CN212456806U - Waste heat flue gas heating system - Google Patents
Waste heat flue gas heating system Download PDFInfo
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- CN212456806U CN212456806U CN202020715905.8U CN202020715905U CN212456806U CN 212456806 U CN212456806 U CN 212456806U CN 202020715905 U CN202020715905 U CN 202020715905U CN 212456806 U CN212456806 U CN 212456806U
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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
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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Abstract
The utility model discloses a waste heat flue gas heating system and a using method thereof, which comprises a dust remover, wherein the inlet of the dust remover is connected with the outlet of a tail flue, the outlet of the dust remover is connected with a first draught fan, a first branch is also connected on a pipeline between the first draught fan and the outlet of the dust remover, the first branch is divided into a first branch and a second branch, the first branch is connected with the flue gas inlet of a first flue gas heat exchanger, the air inlet of the first flue gas heat exchanger is connected with a primary air fan, the air outlet of the first flue gas heat exchanger is connected with the air inlet of an air preheater arranged in the tail flue, the second branch is connected with the flue gas inlet of a second flue gas heat exchanger, the air inlet of the second flue gas heat exchanger is connected with a secondary air fan, the air outlet of the second flue gas heat exchanger is connected with the air inlet of the air preheater, the utility model improves the temperature of secondary air entering the, reduces the heat loss of the flue gas and is easy to realize industrialization.
Description
Technical Field
The utility model belongs to the technical field of circulating fluidized bed boiler, specifically belong to a waste heat flue gas heating system method.
Background
The air used by the circulating fluidized bed boiler mainly comprises primary air and secondary air, the primary air mainly has the functions of fluidizing bed materials and providing a certain oxygen amount for a dense-phase zone at the lower part of a hearth to combust fuel, and the primary air is sent out by a primary fan; the secondary air mainly has the functions of supplementing oxygen required by fuel combustion in the furnace, simultaneously enhancing mixing of materials, and sending out the secondary air through a secondary fan. In order to prevent unstable combustion conditions and influence on fuel combustion and ignition caused by the air temperature boiler when primary air and secondary air enter the boiler, the temperature of the primary air and the secondary air is required to be increased by absorbing heat of high-temperature flue gas flowing through the air preheater before the primary air and the secondary air enter the boiler. However, due to the influence of factors such as the ambient temperature, the load of the boiler, the heat exchange efficiency of the air preheater and the like, the temperature of the primary air and the secondary air before entering the boiler may be lower, the operation of the boiler is influenced, and particularly, the temperature of the primary air and the secondary air entering the boiler is more difficult to be ensured under various adverse conditions such as lower flue gas temperature level under a low-load working condition, lower ambient temperature under a severe cold working condition in winter, more ash deposition of the air preheater under a poor working condition of coal quality and the like.
At present, three main technical means are provided for ensuring the primary air entering temperature: 1) the conventional air heater is adopted to improve the inlet air temperature of the air preheater, but the pure adoption of the air heater can improve the plant power consumption rate and reduce the operating economy of the boiler. 2) The soot blowing frequency is improved, but the frequent soot blowing not only improves the energy consumption in a plant, but also accelerates the abrasion of tail flue equipment and influences the safety of boiler operation. 3) The better coal type of coal for burning, but because the design of circulating fluidized bed boiler is originally for burning inferior coal type, has weakened circulating fluidized bed boiler's coal type adaptability when burning high-quality coal, and may influence boiler material balance because the ash content is lower during high-quality coal is with fluidized bed boiler, is unfavorable for the stability of boiler operation.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that exists among the prior art, the utility model provides a system of waste heat flue gas heating condensate and overgrate air solves among the prior art wind before going into the stove, and the power consumption of the system that promotes the primary air temperature is higher, and the cost is higher, the poor problem of economic nature.
In order to achieve the above object, the utility model provides a following technical scheme: a waste heat flue gas heating system comprises a dust remover, wherein an inlet of the dust remover is connected with an outlet of a tail flue, an outlet of the dust remover is connected with a first induced draft fan, a pipeline between the first induced draft fan and the outlet of the dust remover is also connected with a first branch, the first branch comprises a first branch, the first branch is connected with a flue gas inlet of a first flue gas heat exchanger, an air inlet of the first flue gas heat exchanger is connected with a primary air fan, an air outlet of the first flue gas heat exchanger is connected with an air inlet of an air preheater arranged in the tail flue, and the first flue gas heat exchanger is used for heating air transmitted by the primary air fan;
the first branch further comprises a second branch, the second branch is connected with a smoke inlet of a second smoke heat exchanger, an air inlet of the second smoke heat exchanger is connected with an overfire air fan, an air outlet of the second smoke heat exchanger is connected with an air inlet of the air preheater, and the second smoke heat exchanger is used for heating air transmitted by the overfire air fan.
