KR20020051105A - Preventing method of dust corrosion in water preheater for in coke dryer quenching system - Google Patents
Preventing method of dust corrosion in water preheater for in coke dryer quenching system Download PDFInfo
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- KR20020051105A KR20020051105A KR1020000080586A KR20000080586A KR20020051105A KR 20020051105 A KR20020051105 A KR 20020051105A KR 1020000080586 A KR1020000080586 A KR 1020000080586A KR 20000080586 A KR20000080586 A KR 20000080586A KR 20020051105 A KR20020051105 A KR 20020051105A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B39/00—Cooling or quenching coke
- C10B39/02—Dry cooling outside the oven
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Abstract
본 발명은 건식 소화 설비의 초기 가동시나 장시간 정지 후 재가동시 순환가스의 온도가 낮아 급수예열기로 유입되는 순수의 온도가 낮음으로써 발생되는 결로현상을 제거하는 건식 소화 설비 내의 급수예열기의 결로 방지방법에 관한 것으로, 건식 소화 설비 본체(1)에서 발생된 고온 순환가스가 보일러(2)로 유입된 후, 보일러(2)에서 유출되는 저온 순환가스가 된 다음, 이 저온 순환가스가 다시 건식 소화 설비 본체(1)로 유입되기 전 급수예열기(3)에서 순수를 예열하는 한편, 순수탱크(7)에서 유출되는 순수는 급수열교환기(4)에서 가열된 후, 상기 급수예열기(3)에서 예열된 다음, 탈기기(5)에서 유출되는 저압증기에 의하여 가열된 후, 상기 보일러(2)에 유입되어 상기 고온 순환가스와 열교환하여 증기가 발생하는 건식 소화 설비에 있어서, 상기 건식 소화 설비의 가동 초기에는 탈기기(5)에서 유출되는 급수의 일부를 급수예열기(3)로 공급한 다음, 일정 시간 경과 후 순환가스의 온도가 상승하면 상기 순수탱크(7)로부터 순수를 급수예열기(3)로 공급하는 것을 특징으로 하여, 건식 소화 설비 내의 급수예열기에서 발생하는 결로현상을 방지할 수 있는 효과가 있다.The present invention provides a method for preventing condensation of a water supply preheater in a dry fire extinguishing system for removing condensation caused by a low temperature of pure water flowing into the water supply preheater due to a low temperature of the circulating gas during initial operation of the dry fire extinguishing system or after restarting for a long time. In this regard, after the high temperature circulating gas generated in the dry fire extinguishing system main body 1 flows into the boiler 2 and becomes the low temperature circulating gas flowing out of the boiler 2, the low temperature circulating gas is again supplied to the dry fire extinguishing system main body. While the pure water is preheated in the feedwater preheater (3) before flowing into (1), the pure water flowing out of the pure water tank (7) is heated in the feedwater heat exchanger (4) and then preheated in the feedwater preheater (3). In the dry fire extinguishing facility which is heated by the low pressure steam flowing out of the degasser 5, flows into the boiler 2 and heat exchanges with the high temperature circulating gas to generate steam. In the initial stage of operation of the combustion plant, a part of the water discharged from the degasser 5 is supplied to the water supply preheater 3, and when the temperature of the circulating gas rises after a predetermined time, pure water is supplied from the pure water tank 7 to the water supply preheater. It is characterized in that the supply to (3), it is possible to prevent the condensation phenomenon occurring in the water supply preheater in the dry fire extinguishing equipment.
Description
본 발명은 코크스 오븐에서 제조된 고온의 코크스를 질소(N2)와 열교환시킨후 열교환된 고온의 질소(N2)를 다시 보일러에서 물과 열교환시켜 증기를 발생시키는 건식 소화 설비(Coke dryer quenching, 이하 CDQ라 함)의 초기 가동시나 장시간 정지 후 재가동시 순환가스의 온도가 낮아 급수예열기로 유입되는 순수의 온도가 낮음으로써 발생되는 결로현상을 제거하는 건식 소화 설비 내의 급수예열기의 결로 방지방법에 관한 것이다.The present invention is a dry fire extinguishing facility (Coke dryer quenching, which generates a steam by heat-exchanging the high-temperature coke produced in the coke oven with nitrogen (N 2 ) and then heat-exchanged high-temperature nitrogen (N 2 ) with water in the boiler again) The method for preventing condensation of the water supply preheater in the dry fire extinguishing system to remove condensation caused by the low temperature of the pure water flowing into the feedwater preheater due to the low temperature of the circulating gas during the initial operation of the CDQ or after restarting for a long time. will be.
