CN114812214A - Direct air cooling system transformation method for enabling air cooling condenser to have energy-saving and life-prolonging effects - Google Patents
Direct air cooling system transformation method for enabling air cooling condenser to have energy-saving and life-prolonging effects Download PDFInfo
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- CN114812214A CN114812214A CN202210719880.2A CN202210719880A CN114812214A CN 114812214 A CN114812214 A CN 114812214A CN 202210719880 A CN202210719880 A CN 202210719880A CN 114812214 A CN114812214 A CN 114812214A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
- F28B1/06—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using air or other gas as the cooling medium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
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Abstract
The invention discloses a direct air cooling system transformation method which enables an air cooling condenser to have energy-saving and life-prolonging effects, prolongs the service life of an early-stage operated direct air cooling unit, and improves the heat economy of the operated unit; the method belongs to the field of direct air cooling systems, and is characterized in that an original large A-shaped air cooling condenser with three rows of tubes or two rows of tubes is removed, and double small A-shaped air cooling condensers which are arranged side by side are manufactured according to the size of the space occupied by the original large A-shaped air cooling condenser with three rows of tubes or two rows of tubes, are in a self-supporting structural form, and do not need to be provided with a steel A-shaped bracket; the fan set is changed into low-position arrangement, high-position horizontal sections of two main steam exhaust pipelines of the direct air cooling system are communicated together to replace a communicating pipe between vertical sections of the traditional steam exhaust pipelines, the top elevation of the horizontal steam exhaust pipelines is improved to be basically parallel to a cantilever beam on a steel truss, and the length of the vertical sections of the steam exhaust branch pipes is reduced; the reconstruction time is shorter, and the additional occupied field is not needed.
Description
Technical Field
The invention relates to a direct air cooling system, in particular to a method for modifying and replacing an air cooling condenser body and a fan unit of an early-stage operated direct air cooling unit so as to prolong the service life of the direct air cooling system and enable the direct air cooling system to have an energy-saving effect.
Background
The direct air cooling system is an important component of a turbonator in a thermal power plant, and the operating state of the system directly influences the power generation capacity of a steam turbine and the heat efficiency of the power plant, so that the heat transfer efficiency of the direct air cooling condenser is improved, the uneven distribution of the exhaust steam in an exhaust pipeline is reduced, the equipment cost is reduced, and the system plays an extremely important role in the safe and economic operation of the whole power plant; the existing air-cooling condenser radiator of the early-stage operated direct air-cooling unit adopts a plurality of rows of tubes (three rows of tubes or two rows of tubes), and due to the structural characteristics, the sectional area of a tube bundle base tube is smaller, and a plurality of rows of tube bundles are arranged in a staggered manner, so that the pressure drop of the steam side is large, the operation back pressure is high, and the power consumption is also high; particularly, after the equipment runs for a long time, the common phenomena of aging and heat transfer efficiency reduction of the radiator occur, and the ventilation and heat dissipation performance of the air cooling system are seriously influenced; in the actual operation process, the flow state of the fan outlet of the direct air cooling system is in a non-uniform rotational flow type, so that the flow field distribution of the air inlet and outlet of the air-cooled condenser is non-uniform, particularly, air inlet dead corners are easily formed at the heat exchange surface at the bottom of the air-cooled condenser, the heat exchange efficiency of the air-cooled condenser is directly influenced, and the load output of a unit is insufficient or the coal consumption is increased after the factors are superposed; at present, a common modification technical route is to increase capacity of an air cooling system, namely, a path of exhaust steam pipeline is led out from the existing air cooling exhaust steam pipeline, a site capable of meeting technical modification requirements is found, a small-scale air cooling island is newly added, and if the site available for capacity increase is limited on site, the capacity increase air cooling scale is too small and the effect of reducing back pressure is limited; if the capacity increasing field is feasible, the capacity increasing is large in air cooling scale, and the defect of high investment (equivalent to large-scale reestablishment of an air cooling island) exists; in addition, the transformation scheme also relates to the problems that pipelines such as steam exhaust, condensed water, vacuumizing and the like need to be newly added, and the electrical and thermal control also needs to be augmented, so that the transformation difficulty is high.
