CN102434998A - Combined cycling system for concentrated cooling improvement in thermal power plant - Google Patents
Combined cycling system for concentrated cooling improvement in thermal power plant Download PDFInfo
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- CN102434998A CN102434998A CN2011102749124A CN201110274912A CN102434998A CN 102434998 A CN102434998 A CN 102434998A CN 2011102749124 A CN2011102749124 A CN 2011102749124A CN 201110274912 A CN201110274912 A CN 201110274912A CN 102434998 A CN102434998 A CN 102434998A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
Abstract
The invention provides a combined cycling system for concentrated cooling improvement in a thermal power plant, relating to a combined cycling system. The combined cycling system provided by the invention solves the problem that a great amount of energy is lost due to that superheated steam with an ultra high pressure is treated by a temperature-decreased pressure reducer when the concentrated cooling is carried out by adopting an absorption refrigerator in the existing thermal power plant. In the invention, a compressor of a compression refrigerator is driven by an industrial dragging turbine to carry out mechanical compression type refrigeration; steam is exhausted by an outlet of the industrial dragging turbine and the steam enters into a high-pressure generator of a double-effect absorption refrigerator so as to drive the absorption refrigerator to cycle; the compression refrigerator is coaxially connected with the industrial dragging turbine; the absorption refrigerator is connected with the industrial dragging turbine through a medium-pressure steam connection pipe; a steam saturator and a steam trap are arranged on the medium-pressure steam connection pipe in sequence; and a chilled water connection pipe and a cooling water connection pipe pass through the double-effect absorption refrigerator and the compression refrigerator in sequence. The system provided by the invention is applicable to the concentrated cooling in the thermal power plant.
Description
Technical field
The present invention relates to a kind of combined cycle system, be specifically related to a kind of combined cycle system that steam power plant's central cooling is transformed that is used for.
Background technology
Cogeneration of heat and power is the advanced using energy source form of a kind of not only electrogenesis but also heat production.The energy utilization rate of tradition thermal power plant is generally about 35%; Behind the energy that consumes same quantity quality of the same race; Steam power plant not only can provide electric energy; The hot water that can also provide steam that commercial production uses and heating radiators to use; Its energy utilization rate reaches more than 45%, owing to have huge energy-saving potential, steam power plant has obtained using widely in China this year.But owing to have more irrational factor at design, operation and management aspect at present; There are a lot of drawbacks in the operation of present stage cogeneration of heat and power enterprise; Wherein more topmost be exactly summer bigger to the harmful effect of environment: summer fever power plant becomes pure thermal power plant; The serious waste of low grade heat energy resource, and the pollutant discharge amount of large-scale thermoelectric unit is big, so aggravate environmental pollution summer.
In summer the heat energy of steam power plant is carried out reasonable use and can reduce the adverse effect of thermoelectric enterprise summer operation, improve its energy-saving benefit and environmental benefit environment.In steam power plant, carrying out central cooling summer is a kind of effective means.Steam power plant generally uses Absorption Refrigerator to freeze at present; But double-effect absorption refrigerating machine has certain requirement to steam quality; Promptly need the saturated vapor of 0.4～0.8Mpa to drive; But the minimum extraction pressure of power plant is generally the superheated steam of 0.8MPa～1.6MPa, must will bleed to carry out pressure and temperature reducing and reduce to the saturated vapor that meets the pressure requirement and just can utilize later on, and this part utilizes temperature-decreased pressure reducer to handle the process of bleeding and has just caused great energy loss.
Summary of the invention
When the objective of the invention is to freeze for the Absorption Refrigerator that solves existing steam power plant central cooling; Must will bleed and carry out the problem that pressure and temperature reducing is handled a large amount of losses of energy that cause, and then propose a kind of combined cycle system that steam power plant's central cooling is transformed that is used for.
