CN201715542U - Two-stage flue gas-air heat exchanger system applied to fuel electric plant - Google Patents
Two-stage flue gas-air heat exchanger system applied to fuel electric plant Download PDFInfo
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- CN201715542U CN201715542U CN2010202470969U CN201020247096U CN201715542U CN 201715542 U CN201715542 U CN 201715542U CN 2010202470969 U CN2010202470969 U CN 2010202470969U CN 201020247096 U CN201020247096 U CN 201020247096U CN 201715542 U CN201715542 U CN 201715542U
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Abstract
The utility model provides a two-stage flue gas-air heat exchanger system applied to a fuel electric plant, which comprises a boiler unit for discharging flue gas, a flue gas waste heat utilization unit, a flue gas dust removal unit, and a flue gas desulfurization unit, wherein the flue gas waste heat utilization unit comprises a preheater, a primary flue gas heat exchanger arranged between the preheater and the flue gas dust removal unit, and a secondary flue gas heat exchanger arranged at the inlet of the flue gas desulfurization unit. The primary and the secondary flue gas heat exchangers both adopt flue gas-air heat exchangers; or the primary flue gas heat exchanger adopts a flue gas-water heat exchanger with the water source on the side of condensation water serving as condensation water in a condensate circuit of a steam turbine, and the secondary flue gas heat exchanger adopts a flue gas-air heat exchanger; or the primary flue gas heat exchanger adopts a flue gas-air heat exchanger, and the secondary flue gas heat exchanger adopts a flue gas-water heat exchanger with the water source on the side of condensation water serving as condensation water in the condensate circuit of the steam turbine.
Description
Technical field
The utility model relates to a kind of environment protection energy-saving equipment, relates more specifically to a kind of reduction soot emissions that are applied to the thermal power plant, improves desulfuration efficiency, the fume afterheat of the smoke comprehensive optimization of conserve water consumption utilizes system.
Background technology
Along with development and national economy, society constantly improves the demand of electric power.For the new developing country that carries out industrialization and rapid economic development, as China, the consumption of electric power and the installed capacity in power plant increase sharply.For China, owing to be subjected to the maintenance variety of its primary energy and store quantitative limitation, the fuel in power plant has reached more than 70% based on coal in recent decades, and this trend does not in a foreseeable future have basic change.Though coal fired thermal power plant has advantages such as cost is lower, fuel source is extensive for China, there are shortcomings such as efficient is lower, pollutant emission is more in coal fired thermal power plant.Because be discharged into the burning that pollutant in the atmosphere derives from coal basically, so the coal consumption amount positive correlation of the discharge capacity of pollutant and thermal power plant, the while is also relevant with the gas cleaning efficient of flue gas purifying equipment.Therefore, system is optimized at coal steam-electric plant smoke, improves the purification efficiency of flue gas purifying equipment when reducing thermal power plant's coal consumption amount, and reducing thermal power plant's discharging of pollutant in atmosphere in the time of with the realization energy savings is a promising technology.
Generally speaking, can adopt following three kinds of methods to reduce the coal consumption amount of thermal power plant.(1) pressure and temperature of raising steam.After having improved the pressure and temperature of steam, Efficiency of Steam Turbine will improve, and hear rate descends, and can improve the efficient of whole thermal power generation system, reduce coal consumption.At present, the steam pressure of the fired power generating unit of main flow and temperature are brought up to supercritical parameter from subcritical parameter, further bring up to super parameter.Do unremitting technical research both at home and abroad at present for further improving vapor (steam) temperature.But step of the every raising of vapor (steam) temperature and pressure, boiler and steam turbine all need to adopt calorific intensity and the higher material of resistance to corrosion, have improved the construction maintenance cost of unit greatly.(2) the steam discharge parameter of reduction steam turbine.After having reduced the steam discharge parameter of steam turbine, also can improve Efficiency of Steam Turbine, reduce the hear rate of steam turbine.The steam discharge parameter that reduces steam turbine promptly needs to reduce the recirculated cooling water temperature of steam turbine, owing to be subjected to the restriction of power plant geographical position of living in and weather conditions, the recirculated cooling water temperature is to change in certain scope, so the steam discharge parameter decline scope of steam turbine is limited.For areal, the steam discharge parameter of steam turbine is certain.(3) the discharging heat loss of minimizing boiler smoke.The flue gas that produces after the boiler combustion, different according to boiler form and coal-fired kind, its temperature is generally between 110 ℃～170 ℃.Generally boiler smoke directly is discharged into atmosphere after by purified treatment, and the discharged flue gas temperature does not almost change, and promptly the heat in the flue gas directly is discharged into atmosphere and is not used.In adopting the technology of smoke-gas wet desulfurization, flue gas in desulfuration absorbing tower under the spray effect of desulfurizer slurry temperature drop to 40 ℃～50 ℃, the heat of flue gas is taken away by slurries in this process, has evaporated the moisture in the slurries.Flue-gas temperature is high more, and is big more to the evaporation capacity of moisture content in the slurries, and the water consumption of power plant is big more.Some power plant are owing to be subjected to environmental protection requirement, requirement discharged flue gas temperature in atmosphere is not less than 72 ℃～80 ℃, the flue gas of desulfuration absorbing tower outlet need be heated to this more than temperature, therefore adopted flue gas-flue gas heat exchange device or gas-water-flue gas heat exchange device flue gas with the lower temperature of the flue gas heating desulfuration absorbing tower discharge of the higher temperature of boiler discharge, because the flue gas after the heating still is discharged in the atmosphere, the heat of the flue gas of boiler emission still is not recovered utilization.
This shows, be the effective way that reduces the coal consumption amount of thermal power plant for the utilization of residual heat from boiler fume.To the utilization of residual heat from boiler fume, have many design and practices both at home and abroad, all adopt the pattern of flue gas heat exchange device, by heat exchanger the heat in the flue gas is replaced to other medium to be used.This flue gas heat exchange device is called as various titles such as " low-level (stack-gas) economizer ", " low-pressure coal saver ", " gas cooler ", " cigarette water-to-water heat exchanger ", its essence is same or analogous.
Particularly, the flue gas heat exchange device of prior art is arranged as follows:
(1) the flue gas heat exchange device is arranged in boiler tail, adopts condensate water to absorb fume afterheat.For example, domestic certain boiler of power plant exhaust gas temperature is higher, in order to reduce exhaust gas temperature, improves the performance driving economy of unit, has installed low-level (stack-gas) economizer additional in the outlet of boiler tail air preheater, adopts condensate water to absorb fume afterheat, sees accompanying drawing 1.When the former Soviet Union reequips the boiler unit in order to reduce flue gas loss,, adopt hot net water to absorb fume afterheat at the bottom installing low-level (stack-gas) economizer of boiler to flow through shaft.
(2) the flue gas heat exchange device is arranged in before the desulfuration absorbing tower, adopts condensate water to absorb fume afterheat.The Germany Schwarze Pumpe 2 * 800MW of power plant brown coal generating set has installed gas cooler additional between electrostatic precipitator and fume desulfurizing tower, adopt condensate water to absorb fume afterheat, sees accompanying drawing 2.
