CN108413470A - Thermoelectricity decoupled system and its working method based on solid heat accumulation - Google Patents
Thermoelectricity decoupled system and its working method based on solid heat accumulation Download PDFInfo
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- CN108413470A CN108413470A CN201810403327.1A CN201810403327A CN108413470A CN 108413470 A CN108413470 A CN 108413470A CN 201810403327 A CN201810403327 A CN 201810403327A CN 108413470 A CN108413470 A CN 108413470A
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- 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
- F24D11/00—Central heating systems using heat accumulated in storage masses
- F24D11/002—Central heating systems using heat accumulated in storage masses water heating system
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- 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
- F24D2220/00—Components of central heating installations excluding heat sources
- F24D2220/10—Heat storage materials, e.g. phase change materials or static water enclosed in a space
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- Thermal Sciences (AREA)
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- General Engineering & Computer Science (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention discloses a kind of thermoelectricity decoupled system based on solid heat accumulation, including solid heat reservoir, solid heat reservoir is used to store the steam heat of thermoelectricity unit, and can reject heat to heat user；Solid heat reservoir is connected with lower pipeline：Heat source incoming line for importing thermoelectricity unit steam heat；Hydrophobic there is drain discharge pipeline for discharging；Hot net water incoming line, which, which is used to import in the water at low temperature to solid heat reservoir that heat user discharges, carries out heat exchange heating；Hot net water outgoing line, the water after which is used to will heat up are delivered to heat user.Solve the problems, such as that existing decoupling technology economical effect of heat-supply is poor, investment for trnasforming urban land is larger or heat storage can takes up a large area.
Description
【Technical field】
The invention belongs to coal fired power generation cogeneration of heat and power technical fields, and in particular to the thermoelectricity decoupled system based on solid heat accumulation
And its working method.
【Background technology】
Currently, the Power Plant of heat supply is mostly the steam-extracting type unit with condenser, and non-heating season is based on powering, heating
Season meets heating load by extracting a part of exhaust steam in steam turbine, and most thermal power plant units take Steam Turbine Through IP Admission steam discharge
Heat-supplying mode, and limited by turbine low pressure cylinder minimum cooling flow, in the case where unit heating load is certain, unit generation
Load cannot be below a certain limit value, the pattern of this " electricity determining by heat " limit thermal power plant unit heat supply period depth peak regulation energy
Power, this, which is also that China three northern areas of China heating period peak regulation is difficult, abandons wind, abandons the serious major reason of optical phenomenon.Due to for hot season thermoelectricity
The electric load regulating power of coproduction unit declines, and electric load adjusting and heat load adjustment contradiction occurs, in order to solve this
Contradiction needs to break cogeneration units heat-rigid coupled relation of electricity, realizes the electric flexible modulation of heat-.Current main decoupling
Technology has：Turbine by-pass heat supply cuts off low pressure (LP) cylinder heat supply, hot-water cylinder heat accumulation heat supply, electric boiler or electric heating pump heat supply process.
Turbine by-pass technical solution can farthest realize that thermoelectricity decouples, and can reach the effect of " shutting down not blowing out ".
It is disadvantageous in that economical effect of heat-supply is poor.In addition, need accurately to match each road steam flow in conceptual design,
Keep the thrust-balancing of turbine rotor, it is ensured that the safety in operation of high pressure cylinder exhaust stage blade prevents heating surface overtemperature, and also
It is ensured that safety in operation when bypass heat supply, high to design and Operational requirements.
The heat capacity that low pressure cylinder technology can make unit increase by 20% or so on the basis of former heat capacity is cut off, due to
The cold source energy heat-economy for reducing low pressure (LP) cylinder steam discharge is good, but this technology regulating power is limited, and technological means is not also at present
It is overripened, it can not accurately estimate out the long-term influence of " idle running " to unit of turbine low pressure cylinder.
Hot-water cylinder heat-storage technology is to store heat, unit heat supply steam extraction when relatively low as network load by the way that hot-water cylinder is arranged
Supplement or heat storage, indirectly realize thermoelectricity decoupling.Heat storage can heat supply process is few to the transformation of unit original therrmodynamic system, supplies
Heat-economy is preferable, is disadvantageous in that investment for trnasforming urban land is larger, and heat storage can takes up a large area, and is not suitable for long-term continuous tune
Peak.