Technical scheme of the present invention is: a kind of combined cycle system that is used for steam power plant's central cooling transformation comprises electric turbine, condenser and the first condensate tube connector; Electric turbine provides steam by boiler; The first condensate tube connector is connected with electric turbine; Condenser is arranged on the first condensate tube connector; Said combined cycle system comprises that also industry drags steam turbine, compression refrigerating machine, steam saturator, steam trap, double-effect absorption refrigerating machine, middle pressure steam tube connector, chilled water tube connector, cooling water tube connector, steam turbine tube connector and the second condensate tube connector; Industry drags the side that steam turbine is arranged on electric turbine; Industry drags between steam turbine and the electric turbine and is connected through the steam turbine tube connector, and industry drags steam turbine and the coaxial setting of compression refrigerating machine, and double-effect absorption refrigerating machine drags between the steam turbine with industry and is connected through the middle pressure steam tube connector; Steam saturator and steam trap are successively set on the middle pressure steam tube connector, and chilled water tube connector and cooling water tube connector pass double-effect absorption refrigerating machine and compression refrigerating machine successively.
The present invention compared with prior art has following effect: 1. the part that industry of the present invention drags steam turbine Driven by Coaxial compression refrigerating machine effectively substituted the required setting of former double-effect absorption refrigerating machine temperature-decreased pressure reducer; And utilize pressure and temperature reducing to cause this part energy band dynamic pressure compression type refrigerating of vapour losses; Improve energy utilization efficiency, avoided the loss of energy.2. reliable operation of the present invention also has refrigerating efficiency height,, the advantage of saving power plant superheated steam consumption little to the environment negative effect simultaneously.
Description of drawings
Fig. 1 is that (double-head arrow representes to become after power plant's superheated steam utilization the flow direction of condensate to overall structure sketch map of the present invention; Hollow arrow is represented the flow direction of chilled water; Filled arrows is represented the flow direction of cooling water; Three arrows are represented the compression-type refrigeration refrigerant flow direction).
The specific embodiment
The specific embodiment one: combine Fig. 1 that this embodiment is described; A kind of combined cycle system that is used for steam power plant's central cooling transformation of this embodiment comprises electric turbine 1, condenser 2 and the first condensate tube connector 3; Electric turbine 1 provides steam by boiler; The first condensate tube connector 3 is connected with electric turbine 1; Condenser 2 is arranged on the first condensate tube connector 3; Said combined cycle system comprises that also industry drags steam turbine 4, compression refrigerating machine 5, steam saturator 6, steam trap 7, double-effect absorption refrigerating machine 8, middle pressure steam tube connector 9, chilled water tube connector 10, cooling water tube connector 11, steam turbine tube connector 12 and the second condensate tube connector 13; Industry drags the side that steam turbine 4 is arranged on electric turbine 1; Industry drags between steam turbine 4 and the electric turbine 1 and is connected through steam turbine tube connector 12, and industry drags steam turbine 4 and compression refrigerating machine 5 coaxial settings, and double-effect absorption refrigerating machine 8 drags between the steam turbine 4 with industry and is connected through middle pressure steam tube connector 9; Steam saturator 6 is successively set on the middle pressure steam tube connector 9 with steam trap 7; Chilled water tube connector 10 passes double-effect absorption refrigerating machine 8 and compression refrigerating machine 5 successively with cooling water tube connector 11, and chilled water flows out through chilled water tube connector 10 after freezing through double-effect absorption refrigerating machine 8 and compression refrigerating machine 5 respectively, cooling water through double-effect absorption refrigerating machine 8 or compression refrigerating machine 5 coolings after supercooled water tube connector 11 flow out.
The specific embodiment two: combine Fig. 1 that this embodiment is described; The compression refrigerating machine 5 of this embodiment comprises compressor 14, first evaporimeter 15, first condenser 16, throttling arrangement 23 and refrigerant line 22; Compressor 14 drags steam turbine 4 coaxial settings with industry, connects and form complete compression-type refrigeration circulation through refrigerant line 22 between compressor 14, first condenser 16, throttling arrangement 23 and first evaporimeter 15.So be provided with, can effectively utilize the heat of former temperature-decreased pressure reducer waste, improve the energy utilization rate of system.Other composition is identical with the specific embodiment one with annexation.
