CN102288043B - Direct air cooling system for arranging inter-column isolating valve - Google Patents
Direct air cooling system for arranging inter-column isolating valve Download PDFInfo
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- CN102288043B CN102288043B CN201110217843A CN201110217843A CN102288043B CN 102288043 B CN102288043 B CN 102288043B CN 201110217843 A CN201110217843 A CN 201110217843A CN 201110217843 A CN201110217843 A CN 201110217843A CN 102288043 B CN102288043 B CN 102288043B
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Abstract
The invention discloses a direct air cooling system for arranging an inter-column isolating valve, and solves the problem that the conventional system is complexly operated and has high maintenance cost. The system comprises a main exhaust pipeline (1), a steam exhaust branch pipe (2) and a steam distribution pipe (3), wherein the steam distribution pipe (3) is communicated with a condensate water tank (6) through a downstream air cooling condenser (4) and an upstream air cooling condenser (5) in turn; the condensate water tank (6) is provided with a condensate water pipeline (7); the top of the upstream air cooling condenser (5) is provided with a vacuumizing pipeline (8); the steam distribution pipe (3) communicated with the downstream air cooling condenser (4) and the upstream air cooling condenser (5) is provided with an inter-column steam isolating valve (10); and an inter-column vacuumizing pipeline (12) is arranged between the steam distribution pipe (3) which is switched off by the inter-column steam isolating valve (10) and the vacuumizing pipeline (8). The system is simple and reliable, has small initial investment, and solves the problem of freeze.
Description
Technical field
The present invention relates to a kind of thermal power plant heat supply unit exhaust steam in steam turbine direct air cooling system, the method to set up of isolating valve in particularly a kind of direct air cooling system that isolating valve is set and the row thereof in direct air cooling system steam-distributing pipe row.
Background technology
The antifreeze of thermal power plant air cooling system is the problem of people's primary study always, heat supply unit particularly, and winter, the exhaust steam in steam turbine displacement was less, was 1/5～1/6 of normal operating condition.The direct air cooling system that the exhaust steam cooling is adopted; For satisfying the demand of normal operating condition exhaust steam cooling in summer; Confirm the film-cooled heat of the system that disposed in view of the above, and be divided into some row layouts, include following current air cooling tubes condenser and adverse current air cooling tubes condenser in every row by steam channel.But when Winter heat supply moved, the system cools area is far longer than the required actual film-cooled heat of its exhaust steam cooling, and was antifreeze for system, needs to reduce system's area of participating in heat exchange.Conventional way is on the pipeline before getting into each row air cooling tubes condenser the steam isolating door to be set, and turn-offs wherein several row, reduces film-cooled heat according to this; Even but only surplus next column air cooling tubes condenser moves; Severe cold season in the winter time, system cools ability be still greater than the heat-sinking capability of operation needs, causes steam sub-cooled and freezing in the following current air cooling tubes condenser easily; Finally cause unit normally to move, influenced the security and the economy of unit.
Summary of the invention
The invention provides a kind of direct air cooling system that isolating valve in the row is set.When having solved thermal power plant heat supply unit exhaust steam cooling employing direct air cooling system; Because it is less to enter the displacement of air cooling tubes condenser; Even air cooling blower fan all stops; Initiating terminal is provided with the steam-distributing pipe row complete shut-down of isolating valve, and the apparatus cools ability of not establishing the isolating valve row that is produced by natural draft is still greater than its requirement capability, and then causes the freezing technical problem of air cooling tubes condenser.
The present invention overcomes the above problems through following scheme:
A kind of direct air cooling system that steam isolating in the row is set; Comprise the main exhaust pipeline; The blow-off branch that is communicated with the main exhaust pipeline, the steam-distributing pipe that is communicated with blow-off branch, steam-distributing pipe are communicated with condensate tank through following current air cooling tubes condenser and adverse current air cooling tubes condenser successively; Condensate tank is provided with condensate line; Top at the adverse current air cooling tubes condenser is provided with vacuum-pumping pipeline, and the steam-distributing pipe that enters into following current air cooling tubes condenser and adverse current air cooling tubes condenser is provided with the row steam isolating, is provided with vacuum-pumping pipeline in the row between steam-distributing pipe that steam isolating turn-offs in by row and the vacuum-pumping pipeline; Vacuum-pumping pipeline is provided with closes vacuum separation valve, in following current air cooling tubes condenser that steam-distributing pipe is communicated with and adverse current air cooling tubes condenser, is provided with air cooling blower fan in the row.
