CN1415929A - Implementing method and device for protecting unused boilers by using fatty amine - Google Patents
Implementing method and device for protecting unused boilers by using fatty amine Download PDFInfo
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- CN1415929A CN1415929A CN 02146593 CN02146593A CN1415929A CN 1415929 A CN1415929 A CN 1415929A CN 02146593 CN02146593 CN 02146593 CN 02146593 A CN02146593 A CN 02146593A CN 1415929 A CN1415929 A CN 1415929A
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Abstract
This invention provides an operation method and special emulsion insertion equipments of an aliphate amine, especially stearlly ammine to protect steam system of idle boilers and steam turbines of steam-power plant including the following operational procedures: adding solid aliphatic amine to special emulsion insertion equipment several or several decades of hours before a steam-power pant stops boiler work to lead water or salt-eliminated water into a special emulsion insertion equipment to switch on power source or engine, the said equipment will turn aliphatic amine solid and water inlet suspended emulsion liquid with fine particles of aliphatic amine floating in water to be pressed with a certain pressures and flow rates the matched pressure transfer pump into steam system.
Description
The present invention relates to the anti-corrosion of metal resist technology, particularly the inactive corrosionproof protection technology of large scale industry boiler and thermal power station boiler and water-steam system.
At present, domestic aspect large scale industry boiler and the inactive corrosionproof protection of thermal power station unit, medicament aseptic technics such as employing aliphatic amide are popularized day by day, and have obtained certain effect and experience in application, for carrying out of this technology laid a good foundation.This technology is stopped standby aseptic technic with other and is compared, have use simple, protection domain is wide, the protection period is relatively long, do not need artificial interference, protection is effective, reagent consumption is little, labor capacity is less, can not constitute advantage such as pollution.Be stearylamine using maximum aliphatic amides aspect the corrosionproof protection of stopping using at present.
Stearylamine also claims octadecylamine, belongs to fatty amine, and its molecular formula is CH
3(CH
2)
16CH
2NH
2, the white waxy solid crystallization has alkalescence, is soluble in chloroform, is dissolved in ethanol, ether and benzene, is slightly soluble in acetone, is insoluble in water, and density is 860kg/m
3, 52.9 ℃ at zero pour, 348.8 ℃ of boiling points.Hydrolysis can take place in stearylamine in water, combine with part hydrogen ion in the water, and the hydroxide ion concentration in the solution increases relatively, and solution presents weakly alkaline.
Usually be mixed with organic impuritys such as cetylamine in the industry stearylamine product.Because cetylamine belongs to fatty amine equally, molecular structure and stearylamine are close, so equally with stearylamine can play the corrosionproof protection effect to metal.Someone attempts with multiple fat amine mixture can obtaining the excellent protection effect equally as sanitas.
Aliphatic amide has pungency to skin, eyes and mucous membrane, but can not poison because of suction.FDA is permitted when steaming food, and the concentration of stearylamine is no more than 3mg/l in the steam.Adopt aliphatic amide aseptic technics such as stearylamine in thermal power plant, it can not reach with concentration and have toxic scope.Aliphatic amides such as stearylamine can form unit molecule or the multimolecular film that one deck can be resisted oxygen and carbonic acid etch in the metallic surface, and the dissolved oxygen in the water can not be contacted with the metallic surface with hydrogen ion, have played the barrier buffer action.Film belongs to the physical and chemical adsorption effect with combining of metallic surface.
Because stearylamine is the same with other organic compound; have decomposition to a certain degree after being heated; so when power station heating power unit adopts stearylamine to stop using corrosionproof protection; generally stop the stage and carry out dosing in the unit outage cunning; requirement to the boiler heating power system during the dosing is the control superheat steam temperature, and it has been generally acknowledged that should be above 400 ℃.People's beginning dosing in tens of hours before unit outage is also arranged, to improve the quality of protective membrane.Stearylamine to add dose relevant with the situation of boiler water-steam system, the dose that adds of a common 200MW generating set is each tens of kilogram.After stearylamine adds therrmodynamic system, can be spread to whole water-steam system at short notice and form one deck hydrophobic nature preservative protective film in the metallic surface.Usually when boiler shutdown, adopt the discharge water method of waste heat oven dry of malleation to improve preservative effect.
