KR100332695B1 - Apparatus for Neutralizing of Condensate for Anti-corrosion of Heat Exchanger Surface and Method Theirof - Google Patents
Apparatus for Neutralizing of Condensate for Anti-corrosion of Heat Exchanger Surface and Method Theirof Download PDFInfo
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- KR100332695B1 KR100332695B1 KR1019990058042A KR19990058042A KR100332695B1 KR 100332695 B1 KR100332695 B1 KR 100332695B1 KR 1019990058042 A KR1019990058042 A KR 1019990058042A KR 19990058042 A KR19990058042 A KR 19990058042A KR 100332695 B1 KR100332695 B1 KR 100332695B1
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- Prior art keywords
- water
- heat exchanger
- condensate
- condensation type
- boiler
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- 238000005260 corrosion Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 6
- 230000003472 neutralizing effect Effects 0.000 title claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 238000009833 condensation Methods 0.000 claims abstract description 24
- 230000005494 condensation Effects 0.000 claims abstract description 24
- 230000007797 corrosion Effects 0.000 claims abstract description 14
- 230000002378 acidificating effect Effects 0.000 claims abstract description 6
- 239000007921 spray Substances 0.000 claims abstract description 3
- 238000006386 neutralization reaction Methods 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims 2
- 238000005536 corrosion prevention Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 230000007935 neutral effect Effects 0.000 abstract description 3
- 238000002347 injection Methods 0.000 abstract description 2
- 239000007924 injection Substances 0.000 abstract description 2
- 230000010412 perfusion Effects 0.000 abstract description 2
- 230000002265 prevention Effects 0.000 abstract description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 239000000567 combustion gas Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 239000003621 irrigation water Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/04—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by preventing the formation of continuous films of condensate on heat-exchange surfaces, e.g. by promoting droplet formation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
Abstract
본 발명은 응축형 열교환기의 전열면 부식방지 장치 및 방법에 관한 것이다. 보다 상세하게는 절탄기나 공기예열기로서 작용하는 응축형 열교환기를 갖는 소형관류식, 노통연관식 또는 수관식 증기보일러의 응축형 열교환기의 배기가스측 전열면이 산성도가 높은 응축수에 노출되어 부식이 발생하는 것을 방지하기 위하여 적당한 양의 알칼리도가 높은 보일러 관수 또는 블로우다운수를 살수기의 분사노즐이나 분사공을 통해서 응축형 열교환기의 상부에서 전열면의 전 면적에 고루 살포시켜서 전열면을 세척함으로써 산에 의한 부식이 발생하지 않도록 하는 데 있다. 또한 발생되는 산성의 응축수를 중성 또는 약알칼리성으로 변화시켜 배출함으로써 환경오염방지에 기여할 수 있도록 하는데 그 목적이 있다The present invention relates to an apparatus and method for preventing corrosion of heat transfer surfaces of a condensation type heat exchanger. More specifically, the exhaust gas side heat transfer surface of a small perfusion type, furnace tube type or water pipe steam boiler having a condensation type heat exchanger acting as an economizer or an air preheater is exposed to condensate with high acidity, causing corrosion. In order to prevent the water from being heated, a suitable amount of high alkalinity boiler water or blowdown water is sprayed on the entire surface of the heat transfer surface at the top of the condensation type heat exchanger through the spray nozzle or the injection hole of the sprayer to wash the heat transfer surface. It is to prevent the corrosion caused by. In addition, the purpose is to contribute to the prevention of environmental pollution by changing the acidic condensate generated to neutral or weak alkaline.
