CN206439807U - Wide load high-efficiency feedwater heat regenerative system - Google Patents

Wide load high-efficiency feedwater heat regenerative system Download PDF

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Publication number
CN206439807U
CN206439807U CN201621339322.XU CN201621339322U CN206439807U CN 206439807 U CN206439807 U CN 206439807U CN 201621339322 U CN201621339322 U CN 201621339322U CN 206439807 U CN206439807 U CN 206439807U
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heater
final stage
steam
feedwater
water heater
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刘志祥
牛序娟
胡佳良
姜腾飞
陈心烨
姜殷锷
刘晓亮
戴华
季益山
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Shanghai Electric Power Generation Equipment Co Ltd
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Shanghai Electric Power Generation Equipment Co Ltd
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Abstract

The utility model discloses a kind of wide load high-efficiency feedwater heat regenerative system, including the multiple stage heater being sequentially connected in series along feedwater piping, it is connected at the top of two heaters of lower level with steam turbine high-pressure cylinder, it is connected at the top of other heaters with Steam Turbine Through IP Admission, it is characterized in that, also include final stage feed-water heater, next stage of the final stage feed-water heater located at the heater of lowermost level on feedwater piping, it is connected at the top of final stage feed-water heater by jet chimney after filling valve with steam turbine high-pressure cylinder, final stage feed-water heater bottom connects the heater of lowermost level by drain water piping one or connects secondary rudimentary heater by drain water piping two.The utility model be it is a kind of can maintain or improve the effective measures of feed temperature under unit low load condition, so that the unit feature of environmental protection, economy and security are improved, as a kind of wide load heat regenerative system.