일반적으로 CDQ 설비는 구체적으로 도 1의 CDQ 공정을 나타내는 개략도에 도시된 바와 같이, 코크스 오븐에서 압출된 고온(약 1000℃)의 적열코크스를 CDQ 본체(1)에 넣고, CDQ 본체(1) 하부에서 질소 순환가스를 흘려주면 코크스는 냉각되고, 순환가스는 코크스에서 얻은 열량 때문에 고온 순환가스(약 950℃)가 된다.In general, the CDQ installation includes a high temperature (approximately 1000 ° C.) red hot coke extruded from a coke oven into the CDQ main body 1, as shown in the schematic diagram showing the CDQ process of FIG. 1, and below the CDQ main body 1. Flowing nitrogen circulating gas at, the coke is cooled, the circulating gas is a high temperature circulating gas (about 950 ℃) because of the heat obtained from the coke.
이 고온의 순환가스는 보일러(2)로 보내져 증기를 발생시키는데 사용되고 약 170℃의 저온 순환가스가 된다.This high temperature circulating gas is sent to the boiler 2 to generate steam, and becomes a low temperature circulating gas of about 170 ° C.
이 저온 순환가스는 CDQ 본체(1)로 다시 보내지는데, 그 전에 급수예열기(3)에서 보일러(2)로 보내지는 물(순수)을 예열한 후 약 120℃ 상태로 CDQ 본체(1)로 보내진다.This low temperature circulating gas is sent back to the CDQ main body 1, which is then preheated to the CDQ main body 1 at a temperature of about 120 DEG C after preheating the water (pure water) sent from the water supply preheater (3) to the boiler (2). Lose.
한편, 증기생산용 물인 상온의 순수는 급수열교환기(4)에서 1차 예열(60℃)된 후 급수예열기(3)에서 2차 예열(90℃)되고, 탈기기(5)에서 저압증기에 의해 3차 예열(110℃)된 후 보일러(2)에 보내져 고온의 순환가스와 열교환되어 증기가 된다.On the other hand, the pure water at room temperature, which is water for steam production, is first preheated (60 ° C.) in the water supply heat exchanger (4), and then secondly preheated (90 ° C.) in the water supply preheater (3), and low pressure steam is removed in the deaerator (5). After the third preheating (110 ℃) is sent to the boiler (2) is exchanged with the hot circulating gas to become a steam.
특히 이 CDQ 설비 중 급수예열기(3)는 CDQ 본체(1)로 들어가는 순환가스의 온도를 낮추어줌으로서 CDQ 본체(1)에서 고온 코크스와의 열교환 효율을 향상시키고, 보일러(2)로 들어가는 순수의 온도를 높여줌으로서 보일러(2) 효율을 증가시키는 매우 중요한 역할을 하는 설비이다.In particular, the feedwater preheater (3) of the CDQ facility lowers the temperature of the circulating gas entering the CDQ main body (1) to improve the heat exchange efficiency with the high temperature coke in the CDQ main body (1), It is a facility that plays a very important role to increase the efficiency of the boiler (2) by increasing the temperature.
순수를 직접 급수예열기(3)로 통과시키지 않고 급수열교환기(4)를 거쳐서 통과시키는 이유는 순수가 상온에서 급수예열기(3)를 통과하면 급수예열기(3)의 튜브(Tube)에 더스트(Dust)가 부착(결로현상)되어 막힘이나 부식과 같은 여러가지 문제점을 발생시키기 때문이며, 급수열교환기(4)에서 급수예열기(3)를 통과한 순수(또는 급수)와 급수예열기(3)로 향하는 순수를 열교환시켜 급수예열기(3)로 향하는 순수의 온도를 약 60℃ 이상 유지시킴으로서 결로현상을 방지할 수 있다.The reason for passing the pure water through the water supply heat exchanger (4) without directly passing it through the water supply preheater (3) is that when the pure water passes through the water supply preheater (3) at room temperature, the dust in the tube of the water supply preheater (3) ) Is attached (condensation) to cause various problems such as clogging or corrosion, and the pure water (or feed water) passing through the feedwater preheater (3) from the feedwater heat exchanger (4) and the pure water directed to the feedwater preheater (3). Condensation can be prevented by maintaining the temperature of the pure water directed to the water supply preheater 3 by heat exchange.
그러나 이 조건은 급수예열기(3)에서 나오는 순수의 온도가 90℃ 이상이 되어야 상온의 순수를 60℃ 이상으로 예열할 수 있다.However, in this condition, the pure water at room temperature can be preheated to 60 ° C or higher only when the temperature of the pure water from the feedwater preheater 3 is 90 ° C or higher.
