CN103628939A - Method for improving waste-heat utilization of steam turbine unit - Google Patents
Method for improving waste-heat utilization of steam turbine unit Download PDFInfo
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- CN103628939A CN103628939A CN201310621111.XA CN201310621111A CN103628939A CN 103628939 A CN103628939 A CN 103628939A CN 201310621111 A CN201310621111 A CN 201310621111A CN 103628939 A CN103628939 A CN 103628939A
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Abstract
The invention discloses a method for improving waste-heat utilization of a steam turbine unit. The method is based on a direct air cooling unit and a wet cooling unit which are concomitant in a power station, a heat exchanger is additionally arranged in a steam exhaust device of the direct air cooling unit, fed water of the wet cooling unit is led to the heat exchanger arranged in the steam exhaust device of the direct air cooling unit to conduct circulation flowing, and high-temperature steam in the steam exhaust device of the direct air cooling unit is used for heating the fed water of the wet cooling unit. The method is reasonable and effective, waste heat of the direct air cooling unit is reliably used, the energy consumption of the direct air cooling unit and the wet cooling unit is reduced, the output of the wet cooling unit is improved, the power generation cost of the power station is greatly reduced, energy conservation and environment protection are achieved, the earnings are greatly and reliably improved.
Description
Technical field
The present invention relates to the operation method of steam turbine set, specifically a kind of method that improves steam turbine set UTILIZATION OF VESIDUAL HEAT IN.
Background technique
At present, about the measure that utilizes of the weary heat of steam turbine set cold junction steam discharge, be mainly Heating Period heat supply network heating, with this, reduce the loss of the weary heat of steam turbine set cold junction steam discharge, improve power plant thermal efficiency.Yet, the existence of the weary heat utilization of this steam turbine set based on heat demand realizes, if the pure electric turbine group without heat demand, demand object and the weary heat of cold junction of steam turbine set can not be utilized for want of, cause the cold junction exhaust steam of steam turbine set to be wasted, the thermal efficiency of power plant is low, has increased cost of electricity-generating.
Direct Air-cooled Unit and clammy unit belong to the above-mentioned pure electric turbine group without heat demand.So-called Direct Air-cooled Unit refers to that the steam discharge of steam turbine set directly carrys out condensation with air, between air and steam, carry out heat exchange, its technological process is: steam turbine set cold junction steam discharge drains in outdoor air cooling condenser by steam exhaust device (being generally Large Diameter Pipeline blow-off line), axial flow cooling blower makes air flow through the outer surface of air cooling condenser, steam discharge is condensed into water, and water of condensation is sent boiler by pumping back to after the heating such as final stage low-pressure heater.So-called clammy unit refers to that the steam discharge of steam turbine set carries out condensation by the cooling water circulating, its technological process is: steam turbine set cold junction steam discharge causes clammy tower, recirculated cooling water spray on clammy tower and under, with the steam generation heat exchange that makes progress mobile until condense into water, in water of condensation, contain a large amount of recirculated cooling waters, temperature is very low, and water of condensation is sent boiler by pumping back to after the heating such as final stage low-pressure heater.
Technological process by Direct Air-cooled Unit can clearly be found out: the vapor (steam) temperature that drains into air cooling condenser through steam exhaust device is very high, the heat load of air cooling condenser is high, steam condensation efficiency is low, need to strengthen the mechanical efficiency of axial flow cooling blower, with this, increase air flow amount and carry out cooling air cooling condenser, this not only makes a large amount of waste heats without utilizing of steam turbine set cold junction steam discharge, directly enter in atmosphere, cause waste and atmosphere is caused to serious thermo-pollution, be unfavorable for energy-conserving and environment-protective, and the acting of the high efficiency of axial flow cooling blower certainly will cause the power consumption of power plant significantly to increase, increased operating cost.Technological process by clammy unit can clearly be found out: the feed temperature forming after clammy tower condenses is very low, need to increase to draw gas and at final stage low-pressure heater place, feedwater is heated, feedwater after heating is sent into high-pressure heater again and is heated, this not only makes the high-quality steam of clammy unit cause waste, reduced exerting oneself of clammy unit, and increased the energy consumption of clammy unit, operating cost is significantly increased.
