CN110470432B - Condenser and overhauling and leakage detecting method thereof - Google Patents
Condenser and overhauling and leakage detecting method thereof Download PDFInfo
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- CN110470432B CN110470432B CN201910771613.8A CN201910771613A CN110470432B CN 110470432 B CN110470432 B CN 110470432B CN 201910771613 A CN201910771613 A CN 201910771613A CN 110470432 B CN110470432 B CN 110470432B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/003—Arrangements for measuring or testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
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Abstract
A condenser and a method for examining and repairing the condenser are provided, when examining and repairing the condenser, condensed water and cooling water of the condenser are discharged, a first control valve, a second control valve, a cooling water outlet, a cooling water inlet and all inlets and outlets of the condenser are closed after vacuum is formed in a heat exchange chamber and a heat exchange pipe, cooling water is filled in from a steam inlet, the whole shell and a steam inlet chamber are filled, the wall surface of the shell, the wall surface of the heat exchange pipe and all accessory equipment are checked after the cooling water stays for 15-30 hours, if water seeps out, the position of the seeped water is marked, and if the water seeps out, the water does not leak, and the examination and repair of the condenser are completed. And opening a second control valve, breaking a door interface, a cooling water inlet and a cooling water outlet by vacuum at the steam inlet chamber, enabling the cooling water in the heat exchange chamber and the steam inlet chamber of the condenser to enter the heat exchange pipe after passing through the second valve, and further refluxing the cooling water into a cooling water storage tank at the bottom of the indirect cooling tower through the cooling water outlet to finish the recycling of the water for overhauling and checking leakage.
Description
Technical Field
The invention relates to a condenser, in particular to a condenser and a method for overhauling and detecting leakage of the condenser.
Background
The steam output by the steam turbine is cooled by the condenser of the large-scale thermal power plant to form condensed water, and the condensed water returns to the boiler after passing through the condensed water pump and is recycled. However, after the condenser is used for a period of time, the heat exchange tubes and the heat exchange chambers in the condenser need to be cleaned, and the cleaned heat exchange tubes and the heat exchange chambers are checked to see whether damaged leakage exists or not and whether leakage exists in the whole condenser vacuum system or not. Utilize chemical liquid medicine to check after leaking, can use the clear water to wash, all directly do the direct emission processing with washing water and chemical liquid medicine through condenser condensate outlet after the washing to need set up the discharge tube way alone for direct discharge process, arrange according to present whole factory building, this discharge tube way needs to wear steam turbine room B row, 1# -2# boiler room, electric precipitation region down, there is with high costs, extravagant water resource moreover, the problem of polluted environment.
Disclosure of Invention
The invention aims to provide a condenser and a method for overhauling and checking leakage of the condenser, which can effectively solve the problems in overhauling and checking leakage.
The invention relates to a method for overhauling and detecting leakage of a condenser, which comprises a shell, wherein the bottom of the shell is fixedly connected with the ground through a support, a heat exchange chamber is formed in the shell, a neck connected with a steam outlet of a steam turbine is fixedly connected to the top of the shell to form a steam inlet chamber, a plurality of heat exchange tubes are fixedly arranged in the shell in parallel, one ends of all the heat exchange tubes are communicated with a return water chamber at the tail end of the shell, and the other ends of the heat exchange tubes are communicated with a cooling water outlet and a cooling water inlet at the front end of the shell;
the tail end of the shell is provided with two return water chambers, two groups of cooling water outlets and cooling water inlets are arranged at the front end of the shell, the cooling water outlets and the cooling water inlets of each group are arranged in parallel up and down, and the cooling water outlets and the cooling water inlets of each group respectively correspond to one half of heat exchange tubes in the shell and one return water chamber at the tail end;
a main condensation water outlet communicated with a boiler water inlet pipe is arranged in the middle of the bottom of the shell, and is controlled to open and close by a first control valve;
the bottom of the return water chamber is provided with a water chamber water outlet, and the top of the return water chamber and the top of the cooling water outlet are provided with water chamber air outlets;
when overhauling and leakage checking, discharging condensed water in the heat exchange chamber of the condenser and cooling water in the heat exchange pipe, closing a first control valve, a second control valve, a cooling water outlet, a cooling water inlet and all inlets and outlets of the condenser after the heat exchange chamber and the heat exchange are both in a vacuum state, directly canning the cooling water for cooling in the heat exchange pipe from a steam inlet at the top of the connecting neck until the whole condenser shell and the steam inlet chamber are filled, checking the shell wall surface of the condenser, the heat exchange pipe wall surface and all accessory equipment after staying for 15-30 hours, marking the position of the leaked water if the water is leaked, finishing overhauling and leakage checking if the water is not leaked, opening the second control valve, breaking a vacuum port at the steam inlet chamber, a cooling water inlet and a cooling water outlet, and feeding the cooling water in the heat exchange chamber and the steam inlet chamber of the condenser into the heat exchange pipe through the second valve, and further flows back to a cooling water storage tank at the bottom of the indirect cooling tower through a cooling water outlet to finish the recycling of water for overhauling and checking leakage.