The specific embodiment three: combine Fig. 1 that this embodiment is described; The double-effect absorption refrigerating machine 8 of this embodiment comprises second condenser 17, low pressure generator 18, high pressure generator 19, second evaporimeter 20 and absorber 21; Cooling water tube connector 11 is connected with absorber 21; Low pressure generator 18 is arranged on the below of high pressure generator 19, and absorber 21 is connected through cooling water tube connector 11 with second condenser 17, and chilled water tube connector 10 is connected with second evaporimeter 20; One end of high pressure generator 19 is connected with middle pressure steam tube connector 9, and the other end of high pressure generator 19 is connected with the second condensate tube connector 13.So be provided with, simple in structure, reliable operation also has the advantage that the heat energy utilization rate is high, refrigerating efficiency is high, environmental pollution is little, the whole system energy loss is little simultaneously.Other composition is identical with the specific embodiment one or two with annexation.
The course of work of the present invention is:
1. first condensate outlet: flow out through the first condensate tube connector 3 after steam condenses through condenser 2;
2. second condensate outlet: the steam that industry drags in the steam turbine 4 successively passes through steam saturator 6, steam trap 7 and double-effect absorption refrigerating machine 8, and condensate flows out through the second condensate tube connector 9;
3. chilled water outlet: chilled water first evaporimeter 15 of second evaporimeter 20 through double-effect absorption refrigerating machine 8 and compression refrigerating machine 5 respectively flows out through chilled water tube connector 10 after freezing;
4. coolant outlet: cooling water is made up of two parallelly connected loops: one, cooling water flows out through the absorber 21 and second condenser, 17 backs of double-effect absorption refrigerating machine 8; Two, cooling water directly cools off after supercooled water tube connector 11 flows out through first condenser 16 of compression refrigerating machine 5;
5. compression-type refrigeration refrigerant loop: cold-producing medium through compressor 14, first condenser 16, the throttling arrangement 21 and first evaporimeter 15, is formed complete compression-type refrigeration and is circulated successively.
Specific embodiment of the present invention:
One, engineering background
Power & light company has 5 130t/h stoves and 3 260t/h stoves at present, has 2 15MW simultaneously and takes out 1 25MW back pressure of unit unit with fixed attention, and 1 60MW takes out unit with fixed attention, each 1 of 12MW/15MW back pressure unit.Power plant's supply load in service is bigger, and power generating capacity comparatively lacks, but the quantity of steam of power plant own is sufficient, and having pressure is 1.27MPa, and the maximum industrial steam amount flow that temperature is 304 ℃ reaches 240 tons/hour.Each plant area of the subordinate of power & light company disperses the about 69780KW of refrigeration duty at present.Adopt the electric-driven compression type refrigerating machine group to satisfy above-mentioned cooling load at present, start two Absorption Refrigerators during the peak.This method of operation needs the dispersed placement pipe network, system complex, and operation expense is higher.
Two, new technology necessity in application
Former refrigeration modes system complex, operation expense is higher, and it is comparatively serious to adapt to the short of electricity situation, but the sufficient service condition of quantity of steam.The combined cycle system of using the present invention to propose can solve above-mentioned drawback.Through research and design, confirm combined cycle system, must realize high efficiency energy-saving and emission-reduction for power plant, bring great economic and social benefit.
Three, parameter designing
The design contrasts the scheme of direct employing absorption refrigeration and analyzes
1. directly adopt absorption refrigeration
Get into the saturated vapor of the pressure P=0.8Mpa of Absorption Refrigerator, its enthalpy is h
i=2768.8kJ/kg.Saturation water under the uniform pressure of from Absorption Refrigerator, coming out, its enthalpy are h
e=719.7kJ/kg, needed saturated vapor amount is q
Mg, can be by computes:
q
mg＝(1+e)Q
g/r
In the formula: Q
g---the refrigerating capacity of refrigeration machine, 69780kW;
E---be additional coefficient, 3%～5%;
R---be the latent heat of vaporization of saturated vapor, r=h
i-h
e
Bring each unknown quantity into and can calculate q
Mg=86.106t/h
Superheated steam becomes saturated vapor behind temperature-decreased pressure reducer can use, and needs to calculate according to the quality in the temperature-decreased pressure reducer, energy relationship formula the use amount of superheated steam:
By relationship between quality:
D
e+D
w＝q
mg
In the formula: D
e-superheated steam is gone into attemperator mass flow (kg/s);
D
w-water at low temperature is gone into attemperator mass flow (kg/s);
q
Mg-saturated vapor goes out attemperator mass flow (kg/s).
