CN216838084U - Continuous annealing stove shrend waste heat recovery utilizes device - Google Patents
Continuous annealing stove shrend waste heat recovery utilizes device Download PDFInfo
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- CN216838084U CN216838084U CN202122861931.9U CN202122861931U CN216838084U CN 216838084 U CN216838084 U CN 216838084U CN 202122861931 U CN202122861931 U CN 202122861931U CN 216838084 U CN216838084 U CN 216838084U
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Abstract
The utility model relates to a water quenching waste heat recycling device for a continuous annealing furnace, and belongs to the technical field of continuous annealing energy conservation in the metallurgical industry. The technical scheme is as follows: the water quenching tank is divided into a water quenching 1# tank and a water quenching 2# tank, a desalted water replenishing valve, a drain valve, a liquid level meter and a thermometer are respectively arranged on the water quenching 1# tank and the water quenching 2# tank, and a nitrogen injection valve and a pressure gauge are arranged on a sealing groove; the high-temperature strip steel is driven by a water quenching roller to sequentially pass through a water quenching No. 1 groove, a sealing groove and a water quenching No. 2 groove for cooling; the water quenching tank No. 1 and the water quenching tank No. 2 are connected with a water/water heat exchanger through a circulating pump, and hot water generated by the water quenching tank No. 1 is connected with an acid liquor tank of an acid rolling line through a hot water pipe. The utility model has the beneficial effects that: the method can recycle the water quenching waste heat of the continuous annealing furnace and reduce the consumption of superheated steam in the pickling section of the acid rolling line.
Description
Technical Field
The utility model relates to a water quenching waste heat recycling device of a continuous annealing furnace, belonging to the technical field of continuous annealing energy conservation in the metallurgical industry.
Background
The continuous annealing production process is to heat and cool the cold-rolled strip steel to eliminate work hardening and obtain corresponding material performance. Wherein the continuous annealing furnace is an important process device for production line processing. Before the cold-rolled strip steel enters the outside after the whole annealing process is completed through heating and cooling in the continuous annealing furnace, the cold-rolled strip steel needs to enter a water quenching section to completely cool the strip steel, so that the oxidation of the strip steel with the outside air due to overhigh temperature after the strip steel is discharged from the furnace is avoided. In general, the temperature of the strip passing through the annealing furnace and entering the water quenching section is 150 ℃ to 200 ℃, and the cooling water in the water quenching section cools the strip to below 60 ℃. And then the strip steel is squeezed by a squeezing roller and a dryer to remove water stains on the surface of the strip steel. The water quenching process is mainly carried out in a water quenching tank, and the cooling water in direct contact with the strip steel is desalted water. The desalted water is circulated by a circulating pump, and the circulating water is cooled by a water/water heat exchanger and then is injected into the tank again, so that the cyclic utilization is realized. The temperature of the desalted water in the water quenching tank is ensured to be maintained below 60 ℃.
During the production of the continuous annealing furnace, the temperature of the strip steel entering the water quenching section is 150-200 ℃, the hourly output is 80-150 t/h, 50-80 t of desalted water can be stored in the water quenching tank to cool the strip steel in order to meet the high-load production requirement, and the strip steel is ensured to be reduced to below 60 ℃. The flow of the circulating water is about 180m3/t--230 m3T, water quenching waste heat is not recoveredAnd (4) utilizing. And the steel-carrying waste heat in the water quenching tank is completely taken out by circulating water cooling and then enters a water treatment plant for cooling treatment. And the waste heat is useless, so that the energy is greatly wasted.
At present, a cold rolling plant with relatively complete functions generally has deep processing production lines such as an acid rolling line and a continuous annealing line, wherein the acid rolling line processes a hot-rolled coil into a cold-hard coil through an acid cleaning and rolling mill, and the continuous annealing line processes the cold-hard coil into a cold-rolled plate through an annealing furnace annealing process for a client to use. The acid washing section of the acid rolling line is to remove the iron scale on the surface of the strip steel by using dilute hydrochloric acid at the temperature of 80 ℃, and the dilute hydrochloric acid is prepared by desalted water and high-concentration hydrochloric acid in proportion. And the waste acid after acid washing is regenerated into new acid through a roasting furnace of an acid regeneration line for recycling in a production line. In general, 30-50 t of desalted water is consumed in the pickling section per hour, superheated steam is used for heating acid liquor in the pickling section, and a large amount of superheated steam is consumed in the production period.