The second control valve is arranged on a first pipeline for communicating the shell side water outlet with the cooling water inlet, and two three-way valves, namely a first three-way control valve and a second three-way control valve, are additionally arranged on a pipeline in front of the cooling water inlet, so that the cooling water inlet is communicated with the cooling water storage tank at the bottom of the indirect cooling tower and is communicated with the two shell side water outlets after passing through the second control valve.
And the cooling water storage tank at the bottom of the indirect cooling tower is communicated with a steam inlet at the top of the steam inlet chamber through a second three-way control valve, a second pipeline and a third control valve.
The condenser neck comprises a steam inlet chamber connected with the top of the shell and a square steam exhaust connecting pipe fixedly connected with the top of the steam inlet chamber, the steam inlet chamber and the steam exhaust connecting pipe are in transitional connection through a square fixing plate, the steam exhaust connecting pipe comprises a square vertical pipe fixedly connected by welding and a fixing ring plate positioned at the top of the square vertical pipe, a plurality of through holes are formed in the pipe wall of the square vertical pipe, metal elastic sheets are fixed on the inner wall surface of the square vertical pipe and used for sealing all the through holes, a metal buckle is arranged outside each through hole in a sealing mode, and an elastic sleeve is sleeved outside each metal buckle in a sealing mode.
After the existing condenser structure is transformed according to the technical scheme of the invention, a circulating water pipeline arranged by penetrating a main factory building under a three-tower-in-one or two-machine-one tower can be directly used, so that the construction land can be effectively reduced, the land cost is saved, the total amount of the circulating water pipeline is reduced, the pipe resistance is reduced, the service power consumption is reduced, and the engineering cost reduction effect is obvious. According to the technical scheme, after the technical scheme is adopted, the water for overhauling and leakage detection of the condenser directly utilizes the pipeline of the existing condenser to cool circulating water, returns to the lower part of a water chamber from the condenser and passes through a steam turbine room, a 1# -2# boiler room and an electric dust removal area to enter a circulating water pump room, and can effectively solve the problem that the pipeline needs to be additionally arranged in the prior art.
Drawings
Fig. 1 is a schematic diagram of the operation of a thermal power plant according to the present invention.
Fig. 2 is a schematic front view of a condenser according to the present invention.
Fig. 3 is a left side view schematically showing a condenser according to the present invention.
Fig. 4 is a schematic right view of a condenser according to the present invention.
Fig. 5 is a schematic plan view of a condenser according to the present invention.
Fig. 6 is an enlarged cross-sectional view at a in fig. 3.
Fig. 7 is an enlarged cross-sectional view at B in fig. 2.
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The orientations such as front, rear, left, right, up, down, and the like in the following embodiments are defined by the condenser state shown in fig. 1, and the specific orientations are different depending on the position where the condenser is placed.
As shown in fig. 2, 3, 4 and 5, the condenser 1 of the present invention includes a housing 10 whose bottom is fixedly connected to the ground through a support, and a space of 0.5-1 m is formed between the lower surface of the housing 10 and the ground, so as to facilitate connection and installation of equipment at the bottom of the housing 10. As shown in fig. 6, a heat exchange chamber is formed inside the casing 10, and a neck 11 forming the steam inlet chamber 9 and connected to the steam outlet of the steam turbine 4 is fixedly connected to the top of the casing 10. A plurality of heat exchange tubes (not shown in the figure) are fixedly installed inside the shell 10 in parallel, two return water chambers 12 are arranged at the rear end of the shell 10, two cooling water outlets 13 and two cooling water inlets 14 are arranged at the front end of the shell 10, the front end and the rear end of each heat exchange tube are respectively connected and fixed through tube plates 79 and are not communicated with the heat exchange chambers inside the shell 10, as shown in fig. 7, the tail ends of the heat exchange tubes are communicated with the return water chambers 12, the front end parts of the heat exchange tubes are communicated with the cooling water outlets 13, and part of the heat exchange tubes are.
