CN102012169B - Method for secondarily recycling smoke gas waste heat of continuous annealing furnace - Google Patents

Method for secondarily recycling smoke gas waste heat of continuous annealing furnace Download PDF

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Publication number
CN102012169B
CN102012169B CN2010106089364A CN201010608936A CN102012169B CN 102012169 B CN102012169 B CN 102012169B CN 2010106089364 A CN2010106089364 A CN 2010106089364A CN 201010608936 A CN201010608936 A CN 201010608936A CN 102012169 B CN102012169 B CN 102012169B
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input
valve
pipe
flue gas
water pipe
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CN102012169A (en
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石祥
于海
陈元元
郑剑辉
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Wisdri Wuhan Wis Industrial Furnace Co Ltd
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Wisdri Wuhan Wis Industrial Furnace Co Ltd
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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
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency

Abstract

The invention relates to a method for secondarily recycling smoke gas waste heat of a continuous annealing furnace, belonging to the technical field of a band steel continuous annealing furnace, and being expansively applied to the smoke gas waste heat recovery in other fields. The method for secondarily recycling smoke gas waste heat of a continuous annealing furnace is characterized by the following step: performing heat exchange between the low temperature smoke gas generated after primarily recycling the smoke gas waste heat of the continuous annealing furnace and the cooling return water after the water cooling roller of the annealing furnace is cooled through a heat exchanger of a secondary recycling system, wherein the cooling return water passes through the heat exchanger for heat exchange and then is heated and sent to a cleaning section for use. The method not only saves heat energy but also saves a large quantity of cooling water in the cleaning section, and simultaneously reduces operation cost.

