CN2779074Y - Modified contranatant steam condensation device of direct air cooling units - Google Patents
Modified contranatant steam condensation device of direct air cooling units Download PDFInfo
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- CN2779074Y CN2779074Y CN 200520095269 CN200520095269U CN2779074Y CN 2779074 Y CN2779074 Y CN 2779074Y CN 200520095269 CN200520095269 CN 200520095269 CN 200520095269 U CN200520095269 U CN 200520095269U CN 2779074 Y CN2779074 Y CN 2779074Y
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- condenser
- vacuum pump
- direct air
- pump
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Abstract
The utility model relates to an improved counter-flow steam condensing device of a direct air cooling machine set. The utility model comprises a low-pressure cylinder (1) of a steam turbine, a steam discharging device (2), a forward-flow steam condenser (4), a counter-flow steam condenser (5), a condensed water collection box (6), a vacuum pump (8) and a steam extracting pipeline ball valve (11), wherein the low-pressure cylinder (1) of the steam turbine is positioned on the steam discharging device (2) which is connected with the forward-flow steam condenser (4) through a steam discharging pipe (3), the condensed water collection box (6) is respectively connected with the forward-flow steam condenser (4) and the counter-flow steam condenser (5) through pipelines, the condensed water collection box (6) is connected with a condensed water pump (7) through the pipeline, and the vacuum pump (8) is connected with the counter-flow steam condenser (5) through the pipeline. The utility model which decreases the resistance of a steam extracting system can solve the problems that the operating back pressure of a steam machine is suppressed to rise and the counter-flow steam condenser is frozen in winter existing in the prior art.
Description
Technical field
The utility model technology relates to a kind of condensing system of Direct Air-cooled Unit, and specifically it is a kind of Direct Air-cooled Unit modified model adverse current condensing plant, and it is a kind of no steam trap valve, do not have the core pipe adverse current condensing plant of bleeding.
Background technique
The direct air cooling condensing plant is one of important device of Direct Air-cooled Unit, and it mainly forms (see figure 1) by equipment such as steam exhaust device, following current vapour condenser, counterflow condenser, water of condensation collecting box, condensate pump, vacuum pump, steam trap valve and pipeline.Compare with clammy unit, the volume of vapour condenser is very big, and certainly the vacuum system volume is big, and is also big from the bleed air quantity of vacuum system of environment.These leaked-in airs will be extracted out from the counterflow condenser upper end in time, in order to reduce bleed steam flow of taking away and the burden that alleviates vacuum pump, on the exhaust tube of counterflow condenser upper end, be provided with steam trap valve, with the through-current capacity of restriction exhaust tube and the steam turbine steam discharge is condensed in following current vapour condenser and counterflow condenser, particularly in counterflow condenser, make the steam turbine steam discharge that does not also condense obtain fair segregation junction.
During unit operation, steam turbine back pressure (equal condenser pressure and add the blow-off line pressure drop) should reduce along with the reduction of ambient air temperature in theory, and can drop to the obstruction back pressure of steam turbine, to improve the heat-economy of unit.In fact, when ambient air temperature is lower than 1～2 ℃, the upper end of counterflow condenser (end of bleeding) metal temperature is lower than 0 ℃, the freezing tube bank for the water freezing that prevents vapor condenses, the steam trap valve of need adjusting again guarantees that with the operation back pressure that improves steam turbine the metal temperature of counterflow condenser upper end is not less than-1 ℃～-2 ℃.The operation back pressure of steam turbine can and be blocked the back pressure height much than the design back pressure like this, makes the heat consumption rate of steam turbine increase a lot.As: the design back pressure of certain 300MW of power plant Direct Air-cooled Unit is 15kPa, and blocking back pressure is 6.15kPa, and in December, 2004, the actual motion back pressure of No. 1 steam turbine on the 1st was 22kPa, and its main cause is that air has been assembled in the inside, upper end of counterflow condenser.