Disclosure of Invention
The invention provides a method for improving a direct air cooling system, which enables an air cooling condenser to have the effects of saving energy and prolonging the service life, prolongs the service life of an early-stage operated direct air cooling system, and improves the heat economy of an operating unit.
The invention solves the technical problems by the following technical scheme:
the general concept of the invention is: the original three-row pipe or double-row pipe large A-shaped air-cooled condenser is removed, and double small A-shaped air-cooled condensers which are arranged side by side are manufactured according to the size of the space occupied by the original three-row pipe or double-row pipe large A-shaped air-cooled condenser, namely, one fan cooling unit corresponds to two small A-shaped air-cooled condensers which are arranged side by side, the double small A-shaped air-cooled condensers are in a self-supporting structural form, and a steel A-shaped bracket is not required to be arranged; changing a fan unit into low-position arrangement, communicating high-position horizontal sections of two main steam exhaust pipelines of a direct air cooling system together, replacing a communicating pipe between vertical sections of traditional steam exhaust pipelines, marking the top of the horizontal steam exhaust pipeline arranged at the high position to be higher, and improving the top to be basically parallel to a cantilever beam on a steel truss so as to reduce the length of the vertical section of a steam exhaust branch pipe, and fixing the high-position horizontal steam exhaust pipeline on an air cooling strut through a constant force bracket; meanwhile, the ascending branch pipe of the exhaust pipeline is changed into two small-caliber pipelines from a conventional large caliber, one large-caliber pipe is changed into two independent small-caliber pipes, and one large-caliber pipe is changed into two small-caliber pipes through a tee joint; the other scheme is that the original large A-shaped air-cooled condenser with three rows of pipes or two rows of pipes is removed and replaced by the large A-shaped air-cooled condenser with a single row of pipes according to the size of the space occupied by the original large A-shaped air-cooled condenser with three rows of pipes or two rows of pipes.
A direct air cooling system transformation method for enabling an air cooling condenser to have energy-saving and life-prolonging effects comprises an original large A-shaped air cooling condenser with three rows of tubes or two rows of tubes, and is characterized by comprising the following steps:
firstly, measuring the space size of an original large A-shaped air-cooled condenser with three rows of tubes or two rows of tubes, and manufacturing double small A-shaped air-cooled condensers which are arranged side by side according to the size, wherein the double small A-shaped air-cooled condenser is in a self-supporting structure form, a steel A-shaped bracket is not required to be arranged, and the left small A-shaped air-cooled condenser and the right small A-shaped air-cooled condenser in the double small A-shaped air-cooled condenser are arranged independently and side by side;
secondly, dismantling the original large A-shaped air-cooled condenser with three rows of tubes or two rows of tubes, and refitting an air-cooled axial flow fan unit on a lower suspension beam of the steel truss platform;
thirdly, removing an upper header of an original large A-shaped air-cooled condenser with three rows of pipes or two rows of pipes connected with a high-level horizontal section of a main steam exhaust pipeline and a vertical riser communicated with the upper header;
fourthly, raising the high-level horizontal section of the main steam exhaust pipeline to a position parallel to the upper cantilever of the steel truss;
fifthly, mounting the double small A-shaped air-cooled condenser manufactured in the first step into the mounting space of the original three-row pipe or double-row pipe large A-shaped air-cooled condenser;
and sixthly, communicating the steam exhaust device with one end of the ground horizontal section of the main steam exhaust pipeline, connecting the vertical section of the main steam exhaust pipeline at the other end of the ground horizontal section of the main steam exhaust pipeline, communicating an upper port of the vertical section of the main steam exhaust pipeline with the improved high-level horizontal section of the main steam exhaust pipeline, arranging ascending branch pipes at intervals on the high-level horizontal section of the main steam exhaust pipeline, communicating the other ends of the ascending branch pipes with an upper header of the left small A-shaped air-cooled condenser, and communicating the other end of the other ascending branch pipe with an upper header of the right small A-shaped air-cooled condenser.