Description

Wide load high-efficiency feedwater heat regenerative system
Technical field
The utility model is related to a kind of water supply heat back system available for wide load condition, for Turbo-generator Set.
Background technology
The natural endowment of China's primary energy is the few oily lean gas of many coals, and rich coal resources, energy residue can adopt gross reserves Central Plains Coal accounts for 58.8%, and coal accounts for China's total output of primary energy 75%, accounts for total quantity consumed 70%, determines energy of the China based on coal Source utilizes general layout by long-term existence.Energy supply sustainable growth based on coal electricity, also exists for the economic fast and stable development of China There is competitiveness in the world, keep rational development cost to provide necessary condition, be China's energy resources natural endowment and industry Change the inevitable outcome of development.
" 13 " planning draft proposes to build modern energy system, by " Coal Clean is efficiently utilized, complete to coal unit Implement minimum discharge and reducing energy consumption in face " it is classified as one of big key project of energy field eight.Proposed in draft, implement coal electricity energy-conservation Emission reduction and upgrading action plan, minimum discharge and reducing energy consumption are implemented in full to coal unit.With air environmental pollution Problem is outstanding day by day, and people are also more and more high for the requirement of environmental protection.Point out that China will be big in national energy-saving emission reduction planning Push into power industry desulphurization denitration.Domestic some regulations require that unit needs to meet wide load denitration operation.Many places Policy Conditions, the electricity power enterprise not up to standard of the emission reduction to NOx is reduced subsidy, cancels subsidy or even impose a fine.Therefore, this patent The wide load denitration technology of proposition is necessary.
Coal fired thermal power plant is pollutant emission monitoring rich and influential family again, the flue gas desulfurization of thermal power plant, denitration oneself " energy-conservation that turns into China One important process of emission reduction ".For denitration technology, current SCR methods (selective catalytic reduction) are in the world using most A kind of many, technology most ripe gas denitrifying technology.But SCR method denitrations are used, when unit is in underload(60% rated load Below)When operation, the reactor inlet temperature of SCR denitration system drops below the operating temperature interval of catalyst, SCR Denitrating system is out of service.The present situation of peak regulation to be participated according to the current Large-scale fire-electricity unit of China, unit needs in low at any time Load operating region.Thus under existence conditions, denitrating system utilization rate is not high, and therefore unit Environmental Protection Level also gives a discount Button.
Existing water supply heat back system is as shown in figure 1, the multiple stage heater including being sequentially connected in series along feedwater piping 12, figure It is three, i.e., No. one heater 6, No. two heaters 7 and No. three heaters 8 in 1(By the priority to current direction boiler of heater Order is numbered), two rudimentary heaters(I.e. No. one heater 6 and No. two heaters 7)Top and steam turbine high-pressure cylinder 1 Connection, a senior heater(I.e. No. three heaters 8)Top is connected with Steam Turbine Through IP Admission 2, Steam Turbine Through IP Admission 2, vapour Steam flow direction of the turbine high pressure cylinder 1 along main steam line 9 is connected in series, and the end of main steam line 9 is final stage jet chimney 10;Each bottom of heater is connected with the heater of its upper level, five-star heater(I.e. No. three heaters 8)Bottom It is connected with final hydrophobic outlet 15.When unit is in underload, extraction pressure reduction, correspondence feed temperature reduction causes pot The average endothermic temperature reduction of stove, so as to reduce the thermodynamic cycle thermal efficiency of unit, reduces unit economy, equal generated energy Under, the pollutant discharge amount corresponding to the low unit of efficiency wants relative increase.Thus how feedwater is improved in unit underload Temperature, this is the current key issue for realizing wide load denitration.
The content of the invention
To be solved in the utility model is that unit is in the problem of denitrating system needs to stop transport under running on the lower load, simultaneously Improve the underload economy of unit.
In order to solve the above problems, the utility model provides a kind of wide load high-efficiency feedwater heat regenerative system, including edge is given It is connected at the top of the multiple stage heater that waterpipe is sequentially connected in series, two heaters of lower level with steam turbine high-pressure cylinder, it is other It is connected at the top of heater with Steam Turbine Through IP Admission, the steam flowing of Steam Turbine Through IP Admission, steam turbine high-pressure cylinder along main steam line Direction is connected in series, and main steam line end is final stage jet chimney, the bottom of each heater and the heater of its upper level Connection, the bottom of five-star heater is connected with final hydrophobic outlet, it is characterised in that also including final stage feed-water heater, The final stage feed-water heater is located at the next stage of the heater of lowermost level on feedwater piping, and final stage feed-water heater top passes through Jet chimney is connected with steam turbine high-pressure cylinder after filling valve, and final stage feed-water heater bottom connects lowermost level by drain water piping one Heater or time rudimentary heater is connected by drain water piping two.
Preferably, jet chimney is provided with steam control valve, check (non-return) valve after the filling valve.Steam control valve, which is arranged on, to be increased If the final stage jet chimney on, for the steam in the final stage jet chimney to be adjusted, the steam can be kept Pressure after regulating valve is basically unchanged in varying duty, and by being given described in the final stage feed-water heater maintenance boiler The temperature of water meets the requirement that puts into operation of denitrating system.
Preferably, jet chimney is connected with steam turbine high-pressure cylinder, final stage jet chimney respectively after the filling valve, and final stage is steamed Steam pipe road is provided with filling valve, do not done also by filling valve a part of steam of work(by final stage jet chimney into final stage to Water heater, the feedwater to further heating boiler.
Preferably, it is connected in series with three-level heater on the feedwater piping.
Preferably, the feedwater piping two ends are connected in parallel to system bypass.
Preferably, the final stage feed-water heater is also connected on condenser, emergent drain pipeline by emergent drain pipeline Provided with emergency drain valve.
The utility model proposes the efficient heat regenerative system of wide load, can reach two targets.One is by by this engineering vapour The high parameter vapour source of turbine introduces heater, improves the feed temperature of unit running on the lower load, feed temperature is returned close to optimal Hot temperature, so as to increase therrmodynamic system backheat amount, improves efficiency of thermal cycle, reduces unit net coal consumption rate;Two be when unit is negative When lotus is low, feed temperature, and then flue-gas temperature when effectively improving underload after economizer are improved, and can ensure that SCR exists High efficient district in catalyst is run in wide load range, effectively prevent exiting in underload denitrification apparatus, so then While being contributed for energy-saving and emission-reduction, also save corresponding charges for disposing pollutants and use.
