CN105823109A - System and method for supplying heat outwards in unit - Google Patents
System and method for supplying heat outwards in unit Download PDFInfo
- Publication number
- CN105823109A CN105823109A CN201610187915.7A CN201610187915A CN105823109A CN 105823109 A CN105823109 A CN 105823109A CN 201610187915 A CN201610187915 A CN 201610187915A CN 105823109 A CN105823109 A CN 105823109A
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- Prior art keywords
- heat
- supply network
- heat supply
- unit
- heat exchanger
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- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 59
- 238000012546 transfer Methods 0.000 claims abstract description 15
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 11
- 239000002918 waste heat Substances 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 23
- 239000003517 fume Substances 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000011084 recovery Methods 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 4
- 239000000523 sample Substances 0.000 claims description 3
- 239000013589 supplement Substances 0.000 claims description 3
- 230000003020 moisturizing effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 239000000779 smoke Substances 0.000 abstract description 3
- 238000000605 extraction Methods 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract 3
- 239000003245 coal Substances 0.000 abstract 2
- 238000010248 power generation Methods 0.000 abstract 2
- 239000000446 fuel Substances 0.000 abstract 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 15
- 239000003546 flue gas Substances 0.000 description 15
- 230000000903 blocking effect Effects 0.000 description 5
- 235000019504 cigarettes Nutrition 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000011160 research Methods 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
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/003—Feed-water heater systems
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
Abstract
The invention discloses a system and method for supplying heat outwards in a unit. The system comprises a heat recycling device, a heat exchanger and a heat supply network. The heat recycling device is mounted between an air preheater and a smoke desulfurizing tower of a thermal power generation system. The heat exchanger and the heat recycling device carry out heat exchange through a heat exchange pipeline, and heat is transferred to the heat exchanger. The heat supply network and the heat exchanger carry out heat exchange, heat is transferred to circulating water in the heat supply network, and the heat supply network transfers heat to a user. In the 300MW unit, the flow of the circulating water, capable of being heated by the low-low-temperature coal economizer system for supplying heat outwards, of the heat supply network is 355.44 t/h, and extraction flow of steam in a turbine is reduced by 19 t/h, fuel coal of the unit is reduced by 3.59 g/Kw.h, and waste heat of smoke is utilized; and the heat supply unit is not affected by the adjusting manner of ordering power by heat, and the combined heat and power generation energy saving effect is more obvious.
Description
Technical field
The invention belongs to power domain, be specifically related in a kind of unit the system and method for external heat supply.
Background technology
In modern technologies, cogeneration of heat and power is to improve energy utilization rate, one of important method realizing energy-saving and emission-reduction, no matter due to existing generation dispatching mode unit size, by averagely utilizing hourage scheduling generating after building up, both do not considered energy factor, implemented the principle of " electricity determining by heat " the most completely, it is impossible to made the energy-saving effect of cogeneration of heat and power to give full play to.If the flue gas of discharge has higher temperature in boiler, on the one hand the optimal reaction temperature of wet desulphurization is about 50 DEG C, and the flue gas of higher temperature enters desulphurization system, and desulfurization water consumption can be caused to increase, and then makes the increase of chimney water capacity, chimney reduce from pull out force；On the other hand, the temperature of flue gas is too high, can cause the waste of heat, it is impossible to make full use of the waste heat of flue gas, in turn results in the waste of the energy.Although it has been proposed that by fume afterheat is reclaimed, reduce flue-gas temperature, and then reduce desulfurizing tower water consumption, the system of raising efficiency of dust collection, but the program does not propose to be used for fume afterheat external heat supply in prior art.Although also someone it is also proposed and utilizes absorption type heat pump heat distribution system, fume afterheat is reclaimed, and externally heat supply, but this device is arranged near boiler, heat recovery system arranges more complicated, setup cost is bigger, in addition, owing to the recirculated water in heat-net-pipeline containing the pollutant such as substantial amounts of rust, easily cause heat exchanger tube blocking and corrosion leakage, if directly heat-net-pipeline is connected with low low-level (stack-gas) economizer, if directly heat supply network being carried out heat supply, after causing the blocking of low low-level (stack-gas) economizer, need the maintenance that stops production, and then the operation of boiler can be affected, production process is impacted.It is therefore desirable to research and develop a kind of low cost, the device of efficient heat recovery, and need system is improved so that it is the problem that heat exchanger blocking can be solved.
Summary of the invention
The purpose of the present invention is exactly for solving the problems referred to above, it is provided that the system and method for external heat supply in a kind of unit.