Energy consumption analysis of a cold rolling plant shows that water quenching waste heat of a continuous annealing line is not utilized and is wasted, and an acid pickling section of an acid rolling line needs to consume superheated steam to heat acid liquor to keep the temperature of the acid liquor at 80 ℃ according to production process requirements, so that a large amount of energy is consumed. Especially for the factory that generates superheated steam, etc. that the cold rolling factory overall arrangement position is far away from the steam power plant, cause the energy loss along the way to be bigger. Is not beneficial to energy conservation and consumption reduction of industrial production.
Patent CN201010186155.0 discloses a desalted water recycling method for annealing furnace water quenching circulation system, which recycles desalted water of annealing furnace water quenching circulation system, collects overflowed desalted water from water quenching tank, and then delivers the collected desalted water to cleaning section by water pump, and supplements water amount lost by desalted water in cleaning section. The patent relates to collecting desalted water of a water quenching tank, and the aim of the patent is mainly to save the desalted water. And waste heat recovery and utilization generated by water quenching are not involved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a water quenching waste heat recycling device of a continuous annealing furnace, which can recycle the water quenching waste heat of the continuous annealing furnace, reduce the consumption of superheated steam in an acid washing section of an acid rolling line and solve the problems in the background technology.
The technical scheme of the utility model is as follows:
a continuous annealing furnace water quenching waste heat recycling device comprises a water quenching tank, a sealing groove, a water quenching roller, a circulating pump, a water/water heat exchanger and an acid rolling line acid liquid tank, wherein the water quenching tank is divided into a water quenching 1# tank and a water quenching 2# tank, the sealing groove is respectively connected with the water quenching 1# tank and the water quenching 2# tank, a desalted water replenishing valve, a drain valve, a liquid level meter and a thermometer are respectively arranged on the water quenching 1# tank and the water quenching 2# tank, and a nitrogen injection valve and a pressure meter are arranged on the sealing groove; the high-temperature strip steel is driven by a water quenching roller to sequentially pass through a water quenching No. 1 groove, a sealing groove and a water quenching No. 2 groove for cooling; the water quenching 1# tank and the water quenching 2# tank are connected with a water/water heat exchanger through a circulating pump, and a desalted water outlet after heat exchange of the water/water heat exchanger is respectively connected with the water quenching 1# tank and the water quenching 2# tank through pipelines; hot water generated by the water quenching 1# groove is connected with an acid liquor tank of the acid rolling line through a hot water pipe, and a stop valve, a thermometer, a water pump and a check valve are arranged on a pipeline between the water quenching 1# groove and the acid liquor tank of the acid rolling line.
The water quenching 1# groove and the water quenching 2# groove are respectively connected with a water quenching drainage pipe, and a drainage valve is arranged on the water quenching drainage pipe.
And flow regulating valves are respectively arranged between the water quenching tank 1# and the circulating pump and between the water/water heat exchanger and the water quenching tank 1 #.
And stop valves are respectively arranged on pipelines connecting a desalted water outlet after heat exchange of the water/water heat exchanger with the water quenching tank No. 1 and the water quenching tank No. 2.