And the second induced draft fan is arranged on the first branch and is positioned on the inlet pipelines of the first branch and the second branch.
Further, the outlet of the first induced draft fan is connected to the chimney, and the flue gas outlet of the second flue gas heat exchanger is connected to the outlet pipeline of the first induced draft fan.
Further, the flue gas outlet of the first flue gas heat exchanger is connected to an outlet pipeline of the first induced draft fan.
Further, still be provided with the second branch road on the pipeline between dust remover and the first draught fan, the second branch road is connected to the flue gas entry of cigarette water heat exchanger, be provided with condensate inlet and condensate outlet on the cigarette water heat exchanger, the cigarette water heat exchanger is used for heating the condensate.
Furthermore, a condensed water outlet of the smoke and water heat exchanger is connected with a low-pressure heater, the low-pressure heater is used for heating condensed water transmitted by the smoke and water heat exchanger and transmitting the condensed water to a boiler system, a heat source inlet is further arranged on the low-pressure heater, and the heat source inlet is connected with a first steam outlet of a low-pressure cylinder of the steam turbine.
Further, the air outlet of the smoke and water heat exchanger is connected to an outlet pipeline of the first induced draft fan, a condensed water inlet of the smoke and water heat exchanger is connected with an outlet of a condenser, and an inlet of the condenser is connected with a second steam outlet of a low-pressure cylinder of the steam turbine.
Compared with the prior art, the utility model discloses following beneficial effect has at least:
the utility model provides a waste heat flue gas heating system, set up the flue gas of first branch reposition of redundant personnel dust remover output on the outlet pipeline through the dust remover, export the flue gas to the first gas heater of the exit end setting of a fan in, flue gas and a wind heat transfer are accomplished to first gas heater, export the primary air of heat transfer intensification to air heater in, improve the temperature of primary air at air heater entry, the temperature before the stove is gone into to the primary air has been guaranteed, thereby avoid low temperature corrosion, be favorable to the safe operation of equipment, the heat loss of flue gas has been reduced, the thermal efficiency of boiler has been improved, this system architecture is nimble reliable, need not to reform transform the boiler body, investment cost is lower, easily realize the industrialization.
Further, the utility model discloses a first branch is divided into first shut and the second is shut, first shut heats the breeze, the second is shut and is heated the overgrate air of overfire fan output in second gas heater, in the overgrate air entering air heater after the heating, promote the overgrate air temperature of air heater's entry, make the overgrate air that gets into air heater all keep certain temperature, further avoid air heater low temperature corrosion, be favorable to the safe operation of equipment, improve the overgrate air and go into the temperature before the stove, improve the thermal efficiency of boiler, reduce the heat loss of discharging fume.
Further, the utility model provides a flue gas outlet of first gas heater's exhanst gas outlet and second gas heater's exhanst gas outlet is connected to on the outlet pipe of first draught fan, carry the flue gas of accomplishing in first gas heater and the second gas heater to the outlet pipe of first draught fan on, on the outlet pipe of the first draught fan of rethread after the boiler flue gas is exothermic, carry out abundant utilization with the waste heat of flue gas, then emit into the external world through the chimney, reduce the exhaust gas temperature, reduce the heat loss of discharging fume, abundant utilization has been carried out to the resource.
Further, the utility model discloses a still be provided with the second branch road on the pipeline of dust remover and first draught fan, the second branch road is connected with the cigarette water heat exchanger, the cigarette water heat exchanger carries out the heat transfer with the condensate water and the flue gas of condenser transmission, make the condensate water heat absorption intensification, condensate water after the intensification transmits to low pressure feed water heater in, the temperature of condensate water in the improvement entering low pressure feed water heater, make the required heat source of low pressure feed water heater reduce, the steam volume that low pressure feed water heater needs the steam turbine low pressure jar to provide reduces, the steam extraction of the steam turbine low pressure jar has been reduced, and the steam resource is saved, the thermal efficiency of boiler is improved, this system architecture is nimble reliable, need not to reform transform the boiler body, investment cost is lower, in addition, this system still can be used to buggy stove and other industrial boilers, wide.
