CN103925025B - A kind of boat diesel engine waste gas afterheat recovery unit - Google Patents
A kind of boat diesel engine waste gas afterheat recovery unit Download PDFInfo
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- CN103925025B CN103925025B CN201410158184.4A CN201410158184A CN103925025B CN 103925025 B CN103925025 B CN 103925025B CN 201410158184 A CN201410158184 A CN 201410158184A CN 103925025 B CN103925025 B CN 103925025B
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Abstract
The object of the present invention is to provide a kind of boat diesel engine waste gas afterheat recovery unit, mainly comprise the equipment such as boat diesel engine, exhaust heat boiler, turbine LP rotors, condenser, corrosion-resistant plate fin heat exchanger and desulfurizing tower.In the present invention, boat diesel engine waste gas produces steam through exhaust heat boiler, and some vapor is used for boats and ships consumption vapour equipment, and all the other steam input turbine LP rotors produces electric energy.For improving the boat diesel engine waste gas residual heat recovery rate, improving the desulphurization efficiency of desulfurizing tower simultaneously, between exhaust heat boiler and desulfurizing tower, arranging that corrosion-resistant plate fin heat exchanger reduces exhaust gas temperature further.The present invention can fully reclaim boat diesel engine waste gas residual heat, increase UTILIZATION OF VESIDUAL HEAT IN scope, improve utilization rate of waste heat, and effectively can alleviate the cold end corrosion of exhaust heat boiler back-end surfaces, overcome that prior art energy saving is poor, the feature of environmental protection is poor, cost is high and the defect such as poor reliability, reach energy-saving and environmental protection, reduce costs and improve the object of equipment reliability.
Description
Technical field
What the present invention relates to is a kind of marine diesel machine, specifically boat diesel engine waste gas utilization device.
Background technique
Current energy problem has become an all in all problem in economic development, and boats and ships are means of transportation that energy ezpenditure is huge, and high energy consumption makes vessel motion cost increase on the one hand, also brings serious environmental problem on the other hand.
EEDI (EnergyEfficiencyDesignIndex, the new ship Energy design index) rule of the up-to-date formulation of International Maritime Organization IMO has clear and definite requirement to emissions reduction, reduction boats and ships energy consumption.The low-yield utilization ratio of boats and ships, except by except the fuel cost of great number, also by the face of extra fine, to compensate the destruction to environment.Therefore, boats and ships energy consumption is effectively reduced very urgent with discharge.The equipment of fuel is used to have diesel main engine, subsidiary engine and donkey boiler etc. in boats and ships.Wherein, diesel main engine consume fuel is maximum, fuel burns sent net quantity of heat in cylinder of diesel engine, 45 ~ 50% are only had to change mechanical work into, waste gas has taken away the energy accounting for fuel gross calorific power 25 ~ 30%, because diesel engine row temperature is higher, heat energy from waste gas quality is higher, has very large acting potentiality.Diesel residual heat reclaiming system effectively can utilize exhaust energy, and produces the electric power output being equivalent to main engine power 11%.If diesel main engine waste gas can be utilized to generate electricity or provide steam for supplementary equipment thermal source, then can Substitute For Partial subsidiary engine and donkey boiler, reach the effect of energy-saving and emission-reduction.The waste heat of abundant recovery marine main engine is significant.
The mean temperature of marine low speed diesel exhaust is at about 260 DEG C, about 95 DEG C are reduced to through ultralow temperature heat boiler outlet exhaust gas temperature, lower than acid dew-point temperature, exhaust heat boiler back-end surfaces will be corroded, shorten exhaust heat boiler working life, increase residual neat recovering system cost, reduce its reliability.For avoiding the cold end corrosion of exhaust heat boiler back-end surfaces, heat boiler outlet place flue-gas temperature need be controlled at about 160 DEG C.In addition, the desulphurization efficiency of exhaust gas entrance temperature on Wet Flue Gas Desulfurization Technique has larger impact, and when temperature is too high, desulphurization efficiency is very low.
