CN202692021U - Integrated device for graded preheating of air and condensed water of steam turbine by flue gas of boiler - Google Patents
Integrated device for graded preheating of air and condensed water of steam turbine by flue gas of boiler Download PDFInfo
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- CN202692021U CN202692021U CN 201220305182 CN201220305182U CN202692021U CN 202692021 U CN202692021 U CN 202692021U CN 201220305182 CN201220305182 CN 201220305182 CN 201220305182 U CN201220305182 U CN 201220305182U CN 202692021 U CN202692021 U CN 202692021U
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Abstract
The utility model discloses an integrated device for graded preheating of air and condensed water of a steam turbine by flue gas of a boiler. The integrated device is characterized in that the flue gas with the temperature of about 300-400 DEG C at the tail part of the boiler enters a conventional rotary air preheater, two flue-gas condensed water heaters and a front air preheater respectively, and is exhausted out of the system when the temperature is reduced to 60-100 DEG C, so that the flue gas with different temperature grades can be reasonably utilized. Simultaneously, the utility model provides a flexible low-pressure heat-return heating system of condensed water of the steam turbine by an ingenious pipeline and valve design, so that the flexible pumping of the condensed water in the flue-gas and condensed-water heater from a plurality of positions can be realized, the better application of waste heat of the flue gas under various working conditions can be ensured, and further the condition that the flue-gas waste heat utilization system at the tail part of the boiler of a whole power station is in optimal waste-heat recovery state under various working conditions and at the air side and the condensed-water side respectively can be ensured.
Description
Technical field
The utility model belongs to the energy savings apparatus field of utilizing waste heat, be particularly related to the integrating device of a kind of residual heat from boiler fume classification preheated air and steam turbine condensate water, be to utilize the air preheater classification to add the classification UTILIZATION OF VESIDUAL HEAT IN that hot-air and fume gas condensation water heater classification heat-setting water are finished flue gas specifically, reduce the unit coal consumption.
Background technology
The energy-saving and emission-reduction of large electric power plant unit are the important state basic policies of China.In China, the coal-burning power plant has consumed the national closely coal production of half, along with rising steadily of Coal Energy Source price in recent years, day by day increase take the cost of electricity-generating of coal as the basis, each thermal power plant is faced with huge economizer pressure, constantly seek to reduce the new technology of coal consumption, the application of energy savings aspect, and strengthen relevant fund input.
For the consideration of avoiding the back-end surfaces acid dew piont corrosion, exhaust gas temperature is generally about 120～130 ℃ in the thermal power plant; Use the boiler of high-sulfur combustor, exhaust gas temperature is brought up to about 150 ℃; Install the boiler of steam air heater additional, exhaust gas temperature can reach 150～180 ℃, and the exhaust gas temperature of individual boilers is more up to more than 180 ℃.Exhaust gas temperature is too high directly to cause in the flue gas appreciable energy without just utilizing directly discharged to atmosphere.Aspect the environment protection desulphurization requirement, in the smoke limestone wet desulfurizing process that most thermal power plant adopts, best desulfurization temperature is about 50 ℃, exhaust gas temperature is reduced to about 50 ℃ in desulfurizing tower by the spray mode, not only consume a large amount of water and the energy, and increased smoke discharge amount.Therefore, consider from energy-saving and emission-reduction and economy two aspects, further reduce the inevitable choice that exhaust gas temperature becomes present station boiler development energy-conserving and emission-cutting technology.
The prospect that the UTILIZATION OF VESIDUAL HEAT IN technology is used is extensive.Abroad, the equipment that reduces the afterbody exhaust gas temperature and reclaimed heat has obtained application more for a long time.In the ultra supercritical power generation unit that gets up for immediate development, Cologne, Germany Nideraussem 1000MW level brown coal generating set is installed at waste heat exchange device in the bypass flue of air preheater, adopt the separation flue system fully to reduce exhaust gas temperature, introduce simultaneously partial fume to the interior heating boiler feedwater of by-pass flue.The Germany Schwarze Pumpe 2 * 800MW of power plant brown coal generating set has installed gas cooler additional after electrostatic precipitator, utilize fume afterheat to come the heating boiler feedwater.In China, Waigaoqiao of Shaihai power plant just is applied to back and forth ending section fume afterheat of afterheat heat exchanger in three phases enlarging million kilowatt ultra supercritical unit engineering project.
What be fit at present the boiler tail flue gas UTILIZATION OF VESIDUAL HEAT IN all is to consider that directly because the air preheater exhaust gas temperature is about 120-140 ℃, its temperature is utilized limited space with air preheater exit low-temperature flue gas heat-setting water, and form is single.Do not consider from system perspective, energy utilization relation between flue gas, air, the condensate water three, in the present invention, flue gas, air and condensate water form the level Four heating system, consider condensate water and air with the flue gas different temperatures grade of different temperatures grade.And considered that under different load the flexible connected mode of flue gas heat-exchange unit and bleeder heater guarantees that whole Rear of Utility Boiler smoke waste heat utilization system is under various working, all be in best waste heat recovery state in air side and condensate water side.