For achieving the above object, the present invention adopts the following technical scheme that
The system of external heat supply in a kind of unit, including heat reclaim unit, heat exchanger and heat supply network, heat reclaim unit is arranged between the air preheater of heat power generating system and fume desulfurizing tower, heat reclaim unit carries out heat exchange by heat exchange pipeline and heat exchanger, transfer heat to heat exchanger, carrying out heat exchange between heat exchanger and heat supply network, transfer heat to the recirculated water in heat supply network, heat supply network transfers heat to user.
Described heat reclaim unit is arranged between air preheater and fume desulfurizing tower, neither affects boiler efficiency, again can be with convenient construction.
Preferably, described heat reclaim unit is low low-level (stack-gas) economizer.
The heat that low low-level (stack-gas) economizer reclaims is passed to heat supply network by heat exchanger and heat exchanger channels by the present invention, both the blocking of low low-level (stack-gas) economizer can be prevented effectively from, ensure safe operation of the boiler, facilitate again heat supply network and the maintenance of heat exchanger and maintenance, and heat recovery system arranges fairly simple, setup cost is low, and heat recovery rate is high.
Preferably, described heat reclaim unit is low low-level (stack-gas) economizer.Both can realize the UTILIZATION OF VESIDUAL HEAT IN of flue gas, cigarette temperature can have been reduced again, improve the efficiency of dust collection of desulfurizing tower, reduce water resources consumption.
Preferably, described heat exchange pipeline is circulating line.Circulating line not only can save water resource, it is also possible to is utilized by the recycle heat in recuperated cycle water, reduces the loss of heat.
It is further preferred that arrange heat exchanger water circulating pump on described heat exchange pipeline.Water circulating pump can be that recirculated water provides power, improves the heat exchange efficiency of recirculated water.
Preferably, described heat exchange pipeline also setting up heater, the temperature probe of heater contacts with the recirculated water within heat exchange pipeline.Owing to the flow of flue gas may be too uniform, if the amount of flue gas is very few, it may occur that the phenomenon that heat supply is not enough, now recirculated water can be played the effect of supplementary heating by heater, makes the temperature that the heat supply temperature holding of heat supply network is more consistent.
Preferably, described heat exchange pipeline caliber is DN100mm.
Preferably, described heat exchange pipeline is provided with the water supplement port for carrying out moisturizing.Water supplement port can replenish the recirculated water of loss in heat transfer process, it is ensured that the discharge in circulating line carries out ensure that the stability of heat exchange.
The method utilizing the external heat supply of low low-level (stack-gas) economizer in above-mentioned unit, comprises the steps:
After low low-level (stack-gas) economizer will be located in the waste heat recovery between air preheater and fume desulfurizing tower, transferring heat to heat exchanger by circulating line, and transfer heat to heat supply network by heat exchanger, heat supply network transfers heat to user.
Preferably, the flow velocity of the recirculated water in circulating line is 12-13m/s.
Preferably, the inflow temperature of the recirculated water in circulating line is 103 DEG C, and return water temperature is 62 DEG C.
Preferably, in 300MW unit, the flow of the recirculated water of the heat supply network of heating is 350-360t/h.
Preferably, when the temperature before recirculated water is by heat exchanger heat exchange is less than design temperature 5 DEG C, starts heater, recirculated water is carried out supplementary heating.
The invention has the beneficial effects as follows:
1, in 300MW unit, use the external heating system of low low-level (stack-gas) economizer can heat heat supply network circulating water flow 355.44t/h, reduce and steam turbine is arranged the amount of drawing gas 19t/h, unit coal-burning decreasing value 3.59g/Kw h, realize the UTILIZATION OF VESIDUAL HEAT IN of flue gas, and thermal power plant unit is not affected by the regulative mode of " electricity determining by heat ", cogeneration of heat and power energy-saving effect is made to become apparent from.
2, flue gas can suitably be cooled down by the system of the present invention so that flue gas enters the proper temperature of desulphurization system, makes the water capacity of chimney keep within the limits prescribed, ensure chimney from pull out force, the heat of recovery is utilized simultaneously, improve the utilization rate of the energy, environmental protection.
3, in circulating line, add upper heater, when the temperature of recirculated water is less than design temperature, carry out supplementary heating, it is ensured that the uniformity of heat supply network heat supply.