It is the exhaust heat recovery generator system proposing a kind of boats and ships incinerator and diesel powerplant in the patent " residual neat recovering system of a kind of boats and ships incinerator and power plant and recovery method " of 201310325318.2 at application number, the total hot flue of this Operation system setting, to pass into exhaust heat boiler and produces high-temperature steam supply gas utilization unit and generate electricity by high-temp waste gas.Although the energy of high-temp waste gas is utilized further, and heat boiler outlet exhaust gas temperature is reduced to about 170 DEG C, waste gas now also has very high value.
Be propose a kind of wet flue gas desulfurization tower being provided with pre-spraying ventilating device in the patent " wet flue gas desulfurization tower " of 201020197317.6 at application number.Although pre-spraying ventilating device significantly reduces desulfurizing tower inlet flue gas temperature, thus improves the desulphurization efficiency of desulfurizing tower, this process causes the waste of a large amount of gas energy.
Summary of the invention
The object of the present invention is to provide while minimizing exhaust heat boiler back-end surfaces and the corrosion of cryogenic heat exchanger surface low-temperature again can abundant recovery waste heat boiler export waste gas residual heat, and the SOX that can more effectively wash in boat diesel engine waste gas and particle, reduce a kind of boat diesel engine waste gas afterheat recovery unit of the pollution to naval air environment.
The object of the present invention is achieved like this:
A kind of boat diesel engine waste gas afterheat recovery unit of the present invention, it is characterized in that: comprise desulfurizing tower, heat exchanger, booster fan, exhaust heat boiler, drum, hot well, the first-six three-way valve, the first-the second water pump, boat diesel engine waste gas passes into the lower end of exhaust heat boiler through the first three-way valve, discharge from the upper end of exhaust heat boiler again, after booster fan pressurization, pass into heat exchanger through the 4th three-way valve, after the 5th three-way valve passes into desulfurizing tower washing desulphurization, enter air, the outlet of booster fan is connected with the 4th three-way valve, 4th three-way valve is connected with the hot fluid import of heat exchanger, the hot fluid outlet ports of heat exchanger is connected with the 5th three-way valve, 5th three-way valve is connected with the exhaust gas inlet of desulfurizing tower, 4th three-way valve is connected with the 6th three-way valve, 5th three-way valve is connected with the 6th three-way valve, the cold fluid inlet of heat exchanger is connected with the second water delivery side of pump, the entrance of the second water pump is connected with hot well, the cold fluid outlet of heat exchanger is connected with the water heater entrance of exhaust heat boiler, the entrance of booster fan is connected with the outlet of exhaust heat boiler, 6th three-way valve is connected with the waste gas outlet of desulfurizing tower, the exhaust heat boiler feedwater of extracting out from hot well through the first water pump extract out from hot well with the second water pump after exhaust heat boiler after heat exchanger preheating feed water conflux after control to enter the water heater of exhaust heat boiler through the 3rd three-way valve, drum is flowed into after exhaust heat boiler feedwater after confluxing is heated into steam water interface in water heater, gas-liquid separation in drum, liquid after gas-liquid separation flows into drum after the effect next part of recycle pump enters vaporizer heating, and remaining part flows into the process after drum after repeating steam water interface after entering water heater heating, the isolated saturated vapour of drum is divided into two-part, and a part of saturated vapour flows into boats and ships gas utilization unit, flows into hot well afterwards, the saturated vapour inflow superheater of remainder is heated to form high temperature super heated steam and does work through the second three-way valve control inputs steam turbine, and drives electrical power generators, and the steam after acting flows into hot well after condenser condenses.
The present invention can also comprise:
1, described heat exchanger adopts resistant material ND steel and 09CrCuSb steel as heating surface tubing, and at its surface coating corrosion resistant coating.
