CN203036658U - Boiler flue gas waste heat multipurpose utilization system - Google Patents

Boiler flue gas waste heat multipurpose utilization system Download PDF

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Publication number
CN203036658U
CN203036658U CN2012206754704U CN201220675470U CN203036658U CN 203036658 U CN203036658 U CN 203036658U CN 2012206754704 U CN2012206754704 U CN 2012206754704U CN 201220675470 U CN201220675470 U CN 201220675470U CN 203036658 U CN203036658 U CN 203036658U
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heat
water
low
supply network
valve
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CN2012206754704U
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张润盘
辛建华
贾绍广
张端
杨立辉
阎占良
郝文广
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China Electric Power Construction Group Hebei electric survey and Design Research Institute Co., Ltd.
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Hebei Electric Power Design and Research Institute
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/30Technologies for a more efficient combustion or heat usage

Abstract

The utility model discloses a boiler flue gas waste heat multipurpose utilization system including a low-temperature coal economizer for exchanging heat in flue gas into a heat exchanging medium, and a condense water heating branch and a heating network circulation water heating branch communicated with the low-temperature coal economizer. The condense water heating branch includes a condensing water pipeline and a plurality of groups of low-pressure heaters, a control valve is arranged between the two groups of low-pressure heaters in the middle part of the condensing water pipeline, the two ends of the control valve are communicated with the water inlet and the water outlet of the low-temperature coal economizer via two condensing water branches, and the heating network circulation water heating branch includes a heating network circulation water pipeline, and a circulating pump and a plate type heat exchanger which are successively arranged on the heating network circulation water pipeline. The system provided adopts the low-temperature coal economizer to heat the condense water and the heating network circulation water by means of the heat energy absorbed from the flue gas, thus the heat released from coal combustion can be fully utilized and the waste heat in the boiler flue gas is effectively utilized.