The upper header is provided with a transverse large pull rod expansion joint, and the upper lifting branch pipe is provided with a vacuum electric valve; and a closed rectangular ventilation channel is arranged between the outlet of the air-cooled axial flow fan unit and the bottom ports of the two small A-shaped air-cooled condensers which are arranged in parallel, and the length of the closed rectangular ventilation channel is 5-8 m.
A direct air cooling system transformation method for enabling an air cooling condenser to have energy-saving and life-prolonging effects comprises an original large A-shaped air cooling condenser with three rows of tubes or two rows of tubes, and is characterized by comprising the following steps:
the method comprises the following steps of firstly, measuring the space size of the original large A-shaped air-cooling condenser with three or two rows of pipes, and manufacturing a single-row pipe large A-shaped air-cooling condenser according to the size, wherein the single-row pipe large A-shaped air-cooling condenser is in a self-supporting structure form, and a steel A-shaped support does not need to be arranged;
secondly, dismantling the original large A-shaped air-cooled condenser with three rows of tubes or two rows of tubes, and refitting an air-cooled axial flow fan unit on a lower suspension beam of the steel truss platform;
thirdly, removing an upper header of an original large A-shaped air-cooled condenser with three rows of pipes or two rows of pipes connected with a high-level horizontal section of a main steam exhaust pipeline and a vertical riser communicated with the upper header;
fourthly, raising the high-level horizontal section of the main steam exhaust pipeline to a position parallel to the upper cantilever of the steel truss;
fifthly, mounting the single-row large A-shaped air-cooled condenser manufactured in the first step into the mounting space of the original three-row or double-row large A-shaped air-cooled condenser;
and sixthly, communicating the steam exhaust device with one end of the ground horizontal section of the main steam exhaust pipeline, connecting the vertical section of the main steam exhaust pipeline at the other end of the ground horizontal section of the main steam exhaust pipeline, communicating an upper port of the vertical section of the main steam exhaust pipeline with the improved high-level horizontal section of the main steam exhaust pipeline, arranging ascending branch pipes at intervals on the high-level horizontal section of the main steam exhaust pipeline, and communicating the other ends of the ascending branch pipes with an upper header of the single-row-pipe large A-type air-cooled condenser.
The single-row pipe large A-shaped air-cooled condenser pipe bundle adopts a short-side long flat pipe, the size of the long side is 210 plus 220 mm, two ends of the short side are semicircular, the diameter of the semicircle is 18-20 mm, and the length of the pipe bundle is 8-12 m.
The invention has simple technical measures, better freezing resistance, reliability and economy, shorter transformation time and no need of additional land occupation; the direct air cooling thermal power generating unit is suitable for a direct air cooling thermal power generating unit adopting three-row pipes or two-row pipes at a level of 30MW to 600 MW.
Drawings
FIG. 1 is a schematic structural view of a double-small "A" type air-cooled condenser used in the present invention;
fig. 2 is a schematic diagram of the structure in the left-hand direction in fig. 1;
FIG. 3 is a schematic structural diagram of the present invention in which the ground horizontal section 2 of the main exhaust steam pipeline and the ground horizontal section 13 of the right main exhaust steam pipeline of the double-small A-type air-cooled condenser are arranged in parallel;
FIG. 4 is a schematic structural view of a single-row large A-type air-cooled condenser according to the present invention;
fig. 5 is a schematic structural view of a direct air-cooling system when an original three-row or two-row large a-type air-cooling condenser is modified.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings:
a direct air cooling system transformation method for enabling an air cooling condenser to have energy-saving and life-prolonging effects comprises an original large A-shaped air cooling condenser with three rows of tubes or two rows of tubes, and is characterized by comprising the following steps:
