CN103112913A - Method for removing dissolved oxygen in boiler water supply - Google Patents
Method for removing dissolved oxygen in boiler water supply Download PDFInfo
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- CN103112913A CN103112913A CN2012104466637A CN201210446663A CN103112913A CN 103112913 A CN103112913 A CN 103112913A CN 2012104466637 A CN2012104466637 A CN 2012104466637A CN 201210446663 A CN201210446663 A CN 201210446663A CN 103112913 A CN103112913 A CN 103112913A
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Abstract
The invention relates to a method for removing dissolved oxygen in boiler water supply. The method is characterized by comprising the steps of (a) extracting hydrogen from synthesis ammonia vent gas in the synthesis ammonia production process by utilizing a hydrogen extraction device; (b) introducing tail gas after being subjected to hydrogen extraction into the lower part of a stripping tower so that from bottom to top, the tail gas is countercurrent contact with water containing oxygen which flows from top to bottom, conveying oxygen dissolved in the water and the tail gas together to a three-waste furnace or a blowing air recovery device to recover latent heat from the dissolved oxygen and the tail gas; and (c) introducing the deoxidized water after being subjected to gas stripping into a water tank at the lower part of the stripping tower, carrying out water sampling and analyzing, discharging the deoxidized water into a deoxidizing water tank after the dissolved oxygen is less than or equal to 15 mg/l, and sending the deoxidized water to a boiler by a boiler high-pressure pump. The method has the advantages that exhaust gas resources in synthesis ammonia production are adequately utilized to carry out deoxidization on the boiler water supply, the water energy consumption in the deoxidization is substantially decreased, and the production cost is lowered; and after being actually used by an applicant, for a synthesis ammonia factory with an annual output of 150000 tons of the synthesis ammonia, about 5000 tons of standard fuels which is equivalent to five million yuan can be saved in each year.
Description
Technical field
The present invention relates to remove the method for dissolved oxygen in boiler water supply.
Background technology
Be the principal element that causes generator tube corrosion in water feeding system due to the dissolved oxygen in water, therefore feedwater must be carried out deoxygenation before entering boiler.Usually mesohigh boiler employing thermal de-aeration is main, and chemical deoxidization is auxiliary, and low pressure boiler can adopt separately thermal de-aeration.
The principle of thermal de-aeration is based on the Henry's law of gas: the solubleness of gas in water is divided into direct ratio with giving gas on vapour, water termination, and irrelevant with barometric point.When in normal atmosphere, water being heated to boiling, the water saturation vapor pressure equals the barometric point on vapour-water termination, and the dividing potential drop of oxygen is zero, and the meltage of oxygen this moment in water is zero.Thermal de-aeration is exactly around this principle, steam is passed in deoxygenator, the temperature of saturation (being also the boiling temperature of water) that water that will deoxygenation is heated under relevant pressure parses the gas that is dissolved in water, and discharges deoxygenator with residual air, to reach the purpose of deoxygenation.
Adopt thermal de-aeration in oiler feed, general requirement is heated to 103 ℃ of left and right with water supply, and this will consume a large amount of steam, has wasted the energy.After the waste heat in the water supply employing remanufacture process of nitrogen fertilizer plant, the water supply water temperature is 60 ℃ of left and right, it to be heated to 100 ℃, water supply per ton needs to provide the heat (heat of gasification and the thermosteresis that do not comprise part water) of 40000 kilocalories to amount to mark coal 5.7kg at least, need approximately 10kg mark coal the dissolved oxygen in one ton of water can be removed in actual motion, according to the synthesis ammonia plant of producing 150000 tons of total ammonia per year, year needs the water of deoxidation at 500000 tons, adopt thermodynamic deoxidizing method, only this item need consume 5000 tons, mark coal, amounts to 5,000,000 yuan of Renminbi.
Summary of the invention
Purpose of the present invention is exactly the high defective of energy energy expenditure that adopts thermal de-aeration to exist in existing oiler feed in order to solve, the method for removing dissolved oxygen in boiler water supply that provides.