Description

The residual heat from boiler fume multipurpose is utilized system
Technical field
The utility model belongs to the energy-conserving and environment-protective field, is specifically related to a kind of residual heat from boiler fume and utilizes system.
Background technology
In the daily life, electric energy provides a great convenience for people, and the little normal lighting that arrives arrives industrial production greatly, and the benefit that electric energy brings people is seen everywhere.Yet present stage, the fuel in power plant is based on coal, and along with the continuous increase of generated energy, coal-fired thermal power factory is also more and more obvious to the negative effect that environment brings.On the one hand, coal belongs to fossil fuel, and reproduction speed is very slow, and on the other hand, burning coal can produce a large amount of greenhouse gases and pollution gas.Therefore pollute for energy savings, minimizing, the energy utilization rate that improves coal-fired thermal power factory is the technical problem that needs to be resolved hurrily.For coal-fired thermal power factory, what the accounting example was maximum in the boiler heat loss is heat loss due to exhaust gas.In general, l0 ℃ of the every reduction of exhaust gas temperature, boiler thermal output improves about 0.5% to 0.6%.Therefore, the rational and efficient use fume afterheat is the effective way that improves coal-fired thermal power factory energy utilization rate.
Chinese patent CN102338371A discloses a kind of fume afterheat and has utilized system, and the flue gas heat exchange device is installed in order to absorbing the heat in the flue gas by this system between air preheater and deduster, and with the heat that absorbs in order to heat-setting water.Though this system has also utilized fume afterheat, whole energy utilization rate promotes little.
Chinese patent CN102759096A discloses a kind of fume afterheat and has utilized system, comprises being arranged between electric cleaner and the desulfurizing tower in order to reclaiming the gas cooler of flue gas heat, and is arranged on the condensate water conveyance conduit first, second and coagulates heat exchanger.This system has realized the combustion air that utilizes fume afterheat heat-setting water and heater blower to blow out, but its pipeline is long, and the thermal losses in the cyclic process is bigger, and if cooling water when not heating, deal with improperly and can cause water resource waste.
The utility model content
The utility model technical issues that need to address provide a kind of residual heat from boiler fume multipurpose and utilize system, to overcome the shortcoming that traditional hot power-plant flue gas heat loss is big, energy utilization rate is low.
For solving the problems of the technologies described above, technical solution adopted in the utility model is as follows.
A kind of residual heat from boiler fume multipurpose is utilized system, comprise by heat transferring medium be used for the flue gas exchange heat in the heat transferring medium low-level (stack-gas) economizer and condensate water heating branch road and the heat supply network recirculated water that is communicated with low-level (stack-gas) economizer heat branch road; Described condensate water heating branch road comprises for delivery of the condensing water conduit of condensate water and some groups low of being successively set on the condensing water conduit and adding, between adding, two groups low of condensing water conduit middle part are provided with control valve, the two ends of control valve are communicated with water inlet and the delivery port of low-level (stack-gas) economizer heat transferring medium by two condensate water branch roads respectively, and described condensate water branch road is provided with valve Z1 and the valve Z2 that control condensate water branch road turns on and off; Described heat supply network recirculated water heating branch road comprises for delivery of the heat supply network circulating water pipeline of heat supply network recirculated water and is successively set on circulating pump and plate type heat exchanger on the heat supply network circulating water pipeline that described heat supply network circulating water pipeline two ends are communicated with water inlet and the delivery port of low-level (stack-gas) economizer heat transferring medium by valve Z3 and valve Z4 respectively.
Because the technological progress of having adopted technique scheme, the utility model to obtain is as follows.
The heat energy that the utility model will absorb from flue gas by low-level (stack-gas) economizer is used for heat-setting water and heat supply network recirculated water, thereby the heat that coal burning is discharged is fully utilized, and has effectively utilized the waste heat in the boiler smoke.Utilize fume afterheat heat-setting water can make condensate water with higher temperature flow back boiler, thereby reduce extracted steam from turbine, reduce the generating coal consumption; Utilize fume afterheat heating heat supply network recirculated water, with respect to utilizing the high-temperature steam in the steam turbine to heat heat supply network recirculated water in the conventional art, it is low obviously to have a loss, the advantage that energy utilization rate is high.
Description of drawings
Fig. 1: perspective view of the present utility model.
Wherein: 1. low-level (stack-gas) economizer, first low the adding of 2-1., second low the adding of 2-2., 2-3. the 3rd low adding, 2-4. the 4th low adding, 3. steam turbine, 4. control valve, 4-1. valve Z1,4-2. valve Z2,4-3. valve Z3,4-4. valve Z4,5-1. heat exchangers for district heating A, 5-2. heat exchangers for district heating B, 6. circulating pump, 7. water replanishing device, 8. plate type heat exchanger.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the utility model is done further to describe in detail:
A kind of residual heat from boiler fume multipurpose is utilized system, as shown in Figure 1, and the condensate water heating branch road and the heat supply network recirculated water heating branch road that comprise low-level (stack-gas) economizer 1 and be communicated with low-level (stack-gas) economizer 1.Low-level (stack-gas) economizer 1 is arranged in the pipeline of discharging boiler smoke, and its effect is by heat exchange the waste heat in the flue gas to be exchanged in the heat transferring medium, thereby realizes the recovery of the energy.
Condensate water heating branch road comprises condensing water conduit 9 and four groups low of being successively set on the condensing water conduit add.Wherein, lowly add 2-2 and the 3rd low adding was provided with control valve 4 between the 2-3 at second of condensing water conduit middle part.The two ends of control valve 4 are provided with two condensate water branch roads, and these two condensate water branch roads are communicated with water inlet and the delivery port of low-level (stack-gas) economizer by valve Z1 and valve Z2 respectively.
Heat supply network recirculated water heating branch road comprises heat supply network circulating water pipeline 10 and is successively set on water replanishing device 7, circulating pump 6 and plate type heat exchanger 8 on the heat supply network circulating water pipeline.Heat supply network circulating water pipeline 10 two ends are communicated with water inlet and the delivery port of low-level (stack-gas) economizer 1 by valve Z3 and valve Z4 respectively.It is in order in time to replenish the recirculated water loss that causes owing to reasons such as evaporation, seepages that water replanishing device 7 is set.Circulating pump 6 is set is in order to control the water circulating speed of heat supply network recirculated water heating branch road, make the flow velocity of heat supply network recirculated water heating branch road to adjust according to heating demand and fume afterheat absorption efficiency.
When system operates in summer condition, only need utilize fume afterheat heat-setting water and need not external heating, this moment, control valve 4 was closed, and valve Z1, valve Z2 open, and valve Z3, valve Z4 close.Condensate water flow out second low add 2-2 after, through valve Z1, in low-level (stack-gas) economizer 1, absorb the waste heat in the flue gas and become the higher condensate water of temperature, entered for the 3rd low adding through valve Z2 again, finally become high-temperature steam through after the follow-up heating, the high-temperature steam generating of doing work in steam turbine 3 has namely realized utilizing fume afterheat to carry out heat-setting water.
When system operates in winter condition, need externally heating, the work of heat supply network recirculated water heating this moment branch road, control valve 4, valve Z3, valve Z4 open, valve Z1, valve Z2 close, and the recirculated water in the heat supply network recirculated water heating branch road absorbs the waste heat in the flue gas at low-level (stack-gas) economizer 1 place, provide heat energy at plate type heat exchanger 8 places for outside heat supply network through valve Z4, after finishing heat exchange, the recirculated water that temperature is lower comes back to low-level (stack-gas) economizer 1 through circulating pump 6, valve Z3 and water replanishing device 7.Can realize utilizing fume afterheat heating heat supply network recirculated water thus, for the user provides central heating.