As shown in fig. 4, a cooling water outlet 13 is formed in a group with a cooling water inlet 14, and communicates with a heat exchange tube inside the casing 10, and further communicates with a return water chamber 12 at the rear end via the heat exchange tube. Each group of cooling water outlets 13 and cooling water inlets 14 are arranged in parallel up and down, the cooling water outlets 13 are located above the cooling water inlets 14, and each group of cooling water outlets 13 and cooling water inlets 14 respectively correspond to half of the heat exchange tubes in the shell 4. The cooling water enters the heat exchange tube through the cooling water inlet 14, enters the return water chamber 12, returns to the cooling water outlet 13 through the heat exchange tube from the return water chamber 12, and further enters the cooling water storage tank at the bottom of the indirect cooling tower 2, as shown in fig. 1.
As shown in fig. 1, 2 and 3, a main condensed water outlet 18 communicated with a water inlet pipe of a boiler 3 is provided at a middle position of the bottom of a casing 10, the main condensed water outlet 18 is connected with the water inlet pipe of the boiler 3 after passing through a first control valve 6, a casing side water discharge port 15 is provided at both ends of the bottom of the casing 10 near a return water chamber 12 and a cooling water inlet 14, the two casing side water discharge ports 15 and the main condensed water outlet 18 are positioned on the same straight line, the two casing side water discharge ports 15 are communicated with one or two of two cooling water inlets 14 through a first pipe 7, a second control valve 5 is provided on the first pipe 7, two three-way valves, namely a first three-way control valve 16 and a second three-way control valve 17, are added in front of the cooling water inlet 14, the cooling water inlet 14 is communicated with a cooling water storage tank at the bottom of an indirect cooling tower 2 and is communicated with the two casing side water discharge ports 15 of the casing 10 after passing through the second control valve 5, the cooling water storage tank at the bottom of the indirect cooling tower 2 is communicated with a steam inlet 22 at the top of the steam inlet chamber 9 through a second three-way control valve 17, a second pipeline 21 and a third control valve 20.
As shown in fig. 1, 6 and 7, the neck 11 includes a steam inlet chamber 9 connected to the top of the casing 10, a square steam exhaust connection pipe 8 fixedly connected to the top of the steam inlet chamber 9, a square fixing plate 80 transitionally connected between the steam inlet chamber 9 and the steam exhaust connection pipe 8, the fixing plate 80 is a metal steel plate with a square through hole 85 in the middle, the top of the steam inlet chamber 9 is welded to the fixing plate 80, and the bottom of the steam exhaust connection pipe 8 is welded to the fixing plate 80. The steam exhaust connecting pipe 8 comprises a square upright pipe 81 fixedly connected by welding and a fixed ring plate 84 positioned at the top of the upright pipe 81, a steam inlet 22 is formed in the middle of the fixed ring plate 84, a plurality of through holes 82 are formed in the pipe wall of the upright pipe 81, all the through holes 82 are distributed at equal intervals, the distance between every two adjacent through holes 82 is 80cm-100cm, and the diameter of each through hole 82 is 15 cm-30 cm. A metal spring piece 83 is fixed on the inner wall surface of the square annular vertical pipe 81, and the metal spring piece 83 is welded and fixed with the inner wall surface of the vertical pipe 81 in a sealing way to seal all the through holes 82. The outer wall surface of the vertical pipe 81 is fixedly provided with a metal buckle 86 corresponding to each through hole 82, all the metal buckles 86 are welded, sealed and fixed with the outer wall surface of the vertical pipe 81, an elastic sleeve 87 is coated outside all the metal buckles 86, the section of the elastic sleeve 87 is semicircular, the elastic sleeve 87 can be made of metal materials or high-temperature-resistant rubber materials, the elastic coefficients of the elastic sleeve 87, the metal buckles 86 and the metal elastic sheet 83 are sequentially reduced, the steam pressure input by the steam turbine can be ensured by utilizing the metal elastic sheet 83 with the minimum elastic coefficient, but when the steam pressure is too large or the condenser equipment is in failure, a buffer force can be provided, even the metal elastic sheet 83 can be flushed, a larger buffer force is provided by virtue of the elasticity of the metal buckles 84 and the elastic sleeve 85, and the safety guarantee of the condenser is further improved.
