CN201933121U - Secondary recycling system for flue gas waste heat of continuous annealing furnace - Google Patents
Secondary recycling system for flue gas waste heat of continuous annealing furnace Download PDFInfo
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- CN201933121U CN201933121U CN2010206841402U CN201020684140U CN201933121U CN 201933121 U CN201933121 U CN 201933121U CN 2010206841402 U CN2010206841402 U CN 2010206841402U CN 201020684140 U CN201020684140 U CN 201020684140U CN 201933121 U CN201933121 U CN 201933121U
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The utility model relates to a secondary recycling system for flue gas waste heat of a continuous annealing furnace, which is characterized by comprising a cooling water return pipe, a water storage tank, a fresh water supplement pipe, a solenoid valve, a liquid level sensor, a first input conduit, a first check valve, a first water pump, a first valve, a heat exchanger, a third valve, an output conduit, a fourth valve, a flue gas input pipe and a flue gas output pipe, wherein the output end of the first input conduit is communicated with a water medium input port of the heat exchanger; the input end of the outlet conduit is communicated with a water medium output port of the heat exchanger; the output end of the outlet conduit is communicated with a hot water rinse tank for a rinsing section; the input end of the flue gas input pipe is connected with low-temperature flue gas after first recycling of flue gas waste heat of the continuous annealing furnace; the output end of the flue gas input pipe is communicated with a flue gas medium input port of the heat exchanger; and a flue gas medium output port of the heat exchanger is connected with the flue gas output pipe. The system can save not only save heat energy and amounts of cooling water.
Description
Technical field
The utility model relates to a kind of continuous annealing furnace flue gas exhaust heat recycling system for the second time, belongs 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 interchanger, annealing furnace combustion exhaust flue-gas temperature has dropped to about 400 ℃, because heat content is lower, handle at present " low-temperature flue gas " most way to be to mix a certain proportion of freezing air in flue gas, directly discharging after its temperature reduced to about 250 ℃ that satisfy the blower fan requirement, waste a large amount of heat energy so virtually, also increased the load of smoke exhaust fan simultaneously.
For the radiation tubular oven, it is carrier with " superheated water " that employing is also arranged, and to the about 400 ℃ of modes that left and right sides fume afterheat reclaims once more after the heat recovery, other operations of unit such as users such as cleaning section, warm air drying section provide thermal source in order to anneal.
But this waste heat secondary recovery utilize mode because of " superheated water " pressure medium up to 0.5～0.7Mpa, therefore total system is comparatively complicated, control accuracy is had relatively high expectations, and equipment such as interchanger, expansion drum need professional pressurized vessel producer to make, and the total system investment is higher.This system seldom uses at the NOF fired heater in addition, because cause the fluctuation of NOF furnace pressure easily in regulate process.
Summary of the invention
" low-temperature flue gas " after recycling for the first time at the continuous annealing furnace flue gas exhaust heat, the purpose of this utility model are to provide a kind of continuous annealing furnace flue gas exhaust heat recycling system for the second time, and this system can not only save heat energy, also saves a large amount of water coolants.
For achieving the above object, technical solution adopted in the utility model is: the continuous annealing furnace flue gas exhaust heat is recycling system for the second time, it is characterized in that: it comprises and cools back water pipe, water tank, the new water pipe of benefit, magnetic valve, liquid level sensor, the first input water pipe, first vacuum breaker, first water pump, first valve, interchanger, the 3rd valve, output water pipe, the 4th valve, flue gas input tube, flue gas output tube; The input termination that cools back water pipe is carried out cooled cooling backwater to the annealing furnace water cooled rolls, the output terminal that cools back water pipe is connected with water tank, mend the input termination make up water source of new water pipe, the output terminal of mending new water pipe is connected with water tank, mend new water pipe and be provided with magnetic valve, water tank is provided with liquid level sensor; The input terminus of the first input water pipe is connected with water tank, the output terminal of the first input water pipe is connected with the water medium input aperture of interchanger, be provided with first valve, first water pump, first vacuum breaker, the 3rd valve successively on the first input water pipe, first valve is near water tank, and the 3rd valve is near interchanger; The input terminus of output water pipe is connected with the water medium delivery port of interchanger, and the output terminal of output water pipe is connected with the hot water rinse bath that is used for the cleaning section use, and the output water pipe is provided with the 4th valve, and the 4th valve is near interchanger; Low-temperature flue gas after the continuous in succession annealing furnace fume afterheat of the input terminus of flue gas input tube is recycled for the first time, the output terminal of flue gas input tube is connected with the flue gas medium input aperture of interchanger, and the flue gas medium delivery port of interchanger connects a flue gas output tube.
