CN102620310A - Air pre-heater system preventing low-temperature corrosion and air pre-heating method - Google Patents
Air pre-heater system preventing low-temperature corrosion and air pre-heating method Download PDFInfo
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- CN102620310A CN102620310A CN2012101064317A CN201210106431A CN102620310A CN 102620310 A CN102620310 A CN 102620310A CN 2012101064317 A CN2012101064317 A CN 2012101064317A CN 201210106431 A CN201210106431 A CN 201210106431A CN 102620310 A CN102620310 A CN 102620310A
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
Provided are an air pre-heater system preventing low-temperature corrosion and an air pre-heating method. The air pre-heater system comprises a heat exchange system and a heating medium system. The heat exchange system comprises a smoke-air heat exchanger, a smoke-heating medium heat exchanger and a heating medium-air heat exchanger. The smoke-air heat exchanger and the smoke-heating medium heat exchanger are sequentially arranged in a heating furnace flue along the smoke flowing direction, and the heating medium-air heat exchanger is arranged outside the heating furnace flue. The smoke-heating medium heat exchanger, the heating medium-air heat exchanger and a heating medium system are connected in series to form a circulating system, smoke heat is transferred to a heating medium through the smoke-heating medium heat exchanger, an air inlet of the heating medium-air heat exchanger is connected with a fan, and outside air is subjected to primary heating of the heating medium-air heat exchanger, then enters the smoke-air heat exchanger to enable the air temperature to be higher than the dew-point temperature of sulfur-containing smoke and is used for supporting combustion after being subjected to secondary heating of high-temperature smoke. The phenomenon of low-temperature corrosion can be prevented, and accordingly an air pre-heater can run on line for a long period.
Description
Technical field
The present invention relates to a kind of waste heat recovery system of heating furnace heat transmission equipment, but relate in particular to a kind of air preheater system and corresponding air preheat method that is used for recycling flue gas waste heat and anti-low-temperature corrosion.
Background technology
Air preheater is to utilize the heat fuel combustion required air of boiler tail flue gas to improve the heat-exchange apparatus of boiler thermal output.Generally abbreviate air preheater as, can be divided into two kinds of box type, swingings; Bobbin carriage preheater operation principle is comparatively simple, and flue gas is from bobbin carriage outer flow warp, and air passes through from bobbin carriage inside, and is through temperature difference different heat transfer, identical with principles such as economizer, superheaters.
The operation principle of rotary preheater is: the preheater rotor part is made up of the heat transfer element of tens thousand of meters, and when air preheater slowly rotates, the reverse alternating current of flue gas and air is through air preheater.Heat accumulating element absorbs heat in fume side, in the air side heat release, thereby reaches the reduction exhaust gas temperature, improves the preheating effect of hot blast temperature.
Existing air preheater is easy to generate cold end corrosion, has influenced the service life of air preheater, has further influenced the service life of boiler.Cold end corrosion is exactly when heated surface at the end of boiler (economizer, air preheater etc.) when tube wall temperature is lower than flue gas dew point, contains the corrosion that the steam of sulfuric acid condenses and caused at wall in the flue gas.
The formation of cold end corrosion: the combustion of sulfur in the fuel generates sulfur dioxide (S+O
2=SO
2), sulfur dioxide further oxidation under the effect of catalyst generates sulfur trioxide (2SO
2+ O
2=2SO
3), SO
3Generate sulfuric acid vapor (SO with the water vapour in the flue gas
3+ H
2O=H
2SO
4), the existence of sulfuric acid vapor significantly raises the dew point of flue gas, and because the temperature of air preheater air is lower, the flue-gas temperature of preheater section is not high, and wall temperature often is lower than flue gas dew point, and sulfuric acid vapor will condense on the air preheater heating surface like this, causes sulfuric acid corrosion.
Cold end corrosion often occurs on the air preheater, but sulfur content is higher in fuel, excess air coefficient is bigger, SO in the flue gas
3Content is higher, and dew point raises, and feed temperature is when lower (the steam turbine height adds inactive), and the economizer tube also cold end corrosion might take place.
In recent years, along with the rising of petroleum chemical enterprise's processing sulfur content in crude oil, the SO in the flue gas of heating furnace
xIncrease, make the flue gas acid dew point temperature raise, cause waste heat recovery system of heating furnace heat transmission equipment corrosion aggravation, had a strong impact on the heating furnace long-period stable operation.
