CN102817648A - Residue heat power generating system - Google Patents
Residue heat power generating system Download PDFInfo
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- CN102817648A CN102817648A CN2012103384748A CN201210338474A CN102817648A CN 102817648 A CN102817648 A CN 102817648A CN 2012103384748 A CN2012103384748 A CN 2012103384748A CN 201210338474 A CN201210338474 A CN 201210338474A CN 102817648 A CN102817648 A CN 102817648A
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Abstract
The invention relates to a residue heat power generating system, and in particular relates to a residue heat power generating system which can effectively prevent the low-temperature corrosion generation, and also can effectively prevent a water supply pump from generating cavitation. The residue heat power generating system comprises a coal economizer, a heat exchanger, a water supply pump, a controller, a sulfur oxide instrument, a temperature testing element, a steam turbine power generating set, a flow rate control regulating valve and the like; and the controller sends a signal instruction to the flow rate control regulating valve according to the testing results of the sulfur oxide instrument and the temperature testing element, and regulates the flow rate of high-temperature media entering the heat exchanger. The residue heat power generating system provided by the invention is provided with the heat exchanger, can effectively regulate the boiler water supply temperature at the inlet of the coal economizer, can effectively prevent the coal economizer from generating low-temperature corrosion, and also can effectively prevent the low boiler efficiency caused by over-high running temperature of the coal economizer, thus the residue heat power generating system always operates to achieve the highest state of power generation efficiency under the premise that the coal economizer is not subjected to low-temperature corrosion.
Description
Technical field
The present invention relates to a kind of afterheat generating system, relate in particular to a kind of afterheat generating system that can effectively prevent cold end corrosion, can also effectively prevent feed water pump generation cavitation.
Background technique
Along with the whole world to the attention of environmental problem and raising that energy-saving and emission-reduction are required; Heat recovery technology has obtained fast development; The cogeneration technology of industrial furnace has obtained large scale application in China, and huge contribution has been made in the energy-saving and emission-reduction work of China.Contain certain sulphur content in the middle of the fuel such as the heavy oil of industrial furnace burning, petroleum coke; Contain in the middle of the flue gas and have corrosive sulfur dioxide; When the industrial furnace flue gas waste heat recovery equipment is dealt with improperly in the design and running process; Sulfur in smoke causes the acid etching problem of waste heat recovery apparatus easily, influences the normal operation of waste heat recovery apparatus, reduces the Security and the Economy of residual neat recovering system.The water temperature of exhaust heat boiler economizer is than flue-gas temperature is low here, and the heat-transfer coefficient between water and economizer wall is than more than the big one magnitude of the heat-transfer coefficient between flue gas and economizer wall.Therefore, the economizer wall surface temperature is more near water temperature.The conventional method of avoiding economizer generation cold end corrosion is the dew point temperature that is higher than flue gas through the flue-gas temperature that improves the economizer place.If the water temperature of economizer is lower, have only that temperature of exhaust fume is very high might to guarantee that just cold end corrosion does not take place economizer, the temperature of exhaust fume height causes exhaust heat boiler efficient to reduce significantly.For these reasons, the temperature of exhaust fume of a large amount of exhaust heat boilers of operation is many more than 160 to 200 ℃ at present, even the temperature of exhaust fume of exhaust heat boiler is so high, when the concentration of sulfur in smoke was higher, the cold end corrosion problem of economizer was also very serious.
After improving the pressure and temperature of oxygen-eliminating device, the temperature of economizer also can correspondingly improve, and can avoid taking place the acid etching problem of economizer.But, after the temperature of raising oxygen-eliminating device, the corresponding raising of the operating temperature of feed water pump, working environment worsens.Under present technical specifications, the feedwater flow of afterheat generating system is little, also there is the technical barrier that is difficult to overcome in the boiler feed pump of HTHP.When running temperature was higher than 135 ℃, serious cavitation problem took place in the feed water pump of exhaust heat boiler easily, and the life-span of feed water pump reduces significantly, threatens the safe and stable operation of afterheat generating system.
Summary of the invention
The object of the present invention is to provide afterheat generating system; Can solve the cold end corrosion and the feed water pump cavitation problem of economizer; Can also effectively regulate the feed temperature of economizer; Control the temperature of exhaust fume of exhaust heat boiler to a certain extent, improve the security and stability and the generating efficiency of afterheat generating system.