In sum, existing these flue gas heat exchange device schemes have all adopted one-level cigarette water-to-water heat exchanger or flue gas-air heat exchanger, and the recovery fume afterheat that it mainly acts on reduce the generating set coal consumption amount, so function ratio is more single.
Those skilled in the art is devoted to obtain a kind of modifying device of above-mentioned flue gas heat exchange device layout, and it has the soot emissions of reduction, reduces sulfur dioxide (SO2) emissions, saves the desulphurization plant water, prevents the air preheater cold end corrosion, reduces multinomial functions such as blower fan power consumption and the coal consumption of saving unit.
In sum, the fume afterheat that this area is needed a kind of improved thermal power plant badly utilizes system, it its have the soot emissions of reduction, reduce sulfur dioxide (SO2) emissions, save the desulphurization plant water, prevent the air preheater cold end corrosion, reduce the blower fan power consumption and save multinomial functions such as unit coal consumption.
The utility model content
The purpose of this utility model is that the fume afterheat that obtains a kind of improved thermal power plant utilizes system, it its have the soot emissions of reduction, reduce sulfur dioxide (SO2) emissions, save the desulphurization plant water, prevent the air preheater cold end corrosion, reduce the blower fan power consumption and save multinomial functions such as unit coal consumption.
The utility model provides a kind of two-stage flue gas-air heat exchanger system that is applied to the thermal power plant, comprises that the boiler unit, the fume afterheat that discharge flue gas utilize unit, flue gas ash removal unit and flue gas desulfurization unit, and described fume afterheat utilizes the unit to comprise:
-preheater; And
The flue gas ash removal unit
-be arranged on the first order flue gas heat exchange device between described preheater and the flue gas ash removal unit, and the second level flue gas heat exchange device that is arranged on described flue gas desulfurization unit inlet;
Wherein,
Described first order flue gas heat exchange device and second level flue gas heat exchange device are the flue gas-air heat exchanger of the air side of the fume side that is provided with heat release and heat absorption;
Perhaps, described first order flue gas heat exchange device is the gas-water heat exchanger that is provided with the condensate water side of the fume side of heat release and heat absorption, and the water source of described condensate water side is the condensate water in the steam turbine condensate system, and described second level flue gas heat exchange device is the flue gas-air heat exchanger that is provided with the air side of the fume side of heat release and heat absorption;
Perhaps, described first order flue gas heat exchange device is the flue gas-air heat exchanger that is provided with the air side of the fume side of heat release and heat absorption, described second level flue gas heat exchange device is the gas-water heat exchanger that is provided with the condensate water side of the fume side of heat release and heat absorption, and the water source of described condensate water side is the condensate water in the steam turbine condensate system.
In a specific embodiment of the present utility model, when first order flue gas heat exchange device and second level flue gas heat exchange device are flue gas-air heat exchanger,
In the first order flue gas heat exchange device, the flue gas of fume side source is the boiler smoke of air preheater outlet, and the air source of air side is the cold wind of second level flue gas-air heat exchanger outlet;
In the flue gas heat exchange device of the second level, the flue gas of fume side source is the flue gas of air-introduced machine or optional booster fan outlet, and the air source of air side is the cold secondary wind of pressure fan outlet, or the air of air side source is the cold wind that primary air fan exports.
In a specific embodiment of the present utility model, described first order flue gas heat exchange device (31) is the gas-water heat exchanger, when described second level flue gas heat exchange device is flue gas-air heat exchanger,
In the first order flue gas heat exchange device, the flue gas source of fume side is the boiler smoke of preheater outlet, preferably, the condensate water of described condensate water side derives from certain one-level low-pressure heater outlet or some grades of low-pressure heater outlets and gathers, and gets back to the outlet of certain one-level low-pressure heater after condensate water is absorbed heat by first order gas-water heat exchanger;
Preferably, described condensate water also adopts domestic water or its combination that turbine system condensate water, hot net water, heating ventilation air-conditioning system water, power plant and other unit of adjacent machine need;
In the flue gas heat exchange device of the second level, the flue gas of fume side source is the flue gas of air-introduced machine or optional booster fan outlet, and the air source of air side is the cold secondary wind of pressure fan outlet, and perhaps, the air of air side source is the cold wind that primary air fan exports.
In a specific embodiment of the present utility model, described first order flue gas heat exchange device is a flue gas-air heat exchanger, when described second level flue gas heat exchange device is the gas-water heat exchanger,
In the first order flue gas heat exchange device, the flue gas of fume side source is the boiler smoke of preheater outlet, and the air source of air side is the cold secondary wind of pressure fan outlet, and perhaps, the air of air side source is a cold wind of primary air fan outlet;
In the flue gas heat exchange device of the second level, the flue gas source of fume side is the flue gas of air-introduced machine or optional booster fan outlet, preferably, the condensate water of described condensate water side derives from certain one-level low-pressure heater outlet or some grades of low-pressure heater outlets and gathers, and gets back to the outlet of certain one-level low-pressure heater after condensate water is absorbed heat by first order gas-water heat exchanger;
Preferably, described condensate water also adopts domestic water or its combination that turbine system condensate water, hot net water, heating ventilation air-conditioning system water, power plant and other unit of adjacent machine need.
In a specific embodiment of the present utility model, the fume side of described first order flue gas heat exchange device and second level flue gas heat exchange device is that serial arrangement is connected.
In a specific embodiment of the present utility model, described first order flue gas heat exchange device or second level flue gas heat exchange device adopt surface-type heat exchanger or heat-pipe heat exchanger.
In a specific embodiment of the present utility model, described first order flue gas heat exchange device or second level flue gas heat exchange device adopt the indirect-heating heat exchanger that intermediate carrier is arranged.
In a specific embodiment of the present utility model, described each grade heat exchanger is a heat exchanger, perhaps is the combination of several heat exchangers of parallel connection.
Two-stage flue gas-air heat exchanger of the present utility model system carries out flue gas waste heat recovery and can reduce smoke dust discharge concentration, water consumption and air-introduced machine, booster fan power consumption, and it adopts and comprises the steps to move:
The flue gas that the boiler unit is produced utilizes preheater in the unit by fume afterheat, obtains 110 ℃～170 ℃ preheating flue gas;
Described preheating flue gas carries out waste heat recovery at first order flue gas heat exchange device, make its temperature drop to above 5～10 ℃ of flue gas acid dew point temperature, obtain the flue gas of one-level through waste heat recovery, reduced flue gas simultaneously and improved efficiency of dust collection realization reduction smoke dust discharge concentration, reduced flue gas simultaneously and submit to flow to realize reducing air-introduced machine, booster fan power consumption than resistance;
Described one-level temperature after the flue gas of waste heat recovery is by second level flue gas heat exchange device is reduced to 80～90 ℃ of flue-gas temperatures, obtains the flue gas of the second level through waste heat recovery, reduces desulphurization system water consumption simultaneously;
The described second level enters the flue gas desulfurization unit through the flue gas of waste heat recovery.