firstly, measuring the space size of an original large A-shaped air-cooled condenser with three rows of pipes or two rows of pipes, and manufacturing double small A-shaped air-cooled condensers which are arranged side by side according to the size, wherein the double small A-shaped air-cooled condenser is in a self-supporting structure form, a steel A-shaped bracket is not required to be arranged, and a left small A-shaped air-cooled condenser 7 and a right small A-shaped air-cooled condenser 8 in the double small A-shaped air-cooled condenser are arranged independently in parallel;
secondly, dismantling the original large A-shaped air-cooled condenser with three or two calandrias, and modifying an air-cooled axial flow fan set 12 on a lower suspension girder of the steel truss platform 11;
thirdly, removing an upper header of a large A-shaped air-cooled condenser connected with three rows of pipes or two rows of pipes on the high-level horizontal section of the original main steam exhaust pipeline and a vertical ascending pipe communicated with the upper header;
fourthly, raising the high-level horizontal section of the main steam exhaust pipeline to a position parallel to the upper suspension beam of the steel truss;
fifthly, mounting the double small A-shaped air-cooled condenser manufactured in the first step into the mounting space of the original three-row pipe or double-row pipe large A-shaped air-cooled condenser;
and sixthly, communicating the steam exhaust device 1 with one end of a ground horizontal section 2 of a main steam exhaust pipeline, connecting a vertical section 3 of the main steam exhaust pipeline at the other end of the ground horizontal section 2 of the main steam exhaust pipeline, communicating an upper port of the vertical section 3 of the main steam exhaust pipeline with a raised high-level horizontal section 4 of the main steam exhaust pipeline, arranging ascending branch pipes 5 on the high-level horizontal section 4 of the main steam exhaust pipeline at intervals, communicating the other ends of the ascending branch pipes 5 with an upper header 6 of a left small A-type air-cooled condenser 7, and communicating the other ends of the other ascending branch pipes with an upper header of a right small A-type air-cooled condenser 8.
A direct air cooling system of a double-small A-shaped air cooling condenser comprises an exhaust device 1, a steel truss platform 11 and air cooling axial flow fan groups 12, wherein a left small A-shaped air cooling condenser 7 and a right small A-shaped air cooling condenser 8 are arranged on the steel truss platform 11 corresponding to each air cooling axial flow fan group 12 in parallel, and the left small A-shaped air cooling condenser 7 and the right small A-shaped air cooling condenser 8 are condensers in a self-supporting structural form of a single exhaust pipe; the steam exhaust device 1 is communicated with one end of a ground horizontal section 2 of a main steam exhaust pipeline, a vertical section 3 of the main steam exhaust pipeline is connected to the other end of the ground horizontal section 2 of the main steam exhaust pipeline, a high-level horizontal section 4 of the main steam exhaust pipeline is communicated with an upper port of the vertical section 3 of the main steam exhaust pipeline, ascending branch pipes 5 are arranged on the high-level horizontal section 4 of the main steam exhaust pipeline at intervals, the other ends of the ascending branch pipes 5 are communicated with an upper header 6 of a left small A-shaped air-cooled condenser 7, and the other ends of the other ascending branch pipes are communicated with an upper header of a right small A-shaped air-cooled condenser 8; the upper header 6 is provided with a single hinge expansion joint 9, and the upper lifting branch pipe 5 is provided with a vacuum electric valve 10.
The air-cooled axial flow fan set 12 is arranged on a lower suspension beam of the steel truss platform 11, a closed rectangular ventilation channel is arranged between an outlet of the air-cooled axial flow fan set 11 and bottom end ports of two small A-shaped air-cooled condensers which are arranged in parallel, and the length of the closed rectangular ventilation channel is 5-8 m.