To ensure that there is no water in the heat exchange tubes and a vacuum state is achieved, a water discharge port 32 is provided at the bottom of the return water chamber 12, and a water discharge port 33 is provided at each of the top of the return water chamber 12 and the top of the cooling water outlet 13, as shown in fig. 2.
Meanwhile, in order to enable the condenser 1 to be in a vacuum state during normal operation and during maintenance and leak detection, an air outlet 18 and a vacuum breaking door port 19 are provided above the return water chamber 12. Naturally, in order to ensure safe operation of the condenser, more inlets and outlets and other additional equipment are needed, but the additional equipment and the inlets and outlets are necessary accessories of the condenser and are mature technologies, and therefore, detailed description is omitted.
And when the condenser normally operates, the third control valve 20 and the second control valve 5 are closed, the first three-way control valve 16 and the second three-way control valve 17 are opened to communicate the cooling water storage tank at the bottom of the indirect cooling tower 2 with the heat exchange pipe in the condenser, and the first control valve 6 is opened to communicate the heat exchange chamber of the condenser with the water inlet pipe of the boiler 3. When the plant is stopped, the steam turbine 4 and the fourth control valve 23 are closed, steam input into the condenser is stopped, and the cooling water inlet 14 is closed at the same time, so that cooling water stops entering the heat exchange pipe.
The condensed water in the heat exchange chamber is discharged through the main condensed water outlet 18, then the first control valve 6 is closed, the heat exchange chamber and the steam inlet chamber 9 of the condenser are in a vacuum state, the water chamber water outlet 32 at the bottom of the return water chamber 12 is opened, the cooling water outlet 13 is closed at the same time, the cooling water in the return water chamber 12 and the heat exchange pipe flows back to the cooling water storage tank at the bottom of the indirect cooling tower 2 through the third pipeline 24 communicated with the cooling water storage tank at the bottom of the indirect cooling tower 2 through the cooling water outlet 13, and the water chamber water outlet 32 is closed, so that the inside of the heat exchange pipe is in a vacuum state.
And then, opening a third control valve 20 and a second three-way control valve 17, communicating a steam inlet 22 with a cooling water storage tank at the bottom of the indirect cooling tower 2, allowing cooling water to enter the shell 10 of the condenser from the steam inlet 22 under the action of a water supply pump 25 until the whole shell 10 of the condenser and the steam inlet chamber 9 are filled, checking the shell wall surface, the heat exchange tube wall surface and all accessory equipment of the condenser after staying for 15-30 hours, marking the position of the leaked water if the leakage of the water is found, and preventing the leakage if the leakage of the water is not found, thereby finishing the overhauling and leakage checking.
And finally, opening a second control valve 5, simultaneously opening a vacuum breaking door interface 19, a cooling water inlet 14, a cooling water outlet 13 and a second three-way control valve 17 at the steam inlet chamber 9, enabling the cooling water in the heat exchange chamber of the condenser and the steam inlet chamber 9 to enter a heat exchange pipe after passing through the second valve 5, and further refluxing the cooling water into a cooling water storage tank at the bottom of the indirect cooling tower 2 through the cooling water outlet 13 to finish the recycling of water for overhauling and leakage detection.
