CN109489098A - A kind of circulating water heating system for large-scale Condensing steam turine - Google Patents
A kind of circulating water heating system for large-scale Condensing steam turine Download PDFInfo
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- CN109489098A CN109489098A CN201811399954.9A CN201811399954A CN109489098A CN 109489098 A CN109489098 A CN 109489098A CN 201811399954 A CN201811399954 A CN 201811399954A CN 109489098 A CN109489098 A CN 109489098A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 73
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 238000005086 pumping Methods 0.000 claims abstract description 8
- 230000000694 effects Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 239000008400 supply water Substances 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 206010037660 Pyrexia Diseases 0.000 description 1
- 238000010795 Steam Flooding Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/02—Hot-water central heating systems with forced circulation, e.g. by pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
Abstract
The present invention relates to a kind of circulating water heating systems for large-scale Condensing steam turine, including turbine low pressure cylinder, input terminal to be connected with Steam Turbine Through IP Admission output end；Eight grades of low-pressure heaters, input terminal are connected with turbine low pressure cylinder output end；Nine grades of low-pressure heaters, input terminal are connected with turbine low pressure cylinder output end, and nine grades of low-pressure heaters are connected with eight grades of low-pressure heaters；Heat low pressure (LP) cylinder, and input terminal is connected with Steam Turbine Through IP Admission output end, and heat the external generating set of low pressure (LP) cylinder；Heat condenser, and input terminal is connected with heating low pressure (LP) cylinder output end, and heat the external vacuum pumping pump of condenser；Heating circulation pump is connected with heating condenser；Condensate pump, input terminal are connected with heating condenser output end, and condensate pump output end is connected with the pipeline for connecting eight grades of low-pressure heaters, nine grades of low-pressure heaters.Circulating water heating system disclosed by the invention can not only reduce heating-amount cost to 10 yuan/GJ, can also improve power plant thermal efficiency.
Description
Technical field
The invention belongs to thermal power plant high efficiency of energy to utilize field, and in particular to a kind of following for large-scale Condensing steam turine
Ring water heating system.
Background technique
Thermal power plant abbreviation thermal power plant is using combustible (such as coal) as the factory of fuel production electric energy.It
The basic process of production is: fuel heating water in burning generates steam, the chemical energy of fuel is transformed into thermal energy, vapour pressure is pushed
Dynamic steam turbine rotation, thermal energy are converted into mechanical energy, and then steam turbine drives generator rotation, and mechanical energy is transformed into electric energy.
The Condensing steam turine of large size firepower hair factory has the following disadvantages at present: pure condensate operating thermal efficiency is low, with compared with senior staff officer
Number steam heats water-borne external heating by reducing-and-cooling plant, wastes high-quality steam, most efficient ultra supercritical condensing engine
The thermal efficiency of group is no more than 50%.
Therefore, improving the large-scale thermal power machine group thermal efficiency becomes a urgent problem.
Summary of the invention
Goal of the invention: the present invention has made improvements in view of the above-mentioned problems of the prior art, i.e., the invention discloses one kind
Circulating water heating system for large-scale Condensing steam turine.
A kind of technical solution: circulating water heating system for large-scale Condensing steam turine, comprising:
Turbine low pressure cylinder, input terminal are connected with the output end of Steam Turbine Through IP Admission by pipeline；
Eight grades of low-pressure heaters, input terminal are connected with the output end of turbine low pressure cylinder by eight grades of pump-lines；
Nine grades of low-pressure heaters, input terminal are connected with the output end of turbine low pressure cylinder by nine grades of pump-lines, and nine
Grade low-pressure heater is connected with eight grades of low-pressure heaters by pipeline；Wherein: further include:
Heat low pressure (LP) cylinder, and input terminal is connected with the output end of Steam Turbine Through IP Admission by pipeline, and heating low pressure (LP) cylinder is external
One generating set；
Heat condenser, and input terminal is connected with the output end of heating low pressure (LP) cylinder by pipeline, and heat condenser external one
The output end of vacuum pumping pump, vacuum pumping pump is communicated with atmosphere；
Heating circulation pump is connected with heating condenser by pipeline, for sending heating circulation water to heating condenser
It is heated, is then sent to heating secondary network heat exchange station；
Condensate pump, input terminal with heating condenser output end be connected, the output end of condensate pump with connect eight grades
Low-pressure heater, the pipeline of nine grades of low-pressure heaters are connected.
It further, further include ten grades of low-pressure heaters, the output end of input terminal and turbine low pressure cylinder passes through ten grades
Pump-line is connected, and ten grades of low-pressure heaters are connected with nine grades of low-pressure heaters by pipeline.
Further, further include condenser, input terminal is connected with the output end of turbine low pressure cylinder, condenser it is defeated
Outlet is connected with the input terminal of ten grades of low-pressure heaters by pipeline, is laid with water pump on the pipeline.