Electric boiler or electric heating pump heat supply process refer to that electric boiler, electric heating pump etc. is arranged in mains side, are supplied in underload steam extraction
When hot insufficient, thermal energy is converted electrical energy by way of electric heating or electric heat storage, needed for complementary heating, to realize thermal electrolysis
Coupling.The investment in technological transformation is big, and unit heat economy is poor.
【Invention content】
The object of the present invention is to provide a kind of thermoelectricity decoupled systems and its working method based on solid heat accumulation, existing to solve
There is the problem of decoupling technology economical effect of heat-supply is poor, investment for trnasforming urban land is larger or heat storage can takes up a large area.
The technical solution used in the present invention is：Thermoelectricity decoupled system based on solid heat accumulation, including solid heat reservoir,
Solid heat reservoir is used to store the steam heat of thermoelectricity unit, and can reject heat to heat user；
Solid heat reservoir is connected with lower pipeline：Heat source incoming line for importing thermoelectricity unit steam heat；With
Hydrophobic there is drain discharge pipeline in discharging；Hot net water incoming line, the pipeline are used to import the water at low temperature of heat user discharge extremely
Heat exchange heating is carried out in solid heat reservoir；Hot net water outgoing line, the water after which is used to will heat up are delivered to heat user.
Further, further include that water heats heat-exchange system, water heating heat-exchange system heats heat-exchange system by water respectively and goes out
Water pipe and heat supply network return water main pipe are connected to heat user, and are formed into a loop；Water heating heat-exchange system, which is also associated with, imports thermoelectricity unit
The pipeline of steam heat and for discharging hydrophobic pipeline.
Further, solid heat reservoir includes several heat accumulation modules of serial or parallel connection.
Further, heat accumulation module is inorganic non-metallic class solid heat accumulating, is provided with outside each heat accumulation module multigroup
Heat exchanger tube, heat accumulation module and heat exchange outer tube layer are enclosed with insulating layer.
Further, further include thermoelectricity unit, thermoelectricity unit is connected by extraction for heat supply main pipe with heat source incoming line,
Thermoelectricity unit heats heat-exchange system with water by extraction for heat supply main pipe and is connected.
Further, further include thermoelectricity unit, thermoelectricity unit is connected by extraction for heat supply main pipe with heat source incoming line,
Thermoelectricity unit heats heat-exchange system with water by extraction for heat supply main pipe and is connected.
Second of technical solution that the present invention uses is a kind of work side of the thermoelectricity decoupled system based on solid heat accumulation
Method, define heat source incoming line, drain discharge pipeline, heat supply network return water main pipe, hot net water incoming line, hot net water outgoing line and
The valve number being correspondingly arranged on water heating heat-exchange system outlet pipe is K1~K6；
The heat accumulation process of thermoelectricity decoupled system is：Heat accumulation process is：Open valve K1 and valve K2；Extraction for heat supply main pipe will
The excess steam of thermoelectricity unit is delivered to the air inlet of heat reservoir, and heat reservoir is by heat absorption and stores；
Further, the exothermic process of thermoelectricity decoupled system is：Open valve K3, valve K4 and valve K5；By heat user
The cooling hot net water of middle generation flows into water through water pump all the way and heats heat-exchange system, and the heating that exchanges heat in water heats heat-exchange system
After flow into heat user；Another way flows into heat user after heat reservoir heat exchange heating.
The third technical solution that the present invention uses is the thermoelectricity decoupling side of the thermoelectricity decoupled system based on solid heat accumulation
Method adjusts thermoelectricity unit to increase heat supply steam extraction amount in the thermoelectricity unit non-peak regulation period, using solid heat reservoir by extra steaming
Vapour heat storage；In the thermoelectricity peak load regulation period, thermoelectricity unit is adjusted to reduce the supply load of unit, then by solid heat accumulation system
The heat of system storage releases, to make up the heating load of the corresponding reduction of thermoelectricity unit.