Technical conceive of the present utility model is to improve at the concrete defective in this area, and utility model people finds, improves to obtain tangible technological progress at following various aspects:
(1) flue gas that produces of boiler combustion need be discharged to atmosphere with flue gas by the resistance that blower fan overcomes flue gas system, and general thermal power plant adopts air-introduced machine or air-introduced machine and desulfurization booster fan to discharge flue gas.Because the flue gas volume flow is huge, so air-introduced machine and booster fan power consumption are huge, are the current consuming apparatus of both thermal power plant's maximums, have reached about 30% of full factory power consumption.The volume flow of flue gas is relevant with flue-gas temperature, and flue-gas temperature is low, and then flow is low,
Therefore, by lasting and deep research, utility model people finds, as reducing the flue-gas temperature of air-introduced machine, booster fan import, can reduce compressor flow, reduce the power consumption of blower fan, on other condition basis of invariable, the power consumption of blower fan is directly proportional with flue-gas temperature basically.Simultaneously lower flue-gas temperature can be selected the less draught fan impeller of diameter, reduces the cost of investment of blower fan.
(2) effect of electrostatic precipitator (also being the flue gas ash removal unit) is to catch flue dust in the flue gas by battery lead plate, enters the fume amount of atmosphere with reduction.The flue dust capturing efficiency of deduster is relevant with the ratio resistance of flue gas, and lower more than resistance, under the identical situation of other condition, the efficient of deduster is high more.Flue-gas temperature can reduce the ratio resistance of flue gas after by first order flue gas heat exchange device desuperheat, thereby improves the efficient of deduster.
(3) when flue-gas temperature when acid dew point is following, the acid ion in the flue gas as sulfur-containing anion etc., can produce corrosivity, and the equipment in the flue gas system such as electrostatic precipitator, blower fan, flue, desulphurization plant etc. are produced corrosion.Because the etching characteristic of flue gas, existing fume afterheat utilizes and exists following deficiency in the system, or the amplitude that flue-gas temperature reduces is little, it is maintained more than the acid dew-point temperature, then fume afterheat underutilization; Maybe the flue gas heat exchange device can only be arranged in the most equipment downstream in the flue gas system, as be arranged in before the desulfuration absorbing tower, then the equipment of flue gas heat exchange device upstream such as deduster, air-introduced machine, booster fan etc. still are in the higher flue gas environment, can't realize benefits such as efficiency of dust collection raising that low flue-gas temperature brings, the reduction of blower fan power consumption; Or upstream and the flue-gas temperature that the flue gas heat exchange device is arranged in flue gas system equipment be reduced to below the acid dew point, cause these equipment to receive acid corrosion, reduced service life.In addition, existing flue gas heat exchange device adopts condensate water to absorb flue gas heat, because squeezed behind the turbine low pressure cylinder drawing gas of what after condensate water heats up, the heat major part of being squeezed of drawing gas is taken away by condenser, have only the small part heat to be used in the steam turbine acting.The heat utilization efficiency that therefore existing employing condensate water absorbs flue gas heat flue gas heat exchange device is lower, is generally 10%～20%.
The utility model utilizes the deficiency of system at above-mentioned existing fume afterheat, adopt two-stage flue gas-air heat exchanger system, with the heat that enters the absorption of air flue gas that boiler is used to burn, improved the heat utilization efficiency of flue gas heat exchange device greatly, generally can reach 40-60%.。First order flue gas-air heat exchanger is arranged between air preheater and the flue gas ash removal unit, and the temperature of flue gas after by first order flue gas heat exchange device is reduced to more than the acid dew-point temperature 5 ℃～10 ℃.Second level flue gas heat exchange device is arranged in before the desulfuration absorbing tower, the temperature of flue gas after by second level flue gas heat exchange device is reduced to more than the water dew point temperature 20 ℃～25 ℃ or according to the mixed economy technology of the income of the power plant coal consumption of the arrangement space that takies of the manufacturing cost of flue gas heat exchange device, flue gas heat exchange device and saving relatively, select the flue-gas temperature of an optimum, as 85 ℃.Adopted the two-stage fume afterheat to utilize the unit, the waste heat that can reclaim flue gas to greatest extent is to reduce the coal consumption of thermal power plant, can prevent flue gas corrosion equipment again, raising deduster efficiency of dust collection, reduction air-introduced machine and booster fan power consumption, reduction air-introduced machine and booster fan cost of investment, the reduction denitrating tower water that can also utilize lower flue-gas temperature to bring consume, reduce the interior flue gas flow rate of desulfurizing tower with comprehensive benefits such as raising desulfuration efficiencies, can also prevent the corrosion of air preheater low-temperature zone heating surface, prolong the life-span of heating surface.Generally speaking, flue gas-air heat exchanger is big than gas-water heat exchanger floor space, the equipment cost height, as arranged, the restriction of factor such as cost of investment, also can select certain one-level in the two-stage heat exchanger to adopt flue gas-air heat exchanger, another level adopts the gas-water heat exchanger.
Description of drawings
Fig. 1 is the layout of the flue gas heat exchange device of prior art, and it is arranged in boiler tail, adopts condensate water to absorb fume afterheat;
Fig. 2 is the layout of the flue gas heat exchange device of prior art, and it is arranged in before the desulfuration absorbing tower, adopts condensate water to absorb fume afterheat;
Fig. 3 is an optional embodiment of two-stage flue gas-air heat exchanger of the present utility model system;
Fig. 4 is an optional embodiment of two-stage flue gas-air heat exchanger of the present utility model system;
Fig. 5 is an optional embodiment of two-stage flue gas-air heat exchanger of the present utility model system;
Fig. 6 is an optional embodiment of two-stage flue gas-air heat exchanger of the present utility model system;
Fig. 7 is an optional embodiment of two-stage flue gas-air heat exchanger of the present utility model system;
Fig. 8 is an optional embodiment of two-stage flue gas-air heat exchanger of the present utility model system.
The specific embodiment
The utility model people by improving technology, has obtained a kind of two-stage boiler smoke-air heat exchanger and system thereof through extensive and deep research, adopts the air and the boiler smoke that enter boiler furnace to carry out heat exchange.After adopting this system, can reduce fired power generating unit coal consumption amount, avoid air preheater low-temperature zone heated surface corrosion, improve the heating surface life-span, improve flue gas purifying equipment---the efficient of electrostatic precipitator, reduce the discharge capacity of flue dust, the air-introduced machine of reduction flue gas system and power consumption, the minimizing flue gas purifying equipment of booster fan---the water consumption of fume desulfurizing tower and the efficient of raising fume desulfurizing tower, reduce the discharge capacity of sulfur dioxide.Finished the utility model on this basis.
