CN215411820U - Device for shortening yellow smoke emission time of chimney of combined cycle generator set - Google Patents
Device for shortening yellow smoke emission time of chimney of combined cycle generator set Download PDFInfo
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- CN215411820U CN215411820U CN202122045521.7U CN202122045521U CN215411820U CN 215411820 U CN215411820 U CN 215411820U CN 202122045521 U CN202122045521 U CN 202122045521U CN 215411820 U CN215411820 U CN 215411820U
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Abstract
The utility model discloses a device for shortening the yellow smoke emission time of a chimney of a combined cycle generator set, which comprises a steam pressing drum, a preheater, an economizer, a low-pressure evaporator, a medium-pressure evaporator, a high-pressure evaporator, a superheater and the like. The utility model aims at a high, medium and low pressure steam generation system of a waste heat boiler, adopts a method of preheating in advance before the start of a unit, designs an auxiliary steam heating device below a high, medium and low pressure evaporator, and also designs a preheater with a heating function.
Description
Technical Field
The utility model relates to a waste heat boiler system, in particular to a device for shortening yellow smoke emission time of a chimney of a combined cycle generator set.
Background
The pollutants generated in the combustion process of the heavy-duty gas turbine using gas fuels such as natural gas are mainly NOx, in order to reduce NOx emission, a lean-burn premixed combustion technology is generally adopted in the heavy-duty gas turbine in service, but the stability of the lean-burn premixed combustion is poorer than that of diffusion combustion, and the problem of unstable combustion is easily caused when the gas turbine is operated under variable working conditions such as start-up, so that in order to ensure the smooth start-up of a gas turbine generator set, the gas turbine still adopts a staged combustion technology which is dominated by diffusion combustion or diffusion combustion, and after the gas turbine is increased to a certain load, the gas turbine is switched into a lean-burn premixed combustion mode.
Because the gas turbine adopts a diffusion combustion mode in the starting process, the temperature of a diffusion combustion flame surface is usually as high as more than 2000-2200 ℃, and a large amount of NO is generated; meanwhile, the air quantity in the starting stage is far higher than the air quantity required by the theoretical full combustion of fuel, the residual oxygen content in the flue gas after combustion is higher, and higher CO generated due to incomplete combustion caused by low average temperature of the flue gas, unburned hydrocarbon and the like exist, and the factors promote NO to NO2Converting to NO in the flue gas2The concentration is significantly increased. And NO2The smoke is reddish brown gas, and is yellowish brown after being diluted, so that yellow and yellow smoke can be obviously seen in a chimney in the starting process of the gas turbine.
For a gas-steam combined cycle generator set, the starting speed of a waste heat boiler and the warming-up time of a steam turbine are limited, and the starting time of the generator set is generally longer. The starting of the gas-steam combined cycle generator set is generally divided into cold-state starting, warm-state starting and hot-state starting, the cold-state starting time is longest, the hot-state starting time is shortest, and even if the hot-state starting is carried out, the starting time is about 50 min. Although the current national thermal power generation emission regulations do not bring the pollutant emission of the gas turbine startup process into the assessment index, the pollutant emission of the startup process is not ignored.
Disclosure of Invention
The utility model provides a device for shortening yellow smoke emission time of a chimney of a combined cycle generator set, aiming at reducing NOx emission in the starting process of a gas-steam combined cycle generator set and solving the problem of long starting time of a waste heat boiler. The utility model aims at a high, medium and low pressure steam generation system of a waste heat boiler, adopts a method of preheating in advance before the start of a unit, designs an auxiliary steam heating device below a high, medium and low pressure evaporator, and also designs a preheater with a heating function.