Description

The method that flue gas waste heat of continuous annealing furnace is recycled for the second time
Technical field
The present invention relates to the method that a kind of flue gas waste heat of continuous annealing furnace is recycled for the second time, belong to the continuous strip annealing furnace technical field, can expand the flue gas waste heat recovery that is applied to other field.
Background technology
After a waste heat recovery of Qi gas heat exchanger, the burning waste gas of annealing furnace flue-gas temperature has dropped to about 400 ℃, because heat content is lower, process at present " low-temperature flue gas " most way to be to mix a certain proportion of cold air in flue gas, directly discharging after its temperature is down to about 250 ℃ that satisfy the blower fan requirement, so virtually waste a large amount of heat energy, also increased simultaneously the load of smoke exhaust fan.
For radiant tube type heating furnace, also have and adopt take " superheated water " as carrier, to the about 400 ℃ of modes that left and right sides fume afterheat reclaims again after the heat recovery, for other operations of annealing unit such as the users such as cleaning section, heated-air drying section provide thermal source.
But this waste heat secondary recovery utilize mode because of " superheated water " pressure medium up to 0.5~0.7Mpa, therefore whole system is comparatively complicated, control accuracy is had relatively high expectations, and the equipment such as heat exchanger, expansion drum need professional pressure vessel producer to make, and the whole system investment is higher.This system seldom uses at the NOF direct firing furnace in addition, because cause easily the fluctuation of NOF furnace pressure in adjustment process.
Summary of the invention
" low-temperature flue gas " after recycling for the first time for flue gas waste heat of continuous annealing furnace, the method that the object of the present invention is to provide a kind of flue gas waste heat of continuous annealing furnace to recycle for the second time, the method is saving heat energy not only, also saves the cooling water of a large amount of cleaning sections.
For achieving the above object, the technical solution used in the present invention is: the method that flue gas waste heat of continuous annealing furnace is recycled for the second time, it is characterized in that: the heat exchanger of the low-temperature flue gas after flue gas waste heat of continuous annealing furnace is recycled for the first time by secondary recycling system with the annealing furnace water cooled rolls carried out cooled cooling backwater carry out heat exchange, described cooling backwater carries out sending into cleaning section after heat exchange heats up through heat exchanger to be used.
The temperature of described low-temperature flue gas is 380~420 ℃.
Described secondary recycling system comprise cool back water pipe 1, storage tank 2, mend new water pipe 3, magnetic valve 4, liquid level sensor 5, the first input water pipe 6, the first check-valves 7, the first water pump 8, the first valve 9, heat exchanger 14, the 3rd valve 16, output water pipe 19, the 4th valve 21, flue gas input pipe 25, flue gas efferent duct 27; The input termination that cools back water pipe 1 is carried out cooled cooling backwater to the annealing furnace water cooled rolls, the output that cools back water pipe 1 is connected with storage tank 2, mend the input termination make-up water source of new water pipe 3, the output of mending new water pipe 3 is connected with storage tank 2, mend new water pipe 3 and be provided with magnetic valve 4, storage tank 2 is provided with liquid level sensor 5; The input of the first input water pipe 6 is connected with storage tank 2, the output of the first input water pipe 6 is connected with the aqueous medium input port of heat exchanger 14, be provided with successively the first valve 9, the first water pump 8, the first check-valves 7, the 3rd valve 16 on the first input water pipe 6, the first valve 9 is near storage tank 2, the three valves 16 close heat exchangers 14; The input of output water pipe 19 is connected with the aqueous medium delivery outlet of heat exchanger 14, and the output of output water pipe 19 is connected with the hot water rinse bath 27 that is used for the cleaning section use, and output water pipe 19 is provided with the 4th valve 21, the four valves 21 near heat exchanger 14; The input of flue gas input pipe 25 continues the low-temperature flue gas after waste heat of flue gas of annealing furnace is recycled for the first time in succession, the output of flue gas input pipe 25 is connected with the flue gas medium input port of heat exchanger 14, and the flue gas medium delivery outlet of heat exchanger 14 connects a flue gas efferent duct 27.
Be provided with successively the second valve 13, the second water pump 12, the second check-valves 11, the second valves 13 near storage tank 2 on the input of described the first valve 9 one second input water pipe in parallel with the output of the first check-valves 7 10, the second input water pipes 10.
Described the first input water pipe 6 is connected a bypass pipe 17 with exporting between the water pipe 19, and bypass pipe 17 is provided with by-passing valve 18.