The technical solution used in the present invention is as follows:
Remove the method for dissolved oxygen in boiler water supply, it is characterized in that comprising the following steps:
The synthetic ammonia emptying gas of a, production of synthetic ammonia extracts hydrogen through carrying hydrogen production device;
B, extract tail gas after hydrogen and enter the gas stripping column bottom, tail gas carries out counter current contact with from top to bottom not deaerated water from bottom to top, and oxygen in water gas discharges with tail gas and is sent in the lump three wastes stove or air blown gas recovery unit, reclaims its latent heat;
C, the deaerated water after air lift enter gas stripping column bottom water tank, and the water sampling analysis after dissolved oxygen≤15mg/l, enters the deoxidation tank, by Boiler High Pressure pumping boiler.
If analyze through step c water sampling, the dissolved oxygen 〉=15mg/l in deaerated water can pass through the gas stripping column recycle pump, with below standard deaerated water be back to again in gas stripping column with tail gas again counter current contact carry out the air lift deoxygenation, until deaerated water dissolved oxygen≤15mg/l.
The present invention removes the principle of oxygen in water gas:
It is the dividing potential drop of oxygen according to gas Henry's law: Po2=E*Na(Po2, E is the Henry'S coefficient of O2, Na is the mole fraction of O2 in water), need the water supply of deoxidation fully to contact with dropping a hint of synthesis ammonia system after carrying hydrogen, because the O2 content in dropping a hint is zero, so the dissolved oxygen in water will discharge, reach the purpose of deoxygenation.
According to " little synthesis ammonia plant Technology and design manual ", synthetic ammonia per ton produces drop a hint for 135.5NM3/TNH3(Nm3 be mark rice, TNH3 is a ton ammonia), main component: NH3:9.4%, CH4:14%, Ar:4.3%, H2:54%, N2:18.2%, emptying tolerance is at 40 NM3/TNH3, and ton ammonia need to remove the de-salted water of oxygen at 3.0 tons/TNH3, carry out sufficient counter current contact if making drops a hint with water supply, due to gas/water than more than 13, fully can with supply water dissolved oxygen remove the standard that reaches 0.015g/l.
Therefore of the present inventionly be a little: the waste gas resource that takes full advantage of Ammonia Production is carried out boiler supply water deaerating, significantly reduces the deaerated water energy consumption, has reduced production cost.
Description of drawings
Fig. 1 is gas device of the present invention and process flow sheet.
Embodiment:
Method of removing dissolved oxygen in boiler water supply provided by the invention, adopted device as shown in Figure 1, it comprises extracts hydrogen device (membrane separation unit), it is connected with gas tower bottom by pipeline, gas tower bottom is connected with water tank, is connected water circulating pump between water tank and gas tower, and water circulating pump also connects old sweet-water tank, deoxidation water tank and connected high-pressure pump thereof separately are set, and deoxidation water tank is connected with gas tower water tank by pipeline.
As shown in Figure 1, synthetic drop a hint (temperature 25, pressure 15MPa), after carrying hydrogen production device (membrane separation unit), infiltration gas H2 returns to compression and produces ammonia alcohol, tail gas (mainly comprising N2, CH4, Ar) enters the gas stripping column bottom, tail gas carries out counter current contact (exhaust flow 670m3/h, temperature 95, pressure 0.15MPa with from top to bottom not deaerated water from bottom to top, deaerated water flow 40m3/h), oxygen in water gas discharges with tail gas and is sent to three wastes stove or air blown gas recovery unit, reclaims its latent heat.Deaerated water after air lift enters gas tower bottom water tank, through the water sampling analysis, enters the deoxidation tank after dissolved oxygen≤15mg/l, by Boiler High Pressure pumping boiler.If the dissolved oxygen 〉=15mg/l in water is below standard, can below standard deaerated water be pumped into the gas tower by water pump, with the exhaust gas recirculation counter current contact once, until deaerated water dissolved oxygen≤15mg/l is qualified.
The present invention for a synthesis ammonia plant of producing 150000 ton/years per year, can save approximately 5000 tons, mark coal through the actual use of applicant year, amounts to 5,000,000 yuan of Renminbi.