The improved direct air cooling system of the double small A-shaped air cooling condenser comprises an exhaust device 1, a steel truss platform 11, an air cooling axial flow fan group 12, a main exhaust pipeline ground horizontal section 2 and a right main exhaust pipeline ground horizontal section 13, wherein the exhaust device 1 is respectively communicated with an inlet of the main exhaust pipeline ground horizontal section 2 and an inlet of the right main exhaust pipeline ground horizontal section 13, a left small A-shaped air cooling condenser 7 and a right small A-shaped air cooling condenser 8 are arranged on the steel truss platform 11 corresponding to each air cooling axial flow fan group 12 in parallel, and the left small A-shaped air cooling condenser 7 and the right small A-shaped air cooling condenser 8 are self-supporting structural condensers with a single exhaust pipe; the steam exhaust device 1 is communicated with one end of a ground horizontal section 2 of a main steam exhaust pipeline, a vertical section 3 of the main steam exhaust pipeline is connected to the other end of the ground horizontal section 2 of the main steam exhaust pipeline, a high-level horizontal section 4 of the main steam exhaust pipeline is communicated with an upper port of the vertical section 3 of the main steam exhaust pipeline, ascending branch pipes 5 are arranged on the high-level horizontal section 4 of the main steam exhaust pipeline at intervals, the other ends of the ascending branch pipes 5 are communicated with an upper header 6 of a left small A-shaped air-cooled condenser 7, and the other ends of the other ascending branch pipes are communicated with an upper header of a right small A-shaped air-cooled condenser 8; the upper header 6 is provided with a single hinge expansion joint 9, the upper lifting branch pipe 5 is provided with a vacuum electric valve 10, and the expansion joint is not arranged; the top port of the right main steam exhaust pipeline ground horizontal section 13 is communicated with the main steam exhaust pipeline high-level horizontal section 4, the top port of the main steam exhaust pipeline ground horizontal section 2 is communicated with the main steam exhaust pipeline high-level horizontal section 4, and the main steam exhaust pipeline ground horizontal section 2 and the right main steam exhaust pipeline ground horizontal section 13 are arranged in parallel.
After transformation, when an air cooling system of the unit operates, a ground horizontal section 2 of a main steam exhaust pipeline is connected from a steam exhaust device 1 of each unit, the horizontal section passes through a steam engine room to the outside of a row A, then the vertical section is lifted to a certain height perpendicular to the ground, a high-level horizontal section 4 of the main steam exhaust pipeline is connected, a vertical section 3 of the main steam exhaust pipeline and the high-level horizontal section 4 of the main steam exhaust pipeline are in a T shape, the top elevation of the high-level horizontal section 4 of the main steam exhaust pipeline is improved to a position basically parallel to a suspension beam on a steel truss so as to reduce the vertical section length of a steam exhaust branch pipe, the length of the steam exhaust branch pipe is shortened to 8-10 meters from the original 20 meters, the high-level horizontal section 4 of the steam exhaust pipeline is fixed on an air cooling support through a constant force support, meanwhile, the steam exhaust pipeline lifting branch pipe is changed from a conventional large caliber into two small caliber pipelines, and is horizontally communicated with an upper connecting box 6 of each new cooling radiator through a 90-degree elbow, the vacuum electric valve 10 is arranged on the upper branch lifting pipe 5, the air cooling radiator is arranged by a double-small A-shaped structure of a left group of pipe bundles and a right group of pipe bundles, a fan set (an axial flow fan, an air duct, a motor and a gear box) is arranged on a fan bridge frame below the double-small A-shaped air cooling radiator, the arrangement position of the air cooling fan set (the axial flow fan, the air duct, the motor and the gear box) is lowered onto a lower suspension beam of a steel truss platform 11, namely, the upper edge of the fan wind barrel is fixed on the lower bottom surface of the steel truss platform 11, each group of air-cooled axial flow fan groups 12 are separated separately through a partition wall and a side plate, a closed rectangular ventilation rectification channel with the length of about 5-8 m is formed between the outlet of each air-cooled axial flow fan set 12 and the double small 'A' air-cooled radiators, so that the air inlet of each fan is not influenced mutually, and the flow nonuniformity of each fan is improved.
After transformation, the tube bundle of the novel small A-shaped air-cooled condenser adopts a short-side long flat tube, the size of the long side is 160-171 mm, two ends of the short side are semicircular, the width (the diameter of the semicircle) is 9-11 mm, the length of the tube bundle is about 4-6 m, a double small A-shaped structure is formed, a self-supporting structural form is adopted, and a steel A-shaped frame is not required to be arranged; the invention provides a direct air cooling system adopting a novel double-small 'A' -shaped tube bundle fan low-position arrangement, the optimization effect of the air cooling radiator flow field is further obvious, the flow field below the inlet surface of the air cooling radiator tends to be further uniform, the outlet speed of the radiator is increased by about 3%, the arrangement of an exhaust steam pipeline is optimized, the pressure loss of the direct air cooling exhaust steam pipeline is reduced, and meanwhile, the operating electricity cost and the manufacturing cost can be reduced.