Claims (4)
1. A method for overhauling and checking leakage of a condenser is characterized in that,
the condenser comprises a shell, the bottom of the shell is fixedly connected with the ground through a support, a heat exchange chamber is formed in the shell, a neck connected with a steam outlet of a steam turbine is fixedly connected to the top of the shell to form a steam inlet chamber, a plurality of heat exchange tubes are fixedly mounted in the shell in parallel, one ends of all the heat exchange tubes are communicated with a return water chamber at the tail end of the shell, and the other ends of the heat exchange tubes are communicated with a cooling water outlet and a cooling water inlet at the front end of the shell;
the tail end of the shell is provided with two return water chambers, two groups of cooling water outlets and cooling water inlets are arranged at the front end of the shell, the cooling water outlets and the cooling water inlets of each group are arranged in parallel up and down, and the cooling water outlets and the cooling water inlets of each group respectively correspond to one half of heat exchange tubes in the shell and one return water chamber at the tail end;
a main condensation water outlet communicated with a boiler water inlet pipe is arranged in the middle of the bottom of the shell, and is controlled to open and close by a first control valve;
the bottom of the return water chamber is provided with a water chamber water outlet, and the top of the return water chamber and the top of the cooling water outlet are provided with water chamber air outlets;
when overhauling and leakage checking, discharging condensed water in the heat exchange chamber of the condenser and cooling water in the heat exchange pipe, closing a first control valve, a second control valve, a cooling water outlet, a cooling water inlet and all inlets and outlets of the condenser after the heat exchange chamber and the heat exchange are both in a vacuum state, directly canning the cooling water for cooling in the heat exchange pipe from a steam inlet at the top of the connecting neck until the whole condenser shell and the steam inlet chamber are filled, checking the shell wall surface of the condenser, the heat exchange pipe wall surface and all accessory equipment after staying for 15-30 hours, marking the position of the leaked water if the water is leaked, finishing overhauling and leakage checking if the water is not leaked, opening the second control valve, breaking a vacuum port at the steam inlet chamber, a cooling water inlet and a cooling water outlet, and feeding the cooling water in the heat exchange chamber and the steam inlet chamber of the condenser into the heat exchange pipe through the second valve, and further flows back to a cooling water storage tank at the bottom of the indirect cooling tower through a cooling water outlet to finish the recycling of water for overhauling and checking leakage.
2. The method for overhauling and checking the leakage of the condenser as recited in claim 1, wherein the second control valve is arranged on a first pipeline communicating the shell side water outlet with the cooling water inlet, and two three-way valves, namely a first three-way control valve and a second three-way control valve, are added on a pipeline in front of the cooling water inlet, so that the cooling water inlet is communicated with the cooling water storage tank at the bottom of the indirect cooling tower and is communicated with the two shell side water outlets after passing through the second control valve.
3. The method for overhauling and checking the leakage of the condenser as recited in claim 1, wherein the cooling water storage tank at the bottom of the indirect cooling tower is communicated with the steam inlet at the top of the steam inlet chamber through a second three-way control valve, a second pipeline and a third control valve.
4. A condenser using the method for repairing and leak-checking as claimed in any one of claims 1 to 3, wherein the neck of the condenser comprises a steam inlet chamber connected with the top of the casing, a square steam exhaust connecting pipe fixedly connected with the top of the steam inlet chamber, the steam inlet chamber and the steam exhaust connecting pipe are in transition connection by a square fixing plate, the steam exhaust connecting pipe comprises a square vertical pipe fixedly connected by welding and a fixing ring plate positioned at the top of the square vertical pipe, a plurality of through holes are arranged on the pipe wall of the square vertical pipe, a metal elastic sheet is fixed on the inner wall surface of the square vertical pipe and used for sealing all the through holes, a metal buckle is arranged outside each through hole, and an elastic sleeve is sleeved outside each metal buckle.
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| CN111337195A (en) * | 2020-03-27 | 2020-06-26 | 内蒙古锦联铝材有限公司 | Water injection leakage detection method for vacuum system of air cooling condenser in thermal power plant |
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| GB201117038D0 (en) * | 2011-10-04 | 2011-11-16 | Scan Tech Air Supply Uk Ltd | A well fluid heat exchange system, a control assembly and method thereof |
| CN204574925U (en) * | 2015-04-28 | 2015-08-19 | 黄庆 | A kind of condenser of central air conditioner on-line cleaning system |
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| CN109231616A (en) * | 2018-11-07 | 2019-01-18 | 杭州埃思波环保科技有限公司 | The comprehensive solving device of industry cooling circulating water treatment and method |
| CN109883216A (en) * | 2019-03-07 | 2019-06-14 | 大唐东营发电有限公司 | A kind of horizontal turbine condenser |
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