CN206320726U - A kind of thermal power plant's tail flue gas afterheat utilizing system coupled based on machine stove depth - Google Patents
A kind of thermal power plant's tail flue gas afterheat utilizing system coupled based on machine stove depth Download PDFInfo
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 239000003546 flue gas Substances 0.000 title claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 77
- 239000007789 gas Substances 0.000 claims abstract description 47
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- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims 1
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Abstract
The utility model discloses a kind of thermal power plant's tail flue gas afterheat utilizing system coupled based on machine stove depth, it is related to boiler of power plant tail flue gas field of waste heat utilization, the bypass flue in parallel with air preheater is set after the outlet of boiler SCR denitration equipment, the high-pressure economizer exchanged heat with high-pressure feed water loop is sequentially provided with bypass flue, and the low-pressure coal saver exchanged heat with condensate circuit, air preheater, which is exported, arranges low-level (stack-gas) economizer and the first and second wind system heat exchange of supply burner hearth primary and secondary air in the flue after converging.The utility model uses the thought of cascaded utilization of energy, compared with boiler is not provided with air preheater bypass, in the case where ensureing that air heat absorption is constant, reduce air preheater bypass low pressure condensate water heat absorption, the heat absorption that air preheater bypasses high-pressure feed water is improved, the utilization ratio of boiler tail flue gas waste heat is improved.
Description
Technical field
The utility model is related to boiler of power plant tail flue gas field of waste heat utilization.
Background technology
Implemented by the requirement of central three ministries and commissions《The General Office of the State Council is on printing and distributing energy development Strategic Action Plan
The notice of (2014-the year two thousand twenty)》(Office of the State Council sends out (2014) No. 31) requires, accelerates to promote production of energy and consumption revolution.To 2020
Year, average net coal consumption rate is less than 310 grams/kilowatt hour after the transformation of active service Thermal generation unit, wherein 600,000 kilowatts of active service and more than
Average net coal consumption rate is less than 300 grams/kilowatt hour after unit (in addition to Air-cooled Unit) transformation.Dust, SO2, NOx emission concentration 10,
35、50mg/Nm3(minimum discharge), country is more and more strict to the energy consumption of coal-fired power plant and the requirement of discharge.
Heat loss due to exhaust gas is maximum in coal burning boiler of power station various heat losses one, typically 5%~8%.Generally, arrange
Cigarette temperature often reduces by 20 DEG C, and heat loss due to exhaust gas reduces 0.6%~1.0%, and annual mark coal consumption decreases 3~4g/ (kW
h).In addition, exhaust gas temperature is reduced, actual exhaust gas volumn is reduced, and the ratio resistance reduction of dust, the efficiency of electric precipitation is improved, air-introduced machine
Power consumption reduce；For wet desulfurization system, the reduction of inlet flue gas temperature can reduce desulfurization water consume, improve desulfuration efficiency.
Boiler tail flue gas residual-heat utilization technology can effectively utilize the heat of exhaust gas temperature, reduce exhaust gas temperature, reduce
Flue gas loss, saves coal consumption.The most frequently used mode is the tail after air preheater in traditional fume afterheat Land use systems
Low-level (stack-gas) economizer is arranged in portion's flue, the condensed water of heat regenerative system is heated using fume afterheat, to reduce drawing gas for heat regenerative system
Amount；Drawing gas for saving continues expansion work into follow-up steam turbine, the total output work increase of steam turbine, so as to improve whole unit
Economy.In another fume afterheat Land use systems, generally, air preheater bypass flue gas feedwater absorbs the remaining of flue gas
Heat is drawn gas to substitute, and drawing gas for exclusion continue acting in steam turbine downstream, so as to improve the overall economy quality of unit.Air preheat
The exhaust gas temperature of device exhaust gas temperature and air preheater bypass flue is consistent, about 120 DEG C or so.But the current technical scheme
Cold wind is heated using steam turbine exhaust steam or steam turbine condensate, is not taken into full account the heat transfer of waste heat recovery is pre- to air
Hot device intake air so that the fume afterheat of recovery can not be utilized with peak efficiency.And use steam turbine exhaust steam or condensation
Water has that exhaust steam insufficient pressure, drain recovery difficulty are big and break the low adding system of steam turbine to heat cold wind.