Because of aliphatic amides such as stearylamine are insoluble in water, need adopt certain method and equipment to realize so they will be added the boiler water-steam system.Present implementation method mainly contains two kinds:
1. aliphatic amide such as stearylamine and water or de-mineralized water are heated to fusing, add the boiler water-steam system with volume pump after adding solubility promoter, defoamer and stirring into mixed solution.In actual application, the main drawback of this method is that soup is easy to solidify to the pipeline between the boiler water-steam system at volume pump and causes line clogging, there have been a lot of people to attempt adopting such method dosing failure, so this method is seldom used.
2. buy aliphatic amide emulsions such as stearylamine, add the boiler water-steam system with volume pump.Aliphatic amide emulsions such as stearylamine are that solid is made enough thin particle, and suspended dispersed is in water and the white emulsion that forms.Because the emulsion of buying, need add water or de-mineralized water dilution back usually than thickness and add the boiler water-steam system with volume pump.This method is used more general at present.
Have two with the Chinese patent application that the invention belongs to same field, be the prescription and the preparation method of aliphatic amide emulsions such as stearylamine, main summary of the invention is:
Patent application 96122576.9 discloses a kind of vapour phase corrosion inhibitor for high-pressure boiler and preparation method, formed by stearylamine, deionized water and tensio-active agent, oxygen scavenger, by weight, get stearylamine 10kg, deionized water 50kg or more than the 50kg, tensio-active agent 0.1～10kg, oxygen scavenger 0～30kg.During preparation with stearylamine 10kg earlier through pulverizing, add deionized water more gradually, put in the reactor, add tensio-active agent and oxygen scavenger, heat and remain on 50～95 ℃, stir more than 3 minutes or 3 minutes, be cooled to aqueous stearylamine.
Patent application 00115503.2 discloses a kind of new food preservative that is used for the heat power equipment Shut-down Protection and preparation method thereof; it adopts solvent to carry out two kinds of aliphatic amides composite; its prescription is (parts by weight): 6～9 parts of stearylamines, 1～4 part of cetylamine, 70～90 parts of solvents.The preparation method is: stearylamine is tentatively pulverized, further refine to grain diameter below 20 microns in thinning apparatus, add cetylamine and solvent in the thinning process, make thick sanitas product at last.
The method that adds boiler after the aliphatic amide emulsions such as purchase stearylamine has begun to use in power system, yet this method also has certain shortcoming:
1. pure stearylamine and pure water disperse the stable bad of the suspension emulsion that forms, and the stearylamine small-particle emerges easily and produces demixing phenomenon, and influence is used, so the shelf-time of emulsion is unsuitable oversize, is not easy to storage.And the number of times that station boiler is stopped using is few, and frequency of utilization is low, and long-term storage is inevitable.
2. in order to improve the stability of suspension emulsion, be added with stablizer usually in emulsion, this makes that the staging life of emulsion can be longer, but makes that simultaneously the medicament that adds boiler contains the impurity that boiler is not had benefit.Can produce organic acid under the high-temperature and high-pressure conditions of some impurity in boiler, steam turbine is had obvious corrosion.
3. the price comparison height of emulsion makes the comprehensive cost of implementing the inactive corrosionproof protection of power station heating power unit increase greatly.
As seen, prior art also has more inconvenience need overcome solution.
The present invention proposes a kind of aliphatic amide of using; particularly stearylamine is protected the implementation method and the special-purpose emulsifying injection device of water-steam systems such as inactive boiler in fuel-burning power plant and steam turbine; implementation method comprises following operating process: a few hours before the fuel-burning power plant is about to blowing out were to tens of hours; the aliphatic amide solid is added in the special-purpose emulsifying injection device; water or de-mineralized water are introduced the special-purpose emulsifying injection device by water pipe; connect special-purpose emulsifying injection device electrical source of power or open engine; the special-purpose emulsifying injection device is made the suspension emulsion that is suspended in water and formed by tiny aliphatic amide solid particulate with aliphatic amide solid and water; and by the positive delivery pump pressurization that is equipped with in the special-purpose emulsifying injection device; inject the Power Plant Water Vapor system with certain pressure and flow by pipeline; the shutdown operation program blowing out according to schedule of Power Plant Water Vapor system can reach good corrosionproof protection effect.