On described and blow-off branch that the main exhaust pipeline is communicated with, also be provided with many steam-distributing pipes; Every steam-distributing pipe is communicated with condensate tank through following current air cooling tubes condenser and adverse current air cooling tubes condenser successively; Condensate tank is provided with condensate line; Top at the adverse current air cooling tubes condenser is provided with vacuum-pumping pipeline, is provided with steam isolating in the porch of every steam-distributing pipe.
The method to set up of the direct air cooling system of isolating valve in the row is set, may further comprise the steps:
The first step, at first carry out heating power and calculate, calculate according to following formula and get into the heat exhaust Q of direct air cooling system winter;
Q=Dk（Hs－Hc）/1000
Wherein:
The displacement of Dk-maximum in winter heat supply operating mode steam turbine, unit is kg/s
The steam discharge enthalpy of the displacement of Hs-maximum in winter heat supply operating mode steam turbine, unit is kj/kg
The condensate enthalpy of the condensing water temperature of the minimum antifreeze requirement of Hc-, unit are kj/kg;
Second the step, in row the air cooling blower fan full cut-off, it is V=0.5m/s that natural draft causes the condenser face velocity, under this face velocity, can obtain following current condenser Coefficient K 1, counterflow condenser Coefficient K 2;
The 3rd step, according to engineering project typical case year, confirm 2 hours lowest temperature ta that occur winter continuously;
The 4th step, according to whether needs are provided with steam isolating in the row in the following condition judgment row:
If < Q then need not be provided with steam isolating in the row in these row to (K1A1 Δ tm)+(K2A2 Δ tm), and only air cooling blower fan just can satisfy radiating requirements in the need startup row;
(if K1A0 Δ tm)>Q, and (K2A0 Δ tm) Q then need be provided with steam isolating in the row in these row,
In the formula:
The actual area of dissipation of A1-following current condenser, unit are square metre
The actual area of dissipation of A2-counterflow condenser, unit are square metre
A0-following current, counterflow condenser area of dissipation summation A0=A1+A2, unit are square metre
The exhaust steam temperature in the Δ tm-condenser and the logarithmic mean temperature difference (LMTD) of air themperature, unit is ℃;
A1, A2 value are confirmed in the 5th step, adjustment:
At A0 is under the situation of definite value; Constantly increase the actual area of dissipation A2 of counterflow condenser value to A20; Reduce the actual area of dissipation A1 of following current condenser to A10, when (K1A10 Δ tm)+(K2A20 Δ tm)=Q, and satisfy: condensate header water temperature is not less than 35 ℃; When turbine back pressure was not higher than 8kPa, the A10 that confirms this moment, A20 were for being provided with actual area of dissipation of following current condenser and the actual area of dissipation of counterflow condenser behind the steam isolating (10) in row;
A10, A20 value that the 6th step, basis are confirmed; On the steam-distributing pipe that enters into following current air cooling tubes condenser and adverse current air cooling tubes condenser, the row steam isolating is set; Between steam-distributing pipe that steam isolating turn-offs in by row and the vacuum-pumping pipeline vacuum-pumping pipeline in the row is set, on vacuum-pumping pipeline, is provided with and closes vacuum separation valve.
The invention has the beneficial effects as follows: through in the direct air cooling system valve location being arranged on the design variation in the row, transform the ratio of following current in the row, counterflow condenser, changed the method that only is arranged on valve the initiating terminal of row in the traditional method.System of the present invention is simple and reliable, and first small investment has solved antifreeze problem, can reduce the operation back pressure, the fuel saving expense simultaneously.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the structural representation that valve is set in the steam-distributing pipe row of the present invention.
Specific embodiment
A kind of direct air cooling system that isolating valve in the row is set; Comprise main exhaust pipeline 1; The blow-off branch 2 that is communicated with main exhaust pipeline 1; The steam-distributing pipe 3 that is communicated with blow-off branch 2; Steam-distributing pipe 3 is communicated with condensate tank 6 through following current air cooling tubes condenser 4 and adverse current air cooling tubes condenser 5 successively, and condensate tank 6 is provided with condensate line 7, is provided with vacuum-pumping pipeline 8 at the top of adverse current air cooling tubes condenser 5; The steam-distributing pipe 3 that enters into following current air cooling tubes condenser 4 and adverse current air cooling tubes condenser 5 is provided with row steam isolating 10; Be provided with vacuum-pumping pipeline 12 in the row between the steam-distributing pipe 3 that steam isolating 10 turn-offs in by row and the vacuum-pumping pipeline 8, vacuum-pumping pipeline 12 is provided with closes vacuum separation valve 11, in following current air cooling tubes condenser 4 that steam-distributing pipe 3 is communicated with and adverse current air cooling tubes condenser 5, is provided with air cooling blower fan 13 in the row.