Utility model content
The purpose of this utility model is：Propose a kind of thermal power plant's tail flue gas UTILIZATION OF VESIDUAL HEAT IN coupled based on machine stove depth
System, using the thought of cascaded utilization of energy, compared with boiler is not provided with air preheater bypass, is ensureing that air heat absorption is constant
In the case of, air preheater bypass low pressure condensate water heat absorption is reduced, the heat absorption that air preheater bypasses high-pressure feed water is improved, carries
The utilization ratio of high boiler tail flue gas waste heat.
The purpose of this utility model is realized by following technical proposals：
A kind of thermal power plant's tail flue gas afterheat utilizing system coupled based on machine stove depth, is gone out in boiler SCR denitration equipment
The height for being sequentially provided with and being exchanged heat with high-pressure feed water loop in the bypass flue in parallel with air preheater, bypass flue is set after mouthful
Economizer, and the low-pressure coal saver exchanged heat with condensate circuit are pressed, air preheater exports cloth in the flue after converging and set low
Warm economizer and first and second wind system of supply burner hearth primary and secondary air exchange heat.
Alternatively, the high-pressure feed water loop of high-pressure economizer is from steam turbine building feedwater pump discharge water intaking, with high-pressure economizer
Backwater is to 1# height after heat exchange plus exports.
Alternatively, the condensate circuit of low-pressure coal saver is fetched water and mixed at low pressure condensation water system two, with low pressure
Preceding some levels after economizer heat exchange at backwater to water intaking are low plus export.
Alternatively, first and second wind system includes first and second air pipe line and heating agent water lines, and primary air duct connects successively
Primary air fan, First air steam air heater, air preheater and burner hearth are connect, Secondary Air pipeline is sequentially connected overfire air fan, Secondary Air and warmed up
Wind device, air preheater and burner hearth, heating agent water lines circulation connection primary and secondary air steam air heater and low-level (stack-gas) economizer, primary and secondary air
Pipeline and heating agent water lines exchange heat in primary and secondary air steam air heater.
As further selection, it is additionally provided with auxiliary steam heater in heating agent water lines and/or the small machine steam discharge of air-introduced machine is changed
Hot device.In the program, the Btu utilization thinking of air preheater exiting flue gas be by the further waste heat recovery of low-level (stack-gas) economizer,
And be used to the heat of recovery heat first and second cold wind.Because air preheater is bypassed partial fume, to ensure that air is inhaled
Heat is constant, and the loop of heating primary and secondary air need to increase auxiliary steam heater to provide system external heat source.For using air inducing
The power plant that machine vapour drives, the exhaust steam that preferentially can be driven using vapour is as system external heat source, and insufficient section can be supplied by auxiliary steam again.
As another further selection, booster is set in the heating agent water lines of the heating agent water inlet of low-level (stack-gas) economizer, it is low
Recirculation circuit, which is provided with, in the heating agent water lines of the heating agent water out of warm economizer is communicated to booster pump inlet.
As another further selection, heating agent water tank and chemicals dosing plant are additionally provided with low-heat matchmaker's water lines.
As another further selection, low First air steam air heater and its primary air fan, with Secondary Air steam air heater and its secondary
Blower fan is arranged in parallel in heating agent water lines.
The foregoing main scheme of the utility model and its each further selection scheme can form multiple schemes with independent assortment,
The scheme that can be used and be claimed for the utility model；And the utility model, (each non conflicting selection) selection between and
Can also independent assortment between other selections.Those skilled in the art are after the present invention program is understood according to prior art and public affairs
Know that general knowledge can understand there are multiple combinations, be the claimed technical scheme of the utility model, exhaustion is not done herein.
Workflow of the present utility model：
This patent system carries out energy cascade recycling, and realize from row according to thermal power plant's tail flue gas temperature conditions
The low-quality energy of cigarette waste heat to feeding burner hearth hot blast high-quality energy conversion so that truly improve unit effect
Rate.
This patent system sets the bypass flue in parallel with air preheater after Denitration in Boiler equipment (SCR) outlet,
Make to be partly into air preheater from the high-temperature flue gas that SCR is exported, another part enters bypass flue, and bypass flue gas is high
Press the high-pressure feed water in economizer and the condensate in low-pressure coal saver.Air preheater is exported to be arranged in the flue after converging
Cigarette warm water puts down relatively low heat in low-level (stack-gas) economizer, further recovered flue gas, then heats one or two by a Secondary Air steam air heater
Secondary air-cooled wind.
