CN106766966B - A kind of heater for rolling steel waste heat recycling system - Google Patents
A kind of heater for rolling steel waste heat recycling system Download PDFInfo
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- CN106766966B CN106766966B CN201710068840.5A CN201710068840A CN106766966B CN 106766966 B CN106766966 B CN 106766966B CN 201710068840 A CN201710068840 A CN 201710068840A CN 106766966 B CN106766966 B CN 106766966B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
- F22B1/1892—Systems therefor not provided for in F22B1/1807 - F22B1/1861
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- 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
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
-
- 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
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
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- General Engineering & Computer Science (AREA)
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
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Abstract
The invention discloses a kind of heater for rolling steel waste heat recycling systems, including heating-furnace bottom water beam apparatus for vapour-cooling, furnace outlet flue, flue gas waste heat recovery flue, the stagewise air-gas preheating device including at least one level air preheater and/or at least one level arrangement for gas preheating is provided in furnace outlet flue, for carrying out progressive solution to cold air and/or cooled coal gas, in furnace outlet flue, a branch is drawn after wherein level-one preheating device to be connected with the flue gas waste heat recovery flue, boiler circuit and heat-exchange system are designed according to flue gas grade height, the high-temperature flue gas of furnace outlet is exchanged heat using high pressure boiler circuit, heating-furnace bottom water beam apparatus for vapour-cooling presses boiler circuit to exchange heat in using, low-temperature flue gas in waste heat reclaiming flue using low pressure vapor system into Row heat exchange, and done work using steam drive steam turbine.
Description
Technical field
The present invention relates to the field of energy-saving technology of steel industry, specifically, being related to a kind of heater for rolling steel waste heat recycling
Utilize system.
Background technique
In each smelting procedure of iron and steel enterprise, steel rolling process is a very important link in Steel Production Flow Chart, is rolled
The energy consumption level of steel process has very important influence for steel and iron industry ton steel comprehensive energy consumption.
Heater for rolling steel is to reheat bloom or continuous casting billet, the equipment to meet rolling required temperature.Heating furnace
Be in steel rolling process it is maximum with can equipment, therefore energy conservation of the energy conservation for steel rolling process or even entire steel mill of heater for rolling steel
Consumption reduction work all has important impetus.Instantly steel industry is in opposite trough period, and many steel mills are all in full benefit
The even state of loss of capital.In this case, each to smelt the UTILIZATION OF VESIDUAL HEAT IN of main equipment such as heater for rolling steel, energy conservation in sub- process
Synergy has caused the attention of each steel mill.
Currently, the furnace equipment of heater for rolling steel and the technology of heater control system etc. all compare into
Ripe, for heater for rolling steel, energy-efficient Main way should be in heating furnace auxiliary system flue gas heat Optimum utilization, waste heat
Recycling etc. is tapped the potential energy.For recuperative heater, at present the final exhaust gas temperature of heating furnace can be reduced to 150 DEG C with
Under, but for normal reheating furnace, in particular by the heating furnace of air and gas double pre-heating technology, most of exhaust gas temperatures are
300 DEG C or so, flue gas heat recovery rate is relatively low, causes the fume afterheat wasting of resources, but it discharges flue-gas temperature again not
Be it is very high, belong to cryogenic waste heat resource, flue gas grade is slightly lower.For this purpose, the present invention is quasi- to construct a kind of heater for rolling steel waste heat recycling
Using system, air, gas preheating system and vapor-recovery system are considered as a whole, to the fume afterheat resource of heater for rolling steel
Utilization is optimized, guaranteeing air and improve fume afterheat grade and residual neat recovering system in the case where gas preheating effect
Reasonability can necessarily harvest considerable economic well-being of workers and staff, have important practical value.
Summary of the invention
The present invention provides a kind of heater for rolling steel waste heat recycling systems, by air preheating system and Steam Recovery system
System is considered as a whole, optimizes utilization to the fume afterheat resource of heater for rolling steel, is guaranteeing air and gas preheating effect
In the case of improve fume afterheat grade and residual neat recovering system reasonability.