The utility model provide the efficient heat regenerative system of wide load be one kind can be maintained under unit low load condition or The effective measures of feed temperature are improved, so that the unit feature of environmental protection, economy and security are improved, as a kind of wide load backheat system System.Compared with prior art, the utility model has advantages below and technique effect:
(1)Because under different load, average feed temperature can remain basically identical, thus at low load, to water temperature Degree is relative to be significantly improved, flue-gas temperature also relative rise after economizer, is reacted accordingly even when entering denitrating system at low load The entrance flue gas temperature of device is still higher, the operating temperature of catalyst can be made still in normal interval, this can make denitrating system(SCR) No longer need out of service, substantially increase the utilization rate of denitrating system, be obviously improved the Environmental Protection Level of unit.
(2)In underrun, regenerative steam amount is added, cold source energy is reduced;Feed temperature is relative to be improved, and is carried The high average endothermic temperature of boiler;So that unit thermal efficiency of cycle is improved.In addition, the increase of regenerative steam, corresponding to increase The main steam flow under equal load is added, for the unit of sliding pressure operation, main steam pressure relative can also be improved, therefore average suction Hot temperature is also accordingly improved, and unit efficiency is also improved.Obvious load is lower, the relative benefit obtained of this utility model technology It is bigger.With the continuous improvement of unit parameter, the effective enthalpy drop of unit drawn gas also accordingly is improved so that produced by the utility model Marginal benefit increase.It is therefore proposed that a kind of efficient heat regenerative system of wide load, the discharge of pollutant, is carried when reducing unit operation The feature of environmental protection and economy during high variable load operation.
Brief description of the drawings
Fig. 1 is the connection diagram of existing water supply heat back system;
A kind of connection diagram for wide load high-efficiency feedwater heat regenerative system that Fig. 2 provides for the utility model.
Embodiment
To become apparent the utility model, hereby with preferred embodiment, and accompanying drawing is coordinated to be described in detail below.
Embodiment
As shown in Fig. 2 the wide load high-efficiency feedwater heat regenerative system provided for the utility model, including along feedwater piping 12 according to The secondary three-level heater being connected in series, two heaters of lower level(I.e. No. one heater 6 and No. two heaters 7)Top and vapour Turbine high pressure cylinder 1 is connected, and No. three tops of heater 8 are connected with Steam Turbine Through IP Admission 2, are pressed in steam turbine high-pressure cylinder 1 and steam turbine Cylinder 2 is connected with main steam line 9, and the bottom of each heater is connected with the heater of its upper level, five-star heater Bottom is connected with final hydrophobic outlet 15.The utility model sets up a steaming on the basis of original heat regenerative system after filling valve 3 The higher steam port of steam pressure and corresponding jet chimney --- jet chimney 11 after filling valve, and set up final stage feed-water heater 5. By steam after final stage jet chimney 10 and filling valve 3, jet chimney after filling valve is introduced before into steam turbine high-pressure cylinder 1 11, the steam into final stage feed-water heater 5 is controlled using filling valve 3 and steam control valve 4, to heat feedwater.Filling Non-return valve 17 is also provided with valve jet chimney 11, is guaranteed system security.The hydrophobic of the discharge of top heater 5 passes through drain pipe Road 1 enters a heater 6 or enters No. two heaters 7 by drain water piping 14.Feedwater passes through feedwater piping by oxygen-eliminating device 12 flow through No. three heaters 8, No. two heaters 7, heater 6, a final stage feed-water heaters 5 step by step, finally flow to boiler.Mend The 4 pairs of steam for flowing into final stage feed-water heater 5 of steam control valve door installed after steam valve on jet chimney 11 are adjusted, logical The pressure after steam regulation can be kept to be basically unchanged in the range of normal load variations, to maintain feed temperature to meet denitrification apparatus Put into operation requirement.
Final stage feedwater heating steam:The heating vapour source of final stage feed-water heater 5 uses and is introduced into high pressure cylinder after filling valve 3 The steam of acting.The corresponding steam parameter of the interface of filling valve 3 is that final stage feed-water heater 5 provides an available vapour source, Final stage feed-water heater 5, the steam set after filling valve on jet chimney 11 are just put into when being less than 75%THA in view of operating mode The valve group collective effect arranged in regulating valve 4, with filling valve 3 and main steam line 9, in performing low-load running of machine set by steam Final stage feed-water heater 5 is introduced, further heating feedwater, to control the optimum feed temperature into economizer import.
Simultaneously in view of the thermal stress of reduction final stage feed-water heater, system bypass 16 is set on main feed water pipe road 12, In unit operation, final stage feed-water heater 5 is exited during more than 75%THA or less than 40%THA, and the steam in system bypass 16 can So that the shell-side of final stage feed-water heater 5 is in pressurising state, the warm-up mode of final stage feed-water heater 5 is kept.When underload fortune During row, load is less than 75%THA and more than 40%THA, is drawn gas by the regulation of steam control valve 4 on jet chimney 11 after filling valve Pressure and the amount of drawing gas.When unit operating mode reaches 75%THA, the valve group corresponding with main steam line 9 of steam off regulating valve 4, By the system bypass 16 set on feedwater piping 12, the warm-up mode of final stage feed-water heater 5 is kept.
Final feed temperature is reduced and reduced with a steam pumping pressure under conventional power unit running on the lower load, and wide load is efficiently returned Hot systems set up final stage feed-water heater 5, improve feed temperature under partial load condition.Running on the lower load final feed temperature energy Enough average about 30 DEG C of raisings.
Final stage feed-water heater 5 is hydrophobic:Final stage feed-water heater 5 sets two-way hydrophobic respectively, be respectively it is normal hydrophobic and Emergent drain.Wherein emergent drain is discharged into condenser through emergency drain valve and pipeline.It is normally hydrophobic to have two schemes:First Scheme is to enter a heater 6 by drain water piping 1;Second scheme is to enter No. two by drain water piping 2 14 to add Hot device 7.
The energy consumption comparison for the water supply heat back system that former water supply heat back system is provided with the utility model is as shown in table 1.
Table 1