Advantage of the present invention is:
(1) energy-conservation.In the energy-saving emission-reducing apparatus realized utilizing the present invention, diesel exhaust is successively by exhaust heat boiler and corrosion-resistant plate fin heat exchanger, fully reclaim the energy in diesel exhaust waste heat, exhaust gas temperature is reduced to the value meeting wet desulfurizing process requirement, avoid the gas energy waste that flue gas spraying cooling process causes, improve capacity usage ratio; Meanwhile, greatly reduce the water yield that sweetening process is the spray equipment consumption reducing exhaust gas temperature and arrange in desulfurizing tower ingress, save a large amount of water resourcess.
(2) environmental protection.By this waste heat recovering device, desulfurizing tower waste air temperature at inlet is reduced to 60 ~ 75 DEG C, improves the desulphurization efficiency of desulfurizing tower, reduce the pollution to ocean environment.In addition, whole waste gas afterheat recovery system can reduce the consumption of the energy, also namely decreases the discharge of CO2, SO2, NOX, produces huge environmental benefit.
(3) Economy and good reliability.The present invention arranges corrosion-resistant plate fin heat exchanger after exhaust heat boiler, heat boiler outlet place exhaust gas temperature can be controlled more than acid dew point on the one hand while fully reclaiming boat diesel engine waste gas residual heat, effectively improve the cold end corrosion situation of exhaust heat boiler back-end surfaces, extend the working life of exhaust heat boiler; On the other hand, corrosion-resistant plate fin heat exchanger adopts resistant material ND steel (i.e. 09CrCuSb steel) as heating surface tubing, and at its surface coating corrosion resistant coating effectively to delay the cold end corrosion of heat exchanger fume side heating surface.Which thereby enhance the Economy of whole residual neat recovering system, ensure that the safety and reliability of residual neat recovering system running simultaneously.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing citing, the present invention is described in more detail:
In composition graphs 1, figure, diesel exhaust waste heat is successively used through exhaust heat boiler 3 and corrosion-resistant plate fin heat exchanger 13.
In figure, the outlet of booster fan 12 is connected with three-way valve 2-4, three-way valve 2-4 is connected with the hot fluid import of plate-fin heat exchanger 13, the hot fluid outlet ports of plate-fin heat exchanger 13 is connected with three-way valve 2-5, three-way valve 2-5 is connected with the exhaust gas inlet of desulfurizing tower 14, three-way valve 2-4 is connected with three-way valve 2-6, three-way valve 2-5 is connected with three-way valve 2-6, the cold fluid inlet of plate-fin heat exchanger 13 is connected with the outlet of water pump 10-2, the entrance of water pump 10-2 is connected with hot well 11, the cold fluid outlet of plate-fin heat exchanger 13 is connected with the water heater entrance of exhaust heat boiler 3, the entrance of booster fan 12 is connected with the outlet of exhaust heat boiler, three-way valve 2-6 is connected with the waste gas outlet of desulfurizing tower 14.
In figure, boat diesel engine 1 waste gas controls to pass into exhaust heat boiler 3 through three-way valve 2-1 and heats exhaust heat boiler feedwater, after booster fan 12 pressurizes, control through three-way valve 2-4 the feedwater passing into corrosion-resistant plate fin heat exchanger 13 preheating exhaust heat boiler 3 again, after controlling to pass into desulfurizing tower 14 washing desulphurization finally by three-way valve 2-5, enter air.
In figure, after the exhaust heat boiler feedwater of extracting out from hot well 11 through water pump 10-1 and the exhaust heat boiler after water pump 10-2 extracts out from hot well 11 after corrosion-resistant plate fin heat exchanger 13 preheating feed water and conflux, control to enter the water heater of exhaust heat boiler 3 through three-way valve 2-3; Drum 4 is flowed into after exhaust heat boiler feedwater is heated into steam water interface in water heater, gas-liquid separation in drum 4, liquid after gas-liquid separation flows into drum 4 after the effect lower part of recycle pump 5 enters vaporizer heating, the process before remaining part repeats after entering water heater heating; The isolated high temperature saturated vapour of drum 4 is divided into two-part, and a part flows into boats and ships gas utilization unit 9, for the daily heating of boats and ships, flow into hot well 11 afterwards; Remaining high temperature saturated vapour inflow superheater is heated to form high temperature super heated steam and does work through three-way valve 2-2 control inputs steam turbine 6, and drives generator 7 to generate electricity, and the steam after acting flows into hot well 11 after condenser 8 condensation.