According to an aspect of the invention, there is provided a kind of heater for rolling steel waste heat recycling system, including heating furnace
Furnace bottom water beam apparatus for vapour-cooling, furnace outlet flue, flue gas waste heat recovery flue, are provided in furnace outlet flue point
Grade formula air-gas preheating device, the stagewise air-gas preheating device include at least one level air preheater and/
Or at least one level arrangement for gas preheating, for carrying out progressive solution to cold air and/or cooled coal gas, by cold air and/or cold coal
Gas is sent into heating furnace burner after being heated to set temperature, is additionally provided with a branch and the flue gas in the furnace outlet flue
Waste heat reclaiming flue is connected, and the branch is according to flue-gas temperature design value from a certain in stagewise air-gas preheating device
It is drawn after grade preheating device, is sequentially disposed with high-pressure superheater along flue gas flow direction in flue gas waste heat recovery flue, high pressure is steamed
Hair device, middle pressure superheater, high-pressure economizer, middle pressure economizer, low pressure evaporator, low-pressure coal saver, flue gas waste heat recovery flue,
Heating-furnace bottom water beam apparatus for vapour-cooling combination low pressure drum-oxygen-eliminating device, middle pressure drum and high pressure drum is respectively formed low pressure
Boiler circuit, middle pressure boiler circuit, high pressure boiler circuit generate the acting of steam drive steam turbine, wherein high according to flue gas grade
It is low to carry out heat exchange design, the high-temperature flue gas of furnace outlet is exchanged heat using high pressure boiler circuit, heating-furnace bottom water beam
Apparatus for vapour-cooling presses boiler circuit to exchange heat in using, and the low-temperature flue gas in waste heat reclaiming flue uses low pressure vapor system
It exchanges heat.
Preferably, low pressure drum-oxygen-eliminating device is steamed by the low pressure in the first down-comer and the flue gas waste heat recovery flue
The water inlet connection of device is sent out, and the venthole of low pressure evaporator passes through the upper of the first tedge and the low pressure drum-oxygen-eliminating device
The connection of riser mouth forms a natural convection loop, also, low pressure drum-oxygen-eliminating device passes through the first outlet pipe and middle pressure
The water inlet of feed pump is connected to, and the water outlet of middle pressure feed pump is connected to the water inlet of middle pressure economizer, and middle pressure economizer goes out
The mouth of a river is connected to by pipeline with the water inlet of middle pressure drum；Medium pressure drum by the second down-comer and Medium pressure cycle pump into
Mouth of a river connection, the water outlet of medium pressure circulating pump are connected to the water inlet of the furnace bottom water beam apparatus for vapour-cooling, the furnace
The venthole of bottom water beam apparatus for vapour-cooling is connected to by the second tedge with the rising nozzle of medium pressure drum, forms one
Forced circulation circuit, also, low pressure drum-oxygen-eliminating device is connected to by the second outlet pipe with the water inlet of high pressure water pump, and it is described
The water outlet of high pressure water pump is connected to the water inlet of high-pressure economizer, and the water outlet of high-pressure economizer passes through pipeline and pressure cooker
The water inlet connection of cylinder, high pressure drum are connected to by third down-comer with the water inlet of the high pressure evaporator, high pressure evaporator
Venthole be connected to the rising nozzle of the high pressure drum by third tedge, form a natural convection loop, it is described
The venthole of high pressure drum is connected to the air intake of high-pressure superheater, the main steam of the venthole of high-pressure superheater and steam turbine into
Mouth connection, and the venthole of middle pressure drum is connected to the air intake of middle pressure superheater, the venthole and steam turbine of middle pressure superheater
Filling inlet communication, increase the power output of steam turbine.
Preferably, the steam drain of steam turbine and condenser, condensate pump, low-pressure coal saver and low pressure drum-oxygen-eliminating device
Water inlet be sequentially communicated along carbonated drink process.