A direct air cooling system transformation method for enabling an air cooling condenser to have energy-saving and life-prolonging effects comprises an original large A-shaped air cooling condenser with three rows of tubes or two rows of tubes, and is characterized by comprising the following steps:
firstly, measuring the space size of an original large A-shaped air-cooled condenser with three rows of pipes or two rows of pipes, and manufacturing a single-row-pipe large A-shaped air-cooled condenser according to the size, wherein the single-row-pipe large A-shaped air-cooled condenser is in a self-supporting structure form, and a steel A-shaped bracket is not required to be arranged;
secondly, dismantling the original large A-shaped air-cooled condenser with three rows of tubes or two rows of tubes, and modifying an air-cooled axial flow fan unit 12 on a lower suspension beam of a steel truss platform 11;
thirdly, removing an upper header of an original large A-shaped air-cooled condenser with three rows of pipes or two rows of pipes connected with a high-level horizontal section of a main steam exhaust pipeline and a vertical riser communicated with the upper header;
fourthly, raising the high-level horizontal section of the main steam exhaust pipeline to a position parallel to the upper cantilever of the steel truss;
fifthly, mounting the single-row large A-shaped air-cooled condenser manufactured in the first step into the mounting space of the original three-row or double-row large A-shaped air-cooled condenser;
and sixthly, communicating the steam exhaust device 1 with one end of a ground horizontal section 2 of a main steam exhaust pipeline, connecting a vertical section 3 of the main steam exhaust pipeline at the other end of the ground horizontal section 2 of the main steam exhaust pipeline, communicating an upper port of the vertical section 3 of the main steam exhaust pipeline with a high-level horizontal section 4 of the improved main steam exhaust pipeline, arranging ascending branch pipes 5 on the high-level horizontal section 4 of the main steam exhaust pipeline at intervals, and communicating the other ends of the ascending branch pipes 5 with an upper header 6 of a single-row-pipe large A-type air-cooled condenser.
The single-row pipe large A-shaped air-cooled condenser pipe bundle adopts a short-side long flat pipe, the size of the long side is 210-220 mm, two ends of the short side are semicircular, the width (the diameter of the semicircle) is 18-20 mm, the length of the pipe bundle is about 8-12 m, the arrangement position of air-cooled fan sets (an axial flow fan, a wind cylinder, a motor and a gear box) can be reduced to a lower suspension beam of a steel truss platform 11, namely the upper edge of the wind cylinder of the fan is fixed on the lower bottom surface of the steel truss platform, and each air-cooled fan set unit is separated independently through a partition wall and a side plate; the arrangement position of the air cooling fan set (the axial flow fan, the air cylinder, the motor and the gear box) can also be maintained on the upper cantilever beam of the steel truss platform 11, namely the upper edge of the fan air cylinder is fixed on the upper bottom surface of the steel truss platform; the invention provides a direct air cooling system adopting a novel large A-shaped tube bundle fan low-position arrangement, the optimization effect of the flow field of an air cooling radiator is further obvious, the flow field below the inlet surface of the air cooling radiator further tends to be uniform, the outlet speed of the radiator is increased by about 1.5%, the arrangement of an exhaust steam pipeline is optimized, the pressure loss of the direct air cooling exhaust steam pipeline is reduced, and the operating electricity cost and the manufacturing cost can be reduced.