This patent system is divided into 3 loops：Air preheater bypass high-pressure economizer loop；Air preheater bypasses low pressure
Economizer loop；Low-level (stack-gas) economizer joint steam air heater loop.
Air preheater bypasses high-pressure economizer loop from steam turbine building feedwater pump discharge water intaking, delivers to air preheater bypass
The high-pressure economizer of high temperature section, feedwater backwater to the 1# height after being heated adds outlet, return water temperature and 1# height plus exit water temperature base
This is consistent.The heat replacement steam turbine that the loop bypasses high temperature section flue gas using air preheater, which draws gas, heats the heat of feedwater, quilt
The continuation of drawing gas of exclusion is done work, and improves the economy of unit.
Air preheater bypass low-pressure coal saver loop is fetched water at low pressure condensation water system two to be mixed to suitable temperature, so
The low-pressure coal saver that air preheater bypasses low-temperature zone is delivered to afterwards, causes low temperature to prevent low-pressure coal saver tube wall temperature too low
Corrosion.Preceding some levels at coagulation hydroenergy backwater to water intaking after being heated are low plus export (such as 5# is low plus exports), return water temperature
It is basically identical with this grade low plus exit water temperature.The heat that the loop bypasses low-temperature zone flue gas using air preheater substitutes steam turbine and taken out
The heat of vapour heat-setting water, the continuation of drawing gas squeezed is done work, and improves the economy of unit.
Low-level (stack-gas) economizer joint steam air heater loop carries out heat transfer using closed cycle heat medium water.Heat medium water passes through boosting
After pump is heated into low-level (stack-gas) economizer, then deliver to primary and secondary air steam air heater heating primary and secondary air, low-level (stack-gas) economizer outlet heat
The recycled loop backwater of matchmaker's water is to booster pump inlet.Primary and secondary air steam air heater exports wind-warm syndrome, i.e. air preheater import wind
Temperature, need to ensure that air preheater outlet wind-warm syndrome meets the overall heat exchange requirement of boiler air side.Generally, low-level (stack-gas) economizer heat medium water
The heat of recovery is also insufficient for requirement of the steam air heater to air temperature rise, needs auxiliary steam heater further to heat heat medium water
After water temperature, heat medium water delivers to primary and secondary air steam air heater heating cold wind again.The unit of mode is driven using vapour for air-introduced machine, can be filled
Divide and auxiliary steam is substituted by the small machine steam discharge heat exchanger of air-introduced machine using the heat of the small machine steam discharge of air-introduced machine, steamed with reducing auxiliary
The consumption of vapour.The inlet water temperature of low-level (stack-gas) economizer is by regulating measure by the high temperature heat medium water of recirculation circuit backwater and one, two
Secondary wind steam air heater outlet heat medium water backwater is mixed to suitable temperature, causes low temperature to prevent low-level (stack-gas) economizer tube wall temperature too low
Corrosion.On the one hand heating agent water tank can absorb the thermal expansion of water side system, it is ensured that the property safe and reliable to operation of system；On the other hand
System water supplement can be carried out by heating agent water tank, reflection system whether there is leakage situation from side.Chemicals dosing plant is used to adjust
System heat medium water water quality, to prevent closed cycle heat medium water water quality deterioration, influences the heat transfer effect of heat exchanger.
The beneficial effects of the utility model：
1. system can realize that energy cascade is recycled according to boiler tail flue gas waste heat quality conditions.
2. the heat of air preheater bypass flue flue gas carries out heat transfer by high-pressure economizer and low-pressure coal saver, can
To substitute the heat of the high, medium and low cylinder pressure more bleedings of steam turbine, squeeze extracted steam from turbine, more high-quality steams are used to do work
Generate electricity, improve the overall economy quality of power plant.
3. low-level (stack-gas) economizer continues to absorb the waste heat of air preheater exiting flue gas, for heating air inlet preheating
The primary and secondary air of device, realizes that low-quality heat is changed to the energy of high-quality heat, saves power plant's coal consumption.
4. in the prior art, because partial fume walks air preheater bypass flue, to reach suitable hot blast temperature, it is necessary to
Increase air preheater area, and the design of air preheater is limited by space and technique.The system air preheater
Entering air temperature is higher compared to conventional EAT, on the premise of the design of air preheater heat exchange area is not increased, also can
The requirement that boiler furnace burns to hot blast temperature is enough met, while the raising of air preheater entering air temperature can substantially subtract
The low-temperature corrosion of slow air preheater heat exchange element.