The utility model is realized by adopting the following technical scheme:
a device for shortening the yellow smoke emission time of a chimney of a combined cycle generator set comprises a low-pressure steam drum, a medium-pressure steam drum, a high-pressure steam drum, a preheater, a low-pressure economizer, a medium-pressure economizer, a high-pressure economizer, a low-pressure evaporator, a medium-pressure evaporator, a high-pressure evaporator, a low-pressure superheater, a medium-pressure superheater and a high-pressure superheater; wherein,
the preheater is arranged at the foremost end of the waste heat boiler starting system, a water return main pipe, a preheater steam recovery pipe and a preheater condensed water supply pipe are arranged at the top of the preheater, a low-pressure water supply pipe is arranged at the middle upper part of the preheater, and a preheater bubble disperser is arranged at the bottom of the preheater; after the auxiliary steam enters the preheater from the bottom, high-temperature bubbles which uniformly rise are formed by the bubble disperser of the preheater to heat condensed water in the preheater;
the bottom of the low-pressure steam drum is provided with a low-pressure water outlet main pipe which is respectively communicated with the medium-pressure water supply pipe and the high-pressure water supply pipe and is used for conveying water heated in the low-pressure steam drum to the medium-pressure steam drum and the high-pressure steam drum;
the bottom of the medium-pressure steam drum is provided with a medium-pressure steam drum water return pipe which is used for returning water to the medium-pressure steam drum when the waste heat boiler is preheated in advance, and the water returns to the preheater through the medium-pressure steam drum water return pipe when the water level of the medium-pressure steam drum reaches a preset value, so that danger caused by the fact that the medium-pressure steam drum is full of water is prevented;
the bottom of the high-pressure steam drum is provided with a high-pressure steam drum water return pipe which is used for returning water to the high-pressure steam drum when the waste heat boiler is preheated in advance, and when the water level of the high-pressure steam drum reaches a preset value, the water flows back to the preheater through the high-pressure steam drum water return pipe, so that the danger caused by the fact that the high-pressure steam drum is full of water is prevented;
the low-pressure economizer is connected with the low-pressure steam pocket, is arranged at the most downstream position of the exhaust-heat boiler in the smoke flow direction, and heats the condensed water preheated by the preheater by using the heat of the smoke;
the low-pressure evaporator is connected with the low-pressure steam drum and arranged at the upstream of the low-pressure economizer, a low-pressure evaporator preheating steam pipe is arranged at the bottom of the low-pressure evaporator, and when the waste heat boiler is preheated in advance, auxiliary steam heats condensed water in the low-pressure evaporator through the low-pressure evaporator preheating steam pipe;
the low-pressure superheater is connected with the low-pressure steam drum and arranged at the upstream of the low-pressure evaporator, and when the waste heat boiler carries out waste heat in advance, the preheating auxiliary steam in the low-pressure steam drum can be recovered from the low-pressure steam bypass through the low-pressure superheater;
the medium-pressure economizer is connected with the medium-pressure steam pocket, is arranged at the upstream of the low-pressure superheater of the waste heat boiler and is used for heating low-pressure steam pocket water which is shunted by a medium-pressure water supply pipe from a low-pressure water outlet main pipe;
the middle-pressure evaporator is connected with the middle-pressure steam drum and arranged at the upstream of the middle-pressure economizer, a middle-pressure evaporator preheating steam pipe is arranged at the bottom of the middle-pressure evaporator, and when the waste heat boiler is preheated in advance, auxiliary steam is used for heating condensed water in the middle-pressure evaporator through the middle-pressure evaporator preheating steam pipe;
the intermediate-pressure superheater is connected with the intermediate-pressure steam drum and arranged at the upstream of the intermediate-pressure evaporator, and when the waste heat boiler carries out waste heat in advance, the preheating auxiliary steam in the intermediate-pressure steam drum can be recovered from the intermediate-pressure steam bypass through the intermediate-pressure superheater;
the high-pressure economizer is connected with the high-pressure steam pocket, is arranged at the upstream of the intermediate-pressure superheater of the waste heat boiler and is used for heating low-pressure steam pocket water shunted by the high-pressure water supply pipe from the low-pressure water outlet main pipe;
the high-pressure evaporator is connected with the high-pressure steam drum and arranged at the upstream of the high-pressure economizer, a high-pressure evaporator preheating steam pipe is arranged at the bottom of the high-pressure evaporator, and when the waste heat boiler is preheated in advance, auxiliary steam is used for heating condensed water in the high-pressure evaporator through the high-pressure evaporator preheating steam pipe;
the high-pressure superheater is connected with the high-pressure steam drum and arranged at the upstream of the high-pressure evaporator, and when the waste heat boiler carries out waste heat in advance, the preheating auxiliary steam in the high-pressure steam drum can be recovered from the high-pressure steam bypass through the high-pressure superheater.
The utility model is further improved in that the preheater is in the shape of a standing cylindrical tank structure.
In a further improvement of the utility model, the preheater bubble disperser has a hollow circular sandwich structure.
The utility model is further improved in that a plurality of steam injection holes are uniformly arranged on the upper layer circular plate.
The utility model is further improved in that a preheater blow-off pipe and a preheater auxiliary steam pipe are also arranged at the bottom of the preheater.
