CN103353121B - A kind of Blast Furnace Gas-fired Boiler fume afterheat advanced recycling system - Google Patents

A kind of Blast Furnace Gas-fired Boiler fume afterheat advanced recycling system Download PDF

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CN103353121B
CN103353121B CN201310313493.XA CN201310313493A CN103353121B CN 103353121 B CN103353121 B CN 103353121B CN 201310313493 A CN201310313493 A CN 201310313493A CN 103353121 B CN103353121 B CN 103353121B
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gas
preheater
temperature
air
coal
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CN103353121A (en
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叶亚兰
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Nanjing Kaiyun Shipping Co., Ltd.
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Jiangsu Maritime Institute
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Abstract

The present invention relates to a kind of Blast Furnace Gas-fired Boiler fume afterheat advanced recycling system.Described system, including regular air preheater, conventional gas preheater, low-pressure coal saver, also includes forward type low-temperature air preheater and forward type low temperature coal gas preheater;Regular air preheater, conventional gas preheater and low-pressure coal saver sequentially connect in fume side, and the smoke outlet of low-pressure coal saver divides two-way to be connected with the gas approach end of forward type low-temperature air preheater and the gas approach end of forward type low temperature coal gas preheater respectively;The air intlet end of regular air preheater is connected with the air outlet slit end of forward type low-temperature air preheater;The conventional gas inlet end of gas preheater is connected with the gas exit end of forward type low temperature coal gas preheater.Flue gas, at first heat-setting water, increases unit generation amount, then to air and gas preheating, it is achieved air and the progressive solution of coal gas, reduce the heat transfer temperature difference of heat exchanger, reduce heat exchange and damage, degree of depth Mist heat recovering.

Description

A kind of Blast Furnace Gas-fired Boiler fume afterheat advanced recycling system
Technical field
The present invention relates to boiler afterheat and utilize field, particularly relate to a kind of Blast Furnace Gas-fired Boiler fume afterheat degree of depth and return Receipts utilize system.
Background technology
Iron and steel enterprise creates substantial amounts of by-product gas in smelting process, in various by-product gas, and blast furnace gas heat It is worth minimum, but yield is maximum.Under Iron and Steel Enterprises in China state of the art, remove the iron and steel work such as blast funnace hot blast stove, heating furnace The autophage of skill, blast furnace gas still has a large amount of residue.The conventional way of steel plant is residual gas to be diffused sky, not only wave Take the energy of preciousness, and environment also can have been caused pollution greatly by the gases such as CO contained in blast furnace gas.In recent years, with Being showing improvement or progress day by day and promoting of Blast Furnace Gas-fired Boiler generation technology, Blast Furnace Gas-fired Boiler generating set is in iron and steel enterprise Being widely applied, each steel plant build gas power station in succession, are the most not only effectively utilized blast furnace gas resource, Er Qiemei Gas boiler also stabilizes the fluctuation of plant area's gaspipe network as interruptible customer.
At present, the blast furnace gas boiler that nationwide is big and small, exhaust gas temperature meansigma methods at about 160 DEG C, part Exhaust gas temperature is even as high as 200 DEG C, and the flue gas of such high temperature is directly discharged into air, and the most of waste heat in flue gas does not obtain To recycling, cause the significant wastage of the energy.And on the other hand, the sulfur content of blast furnace gas is the lowest, almost can ignore Disregarding, therefore the boiler of fully burning blast-furnace gas is substantially absent from the problem of cold end corrosion, and this allows for the exhaust gas temperature of boiler Also has the biggest decline space.As can be seen here, blast furnace gas boiler smoke evacuation is the residual heat resources having a high potential, if can be to it Carry out Appropriate application, good economic benefit can be gathered in the crops.
In the last few years, under country vigorously advocates the overall situation of " energy-saving and emission-reduction " policy, more domestic steel plant start to amass Pole attempts reclaiming the fume afterheat of gas boiler, and the most commonly used method is to use fume afterheat to preheat into stove Cooled coal gas, as it is shown in figure 1, install gas preheater 3 in the exhaust pass of air preheater 2, boiler smoke is through gas preheating After device 3 absorbing and cooling temperature, it is evacuated to chimney 5 by air-introduced machine 4, finally enters air.On the one hand the program reduces boiler exhaust gas temperature Degree, reduces heat loss due to exhaust gas, thus improves boiler thermal output;On the other hand, improve as-fired coal temperature, improve low Catching fire and combustion position of calorific value blast furnace gas, can not only improve coal gas after-flame degree, reduces loss of the inadequacy burning for chemistry mechanics reason, And then raising boiler thermal output, and advantageously account for Blast Furnace Gas-fired Boiler and catch fire that difficulty, fire box temperature be low, combustion instability Etc. problem.