In the direct air cooling condensing system, when ambient air temperature is lower than 1～2 ℃, if reduce the back pressure of steam turbine, though increase few from the bleed air quality of vacuum system of environment, but the pressure of volume of air and counterflow condenser is inversely proportional to owing to bleed, and the air of the pump-line of need flowing through carries steam with it volume flow will increase more.Like this, the metering function of steam trap valve increases, the pump-line pressure drop increases, the air of the vacuum system of bleeding can not in time be discharged, and accumulate in the upper end of counterflow condenser, make the interior steam of tube bank epimere heating tube nest preferably, when the cool air in the tube bank outside was lower than 0 ℃, the metal temperature of counterflow condenser upper end can be lower than 0 ℃.Accumulate in the air of counterflow condenser upper end, though the internal surface in tube bank has formed the air film that hinders heat transfer, but the water vapor that relies on diffusion motion to arrive the tube bank inner metal surface will condense and freeze, through the easy freezing counterflow condenser of ice sheet thickening after a while.Existing Direct Air-cooled Unit adopts high back pressure operation method to improve the vapor (steam) temperature of vapour condenser vapour side, has correspondingly improved counterflow condenser upper end gas vapour mixture temperature, though can reach antifreeze purpose.But this method has increased the hear rate of unit, is not a method preferably.
Summary of the invention
The purpose of this utility model is to overcome the deficiency of above-mentioned existing adverse current condensing plant, and a kind of Direct Air-cooled Unit modified model adverse current condensing plant is provided.The utility model can reduce the extract system resistance, and purpose is to solve above-mentioned existing background technique steam turbine in existing winter operation back pressure to suppress liter and counterflow condenser frozen problem.
The purpose of this utility model reaches by following measure: Direct Air-cooled Unit modified model adverse current condensing plant, it is characterized in that it comprises turbine low pressure cylinder 1, steam exhaust device 2, following current vapour condenser 4, counterflow condenser 5, water of condensation collecting box 6, vacuum pump 8, pump-line ball valve 11, described turbine low pressure cylinder 1 is positioned on the steam exhaust device 2, steam exhaust device 2 is connected with following current vapour condenser 4 by exhaust steam pipe 3, water of condensation collecting box 6 connects following current vapour condenser 4 and counterflow condenser 5 respectively by pipeline, described water of condensation collecting box 6 is connected with condensate pump 7 by pipeline, vacuum pump 8 connects counterflow condenser 5 by pipeline, and described counterflow condenser 5 tops are mono-layer tube.
In technique scheme, described vacuum pump 8 is the frequency control of motor speed vacuum pump.
In technique scheme, between described counterflow condenser 5 and the vacuum pump 8 pump-line ball valve 11 is arranged.
The utility model Direct Air-cooled Unit modified model adverse current condensing plant has following advantage: 1) do not establish steam trap valve on pump-line, can reduce the extract system resistance, and solution steam turbine in winter operation back pressure is suppressed liter and counterflow condenser frozen problem; 2) adopt the frequency control of motor speed vacuum pump, the running speed of vacuum pump is low, both can reduce power consumption, can prolong the working life of vacuum pump again; 3) the core pipe of bleeding (being that the counterflow condenser top is a mono-layer tube) of cancellation counterflow condenser inside, the perforate of the core pipe of bleeding in the time of can preventing the cold start of machine unit in winter is frozen and is stopped up, and can discharge the air (incondensable gas) in the counterflow condenser in time; 4) after establishing ball valve on the pump-line, on each arm of steam turbine steam discharge, can not establish major diameter, vacuum shutoff butterfly valve, can dwindle the leakage detection scope to increase work efficiency when checking gas leakage, can be used for the bleed band vapour amount of the fine setting of each counterflow condenser with balanced each counterflow condenser.
Description of drawings
Fig. 1 is the structural representation of existing Direct Air-cooled Unit adverse current condensing plant;
Fig. 2 is the structural representation of the utility model Direct Air-cooled Unit modified model adverse current condensing plant.
Embodiment
Below in conjunction with the performance of accompanying drawing detailed description the utility model Direct Air-cooled Unit modified model adverse current condensing plant, but they do not constitute restriction of the present utility model.