The 4th kind of technical solution that the present invention uses is the thermoelectricity decoupling side of the thermoelectricity decoupled system based on solid heat accumulation
Method, in the case where boiler load is constant, by steam by-pass or increases heat supply steam extraction to reduce in the thermoelectricity peak load regulation period
Electric load, then excess steam heat is stored in solid heat reservoir；In the thermoelectricity unit non-peak regulation period, reduces heat supply and take out
Vapour increases online electric load, then the heat that solid heat reservoir stores is released external heat supply.
The invention has the advantages that：The thermoelectricity decoupling method of the present invention takes thermal potential to set flexibly, can be in bleed steam pipework
Side, can also be in heat supply network heat exchange side, and peak regulation method is various, and adaptability is extensive, has, heat economy small to thermoelectricity unit security implication
The features such as property is good, and access system and installation site are flexible, and O＆M is low-cost.
【Description of the drawings】
Fig. 1 is the connection diagram of the thermoelectricity decoupled system the present invention is based on solid heat accumulation；
Fig. 2 is that the present invention is based on the thermoelectricity decoupled systems of solid heat accumulation to be run in non-heat accumulation peak regulation peak regulation period, heat release period
Tactful schematic diagram；
Fig. 3 is that the present invention is based on the thermoelectricity decoupled systems of solid heat accumulation in the non-peak regulation period heat accumulation operation of peak regulation period heat release
Tactful schematic diagram.
In figure, 1. extraction for heat supply main pipes, 2. solid heat reservoirs, 3. heat users, 4. water pumps, 5. water heating heat-exchange system,
6. hydrophobic main pipe.
【Specific implementation mode】
The structural principle and operation principle of the present invention are described further below in conjunction with the accompanying drawings.
The present invention provides a kind of thermoelectricity decoupled systems based on solid heat accumulation, as shown in Figure 1, including the pumping of thermoelectricity unit
Vapour heat supply main pipe 1, solid heat reservoir 2, heat user 3, pumps for hot water supply net 4, water heating heat-exchange system 5, hydrophobic main pipe 6.
Solid heat reservoir 2 is used to store the steam heat of thermoelectricity unit, and can reject heat to heat user 3；Solid
Heat reservoir 2 is connected with lower pipeline：Heat source incoming line for importing thermoelectricity unit steam heat；It is hydrophobic for discharging
There is drain discharge pipeline；Hot net water incoming line, the pipeline are used to import the water at low temperature of the discharge of heat user 3 to solid heat reservoir
Heat exchange heating is carried out in 2；Hot net water outgoing line, the pipeline is for conveying the water after solid heat reservoir 2 exchanges heat heating
To heat user 3.
Water heating heat-exchange system 5 heats heat-exchange system outlet pipe by water respectively and heat supply network return water main pipe is connected to heat user
3, and be formed into a loop；Water heating heat-exchange system 5, which is also associated with, imports the pipeline of thermoelectricity unit steam heat and thin for discharging
The pipeline of water.Thermoelectricity unit is connected by extraction for heat supply main pipe 1 with heat source incoming line, and thermoelectricity unit passes through extraction for heat supply mother
Pipe 1 is connected with water heating heat-exchange system 5.
Specifically, extraction for heat supply main pipe 1 is connected to the entrance of solid heat reservoir 2, solid storage by heat source incoming line
The outlet of hot systems 2 is through drain discharge pipeline connection to hydrophobic main pipe 6；Heat supply network return water main pipe is connected to by hot net water incoming line
To solid heat reservoir 2, solid heat reservoir 2 is connected to heat user 3 through hot net water outgoing line；Solid heat reservoir 2 is used for
The extra steam heat of thermoelectricity unit is stored, and rejects heat to heat user 3；
Extraction for heat supply main pipe 1 is also connected to water heating heat-exchange system 5 steam inlet, water heat heat-exchange system 5 it is hydrophobic go out
Mouth pipeline is connected to hydrophobic main pipe 6, and water heating 5 hot net water outlet of heat-exchange system to heat supply network water main pipe flows through heat user 3,
Water heating 5 heat supply network water inlet of heat-exchange system is connect with heat supply network return water main pipe；It is provided in heat supply network return water main pipe for providing heat supply network
The water pump 4 of Water circulation hydrodynamics；
Heat source incoming line, drain discharge pipeline, heat supply network return water main pipe, hot net water incoming line, hot net water outgoing line
With the valve for being both provided with control place pipeline closure on water heating heat-exchange system outlet pipe.