Herein, described " boiler unit " mainly comprises boiler plant.Described boiler plant is not specifically limited, and only otherwise utility model purpose of the present utility model is produced restriction to get final product, is well known by persons skilled in the art.Can adopt π type boiler, tower boiler etc., all in protection domain of the present utility model.
Herein, described " preheater " is not specifically limited, and only otherwise utility model purpose of the present utility model is produced restriction to get final product, is well known by persons skilled in the art.Can adopt tubular preheater, rotary preheater etc., all in protection domain of the present utility model.
Herein, described " flue gas ash removal unit " is meant the equipment of catching dust in the flue gas.The preferred design of adopting the control flow velocity and optimizing the flue gas flow field distribution.Only otherwise utility model purpose of the present utility model is produced restriction to get final product, be well known by persons skilled in the art.Can adopt electrostatic precipitator, cloth bag flue gas ash removal unit, electricity bag flue gas ash removal unit, moisture film flue gas ash removal unit etc., all in protection domain of the present utility model.
Herein, described each grade flue gas heat exchange device is a heat exchanger, perhaps is several heat exchangers in parallel.
Herein, described air-introduced machine is not specifically limited, and only otherwise utility model purpose of the present utility model is produced restriction to get final product, is well known by persons skilled in the art.Can adopt centrifugal type draught fan, axle induced-draft fan etc., all in protection domain of the present utility model.
Herein, described desulfurization booster fan is not specifically limited, and only otherwise utility model purpose of the present utility model is produced restriction to get final product, is well known by persons skilled in the art.
Herein, flue gas-condensate water heat exchanger comprises pipe heat exchanger, plate type heat exchanger, surface-type heat exchanger, indirect-heating heat exchanger etc., all in protection domain of the present utility model.
Herein, flue gas-air heat exchanger comprises flue gas, air direct heat exchanger or the indirect-heating heat exchanger of middle heating agent is arranged.Be preferably pipe heat exchanger or rotary type heat exchanger.Preferably adopt liquid heating agent.Described liquid heating agent comprises water or other lower boiling liquid, preferred ethylene glycol.Described heating agent is kept it by heat medium circulation pump and is flowed between fume side/air side and heating agent side heat exchanger.Liquid heating agent preferably is provided with the gas-liquid separation equipment that condenses when adopting lower boiling liquid on closed circuit, circulating pump is arranged on the downstream of this equipment.
Herein, boiler furnace import cold wind comprises the cold secondary wind of pressure fan outlet; The perhaps cold wind of primary air fan outlet.Described pressure fan, primary air fan are well known by persons skilled in the art.
Herein, the turbine system condensate water of described adjacent machine, hot net water, heating ventilation air-conditioning system water, power plant and other domestic water are not specifically limited, only otherwise utility model purpose of the present utility model is produced restriction to get final product, be well known by persons skilled in the art.
Herein, steamer turbine condensate system can be the part of Steam Turbine Regenerative System, but is not limited to this.Steamer turbine condensate system of the present utility model overcomes the flue gas heat exchange device by the condensate pump in the steam turbine condensate system and imports and exports the condensate water resistance of condensing water conduit, perhaps, overcome the condensate water resistance of flue gas heat exchange device and import and export condensing water conduit thereof by condensate booster pump.The scope of boosting of needed booster is well known by persons skilled in the art.Wherein can comprise low-pressure heater at different levels.The implication of described low-pressure heater is known for those skilled in the art.
Below various aspects of the present utility model are described in detail, if specifically do not indicate, term of the present utility model is known for those skilled in the art.Concrete example is as can be referring to described in " Thermal Power Station " or " Principles of Boiler " of China Electric Power Publishing House.
Be applied to the two-stage flue gas-air heat exchanger system in thermal power plant
The utility model provides a kind of two-stage flue gas-air heat exchanger system that is applied to the thermal power plant, comprise that the boiler unit (100), the fume afterheat that discharge flue gas utilize unit (200), electrostatic precipitation unit (300) and flue gas desulfurization unit (400), described fume afterheat utilizes unit (200) to comprise:
-preheater (2); And
-flue gas ash removal unit (300);
-be arranged on the first order flue gas heat exchange device (31) between described preheater (2) and flue gas ash removal unit (300), and the second level flue gas heat exchange device (32) that is arranged on described flue gas desulfurization unit (400) import;
Wherein,
Described first order flue gas heat exchange device (31) and second level flue gas heat exchange device (32) are the flue gas-air heat exchanger of the air side of the fume side that is provided with heat release and heat absorption;
Perhaps, described first order flue gas heat exchange device (31) is the gas-water heat exchanger of the condensate water side that is provided with the fume side of heat release and heat absorption, and the water source of described condensate water side is the condensate water in the steam turbine condensate system, and described second level flue gas heat exchange device (32) is the flue gas-air heat exchanger of the air side that is provided with the fume side of heat release and heat absorption
Perhaps, described first order flue gas heat exchange device (31) is the flue gas-air heat exchanger of the air side that is provided with the fume side of heat release and heat absorption, described second level flue gas heat exchange device (32) is the gas-water heat exchanger of the condensate water side that is provided with the fume side of heat release and heat absorption, and the water source of described condensate water side is the condensate water in the steam turbine condensate system.
In a preference, the downstream of described flue gas ash removal unit (300) is provided with air-introduced machine (5) and optional desulfurization booster fan (6), enters follow-up second level flue gas heat exchange device (32) after making flue gas by described air-introduced machine (5) and desulfurization booster fan (6) adherence pressure.
In a preference, the water side water source of described gas-water heat exchanger also comprises turbine system condensate water, hot net water, heating ventilation air-conditioning system water, power plant and other domestic water of adjacent machine.
In a preference, described condensate water derives from certain one-level low-pressure heater outlet of steam turbine condensate system or gathering of some grades of low-pressure heater outlets.
Particularly, condensate water is got back to certain one-level low-pressure heater import or export after absorbing heat by the flue gas heat exchange device.
In a preference, described steam turbine condensate system also is provided with condensate booster pump.
In a preference, flue gas heat exchange device and certain one-level or some grades of low-pressure heaters are polyphone or in parallel or promptly have polyphone that the relation of parallel connection is arranged again on the condensate water flow process.
In one embodiment, first order flue gas heat exchange device (31) and second level flue gas heat exchange device (32) be when being flue gas-air heat exchanger,
In the first order flue gas heat exchange device (31), the flue gas of fume side source is the boiler smoke of air preheater outlet, and the air source of air side is the cold wind of second level flue gas-air heat exchanger outlet;
In the second level flue gas heat exchange device (32), the flue gas of fume side source is the flue gas of air-introduced machine or optional booster fan outlet, and the air source of air side is the cold secondary wind of pressure fan outlet, or the air of air side source is the cold wind that primary air fan exports.
Particularly, described two-stage flue gas-air heat exchanger is contacted on the flow process of fume side, also connects on the air side flow process.And the flow direction of flue gas and air is an adverse current.
