CN102777961A - Efficient heating system of direct air cooling machine set - Google Patents
Efficient heating system of direct air cooling machine set Download PDFInfo
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- CN102777961A CN102777961A CN201210286872XA CN201210286872A CN102777961A CN 102777961 A CN102777961 A CN 102777961A CN 201210286872X A CN201210286872X A CN 201210286872XA CN 201210286872 A CN201210286872 A CN 201210286872A CN 102777961 A CN102777961 A CN 102777961A
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Abstract
The invention discloses an efficient heating system of a direct air cooling machine set. The efficient heating system of the direct air cooling machine set comprises a boiler, a steam turbine high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a power generator, an air cooling device, a heating network circulating pump and a connecting pipeline. The efficient heating system of the direct air cooling machine set is provided with a steam condensate device which is connected with a steam discharge pipeline of the low-pressure cylinder of the steam turbine; a heating network backwater pipeline is connected with an inlet of a steam condensate device water chamber; an outlet of the steam condensate device water chamber is connected with each heat consumer through heating network pipelines; a heating network heater also can be arranged additionally, the heating network circulating water inlet end is connected with a water outlet of the steam condensate device water chamber through a pipeline; and the outlet end of the steam condensate device water chamber is connected with each heat consumer through the heating network pipelines. According to the invention, the discharged steam of the steam turbine is sent to the steam condensate device, and is cooled down by backwater of the heating network circulating water; the heating network backwater is directly sent to each heat consumer after being heated by discharged steam by the steam turbine, or is heated by the heating network heater, and is the sent to each heat consumer; the efficient heating system of the direct air cooling machine set is suitable for the heating systems of the direct air cooling machine sets of various models, is very obvious in an energy-saving effect, and improves the heating capability of the machine set.
Description
Technical field
The present invention relates to the Direct Air-cooled Unit heating system, belong to the cogeneration of heat and power field.
Background technology
Northeast, North China, the Northwest's cold in winter are very long, and the lowest temperature reaches-40 ~-50 ℃, and in order to solve resident's warming problem, big and medium-sized cities all have the steam power plant of central heating.Conventional urban heating hot-water heating system is made up of boiler 1, steam turbine high-pressure cylinder 2, intermediate pressure cylinder 3, low pressure (LP) cylinder 4, generator 5, air cooler 6, extraction valve 8, extraction line 10, heat exchangers for district heating 11, drainage pump 12, oxygen-eliminating device 13, heat supply network heat exchanger 14, one-level circulation pump of heat-supply network 15, secondary circulation pump of heat-supply network 17, hot user 16 and mutual connection pipeline etc.One-level heat supply network backwater is delivered to each heat exchange station after the heat exchangers for district heating heating of Gateway Station in Heating Network, through the heat supply network heat exchanger heat is passed to secondary heat supply network recirculated water, and heat energy is delivered to each user the most at last.About 130 ℃ of general one-level heat supply network supply water temperature, return water temperature is about 70 ℃, and secondary heat supply network supply water temperature is about 80 ℃, and return water temperature is about 60 ℃.
The steam turbine of steam power plant is the thermal and electric two way unit, and steam turbine moves by the pure condensate mode between non-heating period.Between heating period, heating steam is extracted out from turbine low pressure cylinder, delivers to heat exchangers for district heating; Heating heat supply network recirculated water; Because the heating steam flow is big, for making things convenient for Flow-rate adjustment, and consider the structural factor of steam turbine; Usually heating steam is extracted out from the mesolow unicom pipeline that connects Steam Turbine Through IP Admission and low pressure (LP) cylinder, and behind bleeding point, arranges extraction valve.The draw gas shortcoming of scheme of this heating: the one, low pressure (LP) cylinder still need be guaranteed certain steam through-current capacity, with cooled blade, therefore, the thermal loss that enters the steam of condenser still exists; The 2nd, because of the low pressure (LP) cylinder inlet flow rate significantly reduces, inlet pressure obviously reduces, steam acting ability drop; Simultaneously because of movable vane inlet flow velocity substantial deviation design load; The internal efficiency of low pressure (LP) cylinder is significantly reduced, and the steam enthalpy that enters condenser obviously increases, and the condensation loss of specific discharge increases; The 3rd, because of the shunting of low pressure (LP) cylinder, the heat capacity of steam turbine is restricted.