In sum, in view of Direct Air-cooled Unit and clammy unit belong to the pure electric turbine group without heat demand, in prior art, also there is not the technology to the weary heat utilization of its cold junction steam discharge, their the weary heat of cold junction steam discharge can not be utilized, continue waste, the thermal efficiency of power plant is low, and cost of electricity-generating is high.
Summary of the invention
The object of the invention is to: the roadability separately of the Direct Air-cooled Unit coexisting for above-mentioned power station and clammy unit, a kind of method that can effectively improve steam turbine set UTILIZATION OF VESIDUAL HEAT IN is provided, the method utilizes the high-temperature steam in Direct Air-cooled Unit steam exhaust device to heat the feedwater of clammy unit, waste heat without the pure electric turbine group of heat demand is obtained rationally, effectively, utilize reliably, reduce energy consumption, increase is exerted oneself, and significantly reduces cost of electricity-generating.
The technical solution used in the present invention is: a kind of method that improves steam turbine set UTILIZATION OF VESIDUAL HEAT IN, Direct Air-cooled Unit and the clammy unit of described method based on coexisting in power station, in the steam exhaust device of Direct Air-cooled Unit, have additional heat exchanger, the feedwater of clammy unit is caused on the heat exchanger arranging in Direct Air-cooled Unit steam exhaust device and circulated, the feedwater that utilizes the high-temperature steam in Direct Air-cooled Unit steam exhaust device to heat clammy unit.
Further, described heat exchanger is the surface-type heat exchanger that heat exchanging tube is made.
Further, described feedwater is that the supply pipe from clammy unit gland heater is drawn, on this supply pipe, draw and have feedwater heat exchange intake pipe and feedwater heat exchange return pipe, the heat exchanger that feedwater heat exchange intake pipe and feedwater heat exchange return pipe arrange in Direct Air-cooled Unit steam exhaust device forms feed water circuit on supply pipe.
Further, the supply pipe between described feedwater heat exchange intake pipe and feedwater heat exchange return pipe is provided with valve.
Further, on described feedwater heat exchange intake pipe and feedwater heat exchange return pipe, be respectively equipped with valve.
The invention has the beneficial effects as follows, in the power station that Direct Air-cooled Unit and clammy unit coexist, utilize this characteristic that Direct Air-cooled Unit is higher than clammy unit exhaust pressure (saturation temperature is poor is about 15～25 ℃), in the steam exhaust device of Direct Air-cooled Unit, set up heat exchanger, the feedwater of clammy unit is caused on aforementioned heat exchanger and circulated, the feedwater that utilizes the high-temperature steam in Direct Air-cooled Unit steam exhaust device to heat clammy unit, the advantage of this measure is:
For Direct Air-cooled Unit, heat exchange is carried out in the clammy unit feedwater circulating in high-temperature steam in steam exhaust device and heater, in steam exhaust device the weary heat of steam turbine set cold junction steam discharge by rationally, effectively, utilize reliably, avoided thermal waste, the vapor (steam) temperature that enters air cooling condenser is relatively very low, the heat load of air cooling condenser decreases, the condensation efficiency of steam significantly improves, the mechanical efficiency of axial flow cooling blower is required to also corresponding reduction thereupon, significantly reduce the power consumption of power plant, effectively reduced the cost of electricity-generating of power station; And after the steam that temperature is relatively very low and air heat-exchange condense, the heat entering in atmosphere is very little, has alleviated thermo-pollution, energy-conserving and environment-protective;
For clammy unit, high-temperature steam in Direct Air-cooled Unit steam exhaust device has carried out heating (feedwater heat absorption heats up approximately 10～15 ℃) to the low temperature feedwater of clammy unit, thereby reduced the drawing gas to feedwater heating at final stage low-pressure heater place, effectively reduce the high-quality steam waste of clammy unit, increased exerting oneself of clammy unit, promoted generated energy, significantly reduced the energy consumption of clammy unit, the operating cost of clammy unit is significantly reduced;
Described in before combining, the present invention has utilized the waste heat of Direct Air-cooled Unit rationally, effectively, reliably, has reduced the energy consumption of Direct Air-cooled Unit and clammy unit, increased exerting oneself of clammy unit, significantly reduced the cost of electricity-generating of power station, energy-conserving and environment-protective, income significantly and reliably improves.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Fig. 1 is a kind of theory diagram of the present invention.