It further, further include seven grades of low-pressure heaters, the output end of input terminal and turbine low pressure cylinder passes through seven
Grade pump-line is connected, and seven grades of low-pressure heaters are connected with eight grades of low-pressure heaters by pipeline.
It further, further include six grades of low-pressure heaters, the output end of input terminal and Steam Turbine Through IP Admission passes through six
Grade pump-line is connected, and six grades of low-pressure heaters are connected with seven grades of low-pressure heaters by pipeline.
It more further, further include oxygen-eliminating device, input terminal is connected with the output end of six grades of low-pressure heaters.
Further, the generating set is tetra- grade blade low pressure (LP) cylinder generating set of 75MW.
The utility model has the advantages that a kind of circulating water heating system for large-scale Condensing steam turine disclosed by the invention is with beneficial below
Effect:
1, reduce heating-amount cost to 10 yuan/GJ (heat cost residential is every year less than 5 yuan/square metre)；
2, power plant thermal efficiency is improved --- the thermal efficiency of power plant can be improved by current 50% to 60% or more.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the circulating water heating system for large-scale Condensing steam turine disclosed by the invention.
Wherein:
1- heating low pressure (LP) cylinder 2- heating condenser
3- vacuum pumping pump 4- heating circulation pump
Six grades of low-pressure heaters of 5- condensate pump 6-
Seven grades of 7-, eight grades of low-pressure heater 8- low-pressure heater
Nine grades of 9-, ten grades of low-pressure heater 10- low-pressure heater
11- water pump
Six grades of 61-, seven grades of pump-line 71- pump-line
Eight grades of 81-, nine grades of pump-line 91- pump-line
Ten grades of pump-lines of 101-
Specific embodiment:
Detailed description of specific embodiments of the present invention below.
As shown in Figure 1, a kind of circulating water heating system for large-scale Condensing steam turine, comprising:
Turbine low pressure cylinder, input terminal are connected with the output end of Steam Turbine Through IP Admission by pipeline；
Eight grades of low-pressure heaters 8, input terminal are connected with the output end of turbine low pressure cylinder by eight grades of pump-lines 81；
Nine grades of low-pressure heaters 9, input terminal are connected with the output end of turbine low pressure cylinder by nine grades of pump-lines 91,
Nine grades of low-pressure heaters 9 are connected with eight grades of low-pressure heaters 8 by pipeline；Wherein: further include:
Heat low pressure (LP) cylinder 1, and input terminal is connected with the output end of Steam Turbine Through IP Admission by pipeline, heats outside low pressure (LP) cylinder 1
Connect a generating set；
Heat condenser 2, and input terminal is connected with the output end of heating low pressure (LP) cylinder 1 by pipeline, and heating condenser 2 is external
One vacuum pumping pump 3, the output end of vacuum pumping pump 3 are communicated with atmosphere；
Heating circulation pump 4 is connected with heating condenser 2 by pipeline, for sending heating circulation water to heating condensing
Device 2 is heated, and heating secondary network heat exchange station is then sent to；
Condensate pump 5, input terminal with heating condenser 2 output end be connected, the output end of condensate pump 5 with connect eight
The pipeline of grade 8, nine grades of low-pressure heaters 9 of low-pressure heater is connected.
It further, further include ten grades of low-pressure heaters 10, the output end of input terminal and turbine low pressure cylinder passes through ten
Grade pump-line 101 is connected, and ten grades of low-pressure heaters 10 are connected with nine grades of low-pressure heaters 9 by pipeline.
It further, further include condenser, input terminal is connected with the output end with turbine low pressure cylinder, condenser
Output end is connected with the input terminal of ten grades of low-pressure heaters 10 by pipeline, and water pump 11 is laid on the pipeline.
It further, further include seven grades of low-pressure heaters 7, the output end of input terminal and turbine low pressure cylinder passes through seven
Grade pump-line 71 is connected, and seven grades of low-pressure heaters 7 are connected with eight grades of low-pressure heaters 8 by pipeline.
It further, further include six grades of low-pressure heaters 6, the output end of input terminal and Steam Turbine Through IP Admission passes through six
Grade pump-line 61 is connected, and six grades of low-pressure heaters 6 are connected with seven grades of low-pressure heaters 7 by pipeline.
It more further, further include oxygen-eliminating device, input terminal is connected with the output end of six grades of low-pressure heaters 6.
Further, the generating set is tetra- grade blade low pressure (LP) cylinder generating set of 75MW.
Configure 75MW low pressure (LP) cylinder generating set, recirculated water externally heats (based on data are designed by 1000MW unit parameter
It calculates).