5. system configuration chemicals dosing plant and water charging system (heating agent water tank), ensure that system water quality is qualified, it is ensured that system
It is safe and stable, efficiently run.
Brief description of the drawings
Fig. 1 is the device schematic flow sheet of prior art；
Fig. 2 is the device schematic flow sheet of the utility model embodiment；
In figure, 1 is burner hearth, and 2 be air preheater, and 3 be steam turbine, and 4 be high-pressure economizer, and 5 be low-pressure coal saver, and 6 are
Low-level (stack-gas) economizer, 7 be primary air fan, and 8 be overfire air fan, and 9 be First air warm-air drier, and 10 be Secondary Air warm-air drier, and 11 be auxiliary
Steam heater, 12 be the small machine steam discharge heat exchanger of air-introduced machine, and 13 be booster, and 14 be chemicals dosing plant, and 15 be heating agent water tank, and 16 are
Recirculation circuit, 17 be deduster, and 18 be air-introduced machine, and 19 be desulfurizing tower, and 20 be chimney, and 21 add for 1# height, and 22 be that 2# height adds, 23
Add for 3# is high, 24 be feed pump, and 25 be oxygen-eliminating device, and 26 add for 5# is low, and 27, which be that 6# is low, adds, and 28 add for 7# is low, and 29 heat for axle envelope
Device.
Embodiment
The utility model is further described with reference to specific embodiments and the drawings.
With reference to shown in Fig. 1, technical scheme is utilized according to traditional fume afterheat, the tail after the outlet of air preheater 2
The arrangement heating surface of low-level (stack-gas) economizer 6 in portion's flue.Fume side is down to 90 DEG C from 120 DEG C, working medium side from 6,7# it is low Jia 27,28 entrances
Condensing water conduit extracts condensate, and water temperature is mixed to feeding low-level (stack-gas) economizer 6 after 70 DEG C, and 100 DEG C are heated to through low-level (stack-gas) economizer 6
Backwater adds 26 entrance condensing water conduits to 5# is low afterwards.The waste heat that low-level (stack-gas) economizer 6 is recycled substitutes the 6th grade, the 7th grade of steam turbine
Part is drawn gas, and the continuation of drawing gas squeezed is done work in steam turbine to generate electricity, the average coal consumption of power supply reduction about 4g/ (kWh) of power plant.
With reference to shown in Fig. 2, technical scheme is utilized using this patent fume afterheat, after the outlet of boiler SCR denitration equipment
The air preheater bypass flue in parallel of air preheater 2.For air preheater bypass high-pressure economizer 4 loop, fume side from
375 DEG C are down to 230 DEG C, and working medium side takes 185 DEG C of high-pressure feed waters from the outlet of feed pump 24, after being heated to 295 DEG C through high-pressure economizer 4
Outlet that backwater to 1# height Jia 21.For air preheater bypass low-pressure coal saver 5 loop, fume side is down to 120 DEG C from 230 DEG C,
Working medium side extracts 70 DEG C of low pressure condensate waters from condensate system (7# is low Jia 28 before and after), after being heated to 145 DEG C through low-pressure coal saver 5
Backwater to 5# it is low Jia 26 outlet.The heat of air preheater bypass flue gas substitutes steam turbine the 1st, 2,3,5,6,7 grades of parts and drawn gas,
The continuation of drawing gas squeezed is done work in steam turbine to generate electricity.For the joint steam air heater of low-level (stack-gas) economizer 6 loop, the cigarette of low-level (stack-gas) economizer 6
Gas side is down to 90 DEG C from 120 DEG C, and working medium side uses closed cycle heat medium water, and it is heated that 70 DEG C of heat medium waters enter low-level (stack-gas) economizer 6
After deliver to primary and secondary air steam air heater 9,10.Steam air heater outlet wind-warm syndrome maintains 85 DEG C or so, to ensure that air preheater 2 is exported
Hot blast temperature is not affected because setting air preheater bypass flue, and the heat that steam air heater heating cold wind is not enough is by air-introduced machine
Small machine steam discharge heat exchanger 12 or auxiliary steam heater 11 are supplied.The fume afterheat of this patent utilizes technical scheme, boiler efficiency
About 1.5% or so is improved, the average coal consumption of power supply of power plant reduces about 5~7g/ (kWh), and economy Dominant Facies are than traditional cigarette
Gas UTILIZATION OF VESIDUAL HEAT IN scheme is more obvious.If unit puts into operation by annual utilization hours 7200h, average load rate 75% marks coal price lattice
By 580 yuan/ton, then the annual direct economic benefit of single unit (does not consider that air preheater low temperature is rotten for more than 12,700,000 yuan
Erosion slows down, dust collection efficiency is improved, air-introduced machine power consumption is reduced and the economic benefit of desulfurization water consume reduction).