The utility model has the beneficial effects that: the method can recycle the water quenching waste heat of the continuous annealing furnace, reduce the consumption of superheated steam in the pickling section of the acid rolling line and save energy.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: 1. high-temperature strip steel, 2, water quenching No. 1 groove, 3, water quenching No. 2 groove, 4, water quenching sealing groove, 5, water quenching roller, 6, liquid level meter, 7, thermometer, 8, water quenching drainage pipe, 9, water quenching No. 1 groove drainage valve, 10, water quenching No. 2 groove drainage valve, 11, water quenching No. 1 groove stop valve, 12, water quenching No. 2 groove stop valve, 13, water quenching groove net circulation inlet pipe, 14, filter, 15, circulating pump, 16, water/water heat exchanger, 17, circulating water inlet pipe, 18, circulating water outlet pipe, 19, water quenching groove net circulation outlet pipe, 20, water quenching No. 1 groove net circulation outlet pipe stop valve, 21, water quenching No. 2 groove net circulation outlet pipe, 22, 23, hot water pipe stop valve, 24, hot water pipe filter, 25, hot water pipe thermometer, 26, water pump, 27, hot water pipe check valve, 28, acid rolling line acid liquid tank, 29, water quenching No. 2 groove, 23, water quenching water cooling pipe, 23, hot water pipe stop valve, hot water pipe filter, 25, hot water pipe filter, hot water pump, hot water tank, 28, water tank, A nitrogen injection regulating valve 30, a pressure gauge 31, a water quenching 1# groove water replenishing valve 32, a water quenching 2# groove water replenishing valve 33 and a water replenishing pipe.
Detailed Description
The utility model is further illustrated by way of example in the following description with reference to the accompanying drawings.
Referring to the attached drawing 1, the water quenching waste heat recycling device of the continuous annealing furnace comprises a water quenching tank, a sealing groove 4, a water quenching roller 5, a circulating pump 15, a water/water heat exchanger 16 and an acid rolling line acid liquid tank 28, wherein the water quenching tank is divided into a water quenching 1# tank 2 and a water quenching 2# tank 3, the sealing groove 4 is respectively connected with the water quenching 1# tank 2 and the water quenching 2# tank 3, a desalted water replenishing valve, a drain valve, a liquid level meter and a thermometer are respectively arranged on the water quenching 1# tank 2 and the water quenching 2# tank 3, and a nitrogen injection valve and a pressure meter are arranged on the sealing groove 4; the high-temperature strip steel is driven by a water quenching roller 5 to sequentially pass through a water quenching No. 1 groove 2, a sealing groove 4 and a water quenching No. 2 groove 3 for cooling; the water quenching tank No. 1 2 and the water quenching tank No. 2 3 are connected with a water/water heat exchanger 16 through a circulating pump 15, and a desalted water outlet after heat exchange of the water/water heat exchanger 16 is respectively connected with the water quenching tank No. 1 2 and the water quenching tank No. 2 3 through pipelines; hot water generated in the water quenching 1# groove 2 is connected with the acid solution tank 28 of the acid rolling line through a hot water pipe, and a stop valve, a thermometer, a water pump and a check valve are arranged on a pipeline between the water quenching 1# groove 2 and the acid solution tank 28 of the acid rolling line.
In this embodiment, referring to fig. 1, a high-temperature strip 1 is driven by a water quenching roller 5, and the cooling process is performed sequentially through a water quenching tank # 1 2, a sealing tank # 4 and a water quenching tank # 2 3. And a liquid level meter 6 and a thermometer 7 are respectively arranged in the water quenching tank No. 1 and the water quenching tank No. 2 and are used for detecting the liquid level and the water temperature in the tank. And the water quenching drainage pipe 8 is respectively connected with the water quenching 1# groove 2 and the water quenching 2# groove 3 through a water quenching 1# groove drainage valve 9 and a water quenching 2# groove drainage valve 10 and is used for sewage discharge and liquid level control of the water quenching system. And a water quenching water replenishing pipe 33 is respectively connected with the water quenching 1# groove 2 and the water quenching 2# groove 3 through a water quenching 1# groove water replenishing valve 31 and a water quenching 2# groove water draining valve 32 to replenish water for the water quenching system.
The water quenching tank clean circulation water inlet pipeline 13 is connected with the water quenching 1# groove 2 through the water quenching 1# groove stop valve 11, and the water quenching tank clean circulation water inlet pipeline 13 is connected with the water quenching 2# groove 3 through the water quenching 2# groove stop valve 23. The water quench tank clean cycle feed line 13 is connected to a water/water heat exchanger 16 via a filter 14 and a circulation pump 15. The water/water heat exchanger 16 is connected with a water quenching tank clean circulation water outlet pipe 19. The water quenching tank clean circulation water outlet pipe 19 passes through the water quenching tank clean circulation water outlet pipe stop valve 20 and is connected with the water quenching tank 1# 2, and the water quenching tank clean circulation water outlet pipe 19 is connected with the water quenching tank 2# 3 through the water quenching tank stop valve 21.