Because North China, northwest are the areas that China's water resource extremely lacks, for using water wisely, the thermoelectric unit of the heating of building in recent years all adopts Direct Air-Cooling Technology, promptly utilizes air directly to cool off the exhaust steam that steam turbine is discharged.Because summer temperature is higher, thus summer unit exhaust steam pressure higher, reach 36kPa, corresponding condensing water temperature is 73.4 ℃, at present, the designing and arranging steam pressure of domestic Direct Air-cooled Unit reaches as high as 39 ~ 40 kPa, corresponding condensing water temperature is 75.3 ~ 75.9 ℃.
Summary of the invention
The objective of the invention is to: the heat that utilizes steam turbine to enter the exhaust steam of air cooler heats, and avoids the thermal loss of turbine discharge between heating period, can significantly improve efficiency of energy utilization, and improves the heat capacity of unit.
The object of the invention is realized through following scheme: comprise boiler, steam turbine high-pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder, generator, air cooler, condenser, pumps for hot water supply net and mutual connection pipeline; It is characterized in that: be provided with the condenser that is connected with the turbine low pressure cylinder blow-off line; The heat supply network water return pipeline is connected with the import of condenser water box, and the outlet of condenser water box links to each other with each hot user through heat-net-pipeline.
The present invention has additional heat exchangers for district heating, and the entrance point of its heat supply network recirculated water is connected with the delivery port of condenser water box through pipeline, and the port of export links to each other with each hot user through heat-net-pipeline.
The present invention is serially connected with valve on the blow-off line that connects low pressure (LP) cylinder and air cooler; Blow-off line connects condenser through another valve, and the hot well of condenser is connected with the exhaust pipeline with the hot well of air cooler through first pipeline, first valve and second pipeline, second valve respectively with the exhaust pipeline.Condenser, circulation pump of heat-supply network serial connection back constitute the circulation heat supply network with hot user.
The present invention is applicable to the heating system of the Direct Air-cooled Unit of various models.Heating period in the winter time, steam turbine adopts the high back pressure method of operation, the exhaust steam that utilizes the backwater cooling steam turbine of heat supply network recirculated water to discharge; Consider the terminal temperature difference of condenser; The cooling water leaving water temperature can reach about 70 ℃, satisfies the requirement of heating hot water basically, can directly deliver to each hot user; Heat exchangers for district heating also capable of using further is heated to more than 80 ℃, delivers to each hot user through hot water pipe net then.Owing to made full use of the heat of turbine discharge, be equivalent to the method for operation of back pressure unit between heating period, energy-saving effect is fairly obvious.The non-heating period turbine discharge still uses the air cooler cooling, moves by the pure condensate mode.
Summary of the invention
Key in summary of the invention herein and describe paragraph.
Description of drawings
Fig. 1 is traditional conventional heating system sketch map of Direct Air-cooled Unit;
Fig. 2 is the embodiment of the invention 1 structural representation;
Fig. 3 is the embodiment of the invention 2 structural representations.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is elaborated.
Embodiment 1:
Present embodiment is made up of boiler 1, steam turbine high-pressure cylinder 2, intermediate pressure cylinder 3, low pressure (LP) cylinder 4, generator 5, air cooler 6, pumps for hot water supply net 22, condenser 21, circulation pump of heat-supply network 22 and mutual connection pipeline; Intermediate pressure cylinder 3, low pressure (LP) cylinder 4 connect through unicom pipeline 7; Be serially connected with exhaust valve 18 on the blow-off line 9 of connection low pressure (LP) cylinder 4 and air cooler 6; And connecting condensers 21 through the 3rd pipeline 19, the 3rd valve 20, the hot well of condenser 21 and exhaust pipeline are connected with the exhaust pipeline with the hot well of air cooler 6 with second pipeline 26, second valve 25 through first pipeline 23, first valve 24 respectively; Condenser 21, circulation pump of heat-supply network 22, hot user 16 and connection pipeline constitute the circulation heat supply network.