Solid heat reservoir 2 includes multigroup solid heat accumulation wired in parallel or is composed in series, and heat accumulation module is by inorganic non-metallic
The heat exchanger tube of class solid heat accumulating and multigroup 20~150mm of diameter constitute, the heat exchanger tube import in the block of heat accumulation mould all with into
Mouth header connection, outlet are connect with outlet header, system outer layer covers insulating layer.Solid heat reservoir and the heat exchange of heat supply network side water add
Hot systems are connected with parallel way, absorb the waste heat that thermoelectricity unit generates in power grid peak period, and in power grid low ebb
Waste heat is supplemented to thermoelectricity unit；Or waste heat is stored in hot low-valley interval, and release storage in hot peak period
Heat.Solid heat reservoir 2, for absorbing the waste heat that thermoelectricity unit generates in power grid peak period, and in power grid low ebb
When waste heat is supplemented to thermoelectricity unit；Or for storing waste heat in hot low-valley interval, and released in hot peak period
The heat of storage.
When designing thermoelectricity decoupled system heat supply, it is necessary first to determine the capacity of operation reserve and solid heat reservoir 2.According to
Unit steam steam extraction parameter and the typical day heat supply of unit, supply load curve analyze heat of the unit in regional network, electricity
Load conflict period and peak capacity demand, the operation reserve of unit is determined according to the data of analysis, finally estimates solid
The capacity of heat reservoir 2.
Two, the present invention proposes a kind of working method of the thermoelectricity decoupled system based on solid heat accumulation：
Define heat source incoming line, drain discharge pipeline, heat supply network return water main pipe, hot net water incoming line, hot net water export
The valve number being correspondingly arranged on pipeline and water heating heat-exchange system outlet pipe is K1~K6；
The heat accumulation process of system is：Heat accumulation process is：Open valve K1 and valve K2 closes valve K3, valve K4 and valve
Door K5；The excess steam of thermoelectricity unit is delivered to the air inlet of solid heat reservoir 2, solid heat accumulation system by extraction for heat supply main pipe 1
System 2 is by heat absorption and stores, and what is generated in solid heat reservoir 2 is hydrophobic from the discharge of hydrophobic main pipe 6.
The exothermic process of system is：Close valve K1 and valve K2, Open valve K3, valve K4 and valve K5；Heat is used
The cooling hot net water generated in family 3 flows into water through water pump 4 all the way and heats heat-exchange system 5, and changed in water heats heat-exchange system 5
Heat user 3 is flowed into after heat heating；Another way flows into heat user 3 after the heat exchange heating of solid heat reservoir 2.
The solid heat reservoir 2 of thermoelectricity decoupled system based on solid heat accumulation takes thermal potential to set flexibly, you can be supplied from unit
Steam introduces solid heat reservoir to hot steam extraction head point all the way, can also introduce steam from heat supply network spike bleed steam pipework, be suitable for
110 DEG C~550 DEG C of heat source temperature range；Hydrophobic returnable heat motor group oxygen-eliminating device, hydrophobic after the heat exchange of solid energy storage system
The equipment such as flash vessel are reused.