By energy relationship:
D
eh
e+D
wh
w＝q
mgh
In the formula: h
e---superheated steam is gone into attemperator enthalpy (3051.64kJ/kg);
h
Tw---water at low temperature is gone into attemperator enthalpy (719.7kJ/kg);
H---saturated vapor goes out attemperator enthalpy (2768.8kJ/kg).
Can obtain, the flow of power plant's superheated steam of consumption is 75.64t/h.
2. novel combined cycle system
Steam vapour gets into industry and drags steam turbine, and the outlet exhaust steam reaches and the needed pressure of the import of lithium-bromide absorption-type refrigerating machine group, and Absorption Refrigerator uses behind the superheated steam saturator.Steam drags after steam turbine finishes expansion process in industry, can supply Absorption Refrigerator to use for the saturated vapor that is converted into 0.8MPa, 0.6MPa, 0.4MPa, so intermediate pressure can be regulated, these several kinds different pressure is calculated respectively.
When the pressure of exhaust steam is 0.8MPa, can combine the refrigerating capacity relation to ask the superheated steam amount of consumption by the characteristic equation of temperature-decreased pressure reducer.
In the formula: q
M, g---superheated steam is gone into attemperator mass flow (kg/s);
D
w---water at low temperature is gone into attemperator mass flow (kg/s);
q
Ma---saturated vapor goes out attemperator mass flow (kg/s);
h
e---superheated steam is gone into attemperator enthalpy, 2936.24kJ/kg;
h
w---water at low temperature is gone into attemperator enthalpy, 719.7kJ/kg;
H---saturated vapor goes out attemperator enthalpy, 2768.8kJ/kg;
h
r---superheated steam is gone into the enthalpy of small turbine, 3051.64kJ/kg;
The coefficient of refrigerating performance of ε---compression-type refrigeration gets 4.5;
The coefficient of refrigerating performance of ξ---absorption refrigeration, 1.43;
The shaft work transmission efficiency of η---steam turbine, 0.75;
Q
e---refrigerating capacity, 69780kW.
Can obtain, the flow of power plant's superheated steam of consumption is 70.27t/h.
Equally, can calculate according to above-mentioned algorithm, when intermediate pressure was 0.6MPa, the consumption quantity of steam was 69.43t/h, and when intermediate pressure is 0.4MPa, the consumption quantity of steam is 68.71t/h.
3. the contrast of two kinds of system's air consumptions
Can know that through aforementioned calculation combined cycle system can be saved a large amount of steam consumption quantities with respect to pure absorption system, thereby reach energy-saving effect preferably.Be respectively the system of 0.8MPa, 0.6MPa, 0.4MPa for intermediate pressure, steam saving amount is respectively 5.37t/h, 6.21t/h, 6.93t/h, and visible joint vapour effect and energy-saving effect are obvious.
Four, conclusion
The present invention can find out that through experiment and data computing combined cycle system is not only saved steam flow, and is simple in structure, and reliable operation also has the advantage that the heat energy utilization rate is high, refrigerating efficiency is high, environmental pollution is little, the whole system energy loss is little simultaneously.
Claims (3)
1. one kind is used for the combined cycle system that steam power plant's central cooling is transformed; It comprises electric turbine (1), condenser (2) and the first condensate tube connector (3); Electric turbine (1) provides steam by boiler; The first condensate tube connector (3) is connected with electric turbine (1); Condenser (2) is arranged on the first condensate tube connector (3); It is characterized in that: said combined cycle system comprises that also industry drags steam turbine (4), compression refrigerating machine (5), steam saturator (6), steam trap (7), Absorption Refrigerator (8), middle pressure steam tube connector (9), chilled water tube connector (10), cooling water tube connector (11), steam turbine tube connector (12) and the second condensate tube connector (13); Industry drags the side that steam turbine (4) is arranged on electric turbine (1); Industry drags between steam turbine (4) and the electric turbine (1) and is connected through steam turbine tube connector (12); Compression refrigerating machine (5) and double-effect absorption refrigerating machine (8) are successively set on the below that industry drags steam turbine (4) from left to right, and industry drags steam turbine (4) and the coaxial setting of compression refrigerating machine (5), and double-effect absorption refrigerating machine (8) drags between the steam turbine (4) with industry and is connected through middle pressure steam tube connector (9); Steam saturator (6) and steam trap (7) are successively set on the middle pressure steam tube connector (9), and chilled water tube connector (10) and cooling water tube connector (11) pass double-effect absorption refrigerating machine (8) and compression refrigerating machine (5) successively.