Corrosion-resistant plate fin heat exchanger adopts resistant material ND steel (i.e. 09CrCuSb steel) as heating surface tubing, and at its surface coating corrosion resistant coating to delay the cold end corrosion of heat exchanger fume side heating surface.
Controlled the trend of heat boiler outlet waste gas by operation three-way valve 2-4,2-5,2-6, corrosion-resistant plate fin heat exchanger 13 and desulfurizing tower 14 are being broken down and between turn(a)round, residual neat recovering system can normally continuously work.
The boat diesel engine waste gas afterheat recovery unit of a kind of effective minimizing cold end corrosion of the present invention, primarily of equipment compositions such as boat diesel engine, exhaust heat boiler, turbine LP rotors, condenser, corrosion-resistant plate fin heat exchanger and desulfurizing towers.The mean temperature of marine low speed diesel smoke, at about 260 DEG C, has very high value, and the heat that the present invention make use of boat diesel engine high-temperature flue gas well produces high-temperature steam supply gas utilization unit and generates electricity; For avoiding the cold end corrosion of exhaust heat boiler back-end surfaces, heat boiler outlet exhaust gas temperature being controlled more than acid dew point, after exhaust heat boiler, arranging that corrosion-resistant plate fin heat exchanger is with the heat in recovery waste heat boiler export waste gas effectively simultaneously.
Between exhaust heat boiler and desulfurizing tower, arrange corrosion-resistant plate fin heat exchanger, and arrange booster fan between heat boiler outlet and three-way valve 2-4.The thermal source working medium of corrosion-resistant plate fin heat exchanger is heat boiler outlet high-temp waste gas, and low-temperature receiver working medium is recirculated cooling water after treatment.Cooling water is evacuated to from hot well the low-temperature receiver working medium ingress of heat exchanger through water pump, after the heating of corrosion-resistant plate fin heat exchanger, exports the heater inlet of exhaust heat boiler from low-temperature receiver sender property outlet to.
Corrosion-resistant plate fin heat exchanger using resistant material ND steel (i.e. 09CrCuSb steel) as heating surface tubing, and carries out anti-corrosion treatment to delay the cold end corrosion of heat exchanger fume side heating surface at its surface coating corrosion resistant coating.
Arrange bypass flue I to draw through three-way valve 2-6 to desulfurizing tower outlet port from three-way valve 2-4; By-pass line II to be drawn through three-way valve 2-6 to desulfurizing tower outlet port from three-way valve 2-5, and corrosion-resistant plate fin heat exchanger and desulfurizing tower are being broken down and between turn(a)round, residual neat recovering system can normally continuously work.
Corrosion-resistant plate fin heat exchanger is arranged between exhaust heat boiler and desulfurizing tower, and arranges booster fan between exhaust heat boiler waste gas outlet and three-way valve 2-4.
The thermal source working medium of corrosion-resistant plate fin heat exchanger is heat boiler outlet high-temp waste gas, and low-temperature receiver working medium is recirculated cooling water after treatment.Cooling water is evacuated to from hot well the low-temperature receiver working medium ingress of heat exchanger through water pump, after the heating of corrosion-resistant plate fin heat exchanger, exports the heater inlet of exhaust heat boiler from low-temperature receiver sender property outlet to.
Arrange bypass flue I to draw through three-way valve 2-6 to desulfurizing tower outlet port from three-way valve 2-4; By-pass line II is drawn through three-way valve 2-6 to desulfurizing tower outlet port from three-way valve 2-5.