The utility model content
The purpose of this utility model is the integrating device that proposes a kind of boiler smoke classification preheated air and steam turbine condensate water for fired power generating unit in the deficiency of deep exploitation smoke discharging residual heat, it is characterized in that this device is comprised of two-stage fume gas condensation water heater and two-stage air preheater; On the smoke discharging pipe of boiler 1, be in series with successively conventional rotary regenerative air preheater 2, one-level fume gas condensation water heater 3, deduster 4, secondary smoke condensation water heater 5, forward type low-temperature air preheater 6 and air-introduced machine 7; Steam turbine high-pressure cylinder 8, Steam Turbine Through IP Admission 9 and turbine low pressure cylinder 10 are connected step by step, deliver to high pressure back heating system 11 by oxygen-eliminating device 16 and feed pump feedwater; The low pressure heat regenerative system 12 that is comprised of 5# low-pressure heater, 6# low-pressure heater, 7# low-pressure heater and 8# low-pressure heater is in series or is connected in parallel by valve and one-level fume gas condensation water heater 3 and secondary condensation water heater 5.
Described one-level fume gas condensation water heater 3 be connected on by booster pump 13 and 5#-6# low-pressure heater or 6#-7# low-pressure heater between or be connected in parallel on 7# or 8# low-pressure heater two ends.
Described secondary smoke condensation water heater 5 by booster pump 14 both can be respectively with the 7# low-pressure heater, the 8# low-pressure heater is in parallel or double-bank heater to stride level in parallel; Perhaps be connected between the 6#-7# low-pressure heater or between the 7#-8# low-pressure heater.
The regenerative steam of described Steam Turbine Through IP Admission 9 and turbine low pressure cylinder 10 adds the condensate water in the heat low heat regenerative system 12.
The beneficial effects of the utility model are to overlap flexibly steam turbine condensate water low pressure back heating system by cleverly pipeline and valve design, formation one.Native system can be realized being arranged in parallel of one-level fume gas condensation water heater and low-pressure heater, or arranged in series; Or realize the in parallel or stride a grade parallel connection respectively of secondary smoke condensation water heater and low-pressure heater.Under different load, according to the different grade working medium of different energy level flue gas, squeeze steam turbine different pressures grade and draw gas, in the constant situation of main steam flow, increase to greatest extent the steam turbine power output, improve power plant efficiency, reduce the unit coal consumption.
Description of drawings
Fig. 1 is the integrating device schematic diagram that the residual heat from boiler fume classification adds hot-air and steam turbine condensate water.
The specific embodiment
The utility model provides the integrating device that proposes a kind of residual heat from boiler fume classification preheated air and steam turbine condensate water.Be explained below in conjunction with drawings and Examples.
Figure 1 shows that the residual heat from boiler fume classification adds the integrating device schematic diagram of hot-air and steam turbine condensate water.Among the figure, integrating device is comprised of two-stage fume gas condensation water heater and two-stage air preheater; On the smoke discharging pipe of boiler 1, be in series with successively conventional rotary regenerative air preheater 2, one-level fume gas condensation water heater 3, deduster 4, secondary smoke condensation water heater 5, forward type low-temperature air preheater 6 and air-introduced machine 7; Steam turbine high-pressure cylinder 8, Steam Turbine Through IP Admission 9 and turbine low pressure cylinder 10 are connected step by step; Deliver to high pressure back heating system 11 by oxygen-eliminating device 16 and feed pump feedwater; The regenerative steam of Steam Turbine Through IP Admission 9 and turbine low pressure cylinder 10 heats the condensate water in the low pressure back heating system 12 that is comprised of 5# low-pressure heater, 6# low-pressure heater, 7# low-pressure heater and 8# low-pressure heater, and low pressure back heating system 12 joins by valve and the solidifying one-level fume gas condensation water heater 3 of two-stage and secondary smoke condensation water heater 5 serial or parallel connections.Wherein, one-level fume gas condensation water heater 3 not only can be connected on by the 13rd booster pump and 5#-6# low-pressure heater or 6#-7# low-pressure heater between, but also the 7# that can be connected in parallel, 8# low-pressure heater two ends.Secondary smoke condensation water heater 5 by the 14th booster pump not only can be respectively with the 7# low-pressure heater, the 8# low-pressure heater is in parallel or double-bank heater stride level in parallel, but also can be connected between the 6#-7# low-pressure heater or between the 7#-8# low-pressure heater.