But, use this recovery scheme to exist following not enough:
1) although boiler tail flue gas waste heat can obtain a certain amount of recycling, but the flue-gas temperature of exhanst gas outlet is still So reach 130 DEG C~150 DEG C, there is also the biggest reduction space;
2) at the cold end of air preheater, air temperature is ambient temperature (not considering the temperature rise that pressure fan is brought), logical Be often about 25 DEG C even lower, and flue gas is usually about 180 DEG C the highest, and the two temperature difference is up to more than 150 DEG C, by base In the second law of thermodynamicsAnalysis theories understands, in heat transfer process, due to not isothermal heat transfer and friction loss etc. The existence of irreversible process, heat also exists bigger heat exchange when high temp objects is transmitted to cryogenic object(available energy) damages, and Heat transfer temperature difference is the biggest, heat exchangeDamaging the biggest, therefore the biggest between flue gas and air heat transfer temperature difference will cause air preheat Device heat exchangeLoss is relatively big, cause flue gas can with can utilization the most abundant;
3) in like manner, at the cold end of gas preheater, cooled coal gas temperature is relatively low, usually about 35 DEG C even lower, and cigarette Gas is usually about 140 DEG C the highest, and the two temperature difference is up to more than 100 DEG C, and the biggest heat transfer temperature difference will cause coal gas Preheater heat exchangeLoss is relatively big, cause flue gas can with can utilization the most abundant.
Summary of the invention
Technical problem the most to be solved
The degree of depth recycles blast furnace gas boiler fume afterheat, reduces exhaust gas temperature further, and by the step of energy Utilize and reduce the heat exchanger heat transfer temperature difference, reduce heat exchangeDamage, improve the effective rate of utilization of gas energy.
2. technical scheme is
In prior art, although boiler tail flue gas waste heat can obtain a certain amount of recycling, but exhanst gas outlet Flue-gas temperature still reaches 130 DEG C~150 DEG C, there is also the biggest reduction space.
At the cold end of air preheater, air temperature is ambient temperature (not considering the temperature rise that pressure fan is brought), generally Be about 25 DEG C even lower, and flue gas is usually about 180 DEG C the highest, and the two temperature difference is up to more than 150 DEG C;At coal gas The cold end of preheater, cooled coal gas temperature is relatively low, usually about 35 DEG C even lower, and flue gas is usually about 140 DEG C even Higher, the two temperature difference is up to more than 100 DEG C.By based on the second law of thermodynamicsAnalysis theories understands, and transmits at heat Cheng Zhong, due to the existence of the not irreversible process such as isothermal heat transfer and friction loss, heat is when high temp objects is transmitted to cryogenic object There is bigger heat exchangeDamage, and heat transfer temperature difference is the biggest, heat exchangeDamage the biggest, therefore flue gas and air, coal gas and flue gas Between the biggest heat transfer temperature difference will cause heat exchanger heat exchangeLoss is relatively big, causes flue gas can fill not with the utilization of energy Point.In order to improve the utilization rate of fume afterheat, need to reduce the heat transfer temperature difference of heat exchanger, reduce heat exchangeDamage.
According to based on the second law of thermodynamicsAnalysis theories and cascaded utilization of energy principle, use different temperatures grade The air of flue gas different temperatures grade and coal gas, flue gas air heat-exchange system and flue gas coal gas heat-exchange system are divided equally High temperature and low temperature two stage arrangement, two-stage air heat exchanger and gas change heater are series flow.Cold air is through preposition low Warm air preheater enters the air preheater of routine after being heated to uniform temperature;Cooled coal gas is through preposition Cryogenic air preheating Device enters the gas preheater of routine after being heated to uniform temperature, complete the omnidistance heating of air and coal gas.