In one embodiment, described first order flue gas heat exchange device (31) is the gas-water heat exchanger, when described second level flue gas heat exchange device (32) is flue gas-air heat exchanger,
In the first order flue gas heat exchange device (31), the flue gas source of fume side is the boiler smoke of preheater (2) outlet, the water source can adopt the condensate water in the steam turbine condensate system, promptly derive from outlet of certain one-level low-pressure heater or some grades of low-pressure heater outlets and gather, condensate water is got back to the outlet of certain one-level low-pressure heater after by the heat absorption of first order gas-water heat exchanger; Also can adopt the water source of other types, the domestic water that needs as the turbine system condensate water of adjacent machine, hot net water, heating ventilation air-conditioning system water, power plant and other unit etc.；
In the second level flue gas heat exchange device (32), the flue gas source of fume side is the flue gas of air-introduced machine or optional booster fan outlet, the air source of air side is the cold secondary wind of pressure fan outlet, and perhaps, the air of air side source is a cold wind of primary air fan outlet.
In one embodiment, described first order flue gas heat exchange device (31) is a flue gas-air heat exchanger, when described second level flue gas heat exchange device (32) is the gas-water heat exchanger,
In the first order flue gas heat exchange device (31), the flue gas of fume side source is the boiler smoke of preheater (2) outlet, and the air source of air side is the cold secondary wind of pressure fan outlet, and perhaps, the air of air side source is a cold wind of primary air fan outlet;
In the second level flue gas heat exchange device (32), the flue gas source of fume side is the flue gas of air-introduced machine or optional booster fan outlet, the water source can adopt the condensate water in the steam turbine condensate system, promptly derive from outlet of certain one-level low-pressure heater or some grades of low-pressure heater outlets and gather, condensate water is got back to the outlet of certain one-level low-pressure heater after by the heat absorption of first order gas-water heat exchanger; Also can adopt the water source of other types, the domestic water that needs as the turbine system condensate water of adjacent machine, hot net water, heating ventilation air-conditioning system water, power plant and other unit etc.
In one embodiment, the fume side when described first order flue gas heat exchange device (31) and second level flue gas heat exchange device (32) is that serial arrangement is connected.
In one embodiment, described first order flue gas heat exchange device (31) or second level flue gas heat exchange device (32) adopt surface-type heat exchanger or heat-pipe heat exchanger.
In one embodiment, described first order flue gas heat exchange device (31) or second level flue gas heat exchange device (32) adopt the indirect-heating heat exchanger that intermediate carrier is arranged.
In a preference, the heating agent of described intermediate carrier is liquid.Described liquid heating agent is selected from water or other lower boiling liquid, preferred ethylene glycol.
The using method that two-stage flue gas-air heat exchanger system carries out flue gas waste heat recovery
Two-stage flue gas-air heat exchanger of the present utility model system carries out flue gas waste heat recovery, and this method can reduce smoke dust discharge concentration, water consumption and air-introduced machine, booster fan power consumption, and it comprises the steps:
The flue gas that boiler unit (100) are produced utilizes preheater (2) in the unit (200) by fume afterheat, obtains 110 ℃～170 ℃ preheating flue gas;
Described preheating flue gas carries out waste heat recovery at first order flue gas heat exchange device (31), make its temperature drop to above 5～10 ℃ of flue gas acid dew point temperature, obtain the flue gas of one-level through waste heat recovery, reduced flue gas simultaneously and improved efficiency of dust collection realization reduction smoke dust discharge concentration, reduced flue gas simultaneously and submit to flow to realize reducing air-introduced machine, booster fan power consumption than resistance;
Described one-level temperature after the flue gas of waste heat recovery is by second level flue gas heat exchange device (32) is reduced to 80～90 ℃ of flue-gas temperatures, obtains the flue gas of the second level through waste heat recovery, reduces desulphurization system water consumption simultaneously;
The described second level enters flue gas desulfurization unit (400) through the flue gas of waste heat recovery.
Preferably, described one-level enters flue gas ash removal unit (300) through the flue gas of waste heat recovery, and through entering second level flue gas heat exchange device (32) after air-introduced machine (5) and optional desulfurization booster fan (6) the lifting flue gas pressures.
The utlity model has following advantage.
(1) the utility model can be saved the fuel consumption of generating set.The flue gas heat that the utility model is discharged boiler by flue gas-air heat exchanger is converted to the air heat that enters boiler, directly reduces the fuel consumption of boiler.Or utilize the gas-water heat exchanger that the flue gas heat of boiler discharge is transformed in the Steam Turbine Regenerative System, and squeeze drawing gas in the part low-pressure heater, can increase the generated energy of steam turbine generator, the fuel consumption of indirect saving unit.
(2) the utility model can be avoided air preheater cold junction heated surface corrosion, has prolonged the service life of cold junction heating surface.The metal temperature of cold junction heating surface is a little more than acid dew-point temperature during the air preheater design, and therefore when the boiler at low load exhaust gas temperature reduced or winter, the cold wind temperature reduced, the metal temperature of cold junction heating surface also descended thereupon, causes the cold junction heated surface corrosion easily.The utility model has improved the cold wind temperature that enters air preheater, has also improved the metal temperature of cold junction heating surface, can avoid the cold junction heated surface corrosion, has prolonged the service life of cold junction heating surface.
(3) the utility model can improve the efficiency of dust collection of flue gas ash removal unit, reduces the discharging of flue dust.Flue gas descends the also corresponding decline of ratio resistance of flue gas by first order flue gas-air heat exchanger (or gas-water heat exchanger) back temperature.For deduster, its efficiency of dust collection rises along with flue gas has comparatively significantly than the decline of resistance.Therefore, the efficiency of dust collection that first order flue gas-air heat exchanger (or gas-water heat exchanger) can improve the flue gas ash removal unit is set, reduces the discharging of flue dust in the flue gas ash removal unit inlet.
(4) the utility model can reduce the air-introduced machine that is arranged on downstream, flue gas ash removal unit and the power consumption of booster fan, can save the station service of generating set.Flue gas descends by first order flue gas-air heat exchanger (or gas-water heat exchanger) back temperature, and the volume flow of flue gas descends, and can reduce the air-introduced machine that is arranged on downstream, flue gas ash removal unit, the power consumption of booster fan, saves the station service of unit.
(5) the utility model can reduce the water consumption of desulphurization system.Temperature descended after flue gas passed through first order heat exchanger and second level heat exchanger, and the flue-gas temperature that causes entering desulfuration absorbing tower reduces.For the technology of smoke-gas wet desulfurization, need with flue gas in desulfuration absorbing tower under the spray effect of desulfurizer slurry temperature drop to 40 ℃～50 ℃, the moisture in the slurries has been evaporated in the heat release of flue gas in this process.Flue-gas temperature is high more, and is big more to the evaporation capacity of moisture content in the slurries, and the water consumption of desulphurization system is big more.Therefore, be provided with the first order and second level heat exchanger after, reduce the flue-gas temperature enter desulfuration absorbing tower, can reduce the evaporation of water amount of desulfuration absorbing tower, reduce the water consumption of desulphurization system greatly.