Preferably, preposition devaporizer, the preposition devaporizer position are additionally provided in furnace outlet flue
In the fume side upstream of the stagewise air-gas preheating device, high pressure drum passes through the 4th down-comer and high-pressure circulation pump
Water inlet connection, the water outlet of high-pressure circulation pump is connected to the water inlet of preposition devaporizer, preposition devaporizer
Venthole is connected to by the 4th tedge with the rising nozzle of high pressure drum.
Preferably, high-pressure superheater, high pressure evaporator, middle pressure superheater, high-pressure economizer, middle pressure economizer, low pressure are steamed
Hair device, low-pressure coal saver all use counter-flow arrangement.
Preferably, the flue gas waste heat recovery flue is the flue or integrated waste heat boiler of built-in heat-transfer surface.
Preferably, the venthole of medium pressure drum is heated by the auxiliary of pipeline and the low pressure drum-oxygen-eliminating device and is steamed
Vapor inlet is connected.
Preferably, the preposition devaporizer uses down current arrangement.
Preferably, the low pressure drum-oxygen-eliminating device is the combination of low pressure drum and oxygen-eliminating device, and oxygen-eliminating device is installed on low pressure cooker
Cylinder top, low pressure drum double as deoxygenation water tank.
Detailed description of the invention
By the way that embodiment is described in conjunction with following accompanying drawings, features described above of the invention and technological merit will become
More understands and be readily appreciated that.
Fig. 1 be indicate the present embodiments relate to heater for rolling steel waste heat recycling system process flow chart.
Including heater for rolling steel 1, furnace bottom water beam apparatus for vapour-cooling 2, furnace outlet flue 3, flue gas waste heat recovery cigarette
High-pressure superheater 401, high pressure evaporator 402, middle pressure superheater 403, high-pressure economizer 404, middle pressure economizer are set in road 4(
405, low pressure evaporator 406, low-pressure coal saver 407), low pressure drum-oxygen-eliminating device 5, middle pressure feed pump 6, middle pressure drum 7, middle pressure
Circulating pump 8, high pressure water pump 9, high pressure drum 10, high-pressure circulation pump 11, steam turbine 12, condenser 13, condensate pump 14, first
Down-comer 51, the first tedge 52, the first outlet pipe 53, the second outlet pipe 54, pipeline 71, the decline of the second tedge 72, second
Pipe 73, pipeline 101, third down-comer 102, third tedge 103, the 4th tedge 104, the 4th down-comer 105.
Specific embodiment
The embodiment of heater for rolling steel waste heat recycling system of the present invention described below with reference to the accompanying drawings.This
The those of ordinary skill in field will recognize, without departing from the spirit and scope of the present invention, can with it is various not
Same mode or combinations thereof is modified described embodiment.Therefore, attached drawing and description are regarded as illustrative in nature, and
It is not intended to limitation scope of protection of the claims.In addition, in the present specification, attached drawing is drawn not in scale, and identical
Appended drawing reference indicates identical part.It should be noted that high pressure of the present invention, middle pressure, low pressure are to distinguish carbonated drink system
The pressure rating of system and carry out differentiation name (such as: high steam, middle pressure steam, low-pressure steam pressure separately design for
3.83MPa, 1.6MPa, 0.5MPa), not absolute high pressure (such as 9.81MPa), absolutely middle pressure (such as 4.9MPa), absolute low pressure are (such as
0.8MPa).Arrow direction flowing of the carbonated drink flowing along attached drawing in respective line is described below.
The present invention is to provide for a kind of heater for rolling steel waste heat recycling system, which includes heater for rolling steel 1, furnace
Bottom water beam apparatus for vapour-cooling 2, furnace outlet flue 3, flue gas waste heat recovery flue 4, low pressure drum-oxygen-eliminating device 5, middle pressure pot
Cylinder 7, high pressure drum 10, steam turbine 12.Wherein, the furnace bottom water beam apparatus for vapour-cooling 2 is arranged in the heater for rolling steel 1
In, it is used for cooling furnace bottom water beam, to generate steam water interface.Flue gas waste heat recovery flue can be traditional flue and in cigarette
Heat-transfer surface is set in road, is also possible to integrated waste heat boiler.Heating furnace furnace outlet flue gas then along figure arrow A direction into
Enter furnace outlet flue.