The forward type low-temperature air preheater and the forward type low temperature coal gas preheater that arrange can make to be in high-temperature flue gas section The entrance gas temperature of the entering air temperature of regular air preheater and conventional gas preheater raises, so that conventional coal gas The exit gas temperature of preheater raises, in order to utilize the most high-grade fume afterheat of this part, in forward type Cryogenic air Arranging one-level low-pressure coal saver before preheater and forward type low temperature coal gas preheater, the flue gas higher first with temperature heats Steam turbine condenses water, has squeezed the regenerative steam in low-pressure heater due to the rising of condensing water temperature, and that is squeezed draws gas Expansion work in steam turbine, adds the generated energy of unit.After low-pressure coal saver absorbs heat, the flue gas of cooling enters back into preposition Formula low-temperature air preheater and forward type low temperature coal gas preheater preheat cold air and cooled coal gas, reduce in forward type heat exchanger Heat transfer temperature difference between flue gas and air and flue gas and coal gas, and air after preheating and coal gas to respectively enter regular air pre- Hot device and conventional gas preheater make again the heat transfer temperature difference of regular air preheater and conventional gas preheater reduce, thus logical The progressive solution crossing air and coal gas decreases flue gas-air heat-exchange system and the heat exchange of flue gas-coal gas heat-exchange systemDamage, carry The high effective rate of utilization of fume afterheat.
In order to overcome the deficiencies in the prior art, and realizing the degree of depth recovery and utilization technology of above-mentioned fume afterheat, the present invention carries Supply a kind of Blast Furnace Gas-fired Boiler fume afterheat advanced recycling system, it is achieved the cascade utilization of energy, reduce heat exchangeDamaging, and reduce exhaust gas temperature further, increase the generated energy of gas-driven generator group, the degree of depth recycles blast furnace coal steam pot The fume afterheat of stove.
The technical scheme is that, a kind of Blast Furnace Gas-fired Boiler fume afterheat advanced recycling system, including Regular air preheater, conventional gas preheater, low-pressure coal saver, also include that forward type low-temperature air preheater and forward type are low Temperature gas preheater;Wherein:
Regular air preheater, conventional gas preheater and low-pressure coal saver sequentially connect in fume side, and low pressure saves coal The smoke outlet of device be divided into two-way respectively with gas approach end and the forward type low temperature coal gas of forward type low-temperature air preheater The gas approach end of preheater is connected;The air intlet end of regular air preheater and the air of forward type low-temperature air preheater The port of export is connected;The conventional gas inlet end of gas preheater is connected with the gas exit end of forward type low temperature coal gas preheater.
Present invention achieves the progressive solution of air, it is pre-that the cold air of entrance steam generator system is introduced into forward type Cryogenic air Hot device is by the smoke pre-heating of lower temperature, and the air after preheating carries out heat exchange in entering back into conventional air preheater, makes cigarette Heat transfer temperature difference between gas and air reduces, so that the heat exchange of flue gas-air heat-exchange systemDamage and reduce, in equal heat exchange amount Under can gather in the crops more available energy, it is achieved the step Appropriate application of gas energy grade;
Achieving again the progressive solution of coal gas, the cooled coal gas entering steam generator system is introduced into forward type low temperature coal gas preheater By the smoke pre-heating of lower temperature, the coal gas after preheating enter back into routine gas preheater in carry out heat exchange, make flue gas with Heat transfer temperature difference between coal gas reduces, so that the heat exchange of flue gas-coal gas heat-exchange systemDamage and reduce, energy under equal heat exchange amount Enough gather in the crops more available energy, it is achieved the step Appropriate application of gas energy grade;
Further increasing fume afterheat utilization rate, the flue gas that conventional gas preheater is discharged first flows into low-pressure coal saver and uses Condensation water in heating Steam Turbine Regenerative System, condenses after water heats up and returns thermodynamic system of steam tur, decrease steam turbine low Regenerative steam amount in pressure heater, and drawing gas of saving can continue acting in steam turbine so that unit is at as-fired coal gas Measure constant in the case of can increase the generated energy of steam turbine generator, in like manner, in the case of steam turbine generator generated energy is constant then The blast furnace coal tolerance that gas-driven generator group consumes can be saved;Additionally, arrange low-pressure coal saver to reduce again forward type Cryogenic air Preheater and the input gas temperature of forward type low temperature coal gas preheater flue gas side, for flue gas-air heat-exchange system and flue gas-coal The classification heat exchange of gas heat-exchange system creates advantage, reduces its heat transfer temperature difference, reduces its heat exchangeDamage.
Technical scheme can also be made the most perfect:
Preferably, the water side-entrance of described low-pressure coal saver accepts to enter from Steam Turbine Regenerative System mesolow heater Condensation water at Kou, the water that condenses after heating is imported the outlet condensation Jellyfish pipe of low-pressure heater by water side outlet, and under inflow One-level bleeder heater.