The water quenching tank 1# 2 is connected with an acid liquor tank 28 of an acid rolling line through a hot water pipe 22, the hot water pipe 22 is provided with a hot water pipe stop valve 23, a hot water pipe filter 24 and a water pump 26, and the temperature is measured through a hot water pipe thermometer 25.
The sealing groove 4 is respectively connected with the water quenching 1# groove 2 and the water quenching 2# groove 3, and the joint of the sealing groove 4 and the water quenching 1# groove 2 and the joint of the sealing groove 4 and the water quenching 2# groove 3 are respectively positioned below the liquid levels of the water quenching 1# groove 2 and the water quenching 2# groove 3.
The sealing groove 4 is filled with high-purity nitrogen gas, and a nitrogen gas injection regulating valve 29 and a pressure gauge 30 are arranged, wherein the pressure gauge 30 is used for detecting the pressure in the sealing groove. The nitrogen injection regulating valve 29 controls the flow rate of injected nitrogen. The high-temperature strip steel 1 is ensured not to be oxidized in the sealing groove 4.
The hot water pipe 22 is wrapped with an insulating material. A hot water pipe check valve 27 is installed between the water pump 26 and the pickle liquor tank 28 to prevent hot water from flowing back.
The specific working principle is as follows:
1. when there is no need to make hot water:
(1) the strip steel is driven by a water quenching roller 5 and sequentially enters a water quenching No. 1 groove 2, a sealing groove 4 and a water quenching No. 2 groove 3 for cooling; the drain valve of the water quenching tank is kept closed, and the clean circulating water inlet stop valve and the clean circulating water outlet stop valve are kept in an open state. The hot water pipe stop valve keeps a closed state. The circulating pump respectively pumps desalted water from the No. 1 tank 2 and the No. 2 tank 3 of the water quenching, and the desalted water is injected into the water quenching tank again after heat exchange is carried out by the water/water heat exchanger 16.
(2) According to the detection of the liquid level meter, a water quenching 1# groove water replenishing valve or a 2# groove water replenishing valve is opened when the liquid level is low, and water is replenished to the groove body.
(3) When the water quality is reduced, the water is drained and changed through the drain valve, and the water quality is kept to meet the technological requirements.
(4) High-purity nitrogen gas lets in the seal groove through the governing valve, by pressure gauge detection pressure, ensures that the seal groove internal pressure is the pressure in a little positive.
2. When hot water is required to be generated for use in the pickling section:
(1) the strip steel is driven by a water quenching roller 5 and sequentially enters a water quenching No. 1 groove 2, a sealing groove 4 and a water quenching No. 2 groove 3 for cooling; and the drain valve of the water quenching tank is kept closed, and the clean circulating water inlet stop valve and the clean circulating water outlet stop valve which are communicated with the water quenching tank No. 1 are closed.
(2) Opening a drain valve of the water quenching 1# tank, and draining water at the bottom of the tank: the water replenishing valve keeps a closed state. The liquid level meter detects the liquid level of the water quenching tank No. 1 and reduces the liquid level to 2/3 of the height of the tank body. And closing the drainage valve of the water quenching tank No. 1. And simultaneously opening a water replenishing valve of the water quenching tank No. 2 to replenish the liquid level of the water quenching tank to the position of 3/4.
(3) Detecting the water temperature of the water quenching tank 1 by using a thermometer, and continuously increasing the water temperature of the water quenching tank 1 to 90-100 ℃;
(4) and opening a stop valve of the hot water pipe, starting a water pump, and starting to supply hot water to the pickling bath for acid rolling.