What air preheater anti-low-temperature corrosion technology adopted at present is: heat pipe preheater, ND steel tubular air heater, enamel pipe regenerative air heater, Pyrex tubular air preheater etc.; These several kinds technology all have pluses and minuses separately; But they all have a problem that can't overcome is exactly all to realize air preheater long period on-line operation; Long periods of time in order is no more than 3 years; Serious cold end corrosion or device damage will take place in five, six months in the shortest on-line operation, caused air preheater to be scrapped.
Wherein, the operation principle of heat pipe preheater is: inject 1/3 vaporizable liquid in will managing, then with its sealing that is evacuated; Pipe divides upper and lower two sections; Use the tube sheet spaced apart, the hypomere of the pipe flue gas that becomes popular utilizes flue gas heat to come the liquid in the heating tube; Make its evaporation and rise to the pipe epimere and heated air conducts heat; Emit gas after the latent heat of vaporization and be condensed into the hypomere that drops to pipe behind the liquid again and continue and hot flue gas heat exchange, rise to epimere again after the evaporation with heated air conducts heat, thereby so reciprocation cycle realization flue gas is to the heating of air.Because of cold air does not directly carry out heat exchange with hot flue gas; Thereby avoided the generation of cold end corrosion phenomenon; But thereby it is destroyed in the vacuum that the long-term operation air is inhaled in causing in the heat exchanger tube managing; Make the steam latent heat of the interior vaporization of pipe not pass on the tube wall, thereby air can not be caused this heat pipe preheater to lose efficacy by the continuation heating.
For existing ND steel tubular air heater, enamel pipe regenerative air heater, Pyrex tubular air preheater commonly used all is that flue gas and air pass through heat exchange between tube wall; Flue gas flows in managing; Air through the above lateral flow of secondary, is realized the heat exchange between air and the flue gas outside pipe.
Wherein, The main raw material(s) of ND steel tubular air heater is the ND steel; The ND steel is a kind of material of resisting sulfide corrosion of steel mill's exploitation; But costing an arm and a leg of ND steel steel pipe, and this material actual on-line operation time under the cold end corrosion environment also can not surpass 3 years and will low-temperature dew point corrosion take place and damage.
And the enamel pipe regenerative air heater is to plate one deck enamel in the pipe side that flue gas contacts to prevent low-temperature dew point corrosion; But cause influence such as receive that in practical application coating became uneven, pipe postwelding coating are destroyed, low-temperature dew point corrosion also takes place after long a period of time and damages in actual on-line operation in succession.
The Pyrex tubular air preheater in practical application, often tube sheet takes place and borosilicate glass tube is poorly sealed, the leakage cigarette, leak out and glass tube former thereby on-line operation for a long time such as frangible.
Summary of the invention
The objective of the invention is to solve following technical problem:
One, box type air preheater commonly used is lower because of the temperature of air to be heated; Sometimes even be lower than the sulfur-containing smoke gas dew-point temperature; Thereby make the fume side tube wall easily because of cold end corrosion is destroyed, thereby cause shutdown maintenance, even the air preheater problem of scrapping;
Two, adopt heat pipe preheater in long-term operation; Thereby the vacuum that air is prone to be inhaled in causing managing in the heat exchanger tube is destroyed; Make the steam latent heat of the interior vaporization of pipe can not pass on the tube wall, air can not be continued heating, the problem that causes this heat pipe preheater to lose efficacy;
Three, adopt the ND steel tubular air heater that its manufacturing cost is raise, and also low-temperature dew point corrosion can take place after the length running time, thus the problem that causes air preheater to damage;
Four, adopt the enamel pipe regenerative air heater be destroyed easily by the easy became uneven of coating, pipe postwelding coating, cause actual on-line operation also in succession low-temperature dew point corrosion to take place after long a period of time and the problem damaged;
Five, adopt the Pyrex tubular air preheater, then in practical application, often tube sheet takes place and borosilicate glass tube is poorly sealed, the leakage cigarette, leak out and the glass tube former thereby problem of on-line operation for a long time such as frangible;
Six, existing air preheater can not effectively solve the cold end corrosion problem, makes troubles to the use of air preheater and boiler, has increased use, the maintenance cost of air preheater and boiler.