Preferably, the water side-entrance pipeline of described low-pressure coal saver is provided with condensate booster pump, is used for overcoming pipeline And the resistance that heat exchanger brings.
Preferably, described conventional gas preheater, forward type low temperature coal gas preheater all use heat-pipe heat exchanger.
Preferably, described regular air preheater uses box type preheater.
Preferably, described forward type low-temperature air preheater uses heat-pipe heat exchanger.
Preferably, described low-pressure coal saver uses surface-type heat exchanger, or uses heat-pipe heat exchanger, optimally uses Surface-type heat exchanger.
Preferably, the flue gas that described forward type low-temperature air preheater and described forward type low temperature coal gas preheater are discharged mixes Air is entered through being boosted by air-introduced machine and be evacuated to chimney after conjunction.
Present invention achieves the cascade utilization of energy, decrease flue gas-air heat-exchange system, flue gas-coal gas heat-exchange system Heat exchangeDamage, improve the effective rate of utilization of fume afterheat;Add steam turbine to exert oneself, improve sending out of gas-driven generator group Electricity;Reduce further exhaust gas temperature, reclaimed residual heat from boiler fume to a greater degree, there is preferable economic benefit.
3. beneficial effect
Compared with prior art, employing the invention have the advantages that
1) achieving the progressive solution of air, the cold air entering steam generator system is introduced into forward type low-temperature air preheater By the smoke pre-heating of lower temperature, carry out heat exchange in then entering back into the air preheater of routine, make between flue gas and air Heat transfer temperature difference reduce, so that the heat exchange of flue gas-air heat-exchange systemDamage and reduce so that can gather in the crops under equal heat exchange amount More available energy, it is achieved the cascade utilization of gas energy grade.
2) achieving the progressive solution of coal gas, the cooled coal gas entering steam generator system is introduced into forward type low temperature coal gas preheater By the smoke pre-heating of lower temperature, carry out heat exchange in then entering back into the gas preheater of routine, make between flue gas and coal gas Heat transfer temperature difference reduce, so that the heat exchange of flue gas-coal gas heat-exchange systemDamage and reduce so that can gather in the crops under equal heat exchange amount More available energy, it is achieved the cascade utilization of gas energy grade.
3) flue gas that conventional gas preheater is discharged flows into low-pressure coal saver for heating coagulating in Steam Turbine Regenerative System Bear water, condense after water heats up and return thermodynamic system of steam tur, decrease the regenerative steam amount in steam turbine low-pressure heater, and save Drawing gas of saving can continue acting in steam turbine so that unit can increase turbine generator in the case of as-fired coal tolerance is constant The generated energy of machine, in like manner, then can save the blast furnace that gas-driven generator group consumes in the case of steam turbine generator generated energy is constant Coal gas amount;Additionally, arrange low-pressure coal saver to reduce again forward type low-temperature air preheater and forward type low temperature coal gas preheater The input gas temperature of fume side, the classification heat exchange for flue gas-air heat-exchange system and flue gas-coal gas heat-exchange system has created Profit condition, reduces its heat transfer temperature difference, reduces its heat exchangeDamage.
In sum, present invention achieves the cascade utilization of energy, decrease flue gas-air heat-exchange system, flue gas-coal gas The heat exchange of heat-exchange systemDamage, improve the effective rate of utilization of fume afterheat;Add steam turbine to exert oneself, improve coal gas generating The generated energy of unit;Reduce further exhaust gas temperature, reclaimed residual heat from boiler fume to a greater degree, there is preferable economy Benefit.
4. accompanying drawing explanation
Fig. 1 is the structural representation of prior art.
Fig. 2 is the structural representation of a kind of Blast Furnace Gas-fired Boiler flue gas heat recovery system provided by the present invention Figure.
Wherein: 1, boiler, 2, regular air preheater, 3, conventional gas preheater, 4, air-introduced machine, 5, chimney, 6, low pressure Economizer, 7, forward type low-temperature air preheater, 8, forward type low temperature coal gas preheater, 9, low-pressure heater, 10, condense water liter Press pump.