2. according to the said a kind of combined cycle system that steam power plant's central cooling is transformed that is used for of claim 1; It is characterized in that: compression refrigerating machine (5) comprises compressor (14), first evaporimeter (15), first condenser (16), throttling arrangement (23) and refrigerant line (22); Compressor (14) drags the coaxial setting of steam turbine (4) with industry, connects and form complete compression-type refrigeration circulation through refrigerant line (22) between compressor (14), first condenser (16), throttling arrangement (23) and first evaporimeter (15).
3. according to claim 1 or 2 said a kind of combined cycle systems that steam power plant's central cooling is transformed that are used for; It is characterized in that: double-effect absorption refrigerating machine (8) comprises second condenser (17), low pressure generator (18), high pressure generator (19), second evaporimeter (20) and absorber (21); Cooling water tube connector (11) is connected with absorber (21); Low pressure generator (18) is arranged on the below of high pressure generator (19); Absorber (21) is connected through cooling water tube connector (11) with second condenser (17); Chilled water tube connector (10) is connected with second evaporimeter (20), and an end of high pressure generator (19) is connected with middle pressure steam tube connector (9), and the other end of high pressure generator (19) is connected with the second condensate tube connector (13).
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| CN2011102749124A CN102434998A (en) | 2011-09-16 | 2011-09-16 | Combined cycling system for concentrated cooling improvement in thermal power plant |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102878603A (en) * | 2012-10-30 | 2013-01-16 | 哈尔滨工业大学 | Gas-steam circulation combined double-stage coupling heat pump heat supply device |
| CN103453690A (en) * | 2012-05-29 | 2013-12-18 | 浙江盾安人工环境股份有限公司 | Energy-saving absorption heat pump unit with biomass-energy combined cooling, heating and power functions |
| CN103574981A (en) * | 2012-07-20 | 2014-02-12 | 中国石油化工集团公司 | Framework system and method for preparing low-temperature refrigerant |
| CN105240062A (en) * | 2015-10-14 | 2016-01-13 | 付怀仁 | Waste heat recycling and heating system with expansion work recycling function |
| CN111928524A (en) * | 2020-08-07 | 2020-11-13 | 西安西热节能技术有限公司 | Liquefied air energy storage peak regulation system and method based on pre-stage cooling |
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| CN101839518A (en) * | 2010-04-29 | 2010-09-22 | 华北电力大学 | Central heating system and method for coupling circulating water heat pump of power plant with cogeneration |
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2011
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| CN1356770A (en) * | 2000-12-04 | 2002-07-03 | 清华大学 | Method and equipment for regulating peak of electric power |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103453690A (en) * | 2012-05-29 | 2013-12-18 | 浙江盾安人工环境股份有限公司 | Energy-saving absorption heat pump unit with biomass-energy combined cooling, heating and power functions |
| CN103574981A (en) * | 2012-07-20 | 2014-02-12 | 中国石油化工集团公司 | Framework system and method for preparing low-temperature refrigerant |
| CN103574981B (en) * | 2012-07-20 | 2015-12-02 | 中国石油化工集团公司 | A kind of construction system and method preparing low temperature refrigerant |
| CN102878603A (en) * | 2012-10-30 | 2013-01-16 | 哈尔滨工业大学 | Gas-steam circulation combined double-stage coupling heat pump heat supply device |
| CN102878603B (en) * | 2012-10-30 | 2014-10-15 | 哈尔滨工业大学 | Gas-steam circulation combined double-stage coupling heat pump heat supply device |
| CN105240062A (en) * | 2015-10-14 | 2016-01-13 | 付怀仁 | Waste heat recycling and heating system with expansion work recycling function |
| CN111928524A (en) * | 2020-08-07 | 2020-11-13 | 西安西热节能技术有限公司 | Liquefied air energy storage peak regulation system and method based on pre-stage cooling |
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Application publication date: 20120502 |