The utility model is further improved in that the auxiliary steam pipe of the preheater is provided with an auxiliary steam regulating valve of the preheater.
The utility model is further improved in that the low-pressure evaporator preheating steam pipe is provided with a low-pressure evaporator preheating steam regulating valve.
The utility model is further improved in that the medium-pressure evaporator preheating steam pipe is provided with a medium-pressure evaporator preheating steam regulating valve.
The utility model is further improved in that the high-pressure evaporator preheating steam pipe is provided with a high-pressure evaporator preheating steam regulating valve.
The utility model is further improved in that the steam recovery pipe of the preheater is provided with a steam recovery control valve of the preheater.
The utility model has at least the following beneficial technical effects:
the utility model provides a device for shortening the time of yellow smoke emission of a chimney of a combined cycle generator set, which adopts a method of preheating condensate water of a waste heat boiler before starting the generator set, wherein an auxiliary steam heating device is designed below high, medium and low pressure evaporators of the waste heat boiler, the auxiliary steam is used for heating the condensate water in the high, medium and low pressure evaporators of the waste heat boiler in advance, and the evaporation time of the condensate water after high-temperature smoke of a gas turbine is discharged into the waste heat boiler is shortened; meanwhile, as the preheater with the heating function is designed outside the boiler, auxiliary steam can be used for heating condensed water in a high-pressure economizer, a medium-pressure economizer and a low-pressure economizer of the waste heat boiler and a steam pocket in the preheater, so that the waste heat boiler can be quickly started, the starting time of the gas-steam combined cycle generator set is shortened, and the advantage of reducing the pollutant discharge amount in the starting process is achieved; meanwhile, the starting time is shortened, the steam turbine can perform impulse heating machine synchronization power generation earlier, and the economic benefit of the unit is improved.
Drawings
FIG. 1 is a schematic diagram of an apparatus for reducing yellow smoke emission time of a combined cycle power plant stack according to the present invention.
FIG. 2 is a schematic diagram of a preheater according to the present invention.
Description of reference numerals:
1. a low pressure steam drum; 2. a medium pressure steam drum; 3. a high pressure steam drum; 4. a low pressure feed pump; 5. a low-pressure economizer; 6. a low pressure evaporator; 7. a low pressure superheater; 8. a medium pressure feed pump; 9. a medium-pressure economizer; 10. a medium pressure evaporator; 11. a medium pressure superheater; 12. a high pressure feed pump; 13. a high-pressure economizer; 14. a high pressure evaporator; 15. a high pressure superheater; 16. a preheater; 17. a low pressure drum relief valve; 18. a low-pressure steam pocket pressure relief pipe; 19. a low-pressure water outlet main pipe; 20. a low pressure feed pipe; 21. a preheater auxiliary steam pipe; 22. a preheater auxiliary steam regulating valve; 23. a pre-heater blow-off pipe; 24. a preheater blowdown control valve; 25. preheating a steam pipe by a low-pressure evaporator; 26. the low-pressure evaporator preheats the steam regulating valve; 27. a blowdown control valve of the low-pressure evaporator; 28. a drain pipe of the low-pressure evaporator; 29. a low pressure steam main; 30. a low pressure drum downcomer; 31. a low-pressure steam pocket descending water control valve; 32. a medium pressure drum relief valve; 33. a medium-pressure steam pocket pressure relief pipe; 34. a backwater main pipe; 35. a medium-pressure steam drum return water regulating valve; 36. a medium-pressure steam drum water return pipe; 37. a medium pressure water supply pipe; 38. the medium-pressure evaporator preheats the steam pipe; 39. the medium-pressure evaporator preheats the steam regulating valve; 40. a medium pressure evaporator blowdown control valve; 41. a drain pipe of the medium-pressure evaporator; 42. a medium pressure steam main; 43. a medium pressure drum downcomer; 44. a medium-pressure steam drum descending water control valve; 45. a high pressure drum relief valve; 46. a high-pressure steam pocket pressure relief pipe; 47. a high-pressure steam drum backwater regulating valve; 48. a high-pressure steam drum water return pipe; 49. a high pressure feed pipe; 50. preheating a steam pipe by a high-pressure evaporator; 51. the high-pressure evaporator preheats the steam regulating valve; 52. a blowdown control valve of the high-pressure evaporator; 53. a drain pipe of the high-pressure evaporator; 54. a high pressure steam main pipe; 55. a high pressure drum downcomer; 56. a high-pressure steam drum descending water control valve; 57. a preheater vapor recovery control valve; 58. a preheater steam recovery tube; 59. a low pressure steam bypass regulating valve; 60. a low pressure steam bypass; 61. a low pressure steam main path regulating valve; 62. a medium pressure steam bypass regulating valve; 63. a medium pressure steam bypass; 64. a medium pressure steam main path regulating valve; 65. a high pressure steam bypass regulating valve; 66. a high pressure steam bypass; 67. a high pressure steam main path regulating valve; 68. a preheater condensed water supply pipe; 69. a preheater condensate pump; 70. a preheater bubble disperser.