The improved direct air cooling system of the single-exhaust-pipe large A-type air cooling condenser comprises an exhaust device 1, a steel truss platform 11, an air cooling axial flow fan group 12, a main exhaust pipeline ground horizontal section 2 and a right main exhaust pipeline ground horizontal section 13, wherein the exhaust device 1 is respectively communicated with an inlet of the main exhaust pipeline ground horizontal section 2 and an inlet of the right main exhaust pipeline ground horizontal section 13, and a single-exhaust-pipe large A-type air cooling condenser 15 which is a condenser in a single-exhaust-pipe self-supporting structure form is arranged on the steel truss platform 11 corresponding to each group of air cooling axial flow fan groups 12; the steam exhaust device 1 is communicated with one end of a ground horizontal section 2 of a main steam exhaust pipeline, the other end of the ground horizontal section 2 of the main steam exhaust pipeline is connected with a vertical section 3 of the main steam exhaust pipeline, the upper port of the vertical section 3 of the main steam exhaust pipeline is communicated with a high-level horizontal section 4 of the main steam exhaust pipeline, ascending branch pipes 5 are arranged on the high-level horizontal section 4 of the main steam exhaust pipeline at intervals, and the other ends of the ascending branch pipes 5 are communicated with an upper connecting box 6 of a single-row-pipe large A-shaped air-cooled condenser 15; a transverse large pull rod expansion joint 9 is arranged on the upper header 6, a vacuum electric valve 10 is arranged on the upper lifting branch pipe 5, and no expansion joint is arranged; the top port of the right main steam exhaust pipeline ground horizontal section 13 is communicated with the main steam exhaust pipeline high-level horizontal section 4, the top port of the main steam exhaust pipeline ground horizontal section 2 is communicated with the main steam exhaust pipeline high-level horizontal section 4, and the main steam exhaust pipeline ground horizontal section 2 and the right main steam exhaust pipeline ground horizontal section 13 are arranged in parallel.
After transformation, when an air cooling system of the unit operates, a ground horizontal section 2 of a main steam exhaust pipeline is connected from a steam exhaust device 1 of each unit, the horizontal section passes through a steam engine room to the outside of the A row, then the vertical section is lifted to a certain height perpendicular to the ground, a high-level horizontal section 4 of the main steam exhaust pipeline is connected, the vertical section 3 of the main steam exhaust pipeline and the high-level horizontal section 4 of the main steam exhaust pipeline are in a T shape, the top elevation of the high-level horizontal section 4 of the main steam exhaust pipeline is raised to a position basically parallel to a suspension beam on a steel truss so as to reduce the vertical section length of a steam exhaust branch pipe, the length of the steam exhaust branch pipe is shortened to 8-10 meters from the original 20 meters, the high-level horizontal section 4 of the main steam exhaust pipeline is fixed on an air cooling support through a constant force support, meanwhile, the steam exhaust pipeline ascending branch pipe is horizontally communicated with an upper header 6 of each group of new cold radiators through a 90-degree elbow, a transverse large pull rod expansion joint 9 is arranged on the upper header 6, the vacuum electric valve 10 is arranged on the upper branch lifting pipe 5 without an expansion joint, the air cooling radiator is arranged by a left group of pipe bundles and a right group of pipe bundles in a large A-shaped structure, a fan set (an axial flow fan, an air duct, a motor and a gear box) is arranged on a fan bridge frame below a large A-shaped air cooling radiator 15, the arrangement position of the air cooling fan set (the axial flow fan, the air duct, the motor and the gear box) is lowered to the lower suspension beam of the steel truss platform 11, namely, the upper edge of the fan wind barrel is fixed on the lower bottom surface of the steel truss platform 11, each group of air-cooled axial flow fan groups 12 are separated separately through a partition wall and a side plate, a closed rectangular ventilation rectification channel with the length of about 5-8 m is formed between the outlet of each air-cooled axial flow fan set 12 and the large A-shaped air-cooled radiator, so that the air inlet of each fan is not influenced mutually, and the flow nonuniformity of each fan is improved.