Be connected to the first delivery pipe on described the first input water pipe 6, the input of the first delivery pipe is between the aqueous medium input port and the 3rd valve 16 of heat exchanger 14, and the first delivery pipe is provided with the first drain valve 15; Be connected to the second delivery pipe on the output water pipe 19, the input of the second delivery pipe is between the aqueous medium delivery outlet and the 4th valve 21 of heat exchanger 14, and the second delivery pipe is provided with the second drain valve 20.
The bottom of described storage tank 2 is connected with the input of the 3rd delivery pipe 22, the output of the 3rd delivery pipe 22 ditch of running in, and the 3rd delivery pipe 22 is provided with the 5th valve 23, the five valves 23 near storage tanks 2; The overfall of storage tank 2 connects the input of overflow pipe 24, and the output of overflow pipe 24 is connected with the 3rd delivery pipe 22.
The invention has the beneficial effects as follows:
1) the method is to carry out cooled cooling backwater (" hot water ") as medium to the annealing furnace water cooled rolls, after " hot water " that the temperature of original directly discharging is about 50 ℃ and the heat exchange of " low-temperature flue gas " after waste heat recovery process heat exchanger, all be fully utilized again, saving heat energy not only, also save a large amount of cooling waters (cleaning section), kill two birds with one stone.
2) carry out waste heat recovery by the method and need not regulate flue gas flow, can not cause fluctuation to the smoke evacuation system furnace pressure, so the method can be applicable to the flue gas waste heat recovery of NOF direct firing furnace.
3) the method water direct heat-exchange that flue gas and cleaning section user is required, than the few one-level heat-exchange system of superheated water waste heat recovery mode, so heat exchange efficiency is higher, and heat loss is lower.
4) heat exchanger adopts the band fin-tube heat exchanger, and the equipment and technology maturation is safe and reliable, and pressure medium is lower, enters cleaning section if the generation seepage can switch to bypass with water rapidly, and is simple to operate.
5) water pump adopts the using and the reserved to arrange, greatly improves the guarantee that cleaning section supplies water.
Method of the present invention except using, also can be widely used in other such as the flue gas waste heat recovery of power industry in continuous annealing furnace.
Description of drawings
Fig. 1 recycles schematic diagram the second time of flue gas waste heat of continuous annealing furnace.
Among the figure: 1-cools back water pipe, and 2-storage tank, 3-are mended new water pipe, the 4-magnetic valve, 5-liquid level sensor, 6-the first input water pipe, 7-the first check-valves, the 8 one the first water pumps, 9-the first valve, 10-the second input water pipe, 11-the second check-valves, 12-the second water pump, 13-the second valve, 14-heat exchanger, 15-the first drain valve, 16-the 3rd valve, 17-bypass pipe, 18-by-passing valve, 19-exports water pipe, 20-the second drain valve, 21-the 4th valve, 22-the 3rd delivery pipe, 23-the 5th valve, 24-overflow pipe, 25-flue gas input pipe, 26-flue gas efferent duct, 27-hot water rinse bath.
The specific embodiment
The method that flue gas waste heat of continuous annealing furnace is recycled for the second time: the heat exchanger of the low-temperature flue gas after flue gas waste heat of continuous annealing furnace recycled for the first time by secondary recycling system with the annealing furnace water cooled rolls carried out cooled cooling backwater (be annealed the stove water cooled rolls and be heated to about 50 ℃) carry out heat exchange, (being heated to 60 ℃ or higher) sent into cleaning section and used after described cooling backwater carried out heat exchange and heats up through heat exchanger.
The temperature of described low-temperature flue gas is 380~420 ℃.
As shown in Figure 1, described secondary recycling system comprises and cools back water pipe 1, storage tank 2, mend new water pipe 3, magnetic valve 4, liquid level sensor 5, the first input water pipe 6, the first check-valves 7, the first water pump 8, the first valve 9, the second input water pipe 10, the second check-valves 11, the second water pump 12, the second valve 13, heat exchanger 14, the first delivery pipe, the first drain valve 15, the 3rd valve 16, bypass pipe 17, by-passing valve 18, output water pipe 19, the second delivery pipe, the second drain valve 20, the 4th valve 21, the 3rd delivery pipe 22, the 5th valve 23, overflow pipe 24, flue gas input pipe 25, flue gas efferent duct 27; The input termination that cools back water pipe 1 is carried out cooled cooling backwater to the annealing furnace water cooled rolls, the output that cools back water pipe 1 is connected with storage tank 2, mend the input termination make-up water source of new water pipe 3, the output of mending new water pipe 3 is connected with storage tank 2, mend new water pipe 3 and be provided with magnetic valve 4, storage tank 2 is provided with liquid level sensor 5; The input of the first input water pipe 6 is connected with storage tank 2, the output of the first input water pipe 6 is connected