정상적인 상태에서는 이러한 조건이 충분히 만족되지만 처음 CDQ를 가동하거나, 장시간 정지 후 재가동시에는 초기에 순환가스의 온도가 낮아 급수예열기(3)로 들어오는 순수의 온도를 충분히 높일 수 없게 된다.Under normal conditions, this condition is sufficiently satisfied, but when the CDQ is operated for the first time or restarted after a long time stop, the temperature of the circulating gas is initially low, and thus the temperature of pure water entering the feedwater preheater 3 cannot be sufficiently increased.
그러면 급수예열기(3)를 나오는 순수의 온도가 낮아 급수열교환기(4)에서 열교환도 불충분하여 급수예열기(3)로 향하는 순수의 온도를 충분히 예열할 수 없어 결로현상이 불가피하게 된다.Then, the temperature of the pure water exiting the feedwater preheater 3 is low, so that the heat exchange in the feedwater heat exchanger 4 is insufficient, and thus the condensation phenomenon is inevitable because the temperature of the pure water directed to the feedwater preheater 3 cannot be sufficiently preheated.
종래에는 도 2의 종래의 급수예열기에서의 순수의 공급 계통을 나타내는 구성도에 도시된 바와 같이 제 2 밸브(9)는 잠긴 상태에서 처음에 순수는 순수탱크(7)에서 나와서 급수열교환기(4)를 거쳐 급수예열기(3)로 들어가지만 급수예열기(3)를 통과하는 순환가스의 온도가 낮아 충분히 열교환이 이루어지지 않으므로 급수예열기(3)를 나오는 순수의 온도도 낮게 된다.Conventionally, as shown in the block diagram showing the supply system of the pure water in the conventional water supply preheater of FIG. 2, the pure water first comes out of the pure water tank 7 while the second valve 9 is locked and the water supply heat exchanger 4 However, the temperature of the circulating gas passing through the feedwater preheater (3) is low because the temperature of the circulating gas passing through the feedwater preheater (3) is not sufficient, so that the temperature of the pure water exiting the feedwater preheater (3) is also low.
따라서 급수열교환기(4)에서 상온의 순수를 예열하기는 어렵다. 단지 어느 정도 시간이 흘러 순환가스의 온도가 정상적인 170℃ 이상이 되면 급수예열기(3)에 들어오는 순수에 충분한 열교환을 하므로 급수열교환기(4)에서도 충분히 열교환이 이루어지게 된다.Therefore, it is difficult to preheat the pure water at room temperature in the feedwater heat exchanger (4). If only a certain time passes the temperature of the circulating gas is more than 170 ℃ normal heat exchange to the pure water entering the feed water preheater (3) is sufficient heat exchange in the feed water heat exchanger (4).
그러나 이와 같은 종래의 방법에 의하면 CDQ 초기 가동 또는 정지 후 재가동시에 급수예열기(3)의 결로현상을 방지할 수 없으므로 건식 소화 설비 자체의 열효율의 저하되고, 관 막힘 등에 의한 관 손상이 발생되어 자주 관을 교체하여야 한다는 문제점이 있었다.However, according to the conventional method, condensation of the water supply preheater 3 cannot be prevented when the CDQ is initially started or stopped and restarted. Therefore, the thermal efficiency of the dry fire extinguishing system itself is reduced, and tube damage is caused by clogging. There was a problem that must be replaced.
본 발명은 상기와 같은 종래 기술에 있어서의 문제점을 해결하기 위하여 발명된 것으로, CDQ의 초기 가동 또는 장시간 정지 후 재가동시 먼저 탈기기에서 나오는 급수의 일부를 급수예열기로 향하게 하여 CDQ 급수예열기 결로현상을 방지하는 CDQ 내부의 급수가열기의 결로 방지방법을 제공함을 그 목적으로 한다.The present invention has been invented to solve the problems in the prior art as described above, the CDQ feed water preheater dew condensation phenomenon by directing a part of the feed water from the deaerator to the feed water preheater when the CDQ is initially started or restarted after a prolonged stop. The object of the present invention is to provide a method for preventing condensation of a water heater inside the CDQ.
도 1은 CDQ 공정을 나타내는 개략도.1 is a schematic diagram illustrating a CDQ process.
도 2는 종래의 급수예열기에서의 순수의 공급 계통을 나타내는 구성도.2 is a block diagram showing a system for supplying pure water in a conventional water supply preheater.
도 3은 본 발명에 의한 급수예열기에서의 순수 공급 계통을 나타내는 구성도.3 is a block diagram showing a pure water supply system in the water supply preheater according to the present invention.