Stagewise air-gas preheater is arranged in furnace outlet flue according to flue-gas temperature height, uses high energy
The air of grade and the flue gas of high level exchange heat, and the air of low-lying level and the flue gas of low-lying level exchange heat.The stagewise
Air-gas preheating device includes at least one level air preheater and/or at least one level arrangement for gas preheating, for cold sky
Gas and/or cooled coal gas carry out progressive solution, and cold air and/or cooled coal gas are heated to be sent again after set temperature to heating furnace and burnt
Mouth.
Stagewise air-gas preheating device is described in detail below with reference to Fig. 1.The first order air preheater 302,
Level-one gas preheater 303, second level air preheater 304, second level gas preheater 305 are sequentially arranged along flue gas flow direction.
External cold air is successively sent after first order air preheater, second level air preheat heating to heating furnace burner, similarly,
External cooled coal gas is successively sent to heating furnace burner (in figure not after first order gas preheater, the heating of second level gas preheating
Air, coal gas inlet and outlet are shown).The above is only illustrating by taking two-stage air-gas preheating device as an example, the stagewise air-coal
Gas preheating device is not limited to two-stage, can be more than two-stage, can also be less than two-stage.Air preheater can also be separately provided
Or setting gas preheater.Under the fume side of the wherein level-one preheating device in the stagewise air-gas preheating device
Trip, the furnace outlet flue are equipped with a branch and are connected with the flue gas waste heat recovery flue, the position of the branch according to
Flue-gas temperature design value is arranged in after the wherein level-one preheating device in stagewise air-gas preheating device.
Be provided in the flue gas waste heat recovery flue high-pressure superheater of counter-flow arrangement, high pressure evaporator, in press through
Hot device, high-pressure economizer, middle pressure economizer, low pressure evaporator, low-pressure coal saver.
The present embodiment carries out grading design according to flue gas grade height, and the high-temperature flue gas of furnace outlet is used high pressure vapour
Water system exchanges heat, and pressure boiler circuit exchanges heat in the use of heating-furnace bottom water beam apparatus for vapour-cooling, and waste heat recycles cigarette
Low-temperature flue gas in road is exchanged heat using low pressure vapor system.Also, the heating-furnace by safe operation as First Essential
Bottom water beam apparatus for vapour-cooling and preposition devaporizer in excessive temperature area are designed to forced circulation mode, and high pressure is steamed
Hair system and low pressure deoxygenation vapo(u)rization system are arranged to natural circulation mode, and each process pipeline process is described in detail below with reference to Fig. 1.
Low pressure drum-the oxygen-eliminating device 5 is the combination of low pressure drum and oxygen-eliminating device, and oxygen-eliminating device is installed on the top of low pressure drum, low pressure
Drum doubles as deoxygenation water tank.Low pressure drum-oxygen-eliminating device 5 passes through in the first down-comer 51 and the flue gas waste heat recovery flue 4
The water inlet of low pressure evaporator 406 is connected to, and the venthole of low pressure evaporator 406 passes through the first tedge 52 and the low pressure cooker
The rising nozzle of cylinder-oxygen-eliminating device is connected to, and forms a natural convection loop.Low pressure drum-the oxygen-eliminating device 5 passes through the first water outlet
Pipe 53 is connected to the water inlet of middle pressure feed pump 6, and the water outlet of middle pressure feed pump is connected to the water inlet of middle pressure economizer 405,
Middle pressure economizer is supplied water by pipeline 71 to middle pressure drum 7.Medium pressure drum 7 is pumped by the second down-comer 73 with Medium pressure cycle
8 water inlet connection, the water outlet of medium pressure circulating pump are connected to the water inlet of the furnace bottom water beam apparatus for vapour-cooling 2,
The venthole of the furnace bottom water beam apparatus for vapour-cooling is connected to by the second tedge 72 with the rising nozzle of the high pressure drum,
Form a forced circulation circuit.Low pressure drum-oxygen-eliminating device 5 is connected by the water inlet of the second outlet pipe 54 and high pressure water pump 9
Logical, the water outlet of the high pressure water pump is connected to the water inlet of high-pressure economizer 404, high-pressure economizer pass through pipeline 101 to
High pressure drum 10 supplies water.High pressure drum is connected to by third down-comer 102 with the water inlet of the high pressure evaporator 402, high pressure
The venthole of evaporator 402 is connected to by third tedge 103 with the rising nozzle of the high pressure drum, is formed one and is followed naturally
The venthole of loop back path, the high pressure drum is connected to the air intake of high-pressure superheater 401, the venthole and vapour of high-pressure superheater
The main steam inlet communication of turbine, and the venthole of middle pressure drum is connected to the air intake of middle pressure superheater 403, middle pressure superheater
Venthole and steam turbine filling inlet communication, increase the power output of steam turbine.The steam turbine can be used for driven generator hair
Electricity, it can also be used to other rotating machineries (such as blower or water pump) be driven to do work.