For solving the problems of the technologies described above; The present invention provides a kind of air preheater system of anti-low-temperature corrosion, and it can effectively prevent cold end corrosion, so that air preheater on-line operation for a long time; Reduce the cost that air preheater and boiler use, keep in repair, improved boiler operation reliability.
For reaching this purpose, the present invention adopts following technical scheme:
A kind of air preheater system of anti-low-temperature corrosion comprises heat-exchange system, heating agent system;
Said heat-exchange system comprises flue gas-air heat exchanger, flue gas-heating agent heat exchanger, heating agent-air heat exchanger; Said flue gas-air heat exchanger, said flue gas-heating agent heat exchanger are successively set in the hot stove flue along flue gas flow direction, and said heating agent-air heat exchanger is arranged on outside the hot stove flue;
Said flue gas-heating agent heat exchanger, heating agent-air heat exchanger and heating agent system compose in series the circulatory system; Through said flue gas-heating agent heat exchanger flue gas heat is passed to heating agent; The air intake of said heating agent-air heat exchanger connects blower fan; Extraneous air gets into flue gas-air heat exchanger after heating agent-air heat exchanger once heats, after the high-temperature flue gas post bake, be used for combustion-supporting.
Said heating agent system comprises circulating pump, expansion drum, holding vessel, and wherein circulating pump, expansion drum compose in series closed circuit through pipeline and flue gas-heating agent heat exchanger, heating agent-air heat exchanger; Said holding vessel connects expansion drum and closed circuit through the valve group.
Further, the heating agent arrival end and the port of export of said flue gas-heating agent heat exchanger are provided with bypass regulator valve.Regulate the heat medium temperature that gets into heating agent-air heat exchanger, make it to be higher than the flue gas dew point temperature.
Further, said valve group is connected with gear pump, is used for the additional and derivation of heating agent in the heating agent system.
Special, said heating agent system heating agent adopts conduction oil.
Special, said heating agent system heating agent adopts glycol water.
A kind of method of air preheat is provided simultaneously, flue gas heat is passed to heating agent through flue gas-heating agent heat exchanger; Utilize the heating agent system will introduce air and once heat, make air themperature be heated to above the flue gas dew point temperature, enter into flue gas-air heat exchanger again and utilize high-temperature flue gas further to be heated to needed hot air temperature through heating agent-air heat exchanger.
Through heating agent is higher than dew-point temperature in the sulfur-containing smoke gas with the waste heat flue gas heating until temperature; Again with the heating agent heats cold air after the heating; Make the air themperature after being heated be higher than dew-point temperature in the sulfur-containing smoke gas, and then be sent to and further be heated to needed hot air temperature in the waste heat flue gas again, be higher than dew-point temperature in the sulfur-containing smoke gas because get into the temperature of the air of flue gas-air heat exchanger; So the phenomenon of cold end corrosion just can not occur; So just prolonged the service life of equipment, and the waste heat flue gas has further been lowered the temperature, the flue-gas temperature that is drained into atmosphere is reduced through flue gas-heating agent heat exchanger; Not only practice thrift the energy, also protected environment.
Preferably, said heating agent adopts conduction oil, and conduction oil is a kind of transmission medium of heat; Because it has homogeneous heating, temperature adjustment control temperature accurately can produce high temperature under low-steam pressure; Heat-transfer effect is good, and is energy-conservation, characteristics such as carries and easy to operate; Be widely used in various occasions in recent years, and its purposes and consumption are more and more.
Preferably, said heating agent adopts glycol water.