Aliphatic amide described in the present invention is meant the long chain alkyl primary amine that contains ten to 20 carbon atoms in the molecule, and common Industrial products have stearylamine, cetylamine, tetradecy lamine, amino dodecane, and their mixture such as hydrogenated tallow amine etc.Aliphatic amide solid among the present invention can be wherein a kind of, also can be the mixture that two or more aliphatic amides are formed.Composite anti-corrosive additive described in the present invention is generally materials such as the organic amine that contains several carbon atoms in ammonia, diamine, the molecule, organic polyamine.
The present invention has proposed to realize the special-purpose emulsifying injection device of above-mentioned implementation method simultaneously, and this special-purpose emulsifying injection device comprises aliphatic amide material container, broken dispersion and emulsion machinery, emulsion positive delivery pump, pipeline, power and water power control unit.
The aliphatic amide material container is used to deposit a certain amount of aliphatic amide, can adopt the down hopper of outlet usually, can have setting devices such as feeding machine, guarantees that broken dispersion and emulsion machinery works reliably.
Broken dispersion and emulsion machinery is used for aliphatic amide is refine to a certain degree, and mixes the formation suspension emulsion with water or de-mineralized water.The combination of one or more in the mill that broken dispersion and emulsion machinery can be crusher, stirrer, various types, dispersion machine, ultrasonic emulsification machine, the clarifixator.
The effect of emulsion positive delivery pump is that the suspension emulsion pressurization is sent into the boiler water-steam system with certain flow.
Power set provides mechanical energy for the machinery in the equipment, and according to user's principle easy to use, equipment of the present invention can adopt electric motor as power, also can adopt other engine fuels as power resources.
Water of the present invention, emulsion pipeline can adopt fixed, also can adopt the flexible pipe of being convenient to move.
The water power control unit is used for the supply and the operation of water, electricity are exercised supervision, measure, and assurance equipment normally moves, and comprises Monitoring and Controlling instrument and devices such as flow, pressure, liquid level, control valve.Control unit wherein can comprise automatic control system, can adopt from common relay and control to PLC, Computerized intelligent control.
According to the different structure characteristics of broken dispersion and emulsion machinery, emulsion positive delivery pump, can between broken dispersion and emulsion machinery and emulsion positive delivery pump, the suspension emulsion case be set.
According to the characteristics of the material properties of aliphatic amide, broken dispersion and emulsion machinery and suspension emulsion case, can between aliphatic amide material container and broken dispersion and emulsion machinery, be provided with quantitatively or metering feeding device.
These equipment can integratedly be installed on the base, make an integral device, also can make two or several single devices respectively, in use they are combined into a system.Obviously, it is more convenient in use to make the equipment of an integral body.
Characteristics of the present invention are: the medicine of implementing the needed purchase of this method is aliphatic amide pure substance and special-purpose emulsifying injection devices such as stearylamine, the special-purpose emulsifying injection device is an one-time investment, the aliphatic amide pure substance is not easy to go bad, anti-storage, price is low, volume is urinated in transportation, so use very convenient.If power plant adopts embodiment of the present invention to carry out the blowing out corrosionproof protection, calculate by present market value, comprehensive cost is less than buying 1/5th of aliphatic amide emulsion.
With certain 300MW of power plant condensing-type generating set is example, further specifies implementing method of the present invention.
Certain 300MW of power plant condensing-type generating set adopts pure stearylamine emulsion to carry out protection of boiler during shutdown period, and boiler is subcritical resuperheat natural circulation drum boiler, and maximum consecutive evaporation amount is 1025t/h, and superheated vapour pressure is 18.3MPa, and superheat steam temperature is 540 ℃.Steam turbine is a condensing turbine, and rated output is 300,000 kW, and vapor pressure is 16.7MPa before the main inlet throttle-stop valve, and vapor temperature is 537 ℃ before the main inlet throttle-stop valve.