In addition, the outlet vapor pipeline of medium pressure drum separates a branch, it is auxiliary with the low pressure drum-oxygen-eliminating device
Heating steam inlet connection is helped, and is additionally provided with reducer unit on the branch road.
In addition, being additionally provided with preposition devaporizer 301 in the exhaust pass of heater for rolling steel, the preposition evaporation is cold
But the fume side upstream of the stagewise air-gas preheating device can be arranged in device by the way of down current arrangement.High pressure
Drum is connected to by the 4th down-comer 105 with the water inlet of high-pressure circulation pump 11, the water outlet of high-pressure circulation pump and preposition evaporation
The water inlet of cooler is connected to, the tedge that the venthole of preposition devaporizer passes through the 4th tedge 104 and high pressure drum
Mouth connection.
In addition, the steam drain of steam turbine 12 and the condenser 13, the condensate pump 14, low-pressure coal saver and low pressure
Drum-oxygen-eliminating device water inlet is sequentially connected to along carbonated drink process, and condenser is provided with water supplement port, to supplement residual neat recovering system
The carbonated drink lost.The condensed water that low-pressure coal saver can carry out steam turbine preheats, and not only further absorbs more than flue gas
Heat improves the heat-economy of residual neat recovering system, but also can be lowered into the flue-gas temperature of downstream dust removal installation, is conducive to remove
The safe operation of dirt facility.
In conclusion heater for rolling steel waste heat recycling system of the invention has the advantages that
(1) present invention integrates heater for rolling steel residual heat resources, by air-gas pre-heating system, heater for rolling steel
Furnace bottom water beam evaporated cooling system, heater for rolling steel tail flue gas residual neat recovering system are considered as a whole, unified to be laid out, full
The grade of waste heat recovered flue gas is improved on the basis of sufficient heating furnace combustion needs in favor of the effective use of fume afterheat, and
The smoke heat energy of heating furnace has farthest been recycled by system optimization layout.
(2) present invention carries out rational deployment according to the grade of smoke heat energy, and boiler circuit is designed to by boiler circuit aspect
Three pressure systems carry out grading design according to flue gas grade height, the high-temperature flue gas of furnace outlet are used high pressure boiler circuit
It exchanges heat, pressure boiler circuit exchanges heat in the use of heating-furnace bottom water beam apparatus for vapour-cooling, in waste heat reclaiming flue
Low-temperature flue gas is exchanged heat using low pressure vapor system；Air preheating system and gas preheating system are designed to progressive solution mould
Formula is exchanged heat with the flue gas of the air of high level and high level, and the air of low-lying level and the flue gas of low-lying level exchange heat, with
Regular air preheating mode is greatly reduced compared to system heat exchange damage.The present invention is not only by being greatly reduced heater for rolling steel smoke evacuation
Temperature so from " amount " recycle heater for rolling steel fume afterheat, and according to energy grade height design heat-exchange system in turn from
Heater for rolling steel fume afterheat is recycled in " matter ", realizes energy step Optimum utilization；In addition, present invention the whole series UTILIZATION OF VESIDUAL HEAT IN system
Connection relationship between the design of system and each equipment, the safety for being integrated system and the optimization after heat-economy
Layout.