Code name implication in figure: 1-Direct Air-cooled Unit; 2-clammy unit; 3-high back pressure steam exhaust device; 4-low back pressure vapour condenser; 5-air cooling condenser; 6-heat exchanger; 7-supply pipe; 8-feedwater heat exchange intake pipe; 9-feedwater heat exchange return pipe; V1, v2, v3-valve.
Embodiment
?referring to Fig. 1: the present invention is Direct Air-cooled Unit 1 based on coexisting in power station and clammy unit 2 and realize.At the high back pressure steam exhaust device 3(that does not affect Direct Air-cooled Unit 1, be generally Large Diameter Pipeline blow-off line) under the prerequisite of sealability, in the high back pressure steam exhaust device 3 of Direct Air-cooled Unit 1, have additional heat exchanger 6, the feedwater of clammy unit 2 is caused on the heat exchanger 6 of high back pressure steam exhaust device 3 interior settings of Direct Air-cooled Unit 1 and circulate, the feedwater that utilizes the high-temperature steam in the high back pressure steam exhaust device 3 of Direct Air-cooled Unit 1 to heat clammy unit 2, concrete measure is as follows.
The high back pressure steam exhaust device 3 of Direct Air-cooled Unit 1 drains into steam turbine set cold junction steam discharge in air cooling condenser 5 and condenses, and the steam turbine set cold junction steam discharge in high back pressure steam exhaust device 3 is high-temperature steam comparatively speaking so, has very high value.In order to utilize it, do not affecting under the prerequisite of high back pressure steam exhaust device 3 sealabilities, in high back pressure steam exhaust device 3, set up the surface-type heat exchanger that a heat exchanging tube is made, its shape there is no particular requirement, as long as it can meet wall shunting, heat exchange.
It is clammy tower that the feedwater of clammy unit 2 is mainly by low back pressure vapour condenser 4() water of condensation (being mixed with cooling water) of condensing and obtaining.The feedwater that clammy unit 2 enters the heat exchanger 9 of Direct Air-cooled Unit 1 high back pressure steam exhaust device 3 interior settings is that supply pipe 7 is drawn from the gland heater of clammy unit 2, on this supply pipe 7, draw successively and have feedwater heat exchange intake pipe 8 and feedwater heat exchange return pipe 9, feedwater heat exchange intake pipe 8 and feedwater heat exchange return pipe 9 are connected on the heat exchanger 6 of high back pressure steam exhaust device 3 interior settings, heat exchanger 6 through the 3 interior settings of high back pressure steam exhaust device forms feed water circuit on supply pipe 7, be that the feedwater of low temperature in clammy unit 2 supply pipes 7 enters in the heat exchanger 6 of high back pressure steam exhaust device 3 interior settings through feedwater heat exchange intake pipe 8, carry out heat exchange with Direct Air-cooled Unit 1 cold junction steam discharge, after being heated, by feedwater heat exchange return pipe 9, enter supply pipe 7, and heat by the supply pipe 7 final stage low-pressure heater of flowing through.In order to ensure from supply pipe 7 upstreams, the feedwater of low temperature out can all enter in the heat exchanger 6 of high back pressure steam exhaust device 3 interior settings, on the supply pipe 7 between feedwater heat exchange intake pipe 8 and feedwater heat exchange return pipe 9, be provided with valve v1, also in order to control, enter the interior flow of high back pressure steam exhaust device 3 and from getting back to the flow of supply pipe 7 in high back pressure steam exhaust device 3, on feedwater heat exchange intake pipe 8 and feedwater heat exchange return pipe 9, be respectively equipped with valve, i.e. valve v2, v3.
Running of the present invention is: the runnability of collecting Direct Air-cooled Unit 1 and clammy unit 2, analyze the data such as back pressure, load, exhaust steam flow (realizing based on existing routine techniques), the heat exchange of determining between Direct Air-cooled Unit 1 and clammy unit 2 according to these runnabilitys regulates operating mode.