From accompanying drawing as can be known: Direct Air-cooled Unit modified model adverse current condensing plant, it comprises turbine low pressure cylinder 1, steam exhaust device 2, following current vapour condenser 4, counterflow condenser 5, water of condensation collecting box 6, vacuum pump 8, pump-line ball valve 11, described turbine low pressure cylinder 1 is positioned on the steam exhaust device 2, steam exhaust device 2 is connected with following current vapour condenser 4 by exhaust steam pipe 3, water of condensation collecting box 6 connects following current vapour condenser 4 and counterflow condenser 5 respectively by pipeline, described water of condensation collecting box 6 is connected with condensate pump 7 by pipeline, vacuum pump 8 connects counterflow condenser 5 by pipeline, and described counterflow condenser 5 tops are mono-layer tube.Described vacuum pump 8 is the frequency control of motor speed vacuum pump.Between described counterflow condenser 5 and the vacuum pump 8 pump-line ball valve 11 is arranged.
The utility model obtains gratifying effect on probation on certain 300MW of power plant Direct Air-cooled Unit: the steam trap valve of dismantling, strengthen the caliber of bleeding before steam turbine operation back pressure be 22kPa (data at the beginning of 2004 12 months), steam turbine operation back pressure drops to 12-13kPa (data at the beginning of 2005 1 month) after caliber is bled in the steam trap valve of dismantling, increasing, the vacuum problem of unit is resolved, and has improved the heat-economy of unit.
Claims (3)
1, Direct Air-cooled Unit modified model adverse current condensing plant, it is characterized in that it comprises turbine low pressure cylinder (1), steam exhaust device (2), following current vapour condenser (4), counterflow condenser (5), water of condensation collecting box (6), vacuum pump (8), pump-line ball valve (11), described turbine low pressure cylinder (1) is positioned on the steam exhaust device (2), steam exhaust device (2) is connected with following current vapour condenser (4) by exhaust steam pipe (3), water of condensation collecting box (6) connects following current vapour condenser (4) and counterflow condenser (5) respectively by pipeline, described water of condensation collecting box (6) is connected with condensate pump (7) by pipeline, vacuum pump (8) connects counterflow condenser (5) by pipeline, and described counterflow condenser (5) top is a mono-layer tube.
2, Direct Air-cooled Unit modified model adverse current condensing plant according to claim 1 is characterized in that described vacuum pump (8) is the frequency control of motor speed vacuum pump.
3, Direct Air-cooled Unit modified model adverse current condensing plant according to claim 1 and 2 is characterized in that between described counterflow condenser (5) and vacuum pump (8) pump-line ball valve (11) being arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520095269 CN2779074Y (en) | 2005-02-18 | 2005-02-18 | Modified contranatant steam condensation device of direct air cooling units |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520095269 CN2779074Y (en) | 2005-02-18 | 2005-02-18 | Modified contranatant steam condensation device of direct air cooling units |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2779074Y true CN2779074Y (en) | 2006-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520095269 Expired - Lifetime CN2779074Y (en) | 2005-02-18 | 2005-02-18 | Modified contranatant steam condensation device of direct air cooling units |
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| Country | Link |
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| CN (1) | CN2779074Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103644002A (en) * | 2013-11-29 | 2014-03-19 | 广西博宣食品有限公司 | Steam extraction cooling system of turbine steam seal for sugar factory |
| CN110374699A (en) * | 2019-06-12 | 2019-10-25 | 唐山首钢京唐西山焦化有限责任公司 | Steam turbine vacuum pipe drainage arrangement and water discharge method |
-
2005
- 2005-02-18 CN CN 200520095269 patent/CN2779074Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103644002A (en) * | 2013-11-29 | 2014-03-19 | 广西博宣食品有限公司 | Steam extraction cooling system of turbine steam seal for sugar factory |
| CN110374699A (en) * | 2019-06-12 | 2019-10-25 | 唐山首钢京唐西山焦化有限责任公司 | Steam turbine vacuum pipe drainage arrangement and water discharge method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20150218 Granted publication date: 20060510 |