(3) present invention is in the optimization design for carrying out heater for rolling steel furnace bottom water beam evaporated cooling system and residual neat recovering system
When, in conjunction with the reapective features of heating-furnace bottom water beam Vaporizing cooling, preposition devaporizer and waste heat reclaiming flue heating surface,
Steam-water circulation system is designed to the compound recycle mode of naturally partial order forced circulation, will be safely operated as First Essential
Heating-furnace bottom water beam apparatus for vapour-cooling and preposition devaporizer in excessive temperature area are designed to forced circulation mode,
High-pressure evaporation system and low pressure deoxygenation vapo(u)rization system are arranged to natural circulation mode, a whole set of boiler circuit is guaranteeing system safety
The energy-saving run of system has been taken into account under the conditions of reliable again.
(4) the preposition devaporizer of level-one is first arranged in the present invention before flue gas waste heat recovery flue, heating furnace can be gone out
The temperature of mouth high-temperature flue gas (some furnace outlet smoke temperatures are up to 1000 DEG C or so) reduces, and then protects each in the flue of downstream
The safety of grade heating surface；And fecund has gone out a certain amount of steam compared with routine is by way of mixing cold wind and reducing smoke temperature, has
There is better economic well-being of workers and staff.
The above description is only a preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of heater for rolling steel waste heat recycling system, including heating-furnace bottom water beam apparatus for vapour-cooling (2), heating furnace
Exhaust pass (3), flue gas waste heat recovery flue (4), which is characterized in that
Stagewise air-gas preheating device, the stagewise air-gas preheating device are provided in furnace outlet flue
Including secondary air preheating device and/or second level arrangement for gas preheating, add for carrying out classification to cold air and/or cooled coal gas
Heat is sent into heating furnace burner after cold air and/or cooled coal gas are heated to set temperature,
Have in the furnace outlet flue preposition devaporizer (301), the preposition devaporizer is located at the classification
The fume side upstream of formula air-gas preheating device, high pressure drum pass through the 4th down-comer (105) and high-pressure circulation pump (11)
Water inlet connection, the water outlet of high-pressure circulation pump are connected to the water inlet of preposition devaporizer, and preposition devaporizer goes out
Steam ports is connected to by the 4th tedge (104) with the rising nozzle of high pressure drum, is additionally provided with one in the furnace outlet flue
Branch is connected with the flue gas waste heat recovery flue, and the branch is from the first order in stagewise air-gas preheating device
It is drawn between preheating device and second level preheating device,
High-pressure superheater (401), high pressure evaporator are sequentially disposed with along flue gas flow direction in flue gas waste heat recovery flue (4)
(402), middle pressure superheater (403), high-pressure economizer (404), middle pressure economizer (405), low pressure evaporator (406), low pressure save
Coal device (407),
Flue gas waste heat recovery flue (4), heating-furnace bottom water beam apparatus for vapour-cooling (2) combine low pressure drum-oxygen-eliminating device (5),
Middle pressure drum (7) and high pressure drum (10) are respectively formed low pressure vapor system, middle pressure boiler circuit, high pressure boiler circuit, generate
Steam drive steam turbine (12) acting, wherein
Heat exchange design is carried out according to flue gas grade height, the high-temperature flue gas of furnace outlet is changed using high pressure boiler circuit
Heat, heating-furnace bottom water beam apparatus for vapour-cooling use in pressure boiler circuit exchange heat, the low temperature cigarette in waste heat reclaiming flue
Gas is exchanged heat using low pressure vapor system.