The input terminus of described first valve one second input water pipe in parallel with the output terminal of first vacuum breaker is provided with second valve, second water pump, second vacuum breaker on the second input water pipe successively, and second valve is near water tank.
The described first input water pipe is connected a bypass pipe with exporting between the water pipe, and bypass pipe is provided with by-pass valve.
Be connected to first delivery pipe on the described first input water pipe, the input terminus of first delivery pipe is between the water medium input aperture and the 3rd valve of interchanger, and first delivery pipe is provided with first bleed valve; Be connected to second delivery pipe on the output water pipe, the input terminus of second delivery pipe is between the water medium delivery port and the 4th valve of interchanger, and second delivery pipe is provided with second bleed valve.
The bottom of described water tank is connected with the input terminus of the 3rd delivery pipe, the output terminal of the 3rd delivery pipe ditch of running in, and the 3rd delivery pipe is provided with the 5th valve, and the 5th valve is near water tank; The overflow port of water tank connects the input terminus of upflow tube, and the output terminal of upflow tube is connected with the 3rd delivery pipe.
The beneficial effects of the utility model are:
1) this system is a medium the annealing furnace water cooled rolls is carried out cooled cooling backwater (" hot water "), 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 interchanger, all be fully utilized again, not only save heat energy, also save a large amount of water coolants (cleaning section), kill two birds with one stone.
2) carry out waste heat recovery by this system and need not regulate flue gas flow, can not cause fluctuation, so this method can be applicable to the flue gas waste heat recovery of NOF fired heater the fume exhaust system furnace pressure.
3) this system is with flue gas and the required water direct heat-exchange of cleaning section user, and than the few one-level heat-exchange system of superheated water waste heat recovery mode, so heat exchange efficiency is higher, and thermosteresis is lower.
4) interchanger 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, improves the guarantee that cleaning section supplies water greatly.
System of the present utility model except that using, also can be widely used in other flue gas waste heat recovery as power industry in continuous annealing furnace.
Description of drawings
Fig. 1 is the continuous annealing furnace flue gas exhaust heat structural representation of recycling system for the second time.
Among the figure: 1-cools back water pipe, and 2-water tank, 3-are mended new water pipe, the 4-magnetic valve, 5-liquid level sensor, the 6-first input water pipe, 7-first vacuum breaker, 8-first water pump, 9-first valve, the 10-second input water pipe, 11-second vacuum breaker, 12-second water pump, 13-second valve, 14-interchanger, 15-first bleed valve, 16-the 3rd valve, 17-bypass pipe, 18-by-pass valve, 19-exports water pipe, 20-second bleed valve, 21-the 4th valve, 22-the 3rd delivery pipe, 23-the 5th valve, 24-upflow tube, 25-flue gas input tube, 26-flue gas output tube, 27-hot water rinse bath.