Claims (2)
1. remove the method for dissolved oxygen in boiler water supply, it is characterized in that comprising the following steps:
The synthetic ammonia emptying gas of a, production of synthetic ammonia extracts hydrogen through carrying hydrogen production device;
B, extract tail gas after hydrogen and enter the gas stripping column bottom, tail gas carries out counter current contact with from top to bottom not deaerated water from bottom to top, and oxygen in water gas discharges with tail gas and is sent in the lump three wastes stove or air blown gas recovery unit, reclaims its latent heat;
C, the deaerated water after air lift enter gas stripping column bottom water tank, and the water sampling analysis after dissolved oxygen≤15mg/l, enters the deoxidation tank, by Boiler High Pressure pumping boiler.
2. method of removing dissolved oxygen in boiler water supply according to claim 1, it is characterized in that: if analyze through step c water sampling, dissolved oxygen 〉=15mg/l in deaerated water, can pass through the gas stripping column recycle pump, with below standard deaerated water be back to again in gas stripping column with tail gas again counter current contact carry out the air lift deoxygenation, until deaerated water dissolved oxygen≤15mg/l.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104466637A CN103112913A (en) | 2012-11-11 | 2012-11-11 | Method for removing dissolved oxygen in boiler water supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104466637A CN103112913A (en) | 2012-11-11 | 2012-11-11 | Method for removing dissolved oxygen in boiler water supply |
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| Publication Number | Publication Date |
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| CN103112913A true CN103112913A (en) | 2013-05-22 |
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| CN2012104466637A Pending CN103112913A (en) | 2012-11-11 | 2012-11-11 | Method for removing dissolved oxygen in boiler water supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111282403A (en) * | 2020-01-16 | 2020-06-16 | 河南莱帕克化工设备制造有限公司 | Three-tower absorption and desorption experimental device and process thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2132502B (en) * | 1982-12-28 | 1986-07-16 | Sintef | Method and apparatus for the removal of oxygen from water |
| GB2127711B (en) * | 1982-09-13 | 1987-02-11 | Norsk Hydro As | Degassing of water using inert gas |
| CN1079942A (en) * | 1992-11-23 | 1993-12-29 | 张佑全 | Hydrogen deoxidation Deadsorbing and oxygen removing method and device |
| US20060118064A1 (en) * | 2004-12-07 | 2006-06-08 | Westlake Chemical Corporation | Boiler feed water deaerator method and apparatus |
| CN101293938A (en) * | 2008-06-19 | 2008-10-29 | 湖北宜化集团有限责任公司 | Method for using recycled synthetic ammonia off-gas hydrogen in PVC preparation |
| CN201280447Y (en) * | 2008-08-29 | 2009-07-29 | 武奋超 | Circulating air lift deoxidization apparatus |
| GB2474559A (en) * | 2009-10-13 | 2011-04-20 | Bp Corp North America Inc | Deaeration of water |
-
2012
- 2012-11-11 CN CN2012104466637A patent/CN103112913A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2127711B (en) * | 1982-09-13 | 1987-02-11 | Norsk Hydro As | Degassing of water using inert gas |
| GB2132502B (en) * | 1982-12-28 | 1986-07-16 | Sintef | Method and apparatus for the removal of oxygen from water |
| CN1079942A (en) * | 1992-11-23 | 1993-12-29 | 张佑全 | Hydrogen deoxidation Deadsorbing and oxygen removing method and device |
| US20060118064A1 (en) * | 2004-12-07 | 2006-06-08 | Westlake Chemical Corporation | Boiler feed water deaerator method and apparatus |
| CN101293938A (en) * | 2008-06-19 | 2008-10-29 | 湖北宜化集团有限责任公司 | Method for using recycled synthetic ammonia off-gas hydrogen in PVC preparation |
| CN201280447Y (en) * | 2008-08-29 | 2009-07-29 | 武奋超 | Circulating air lift deoxidization apparatus |
| GB2474559A (en) * | 2009-10-13 | 2011-04-20 | Bp Corp North America Inc | Deaeration of water |
Non-Patent Citations (1)
| Title |
|---|
| 王仁祥等: "解吸除氧在热水锅炉上的应用", 《化学工业与工程技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111282403A (en) * | 2020-01-16 | 2020-06-16 | 河南莱帕克化工设备制造有限公司 | Three-tower absorption and desorption experimental device and process thereof |
| CN111282403B (en) * | 2020-01-16 | 2023-12-29 | 河南莱帕克化工设备制造有限公司 | Three-tower absorption and desorption experimental device and process thereof |
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Application publication date: 20130522 |