Present embodiment is applicable to be transformed the conventional heating system of traditional Direct Air-cooled Unit; Promptly in the conventional heating system of traditional Direct Air-cooled Unit, increase condenser 21; In the blow-off line 9 that connects low pressure (LP) cylinder 4 and air cooler 6, increase exhaust valve 18; And increase connecting the 3rd pipeline 19 and the 3rd valve 20 of condenser 21, the hot well of condenser 21 and exhaust pipeline are connected with the exhaust pipeline with the hot well of air cooler 6 with second pipeline 26, second valve 25 through first pipeline 23, first valve 24 respectively; Remove one-level circulation pump of heat-supply network 15, heat supply network heat exchanger 14, secondary circulation pump of heat-supply network 17 and associated conduit, remove simultaneously and be installed in extraction valve 8, heat exchangers for district heating 11 and extraction line 10 thereof, drainage pump 12 and the drain water piping on the unicom pipeline 7.The heat supply network circulating water pipeline of setting up new circulation pump of heat-supply network 22 and being connected with condenser 21, hot user 16.
Present embodiment is on the basis of embodiment 1; Unicom pipeline 7 connects low pressure (LP) cylinder 4 through extraction valve 8; The cycling hot that condenser 21, circulation pump of heat-supply network 22 and hot user 16 constitute is connected in series heat exchangers for district heating 11 on the net; Heat exchangers for district heating 11 connects mesolow unicom pipeline 7 through pump-line 10, and the hydrophobic interface of heat exchangers for district heating 11 connects oxygen-eliminating device 13 through drainage pump 12.
Present embodiment also is applicable to be transformed the conventional heating system of traditional Direct Air-cooled Unit.Principle is identical with embodiment.Keep being installed in extraction valve 8, heat exchangers for district heating 11 and extraction line 10 thereof, drainage pump 12 and the drain water piping on the unicom pipeline 7, other structure is identical with embodiment 1.
Experimental example: behind the overcritical condensing-type Direct Air-Cooled Turbo-generator Set embodiment of the present invention embodiment 2 that draws gas of the 350MW of Shanghai steam turbine plant production; The thermal loss of every unit minimizing turbine discharge is equivalent to mark 22.59 tons/hour in coal; Heating load increases by 42.66%; Calculate 8084.32 ten thousand yuan of newly-increased heat supply benefits, 81325.14 tons in feast-brand mark coal by 5 months heating phases, 36.9 yuan/GJ of caloric value.
The performance comparison sheet of unit before and after the present invention transforms for conventional art
Annotate: go up table and calculate, do not consider the radiation loss of each heater by generator efficiency 98.6%, mechanical efficiency 99%, boiler efficiency 93%, pipeline efficient 99%.
[0002]Key in background technology herein and describe paragraph.
Claims (3)
1. Direct Air-cooled Unit highly effective heating system; Comprise boiler, steam turbine high-pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder, generator, air cooler, pumps for hot water supply net and mutual connection pipeline; It is characterized in that: be provided with the condenser that is connected with the turbine low pressure cylinder blow-off line; The heat supply network water return pipeline is connected with the import of condenser water box, and the outlet of condenser water box links to each other with each hot user through heat-net-pipeline.
2. Direct Air-cooled Unit highly effective heating according to claim 1 system; It is characterized in that: set up heat exchangers for district heating; The entrance point of its heat supply network recirculated water is connected with the delivery port of condenser water box through pipeline, and the port of export links to each other with each hot user through heat-net-pipeline.