The utility model also provides a method for using waste heat flue gas heating system, this method sets up first branch road at the outlet pipeline of dust remover and shunts the flue gas of dust remover outlet pipeline output, first branch road is exported the flue gas to the outlet pipeline of primary air fan and secondary air fan's outlet pipeline on, promote the temperature of primary air and overgrate air, then send primary air and overgrate air into air heater's entry, reduce chimney exhaust gas temperature, reduce the heat loss of discharging fume, the boiler thermal efficiency is improved, the temperature of air heater's entrance primary air and overgrate air has been guaranteed, air heater low temperature corrosion has been avoided, be favorable to the safe operation of equipment, wide application range, easily realize the industrialization.
Further, the utility model discloses a still be provided with the second branch road on the pipeline between dust remover and the first draught fan, the flue gas of second branch road reposition of redundant personnel dust remover output, the flue gas of second branch road with the dust remover output is carried to the smoke and water heat exchanger, the smoke and water heat exchanger heats condenser transmission condensate water, then carry the condensate water after the heating to the low pressure feed water heater in, the low pressure feed water heater continues to heat the condensate water of smoke and water heat exchanger transmission, reduce the volume that the low pressure feed water heater heating condensate water needs steam, make the steam volume that the steam turbine low pressure jar carried to the low pressure feed water heater reduce, reduce the steam extraction volume of the low pressure jar of steam turbine, save steam resource, boiler thermal efficiency is improved.
Drawings
Fig. 1 is a schematic structural view of the present invention;
in the drawings: 1-tail flue, 2-dust remover, 3-first induced draft fan, 4-second induced draft fan, 5-third induced draft fan, 6-chimney, 7-primary air fan, 8-secondary air fan, 9-first flue gas heat exchanger, 10-second flue gas heat exchanger, 11-flue gas water heat exchanger, 12-turbine low pressure cylinder, 13-condenser, 14-low pressure heater, 15-air preheater, 16-first branch, 17-first branch, 18-second branch and 19-second branch.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description.
As shown in fig. 1, the utility model provides a waste heat flue gas heating system, including dust remover 2, the export of entry linkage afterbody flue 1 of dust remover 2, the first draught fan 3 of exit linkage of dust remover 2, the exit linkage chimney 6 of first draught fan 3, be provided with first branch 16 on the pipeline between the export of dust remover 2 and the first draught fan 3, first branch 16 includes first branch 17, first branch 17 is connected with the flue gas inlet of first gas heat exchanger 9, the air inlet of first gas heat exchanger 9 is connected with primary air fan 7, the air outlet of first gas heat exchanger 9 is connected with the air inlet of air heater 15 in afterbody flue 1, first gas heat exchanger 9 is used for heating the air of primary air fan 7 transmission;
in this embodiment, the first branch 16 further includes a second branch 18, the second branch 18 is connected with a second flue gas heat exchanger 10, an air inlet of the second flue gas heat exchanger 10 is connected with an overfire air fan 8, flue gas and overfire air in the second flue gas heat exchanger 10 exchange heat, the overfire air is heated, the heated overfire air enters the air preheater 15, in this embodiment, a flue gas outlet of the first flue gas heat exchanger 9 and a flue gas outlet of the second flue gas heat exchanger 10 are mixed and then connected to an outlet pipeline of the first induced draft fan 3, and then the flue gas is discharged from the chimney 6.
Specifically, the tail flue 1 outputs flue gas to the dust remover 2, the dust remover 2 removes dust in the flue gas and then introduces the flue gas into the chimney 6 through the first induced draft fan 3, meanwhile, a first branch 16 is arranged on an inlet pipeline of the first induced draft fan 3, the second induced draft fan 4 on the first branch 16 introduces part of the flue gas into the first flue gas heat exchanger 9 and the second flue gas heat exchanger 10, an air inlet of the first flue gas heat exchanger 9 is connected with the primary air fan 7, the primary air fan 7 blows primary air into the first flue gas heat exchanger 9, the primary air absorbs heat of the flue gas in the first flue gas heat exchanger 9, then the primary air is input into an air inlet of the air preheater 15 in the tail flue 1 through an air outlet of the first flue gas heat exchanger 9, and the temperature of secondary air entering the air preheater 15 is increased; after the heat of the flue gas in the second flue gas heat exchanger 10 is released, the flue gas is conveyed to an outlet pipeline of the first induced draft fan 3 through a flue gas outlet of the second flue gas heat exchanger 10 and is discharged into a chimney 6; an air inlet of the second flue gas heat exchanger 10 is connected with an overfire air fan 8, overfire air blown by the overfire air fan 8 is sent into the second flue gas heat exchanger 10, the overfire air absorbs heat of flue gas in the second flue gas heat exchanger 10, then the heat is input into an air inlet of the air preheater 15 through an air outlet of the second flue gas heat exchanger 10, the temperature of the overfire air entering the air preheater 15 is raised, and flue gas released by the second flue gas heat exchanger 10 enters an outlet pipeline of the first induced draft fan 3 through a flue gas outlet of the second flue gas heat exchanger 10; the temperature of the primary air and the secondary air is raised, so that the temperature of the primary air and the secondary air entering the air preheater 15 is raised, and low-temperature corrosion is avoided.