5. detailed description of the invention
The present invention will be further described with specific embodiment below in conjunction with the accompanying drawings:
As in figure 2 it is shown, a kind of Blast Furnace Gas-fired Boiler fume afterheat advanced recycling system, pre-including regular air Hot device 2, conventional gas preheater 3, low-pressure coal saver 6, forward type low-temperature air preheater 7 and forward type low temperature coal gas preheater 8, wherein:
Regular air preheater 2, conventional gas preheater 3 and low-pressure coal saver 6 sequentially connect in fume side, and low pressure saves The smoke outlet of coal device 6 be divided into two-way respectively with gas approach end and the forward type low temperature of forward type low-temperature air preheater 7 The gas approach end of gas preheater 8 is connected;The air intlet end of regular air preheater 2 and forward type low-temperature air preheater The air outlet slit end of 7 is connected;The conventional gas inlet end of gas preheater 3 goes out with the coal gas of forward type low temperature coal gas preheater 8 Mouth end is connected.
Present invention achieves the progressive solution of air, it is pre-that the cold air of entrance steam generator system is introduced into forward type Cryogenic air Hot device 7, by the smoke pre-heating of lower temperature, carries out heat exchange in then entering back into the air preheater 2 of routine, makes flue gas with empty Heat transfer temperature difference between gas reduces, so that the heat exchange of flue gas-air heat-exchange systemLoss reduces so that under equal heat exchange amount More available energy can be gathered in the crops, it is achieved the cascade utilization of gas energy grade;
Achieving again the progressive solution of coal gas, the cooled coal gas entering steam generator system is introduced into forward type low temperature coal gas preheater 8 by the smoke pre-heating of lower temperature, carries out heat exchange in then entering back into the gas preheater 3 of routine, make flue gas and coal gas it Between heat transfer temperature difference reduce, so that the heat exchange of flue gas-coal gas heat-exchange systemDamage and reduce so that can receive under equal heat exchange amount Obtain more available energy, it is achieved the cascade utilization of gas energy grade;
Further increasing utilization rate of waste heat, conventional gas preheater 3 is discharged flue gas and is flowed into low-pressure coal saver 6 for heating Condensation water in Steam Turbine Regenerative System, condenses after water heats up and returns thermodynamic system of steam tur, decreases steam turbine low-pressure heating Regenerative steam amount in device, and drawing gas of saving can continue acting in steam turbine so that unit is constant in as-fired coal tolerance In the case of can increase the generated energy of steam turbine generator, in like manner, then can save in the case of steam turbine generator generated energy is constant The blast furnace coal tolerance that gas-driven generator group consumes;Additionally, arrange low-pressure coal saver 6 to reduce again forward type low-temperature air preheater 7 and the input gas temperature of forward type low temperature coal gas preheater 8 fume side, change for flue gas-air heat-exchange system and flue gas-coal gas The classification heat exchange of hot systems creates advantage, reduces its heat transfer temperature difference, reduces its heat exchangeDamage.
Technical scheme can also be made the most perfect:
Preferably, described conventional gas preheater 3 and forward type low temperature coal gas preheater 8 all use heat-pipe heat exchanger, Heat-pipe heat exchanger has exhaust gases passes and gas passage, and by intermediate seal dividing plate separately, flue gas and coal gas are respectively through cigarette Gas passage and air duct, utilize heat pipe to complete the exchange of heat during circulation, use the benefit of heat-pipe heat exchanger It is, on the one hand, blast furnace gas has the features such as inflammable, explosive, poisonous, if using surface-type heat exchanger, once heat exchanger Pipeline leaks, and easily causes serious accident, and uses heat-pipe heat exchanger can eliminate this hidden danger well, really Protect the safe and reliable operation of system;On the other hand, the heat transfer coefficient of heat pipe is high, and it is little that heat-pipe heat exchanger has volume, weight Gently, compact conformation, the advantages such as floor space is little, it is highly suitable for the situation that heat transfer space is limited.
Preferably, described forward type low-temperature air preheater 7 uses heat-pipe heat exchanger, and it is advantageous in that, with traditional Box type structure is compared, and heat-pipe heat exchanger can save flue area shared by heat-exchange system, and owing to forward type low temperature is empty Flue gas in flue residing for air preheater 7 is in lower temperature levels, uses heat-pipe heat exchanger to be better able to guarantee that heat exchange is imitated Really.
Described regular air preheater 2 can use traditional box type preheater, it would however also be possible to employ heat pipe-type preheater, This example preferably box type preheater.
Described low-pressure coal saver 6 can use the surface-type heat exchanger of routine, it would however also be possible to employ heat-pipe heat exchanger, this reality Example preferably surface-type heat exchanger.