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Referring to fig. 1 and 2, the device for shortening the yellow smoke emission time of the chimney of the combined cycle generator set provided by the utility model mainly comprises a low-pressure steam drum 1, a medium-pressure steam drum 2, a high-pressure steam drum 3, a preheater 16, a low-pressure economizer 5, a medium-pressure economizer 9, a high-pressure economizer 13, a low-pressure evaporator 6, a medium-pressure evaporator 10, a high-pressure evaporator 14, a low-pressure superheater 7, a medium-pressure superheater 11, a high-pressure superheater 15 and the like. The low-pressure steam pocket 1, the low-pressure economizer 5, the medium-pressure economizer 9, the high-pressure economizer 13, the low-pressure superheater 7, the medium-pressure superheater 11, the high-pressure superheater 15 and the like are the same as those of the traditional preheating boiler.
Referring to fig. 1, the preheating system in this embodiment mainly includes a preheater 16, a preheater auxiliary steam pipe 21, a preheater auxiliary steam regulating valve 22, a preheater sewage discharge pipe 23, a preheater sewage discharge control valve 24, a low-pressure evaporator preheating steam pipe 25, a low-pressure evaporator preheating steam regulating valve 26, a return water main pipe 34, a medium-pressure drum return water regulating valve 35, a medium-pressure drum return water pipe 36, a medium-pressure evaporator preheating steam pipe 38, a medium-pressure evaporator preheating steam regulating valve 39, a high-pressure drum return water regulating valve 47, a high-pressure drum return water pipe 48, a high-pressure evaporator preheating steam pipe 50, a high-pressure evaporator preheating steam regulating valve 51, a preheater steam recovery control valve 57, a preheater steam recovery pipe 58, a preheater condensed water supply pipe 68, and a preheater condensed water pump 69. The preheater 16 is arranged at the foremost end of the waste heat boiler starting system, a water return main pipe 34, a preheater steam recovery pipe 58 and a preheater condensed water supply pipe 68 are arranged at the top of the preheater 16, a low-pressure water supply pipe 20 is arranged at the middle upper part of the preheater 16, and a preheater blow-off pipe 23, a preheater auxiliary steam pipe 21 and a preheater bubble disperser 70 are arranged at the bottom of the preheater 16; after entering the preheater 16 from the bottom, the auxiliary steam is formed into uniformly rising high-temperature bubbles by the preheater bubble disperser 70 to heat the condensed water in the preheater 16.
The low-pressure steam system in the embodiment mainly comprises a low-pressure steam drum 1, a low-pressure water feed pump 4, a low-pressure economizer 5, a low-pressure evaporator 6, a low-pressure superheater 7, a low-pressure steam drum pressure release valve 17, a low-pressure steam drum pressure release pipe 18, a low-pressure water outlet main pipe 19, a low-pressure water feed pipe 20, a low-pressure evaporator pollution discharge control valve 27, a low-pressure evaporator pollution discharge pipe 28, a low-pressure steam main pipe 29, a low-pressure steam drum descending pipe 30, a low-pressure steam drum descending water control valve 31, a low-pressure steam bypass adjusting valve 59, a low-pressure steam bypass 60 and a low-pressure steam main path adjusting valve 61. The low-pressure economizer 5 is connected with the low-pressure steam pocket 1, is arranged at the most downstream of the exhaust-heat boiler in the flue gas flow direction, and heats condensed water preheated by the preheater 16 by utilizing the heat of the flue gas; the low-pressure evaporator 6 is connected with the low-pressure steam pocket 1, the low-pressure evaporator 6 is arranged at the upstream of the low-pressure economizer 5, a low-pressure evaporator preheating steam pipe 25 is arranged at the bottom of the low-pressure evaporator 6, and when the waste heat boiler is preheated in advance, auxiliary steam heats condensed water in the low-pressure evaporator 6 through the low-pressure evaporator preheating steam pipe 25; the low-pressure superheater 7 is connected with the low-pressure steam drum 1 and arranged at the upstream of the low-pressure evaporator 6, and when the waste heat boiler carries out waste heat in advance, the preheating auxiliary steam in the low-pressure steam drum 1 can be recovered from the low-pressure steam bypass 60 through the low-pressure superheater 7.