< 도면의 주요부분에 대한 부호의 설명 ><Description of Symbols for Major Parts of Drawings>
1 : 건식 소화 설비 본체2 : 보일러1: dry fire extinguishing system body 2: boiler
3 : 급수예열기4 : 급수열교환기3: feed water preheater 4: feed water heat exchanger
5 : 탈기기6 : 송풍기5: deaerator 6: blower
7 : 순수탱크8 : 제 1 밸브7: pure water tank 8: first valve
9 : 제 2 밸브10 : 제 3 밸브9: 2nd valve 10: 3rd valve
상기의 목적을 달성하기 위한 본 발명의 건식 소화 설비 내의 급수예열기의 결로 방지방법은, 건식 소화 설비 본체(1)에서 발생된 고온 순환가스가 보일러(2)로 유입된 후, 보일러(2)에서 유출되는 저온 순환가스가 된 다음, 이 저온 순환가스가 다시 건식 소화 설비 본체(1)로 유입되기 전 급수예열기(3)에서 순수를 예열하는 한편, 순수탱크(7)에서 유출되는 순수는 급수열교환기(4)에서 가열된 후, 상기 급수예열기(3)에서 예열된 다음, 탈기기(5)에서 유출되는 저압증기에 의하여 가열된 후, 상기 보일러(2)에 유입되어 상기 고온 순환가스와 열교환하여 증기가 발생하는 건식 소화 설비에 있어서,Condensation prevention method of the water supply preheater in the dry fire extinguishing equipment of the present invention for achieving the above object, after the hot circulating gas generated from the dry fire extinguishing equipment main body 1 is introduced into the boiler (2), in the boiler (2) After the low temperature circulating gas is discharged, the low temperature circulating gas is preheated in the water supply preheater (3) before the low temperature circulating gas is flowed back into the dry fire extinguishing system main body (1), while the pure water flowing out of the pure water tank (7) is feed water heat exchange. After heating in the gas (4), it is preheated in the water supply preheater (3), then heated by low pressure steam flowing out of the degasser 5, and then flows into the boiler (2) to exchange heat with the hot circulating gas In a dry fire extinguishing system that generates steam by
상기 건식 소화 설비의 가동 초기에는 탈기기(5)에서 유출되는 급수의 일부를 급수예열기(3)로 공급한 다음, 일정 시간 경과 후 순환가스의 온도가 상승하면 상기 순수탱크(7)로부터 순수를 급수예열기(3)로 공급하는 것을 특징으로 한다.In the initial stage of operation of the dry fire extinguishing equipment, a part of the water supply flowing out of the degasser 5 is supplied to the water supply preheater 3, and when the temperature of the circulating gas rises after a predetermined time, pure water is removed from the pure water tank 7. It is characterized in that the feed to the water supply preheater (3).
이하에서는 첨부도면을 참조하여 본 발명에 대하여 상세히 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the present invention.
도 3은 본 발명에 의한 급수예열기에서의 순수 공급 계통을 나타내는 구성도로서, 도면 중에서 1은 CDQ 본체, 2는 보일러, 3은 급수예열기, 4는 급수열교환기, 5는 탈기기, 7은 순수탱크, 8은 제 1 밸브, 9는 제 2 밸브, 10은 제 3 밸브이다.3 is a configuration diagram showing a pure water supply system in the feedwater preheater according to the present invention, in which 1 is a CDQ main body, 2 is a boiler, 3 is a feedwater preheater, 4 is a feedwater heat exchanger, 5 is a deaerator, and 7 is pure water. The tank, 8 is a first valve, 9 is a second valve, and 10 is a third valve.
도 2의 종래의 구성도와 비교하면, 탈기기(5)에서 나오는 급수라인을 급수예열기(3)로 들어가는 라인과 연결하였다는 점이다.Compared with the conventional configuration diagram of FIG. 2, the water supply line coming out of the deaerator 5 is connected to the line entering the water supply preheater 3.
이하에서는 상기와 같이 구성된 본 발명의 작용에 대하여 상세히 설명한다.Hereinafter will be described in detail the operation of the present invention configured as described above.
도 3을 참조하여 종래 기술인 도 2와 비교하면, 건식 소화 설비의 가동 초기에는 제 1 밸브(8) 및 제 2 밸브(9)를 열고 제 3 밸브(10)를 닫아 상온의 순수가 급수예열기(3)로 직접 들어가는 것을 막고 탈기기(5)로 흐르도록 하는 것이다.Compared with FIG. 2 of the prior art with reference to FIG. 3, in the initial stage of operation of the dry fire extinguishing facility, the first valve 8 and the second valve 9 are opened, and the third valve 10 is closed to obtain pure water at room temperature. 3) to prevent direct entry into the deaerator (5) to flow.