Claims (2)
1. a boat diesel engine waste gas afterheat recovery unit, it is characterized in that: comprise desulfurizing tower, heat exchanger, booster fan, exhaust heat boiler, drum, hot well, the first-six three-way valve, the first-the second water pump, boat diesel engine waste gas passes into the lower end of exhaust heat boiler through the first three-way valve, discharge from the upper end of exhaust heat boiler again, after booster fan pressurization, pass into heat exchanger through the 4th three-way valve, after the 5th three-way valve passes into desulfurizing tower washing desulphurization, enter air, the outlet of booster fan is connected with the 4th three-way valve, 4th three-way valve is connected with the hot fluid import of heat exchanger, the hot fluid outlet ports of heat exchanger is connected with the 5th three-way valve, 5th three-way valve is connected with the exhaust gas inlet of desulfurizing tower, 4th three-way valve is connected with the 6th three-way valve, 5th three-way valve is connected with the 6th three-way valve, the cold fluid inlet of heat exchanger is connected with the second water delivery side of pump, the entrance of the second water pump is connected with hot well, the cold fluid outlet of heat exchanger is connected with the water heater entrance of exhaust heat boiler, the entrance of booster fan is connected with the outlet of exhaust heat boiler, 6th three-way valve is connected with the waste gas outlet of desulfurizing tower, the exhaust heat boiler feedwater of extracting out from hot well through the first water pump extract out from hot well with the second water pump after exhaust heat boiler after heat exchanger preheating feed water conflux after control to enter the water heater of exhaust heat boiler through the 3rd three-way valve, drum is flowed into after exhaust heat boiler feedwater after confluxing is heated into steam water interface in water heater, gas-liquid separation in drum, liquid after gas-liquid separation flows into drum after the effect next part of recycle pump enters vaporizer heating, and remaining part flows into the process after drum after repeating steam water interface after entering water heater heating, the isolated saturated vapour of drum is divided into two-part, and a part of saturated vapour flows into boats and ships gas utilization unit, flows into hot well afterwards, the saturated vapour inflow superheater of remainder is heated to form high temperature super heated steam and does work through the second three-way valve control inputs steam turbine, and drives electrical power generators, and the steam after acting flows into hot well after condenser condenses.
2. a kind of boat diesel engine waste gas afterheat recovery unit according to claim 1, is characterized in that: described heat exchanger adopts resistant material ND steel and 09CrCuSb steel as heating surface tubing, and at its surface coating corrosion resistant coating.
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| CN104265427A (en) * | 2014-08-07 | 2015-01-07 | 哈尔滨工程大学 | Medium speed diesel engine waste gas desulfurization and waste heat recovery combined cycle system for ship |
| CN104353357A (en) * | 2014-10-22 | 2015-02-18 | 哈尔滨工程大学 | Integrated exhaust gas scrubbing desulfuration equipment for ship power device and control method |
| CN104390200A (en) * | 2014-11-21 | 2015-03-04 | 张家港格林沙洲锅炉有限公司 | Marine exhaust gas waste heat boiler |
| CN104612769A (en) * | 2014-12-22 | 2015-05-13 | 哈尔滨工程大学 | Method for designing waste heat generating system of marine main engine |
| JP6670123B2 (en) * | 2016-02-19 | 2020-03-18 | 株式会社神戸製鋼所 | Exhaust heat recovery device and binary power generation device |
| CN105928050B (en) * | 2016-04-07 | 2020-10-23 | 中国舰船研究设计中心 | Ship waste heat heating system and method based on heat pipe waste heat economizer |
| JP6513602B2 (en) * | 2016-06-10 | 2019-05-15 | 三菱重工業株式会社 | Exhaust heat recovery system, ship equipped with the same, and exhaust heat recovery method |
| CN106492608B (en) * | 2016-10-17 | 2019-03-19 | 大连海事大学 | A kind of ship multichannel flue heat exchange low-resistance is connected to EGCs devices and methods therefor |
| CN110975568A (en) * | 2019-11-27 | 2020-04-10 | 惠生（南通）重工有限公司 | Utilize boats and ships exhaust-gas treatment system of PCHE vaporizer cooling |
| CN112377882A (en) * | 2020-10-13 | 2021-02-19 | 中广核工程有限公司 | Nuclear power station starting boiler and emergency generator combined working system |
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