The water side-entrance of described low-pressure coal saver 6 accepts from Steam Turbine Regenerative System mesolow heater 9 porch Condensing water, the water that condenses after heating is imported the outlet of low-pressure heater 9 and condenses Jellyfish pipe by water side outlet, and flows into next stage and return Hot heater.
It is provided with condensate booster pump 10 on the water side-entrance pipeline of described low-pressure coal saver 6, is used for overcoming pipeline and changing The resistance that hot device brings.
The flue gas that described forward type low-temperature air preheater 7 and described forward type low temperature coal gas preheater 8 are discharged first is carried out Mixing, mixed flue gas is sent into chimney 5 after being boosted by air-introduced machine 4, is finally entered air.
The technological principle of the present invention is as follows:
From the high-temperature flue gas of boiler after regular air preheater 2 and conventional gas preheater 3 absorbing and cooling temperature, advanced Entering low-pressure coal saver 6 and carry out heat exchange, be then divided into two-way in low-pressure coal saver 6 outlet, a road enters forward type Cryogenic air Preheater 7, a road enters forward type low temperature coal gas preheater 8, forward type low-temperature air preheater 7 and low temperature coal gas preheater 8 Exiting flue gas mixing after enter air together;
Cold air after boiler fan of hanging oneself pressurization is introduced into forward type low-temperature air preheater 7 and preheats, in advance Hot-air entrance after heat is in the regular air preheater 2 of high-temperature flue gas section and carries out post bake, the most again by hot air duct Deliver to boiler furnace;Cooled coal gas from blast furnace coal gas holder is introduced into forward type low temperature coal gas preheater 8 and preheats, after preheating Heating gas enter and be in the conventional gas preheater 3 of high-temperature flue gas section and carry out post bake, sent by heating gas pipeline the most again To boiler furnace;
Condensation moisture from Steam Turbine Regenerative System flows out and is partly into described low-pressure coal saver 6, condenses water low Pressure economizer 6 is condensed Jellyfish pipe by the outlet importing low-pressure heater 9 after flue gas, and flows into the heating of next stage backheat Device.
Owing to being provided with forward type low-temperature air preheater 7 and forward type low temperature coal gas preheater 8, regular air preheater The entrance gas temperature of the entering air temperature of 2 and conventional gas preheater 3 all has certain lifting, can make regular air preheater 2 and the heat transfer temperature difference of conventional gas preheater 3 and heat exchange amount reduce, cause the exit gas temperature of conventional gas preheater 2 (i.e. The input gas temperature of low-pressure coal saver) raise, its temperature can be controlled during design at 160 DEG C~180 DEG C, this flue gas enters low Pressure economizer 6 heats the condensation water of Steam Turbine Regenerative System, low-pressure coal saver 6 exit gas temperature about control at 120 DEG C~ 140 DEG C, (input gas temperature of forward type low-temperature air preheater 7 and forward type low temperature coal gas preheater 8 is too else if Low, can cause and change shortage of heat or heat exchange area to increase), to guarantee downstream forward type low-temperature air preheater 7 and preposition Formula low temperature coal gas preheater 8 possesses certain heat transfer temperature difference, makes flue gas not violate thermal conduction study rule it is also contemplated that thermodynamics Two laws (Analytic process) temperature conditions under enter forward type low-temperature air preheater 7 and forward type low temperature coal gas preheater 8 Preheated air and coal gas, the flue-gas temperature finally discharged is then by forward type low-temperature air preheater 7 and forward type low temperature coal gas (depending on site layout project condition, flue to be considered may utilize space and heat exchanger in the restriction of the heat exchange area of preheater 8 The factors such as consumables cost), it can be controlled in 80 DEG C~90 DEG C during design.
Low-pressure heater 9 should be chosen according to the temperature levels of low-pressure coal saver fume side, is ensureing flue gas and is condensing water Between there is certain heat transfer temperature difference on the basis of, preferentially choose more higher leveled low-pressure heater, the most heated solidifying Bear water the extracted steam from turbine that just can squeeze higher pressure grade when returning Steam Turbine Regenerative System, and the steam of higher quality possesses Preferably do work ability, therefore, it is possible to obtain more preferably power benefit.