The former employing of this unit is bought the mode of pure stearylamine emulsion and carried out Shut-down Protection, and performance is: Shut-down Protection medicine system equipment comprises 1 of Shut-down Protection dedicated pump 2000L/h, 1 of emulsion dissolving case 0.7m3.The protection of boiler during shutdown period technological process is: it is standby that blowing out was bought pure stearylamine emulsion 550kg (containing pure stearylamine 10%) in previous month.Begin medicine machine to be ready in preceding 4 hours in the compressor emergency shutdown program, adding 200kg concentration is 10% pure stearylamine emulsion in emulsion dissolving case, adds de-mineralized water 400kg, and is standby with the dilute emulsion that the agitator on the emulsion dissolving case stirs into about 3%.In the process of unit shutdown at sliding parameters, stop when superheat steam temperature is 450 ℃ when sliding, with the Shut-down Protection dedicated pump simultaneously to deaerator down-take pipe, rise the pure stearylamine emulsion of pumping intake piping adding 3% with withing fixed attention.After 10 minutes, 3% emulsion has added about 300kg, and adding into 100kg concentration in emulsion dissolving case is 10% pure stearylamine emulsion, adds de-mineralized water 200kg simultaneously, stirs into dilute emulsion about 3% with the agitator on the emulsion dissolving case.Later on along with 3% emulsion constantly adds boiler systems; constantly add 10% emulsion and de-mineralized water to emulsion dissolving case; emulsion up to 10% uses up and adds boiler systems, cleans emulsion dissolving case and Shut-down Protection dedicated pump with a small amount of de-mineralized water then, about 1 hour consuming time altogether.Keep more than the feedwater vapour cycle 1h, blowing out then, band presses the Rapid Thermal stove to discharge water, and utilizes waste heat that boiler is dried.
Now adopt method of the present invention and specific equipment to implement Shut-down Protection, implementation method is: special-purpose emulsifying injection device one cover of the present invention, the first half is bought pure stearylamine solid 200kg in blowing out, can use when three blowing outs.This takes 55kg.Begin preceding 1 hour with special-purpose emulsifying injection device connection de-mineralized water and power supply in the compressor emergency shutdown program, adding solid 15kg is standby in the special-purpose emulsifying injection device.In the process of unit shutdown at sliding parameters, when sliding stopping starts the special-purpose emulsifying injection device when superheat steam temperature is 450 ℃, the special-purpose emulsifying injection device is processed into stearylamine solid and de-mineralized water 3% emulsion and directly adds boiler systems.Divide adding solid 15kg in the clockwise special-purpose emulsifying injection device every 10-20, exhaust up to the 55kg solid.After about 5 minutes, the special-purpose emulsifying injection device enters wash phase after emulsion is added automatically.Clean that operator close the de-mineralized water valve after 3 minutes, the special-purpose emulsifying injection device is discharged the de-mineralized water in the equipment automatically, auto stop then, about 1 hour consuming time altogether.Keep more than the feedwater vapour cycle 1h, blowing out then, band presses the Rapid Thermal stove to discharge water, and utilizes waste heat that boiler is dried.
It is convenient that two kinds of implementation methods above the contrast, visible method of the present invention have the medicine deposit, and feeding operations is simple, the advantage that implementation cost is cheap.
Claims (8)
1; a kind of implementation method and special-purpose emulsifying injection device of protecting water-steam systems such as inactive boiler in fuel-burning power plant and steam turbine with aliphatic amide; it is characterized in that described implementation method comprises following operating process: a few hours before the fuel-burning power plant is about to blowing out were to tens of hours; the aliphatic amide solid is added in the special-purpose emulsifying injection device; water or de-mineralized water are introduced the special-purpose emulsifying injection device by water pipe; connect special-purpose emulsifying injection device electrical source of power or open engine; the special-purpose emulsifying injection device is made the suspension emulsion that is suspended in water and formed by tiny aliphatic amide solid particulate with aliphatic amide solid and water; and by the force (forcing) pump pressurization that is equipped with in the special-purpose emulsifying injection device; inject the Power Plant Water Vapor system with certain pressure and flow by pipeline; the shutdown operation program blowing out according to schedule of Power Plant Water Vapor system can reach good corrosionproof protection effect.