그 다음에 탈기기(5)에 공급되는 저압증기의 양을 증가시켜 탈기기(5)로 들어오는 순수의 온도를 높여주게 된다.Then, the amount of low pressure steam supplied to the degasser 5 is increased to increase the temperature of pure water entering the degasser 5.
다음 탈기기(5)를 나가는 급수의 일부를 급수예열기(3)로 보내게 되면 이 급수의 온도는 60℃ 이상이 되어 급수예열기(3)의 결로현상을 방지할 수 있게 된다.Next, when a part of the feed water leaving the degassing apparatus 5 is sent to the feed water preheater 3, the temperature of the feed water becomes 60 ° C. or more to prevent condensation of the feed water preheater 3.
어느 정도 시간이 흘러 순환가스의 온도가 정상적이 되면 제 1 밸브(8) 및제 2 밸브(9)는 잠그고 제 3 밸브(10)를 열어 순수가 급수예열기(3)에 들어가도 순환가스의 온도가 충분히 높은 상태가 되므로 바로 급수열교환기(4)에서 상온의 순수를 예열하여 순수의 온도를 충분히 높일 수 있다.After some time, when the temperature of the circulating gas is normal, the first valve 8 and the second valve 9 are closed and the third valve 10 is opened, so that the temperature of the circulating gas is sufficient even if the pure water enters the water supply preheater 3. Since it is in a high state, the pure water at room temperature may be preheated immediately in the water supply heat exchanger 4 to sufficiently increase the temperature of the pure water.
이상에서 상세히 설명한 바와 같이, 본 발명의 건식 소화 설비 내의 급수예열기의 결로 방지방법을 사용하면, CDQ 초기 가동 또는 장시간 정지 후 재가동시 탈기기(5)에서 나오는 급수를 급수예열기로 향하게 함으로써 CDQ 내의 급수예열기 결로현상을 방지할 수 있는 효과가 있게 된다.As described in detail above, using the condensation prevention method of the water heater preheater in the dry fire extinguishing system of the present invention, the water supply in the CDQ by directing the water supply from the deaerator (5) to the water preheater during the initial operation of CDQ or restarting after prolonged shutdown It is effective to prevent preheater condensation.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020000080586A KR20020051105A (en) | 2000-12-22 | 2000-12-22 | Preventing method of dust corrosion in water preheater for in coke dryer quenching system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020000080586A KR20020051105A (en) | 2000-12-22 | 2000-12-22 | Preventing method of dust corrosion in water preheater for in coke dryer quenching system |
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| KR20020051105A true KR20020051105A (en) | 2002-06-28 |
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| KR1020000080586A Withdrawn KR20020051105A (en) | 2000-12-22 | 2000-12-22 | Preventing method of dust corrosion in water preheater for in coke dryer quenching system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100742826B1 (en) * | 2001-07-10 | 2007-07-25 | 주식회사 포스코 | Water supply preheating system with condensation prevention and dust removal of heat pipe |
| KR100966123B1 (en) * | 2008-05-28 | 2010-06-25 | 주식회사 엘지화학 | How to optimize naphtha cracking plant WPF system |
| US20140007823A1 (en) * | 2011-03-16 | 2014-01-09 | Shanghai Fubo Ep Equipment Co., Ltd. | Heating system for heating heat-transfer oil usingboiler flue gas |
| KR20160061377A (en) | 2013-09-26 | 2016-05-31 | 가부시키가이샤 한도오따이 에네루기 켄큐쇼 | Switch circuit, semiconductor device, and system |
-
2000
- 2000-12-22 KR KR1020000080586A patent/KR20020051105A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100742826B1 (en) * | 2001-07-10 | 2007-07-25 | 주식회사 포스코 | Water supply preheating system with condensation prevention and dust removal of heat pipe |
| KR100966123B1 (en) * | 2008-05-28 | 2010-06-25 | 주식회사 엘지화학 | How to optimize naphtha cracking plant WPF system |
| US20140007823A1 (en) * | 2011-03-16 | 2014-01-09 | Shanghai Fubo Ep Equipment Co., Ltd. | Heating system for heating heat-transfer oil usingboiler flue gas |
| KR20160061377A (en) | 2013-09-26 | 2016-05-31 | 가부시키가이샤 한도오따이 에네루기 켄큐쇼 | Switch circuit, semiconductor device, and system |
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