with the aqueous medium input port of heat exchanger 14, be provided with successively the first valve 9, the first water pump 8, the first check-valves 7, the 3rd valve 16 on the first input water pipe 6, the first valve 9 is near storage tank 2, the three valves 16 close heat exchangers 14; The input of output water pipe 19 is connected with the aqueous medium delivery outlet of heat exchanger 14, and the output of output water pipe 19 is connected with the hot water rinse bath 27 that is used for the cleaning section use, and output water pipe 19 is provided with the 4th valve 21, the four valves 21 near heat exchanger 14; The input of flue gas input pipe 25 continues the low-temperature flue gas after waste heat of flue gas of annealing furnace is recycled for the first time in succession, the output of flue gas input pipe 25 is connected with the flue gas medium input port of heat exchanger 14, and the flue gas medium delivery outlet of heat exchanger 14 connects a flue gas efferent duct 27.
Be provided with successively the second valve 13, the second water pump 12, the second check-valves 11, the second valves 13 near storage tank 2 on the input of described the first valve 9 one second input water pipe in parallel with the output of the first check-valves 7 10, the second input water pipes 10.
Described the first input water pipe 6 is connected a bypass pipe 17 with exporting between the water pipe 19, and bypass pipe 17 is provided with by-passing valve 18.
Be connected to the first delivery pipe on described the first input water pipe 6, the input of the first delivery pipe is between the aqueous medium input port and the 3rd valve 16 of heat exchanger 14, and the first delivery pipe is provided with the first drain valve 15; Be connected to the second delivery pipe on the output water pipe 19, the input of the second delivery pipe is between the aqueous medium delivery outlet and the 4th valve 21 of heat exchanger 14, and the second delivery pipe is provided with the second drain valve 20.
The bottom of described storage tank 2 is connected with the input of the 3rd delivery pipe 22, the output of the 3rd delivery pipe 22 ditch of running in, and the 3rd delivery pipe 22 is provided with the 5th valve 23, the five valves 23 near storage tanks 2; The overfall of storage tank 2 connects the input of overflow pipe 24, and the output of overflow pipe 24 is connected with the 3rd delivery pipe 22.
Heat exchanger adopts the band fin-tube heat exchanger.
The water side:
Cooling backwater (is that cooling water cools off the annealing furnace water cooled rolls from the waste water of NOF water cooled rolls discharging mainly, the backwater that produces, or title waste water), about 50 ℃ of this part coolant-temperature gage, because not satisfying usually directly discharging of service condition, now be recycled to storage tank 2 as the water source of this residual neat recovering system by cooling back water pipe 1; Storage tank 2 is provided with new water supply contact simultaneously, to guarantee the cleaning section water consumption, this node is provided with magnetic valve 4, and form closed-loop controls with the liquid level sensor 5 of storage tank, magnetic valve 4 is automatically opened and is replenished new water, the setting value shut electromagnetic valve until water level attains to a high place when storage tank 2 liquid levels are lower than the low level setting value; Storage tank 2 also is designed with overflow mechanism (overflow pipe), can directly unnecessary water be drained into the waste effluent flume by overflow mechanism when water cooled rolls discharge water flow is larger.
By the first water pump 8 (or the second water pump 12, for subsequent use) water of storage tank 2 is squeezed into heat exchanger 14, water pump is that the using and the reserved are arranged, after cooling backwater enters heat exchanger 14, by heat exchanger its temperature is risen to 60 ℃; Heat exchanger 14 water sides are imported and exported and respectively are provided with 1 cover thermocouple for detection of water temperature, are provided with 1 pressure switch at heat exchanger water side outlet simultaneously, and when detecting the pressure anomaly alarm, whether this pressure switch mainly detects heat exchanger and leak.
Cause a hidden trouble just in case occur to reveal in order to prevent the water in the Tube Sheet of Heat Exchanger, in the import and export of heat exchanger water side bypass system is set, when water pipe leaks or other reason when causing not possessing the water flowing condition, make water directly flow to cleaning section without heat exchanger, can discharge the water in the Tube Sheet of Heat Exchanger simultaneously.
Fume side:
Low-temperature flue gas (400 ℃ of flue gases) enters heat exchanger (5) with after the water heating, flue-gas temperature is down to about 180 ℃, this temperature has satisfied the smoke exhaust fan requirement, thereby do not need to mix a large amount of cold wind, simultaneously because temperature reduces the minimizing of flue gas actual flow, in view of these two factors, the type selecting of smoke exhaust fan can reduce, and operating cost also decreases.
The heat exchanger smoke entrance is respectively established a cover thermocouple, for detection of the smoke entrance temperature.