(6) the utility model can improve the desulfuration efficiency of desulfuration absorbing tower, reduces the discharging of sulfur dioxide.Temperature descended after flue gas passed through first order flue gas heat exchange device and second level flue gas heat exchange device, caused the volume flow of flue gas to descend.After flue gas enters desulfuration absorbing tower, the flow velocity of flue gas descends, and the time of staying of flue gas in desulfurizing tower spray zone increases, and promptly increased the time of contact of sulfur in smoke and desulfurization slurry, can improve the desulfuration efficiency of desulfuration absorbing tower, reduce the discharging of sulfur dioxide.
Specify as nothing, various device of the present utility model all can obtain by commercially available.
Other aspects of the present utility model are because the disclosure of this paper is conspicuous to those skilled in the art.
Below in conjunction with specific embodiment, further set forth the utility model.Should be understood that these embodiment only to be used to the utility model is described and be not used in the restriction scope of the present utility model.The experimental technique of unreceipted actual conditions in the following example usually according to normal condition, or carries out according to the condition that manufacturer advises.Unless otherwise indicated, otherwise all umbers are weight portion, and all percentages are weight percentage, and described polymer molecular weight is a number-average molecular weight.
Unless otherwise defined or explanation, the meaning that all specialties used herein are familiar with scientific words and those skilled in the art is identical.Any in addition method similar or impartial to described content and material all can be applicable in the utility model method.
Embodiment
Typical schematic diagram of the present utility model is seen accompanying drawing 3～accompanying drawing 8.
Two-stage flue gas-air heat exchanger system is made up of following major part:
(1) boiler 100
(2) air preheater 2
(3) primary air fan 3
(4) pressure fan 4
(5) first order flue gas-air heat exchanger (or gas-water heat exchanger) 31
(6) the flue gas ash removal unit 300
(7) air-introduced machine 5
(8) booster fan 6
(9) second level flue gas-air heat exchanger (or gas-water heat exchanger) 32
(10) desulfuration absorbing tower 400
(11) low-pressure heater 7 (being called for short " low adding ")
(12) booster 8
(13) circulating pump 9
The utility model can be realized by following several schemes, be respectively described below:
Embodiment 1 (correspondence principle figure accompanying drawing 3, accompanying drawing 4, Fig. 3 are the direct-type heat exchanger, and Fig. 4 is the indirect type heat exchanger)
The flue gas that boiler 100 burning produces is by behind the air preheater 2, different according to boiler form and coal-fired kind, and its temperature is generally between 110 ℃～170 ℃.Flue gas drops to more than the flue gas acid dew point temperature about 10 ℃ by first order flue gas-air heat exchanger 31 back temperature.First order flue gas-air heat exchanger 31 adopts the temperature of the absorption of air flue gas that enters boiler.Flue gas derives from the boiler smoke of air preheater outlet, and air derives from the cold wind of second level flue gas-air heat exchanger 32 outlets.Flue gas enters flue gas ash removal unit 300 by behind the first order flue gas-air heat exchanger 31, and through entering second level flue gas-air heat exchanger 32 after air-introduced machine 5 and the desulfurization booster fan 6 lifting flue gas pressures.In this programme, booster fan can omit, and adopts the higher air-introduced machine 5 of lift to finish the function that promotes flue gas pressures.Second level flue gas-air heat exchanger 32 adopts the temperature of the absorption of air flue gas that enters boiler.Flue gas derives from the flue gas of booster fan (or air-introduced machine 5) outlet, and air derives from the cold secondary wind of pressure fan outlet, also can adopt a cold wind of primary air fan outlet.The flue-gas temperature of second level flue gas-air heat exchanger outlet is generally 80～90 ℃.
The two-stage flue gas-air heat exchanger is contacted on flue gas flow in this scheme, also connects on the air flow process.For the two-stage flue gas-air heat exchanger, the flow direction of flue gas and air is an adverse current.
The form of heat exchanger can adopt flue gas, air direct heat exchanger, as pipe heat exchanger, rotary type heat exchanger, and the indirect-heating heat exchanger of heating agent in the middle of also can adopting.Heating agent absorbs heat in fume side, in the air side heat release.Heating agent is liquid, can be water, also can be other lower boiling liquid, and as ethylene glycol etc., heating agent is kept it by heat medium circulation pump and flowed between fume side/air side and heating agent side heat exchanger.As adopting lower boiling liquid that the gas-liquid separation equipment that condenses can be set on closed circuit, circulating pump is arranged on the downstream of this equipment.These schemes also belong to protection domain of the present utility model.
Embodiment 2 (correspondence principle figure accompanying drawing 5, accompanying drawing 6, Fig. 5 are the direct-type heat exchanger, and Fig. 6 is the indirect type heat exchanger)
The flue gas that boiler combustion produces is by behind the air preheater 2, different according to boiler form and coal-fired kind, and its temperature is generally between 110 ℃～170 ℃.Flue gas drops to more than the flue gas acid dew point temperature about 10 ℃ by first order gas-water heat exchanger 31 back temperature.Flue gas derives from the boiler smoke of air preheater 2 outlets, the water source can adopt the condensate water in the steam turbine condensate system, promptly derive from 7 outlets of certain one-level low-pressure heater or some grades of low-pressure heater outlets and gather, condensate water is got back to the outlet of certain one-level low-pressure heater after by 31 heat absorptions of first order gas-water heat exchanger; Also can adopt the water source of other types, the domestic water that needs as the turbine system condensate water of adjacent machine, hot net water, heating ventilation air-conditioning system water, power plant and other unit etc.Flue gas enters flue gas ash removal unit 300 by behind the first order gas-water gas heat exchanger 31, and through entering second level flue gas-air heat exchanger 32 after air-introduced machine 5 and the desulfurization booster fan 6 lifting flue gas pressures.In this programme, booster fan 6 can omit, and adopts the higher air-introduced machine 5 of lift to finish the function that promotes flue gas pressures.Second level flue gas-air heat exchanger 32 adopts the temperature of the absorption of air flue gas that enters boiler.Flue gas derives from the flue gas of booster fan (or air-introduced machine) outlet, and air derives from the cold secondary wind of pressure fan outlet, also can adopt a cold wind of primary air fan 3 outlets.The flue-gas temperature of second level flue gas-air heat exchanger outlet is generally 80～90 ℃.
The form of heat exchanger can adopt flue gas, air direct heat exchanger, as pipe heat exchanger, rotary type heat exchanger, and the indirect-heating heat exchanger of heating agent in the middle of also can adopting.Heating agent absorbs heat in fume side, in the air side heat release.Heating agent is liquid, can be water, also can be other lower boiling liquid, and as ethylene glycol etc., heating agent is kept it by heat medium circulation pump and flowed between fume side/air side and heating agent side heat exchanger.As adopting lower boiling liquid that the gas-liquid separation equipment that condenses can be set on closed circuit, circulating pump is arranged on the downstream of this equipment.These schemes also belong to protection domain of the present utility model.