On described and blow-off branch 2 that main exhaust pipeline 1 is communicated with, also be provided with many steam-distributing pipes; Every steam-distributing pipe is communicated with condensate tank through following current air cooling tubes condenser and adverse current air cooling tubes condenser successively; Condensate tank is provided with condensate line; Top at the adverse current air cooling tubes condenser is provided with vacuum-pumping pipeline, is provided with steam isolating 9 in the porch of every steam-distributing pipe.
According to satisfying the air cooling tubes condenser scale that summer condition is confirmed; Comprise area of dissipation, steam-distributing pipe columns, following current, counterflow condenser ratio etc.; Heating power through to the Winter heat supply operating mode calculates; Confirm that a certain ad-hoc location is not installed isolating valve in the row in the middle of establishing some row of steam isolating; That is: under the condition that total area of dissipation is constant in row, reduce the strong following current condenser area of cooling capacity, change into the less counterflow condenser area of cooling capacity through valve, vacuum lead is connected with vacuum lead and establishes vacuum separation valve in the row of the counterflow condenser after the conversion.During winter operation, close isolating valve in the row, open vacuum separation valve and get final product, get into non-heat supply during the phase, open isolating valve in the row, close vacuum separation valve, return to original state.
Row in the described direct air cooling system are meant a refrigerating function group that on a steam distribution pipe, is connected with following current condenser, counterflow condenser formation.Isolating valve is an electric butterfly valve in the described row, and vacuum separation valve is an electrical ball valve, and both duties are vacuum.
The method to set up of the direct air cooling system of isolating valve in the row is set, may further comprise the steps:
The first step, at first carry out heating power and calculate, calculate according to following formula and get into the heat exhaust Q of direct air cooling system winter;
Q=Dk（Hs－Hc）/1000
Wherein:
The displacement of Dk-maximum in winter heat supply operating mode steam turbine, unit is kg/s
The steam discharge enthalpy of the displacement of Hs-maximum in winter heat supply operating mode steam turbine, unit is kj/kg
The condensate enthalpy of the condensing water temperature of the minimum antifreeze requirement of Hc-, unit are kj/kg;
Second the step, in row air cooling blower fan 13 full cut-ofves, it is V=0.5m/s that natural draft causes the condenser face velocity, under this face velocity, can obtain following current condenser Coefficient K 1, counterflow condenser Coefficient K 2;
The 3rd step, according to engineering project typical case year, confirm 2 hours lowest temperature ta that occur winter continuously;
The 4th step, according to whether needs are provided with steam isolating 10 in the row in the following condition judgment row:
If < Q then need not be provided with steam isolating 10 in the row to (K1A1 Δ tm)+(K2A2 Δ tm) in these row, only air cooling blower fan 13 just can satisfy radiating requirements in the need startup row;
(if K1A0 Δ tm)>Q, and (K2A0 Δ tm) Q then need be provided with steam isolating 10 in the row in these row,
In the formula:
The actual area of dissipation of A1-following current condenser, unit are square metre
The actual area of dissipation of A2-counterflow condenser, unit are square metre
A0-following current, counterflow condenser area of dissipation summation A0=A1+A2, unit are square metre
The exhaust steam temperature in the Δ tm-condenser and the logarithmic mean temperature difference (LMTD) of air themperature, unit is ℃;
A1, A2 value are confirmed in the 5th step, adjustment:
At A0 is under the situation of definite value; Constantly increase the actual area of dissipation A2 of counterflow condenser value to A20; Reduce the actual area of dissipation A1 of following current condenser to A10, when (K1A10 Δ tm)+(K2A20 Δ tm)=Q, and satisfy: condensate header water temperature is not less than 35 ℃; When turbine back pressure was not higher than 8kPa, the A10 that confirms this moment, A20 were for being provided with actual area of dissipation of following current condenser and the actual area of dissipation of counterflow condenser behind the steam isolating 10 in row;
A10, A20 value that the 6th step, basis are confirmed; On the steam-distributing pipe 3 that enters into following current air cooling tubes condenser 4 and adverse current air cooling tubes condenser 5, row steam isolating 10 is set; Between steam-distributing pipe 3 that steam isolating 10 turn-offs in by row and the vacuum-pumping pipeline 8 vacuum-pumping pipeline 12 in the row is set, on vacuum-pumping pipeline 12, is provided with and closes vacuum separation valve 11.