Current main decoupling technology has turbine by-pass heat supply, cuts off low pressure (LP) cylinder heat supply, hot-water cylinder heat accumulation heat supply, grill pan
Stove or electric heating pump heat supply process.But all there is a problem of it is such or such, such as：, adjusting energy high to design and Operational requirements
Power is limited not to be suitable for long-term continuous peak regulation or unit heat economy is poor.Using the present invention is based on the thermoelectricity of solid heat accumulation
Decoupled system, it is small in unit thermal loads after increasing solid heat reservoir 2, or when power supply electric load is big, unit confession can be increased
Hot rate of air sucked in required, extra heat supply heat storage is in heat reservoir；When unit needs to reduce electric load, reduce unit output,
The heat supply heat of the corresponding reduction of unit, is undertaken by solid heat reservoir 2.Coordinate thermoelectricity unit not by solid heat reservoir 2
With period storing discharging heat, thermoelectricity unit is made to realize the purpose of thermal electrolysis lotus root.Moreover, thermoelectricity decoupling system that should be based on solid heat accumulation
System and working method have peak regulation method it is various, adaptability is extensive, have it is small to thermoelectricity unit security implication, heat-economy is good,
The features such as access system and installation site are flexible, and O＆M is low-cost.
Three, the present invention proposes a kind of thermoelectricity decoupling method of the thermoelectricity decoupled system based on solid heat accumulation.
First method：In the thermoelectricity unit non-peak regulation period, thermoelectricity unit is adjusted to increase heat supply steam extraction amount, utilizes solid
Heat reservoir 2 is by excess steam heat storage；In the thermoelectricity peak load regulation period, it is negative to reduce the power supply of unit to adjust thermoelectricity unit
Lotus, then the heat that solid heat reservoir 2 stores is released, to make up the heating load of the corresponding reduction of thermoelectricity unit.
Second method：In the thermoelectricity peak load regulation period, in the case where boiler load is constant, pass through steam by-pass or increasing
Add heat supply steam extraction to reduce electric load, then excess steam heat is stored in solid heat reservoir 2；In the non-peak regulation of thermoelectricity unit
Period reduces heat supply steam extraction, increases online electric load, then the heat that solid heat reservoir 2 stores is released external heat supply.
For the cogeneration units that peak regulation period heating demand is relatively full, it is suitble to choose the non-peak regulation period heat accumulation of power grid
Peak regulation period exothermic operation reserve, has thermic load the cogeneration units of surplus, is suitble to the selection peak load regulation network period more
The operation reserve of the multiple electricity of the non-peak regulation period heat release of steam pumping heat accumulation.
It is the key that one of heat accumulation peak regulation system success or failure that solid heat reservoir 2, which takes the selection of heat/heat release position, steam power plant
Heating system is made of heat source, heat supply network and heat user three parts, and higher temperature advantage can be stored according to solid heat reservoir,
It is best in heat source side installation.
Steam power plant is exactly the heat source of heating system, and by taking steam-extracting type unit as an example, steam-extracting type thermoelectricity unit is according to steam turbine class
Type is generally divided into 2 kinds, and one kind is that extraction turbine heating system is adjusted in low pressure, and extraction pressure is 0.12~0.25MPa, more
For the domestic heating of urban area property；Another kind is that extraction turbine heating system, extraction pressure 0.78 is adjusted in high and low pressure
~1.27MPa and 0.12~0.25MPa is chiefly used in industrialized regions, while taking into account production and life heat supply.To change to thermoelectricity unit
Minimum starting point is moved, form design in parallel or in series may be used near existing heat exchanger in solid heat reservoir 2.
As shown in Figure 1, by heat supply network heat exchanger, the wave of heating demand when thermoelectricity unit being coordinated to adjust electric load
It is dynamic, thermoelectricity unit waste heat is absorbed, or to heat supply network additional heat, achievees the purpose that thermoelectricity decouples.
Claims (10)
1. the thermoelectricity decoupled system based on solid heat accumulation, which is characterized in that including solid heat reservoir (2), the solid heat accumulation
System (2) is used to store the steam heat of thermoelectricity unit, and can reject heat to heat user (3)；
The solid heat reservoir (2) is connected with lower pipeline：Heat source incoming line for importing thermoelectricity unit steam heat；
Hydrophobic there is drain discharge pipeline for discharging；Hot net water incoming line, the pipeline are used to import the low temperature of heat user (3) discharge
Heat exchange heating is carried out in water to the solid heat reservoir (2)；Hot net water outgoing line, the water after which is used to will heat up are defeated
It send to heat user (3).