The medium-pressure steam system in the embodiment mainly comprises a medium-pressure steam drum 2, a medium-pressure water feed pump 8, a medium-pressure economizer 9, a medium-pressure evaporator 10, a medium-pressure superheater 11, a medium-pressure steam drum pressure release valve 32, a medium-pressure steam drum pressure release pipe 33, a medium-pressure water feed pipe 37, a medium-pressure evaporator blowdown control valve 40, a medium-pressure evaporator blowdown pipe 41, a medium-pressure steam main pipe 42, a medium-pressure steam drum descending pipe 43, a medium-pressure steam drum descending water control valve 44, a medium-pressure steam bypass adjusting valve 62, a medium-pressure steam bypass 63 and a medium-pressure steam main pipe adjusting valve 64. The medium-pressure economizer 9 is connected with the medium-pressure steam pocket 2, is arranged at the upstream of the low-pressure superheater 7 of the waste heat boiler and is used for heating low-pressure steam pocket water which is branched from the low-pressure water outlet main pipe 19 by a medium-pressure water supply pipe 37; the medium-pressure evaporator 10 is connected with the medium-pressure steam drum 2, the medium-pressure evaporator 10 is arranged upstream of the medium-pressure economizer 9, a medium-pressure evaporator preheating steam pipe 38 is arranged at the bottom of the medium-pressure evaporator 10, and when the waste heat boiler is preheated in advance, auxiliary steam heats condensed water in the medium-pressure evaporator 10 through the medium-pressure evaporator preheating steam pipe 38; the medium-pressure superheater 11 is connected with the medium-pressure steam drum 2, the medium-pressure superheater 11 is arranged at the upstream of the medium-pressure evaporator 10, and when the waste heat boiler carries out waste heat in advance, the preheating auxiliary steam in the medium-pressure steam drum 2 can be recovered from the medium-pressure steam bypass 63 through the medium-pressure superheater 11.
The high-pressure steam system in the embodiment mainly comprises a high-pressure steam drum 3, a high-pressure water feed pump 12, a high-pressure economizer 13, a high-pressure evaporator 14, a high-pressure superheater 15, a high-pressure steam drum pressure release valve 45, a high-pressure steam drum pressure release pipe 46, a high-pressure water feed pipe 49, a high-pressure evaporator blowdown control valve 52, a high-pressure evaporator blowdown pipe 53, a high-pressure steam main pipe 54, a high-pressure steam drum downcomer pipe 55, a high-pressure steam drum downcomer control valve 56, a high-pressure steam bypass adjusting valve 65, a high-pressure steam bypass 66 and a high-pressure steam main path adjusting valve 67. The high-pressure economizer 13 is connected with the high-pressure steam pocket 3, is arranged at the upstream of the intermediate-pressure superheater 11 of the waste heat boiler and is used for heating low-pressure steam pocket water which is branched by a high-pressure water supply pipe 49 from a low-pressure water outlet main pipe 19; the high-pressure evaporator 14 is connected with the high-pressure steam drum 3, the high-pressure evaporator 14 is arranged at the upstream of the high-pressure economizer 13, a high-pressure evaporator preheating steam pipe 50 is arranged at the bottom of the high-pressure evaporator 14, and when the waste heat boiler is preheated in advance, auxiliary steam heats condensed water in the high-pressure evaporator 14 through the high-pressure evaporator preheating steam pipe 50; the high-pressure superheater 15 is connected with the high-pressure steam drum 3 and arranged at the upstream of the high-pressure evaporator 14, and when the waste heat boiler carries out waste heat in advance, preheating auxiliary steam in the high-pressure steam drum 3 can be recovered from the high-pressure steam bypass 66 through the high-pressure superheater 15.
Referring to FIG. 2, a preheater bubble disperser 70 is provided at the bottom of the preheater 16.