To achieve these goals, the technological scheme of employing is following:
Afterheat generating system is characterized in that, comprises exhaust heat boiler and Turbo-generator Set,
Along the flow of flue gas direction superheater, vaporizer and economizer are set in the flue of exhaust heat boiler;
The low temperature inlet/outlet of heat exchanger is connected with feed water pump and economizer respectively, and the outlet of economizer is connected with the high temperature import of drum, heat exchanger respectively;
Drum is connected with the inlet/outlet of vaporizer, and drum is connected with superheater, and superheater is connected with live steam pipe;
Turbo-generator Set comprises generator, the steam turbine that is connected with generator, and the steam inlet of steam turbine is connected with live steam pipe, and its exhaust steam outlet is connected with vapour condenser;
The extraction opening of steam turbine is connected with oxygen-eliminating device through exhaust tube, and oxygen-eliminating device is connected with vapour condenser through condensate pump;
Oxygen-eliminating device is connected with feed water pump through boiler feed pipe, and drum is connected with oxygen-eliminating device through the drum by-pass valve;
The high temperature import of heat exchanger is connected with drum, and the high temperature outlet of heat exchanger is connected with oxygen-eliminating device through return pipe;
The connecting pipe of heat exchanger and drum is provided with flow regulating and controlling valve and heat exchanger main valve, and the connecting pipe of the high temperature import of heat exchanger and the outlet of economizer is provided with the heat exchanger by-pass valve.
Further, also be provided with the sulfur dioxide appearance in the said flue.
Further, the low-temperature zone wall of said economizer is provided with temperature measuring element.
Further, also include controller, said controller is connected with temperature measuring element with flow regulating and controlling valve, sulfur dioxide appearance respectively.
Further, said live steam pipe is connected with oxygen-eliminating device through the live steam by-pass valve.
Afterheat generating system of the present invention; Heat exchanger is set; Can effectively adjust the boiler feed temperature of economizer import, can effectively prevent economizer generation cold end corrosion, also can effectively prevent the too high efficiency of boiler that causes of economizer running temperature problem on the low side; Make afterheat generating system always work in economizer and do not take place under the prerequisite of cold end corrosion, generating efficiency reaches high state.Compared with prior art, beneficial effect of the present invention shows:
1, according to the tube wall temperature that detects sulfur in smoke concentration and economizer low-temperature zone; Adjustment gets into the flow of the high temperature media of heat exchanger; The tube wall temperature that guarantees the economizer low-temperature zone is a little more than acid dew-point temperature; Guarantee that cold end corrosion does not take place economizer, effectively improves the Security of afterheat generating system.
2, when the concentration of sulfur in smoke is hanged down; Reduce the flow that high temperature media gets into heat exchanger, reduce the caloric receptivity of boiler feed water, guaranteeing that the economizer low-temperature zone does not take place under the prerequisite of cold end corrosion at heat exchanger; Reduce the running temperature of economizer; Strengthen the heat transfer temperature difference of flue gas and economizer, increase the caloric receptivity of economizer, reduce the efficient of exhaust gas temperature, raising boiler.
3, improve the feed temperature of economizer inlet through heat exchanger, guarantee that cold end corrosion does not take place economizer.Adopt this technical approach; Can adopt the deoxygenation of low temperature oxygen-eliminating device, guarantee that fully the oxygen-removing water temperature of the feed water pump of flowing through is lower under the prerequisite of deaerating effect; Compare with the high temperature oxygen-eliminating device; The temperature environment of feed water pump work is improved significantly, and the rate of fault of feed water pump reduces significantly, service life increases substantially, and the security and stability of afterheat generating system increases substantially.
Description of drawings
For the ease of it will be appreciated by those skilled in the art that the present invention is further described below in conjunction with accompanying drawing.
Fig. 1 is the flow chart of afterheat generating system of the present invention.
Embodiment
See also Fig. 1, along the flow of flue gas direction superheater 24, vaporizer 23, economizer 2 and sulfur dioxide appearance 4 are set in the flue 25 of exhaust heat boiler 1, the low-temperature zone wall of economizer 2 is provided with temperature measuring element 3.
The low temperature inlet/outlet of heat exchanger 6 is connected with feed water pump 7 and economizer 2 respectively, and the outlet of economizer 2 is connected with the high temperature import of drum 21, heat exchanger 6 respectively.
Drum 21 is connected with the inlet/outlet of vaporizer 23, and drum 21 is connected with superheater 24, and superheater 24 is connected with live steam pipe 22.
Turbo-generator Set comprises generator 13, the steam turbine 14 that is connected with generator 13, and the steam inlet of steam turbine 14 is connected with live steam pipe 22, and its exhaust steam outlet is connected with vapour condenser 11.
The extraction opening of steam turbine 14 is connected with oxygen-eliminating device 16 through exhaust tube 12, and oxygen-eliminating device 16 is connected with vapour condenser 11 through condensate pump 10.