Claims (2)

1. a residual heat from boiler fume multipurpose is utilized system, comprise by heat transferring medium and be used for the low-level (stack-gas) economizer (1) of flue gas exchange heat in the heat transferring medium be is characterized in that: comprise that also the condensate water heating branch road and the heat supply network recirculated water that are communicated with low-level (stack-gas) economizer (1) heat branch road;
Described condensate water heating branch road comprises the condensing water conduit (9) for delivery of condensate water and some groups low of being successively set on the condensing water conduit add, between adding, two groups low of condensing water conduit middle part are provided with control valve (4), the two ends of control valve (4) are communicated with water inlet and the delivery port of low-level (stack-gas) economizer (1) heat transferring medium by two condensate water branch roads respectively, and described condensate water branch road is provided with valve Z1 (4-1) and the valve Z2 (4-2) that control condensate water branch road turns on and off;
Described heat supply network recirculated water heating branch road comprises for delivery of the heat supply network circulating water pipeline (10) of heat supply network recirculated water and is successively set on circulating pump (6) and plate type heat exchanger (8) on the heat supply network circulating water pipeline (10) that described heat supply network circulating water pipeline (10) two ends are passed through valve Z3 (4-3) and valve Z4 (4-4) respectively and are communicated with water inlet and the delivery port of low-level (stack-gas) economizer (1) heat transferring medium.
2. a kind of residual heat from boiler fume multipurpose according to claim 1 is utilized system, it is characterized in that: the water replanishing device (7) that promising heat supply network recirculated water heating branch road replenishes heat transferring medium also is set in the described heat supply network circulating water pipeline (10).
CN2012206754704U 2012-12-10 2012-12-10 Boiler flue gas waste heat multipurpose utilization system Active CN203036658U (en)

Priority Applications (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105180144A (en) * 2015-08-14 2015-12-23 中国能源建设集团广东省电力设计研究院有限公司 Boiler flue gas waste heat recovery system
CN109028047A (en) * 2018-06-29 2018-12-18 国网山东省电力公司电力科学研究院 A kind of recirculating fluidized bed thermal power plant unit slag cooler afterheat utilizing system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105180144A (en) * 2015-08-14 2015-12-23 中国能源建设集团广东省电力设计研究院有限公司 Boiler flue gas waste heat recovery system
CN105180144B (en) * 2015-08-14 2018-03-16 中国能源建设集团广东省电力设计研究院有限公司 Residual heat from boiler fume recovery system
CN109028047A (en) * 2018-06-29 2018-12-18 国网山东省电力公司电力科学研究院 A kind of recirculating fluidized bed thermal power plant unit slag cooler afterheat utilizing system

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Address after: 050031 No. 6 Jianhua Street, Shijiazhuang City, Hebei Province

Patentee after: China Electric Power Construction Group Hebei electric survey and Design Research Institute Co., Ltd.

Address before: 050031 No. 6 Jianhua Street, Shijiazhuang City, Hebei Province

Patentee before: Hebei Province Power Surveying Design & Research Institute