2. heater for rolling steel waste heat recycling system according to claim 1, which is characterized in that low pressure drum-deoxygenation
Device (5) is connected by the water inlet of the low pressure evaporator (406) in the first down-comer (51) and the flue gas waste heat recovery flue (4)
It is logical, and the venthole of low pressure evaporator (406) passes through the rising nozzle of the first tedge (52) and the low pressure drum-oxygen-eliminating device
Connection, forms a natural convection loop, also,
The low pressure drum-oxygen-eliminating device (5) is connected to by the first outlet pipe (53) with the water inlet of middle pressure feed pump (6), middle pressure
The water outlet of feed pump be connected to the water inlet of middle pressure economizer (405), the water outlet of middle pressure economizer by pipeline (71) and
The water inlet connection of middle pressure drum (7)；
Medium pressure drum (7) is connected to by the second down-comer (73) with the water inlet of Medium pressure cycle pump (8), medium pressure circulation
The water outlet of pump is connected to the water inlet of the furnace bottom water beam apparatus for vapour-cooling (2), the furnace bottom water beam apparatus for vapour-cooling
Venthole be connected to the rising nozzle of medium pressure drum by the second tedge (72), form a forced circulation circuit,
Also,
Low pressure drum-oxygen-eliminating device (5) is connected to by the second outlet pipe (54) with the water inlet of high pressure water pump (9), the high pressure
The water outlet of feed pump is connected to the water inlet of high-pressure economizer, and the water outlet of high-pressure economizer passes through pipeline (101) and high pressure
The water inlet of drum (10) is connected to,
High pressure drum is connected to by third down-comer (102) with the water inlet of the high pressure evaporator (402), high pressure evaporator
(402) venthole is connected to by third tedge (103) with the rising nozzle of the high pressure drum, and a Natural Circulation is formed
Circuit,
The venthole of the high pressure drum (10) is connected to the air intake of high-pressure superheater (401), the venthole of high-pressure superheater
With the main steam inlet communication of steam turbine, and
The venthole of middle pressure drum is connected to the air intake of middle pressure superheater (403), the venthole and steam turbine of middle pressure superheater
Filling inlet communication, increase the power output of steam turbine.
3. heater for rolling steel waste heat recycling system according to claim 2, which is characterized in that the row of steam turbine (12)
Steam ports and condenser (13), condensate pump (14), low-pressure coal saver and low pressure drum-oxygen-eliminating device (5) water inlet are along carbonated drink
Process is sequentially communicated.
4. heater for rolling steel waste heat recycling system according to claim 1, which is characterized in that
High-pressure superheater, high pressure evaporator, middle pressure superheater, high-pressure economizer, middle pressure economizer, low pressure evaporator, low pressure save
Coal device all uses counter-flow arrangement.
5. heater for rolling steel waste heat recycling system according to claim 1, which is characterized in that the fume afterheat returns
Receive the flue or integrated waste heat boiler that flue is built-in heat-transfer surface.
6. heater for rolling steel waste heat recycling system according to claim 1, which is characterized in that medium pressure drum
Venthole heats steam inlet with the auxiliary of the low pressure drum-oxygen-eliminating device by pipeline and is connected.
7. heater for rolling steel waste heat recycling system according to claim 1, which is characterized in that the preposition evaporation is cold
But device uses down current arrangement.
8. heater for rolling steel waste heat recycling system according to claim 1, which is characterized in that the low pressure drum-
Oxygen-eliminating device is the combination of low pressure drum and oxygen-eliminating device, and oxygen-eliminating device is installed on above low pressure drum, and low pressure drum doubles as deoxygenation water tank.
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| CN106766966B true CN106766966B (en) | 2019-09-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109098797B (en) * | 2017-06-21 | 2023-10-20 | 华北理工大学 | Coal-fired gas power generation system |
| CN107940439A (en) * | 2017-10-25 | 2018-04-20 | 河南中烟工业有限责任公司 | A kind of boiler smoke heat energy recycling system |
| CN107631640A (en) * | 2017-11-02 | 2018-01-26 | 中冶赛迪工程技术股份有限公司 | A kind of electric furnace residual neat recovering system and method |
| CN108855941A (en) * | 2018-07-26 | 2018-11-23 | 郑州沃特节能科技股份有限公司 | A kind of steel slag micro mist using steel plant's waste heat flue gas selects powder system |
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