Oxygen-eliminating device 16 is connected with feed water pump 7 through boiler feed pipe 9, and drum 21 is connected with oxygen-eliminating device 16 through drum by-pass valve 18, and live steam pipe 22 is connected with oxygen-eliminating device 16 through live steam by-pass valve 15.
The high temperature import of heat exchanger 6 is connected with drum 21, and the high temperature outlet of heat exchanger 6 is connected with oxygen-eliminating device 16 through return pipe 8.
Heat exchanger 6 is provided with flow regulating and controlling valve 17 and heat exchanger main valve 19 with the connecting pipe of drum 21, and the connecting pipe of the high temperature import of heat exchanger 6 and the outlet of economizer 2 is provided with heat exchanger by-pass valve 20.
Controller 5 is connected with flow regulating and controlling valve 17, sulfur dioxide appearance 4 and temperature measuring element 3 respectively.Controller 5 sends instruction according to the signal that sulfur dioxide appearance 4 and temperature measuring element 3 provide to flow regulating and controlling valve 17; The aperture of adjustment flow regulating and controlling valve 17 changes the high temperature media flow that gets into heat exchanger 6; The running temperature of final control economizer 2 is a little more than acid dew-point temperature; Avoid economizer 2 that cold end corrosion takes place, also avoid the too high efficiency of boiler that causes of entering water temp of economizer 2 to reduce.
Concrete working procedure of the present invention is following:
From about 104 ℃ oxygen-removing water of oxygen-eliminating device 16 after feed water pump 7 pressurizations; Get into heat exchanger 6 from the low temperature import; High temperature media from drum 21 gets into heat exchanger 6 from the high temperature inlet, and oxygen-removing water heats the back and gets into economizer 2 in heat exchanger 6, and the tube wall temperature of economizer 2 low-temperature zone is a little more than acid dew-point temperature; Avoid economizer generation cold end corrosion, in heat exchanger 6, get into oxygen-eliminating device 16 after the heat release from the high temperature media of drum 21.
Oxygen-removing water gets into drum 21 after economizer 2 heating, drum 21 is connected with vaporizer 23, leaves the 24 further heating of drum 21 entering superheaters fractional saturation water becomes saturated vapour in vaporizer 23 after and becomes superheated vapor.Superheated vapor gets into steam turbine 14 through live steam pipe 22, and pushing generator 13 generatings.The exhaust steam of leaving steam turbine 14 gets into vapour condenser 11 and is transformed into water of condensation, and water of condensation is transported to oxygen-eliminating device 16 through condensate pump 10.Steam turbine 14 extracts part steam and gets into oxygen-eliminating device 16 through extraction steam pipe 12, to getting into the water of condensation heating and the deoxygenation of oxygen-eliminating device 16.
Be arranged on flue 25 interior sulfur dioxide appearance 4 and measure the concentration of sulfur dioxide in flue gas; Calculate acid dew-point temperature t0, according to the target temperature value t1 of t0 setting economizer low-temperature zone, and t1=t0+C; C is the corrosion protection surplus, and span is generally between 1-20 ℃.The temperature value t2 and the t1 that are installed in temperature measuring element 3 mensuration on the economizer 2 low-temperature zone tube walls compare:
(1), as t2 during less than t1, controller 5 sends out big instruction to flow regulating and controlling valve 17, the high temperature media that gets into heat exchanger 6 increases.
(2), as t2 during greater than t1, controller 5 sends to flow regulating and controlling valve 17 and reduces instruction, the high temperature media that gets into heat exchanger 6 reduces.
The high temperature media that derives from drum 21 can be a saturated vapour, also can be saturation water.
When steam turbine 14 not when oxygen-eliminating device 16 provides steam: open live steam by-pass valve 15, provide steam to carry out deoxygenation to the water of condensation that gets into oxygen-eliminating device 16 by live steam pipe 22.Perhaps, open drum by-pass valve 18, provide saturated vapour to carry out deoxygenation to the water of condensation of oxygen-eliminating device 16 by drum 21.
When drum 21 not when heat exchanger 6 provides high temperature media, can open heat exchanger by-pass valve 20, draw high temperature media to heat exchanger 6 heat supplies by the outlet of economizer 2.
Above content only is to give an example and explanation to what structure of the present invention was done; Under the technician in present technique field described specific embodiment is made various modifications or replenish or adopt similar mode to substitute; Only otherwise depart from the structure of invention or surmount the defined scope of these claims, all should belong to protection scope of the present invention.
