block diagram showing the conventional heating furnace and the sensible heat recovery system of FIG. 1, in the conventional heating furnace, after burning in the preheating zone, the heating zone, and the cracking zone, the material 2 in the heating furnace 1 is heated. The combustion flue gas of about 950 ° C. is sent to the heat exchanger 10 through the flue 6. At this time, a dilution fan 8 is installed in the flue 6 so that the combustion exhaust gas temperature does not exceed a maximum of 940 ° C due to material constraints of the heat exchanger 10. Unexplained reference numeral 3 is an axial flow type burner, 4 is a trimming wall, 5 is a regenerative burner, 7 is a beam, 11 is a stack.

열전대(9)에 의하여 측정된 연소배가스 온도가 일정치를 넘어설 경우 분산제어시스템(Distributed Control System, 이하 'DCS'라 함 ; 12)에 의하여 희석팬(8)을 가동시켜 연도(6)를 지나가는 연소배가스 온도를 상온의 외기와 혼합시켜 적정 연소배가스 온도를 유지하여 열교환기(10)로 보내게 된다.When the flue gas temperature measured by the thermocouple 9 exceeds a certain value, the dilution fan 8 is operated by the distributed control system (hereinafter referred to as 'DCS'; The passing flue gas temperature is mixed with the outside air at room temperature to maintain the proper flue gas temperature and sent to the heat exchanger (10).

그런데 실제 조업에 있어서는 희석팬(8)의 개도율은 약 55%로 사용하고 있으며 이로 인하여 연소배가스 온도는 약 800℃ 정도로 떨어뜨려 열교환기(10)로 보내게 됨으로써 고온의 연소배가스의 현열을 최대한 회수하고 있지 못하며 오히려 외 기의 찬 공기를 가지고 희석시킴으로써 그 현열 회수 효율이 더 악화되는 실정이며, 이에 대한 적절한 현열 회수 방법의 강구가 필요하게 되었다.However, in actual operation, the opening ratio of the dilution fan 8 is used at about 55%. As a result, the combustion exhaust gas temperature is dropped to about 800 ° C. and sent to the heat exchanger 10 to maximize the sensible heat of the combustion gas at high temperature. Rather, the sensible heat recovery efficiency is worsened by diluting with cold air, which is not recovered. Therefore, it is necessary to devise an appropriate sensible heat recovery method.

본 발명은 상기와 같은 종래의 문제점을 해결하기 위하여 발명된 것으로, 가열로에서 발생되는 고온의 연소배가스의 현열을 최대한 회수하기 위하여 일정 온도 이상의 연소배가스를 소재의 예열에 사용하기 위한 가열로 연소배가스의 현열 회수 시스템을 제공함에 그 목적이 있다.The present invention has been invented to solve the conventional problems as described above, the furnace combustion exhaust gas for using the combustion exhaust gas of a predetermined temperature or more for preheating the material in order to recover the sensible heat of the high temperature combustion exhaust gas generated in the heating furnace to the maximum The purpose of the present invention is to provide a sensible heat recovery system.

상기의 목적을 달성하기 위한 본 발명의 가열로 연소배가스의 현열 회수 시스템은, 소재를 가열하기 위하여 장입대, 예열대, 가열대 및 균열대를 거치면서 발생된 가열로 내 고온의 연소배가스의 현열을 회수하기 위하여 열교환기를 사용하는 시스템에 있어서,The sensible heat recovery system of the furnace combustion flue gas of the present invention for achieving the above object, the sensible heat of the combustion flue gas of the high temperature in the furnace generated while passing through the charging, preheating, heating and cracking zone to heat the material. In a system using a heat exchanger to recover,

상기 열교환기를 통과하기 전의 고온의 연소배가스를 배출시키는 배가스 토출구; 상기 연소배가스의 온도와 기준 설정치의 온도를 비교하여 배가스 토출구 댐퍼의 개도를 조절하는 분산제어시스템; 상기 배가스 토출구로부터 유입되는 연소배가스에 의하여 내부에 적치된 장입 대기중인 소재를 예열하는 소재 예열기; 및 상기 소재 예열기와 배가스 순환라인으로 연결되어 저온의 연소배가스를 배출시키는 흡입팬을 포함하여 구성됨을 특징으로 한다.An exhaust gas discharge port for discharging high-temperature combustion exhaust gas before passing through the heat exchanger; A distributed control system for adjusting the opening degree of the exhaust gas discharge port damper by comparing the temperature of the combustion exhaust gas with a temperature of a reference set value; A material preheater for preheating the material waiting to be charged therein by the combustion exhaust gas flowing from the exhaust gas discharge port; And a suction fan connected to the material preheater and an exhaust gas circulation line for discharging low-temperature combustion exhaust gas.