The resistance of the water side of the gas-water heat exchanger of this scheme can be overcome by the condensate pump in the steam turbine condensate system, also water side boosting pump can be set in addition, and these schemes also belong to protection domain of the present utility model.
Embodiment 3 (correspondence principle figure accompanying drawing 7, accompanying drawing 8, Fig. 7 are the direct-type heat exchanger, and Fig. 8 is the indirect type heat exchanger)
The flue gas that boiler 100 burning produces is by behind the air preheater 2, different according to boiler form and coal-fired kind, and its temperature is generally between 110 ℃～170 ℃.Flue gas drops to more than the flue gas acid dew point temperature about 10 ℃ by first order flue gas-air heat exchanger 31 back temperature.First order flue gas-air heat exchanger 31 adopts the temperature of the absorption of air flue gas that enters boiler.Flue gas derives from the boiler smoke of air preheater outlet, and air derives from the cold secondary wind of pressure fan outlet, also can adopt a cold wind of primary air fan outlet.Flue gas enters flue gas ash removal unit 300 by behind the first order flue gas-air heat exchanger 31, and through entering second level gas-water heat exchanger after air-introduced machine 5 and the desulfurization booster fan 6 lifting flue gas pressures.In this programme, booster fan 6 can omit, and adopts the higher air-introduced machine 5 of lift to finish the function that promotes flue gas pressures.The flue gas of second level gas-water heat exchanger derives from the flue gas of booster fan (or air-introduced machine) outlet, the water source can adopt the condensate water in the steam turbine condensate system, promptly derive from 7 outlets of certain one-level low-pressure heater or some grades of low-pressure heater outlets and gather, condensate water is got back to the outlet of certain one-level low-pressure heater after by the heat absorption of second level gas-water heat exchanger; Also can adopt the water source of other types, the domestic water that needs as the turbine system condensate water of adjacent machine, hot net water, heating ventilation air-conditioning system water, power plant and other unit etc.The flue-gas temperature of second level flue gas-air heat exchanger outlet is generally 80～90 ℃.
The form of heat exchanger can adopt flue gas, air direct heat exchanger, as pipe heat exchanger, rotary type heat exchanger, and the indirect-heating heat exchanger of heating agent in the middle of also can adopting.Heating agent absorbs heat in fume side, in the air side heat release.Heating agent is liquid, can be water, also can be other lower boiling liquid, and as ethylene glycol etc., heating agent is kept it by heat medium circulation pump and flowed between fume side/air side and heating agent side heat exchanger.As adopting lower boiling liquid that the gas-liquid separation equipment that condenses can be set on closed circuit, circulating pump is arranged on the downstream of this equipment.These schemes also belong to protection domain of the present utility model.
The resistance of the water side of the gas-water heat exchanger of this scheme can be overcome by the condensate pump in the steam turbine condensate system, also water side boosting pump can be set in addition, and these schemes also belong to protection domain of the present utility model.
With certain 1000MW unit is example, and intrinsic exhaust gas temperature is 125 ℃.Employing scheme one is provided with two-stage flue gas-air heat exchanger system.The input gas temperature of first order flue gas-air heat exchanger is 140 ℃, and exit gas temperature is 110 ℃, and the exit gas temperature of second level flue gas-air heat exchanger is 90 ℃.Cold secondary wind by the outlet of flue gas-air heat exchanger heating pressure fan.Behind the two-stage flue gas-air heat exchanger, the cold secondary air temperature degree that enters air preheater has improved 68 ℃, and the hot secondary air temperature degree of air preheater outlet has improved 47 ℃.This two-stage flue gas-air heat exchanger system can cement out the heat of 35750KW from flue gas, and input boiler, reduce generating standard coal consumption 4.5g/Kw.h, by generating set annual utilization hours 5500 hours, annual every generating set can be saved about 24500 tons of standard coals.Simultaneously, be reduced to 90 ℃ by 125 ℃, can save the about 80t/h of desulphurization system water consumption, amount to annual 440000 tons of water owing to enter the temperature of desulfuration absorbing tower.The efficient of deduster can rise to 99.86% from 99.7%, the dust contained flue gas concentration of the flue gas ash removal unit outlet 16.7mg/Nm that descended
3, year reduction of discharging dust 136t.
With certain 1000MW unit is example, and intrinsic exhaust gas temperature is 125 ℃.Employing scheme two is provided with first order gas-water heat exchanger and second level flue gas-air heat exchanger system.The input gas temperature of first order gas-water heat exchanger is 135 ℃, and exit gas temperature is 110 ℃, and the exit gas temperature of second level flue gas-air heat exchanger is 85 ℃.Condensate water is by after passing through first order gas-water heat exchanger, and temperature is brought up to 96 ℃ from 83 ℃.The cold secondary wind of second level flue gas-air heat exchanger heating pressure fan outlet.Behind the flue gas-air heat exchanger of the second level, the cold secondary air temperature degree that enters air preheater has improved 34 ℃, and the hot secondary air temperature degree of air preheater outlet has improved 19 ℃.This two-stage flue gas-air heat exchanger system can cement out the heat of 19300KW from flue gas, and the generated energy of input boiler and increase steam turbine generator, equivalence reduces generating standard coal consumption 2.6g/Kw.h, by generating set annual utilization hours 5500 hours, annual every generating set can be saved about 14300 tons of standard coals.Simultaneously, be reduced to 85 ℃ by 125 ℃, can save the about 80t/h of desulfurizing tower water consumption, amount to annual 440000 tons of water owing to enter the temperature of desulfuration absorbing tower.The efficient of deduster can rise to 99.86% from 99.7%, the dust contained flue gas concentration of the flue gas ash removal unit outlet 16.7mg/Nm that descended
3, year reduction of discharging dust 136t.
Discuss
The utility model adopts the computational methods of boiler hot mechanics principle and boiler efficiency.When calculating boiler efficiency, boiler is regarded as the therrmodynamic system of a sealing.Total input heat of boiler equals the caloric value of all the total enthalpy refuelling that enters boiler material burnings, also equals total quantity of heat given up of boiler.The steam enthalpy that total quantity of heat given up of boiler always enters steam turbine can be used to generating, other material such as flue gas etc. with enthalpy can not be used for generating, be the heat of waste.Therefore, if total input heat of boiler is certain, the air heat that enters boiler is many more, then can reduce the fuel quantity that generating set needs.The heat that utilizes flue gas to take away with its input boiler, also can reduce the fuel quantity that generating set needs.For boiler, determined its exhaust gas temperature during boiler design, also determined the heat loss that flue gas is taken away.Therefore, this flue gas-air heat exchanger heats the air that enters boiler by the heat that utilizes boiler to discharge flue gas, has played the effect of " turning waste into wealth ", realizes the purpose of the fuel consumption of minimizing generating set.