In a preferred embodiment of this embodiment, a second branch 19 is further disposed on a pipeline between an outlet of the dust remover 2 and the first induced draft fan 3, a third induced draft fan 5 is disposed on the second branch 19, an outlet of the third induced draft fan 5 is connected to an air inlet of the flue gas-water heat exchanger 11, a condensed water inlet and a condensed water outlet are further disposed on the flue gas-water heat exchanger 11, the condensed water inlet is connected to an outlet of the condenser 13, an inlet of the condenser 13 is connected to a second steam outlet of the turbine low pressure cylinder 12, the turbine low pressure cylinder 12 outputs steam to the condenser 13, the condenser 13 condenses the steam, the condenser 13 outputs the condensed water to the flue gas-water heat exchanger 11, the condensed water in the flue gas-water heat exchanger 11 absorbs heat of the flue gas, the condensed water after absorbing the heat enters the low pressure heater 14, the low pressure heater 14 continues to heat the condensed water, and then conveys the heated condensed water to the, wherein, the heat source of low pressure feed water heater 14 comes from steam turbine low pressure cylinder 12, the first steam outlet connection low pressure feed water heater 14 of steam turbine low pressure cylinder 12 enters the heat source entry of low pressure feed water heater 14, steam turbine low pressure cylinder 12 bleeds and provides the heat source to low pressure feed water heater 14 further heating, because the condensate water has heated before entering low pressure feed water heater 14, consequently, the required heat of low pressure feed water heater 14 reduces, thereby reduced steam turbine low pressure cylinder 12 air extraction, the boiler thermal efficiency has been improved, flue gas that the heat transfer was accomplished gets into in the outlet duct of first draught fan 3 by the exhanst gas outlet of smoke and water heat exchanger 11, discharge in chimney 6.
The utility model discloses a concrete implementation step as follows: the tail flue 1 transmits flue gas to the dust remover 2, the dust remover 2 removes dust in the flue gas and then transmits the flue gas to the first induced draft fan 3, the first induced draft fan 3 transmits the flue gas to the chimney 6, the flue gas is discharged from the chimney 6, meanwhile, the first induced draft fan 3 guides out part of the flue gas to the first branch 17 and the second branch 18, the flue gas guided out by the first induced draft fan 3 enters the first flue gas heat exchanger 9, the first flue gas heat exchanger 9 exchanges heat with primary air transmitted by the primary air fan 7, the heated primary air enters the air preheater 15, and the flue gas subjected to heat release in the first flue gas heat exchanger 9 enters an outlet pipeline of the first induced draft fan 3 through a flue gas outlet of the first flue gas heat exchanger 9; the flue gas of the second flue gas heat exchanger 10 of the second branch 18 exchanges heat with the secondary air transmitted by the secondary air fan 8, the heated secondary air enters the air preheater 15, and the flue gas subjected to heat exchange and temperature reduction enters the outlet pipeline of the first induced draft fan 3 from the flue gas outlet of the second flue gas heat exchanger 10;
meanwhile, a third induced draft fan 5 on the second branch 19 introduces part of the flue gas into the flue gas-water heat exchanger 11, the flue gas and the condensed water in the flue gas-water heat exchanger 11 exchange heat, wherein the condensed water in the flue gas-water heat exchanger 11 outputs steam from a first steam outlet of a turbine low-pressure cylinder 12 to a condenser 13, the condenser 13 converts the steam into the condensed water, then the condenser 13 outputs the condensed water into the flue gas-water heat exchanger 11, the flue gas subjected to heat exchange and temperature reduction enters an outlet pipeline of the first induced draft fan 3 through a flue gas outlet of the flue gas-water heat exchanger 11, the condensed water subjected to heat exchange and temperature rise enters a low-pressure heater 14, the low-pressure heater 14 outputs the condensed water into a boiler system, wherein a heat source of the low-pressure heater 14 comes from the turbine low-pressure cylinder 12, the first steam outlet of the turbine low-pressure cylinder 12 outputs part of the steam to the low-pressure heater 14 to provide a heat source for the low-pressure, thereby reducing the heat required by the low-pressure heater 14, reducing the air extraction amount of the steam turbine low-pressure cylinder 12 and improving the thermal efficiency of the boiler.