The specific working mode of the device for shortening the yellow smoke emission time of the chimney of the combined cycle generator set is as follows:
when the start-up system of the waste heat boiler works, the preheater blow-down control valve 24, the low-pressure evaporator blow-down control valve 27, the low-pressure drum down water control valve 31, the medium-pressure evaporator blow-down control valve 40, the medium-pressure drum down water control valve 44, the high-pressure evaporator blow-down control valve 52, the high-pressure drum down water control valve 56, the low-pressure steam main path regulating valve 61, the medium-pressure steam main path regulating valve 64 and the high-pressure steam main path regulating valve 67 are closed, the preheater auxiliary steam regulating valve 22, the low-pressure evaporator preheating steam regulating valve 26, the medium-pressure drum back water regulating valve 35, the medium-pressure evaporator preheating steam regulating valve 39, the high-pressure drum back water regulating valve 47, the high-pressure evaporator preheating steam regulating valve 51, the preheater steam recovery control valve 57, the low-pressure steam bypass regulating valve 59, the medium-pressure steam bypass regulating valve 62 and the high-pressure steam bypass regulating valve 65 are opened, the preheater condensate pump 69 is started, condensed water enters the preheater 16 from the top of the preheater 16 through a preheater condensed water supply pipe 68, meanwhile, auxiliary steam forms uniform high-temperature bubbles through a preheater auxiliary steam pipe 21 from the bottom of the preheater 16 through a preheater bubble disperser 70, the uniform high-temperature bubbles are directly contacted with the condensed water in the preheater 16 to generate heat exchange, and exhaust steam after heat exchange returns to an auxiliary steam generation system from a preheater steam recovery pipe 58 at the head of the preheater 16; the water at the bottom of the preheater 16 is first contacted with the auxiliary steam bubbles, so that the water temperature is higher, the density is lower, a natural upward lifting force is formed, the condensate water entering the preheater 16 from the return water main pipe 34 and the preheater condensate water supply pipe 68 has lower water temperature and higher density, and is naturally dropped to the bottom of the preheater 16, and thus, the water circulation in the preheater 16 is heated by the auxiliary steam.
The condensed water heated in the preheater 16 enters the low-pressure economizer 5 through the low-pressure water supply pipe 20 under the suction action of the low-pressure water supply pump 4, exchanges heat with the original condensed water in the low-pressure economizer 5, and then enters the low-pressure steam pocket 1 to heat the original condensed water in the low-pressure steam pocket 1; the condensed water in the low-pressure steam pocket flows into the low-pressure water outlet main pipe 19 simultaneously in the heating process, enters the medium-pressure economizer 9 through the medium-pressure water supply pipe 37 under the suction action of the medium-pressure water supply pump 8, exchanges heat with the original condensed water in the medium-pressure economizer 9, then enters the medium-pressure steam pocket 2, and heats the original condensed water in the medium-pressure steam pocket 2; under the pumping action of the high-pressure water feeding pump 12, the condensed water enters the high-pressure economizer 13 through the high-pressure water feeding pipe 49, exchanges heat with the original condensed water in the high-pressure economizer 13, and then enters the high-pressure steam pocket 3 to heat the original condensed water in the high-pressure steam pocket 3; meanwhile, the condensed water in the medium-pressure steam drum 2 and the high-pressure steam drum 3 respectively flows into the water return main pipe 34 through the medium-pressure steam drum water return pipe 36 and the high-pressure steam drum water return pipe 48 in the heating process, and finally enters the preheater 16 from the top of the preheater 16 to be reheated.
The condensed water in the preheater 16, the low-pressure economizer 5, the medium-pressure economizer 9, the high-pressure economizer 13, the low-pressure steam pocket 1, the medium-pressure steam pocket 2 and the high-pressure steam pocket 3 is heated by auxiliary steam, meanwhile, the auxiliary steam enters the low-pressure evaporator 6, the medium-pressure evaporator 10 and the high-pressure evaporator 14 through the low-pressure evaporator preheating steam pipe 25, the medium-pressure evaporator preheating steam pipe 38 and the high-pressure evaporator preheating steam pipe 50 respectively to heat the original condensed water in the evaporators, the exhaust steam after heat exchange enters the low-pressure steam pocket 1, the medium-pressure steam pocket 2 and the high-pressure steam pocket 3 respectively to further heat the condensed water in the steam pockets, and finally returns to the auxiliary steam generation system through the low-pressure steam bypass 60, the medium-pressure steam bypass 63 and the high-pressure steam bypass 66 respectively to be heated, so as to form new high-temperature auxiliary steam for the waste heat boiler starting system.