Claims (5)
1. afterheat generating system is characterized in that, comprises exhaust heat boiler and Turbo-generator Set,
Along the flow of flue gas direction superheater, vaporizer and economizer are set in the flue of exhaust heat boiler;
The low temperature inlet/outlet of heat exchanger is connected with feed water pump and economizer respectively, and the outlet of economizer is connected with the high temperature import of drum, heat exchanger respectively;
Drum is connected with the inlet/outlet of vaporizer, and drum is connected with superheater, and superheater is connected with live steam pipe;
Turbo-generator Set comprises generator, the steam turbine that is connected with generator, and the steam inlet of steam turbine is connected with live steam pipe, and its exhaust steam outlet is connected with vapour condenser;
The extraction opening of steam turbine is connected with oxygen-eliminating device through exhaust tube, and oxygen-eliminating device is connected with vapour condenser through condensate pump;
Oxygen-eliminating device is connected with feed water pump through boiler feed pipe, and drum is connected with oxygen-eliminating device through the drum by-pass valve;
The high temperature import of heat exchanger is connected with drum, and the high temperature outlet of heat exchanger is connected with oxygen-eliminating device through return pipe;
The connecting pipe of heat exchanger and drum is provided with flow regulating and controlling valve and heat exchanger main valve, and the connecting pipe of the high temperature import of heat exchanger and the outlet of economizer is provided with the heat exchanger by-pass valve.
2. afterheat generating system according to claim 1 is characterized in that, also is provided with the sulfur dioxide appearance in the said flue.
3. afterheat generating system according to claim 1 is characterized in that, the low-temperature zone wall of said economizer is provided with temperature measuring element.
4. according to each described afterheat generating system of claim 1-3, it is characterized in that, also include controller, said controller is connected with temperature measuring element with flow regulating and controlling valve, sulfur dioxide appearance respectively.
5. according to each described afterheat generating system of claim 1-3, it is characterized in that said live steam pipe is connected with oxygen-eliminating device through the live steam by-pass valve.
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| CN2012103384748A CN102817648A (en) | 2012-09-14 | 2012-09-14 | Residue heat power generating system |
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| CN2012103384748A CN102817648A (en) | 2012-09-14 | 2012-09-14 | Residue heat power generating system |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08233209A (en) * | 1995-02-27 | 1996-09-10 | Mitsubishi Heavy Ind Ltd | Discharged gas temperature adjusting device for boiler |
| CN2689057Y (en) * | 2004-04-07 | 2005-03-30 | 上海宁松热能环境工程有限公司 | Corrosion-proof self-preheating coal savers |
| CN200940825Y (en) * | 2006-08-17 | 2007-08-29 | 中国船舶重工集团公司第七一一研究所 | Wall temperature adjustable heat pipe coal saving device |
| CN201028791Y (en) * | 2007-04-06 | 2008-02-27 | 张志宇 | Anti-corrosion energy-saving boiler flue gas residual heat utilization device |
| CN101696794A (en) * | 2009-11-03 | 2010-04-21 | 上海交通大学 | Smoke waste heat recovery system of power station boiler and method thereof |
| CN102384660A (en) * | 2011-11-08 | 2012-03-21 | 大连易世达新能源发展股份有限公司 | Magnesia calcining rotary kiln flue gas waste heat power generation device |
| CN202883027U (en) * | 2012-09-14 | 2013-04-17 | 凤阳海泰科能源环境管理服务有限公司 | Cogeneration system |
-
2012
- 2012-09-14 CN CN2012103384748A patent/CN102817648A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08233209A (en) * | 1995-02-27 | 1996-09-10 | Mitsubishi Heavy Ind Ltd | Discharged gas temperature adjusting device for boiler |
| CN2689057Y (en) * | 2004-04-07 | 2005-03-30 | 上海宁松热能环境工程有限公司 | Corrosion-proof self-preheating coal savers |
| CN200940825Y (en) * | 2006-08-17 | 2007-08-29 | 中国船舶重工集团公司第七一一研究所 | Wall temperature adjustable heat pipe coal saving device |
| CN201028791Y (en) * | 2007-04-06 | 2008-02-27 | 张志宇 | Anti-corrosion energy-saving boiler flue gas residual heat utilization device |
| CN101696794A (en) * | 2009-11-03 | 2010-04-21 | 上海交通大学 | Smoke waste heat recovery system of power station boiler and method thereof |
| CN102384660A (en) * | 2011-11-08 | 2012-03-21 | 大连易世达新能源发展股份有限公司 | Magnesia calcining rotary kiln flue gas waste heat power generation device |
| CN202883027U (en) * | 2012-09-14 | 2013-04-17 | 凤阳海泰科能源环境管理服务有限公司 | Cogeneration system |
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Application publication date: 20121212 |