Beneficial effect of the present invention is: through the heating agent in flue gas-heating agent heat exchanger is used the waste heat flue gas heating; Be higher than dew-point temperature in the sulfur-containing smoke gas until temperature; Again with the heating agent heats cold air after the heating; Make the air themperature after being heated be higher than dew-point temperature in the sulfur-containing smoke gas, and then be sent to and further be heated to needed hot air temperature in the waste heat flue gas again, the temperature that gets into the air of flue gas-air heat exchanger like this is higher than dew-point temperature in the sulfur-containing smoke gas; The phenomenon that has effectively prevented cold end corrosion takes place; Realized macrocyclic on-line operation, avoided the damage of equipment and damaged the back, also saved because of often changing the expense of buying new air preheater because of the economic loss that maintenance needs blowing out to bring; Through flue gas-heating agent heat exchanger the waste heat flue gas is further lowered the temperature, the flue-gas temperature that is drained into atmosphere is reduced, not only practiced thrift the energy, also protected environment; Through between the inlet of flue gas-heating agent heat exchanger and flue gas-heating agent heat exchanger exit, connecting bypass regulator valve; Can make the heating agent in flue gas-heating agent heat exchanger repeatedly carry out heat exchange with the waste heat flue gas; Thereby make the temperature of the heating agent of entering heating agent-air heat exchanger always be higher than dew-point temperature in the sulfur-containing smoke gas; Further strengthen the heat exchange of the air in the watertight aircase, guarantee that the air themperature that gets into flue gas-air heat exchanger is higher than dew-point temperature in the sulfur-containing smoke gas, the contrast prior art; This air preheater system can effectively prevent cold end corrosion; So that air preheater on-line operation for a long time, reduced that air preheater and boiler use, the cost of maintenance, improved boiler operation reliability.
Description of drawings
But Fig. 1 is the structural representation of the air preheater system of anti-low-temperature corrosion shown in the present.
Among the figure:
1, flue; 2, heating agent-air heat exchanger; 3, flue gas-air heat exchanger; 4, flue gas-heating agent heat exchanger; 5, chimney; 6, bypass regulator valve; 7, centrifugal blower;
8, expansion drum; 81, first inlet; 82, second inlet; 83, first outlet; 84, second outlet;
9, holding vessel; 10, centrifugal pump; 11, storage barrel; 12, gear pump.
The specific embodiment
As shown in Figure 1, the air preheater system of a kind of anti-low-temperature corrosion of the present invention comprises heat-exchange system, heating agent system;
Heat-exchange system comprises flue gas-air heat exchanger 3, flue gas-heating agent heat exchanger 4, heating agent-air heat exchanger 2; Flue gas-air heat exchanger 3, flue gas-heating agent heat exchanger 4 are arranged in the hot stove flue 1; And set gradually along flue gas flow direction, heating agent-air heat exchanger 2 is arranged on outside the hot stove flue 1;
The inlet of flue gas-heating agent heat exchanger 4 connects centrifugal pump 10 outputs, and the outlet of flue gas-heating agent heat exchanger 4 connects the heating agent inlet of heating agent-air heat exchanger 2, and the heating agent outlet of heating agent-air heat exchanger 2 connects the input of said centrifugal pump 10;
The air intake of heating agent-air heat exchanger 2 connects centrifugal blower 7, and the air outlet slit of heating agent-air heat exchanger 2 connects the inlet of flue gas-air heat exchanger 3, and the outlet of flue gas-air heat exchanger 3 connects hot burner.Through will with overheated flue gas heating agent being heated earlier, make the temperature of heating agent be higher than dew-point temperature in the sulfur-containing smoke gas, again with the heating agent heats cold air after the heating; Make the air themperature after being heated be higher than dew-point temperature in the sulfur-containing smoke gas; And then be sent to and further be heated to needed hot air temperature in the waste heat flue gas again, the temperature that gets into the air of flue gas-air heat exchanger 3 like this is higher than dew-point temperature in the sulfur-containing smoke gas, the phenomenon of cold end corrosion also just can not occur; Prolonged the service life of equipment; Reduce exhaust gas temperature, practiced thrift the energy, protected environment.
In the specific implementation, in order to guarantee to be higher than the sulfur-containing smoke gas dew-point temperature and conveniently to carry out temperature control, so preferably between the outlet of flue gas-heating agent heat exchanger 4 and inlet, a bypass regulator valve 6 is installed from the heat medium temperature that flue gas-heating agent heat exchanger 4 is gone out.
The heating agent system comprises expansion drum 8; Expansion drum 8 comprises first inlet, 81, second inlet, 82, first outlet, 83 and second outlet 84; First inlet 81 of expansion drum 8 connects the heating agent outlet of heating agent-air heat exchanger 2; With the heating agent of absorption portion expanded by heating, first outlet 83 of expansion drum 8 connects the input of centrifugal pump 10, to replenish the heating agent of absorbed part expanded by heating.