Simultaneously, the utility model has also utilized steam turbine thermodynamic cycle basic principle.Condensate water cooling pan kiln gas in the steam turbine condensate system is also returned the steam turbine condensate system after the flue gas heating, because drawing gas in the part low-pressure heater squeezed in the rising of condensing water temperature, under the constant situation of steam turbine throttle flow, the acting of being squeezed of in steam turbine, expanding of drawing gas, therefore, the gas-water heat exchanger has increased the generated energy of steam turbine generator under the constant situation of generating set coal consumption amount, in like manner, under the constant situation of steam turbine generator generated energy, the fuel consumption that can save generating set.
From practice test (for example according to performance embodiment), flue gas two stage flue gas-air heat exchanger of the present utility model system be not simply adding of common two-stage flue gas-air heat exchanger system and, but reached unexpected consumption reduction effect by particular design at ad-hoc location.
Simultaneously, the utility model can be avoided air preheater cold junction heated surface corrosion, has prolonged the service life of cold junction heating surface; Improve the efficiency of dust collection of flue gas ash removal unit, reduce the discharging of flue dust; Reduce being arranged on the air-introduced machine in downstream, flue gas ash removal unit and the power consumption of booster fan, can save the station service of generating set; Reduce the water consumption of desulphurization system; Improve the desulfuration efficiency of desulfuration absorbing tower, reduce the discharging of sulfur dioxide.
The above only is preferred embodiment of the present utility model, be not in order to limit essence technology contents scope of the present utility model, essence technology contents of the present utility model is broadly to be defined in the claim scope of application, any technology entity or method that other people finish, if it is defined identical with the claim scope of application, also or a kind of change of equivalence, all will be regarded as being covered by among this claim scope.
All quote in this application as a reference at all documents that the utility model is mentioned, just quoted as a reference separately as each piece document.Should be understood that in addition after having read foregoing of the present utility model, those skilled in the art can make various changes or modifications the utility model, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Claims (8)
1. two-stage flue gas-air heat exchanger system that is applied to the thermal power plant, comprise that the boiler unit (100), the fume afterheat that discharge flue gas utilize unit (200), flue gas ash removal unit (300) and flue gas desulfurization unit (400), it is characterized in that described fume afterheat utilizes unit (200) to comprise:
-preheater (2);
-be arranged on the first order flue gas heat exchange device (31) between described preheater (2) and flue gas ash removal unit (300), and the second level flue gas heat exchange device (32) that is arranged on described flue gas desulfurization unit (400) import;
Wherein,
Described first order flue gas heat exchange device (31) and second level flue gas heat exchange device (32) are the flue gas-air heat exchanger of the air side of the fume side that is provided with heat release and heat absorption;
Perhaps, described first order flue gas heat exchange device (31) is the gas-water heat exchanger of the condensate water side that is provided with the fume side of heat release and heat absorption, and the water source of described condensate water side is the condensate water in the steam turbine condensate system, and described second level flue gas heat exchange device (32) is the flue gas-air heat exchanger of the air side that is provided with the fume side of heat release and heat absorption;
Perhaps, described first order flue gas heat exchange device (31) is the flue gas-air heat exchanger of the air side that is provided with the fume side of heat release and heat absorption, described second level flue gas heat exchange device (32) is the gas-water heat exchanger of the condensate water side that is provided with the fume side of heat release and heat absorption, and the water source of described condensate water side is the condensate water in the steam turbine condensate system.
2. flue gas-air heat exchanger as claimed in claim 1 system is characterized in that, first order flue gas heat exchange device (31) and second level flue gas heat exchange device (32) be when being flue gas-air heat exchanger,
In the first order flue gas heat exchange device (31), the flue gas of fume side source is the boiler smoke of air preheater outlet, and the air source of air side is the cold wind of second level flue gas-air heat exchanger outlet;
In the second level flue gas heat exchange device (32), the flue gas of fume side source is the flue gas of air-introduced machine or optional booster fan outlet, and the air source of air side is the cold secondary wind of pressure fan outlet, or the air of air side source is the cold wind that primary air fan exports.
3. flue gas-air heat exchanger as claimed in claim 1 system is characterized in that described first order flue gas heat exchange device (31) is the gas-water heat exchanger, when described second level flue gas heat exchange device (32) is flue gas-air heat exchanger,
In the first order flue gas heat exchange device (31), the flue gas source of fume side is the boiler smoke of preheater (2) outlet, preferably, the condensate water of described condensate water side derives from certain one-level low-pressure heater outlet or some grades of low-pressure heater outlets and gathers, and gets back to the outlet of certain one-level low-pressure heater after condensate water is absorbed heat by first order gas-water heat exchanger;
In the second level flue gas heat exchange device (32), the flue gas source of fume side is the flue gas of air-introduced machine or optional booster fan outlet, the air source of air side is the cold secondary wind of pressure fan outlet, and perhaps, the air of air side source is a cold wind of primary air fan outlet.
4. flue gas-air heat exchanger as claimed in claim 1 system is characterized in that,
Described first order flue gas heat exchange device (31) is a flue gas-air heat exchanger, when described second level flue gas heat exchange device (32) is the gas-water heat exchanger,
In the first order flue gas heat exchange device (31), the flue gas of fume side source is the boiler smoke of preheater (2) outlet, and the air source of air side is the cold secondary wind of pressure fan outlet, and perhaps, the air of air side source is a cold wind of primary air fan outlet;
In the second level flue gas heat exchange device (32), the flue gas source of fume side is the flue gas of air-introduced machine or optional booster fan outlet, preferably, the condensate water of described condensate water side derives from certain one-level low-pressure heater outlet or some grades of low-pressure heater outlets and gathers, and gets back to the outlet of certain one-level low-pressure heater after condensate water is absorbed heat by first order gas-water heat exchanger.
5. flue gas-air heat exchanger as claimed in claim 1 system is characterized in that the fume side of described first order flue gas heat exchange device (31) and second level flue gas heat exchange device (32) is that serial arrangement is connected.
6. flue gas-air heat exchanger as claimed in claim 1 system is characterized in that, described first order flue gas heat exchange device (31) or second level flue gas heat exchange device (32) adopt surface-type heat exchanger or heat-pipe heat exchanger.
7. flue gas-air heat exchanger as claimed in claim 1 system is characterized in that, described first order flue gas heat exchange device (31) or second level flue gas heat exchange device (32) adopt the indirect-heating heat exchanger that intermediate carrier is arranged.
8. flue gas-air heat exchanger as claimed in claim 1 system is characterized in that each grade flue gas heat exchange device is a heat exchanger, perhaps is the combination of several heat exchangers in parallel.
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2010
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| CN105318313B (en) * | 2015-04-29 | 2018-05-18 | 太原理工大学 | A kind of smoke waste heat utilization system based on SCR denitration device |
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| CN112393267A (en) * | 2020-11-20 | 2021-02-23 | 西安热工研究院有限公司 | Flue gas degree of depth waste heat utilization system of msw incineration power plant |
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