또한 본 발명은, 상기 소재 예열기에 장입되는 대기 소재의 수는 가열로의 연소부하율에 따라 조절하는 것을 특징으로 한다. In addition, the present invention is characterized in that the number of atmospheric materials charged into the material preheater is adjusted according to the combustion load rate of the heating furnace.                     

이하에서는 본 발명의 구성에 대하여 첨부도면을 참조하여 설명하되, 본 발명의 구성 중 종래와 동일한 구성은 도 1에 기재된 도면 번호를 그대로 사용하기로 한다.Hereinafter, a configuration of the present invention will be described with reference to the accompanying drawings, but the same configuration as the conventional configuration of the present invention will use the reference numerals described in FIG. 1 as it is.

도 2는 본 발명에 따른 가열로 연소배가스의 현열 회수 시스템의 개략 구성도로서, 도시된 바와 같이, 장입대의 축열식 버너(5), 예열대, 가열대 그리고 균열대의 축류식 통상버너(3)에 의해 연소된 고온의 연소가스는 가열로(1)내의 소재(2)를 가열한 후 장입측의 연도(6)를 따라 배기된다.Figure 2 is a schematic configuration diagram of the sensible heat recovery system of the furnace combustion exhaust gas according to the present invention, as shown in the regenerative burner (5) of the charging table, the preheating table, the heating table and the axial flow conventional burner (3) The hot combustion gas burnt by this is heated along the flue 6 at the charging side after heating the raw material 2 in the heating furnace 1.

이때 연도(6)에 설치된 R-type 열전대(9)에 의해 측정된 배가스 온도가 기준 설정치(850℃) 보다 높을 경우에는 DCS(12)에 의해 댐퍼(22)의 개도를 조절하여 배가스 토출구(21)를 통하여 소재 예열기(23)로 공급되며, 그 후 연소배가스는 상기 소재 예열기(23) 내에 장입 대기중인 소재(2)들을 예열한 후, 배가스 순환라인(24)을 거쳐 흡입팬(25)에 의하여 저온의 상태로 배출구(26)를 통하여 배출된다.At this time, when the exhaust gas temperature measured by the R-type thermocouple (9) installed in the flue (6) is higher than the reference set value (850 ℃) by adjusting the opening degree of the damper 22 by the DCS (12) by the exhaust gas discharge port 21 Is supplied to the material preheater (23), and the combustion exhaust gas is then preheated to the material waiting to be charged in the material preheater (23), and then through the exhaust gas circulation line 24 to the suction fan (25). By the discharged through the outlet 26 in a low temperature state.

만약 상기 열전대(9)에 의하여 측정된 배가스 온도가 기준 설정치 보다 낮은 경우 종래의 시스템과 같이 작동하게 된다.If the flue-gas temperature measured by the thermocouple 9 is lower than the reference set point, it operates like a conventional system.

상기 소재 예열기(23)는 단열재질을 사용하여 열효율을 극대화할 수 있으며, 소재 예열기(23) 내부의 대기 소재(2)의 배열은 적층 또는 단층 배열로도 가능하다.The material preheater 23 may maximize thermal efficiency by using an insulating material, and the arrangement of the atmospheric material 2 inside the material preheater 23 may be a stack or a single layer arrangement.

한편, 상기 소재 예열기(23) 내부의 대기 소재(2)의 수는 가열로(1)의 연소부하율에 따라 조절하는 것이 바람직하다. 즉, 연소부하율에 따라 순환되는 연소배가스량 및 온도는 달라지게 되나, 소재 예열기(23) 내부의 대기 소재(2)의 수를 조 정하게 되면 어느 정도 일정한 온도(300~400℃)로 장입전에 예열시킬 수가 있다.On the other hand, the number of the atmospheric material (2) in the material preheater 23 is preferably adjusted according to the combustion load rate of the heating furnace (1). That is, the amount and temperature of the combustion flue gas circulated according to the combustion load rate will be different, but if the number of atmospheric materials 2 inside the material preheater 23 is adjusted, it will be preheated to a certain temperature (300 to 400 ° C.) before charging. There is a number.

도 3은 본 발명의 현열 회수 시스템의 예열효과를 나타내는 그래프로서, 대기 소재(2)의 크기는 230mm(두께)×1570mm(폭)×10,000mm(길이)이며, 초기온도가 상온인 20℃에서 연소배가스가 420℃의 온도로 10m/s로 공급될 경우의 시간에 따른 대기 소재의 온도변화를 한 매 와 두매 적층시를 비교하여 나타낸 그래프이다.Figure 3 is a graph showing the preheating effect of the sensible heat recovery system of the present invention, the size of the atmospheric material (2) is 230mm (thickness) × 1570mm (width) × 10,000mm (length), the initial temperature is 20 ℃ at room temperature This is a graph showing the temperature change of atmospheric materials with time when stacking flue gas at 10m / s at the temperature of 420 ° C.