3. Direct Air-cooled Unit highly effective heating according to claim 1 and 2 system; It is characterized in that: be serially connected with valve on the blow-off line of connection low pressure (LP) cylinder and air cooler; Blow-off line connects condenser through another valve, and the hot well of condenser is connected with the exhaust pipeline with the hot well of air cooler through first pipeline, first valve and second pipeline, second valve respectively with the exhaust pipeline.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102997309A (en) * | 2012-12-26 | 2013-03-27 | 北京国电蓝天节能科技开发有限公司 | Classification heating system with high-temperature heat source heater bypass pipe |
| CN102997310A (en) * | 2012-12-26 | 2013-03-27 | 北京国电蓝天节能科技开发有限公司 | Low-temperature heat source warming and heating system of air cooling unit |
| CN103017233A (en) * | 2012-12-26 | 2013-04-03 | 北京国电蓝天节能科技开发有限公司 | Low-level energy classified hybrid heating system for air cooling unit |
| CN103017231A (en) * | 2012-12-11 | 2013-04-03 | 华电电力科学研究院 | Heat supply network water circulating pump energy-saving driving system of thermal power plant |
| CN103615291A (en) * | 2013-12-17 | 2014-03-05 | 山东泓奥电力科技有限公司 | Flutter monitoring and early warning protection system for last-stage blade during high back pressure operation of air cooling unit |
| CN109489098A (en) * | 2018-11-22 | 2019-03-19 | 李申强 | A kind of circulating water heating system for large-scale Condensing steam turine |
| CN109902426A (en) * | 2019-03-12 | 2019-06-18 | 上海发电设备成套设计研究院有限责任公司 | Air-cooled type high-parameter steam turbine high intermediate pressure cylinder performance and structure design and monitoring method |
| CN110847977A (en) * | 2019-11-25 | 2020-02-28 | 东方电气集团东方汽轮机有限公司 | High back pressure heating system suitable for arid area |
| CN111928316A (en) * | 2020-09-03 | 2020-11-13 | 西安热工研究院有限公司 | Heat supply network peak heating system and method |
| CN113375213A (en) * | 2021-06-15 | 2021-09-10 | 南京工业大学 | Novel combined heat and power generation system and method based on double-unit operation mode |
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| CN101832156A (en) * | 2010-05-10 | 2010-09-15 | 江苏双良空调设备股份有限公司 | Condensation heat recovering and central heating supply system of power plant direct air cooling unit |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017231A (en) * | 2012-12-11 | 2013-04-03 | 华电电力科学研究院 | Heat supply network water circulating pump energy-saving driving system of thermal power plant |
| CN102997309A (en) * | 2012-12-26 | 2013-03-27 | 北京国电蓝天节能科技开发有限公司 | Classification heating system with high-temperature heat source heater bypass pipe |
| CN102997310A (en) * | 2012-12-26 | 2013-03-27 | 北京国电蓝天节能科技开发有限公司 | Low-temperature heat source warming and heating system of air cooling unit |
| CN103017233A (en) * | 2012-12-26 | 2013-04-03 | 北京国电蓝天节能科技开发有限公司 | Low-level energy classified hybrid heating system for air cooling unit |
| CN103615291A (en) * | 2013-12-17 | 2014-03-05 | 山东泓奥电力科技有限公司 | Flutter monitoring and early warning protection system for last-stage blade during high back pressure operation of air cooling unit |
| CN103615291B (en) * | 2013-12-17 | 2016-03-02 | 山东泓奥电力科技有限公司 | Air-cooled Unit high back pressure runs exhaust stage blade monitoring chatter early warning protection system |
| CN109489098A (en) * | 2018-11-22 | 2019-03-19 | 李申强 | A kind of circulating water heating system for large-scale Condensing steam turine |
| CN109902426A (en) * | 2019-03-12 | 2019-06-18 | 上海发电设备成套设计研究院有限责任公司 | Air-cooled type high-parameter steam turbine high intermediate pressure cylinder performance and structure design and monitoring method |
| CN110847977A (en) * | 2019-11-25 | 2020-02-28 | 东方电气集团东方汽轮机有限公司 | High back pressure heating system suitable for arid area |
| CN110847977B (en) * | 2019-11-25 | 2022-05-10 | 东方电气集团东方汽轮机有限公司 | High back pressure heating system suitable for arid area |
| CN111928316A (en) * | 2020-09-03 | 2020-11-13 | 西安热工研究院有限公司 | Heat supply network peak heating system and method |
| CN111928316B (en) * | 2020-09-03 | 2024-02-27 | 西安热工研究院有限公司 | Heating system and method for peak of heat supply network |
| CN113375213A (en) * | 2021-06-15 | 2021-09-10 | 南京工业大学 | Novel combined heat and power generation system and method based on double-unit operation mode |
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Application publication date: 20121114 |