Process flow: tetra- grade blade low pressure (LP) cylinder generating set of 75MW is set at main building enlarging end, vapour source is from steam turbine
Cylinder pressure to turbine low pressure cylinder steam guiding tube draws flow 500t/h, and steam drives generating set power generation in the heating acting of low pressure (LP) cylinder 1,
Load 65.5MW, heating 1 steam discharge parameter of low pressure (LP) cylinder reduce, and are vented absolute pressure 40kPa, 75 DEG C of delivery temperature, are vented enthalpy
2636.8kj/kg.It is vented using heating low pressure (LP) cylinder 1, passes through matched 2 heating recirculated water of heating condenser, heating circulation
65 DEG C of water supply water temperature, recirculated water return water temperature presses 40 DEG C.
The purpose that low pressure (LP) cylinder generating set is arranged improves the thermal efficiency and economy of thermal power plant.Steam Turbine Through IP Admission is to steamer
Machine low pressure (LP) cylinder steam guiding tube steam parameter is higher, by four grade blade low pressure (LP) cylinder generating sets, steam thermal energy is made to be fully converted into electricity
Energy.Using being fully converted into the steam condensation heat release after electric energy, heating recirculated water.By calculating, normally transported in this device
Row operating condition, every available heating 8.4MW thermic load of reduction 1MW electric load, heat-economy are high.
Configure the effect of 75MW heating low pressure (LP) cylinder generating set: the higher 3108.5kj/ of steam enthalpy drawn from intermediate pressure cylinder
Kg makes steam high-quality heat energy be fully converted into electric energy by 75MW low pressure (LP) cylinder generating set, improves system economy.
Smaller heating system supply backwater temperature difference is 25 DEG C, quantity of circulating water 11000t/h, configures diameter by economical rationality flow velocity
1.2 to 1.5 meters of heating pipe network systems supply heat to secondary network heat exchange station.
The effect of vacuum pumping pump is separately provided: 75 DEG C of low pressure (LP) cylinder delivery temperature, corresponding vacuum degree is lower, and negative pressure is arranged
60kPa pumped vacuum systems configures water ring vacuum pump.
Condense the effect of water system pump: condensed water is arranged to guarantee the thermal efficiency in 75 DEG C of low pressure (LP) cylinder condenser condensed water temperature of heating
Pump, low pressure (LP) cylinder condensed water enter the close main condensate water system of temperature.
Calculating process:
Heating parameter: 65 DEG C of supply water temperature, 40 DEG C of return water temperature.
Steam parameter: steam guiding tube steam parameter 0.422MPa, 3108.5kj/kg, 320.4 DEG C；
Heat low pressure (LP) cylinder exhaust parameter 0.040MPa, 2636.8kj/kg, 75.8 DEG C；
Original design steam discharge parameter 2361.8kj/kg
Heat parameter: 75 DEG C of water enthalpy 313.6kj/kg,
65 DEG C of water enthalpy 271.8kj/kg,
40 DEG C of water enthalpy 167.2kj/kg,
Heat low pressure (LP) cylinder capacity: 500t/h
Heat low pressure (LP) cylinder power (3108.5-2636.8) × 500 ÷ 3600=65.5MW
Because delivery temperature increases, generation load is reduced
The low pressure (LP) cylinder that heats reduces load (2636.8-2361.8) × 500 ÷ 3600=38.2MW
Increase heating demand: 500 × (2636.8-313.6) ÷ 3600=322.6MW
Heating circulation water: 500 × (2636.8-313.6) ÷ (271.8-167.2) t/h=11105t/h
Power plant thermal efficiency increases 322.6-38.2MW=284.4MW, and power plant thermal efficiency improves 14%.
Rate for incorporation into the power network is calculated by 0.3 yuan/kwh, loses the electricity charge: 38.2 × 1000 × 0.3=11460 member per hour
The every GJ cost of heat supply: 11460 ÷ (322.6 × 3.6)=9.87 yuan/GJ
65 DEG C of hot water can be 7,000,000 square metres of user's heating in 20 kilometer range of radius, meet general county town (15~20
Ten thousand people) heating demands.To improve heating efficiency, design heat supply temperature is lower, and heat flow 10,000 2 kilostere per hour, needs
Construction is relatively large in diameter 1.2 meters to 1.5 meters for water return pipeline.Heating temperature can be improved by technical economic analysis to 80 DEG C,
It is appropriate to reduce hot duct diameter.
Thermal Corp supplies 40 yuan/GJ or more of heat user, presses 2800h within 1 year.300MW heat capacity can be flat for 7,000,000
Square rice and flour product heating.The heating of this scheme, heat cost press 10 yuan/GJ, and 30 yuan/GJ of terminal price is calculated, annual gross profit 6000
Wan Yuan is recoverable to investment in two years.