Description
본 발명은 응축형 열교환기의 전열면 부식방지 장치 및 방법에 관한 것이다. 종래에 소형관류 보일러, 노통연관식 보일러, 수관보일러 등 증기를 생산하는 보일러에서 응축형 열교환기를 사용하는 경우 응축수에 의한 전열면 부식과 응축수의 산성화에 의한 환경파괴가 크게 문제되고 있는 실정이다. 그러나 이에 대한 마땅한 대책이 마련되지 못하므로 인하여 지금까지 개발된 응축형 보일러는 에너지 절약효과가 높고 친환경적인 특성이 있음에도 불구하고 응축형 열교환기의 내식성을 향상시키는데 따른 기기설치 비용 및 응축수의 처리비용이 증대되므로 인하여 응축형 보일러의 보급이 지연되어 왔다.The present invention relates to an apparatus and method for preventing corrosion of heat transfer surfaces of a condensation type heat exchanger. Conventionally, when a condensation type heat exchanger is used in a boiler that produces steam, such as a small perfusion boiler, a furnace tube type boiler, a water pipe boiler, environmental damage due to corrosion of the heat transfer surface by condensate and acidification of the condensate is a problem. However, due to the lack of proper countermeasures, condensing boilers developed so far have high energy savings and are environmentally friendly. Due to the increase, the spread of condensing boilers has been delayed.
본 발명은 응축형열교환기에 있어서 응축수는 연소가스중의 질소산화물 등이 녹아 산성을 나타내는 반면 증기를 생산하는 보일러관수와 블로우다운수는 알칼리도가 높으므로 이 양자를 적절히 섞어 활용하면 적어도 산성의 응축수를 중성에 가까운 상태로 유지할 수 있다는 데 착안하여 본 발명을 완성하게 되었다. 본 발명의 방법과 이를 달성하기 위한 장치는 아직까지 적용되거나 보고된 예가 없다.In the present invention, the condensate in the condensation type heat exchanger is acidic by melting nitrogen oxides in the combustion gas, while the boiler water and the blowdown water producing steam have a high alkalinity, so that if both of them are properly mixed, at least acidic condensate is used. The present invention has been completed by focusing on being able to maintain a state near neutral. The method of the present invention and the apparatus for achieving this have not yet been applied or reported.
본 발명은 응축형열교환기 전열면의 부식방지를 위하여 알칼리도가 높은 보일러 관수 또는 블로우다운수를 전열면에 살포하는 장치 및 방법을 제공하는 것을목적으로 한다.The present invention aims to provide an apparatus and method for spraying high alkalinity boiler water or blowdown water onto a heat transfer surface to prevent corrosion of the heat transfer surface of the condensation type heat exchanger.
도 1은 본 발명의 바람직한 실시 예에 따른 보일러 및 부속장치의 종단면도이다.1 is a longitudinal sectional view of a boiler and an accessory according to a preferred embodiment of the present invention.
<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>
1: 버너 2: 화실 3: 1차연관1: burner 2: firebox 3: primary connection
4: 2차연관 5: 보일러관수 6: 블로우다운관4: secondary tube 5: boiler tube 6: blowdown tube
7: 증기 8: 연도 9: 블로우다운용 전동7: steam 8: flue 9: blowdown electric
10: 블로우다운수 열교환기 11: pH조절용 전동밸브 12: 유량제한밸브10: blowdown water heat exchanger 11: pH regulating electric valve 12: flow restriction valve
13: pH메터 14: 살수기 15: 응축형열교환기13: pH meter 14: Spraying machine 15: Condensation type heat exchanger
16: 굴뚝 17: 공기침입방지기 18: 필터16: Chimney 17: Air intrusion protector 18: Filter
본 발명의 전열면 부식방지용 응축수 중화장치는 보일러관수 또는 블로우다운수와 응축수가 혼합될 때 원할하게 pH값을 조절하는 것이 가장 중요한 요소로서 다음과 같이 구체적으로 설명하고자 한다.Condensate neutralization device for preventing corrosion of the heat transfer surface of the present invention will be described in detail as follows as the most important factor to smoothly adjust the pH value when the boiler water or blowdown water and condensate is mixed.
일반적으로 보일러의 관수는 물속에 포함되어 있는 경도 성분은 물이 증발함에 따라서 농축되어서 고형 물질을 형성하며, 보일러 관수의 상부 또는 하부에 모이게 된다. 이들은 보일러 장해의 주요원인이 되기 때문에 주기적으로 전동밸브(9)를 열어서 블로다운 관(6)을 통해서 블로우다운관수 열교환기(10)를 거쳐서 보일러 외부로 배출시켜야 한다. 또한 보일러 관수는 보일러 재료인 강의 부식에 가장 안정적인 pH 11∼12의 알카리성이 되게 수질을 관리해야 하는 것이 원칙이다.In general, the watering of the boiler is a hardness component contained in the water is concentrated as the water evaporates to form a solid material, it is collected in the upper or lower portion of the boiler water. Since these are the main causes of boiler failure, the electric valve 9 should be opened periodically and discharged to the outside of the boiler through the blowdown tube water heat exchanger 10 through the blowdown tube 6. In addition, boiler irrigation should be controlled to be alkaline at pH 11-12, which is the most stable against corrosion of steel, boiler material.