Claims (4)
1. A direct air cooling system transformation method for enabling an air cooling condenser to have energy-saving and life-prolonging effects comprises an original large A-shaped air cooling condenser with three rows of tubes or two rows of tubes, and is characterized by comprising the following steps:
firstly, measuring the space size of an original large A-shaped air-cooled condenser with three rows of pipes or two rows of pipes, and manufacturing double small A-shaped air-cooled condensers which are arranged side by side according to the size, wherein the double small A-shaped air-cooled condenser is in a self-supporting structure form, a steel A-shaped bracket is not required to be arranged, and a left small A-shaped air-cooled condenser (7) and a right small A-shaped air-cooled condenser (8) in the double small A-shaped air-cooled condenser are arranged in parallel and independently;
secondly, the original large A-shaped air-cooled condenser with three rows of tubes or two rows of tubes is dismantled, and an air-cooled axial flow fan unit (12) is refitted on a lower suspension beam of the steel truss platform (11);
thirdly, removing an upper header of an original large A-shaped air-cooled condenser with three rows of pipes or two rows of pipes connected with a high-level horizontal section of a main steam exhaust pipeline and a vertical riser communicated with the upper header;
fourthly, raising the high-level horizontal section of the main steam exhaust pipeline to a position parallel to the upper cantilever of the steel truss;
fifthly, mounting the double small A-shaped air-cooled condenser manufactured in the first step into the mounting space of the original three-row pipe or double-row pipe large A-shaped air-cooled condenser;
and sixthly, communicating the steam exhaust device (1) with one end of a ground horizontal section (2) of a main steam exhaust pipeline, connecting a vertical section (3) of the main steam exhaust pipeline with the other end of the ground horizontal section (2) of the main steam exhaust pipeline, communicating an upper port of the vertical section (3) of the main steam exhaust pipeline with a raised high-level horizontal section (4) of the main steam exhaust pipeline, arranging ascending branch pipes (5) on the high-level horizontal section (4) of the main steam exhaust pipeline at intervals, communicating the other end of each ascending branch pipe (5) with an upper connecting box (6) of a left small A-shaped air-cooled condenser (7), and communicating the other end of the other ascending branch pipe with an upper connecting box of a right small A-shaped air-cooled condenser (8).
2. The method for improving the direct air cooling system of the air-cooled condenser with the effects of saving energy and prolonging the service life of the condenser is characterized in that a transverse large pull rod expansion joint (9) is arranged on the upper header (6), and a vacuum electric valve (10) is arranged on the upper branch lifting pipe (5); a closed rectangular ventilation channel is arranged between the outlet of the air-cooled axial flow fan set (12) and the bottom ports of the two small A-shaped air-cooled condensers which are arranged in parallel, and the length of the closed rectangular ventilation channel is 5-8 m.
3. A direct air cooling system transformation method for enabling an air cooling condenser to have energy-saving and life-prolonging effects comprises an original large A-shaped air cooling condenser with three rows of tubes or two rows of tubes, and is characterized by comprising the following steps:
firstly, measuring the space size of an original large A-shaped air-cooled condenser with three rows of pipes or two rows of pipes, and manufacturing a single-row-pipe large A-shaped air-cooled condenser according to the size, wherein the single-row-pipe large A-shaped air-cooled condenser is in a self-supporting structure form, and a steel A-shaped bracket is not required to be arranged;
secondly, the original large A-shaped air-cooled condenser with three rows of tubes or two rows of tubes is dismantled, and an air-cooled axial flow fan unit (12) is refitted on a lower suspension beam of the steel truss platform (11);
thirdly, removing an upper header of an original large A-shaped air-cooled condenser with three rows of pipes or two rows of pipes connected with a high-level horizontal section of a main steam exhaust pipeline and a vertical riser communicated with the upper header;
fourthly, raising the high-level horizontal section of the main steam exhaust pipeline to a position parallel to the upper cantilever of the steel truss;
fifthly, mounting the single-row large A-shaped air-cooled condenser manufactured in the first step into the mounting space of the original three-row or double-row large A-shaped air-cooled condenser;
sixthly, communicating the steam exhaust device (1) with one end of the ground horizontal section (2) of the main steam exhaust pipeline, connecting the vertical section (3) of the main steam exhaust pipeline at the other end of the ground horizontal section (2) of the main steam exhaust pipeline, communicating the upper port of the vertical section (3) of the main steam exhaust pipeline with the high-level horizontal section (4) of the main steam exhaust pipeline after being improved, arranging ascending branch pipes (5) at intervals on the high-level horizontal section (4) of the main steam exhaust pipeline, and communicating the other end of the ascending branch pipes (5) with the upper header (6) of the single-row-pipe large A-type air-cooled condenser.
4. The method as claimed in claim 3, wherein the single-row tube large "A" type air-cooled condenser tube bundle is a long flat tube with a short side, the long side is 210 mm and 220 mm, the two ends of the short side are semicircular, the diameter of the semicircle is 18-20 mm, and the length of the tube bundle is 8-12 m.
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