Claims (5)

1. the method recycled for the second time of flue gas waste heat of continuous annealing furnace, it is characterized in that: the heat exchanger of the low-temperature flue gas after flue gas waste heat of continuous annealing furnace is recycled for the first time by secondary recycling system with the annealing furnace water cooled rolls carried out cooled cooling backwater carry out heat exchange, described cooling backwater carries out sending into cleaning section after heat exchange heats up through heat exchanger to be used;
Described secondary recycling system comprise cool back water pipe (1), storage tank (2), mend new water pipe (3), magnetic valve (4), liquid level sensor (5), the first input water pipe (6), the first check-valves (7), the first water pump (8), the first valve (9), heat exchanger (14), the 3rd valve (16), output water pipe (19), the 4th valve (21), flue gas input pipe (25), flue gas efferent duct (27); The input termination that cools back water pipe (1) is carried out cooled cooling backwater to the annealing furnace water cooled rolls, the output that cools back water pipe (1) is connected with storage tank (2), mend the input termination make-up water source of new water pipe (3), the output of mending new water pipe (3) is connected with storage tank (2), mend new water pipe (3) and be provided with magnetic valve (4), storage tank (2) is provided with liquid level sensor (5); The input of the first input water pipe (6) is connected with storage tank (2), the output of the first input water pipe (6) is connected with the aqueous medium input port of heat exchanger (14), be provided with successively the first valve (9), the first water pump (8), the first check-valves (7), the 3rd valve (16) on the first input water pipe (6), the first valve (9) is near storage tank (2), and the 3rd valve (16) is near heat exchanger (14); The input of output water pipe (19) is connected with the aqueous medium delivery outlet of heat exchanger (14), the output of output water pipe (19) is connected with the hot water rinse bath (27) that is used for the cleaning section use, output water pipe (19) is provided with the 4th valve (21), and the 4th valve (21) is near heat exchanger (14); The input of flue gas input pipe (25) continues the low-temperature flue gas after waste heat of flue gas of annealing furnace is recycled for the first time in succession, the output of flue gas input pipe (25) is connected with the flue gas medium input port of heat exchanger (14), and the flue gas medium delivery outlet of heat exchanger (14) connects a flue gas efferent duct (27).
2. the method recycled for the second time of flue gas waste heat of continuous annealing furnace according to claim 1, it is characterized in that: the input of described the first valve (9) one second input water pipe (10) in parallel with the output of the first check-valves (7), be provided with successively the second valve (13), the second water pump (12), the second check-valves (11) on the second input water pipe (10), the second valve (13) is near storage tank (2).
3. the method recycled for the second time of flue gas waste heat of continuous annealing furnace according to claim 1, it is characterized in that: described the first input water pipe (6) is connected a bypass pipe (17) with exporting between the water pipe (19), and bypass pipe (17) is provided with by-passing valve (18).
4. the method recycled for the second time of flue gas waste heat of continuous annealing furnace according to claim 1, it is characterized in that: be connected to the first delivery pipe on described the first input water pipe (6), the input of the first delivery pipe is positioned between the aqueous medium input port and the 3rd valve (16) of heat exchanger (14), and the first delivery pipe is provided with the first drain valve (15); Be connected to the second delivery pipe on the output water pipe (19), the input of the second delivery pipe is positioned between the aqueous medium delivery outlet and the 4th valve (21) of heat exchanger (14), and the second delivery pipe is provided with the second drain valve (20).
5. the method recycled for the second time of flue gas waste heat of continuous annealing furnace according to claim 1, it is characterized in that: the bottom of described storage tank (2) is connected with the input of the 3rd delivery pipe (22), the output of the 3rd delivery pipe (22) ditch of running in, the 3rd delivery pipe (22) is provided with the 5th valve (23), and the 5th valve (23) is near storage tank (2); The overfall of storage tank (2) connects the input of overflow pipe (24), and the output of overflow pipe (24) is connected with the 3rd delivery pipe (22).
CN2010106089364A 2010-12-28 2010-12-28 Method for secondarily recycling smoke gas waste heat of continuous annealing furnace Expired - Fee Related CN102012169B (en)

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CN102589308A (en) * 2012-03-15 2012-07-18 机械工业第六设计研究院有限公司 Waste heat recycling system of industrial furnaces
KR102095663B1 (en) * 2016-08-19 2020-03-31 프리메탈스 테크놀로지스 재팬 가부시키가이샤 Continuous annealing equipment
CN110172565B (en) * 2018-06-28 2021-02-09 镕凝精工新材料科技(上海)有限公司 Waste heat recycling system of cover-type annealing furnace
CN109972154A (en) * 2019-03-28 2019-07-05 浙江沪新不锈钢制造有限公司 A kind of processing of pickling steel pipe hot-tub and treatment process

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