우선 상기의 목적을 달성하기 위하여 도 1에서와 같이 보일러에 기본적으로 구비되어 있는 것으로서 앞서 설명한 블로우다운 관로상에 추가하여 본 발명에서는 유량제한용밸브(12)를 설치하고, 이 제한용 밸브 전방에 T관을 설치하여 블로우다운수의 일부가 pH 조절용 전동밸브(11)를 거쳐서 필터(18)를 통해서 살수기(14)에 공급되게 구성한다. 통상 블로우다운용 전동밸브(9)는 수동인 것도 있으나 연속적으로 블로우다운을 하는 것도 있기 때문에 어떤 경우에도 제한용 밸브(12)를 이용하여 블로우다운수에 보일러 내부의 압력이 전달되어서 살수기(14) 쪽으로 유동되어 갈 수 있게 한다. 이때 pH 조절용전동밸브(11)의 개도 또는 열림 시간에 따라서살수 유량이 제어된다. 고압고온의 보일러관수는 열량이 높기 때문에 블로우다운수 열교환기(10)을 거쳐서 온도가 낮게 함으로서 응축형 열교환기(15)에서 분사될 때 갑자기 압력강하됨에 따른 증기화가 일어나지 않도록 해야한다. 블로우다운수가 증기화되면 배기가스에 동반되어서 굴뚝을 통해서 곧장 배출되는 경향이 있어서 효과적으로 연소가스 응축수를 중화시키기가 어렵기 때문이다. 이렇게 온도가 낮아진 채로 이송된 보일러관수 또는 블로우다운수가 응축형열교환기(15)의 전체 전열면에 골고루 알칼리도가 높은 보일러 관수 또는 블로우다운수를 분사노즐이나 파이프에 각 방향으로 고루 분산될 수 있게 제작된 분사공이 구비된 살수기를 통해서 응축형 열교환기의 상부에서 전열면의 전 면적에 고루 살포하게 되면 응축형열교환기(15)의 표면인 전열면에 부착된 산도가 높은 응축수를 잘 씻어 내게 함으로서 산성수에 의한 국부 부식이 발생하지 않도록 하여야만 열교환기의 수명을 오래 유지할 수 있다.First, in order to achieve the above object, as shown in FIG. 1, the boiler is basically provided in addition to the blowdown pipe described above, and in the present invention, a flow restriction valve 12 is provided, By installing a T pipe, a part of the blowdown water is configured to be supplied to the sprayer 14 through the filter 18 via the electric valve 11 for pH adjustment. Normally, the blowdown electric valve 9 is manual, but there are also continuous blowdowns. In any case, the pressure inside the boiler is transmitted to the blowdown water using the restrictor valve 12 so that the sprayer 14 To flow to the side. At this time, the water flow rate is controlled according to the opening degree or opening time of the pH regulating motor 11. Boiler water at high pressure and high temperature has a high heat amount, so that the temperature is lowered through the blowdown water heat exchanger 10 so as to prevent vaporization due to sudden pressure drop when injected from the condensation type heat exchanger 15. This is because when the blowdown water vaporizes, it tends to be accompanied by the exhaust gas and discharged straight through the chimney, which makes it difficult to effectively neutralize the combustion gas condensate. The boiler water or blowdown water transported while the temperature is lowered is produced so that evenly alkaline boiler water or blowdown water is uniformly distributed in each direction to the spray nozzle or pipe on the entire heat transfer surface of the condensation type heat exchanger 15. When sprayed evenly over the entire area of the heat transfer surface from the top of the condensation type heat exchanger through the sprayer equipped with the injection hole, the acidity is well washed by washing the acidic condensate attached to the heat transfer surface, which is the surface of the condensation type heat exchanger 15. The long life of the heat exchanger can be maintained only if local corrosion by water does not occur.