2. thermoelectricity decoupled system as described in claim 1, which is characterized in that further include water heating heat-exchange system (5), the water
Heating heat-exchange system (5) heats heat-exchange system outlet pipe by water respectively and heat supply network return water main pipe is connected to heat user (3), and shape
At circuit；Water heating heat-exchange system (5) is also associated with the pipeline for importing thermoelectricity unit steam heat and thin for discharging
The pipeline of water.
3. the thermoelectricity decoupled system based on solid heat accumulation as claimed in claim 1 or 2, which is characterized in that the solid heat accumulation
System (2) includes several heat accumulation modules of serial or parallel connection.
4. the thermoelectricity decoupled system based on solid heat accumulation as claimed in claim 5, which is characterized in that the heat accumulation module is nothing
Machine non-metal kind solid heat accumulating, each heat accumulation module are provided with multigroup heat exchanger tube outside, and heat accumulation module and heat exchange outer tube layer are equal
It is enclosed with insulating layer.
5. the thermoelectricity decoupled system based on solid heat accumulation as claimed in claim 1 or 2, which is characterized in that further include thermoelectric perpetual motion machine
Group, the thermoelectricity unit are connected by extraction for heat supply main pipe (1) with heat source incoming line, and the thermoelectricity unit is supplied by steam extraction
Hot main pipe (1) is connected with water heating heat-exchange system (5).
6. the thermoelectricity decoupled system based on solid heat accumulation as claimed in claim 3, which is characterized in that further include thermoelectricity unit,
The thermoelectricity unit is connected by extraction for heat supply main pipe (1) with heat source incoming line, and the thermoelectricity unit passes through extraction for heat supply
Main pipe (1) is connected with water heating heat-exchange system (5).
7. such as the working method of any one thermoelectricity decoupled system based on solid heat accumulation in claim 1-6, which is characterized in that
Define the heat source incoming line, drain discharge pipeline, heat supply network return water main pipe, hot net water incoming line, hot net water outgoing line
It is K1~K6 with the valve number being correspondingly arranged on water heating heat-exchange system outlet pipe；
The heat accumulation process of thermoelectricity decoupled system is：Heat accumulation process is：Open valve K1 and valve K2；The extraction for heat supply main pipe
(1) excess steam of thermoelectricity unit is delivered to the air inlet of heat reservoir (2), heat reservoir (2) is by heat absorption and stores.
8. a kind of working method of the thermoelectricity decoupled system based on solid heat accumulation as claimed in claim 7, which is characterized in that heat
The exothermic process of electrolysis coupling system is：Open valve K3, valve K4 and valve K5；The cooling heat supply network that will be generated in heat user (3)
Water flows into water heating heat-exchange system (5) through water pump (4) all the way, and flows into heat after heat exchange heating in water heating heat-exchange system (5)
User (3)；Another way flows into heat user (3) after heat reservoir (2) heat exchange heating.
9. the thermoelectricity decoupling side based on the thermoelectricity decoupled system based on solid heat accumulation described in any one in claim 1-6
Method, which is characterized in that in the thermoelectricity unit non-peak regulation period, adjust thermoelectricity unit to increase heat supply steam extraction amount, utilize solid heat accumulation
System (2) is by excess steam heat storage；In the thermoelectricity peak load regulation period, it is negative to reduce the power supply of unit to adjust thermoelectricity unit
Lotus, then the heat that the solid heat reservoir (2) stores is released, to make up the heating load of the corresponding reduction of thermoelectricity unit.
10. the thermoelectricity decoupling side based on the thermoelectricity decoupled system based on solid heat accumulation described in any one in claim 1-6
Method, which is characterized in that in the thermoelectricity peak load regulation period, in the case where boiler load is constant, by steam by-pass or increase confession
Hot steam extraction is stored in reduce electric load, then by excess steam heat in solid heat reservoir (2)；In the non-peak regulation of thermoelectricity unit
Section reduces heat supply steam extraction, increases online electric load, then the heat that the solid heat reservoir (2) stores is released external confession
Heat.
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| CN110425627A (en) * | 2019-08-30 | 2019-11-08 | 华能国际电力股份有限公司 | Coal-fired boiler bottom slag waste heat storage and utilization integrated system and method |
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