When the condensed water in the waste heat boiler is heated to the required temperature, the gas turbine is started, the auxiliary steam regulating valve 22 of the preheater, the preheating steam regulating valve 26 of the low-pressure evaporator, the middle-pressure drum backwater regulating valve 35, the preheating steam regulating valve 39 of the middle-pressure evaporator, the high-pressure drum backwater regulating valve 47, the preheating steam regulating valve 51 of the high-pressure evaporator and the steam recovery control valve 57 of the preheater are closed, the low-pressure drum descent control valve 31, the middle-pressure drum descent control valve 44 and the high-pressure drum descent control valve 56 are opened, the high-temperature flue gas after the gas turbine burns and expands to do work is discharged into the waste heat boiler, the high-pressure superheater 15, the middle-pressure superheater 11, the low-pressure superheater 7, the high-pressure evaporator 14, the middle-pressure evaporator 10, the low-pressure evaporator 6, the high-pressure economizer 13, the middle-pressure economizer 9 and the condensed water in the low-pressure economizer 5 are heated to quickly generate high-temperature and high-pressure steam, after the steam indexes meet the requirements, the low-pressure steam main path regulating valve 61, the medium-pressure steam main path regulating valve 64 and the high-pressure steam main path regulating valve 67 are opened, meanwhile, the low-pressure steam bypass regulating valve 59, the medium-pressure steam bypass regulating valve 62 and the high-pressure steam bypass regulating valve 65 are closed, steam generated by the waste heat boiler quickly enters a steam turbine impulse-to-steam heating machine, the starting time of the gas-steam combined cycle generator set is shortened, and the emission amount of pollutants such as NOx in the starting process is reduced.
The foregoing shows and describes the general principles, essential features, and advantages of the utility model. The present invention is not limited to the above-described embodiments, which are described in the specification and illustrated only for illustrating the principle of the present invention, but various changes and modifications may be made within the scope of the present invention as claimed without departing from the spirit and scope of the present invention.
Claims (10)
1. A device for shortening the yellow smoke emission time of a chimney of a combined cycle generator set is characterized by comprising a low-pressure steam drum, a medium-pressure steam drum, a high-pressure steam drum, a preheater, a low-pressure economizer, a medium-pressure economizer, a high-pressure economizer, a low-pressure evaporator, a medium-pressure evaporator, a high-pressure evaporator, a low-pressure superheater, a medium-pressure superheater and a high-pressure superheater; wherein,
the preheater is arranged at the foremost end of the waste heat boiler starting system, a water return main pipe, a preheater steam recovery pipe and a preheater condensed water supply pipe are arranged at the top of the preheater, a low-pressure water supply pipe is arranged at the middle upper part of the preheater, and a preheater bubble disperser is arranged at the bottom of the preheater; after the auxiliary steam enters the preheater from the bottom, high-temperature bubbles which uniformly rise are formed by the bubble disperser of the preheater to heat condensed water in the preheater;
the bottom of the low-pressure steam drum is provided with a low-pressure water outlet main pipe which is respectively communicated with the medium-pressure water supply pipe and the high-pressure water supply pipe and is used for conveying water heated in the low-pressure steam drum to the medium-pressure steam drum and the high-pressure steam drum;
the bottom of the medium-pressure steam drum is provided with a medium-pressure steam drum water return pipe which is used for returning water to the medium-pressure steam drum when the waste heat boiler is preheated in advance, and the water returns to the preheater through the medium-pressure steam drum water return pipe when the water level of the medium-pressure steam drum reaches a preset value, so that danger caused by the fact that the medium-pressure steam drum is full of water is prevented;
the bottom of the high-pressure steam drum is provided with a high-pressure steam drum water return pipe which is used for returning water to the high-pressure steam drum when the waste heat boiler is preheated in advance, and when the water level of the high-pressure steam drum reaches a preset value, the water flows back to the preheater through the high-pressure steam drum water return pipe, so that the danger caused by the fact that the high-pressure steam drum is full of water is prevented;
the low-pressure economizer is connected with the low-pressure steam pocket, is arranged at the most downstream position of the exhaust-heat boiler in the smoke flow direction, and heats the condensed water preheated by the preheater by using the heat of the smoke;
the low-pressure evaporator is connected with the low-pressure steam drum and arranged at the upstream of the low-pressure economizer, a low-pressure evaporator preheating steam pipe is arranged at the bottom of the low-pressure evaporator, and when the waste heat boiler is preheated in advance, auxiliary steam heats condensed water in the low-pressure evaporator through the low-pressure evaporator preheating steam pipe;