Claims (2)
1. direct air cooling system that steam isolating in the row is set; Comprise main exhaust pipeline (1); The blow-off branch (2) that is communicated with main exhaust pipeline (1); The steam-distributing pipe (3) that is communicated with blow-off branch (2); Steam-distributing pipe (3) is communicated with condensate tank (6) through following current air cooling tubes condenser (4) and adverse current air cooling tubes condenser (5) successively; Condensate tank (6) is provided with condensate line (7), is provided with vacuum-pumping pipeline (8) at the top of adverse current air cooling tubes condenser (5), it is characterized in that; The steam-distributing pipe (3) that enters into following current air cooling tubes condenser (4) and adverse current air cooling tubes condenser (5) is provided with row steam isolating (10); Under the constant condition of total area of dissipation of following current air cooling tubes condenser and adverse current air cooling tubes condenser, reduce the strong following current air cooling tubes condenser area of cooling capacity, change into the less adverse current air cooling tubes condenser area of cooling capacity through steam isolating in these row, be provided with vacuum-pumping pipeline in the row (12) between steam-distributing pipe (3) that steam isolating (10) turn-offs in by row and the vacuum-pumping pipeline (8); Vacuum-pumping pipeline in the row (12) is provided with closes vacuum separation valve (11), in following current air cooling tubes condenser (4) that steam-distributing pipe (3) is communicated with and adverse current air cooling tubes condenser (5), is provided with air cooling blower fan in the row (13).
2. a kind of direct air cooling system that steam isolating in the row is set according to claim 1; It is characterized in that; On described and blow-off branch (2) that main exhaust pipeline (1) is communicated with, also be provided with many steam-distributing pipes; Every steam-distributing pipe of said many steam-distributing pipes is communicated with condensate tank through following current air cooling tubes condenser and adverse current air cooling tubes condenser successively; Condensate tank is provided with condensate line, is provided with vacuum-pumping pipeline at the top of adverse current air cooling tubes condenser, is provided with steam isolating (9) in the porch of every steam-distributing pipe of said many steam-distributing pipes.
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| CN201110217843A CN102288043B (en) | 2011-08-01 | 2011-08-01 | Direct air cooling system for arranging inter-column isolating valve |
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| CN201110217843A CN102288043B (en) | 2011-08-01 | 2011-08-01 | Direct air cooling system for arranging inter-column isolating valve |
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| CN102288043B true CN102288043B (en) | 2012-10-10 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106323032B (en) * | 2015-06-18 | 2018-08-28 | 新特能源股份有限公司 | A kind of Air-Cooling Island header tank antifreeze control system |
| CN107062936B (en) * | 2017-04-01 | 2019-07-19 | 廖原 | The control method of direct air cooling system |
| CN113804014B (en) * | 2021-10-15 | 2023-08-11 | 国能龙源蓝天节能技术有限公司上海分公司 | Power plant air cooling island capacity-increasing switching system |
| CN114458397B (en) * | 2022-01-05 | 2023-12-26 | 国网河北省电力有限公司电力科学研究院 | Method for strengthening winter starting performance of small-machine direct-discharge air cooling unit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3685579A (en) * | 1969-08-08 | 1972-08-22 | Balcke Maschbau Ag | Cooling tower system |
| CN101526313A (en) * | 2009-01-08 | 2009-09-09 | 江苏双良空调设备股份有限公司 | Freeze-prevention direct air cooling condenser |
| CN201497387U (en) * | 2009-05-08 | 2010-06-02 | 北京布鲁斯盖环保科技发展有限公司 | Direct air cooling system for combined ventilation of heat power plant |
| CN101852105A (en) * | 2010-05-25 | 2010-10-06 | 山西省电力勘测设计院 | Steam exhaust direct-discharge system of feed pump turbine of direct air-cooling unit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009012323A2 (en) * | 2007-07-16 | 2009-01-22 | Earth To Air Systems, Llc | Direct exchange heating/cooling system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3685579A (en) * | 1969-08-08 | 1972-08-22 | Balcke Maschbau Ag | Cooling tower system |
| CN101526313A (en) * | 2009-01-08 | 2009-09-09 | 江苏双良空调设备股份有限公司 | Freeze-prevention direct air cooling condenser |
| CN201497387U (en) * | 2009-05-08 | 2010-06-02 | 北京布鲁斯盖环保科技发展有限公司 | Direct air cooling system for combined ventilation of heat power plant |
| CN101852105A (en) * | 2010-05-25 | 2010-10-06 | 山西省电力勘测设计院 | Steam exhaust direct-discharge system of feed pump turbine of direct air-cooling unit |
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