위 그래프에 의하면 연소부하율에 따른 소재의 예열 상태를 미리 데이터베이스화하여, 가열로의 연소부하율에 따라 대기 소재의 적층 수를 조절함으로써 일정한 예열 온도를 유지할 수 있음을 알 수 있다.According to the above graph, the preheating state of the material according to the combustion load rate can be databased in advance, and it can be seen that a constant preheating temperature can be maintained by controlling the number of stacks of atmospheric materials according to the combustion load rate of the furnace.

상술한 바와 같이, 본 발명의 상세한 설명에서는 구체적인 실시 형태에 관해 설명하였으나, 이는 단지 예시적인 것이며 본 발명의 기술적 사상의 범주에서 벗어나지 않는 한도 내에서 여러 가지 변형이 가능함은 물론이다.As described above, the detailed description of the present invention has been described with respect to specific embodiments, which are merely exemplary and various modifications are possible without departing from the scope of the technical idea of the present invention.

이상에서 상세히 설명한 바와 같이, 본 발명의 가열로 연소배가스의 현열 회수 시스템을 사용하면, 기준 설정치 온도에 따라 배가스 토출구를 통하여 연소배가스를 선택적으로 배출하므로 희석팬의 가동율을 낮춤으로써 그에 따른 비용을 절감할 수 있으며, 연소배가스 현열을 장입전 대기 소재의 예열함으로써 현열 회수 효율을 극대화할 수 있다. 또한 일정온도로 가열로에 장입시킴으로서 기존의 혼재장입시 복잡한 조업패턴을 단순화시킬 수 있어 장입대 및 예열대의 안정적 조업을 가능하게 하는 효과가 있게 된다.As described in detail above, when the sensible heat recovery system of the combustion flue gas of the present invention is used, combustion flue gas is selectively discharged through the exhaust gas outlet according to the reference set point temperature, thereby reducing the operation rate of the dilution fan, thereby reducing the cost. It is possible to maximize the sensible heat recovery efficiency by preheating the atmospheric material before charging the flue gas sensible heat. In addition, by charging the heating furnace at a constant temperature it is possible to simplify the complicated operation pattern when the existing mixed loading, it is effective to enable stable operation of the charging and preheating stage.

Claims (2)

소재를 가열하기 위하여 장입대, 예열대, 가열대 및 균열대를 거치면서 발생된 가열로 내 고온의 연소배가스의 현열을 회수하기 위하여 열교환기를 사용하는 시스템에 있어서,In a system using a heat exchanger to recover the sensible heat of the high temperature combustion flue gas in the furnace generated through the charging, preheating, heating and cracking zone to heat the material, 상기 열교환기를 통과하기 전의 고온의 연소배가스를 배출시키는 배가스 토출구;An exhaust gas discharge port for discharging high-temperature combustion exhaust gas before passing through the heat exchanger; 상기 연소배가스의 온도와 기준 설정치의 온도를 비교하여 배가스 토출구 댐퍼의 개도를 조절하는 분산제어시스템;A distributed control system for adjusting the opening degree of the exhaust gas discharge port damper by comparing the temperature of the combustion exhaust gas with a temperature of a reference set value; 상기 배가스 토출구로부터 유입되는 연소배가스에 의하여 내부에 적치된 장입 대기중인 소재를 예열하는 소재 예열기;A material preheater for preheating the material waiting to be charged therein by the combustion exhaust gas flowing from the exhaust gas discharge port; 및 상기 소재 예열기와 배가스 순환라인으로 연결되어 저온의 연소배가스를 배출시키는 흡입팬을 포함하여 구성됨을 특징으로 하는 가열로 연소배가스의 현열 회수 시스템.And a suction fan connected to the material preheater and an exhaust gas circulation line for discharging low-temperature combustion exhaust gas. 제1항에 있어서,The method of claim 1, 상기 소재 예열기에 장입되는 대기 소재의 수는 가열로의 연소부하율에 따라 조절하는 것을 특징으로 하는 가열로 연소배가스의 현열 회수 시스템.The number of atmospheric materials charged into the material preheater is adjusted according to the combustion load rate of the furnace, sensible heat recovery system of the furnace combustion exhaust gas.
KR1020040069816A 2004-09-02 2004-09-02 Combustion waste gas heat recovery system in reheating furnace KR101108617B1 (en)

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