Embodiment
As shown in Figure 1, the continuous annealing furnace flue gas exhaust heat is recycling system for the second time, and it comprises and cools back water pipe 1, water tank 2, mend new water pipe 3, magnetic valve 4, liquid level sensor 5, the first input water pipe 6, first vacuum breaker 7, first water pump 8, first valve 9, the second input water pipe 10, second vacuum breaker 11, second water pump 12, second valve 13, interchanger 14, first delivery pipe, first bleed valve 15, the 3rd valve 16, bypass pipe 17, by-pass valve 18, output water pipe 19, second delivery pipe, second bleed valve 20, the 4th valve 21, the 3rd delivery pipe 22, the 5th valve 23, upflow tube 24, flue gas input tube 25, flue gas output tube 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 terminal that cools back water pipe 1 is connected with water tank 2, mend the input termination make up water source of new water pipe 3, the output terminal of mending new water pipe 3 is connected with water tank 2, mend new water pipe 3 and be provided with magnetic valve 4, water tank 2 is provided with liquid level sensor 5; The input terminus of the first input water pipe 6 is connected with water tank 2, the output terminal of the first input water pipe 6 is connected with the water medium input aperture of interchanger 14, be provided with first valve 9, first water pump 8, first vacuum breaker 7, the 3rd valve 16 successively on the first input water pipe 6, first valve 9 is near water tank 2, the three valves 16 close interchanger 14; The input terminus of output water pipe 19 is connected with the water medium delivery port of interchanger 14, and the output terminal 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 interchanger 14; Low-temperature flue gas after the continuous in succession annealing furnace fume afterheat of the input terminus of flue gas input tube 25 is recycled for the first time, the output terminal of flue gas input tube 25 is connected with the flue gas medium input aperture of interchanger 14, and the flue gas medium delivery port of interchanger 14 connects a flue gas output tube 27.
Be provided with second valve 13, second water pump 12, second vacuum breaker, 11, the second valves 13 on the input terminus of described first valve 9 one second input water pipe in parallel 10, the second input water pipes 10 successively near water tank 2 with the output terminal of first vacuum breaker 7.
The described 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-pass valve 18.
Be connected to first delivery pipe on the described first input water pipe 6, the input terminus of first delivery pipe is between the water medium input aperture and the 3rd valve 16 of interchanger 14, and first delivery pipe is provided with first bleed valve 15; Be connected to second delivery pipe on the output water pipe 19, the input terminus of second delivery pipe is between the water medium delivery port and the 4th valve 21 of interchanger 14, and second delivery pipe is provided with second bleed valve 20.
The bottom of described water tank 2 is connected with the input terminus of the 3rd delivery pipe 22, the output terminal 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 water tanks 2; The overflow port of water tank 2 connects the input terminus of upflow tube 24, and the output terminal of upflow tube 24 is connected with the 3rd delivery pipe 22.
Interchanger adopts the band fin-tube heat exchanger.
The method that the continuous annealing furnace flue gas exhaust heat is recycled for the second time: the low-temperature flue gas after the continuous annealing furnace flue gas exhaust heat recycled for the first time by the second time recycling system interchanger 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, described cooling backwater carries out the heat exchange back (being heated to 60 ℃ or higher) of heating up through interchanger and sends into cleaning section and use.
The temperature of described low-temperature flue gas is 380～420 ℃.
The water side:
Cooling backwater (is that water coolant cools off the annealing furnace water cooled rolls from the waste water of NOF water cooled rolls discharging mainly, the backwater that is produced, or title waste water), about 50 ℃ of this portion water temperature, because of not satisfying working conditions directly discharging usually, now be recycled to the water source of water tank 2 as this residual neat recovering system by cooling back water pipe 1; Water 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 water tank, magnetic valve 4 is opened automatically and is replenished new water when water tank 2 liquid levels are lower than the low level set(ting)value, closes magnetic valve until the water level set(ting)value that attains to a high place; Water tank 2 also designs overflow device (upflow tube), can directly unnecessary water be drained into the waste effluent flume by overflow device when water cooled rolls discharge water flow is big.
By first water pump 8 (or second water pump 12, standby) water of water tank 2 is squeezed into interchanger 14, water pump is that the using and the reserved are arranged, after cooling backwater enters interchanger 14, by interchanger its temperature is risen to 60 ℃; The import and export of interchanger 14 water sides respectively are provided with 1 cover thermopair and are used to detect water temperature, are provided with 1 pressure switch at interchanger water side outlet simultaneously, report to the police when detecting pressure anomaly, and whether this pressure switch mainly detects interchanger and leak.
Cause a hidden trouble just in case take place to reveal in order to prevent the water in the Tube Sheet of Heat Exchanger, in the import and export of interchanger 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 interchanger, can discharge the water in the Tube Sheet of Heat Exchanger simultaneously.