The heating agent system also comprises heating agent storage barrel 11, and heating agent storage barrel 11 is through the input of pipeline connection gear pump 12, and the output of gear pump 12 connects second inlet 82 of expansion drum 8 through pipeline.Through storage barrel 11 is set, when the heating agent of system lacks, can in time carry out heating agent and replenish, to guarantee the normal operation of system to whole system.
Second outlet 84 of expansion drum 8 is connected with holding vessel 9, and holding vessel 9 is through the input of pipeline connection gear pump 12, and the output of gear pump 12 connects second inlet 82 of expansion drum 8 through pipeline.Replenish not only can for the closed circuit heating agent through expansion drum 8 is set, can also solve the volumetric expansion problem that produces because of the heating agent heating.
Heating agent in the present embodiment is selected conduction oil for use, because conduction oil is a kind of transmission medium of heat, and it has homogeneous heating, and temperature adjustment control temperature accurately can produce high temperature under low-steam pressure, and heat-transfer effect is good, and is energy-conservation, conveying and characteristics such as easy to operate.
Heating agent is not limited only to conduction oil, as long as have homogeneous heating, heat-transfer effect is good, and conveying and easy to operate material all can be selected for use, such as heating agent can also be selected glycol water for use.
But the method for the anti-low-temperature corrosion of the air preheater system of the anti-low-temperature corrosion in the present embodiment; At first utilize the heating agent of flue gas heating from the heating agent system; Utilize the heating agent heats cold air after heating then; Make the air themperature after being heated be higher than dew-point temperature in the sulfur-containing smoke gas, so that heat exchange manifold does not produce cold end corrosion, the air after will heating again is sent to and further is heated to needed hot air temperature in the waste heat flue gas.Through the heating agent in flue gas-heating agent heat exchanger is used the waste heat flue gas heating; Be higher than dew-point temperature in the sulfur-containing smoke gas until temperature; Again with the heating agent heats cold air after the heating; Make the air themperature after being heated be higher than dew-point temperature in the sulfur-containing smoke gas, and then be sent to and further be heated to needed hot air temperature in the waste heat flue gas again, the temperature that gets into the air of flue gas-air heat exchanger like this is higher than dew-point temperature in the sulfur-containing smoke gas; The phenomenon that has effectively prevented cold end corrosion takes place; Realized macrocyclic on-line operation, avoided the damage of equipment and damaged the back, also saved because of often changing the expense of buying new air preheater because of the economic loss that maintenance needs blowing out to bring;
The concrete course of work is following:
One, heating agent:
Heating agent at first gets in flue gas-heating agent heat exchanger 4 through centrifugal pump 10; Carry out heat exchange with the waste heat flue gas; And then the heating agent inlet that gets into through heating agent-air heat exchanger 2 enters into heating agent-air heat exchanger 2; Carry out heat exchange with cold air; The heating agent part that heat exchange finishes is carried out recycle through getting into centrifugal pump 10 from the outlet of the heating agent of heating agent-air heat exchanger 2, under various operating modes, gets into the dew-point temperature that air themperature in the flue gas-air heat exchanger 3 all is higher than sulfur-containing smoke gas in order to guarantee heating furnace, in the outlet of flue gas-heating agent heat exchanger 4 with between entering the mouth bypass regulator valve 6 is set.
Heating agent another part that heat exchange finishes gets into the expansion drum 8 from heating agent-air heat exchanger 2; This moment is because heating agent causes the heating agent volumetric expansion owing to heating in heat exchanging process; Can reduce the heating agent expansion if heating agent is put into expansion drum 8, a part of heating agent flows out from second outlet 84 again, gets into centrifugal pump 10 and circulates; Another part heating agent gets in the holding vessel 9, and the heating agent that is carried out closed circuit by gear pump 12 injection expansion drums 8 replenishes.
Pipeline of directly linking gear pump 12 inputs in addition between second outlet 84 of expansion drum 8 and centrifugal pump 10; This is that heating agent is injected in the expansion drum 8 by gear pump 12 through this pipeline and regulates when the heating agent amount that gets into centrifugal pump 10 is higher than requirement.
When if the heating agent amount of whole system is lower than normal operation use amount, at this moment inject new heating agent through storage barrel 11, guarantee the normal operation of whole system.