It is as follows that this integrated system utilizes the residual heat from boiler fume classification to add the principle of hot-air and steam turbine condensate water, in fume side, 300-400 ℃ flue gas of boiler 1 afterbody is through conventional rotary regenerative air preheater 2, enter one-level fume gas condensation water heater 3, enter again deduster 4, deduster outlet flue gas then enters secondary smoke condensation water heater 5, enters forward type low-temperature air preheater 6 again, and its smoke evacuation enters desulfurizer through air-introduced machine 7; The forward type low-temperature air preheater 6 that arranges raises conventional rotary regenerative air preheater 2 intake air temperature, conventional rotary regenerative air preheater 2 exhaust gas temperatures are raise, its temperature is controlled at 150-180 ℃, guarantee that its heat grade is used for heating 6# under the different load condition, 7#, the condensate water of 8# low-pressure heater or 15 outlets of gas trap system, secondary smoke condensate water heat exchanger 5 behind deduster 4 is according to different load heating 7#, 8# low-pressure heater or gas trap system 15 exits condensate water, the extracted steam from turbine that squeezes the different pressures grade, so that the condensate water of the flue gas different temperatures grade of different grades, rationally effective cascade utilization fume afterheat, air is after forward type low-temperature air preheater 6 is preheating to uniform temperature, series connection is sent into and is continued heating in the conventional rotary regenerative air preheater 2, until reach the needed temperature of boiler hot air, when main steam flow is constant, increase to greatest extent the steam turbine output work, by flue gas under the different load, the characteristic of condensate water under different temperatures, select optimum heater connectivity scenario, reach best waste heat recovery state; Improve power plant efficiency.
Claims (3)
1. the integrating device of a boiler smoke classification preheated air and steam turbine condensate water is characterized in that this device is comprised of two-stage fume gas condensation water heater and two-stage air preheater; On the smoke discharging pipe of boiler (1), be in series with successively conventional rotary regenerative air preheater (2), one-level fume gas condensation water heater (3), deduster (4), secondary smoke condensation water heater (5), forward type low-temperature air preheater (6) and air-introduced machine (7); Steam turbine high-pressure cylinder (8), Steam Turbine Through IP Admission (9) and turbine low pressure cylinder (10) are connected step by step, deliver to high pressure back heating system (11) by oxygen-eliminating device (16) and feed pump feedwater; The low pressure heat regenerative system (12) that is comprised of 5# low-pressure heater, 6# low-pressure heater, 7# low-pressure heater and 8# low-pressure heater is in series or is connected in parallel by valve and one-level fume gas condensation water heater (3) and secondary smoke condensation water heater (5).
2. the integrating device of a kind of flue gas classification preheated air according to claim 1 and steam turbine condensate water, it is characterized in that, described one-level fume gas condensation water heater (3) not only can be connected on by booster pump (13) and 5#-6# low-pressure heater or 6#-7# low-pressure heater between, but also can be connected in parallel on 7# or 8# bleeder heater two ends.
3. the integrating device of a kind of flue gas classification preheated air according to claim 1 and steam turbine condensate water, it is characterized in that, described secondary smoke condensation water heater (5) by booster pump (14) respectively with the 7# low-pressure heater, the 8# low-pressure heater is in parallel or with double-bank heater stride the level in parallel; Perhaps be connected between the 6#-7# low-pressure heater or between the 7#-8# low-pressure heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220305182 CN202692021U (en) | 2012-06-27 | 2012-06-27 | Integrated device for graded preheating of air and condensed water of steam turbine by flue gas of boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220305182 CN202692021U (en) | 2012-06-27 | 2012-06-27 | Integrated device for graded preheating of air and condensed water of steam turbine by flue gas of boiler |
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| CN202692021U true CN202692021U (en) | 2013-01-23 |
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| CN 201220305182 Expired - Fee Related CN202692021U (en) | 2012-06-27 | 2012-06-27 | Integrated device for graded preheating of air and condensed water of steam turbine by flue gas of boiler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102767822A (en) * | 2012-06-27 | 2012-11-07 | 华北电力大学 | Integrated system for pre-heating air and condensed water of turbine in grading manner by using boiler smoke |
| CN103644005A (en) * | 2013-12-16 | 2014-03-19 | 王振宇 | Regenerative system of turbogenerator unit and operation method thereof |
-
2012
- 2012-06-27 CN CN 201220305182 patent/CN202692021U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102767822A (en) * | 2012-06-27 | 2012-11-07 | 华北电力大学 | Integrated system for pre-heating air and condensed water of turbine in grading manner by using boiler smoke |
| CN102767822B (en) * | 2012-06-27 | 2015-04-22 | 华北电力大学 | Integrated system for pre-heating air and condensed water of turbine in grading manner by using boiler smoke |
| CN103644005A (en) * | 2013-12-16 | 2014-03-19 | 王振宇 | Regenerative system of turbogenerator unit and operation method thereof |
| CN103644005B (en) * | 2013-12-16 | 2015-05-06 | 王振宇 | Regenerative system of turbogenerator unit and operation method thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Chen Yuan Document name: Notification that Application Deemed not to be Proposed |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130123 Termination date: 20150627 |
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| EXPY | Termination of patent right or utility model |