Fume side:
Low-temperature flue gas (400 ℃ of flue gases) enters interchanger (5) with after the water heating, flue-gas temperature is reduced 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 working cost also decreases.The interchanger smoke entrance is respectively established a cover thermopair, is used to detect the smoke entrance temperature.
Claims (5)
1. continuous annealing furnace flue gas exhaust heat recycling system for the second time is characterized in that: described second time recycling system comprise cool back water pipe (1), water tank (2), mend new water pipe (3), magnetic valve (4), liquid level sensor (5), the first input water pipe (6), first vacuum breaker (7), first water pump (8), first valve (9), interchanger (14), the 3rd valve (16), output water pipe (19), the 4th valve (21), flue gas input tube (25), flue gas output tube (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 terminal that cools back water pipe (1) is connected with water tank (2), mend the input termination make up water source of new water pipe (3), the output terminal of mending new water pipe (3) is connected with water tank (2), mend new water pipe (3) and be provided with magnetic valve (4), water tank (2) is provided with liquid level sensor (5); The input terminus of the first input water pipe (6) is connected with water tank (2), the output terminal of the first input water pipe (6) is connected with the water medium input aperture of interchanger (14), be provided with first valve (9), first water pump (8), first vacuum breaker (7), the 3rd valve (16) successively on the first input water pipe (6), first valve (9) is near water tank (2), and the 3rd valve (16) is near interchanger (14); The input terminus of output water pipe (19) is connected with the water medium delivery port of interchanger (14), the output terminal 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 interchanger (14); Low-temperature flue gas after the continuous in succession annealing furnace fume afterheat of the input terminus of flue gas input tube (25) is recycled for the first time, the output terminal of flue gas input tube (25) is connected with the flue gas medium input aperture of interchanger (14), and the flue gas medium delivery port of interchanger (14) connects a flue gas output tube (27).
2. continuous annealing furnace flue gas exhaust heat according to claim 1 is recycling system for the second time, it is characterized in that: the input terminus of described first valve (9) one second input water pipe (10) in parallel with the output terminal of first vacuum breaker (7), be provided with second valve (13), second water pump (12), second vacuum breaker (11) successively on the second input water pipe (10), second valve (13) is near water tank (2).
3. continuous annealing furnace flue gas exhaust heat according to claim 1 is recycling system for the second time, it is characterized in that: the described 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-pass valve (18).
4. continuous annealing furnace flue gas exhaust heat according to claim 1 is recycling system for the second time, it is characterized in that: be connected to first delivery pipe on the described first input water pipe (6), the input terminus of first delivery pipe is positioned between the water medium input aperture and the 3rd valve (16) of interchanger (14), and first delivery pipe is provided with first bleed valve (15); Be connected to second delivery pipe on the output water pipe (19), the input terminus of second delivery pipe is positioned between the water medium delivery port and the 4th valve (21) of interchanger (14), and second delivery pipe is provided with second bleed valve (20).
5. continuous annealing furnace flue gas exhaust heat according to claim 1 is recycling system for the second time, it is characterized in that: the bottom of described water tank (2) is connected with the input terminus of the 3rd delivery pipe (22), the output terminal 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 water tank (2); The overflow port of water tank (2) connects the input terminus of upflow tube (24), and the output terminal of upflow tube (24) is connected with the 3rd delivery pipe (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206841402U CN201933121U (en) | 2010-12-28 | 2010-12-28 | Secondary recycling system for flue gas waste heat of continuous annealing furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206841402U CN201933121U (en) | 2010-12-28 | 2010-12-28 | Secondary recycling system for flue gas waste heat of continuous annealing furnace |
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| Publication Number | Publication Date |
|---|---|
| CN201933121U true CN201933121U (en) | 2011-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206841402U Expired - Fee Related CN201933121U (en) | 2010-12-28 | 2010-12-28 | Secondary recycling system for flue gas waste heat of continuous annealing furnace |
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| Country | Link |
|---|---|
| CN (1) | CN201933121U (en) |
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2010
- 2010-12-28 CN CN2010206841402U patent/CN201933121U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110817 Termination date: 20141228 |
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| EXPY | Termination of patent right or utility model |