Open the feedwater heat exchange intake pipe 8 of clammy unit 2 and the valve on feedwater heat exchange return pipe 9, be valve v2 and valve v3, and close the valve on supply pipe 7 between feedwater heat exchange intake pipe 8 and feedwater heat exchange return pipe 9, be valve v1, make unit commitment operation, the feedwater of clammy unit 2 is heated by the high-temperature steam in Direct Air-cooled Unit 1 high back pressure steam exhaust device 3 by feed water circuit, after the feedwater heat temperature raising of clammy unit 2, the final stage low-pressure heater that flows back to clammy unit 2 heats, the vapor (steam) temperature that high back pressure steam exhaust device 3 drains into air cooling condenser 5 is simultaneously reduced by heat exchange.
After Direct Air-cooled Unit 1 is shut down, the valve v1 on clammy unit 2 supply pipes 7 of standard-sized sheet, closes the valve v2 on feedwater heat exchange intake pipe 8 and the valve v3 feeding water on heat exchange return pipe 9, and clammy unit 2 operations are restored.
After clammy unit 2 is shut down, without any operation, Direct Air-cooled Unit 1 operation is restored.
Claims (5)
1. a method that improves steam turbine set UTILIZATION OF VESIDUAL HEAT IN, it is characterized in that: Direct Air-cooled Unit and the clammy unit of described method based on coexisting in power station, in the steam exhaust device of Direct Air-cooled Unit, have additional heat exchanger, the feedwater of clammy unit is caused on the heat exchanger arranging in Direct Air-cooled Unit steam exhaust device and circulated, the feedwater that utilizes the high-temperature steam in Direct Air-cooled Unit steam exhaust device to heat clammy unit.
2. improve according to claim 1 the method for steam turbine set UTILIZATION OF VESIDUAL HEAT IN, it is characterized in that: described heat exchanger is the surface-type heat exchanger that heat exchanging tube is made.
3. improve according to claim 1 the method for steam turbine set UTILIZATION OF VESIDUAL HEAT IN, it is characterized in that: described feedwater is that the supply pipe from clammy unit gland heater is drawn, on this supply pipe, draw and have feedwater heat exchange intake pipe and feedwater heat exchange return pipe, the heat exchanger that feedwater heat exchange intake pipe and feedwater heat exchange return pipe arrange in Direct Air-cooled Unit steam exhaust device forms feed water circuit on supply pipe.
4. improve according to claim 3 the method for steam turbine set UTILIZATION OF VESIDUAL HEAT IN, it is characterized in that: the supply pipe between described feedwater heat exchange intake pipe and feedwater heat exchange return pipe is provided with valve.
5. according to the method that improves steam turbine set UTILIZATION OF VESIDUAL HEAT IN described in claim 3 or 4, it is characterized in that: on described feedwater heat exchange intake pipe and feedwater heat exchange return pipe, be respectively equipped with valve.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106500518A (en) * | 2016-10-26 | 2017-03-15 | 东方电气集团东方汽轮机有限公司 | A kind of Direct Air-cooled Unit steam exhaust device |
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| CN202348352U (en) * | 2011-08-17 | 2012-07-25 | 王玉山 | Cooling system in thermal power plant |
| CN203146044U (en) * | 2013-03-12 | 2013-08-21 | 太原市宇腾达科技有限公司 | Dead steam heat recycle equipment of air cooling turbine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5246340Y2 (en) * | 1973-07-03 | 1977-10-21 | ||
| CN1159509A (en) * | 1995-09-22 | 1997-09-17 | 亚瑞亚·勃朗勃威力有限公司 | Operation method for equipment of electric power station |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106500518A (en) * | 2016-10-26 | 2017-03-15 | 东方电气集团东方汽轮机有限公司 | A kind of Direct Air-cooled Unit steam exhaust device |
| CN106500518B (en) * | 2016-10-26 | 2019-05-17 | 东方电气集团东方汽轮机有限公司 | A kind of Direct Air-cooled Unit steam exhaust device |
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