(5) And opening a water replenishing valve of the water quenching tank No. 1, and replenishing water to the tank No. 1. The liquid level of the water quenching No. 1 tank is kept between 1/2 and 2/3. And keeping the water temperature of the water quenching No. 1 tank to fluctuate between 85 and 100 ℃.
(6) And pumping desalted water from the No. 2 tank by a circulating pump, exchanging heat by a water/water heat exchanger, and then re-injecting the desalted water into the No. 2 water quenching tank, and keeping the water temperature of the No. 2 water quenching tank below 60 ℃.
(7) And after the hot water of the pickling tank is supplemented, closing the hot water pipe water pump and closing the hot water pipe stop valve.
(8) The liquid levels of the two tanks of the water quenching tank are restored to normal liquid levels through a water supplementing valve and a water draining valve of the water quenching tank. And opening the water quenching 1# tank clean circulating water inlet stop valve and the water return stop valve, starting circulating heat exchange, and recovering the water quenching tank system to a mode without manufacturing hot water.
Claims (4)
1. The utility model provides a continuous annealing stove shrend waste heat recovery utilizes device which characterized in that: the acid-rolling line acid liquid tank comprises a water quenching tank, a sealing groove (4), a water quenching roller (5), a circulating pump (15), a water/water heat exchanger (16) and an acid-rolling line acid liquid tank (28), wherein the water quenching tank is divided into a water quenching 1# tank (2) and a water quenching 2# tank (3), the sealing groove (4) is respectively connected with the water quenching 1# tank (2) and the water quenching 2# tank (3), a desalted water replenishing valve, a drain valve, a liquid level meter and a thermometer are respectively installed on the water quenching 1# tank (2) and the water quenching 2# tank (3), and a nitrogen injection valve and a pressure meter are installed on the sealing groove (4); the high-temperature strip steel is driven by a water quenching roller (5) to sequentially pass through a water quenching No. 1 groove (2), a sealing groove (4) and a water quenching No. 2 groove (3) for cooling; the water quenching No. 1 tank (2) and the water quenching No. 2 tank (3) are connected with a water/water heat exchanger (16) through a circulating pump (15), and a desalted water outlet after heat exchange of the water/water heat exchanger (16) is respectively connected with the water quenching No. 1 tank (2) and the water quenching No. 2 tank (3) through pipelines; hot water generated by the water quenching No. 1 groove (2) is connected with an acid liquor tank (28) of an acid rolling line through a hot water pipe, and a stop valve, a thermometer, a water pump and a check valve are arranged on a pipeline between the water quenching No. 1 groove (2) and the acid liquor tank (28) of the acid rolling line.
2. The continuous annealing furnace water quenching waste heat recycling device of claim 1, characterized in that: the water quenching 1# groove (2) and the water quenching 2# groove (3) are respectively connected with a water quenching drainage pipe (8), and a drainage valve is arranged on the water quenching drainage pipe (8).
3. The continuous annealing furnace water quenching waste heat recycling device of claim 1, characterized in that: flow regulating valves are respectively arranged between the water quenching tank 1 (2) and the circulating pump (15) and between the water/water heat exchanger (16) and the water quenching tank 1 (2).
4. The continuous annealing furnace water quenching waste heat recycling device of claim 1, characterized in that: and stop valves are respectively arranged on pipelines connecting the desalted water outlet after heat exchange of the water/water heat exchanger (16) with the water quenching tank No. 1 (2) and the water quenching tank No. 2 (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122861931.9U CN216838084U (en) | 2021-11-19 | 2021-11-19 | Continuous annealing stove shrend waste heat recovery utilizes device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122861931.9U CN216838084U (en) | 2021-11-19 | 2021-11-19 | Continuous annealing stove shrend waste heat recovery utilizes device |
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| Publication Number | Publication Date |
|---|---|
| CN216838084U true CN216838084U (en) | 2022-06-28 |
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| CN202122861931.9U Active CN216838084U (en) | 2021-11-19 | 2021-11-19 | Continuous annealing stove shrend waste heat recovery utilizes device |
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- 2021-11-19 CN CN202122861931.9U patent/CN216838084U/en active Active
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