Only consider that heat does not consider quality, 1GJ heat and 34.12 kilograms of standard calorific value of coal (25 yuan/GJ), 25.9 cubes
Rice calorific capacity of natural gas (52 yuan/GJ), the calorific value (150 yuan/GJ) of 277 degree of electricity, air energy heat pump consume the fever of 80 degree of electricity
Measure (45 yuan/GJ) quite.Corresponding heat cost difference is huge.In key city, country needs to widely popularize cogeneration of heat and power,
Especially recirculated water heats, and makes full use of low-quality heat source that can save a large amount of high-grade energies, Beijing should be 50 kilometers around
Radius arranges 4 to 6 complete alternation water heating coal-burning power plants, and each power plant's heat load is by 4000MW design (100,000,000 square metres), warp
Ji reasonably solves the problems, such as full Winter of Beijing urban heat supplying.
2, the influence to existing unit:
2.1 existing low pressure (LP) cylinder capacities reduce one third, corresponding low-pressure heater heating temperature decline.
2.2 turbine low pressure cylinder temperature changes, influence to thermally expand.
2.3 low pressure (LP) cylinder capacities reduce vacuum degree and improve.
Embodiments of the present invention are elaborated above.But present invention is not limited to the embodiments described above,
Technical field those of ordinary skill within the scope of knowledge, can also do without departing from the purpose of the present invention
Various change out.
Claims (6)
1. a kind of circulating water heating system for large-scale Condensing steam turine, comprising:
Turbine low pressure cylinder, input terminal are connected with the output end of Steam Turbine Through IP Admission by pipeline；
Eight grades of low-pressure heaters, input terminal are connected with the output end of turbine low pressure cylinder by eight grades of pump-lines；
Nine grades of low-pressure heaters, input terminal are connected with the output end of turbine low pressure cylinder by nine grades of pump-lines, and nine grades low
Pressure heater is connected with eight grades of low-pressure heaters by pipeline；It is characterized by further comprising:
Heat low pressure (LP) cylinder, and input terminal is connected with the output end of Steam Turbine Through IP Admission by pipeline, the external hair of heating low pressure (LP) cylinder
Motor group；
Heat condenser, and input terminal is connected with the output end of heating low pressure (LP) cylinder by pipeline, and heating condenser external one is taken out true
Sky pump, the output end of vacuum pumping pump are communicated with atmosphere；
Heating circulation pump being connected by pipeline with heating condenser, being carried out for sending heating circulation water to heating condenser
Heating is then sent to heating secondary network heat exchange station；
Condensate pump, input terminal with heating condenser output end be connected, the output end of condensate pump with connect eight grades of low pressure
Heater, the pipeline of nine grades of low-pressure heaters are connected.
2. a kind of circulating water heating system for large-scale Condensing steam turine according to claim 1, which is characterized in that also wrap
Ten grades of low-pressure heaters are included, input terminal is connected with the output end of turbine low pressure cylinder by ten grades of pump-lines, ten grades of low pressure
Heater is connected with nine grades of low-pressure heaters by pipeline.
3. a kind of circulating water heating system for large-scale Condensing steam turine according to claim 2, which is characterized in that also wrap
Condenser is included, input terminal is connected with the output end of turbine low pressure cylinder, the output end of condenser and ten grades of low-pressure heaters
Input terminal is connected by pipeline, is laid with water pump on the pipeline.
4. a kind of circulating water heating system for large-scale Condensing steam turine according to claim 1 or 3, which is characterized in that
It further include seven grades of low-pressure heaters, input terminal is connected with the output end of turbine low pressure cylinder by seven grades of pump-lines, and seven grades
Low-pressure heater is connected with eight grades of low-pressure heaters by pipeline.
5. a kind of circulating water heating system for large-scale Condensing steam turine according to claim 4, which is characterized in that also wrap
Six grades of low-pressure heaters are included, input terminal is connected with the output end of Steam Turbine Through IP Admission by six grades of pump-lines, six grades of low pressure
Heater is connected with seven grades of low-pressure heaters by pipeline.
6. a kind of circulating water heating system for large-scale Condensing steam turine according to claim 5, which is characterized in that also wrap
Oxygen-eliminating device is included, input terminal is connected with the output end of six grades of low-pressure heaters.
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| CN201811399954.9A CN109489098A (en) | 2018-11-22 | 2018-11-22 | A kind of circulating water heating system for large-scale Condensing steam turine |
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| CN201811399954.9A CN109489098A (en) | 2018-11-22 | 2018-11-22 | A kind of circulating water heating system for large-scale Condensing steam turine |
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2018
- 2018-11-22 CN CN201811399954.9A patent/CN109489098A/en active Pending
Patent Citations (8)
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|---|---|---|---|---|
| CN102777961A (en) * | 2012-08-14 | 2012-11-14 | 江西省电力设计院 | Efficient heating system of direct air cooling machine set |
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