The operation of boiler induced-draft fan can be produced by the fume afterheat advanced recycling system that the present invention provides to be affected: a side Face, fume afterheat advanced recycling system reduces the flue-gas temperature entering air-introduced machine, causes the working flow of air-introduced machine to subtract Little;On the other hand, fume afterheat advanced recycling system adds the drag overall of flue gas pipeline, causes the work pressure of air-introduced machine Head improves.For new construction, have contemplated that forward type low temperature coal gas preheater and described low-pressure coal saver when model selection of ID fan , so there is not the unmatched problem of air-introduced machine in the impact brought;And for improvement project, due to model selection of ID fan before also Do not count forward type low temperature coal gas preheater and air-introduced machine volume flow that described low-pressure coal saver brings and pipe resistance change, So need to adjust whether exerting oneself of air-introduced machine disclosure satisfy that the service requirement of system after transformation, and air-introduced machine is the most still located Run in efficient district, to determine the need for carrying out Induced Draft Fan or setting up booster fan etc. in flue.
Present invention achieves the cascade utilization of energy, decrease flue gas-air heat-exchange system, flue gas-coal gas heat-exchange system Heat exchangeDamage, improve the effective rate of utilization of fume afterheat;Add steam turbine to exert oneself, improve sending out of gas-driven generator group Electricity;Reduce further exhaust gas temperature, reclaimed residual heat from boiler fume to a greater degree, there is preferable economic benefit.

Claims (6)

1. a Blast Furnace Gas-fired Boiler fume afterheat advanced recycling system, including regular air preheater, conventional coal Air preheater, low-pressure coal saver, it is characterised in that also include forward type low-temperature air preheater and the preheating of forward type low temperature coal gas Device, wherein: regular air preheater, conventional gas preheater and low-pressure coal saver sequentially connect in fume side, and low pressure saves coal The smoke outlet of device be divided into two-way respectively with gas approach end and the forward type low temperature coal gas of forward type low-temperature air preheater The gas approach end of preheater is connected;The air intlet end of regular air preheater and the sky of forward type low-temperature air preheater The gas port of export is connected;The gas inlet end of conventional gas preheater and the gas exit end phase of forward type low temperature coal gas preheater Even;The water side-entrance of described low-pressure coal saver accepts from the condensation at Steam Turbine Regenerative System mesolow calorifier inlets Water, the water that condenses after heating is imported the outlet of low-pressure heater and condenses Jellyfish pipe, and flows into next stage backheat and add by water side outlet Hot device;Through by drawing after the flue gas mixing that described forward type low-temperature air preheater and described forward type low temperature coal gas preheater are discharged Blower fan boosts and is evacuated to chimney and enters air.
2. based on a kind of Blast Furnace Gas-fired Boiler fume afterheat advanced recycling system described in claim 1, its feature It is, the water side-entrance pipeline of described low-pressure coal saver is provided with condensate booster pump, be used for overcoming pipeline and heat exchanger band The resistance come.
3. based on a kind of Blast Furnace Gas-fired Boiler fume afterheat advanced recycling system described in claim 1, its feature Being, described conventional gas preheater, forward type low temperature coal gas preheater all use heat-pipe heat exchanger.
4. based on a kind of Blast Furnace Gas-fired Boiler fume afterheat advanced recycling system described in claim 1, its feature Being, described regular air preheater uses box type preheater.
5. based on a kind of Blast Furnace Gas-fired Boiler fume afterheat advanced recycling system described in claim 1, its feature Being, described forward type low-temperature air preheater uses heat-pipe heat exchanger.
6. based on a kind of Blast Furnace Gas-fired Boiler fume afterheat advanced recycling system described in claim 1, its feature Being, described low-pressure coal saver uses surface-type heat exchanger, or uses heat-pipe heat exchanger.
CN201310313493.XA 2013-07-24 2013-07-24 A kind of Blast Furnace Gas-fired Boiler fume afterheat advanced recycling system Expired - Fee Related CN103353121B (en)

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CN103994667B (en) * 2014-05-22 2016-02-24 西安交通大学 A kind of heater for rolling steel residual neat recovering system
CN104457300B (en) * 2014-12-12 2016-08-24 上海宝钢节能环保技术有限公司 The comprehensive stepped utilization method of industrial waste heat resource
CN104534894A (en) * 2015-01-07 2015-04-22 中冶华天工程技术有限公司 Conversion and utilization system of flue gas waste heat resources
CN107023852A (en) * 2016-07-11 2017-08-08 胡建廷 Transfiguration mapping heating agent flue gas/air heat-exchanging device

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