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
Any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (8)
1. a kind of thermal power plant's tail flue gas afterheat utilizing system coupled based on machine stove depth, it is characterised in that：It is de- in boiler SCR
Set in the bypass flue in parallel with air preheater, bypass flue and be sequentially provided with and high-pressure feed water loop after the outlet of nitre equipment
The high-pressure economizer of heat exchange, and the low-pressure coal saver exchanged heat with condensate circuit, air preheater export the flue after converging
Interior arrangement low-level (stack-gas) economizer and first and second wind system of supply burner hearth primary and secondary air exchange heat.
2. the thermal power plant's tail flue gas afterheat utilizing system as claimed in claim 1 coupled based on machine stove depth, its feature is existed
In：The high-pressure feed water loop of high-pressure economizer is from steam turbine building feedwater pump discharge water intaking, with backwater after high-pressure economizer heat exchange to 1#
Height plus outlet.
3. the thermal power plant's tail flue gas afterheat utilizing system as claimed in claim 1 coupled based on machine stove depth, its feature is existed
In：The condensate circuit of low-pressure coal saver is fetched water and mixed at low pressure condensation water system two, with being returned after low-pressure coal saver heat exchange
Preceding some levels at water to water intaking are low plus export.
4. the thermal power plant's tail flue gas afterheat utilizing system as claimed in claim 1 coupled based on machine stove depth, its feature is existed
In：First and second wind system includes first and second air pipe line and heating agent water lines, and primary air duct is sequentially connected primary air fan, once
Wind steam air heater, air preheater and burner hearth, Secondary Air pipeline are sequentially connected overfire air fan, Secondary Air steam air heater, air preheater
And burner hearth, heating agent water lines circulation connection primary and secondary air steam air heater and low-level (stack-gas) economizer, first and second air pipe line and heating agent water pipe
Road exchanges heat in primary and secondary air steam air heater.
5. the thermal power plant's tail flue gas afterheat utilizing system as claimed in claim 4 coupled based on machine stove depth, its feature is existed
In：Auxiliary steam heater and/or the small machine steam discharge heat exchanger of air-introduced machine are additionally provided with heating agent water lines.
6. the thermal power plant's tail flue gas afterheat utilizing system as claimed in claim 4 coupled based on machine stove depth, its feature is existed
In：Booster, the heat of the heating agent water out of low-level (stack-gas) economizer are set in the heating agent water lines of the heating agent water inlet of low-level (stack-gas) economizer
Recirculation circuit, which is provided with, in matchmaker's water lines is communicated to booster pump inlet.
7. the thermal power plant's tail flue gas afterheat utilizing system as claimed in claim 4 coupled based on machine stove depth, its feature is existed
In：Heating agent water tank and chemicals dosing plant are additionally provided with heating agent water lines.
8. the thermal power plant's tail flue gas afterheat utilizing system as claimed in claim 4 coupled based on machine stove depth, its feature is existed
In：First air steam air heater and its primary air fan, are arranged in parallel with Secondary Air steam air heater and its overfire air fan in heating agent water lines.
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| CN201621385154.8U CN206320726U (en) | 2016-12-16 | 2016-12-16 | A kind of thermal power plant's tail flue gas afterheat utilizing system coupled based on machine stove depth |
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| CN201621385154.8U CN206320726U (en) | 2016-12-16 | 2016-12-16 | A kind of thermal power plant's tail flue gas afterheat utilizing system coupled based on machine stove depth |
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| CN111678116A (en) * | 2020-05-25 | 2020-09-18 | 大唐东北电力试验研究院有限公司 | Gradient utilization method for flue gas of 1000MW double reheating power plant |
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