4, low low-level (stack-gas) economizer transfers heat to heat supply network by heat exchanger, even if the pollutant blocking heat exchanger in heat supply network, also can affect the operation of low low-level (stack-gas) economizer and boiler, it is ensured that the safe operation of boiler.Meanwhile, heat exchanger is relatively independent, maintains easily and overhauls.
5, the system structure of the present invention is simple, and installation cost is relatively low.
Accompanying drawing explanation
Fig. 1 is the structural representation of the system of embodiments of the invention 1；
Fig. 2 is the structural representation of the system of embodiments of the invention 2.
Wherein: 1, boiler, 2, low-level (stack-gas) economizer, 3, air preheater, 4, low low-level (stack-gas) economizer, 5, fume desulfurizing tower, 6, chimney, 7, heat exchange water pump, 8, heat exchanger, 9, circulating line, 10, heat supply network recirculated water, 11, heat user, 12, heater.
Detailed description of the invention:
The present invention will be further described with embodiment below in conjunction with the accompanying drawings:
Embodiment 1
As shown in Figure 1, a kind of 300MW unit uses the system of the external heat supply of low low-level (stack-gas) economizer, low low-level (stack-gas) economizer 4 is installed (before fume desulfurizing tower 5) additional after the air preheater 3 of boiler 1, utilize the recuperated cycle water in the fume afterheat heating heat exchange pipeline 9 after flowing through low-level (stack-gas) economizer 2 and air preheater 3, recuperated cycle water is pressed and delivered in heat exchanger 8 through the water circulating pump 7 of heat exchanger 8, then transferring heat in the recirculated water of heat supply network 10, the recirculated water of heat supply network 10 finally transfers heat to each heat user 11.
Described low low-level (stack-gas) economizer inflow temperature 70 DEG C, leaving water temperature 130.2 DEG C, import cigarette temperature 155 DEG C, export cigarette temperature 120 DEG C, flue gas flow 1655000kg/h, smoke flow resistance 230Pa, current dynamic resistance 2.5bar, heat power 17020kw.
Described heat exchanger water side difference is 5 DEG C.Described heat exchanger water circulating pump design discharge 355.44t/h.Described heat exchanger recirculated water enters low low-level (stack-gas) economizer and absorbs fume afterheat.Described heat supply network recirculated water inflow temperature 106 DEG C, recirculated water return water temperature 65 DEG C.
The method comprise the steps that
Low low-level (stack-gas) economizer 4 is installed (before fume desulfurizing tower 5) additional after the air preheater 3 of boiler 1, utilize the recuperated cycle water in the fume afterheat heating heat exchange pipeline 9 after flowing through low-level (stack-gas) economizer 2 and air preheater 3, heat exchanger recirculated water is in heat exchanger water circulating pump 7 is pressed and delivered to heat exchanger 8, then transferring heat to heat supply network recirculated water 10, heat supply network recirculated water finally transfers heat to each heat user 11.Owing to the inventive method achieves the UTILIZATION OF VESIDUAL HEAT IN of flue gas, arranging extraction for heat supply amount and reduce in steam turbine, unit coal-burning amount reduces, and also achieving thermal power plant unit is not affected by the regulative mode of " electricity determining by heat ".
Embodiment 2
As in figure 2 it is shown, also set up heater 12 on heat exchange pipeline 9, the temperature probe of heater 12 contacts with the recirculated water within heat exchange pipeline 9.Owing to the flow of flue gas may be too uniform, if the amount of flue gas is very few, it may occur that the phenomenon that heat supply is not enough, now recirculated water can be played the effect of supplementary heating by heater, makes the temperature that the heat supply temperature holding of heat supply network is more consistent.
Although the detailed description of the invention of the present invention is described by the above-mentioned accompanying drawing that combines; but the not restriction to invention protection domain; one of ordinary skill in the art should be understood that; on the basis of technical scheme, those skilled in the art need not to pay various amendments that creative work can make or deformation is the most within the scope of the present invention.
Claims (10)
1. the system of external heat supply in a unit, it is characterized in that: include heat reclaim unit, heat exchanger and heat supply network, heat reclaim unit is arranged between the air preheater of heat power generating system and fume desulfurizing tower, heat exchanger carries out heat exchange by heat exchange pipeline and heat reclaim unit, transfer heat to heat exchanger, carrying out heat exchange between heat supply network and heat exchanger, transfer heat to the recirculated water in heat supply network, heat supply network transfers heat to user.
System the most according to claim 1, it is characterised in that: described heat reclaim unit is low low-level (stack-gas) economizer.