Claims (6)

1. a kind of wide load high-efficiency feedwater heat regenerative system, including along feedwater piping(12)The multiple stage heater being sequentially connected in series, Two heaters top of lower level and steam turbine high-pressure cylinder(1)Connection, other heaters tops and Steam Turbine Through IP Admission(2)Even Connect, Steam Turbine Through IP Admission(2), steam turbine high-pressure cylinder(1)Along main steam line(9)Steam flow direction be connected in series, it is main steam Steam pipe road(9)End is final stage jet chimney(10), the bottom of each heater is connected with the heater of its upper level, highest Heater bottom and final hydrophobic outlet(15)Connection, it is characterised in that also including final stage feed-water heater(5), it is described Final stage feed-water heater(5)Located at feedwater piping(12)The next stage of the heater of upper lowermost level, final stage feed-water heater(5)Top Portion passes through jet chimney after filling valve(11)With steam turbine high-pressure cylinder(1)Connection, final stage feed-water heater(5)Bottom passes through hydrophobic Pipeline one(13)Connect the heater of lowermost level or pass through drain water piping two(14)The rudimentary heater of connection time.
2. width load high-efficiency feedwater heat regenerative system as claimed in claim 1, it is characterised in that jet chimney after the filling valve (11)It is provided with steam control valve(4), check (non-return) valve(17).
3. width load high-efficiency feedwater heat regenerative system as claimed in claim 1 or 2, it is characterised in that steam after the filling valve Pipeline(11)Respectively with steam turbine high-pressure cylinder(1), final stage jet chimney(10)Connection, final stage jet chimney(10)It is provided with filling Valve(3), by filling valve(3)A part of steam for not doing work(also enters final stage feed-water heater by final stage jet chimney (5), the feedwater to further heating boiler.
4. width load high-efficiency feedwater heat regenerative system as claimed in claim 1, it is characterised in that the feedwater piping(12)Upper string Connection is connected with three-level heater.
5. width load high-efficiency feedwater heat regenerative system as claimed in claim 1, it is characterised in that the feedwater piping(12)Two ends It is connected in parallel to system bypass(16).
6. the wide load high-efficiency feedwater heat regenerative system as described in any one in claim 1,2,4 and 5, it is characterised in that institute State final stage feed-water heater(5)Condenser is also connected by emergent drain pipeline, emergent drain pipeline is provided with emergency drain valve.
CN201621339322.XU 2016-12-07 2016-12-07 Wide load high-efficiency feedwater heat regenerative system Active CN206439807U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106705019A (en) * 2016-12-07 2017-05-24 上海电气电站设备有限公司 Wide-load efficient water supply regenerative system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106705019A (en) * 2016-12-07 2017-05-24 上海电气电站设备有限公司 Wide-load efficient water supply regenerative system

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