2, as claims 1 described implementation method of protecting water-steam systems such as inactive boiler in fuel-burning power plant and steam turbine with aliphatic amide, it is characterized in that adding the aliphatic amide solid simultaneously, also add a certain amount of composite anti-corrosive additive, improve preservative effect.
3,, it is characterized in that described special-purpose emulsifying injection device comprises aliphatic amide material container, broken dispersion and emulsion machinery, emulsion pressurization Send out pump, pipeline, power and water power control unit as claims 1,2 described special-purpose emulsifying injection devices.
4,, it is characterized in that described special-purpose emulsifying injection device also comprises the quantitative or metering feeding device of solid as claims 3 described special-purpose emulsifying injection devices.
5,, it is characterized in that described special-purpose emulsifying injection device also comprises the suspension emulsion case as claims 3,4 described special-purpose emulsifying injection devices.
6,, it is characterized in that the power resources in the described special-purpose emulsifying injection device are electric motor or engine fuel as claims 3,4,5 described special-purpose emulsifying injection devices.
7,, it is characterized in that the broken dispersion and emulsion machinery in the described special-purpose emulsifying injection device is one or more the combination in the mill of crusher, stirrer, various types, dispersion machine, ultrasonic emulsification machine, the clarifixator as claims 3,4,5 described special-purpose emulsifying injection devices.
8,, it is characterized in that described special-purpose emulsifying injection device is installed on the fixed or portable unsplit bedplate, or be installed in respectively on two or more bases as claims 3,4,5 described special-purpose emulsifying injection devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02146593 CN1415929A (en) | 2002-10-28 | 2002-10-28 | Implementing method and device for protecting unused boilers by using fatty amine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02146593 CN1415929A (en) | 2002-10-28 | 2002-10-28 | Implementing method and device for protecting unused boilers by using fatty amine |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100447304C (en) * | 2006-03-30 | 2008-12-31 | 武汉大学 | Film-forming inhibitor and preparation method thereof |
| CN101195919B (en) * | 2007-12-27 | 2010-07-28 | 武汉大学 | Film inhibitor and uses thereof |
| CN102500252A (en) * | 2011-11-11 | 2012-06-20 | 张啸 | High-dispersity and high-stability octadecyl amine emulsion processing equipment and process |
| CN105220136A (en) * | 2014-06-11 | 2016-01-06 | 北京京桥热电有限责任公司 | A kind of blowing out rust protection guard method of waste heat boiler unit |
| CN106191846A (en) * | 2015-04-29 | 2016-12-07 | 武汉大学 | Use the generating set Laying-up Protection of Thermal System guard method of 18-amine. |
-
2002
- 2002-10-28 CN CN 02146593 patent/CN1415929A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100447304C (en) * | 2006-03-30 | 2008-12-31 | 武汉大学 | Film-forming inhibitor and preparation method thereof |
| CN101195919B (en) * | 2007-12-27 | 2010-07-28 | 武汉大学 | Film inhibitor and uses thereof |
| CN102500252A (en) * | 2011-11-11 | 2012-06-20 | 张啸 | High-dispersity and high-stability octadecyl amine emulsion processing equipment and process |
| CN105220136A (en) * | 2014-06-11 | 2016-01-06 | 北京京桥热电有限责任公司 | A kind of blowing out rust protection guard method of waste heat boiler unit |
| CN105220136B (en) * | 2014-06-11 | 2018-02-09 | 北京京桥热电有限责任公司 | A kind of blowing out anti-corrosion guard method of waste heat boiler unit |
| CN106191846A (en) * | 2015-04-29 | 2016-12-07 | 武汉大学 | Use the generating set Laying-up Protection of Thermal System guard method of 18-amine. |
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