System the most according to claim 1, it is characterised in that: described heat exchange pipeline is circulating line；Preferably, described heat exchange pipeline arranges heat exchanger water circulating pump.
System the most according to claim 1, it is characterised in that: also setting up heater on described heat exchange pipeline, the temperature probe of heater contacts with the recirculated water within heat exchange pipeline.
System the most according to claim 1, it is characterised in that: described heat exchange pipeline caliber is DN100mm.
System the most according to claim 1, it is characterised in that: it is provided with the water supplement port for carrying out moisturizing on described heat exchange pipeline.
7. the method for the externally system external heat supply of heat supply in the arbitrary described unit of claim 1-6, it is characterised in that: comprise the steps:
After low low-level (stack-gas) economizer will be located in the waste heat recovery between air preheater and fume desulfurizing tower, transferring heat to heat exchanger by circulating line, and transfer heat to heat supply network by heat exchanger, heat supply network transfers heat to user.
The method of external heat supply the most according to claim 7, it is characterised in that: the flow velocity of the recirculated water in circulating line is 12-13m/s；Or the inflow temperature of the recirculated water in circulating line is 103 DEG C, return water temperature is 62 DEG C.
The method of external heat supply the most according to claim 7, it is characterised in that: in 300MW unit, the flow of the recirculated water of the heat supply network of heating is 350-360t/h.
The method of external heat supply the most according to claim 7, it is characterised in that: when the temperature before recirculated water is by heat exchanger heat exchange is less than design temperature 5 DEG C, starts heater, recirculated water is carried out supplementary heating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610187915.7A CN105823109A (en) | 2016-03-29 | 2016-03-29 | System and method for supplying heat outwards in unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610187915.7A CN105823109A (en) | 2016-03-29 | 2016-03-29 | System and method for supplying heat outwards in unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105823109A true CN105823109A (en) | 2016-08-03 |
Family
ID=56525079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610187915.7A Pending CN105823109A (en) | 2016-03-29 | 2016-03-29 | System and method for supplying heat outwards in unit |
Country Status (1)
| Country | Link |
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| CN (1) | CN105823109A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000291909A (en) * | 1999-04-05 | 2000-10-20 | Mitsubishi Heavy Ind Ltd | Gas-gas heater |
| US20060144043A1 (en) * | 2004-11-29 | 2006-07-06 | Yasuhiro Takeuchi | Heat recovery equipment |
| CN101936522A (en) * | 2010-08-23 | 2011-01-05 | 江苏双良锅炉有限公司 | Low-temperature gas economizer of power station |
| CN203848266U (en) * | 2014-04-29 | 2014-09-24 | 中冶华天南京工程技术有限公司 | Recycling system for waste heat of flue gas of blast furnace gas boiler |
| CN104964265A (en) * | 2015-06-15 | 2015-10-07 | 杭州华电能源工程有限公司 | Energy-saving emission reduction system and energy-saving emission reduction method of horizontal type phase change heat exchanger and front-arrangement type water medium type GGH combined |
| CN205014330U (en) * | 2015-07-31 | 2016-02-03 | 辽宁赛沃斯能效科技股份有限公司 | Modular economizer residual heat from flue gas device and residual heat from flue gas system |
-
2016
- 2016-03-29 CN CN201610187915.7A patent/CN105823109A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000291909A (en) * | 1999-04-05 | 2000-10-20 | Mitsubishi Heavy Ind Ltd | Gas-gas heater |
| US20060144043A1 (en) * | 2004-11-29 | 2006-07-06 | Yasuhiro Takeuchi | Heat recovery equipment |
| CN101936522A (en) * | 2010-08-23 | 2011-01-05 | 江苏双良锅炉有限公司 | Low-temperature gas economizer of power station |
| CN203848266U (en) * | 2014-04-29 | 2014-09-24 | 中冶华天南京工程技术有限公司 | Recycling system for waste heat of flue gas of blast furnace gas boiler |
| CN104964265A (en) * | 2015-06-15 | 2015-10-07 | 杭州华电能源工程有限公司 | Energy-saving emission reduction system and energy-saving emission reduction method of horizontal type phase change heat exchanger and front-arrangement type water medium type GGH combined |
| CN205014330U (en) * | 2015-07-31 | 2016-02-03 | 辽宁赛沃斯能效科技股份有限公司 | Modular economizer residual heat from flue gas device and residual heat from flue gas system |
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| C06 | Publication | ||
| PB01 | Publication | ||
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Application publication date: 20160803 |