Two, air
Cold air at first gets in heating agent-air heat exchanger 2 through centrifugal blower 7; In heating agent-air heat exchanger 2 cold air with carry out heat exchange from the high temperature heating agent of flue gas-heating agent heat exchanger 4; Make the temperature of air be higher than the dew-point temperature of sulfur-containing smoke gas; And then in the air outlet slit entering flue gas-air heat exchanger 3 by heating agent-air heat exchanger 2, carry out heat exchange with flue 1 interior waste heat flue gas, make the air in the flue gas-air heat exchanger 3 reach the needed air themperature of hot stove.
Three, flue gas
Flue gas washes away flue gas-air heat exchanger 3 and flue gas-heating agent heat exchanger 4 from top to bottom successively in heating furnace convection cell exhaust pass 1; Heat exchange through the two-stage heat exchanger; The temperature of flue gas is descended; Flue gas is discharged in the atmosphere along chimney 13 and (before entering atmosphere, also can carries out operations such as dedusting, here just not explanation in detail) then.
More than combine specific embodiment to describe know-why of the present invention.These are described just in order to explain principle of the present invention, and can not be interpreted as the restriction to protection domain of the present invention by any way.Based on the explanation here, those skilled in the art need not pay performing creative labour can associate other specific embodiment of the present invention, and these modes all will fall within protection scope of the present invention.
Claims (9)
1. the air preheater system of an anti-low-temperature corrosion is characterized in that, comprises heat-exchange system, heating agent system;
Said heat-exchange system comprises flue gas-air heat exchanger, flue gas-heating agent heat exchanger, heating agent-air heat exchanger; Said flue gas-air heat exchanger, said flue gas-heating agent heat exchanger are successively set in the hot stove flue along flue gas flow direction, and said heating agent-air heat exchanger is arranged on outside the hot stove flue;
Said flue gas-heating agent heat exchanger, heating agent-air heat exchanger and heating agent system compose in series the circulatory system; Through said flue gas-heating agent heat exchanger flue gas heat is passed to heating agent; The air intake of said heating agent-air heat exchanger connects blower fan; Extraneous air gets into flue gas-air heat exchanger after heating agent-air heat exchanger once heats, after the high-temperature flue gas post bake, be used for combustion-supporting.
2. but the air preheater system of anti-low-temperature corrosion according to claim 1; It is characterized in that; Said heating agent system comprises circulating pump, expansion drum, holding vessel, and wherein circulating pump, expansion drum compose in series closed circuit through pipeline and flue gas-heating agent heat exchanger, heating agent-air heat exchanger; Said holding vessel connects expansion drum and closed circuit through the valve group.
3. but the air preheater system of anti-low-temperature corrosion according to claim 1 is characterized in that, the heating agent arrival end and the port of export of said flue gas-heating agent heat exchanger are connected with bypass regulator valve.
4. but the air preheater system of anti-low-temperature corrosion according to claim 2 is characterized in that, said valve group is connected with gear pump, is used for the additional and derivation of heating agent in the heating agent system.
5. but according to the air preheater system of described any anti-low-temperature corrosion of claim 1 to 4, it is characterized in that said heating agent system heating agent adopts conduction oil.
6. but according to the air preheater system of described any anti-low-temperature corrosion of claim 1 to 4, it is characterized in that said heating agent system heating agent adopts glycol water.
7. an air preheat method is characterized in that: through flue gas-heating agent heat exchanger flue gas heat is passed to heating agent; Utilize the heating agent system will introduce air and once heat, make air themperature be heated to above the flue gas dew point temperature, enter into flue gas-air heat exchanger again and utilize high-temperature flue gas further to be heated to needed hot air temperature through heating agent-air heat exchanger.
8. an air preheat method according to claim 5 is characterized in that, said heating agent system heating agent adopts conduction oil.
9. air preheat method according to claim 6 is characterized in that, said heating agent system heating agent adopts glycol water.
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| CN107143869A (en) * | 2017-03-31 | 2017-09-08 | 浙江东氟塑料科技有限公司 | Flue gas heat indirect branch system |
| CN111536806A (en) * | 2020-05-11 | 2020-08-14 | 深圳市奥宇节能技术股份有限公司 | Water-borne flue gas waste heat utilization system with acid dew point online monitoring function |
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