the low-pressure superheater is connected with the low-pressure steam drum and arranged at the upstream of the low-pressure evaporator, and when the waste heat boiler carries out waste heat in advance, the preheating auxiliary steam in the low-pressure steam drum can be recovered from the low-pressure steam bypass through the low-pressure superheater;
the medium-pressure economizer is connected with the medium-pressure steam pocket, is arranged at the upstream of the low-pressure superheater of the waste heat boiler and is used for heating low-pressure steam pocket water which is shunted by a medium-pressure water supply pipe from a low-pressure water outlet main pipe;
the middle-pressure evaporator is connected with the middle-pressure steam drum and arranged at the upstream of the middle-pressure economizer, a middle-pressure evaporator preheating steam pipe is arranged at the bottom of the middle-pressure evaporator, and when the waste heat boiler is preheated in advance, auxiliary steam is used for heating condensed water in the middle-pressure evaporator through the middle-pressure evaporator preheating steam pipe;
the intermediate-pressure superheater is connected with the intermediate-pressure steam drum and arranged at the upstream of the intermediate-pressure evaporator, and when the waste heat boiler carries out waste heat in advance, the preheating auxiliary steam in the intermediate-pressure steam drum can be recovered from the intermediate-pressure steam bypass through the intermediate-pressure superheater;
the high-pressure economizer is connected with the high-pressure steam pocket, is arranged at the upstream of the intermediate-pressure superheater of the waste heat boiler and is used for heating low-pressure steam pocket water shunted by the high-pressure water supply pipe from the low-pressure water outlet main pipe;
the high-pressure evaporator is connected with the high-pressure steam drum and arranged at the upstream of the high-pressure economizer, a high-pressure evaporator preheating steam pipe is arranged at the bottom of the high-pressure evaporator, and when the waste heat boiler is preheated in advance, auxiliary steam is used for heating condensed water in the high-pressure evaporator through the high-pressure evaporator preheating steam pipe;
the high-pressure superheater is connected with the high-pressure steam drum and arranged at the upstream of the high-pressure evaporator, and when the waste heat boiler carries out waste heat in advance, the preheating auxiliary steam in the high-pressure steam drum can be recovered from the high-pressure steam bypass through the high-pressure superheater.
2. The apparatus of claim 1, wherein the preheater is in the form of a tree cylindrical canister.
3. The apparatus of claim 1, wherein the preheater bubble disperser has a hollow circular sandwich configuration.
4. The apparatus of claim 1, wherein the upper circular plate has a plurality of steam injection holes formed therein.
5. The device for shortening the yellow smoke emission time of the chimney of the combined cycle generator set according to claim 1, wherein a preheater blow-off pipe and a preheater auxiliary steam pipe are further arranged at the bottom of the preheater.
6. The device for shortening the yellow smoke emission time of the chimney of the combined cycle generator set according to claim 5, wherein a preheater auxiliary steam adjusting valve is arranged on the preheater auxiliary steam pipe.
7. The device for shortening the yellow smoke emission time of the chimney of the combined cycle generator set according to claim 1, wherein the low-pressure evaporator preheating steam pipe is provided with a low-pressure evaporator preheating steam regulating valve.
8. The device for shortening the yellow smoke emission time of the chimney of the combined cycle generator set according to claim 1, wherein the medium-pressure evaporator preheating steam pipe is provided with a medium-pressure evaporator preheating steam regulating valve.
9. The device for shortening the yellow smoke emission time of the chimney of the combined cycle generator set according to claim 1, wherein the high-pressure evaporator preheating steam pipe is provided with a high-pressure evaporator preheating steam regulating valve.
10. The apparatus of claim 1, wherein the preheater vapor recovery tube is provided with a preheater vapor recovery control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122045521.7U CN215411820U (en) | 2021-08-27 | 2021-08-27 | Device for shortening yellow smoke emission time of chimney of combined cycle generator set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122045521.7U CN215411820U (en) | 2021-08-27 | 2021-08-27 | Device for shortening yellow smoke emission time of chimney of combined cycle generator set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215411820U true CN215411820U (en) | 2022-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122045521.7U Active CN215411820U (en) | 2021-08-27 | 2021-08-27 | Device for shortening yellow smoke emission time of chimney of combined cycle generator set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215411820U (en) |
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2021
- 2021-08-27 CN CN202122045521.7U patent/CN215411820U/en active Active
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