또한 열교환기 전열면을 씻고 내려온 혼합수(응축수와 보일러관수 또는 블로우다운수)는 응축형열교환기 하단부에 모이도록 하고, 이 혼합수의 산도를 pH미터( 13)로 측정하여 중성을 유지시켜서 공기침입방지기(17)을 통해서 하수구로 자연 배출시킨다. 그러나 혼합수의 pH가 알칼리성을 나타내게 되면 제한 밸브(12)와 pH조절용 전동밸브(11)를 조절하여 블로우다운수 또는 보일러 관수가 적게 공급되도록 조절하고, 산성을 띄게되면 그 양을 증가시켜서 혼합수의 pH를 중성영역으로 중화시켜서 방출시킴으로서 보일러의 응축형 열교환기의 부식을 방지하고 산성 응축수에 의한 환경오염을 방지할 뿐만아니라 보일러 블로우다운수의 중화비용을 감소시킬 수 있다.In addition, the mixed water (condensed water and boiler water or blowdown water) washed down from the heat exchanger heat exchanger is collected at the bottom of the condensation type heat exchanger, and the acidity of the mixed water is measured by a pH meter (13) to maintain neutrality. Natural discharge to the sewer through the intrusion preventer (17). However, if the pH of the mixed water shows alkalinity, the control valve 12 and the pH regulating electric valve 11 are adjusted to control the supply of the blowdown water or the boiler irrigation water, and when the acidity becomes high, the amount of the mixed water is increased. By neutralizing and discharging the pH in the neutral zone, it is possible to prevent corrosion of the condensation type heat exchanger of the boiler and to prevent environmental pollution by acidic condensate, as well as to reduce the cost of neutralizing the boiler blowdown water.
본 발명의 응축형 열교환기의 전열면 부식방지용 응축수의 중화장치는 증기를 발생시키고 응축형 열교환기를 갖는 모든 보일러에 적용하면 응축형 열교환기의 사용주기를 크게 늘릴 수 있다. 또한 산도가 높은 응축수와 강알칼리성의 블로우다운수를 중화함으로써 별도로 폐수처리하는데 따르는 비용을 절감하고 환경오염 방지에 기여할 수 있다.The neutralization device of the condensate for preventing corrosion of the heat transfer surface of the condensation type heat exchanger of the present invention can greatly increase the use cycle of the condensation type heat exchanger if it is applied to all boilers that generate steam and have a condensation type heat exchanger. In addition, by neutralizing high acid condensate and strongly alkaline blowdown water, it can reduce the cost of separate wastewater treatment and contribute to the prevention of environmental pollution.
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| KR1019990058042A KR100332695B1 (en) | 1999-12-15 | 1999-12-15 | Apparatus for Neutralizing of Condensate for Anti-corrosion of Heat Exchanger Surface and Method Theirof |
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| KR100361315B1 (en) * | 2000-07-10 | 2002-11-18 | 주식회사 경동보일러 | Corr0sion inhibit and neutralization units of gas boiler |
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| KR100712970B1 (en) * | 2005-03-03 | 2007-05-02 | 롬 앤드 하아스 컴패니 | Method for reducing corrosion |
| KR101224770B1 (en) * | 2009-12-29 | 2013-01-22 | 배남진 | Boiler based on Water Jet Method |
| KR102284334B1 (en) * | 2020-10-26 | 2021-08-02 | (주) 휴엔 | Heat exchanger for food waste disposal |
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| JPH08219405A (en) * | 1995-02-16 | 1996-08-30 | Kyushu Electric Power Co Inc | Corrosionproof method for boiler equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100749642B1 (en) * | 2001-10-22 | 2007-08-14 | 주식회사 포스코 | Apparatus for controlling pH of the cooling water |
| KR101290393B1 (en) * | 2006-04-25 | 2013-07-26 | 엘지전자 주식회사 | Dish washer and controlling method of the same of |
| KR101285530B1 (en) | 2013-01-23 | 2013-07-17 | 한국정수공업 주식회사 | Method and system for monitoring leakage of steam generator tube of nuclear power plant using trace level of boron |
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| Publication number | Publication date |
|---|---|
| KR20010056548A (en) | 2001-07-04 |
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