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solution of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still modify or easily conceive of changes in the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The waste heat flue gas heating system is characterized by comprising a dust remover (2), wherein an inlet of the dust remover (2) is connected with an outlet of a tail flue (1), the outlet of the dust remover (2) is connected with a first induced draft fan (3), a first branch (16) is connected on a pipeline between the first induced draft fan (3) and the outlet of the dust remover (2), the first branch (16) comprises a first branch (17), the first branch (17) is connected with a flue gas inlet of the first flue gas heat exchanger (9), the air inlet of the first flue gas heat exchanger (9) is connected with a primary air fan (7), the air outlet of the first flue gas heat exchanger (9) is connected with the air inlet of an air preheater (15) arranged in the tail flue (1), the first flue gas heat exchanger (9) is used for heating air transmitted by the primary air fan (7).
2. A waste heat flue gas heating system according to claim 1, wherein the first branch (16) further comprises a second branch (18), the second branch (18) is connected with a flue gas inlet of a second flue gas heat exchanger (10), an air inlet of the second flue gas heat exchanger (10) is connected with an overfire air fan (8), an air outlet of the second flue gas heat exchanger (10) is connected with an air inlet of the air preheater (15), and the second flue gas heat exchanger (10) is used for heating air transmitted by the overfire air fan (8).
3. The waste heat flue gas heating system according to claim 1, further comprising a second induced draft fan (4), wherein the second induced draft fan (4) is arranged on the first branch (16) and is located on inlet pipelines of the first branch (17) and the second branch (18).
4. A waste heat and flue gas heating system according to claim 2, wherein the outlet of the first induced draft fan (3) is connected to the chimney (6), and the flue gas outlet of the second flue gas heat exchanger (10) is connected to the outlet pipeline of the first induced draft fan (3).
5. A waste heat and flue gas heating system according to claim 1, wherein the flue gas outlet of the first flue gas heat exchanger (9) is connected to the outlet duct of the first induced draft fan (3).
6. The waste heat and flue gas heating system according to claim 1, wherein a second branch (19) is further arranged on a pipeline between the dust remover (2) and the first induced draft fan (3), the second branch (19) is connected to a flue gas inlet of the flue gas-water heat exchanger (11), a condensed water inlet and a condensed water outlet are arranged on the flue gas-water heat exchanger (11), and the flue gas-water heat exchanger (11) is used for heating condensed water.
7. A waste heat and smoke heating system as claimed in claim 6, wherein a condensed water outlet of said smoke and water heat exchanger (11) is connected with a low pressure heater (14), said low pressure heater (14) is used for heating the condensed water transmitted by said smoke and water heat exchanger (11) and transmitting the condensed water to a boiler system, said low pressure heater (14) is further provided with a heat source inlet, said heat source inlet is connected with a first steam outlet of a steam turbine low pressure cylinder (12).
8. A waste heat and flue gas heating system as claimed in claim 6, wherein an air outlet of the flue-water heat exchanger (11) is connected to an outlet pipeline of a first induced draft fan (3), a condensed water inlet of the flue-water heat exchanger (11) is connected to an outlet of a condenser (13), and an inlet of the condenser (13) is connected to a second steam outlet of the steam turbine low pressure cylinder (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020715905.8U CN212456806U (en) | 2020-04-30 | 2020-04-30 | Waste heat flue gas heating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020715905.8U CN212456806U (en) | 2020-04-30 | 2020-04-30 | Waste heat flue gas heating system |
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| Publication Number | Publication Date |
|---|---|
| CN212456806U true CN212456806U (en) | 2021-02-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020715905.8U Active CN212456806U (en) | 2020-04-30 | 2020-04-30 | Waste heat flue gas heating system |
Country Status (1)
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|---|---|
| CN (1) | CN212456806U (en) |
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2020
- 2020-04-30 CN CN202020715905.8U patent/CN212456806U/en active Active
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