CN216738550U - Waste heat utilization system of hot rolling continuous pickling line - Google Patents
Waste heat utilization system of hot rolling continuous pickling line Download PDFInfo
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- CN216738550U CN216738550U CN202122719913.7U CN202122719913U CN216738550U CN 216738550 U CN216738550 U CN 216738550U CN 202122719913 U CN202122719913 U CN 202122719913U CN 216738550 U CN216738550 U CN 216738550U
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Abstract
The utility model discloses a waste heat utilization system of a hot rolling continuous pickling unit, which belongs to the technical field of hot rolling and comprises an acid liquor tank, a pickling tank and a condensed water tank, wherein a steam heat exchanger is arranged on the acid liquor tank, the outlet end of the steam heat exchanger is connected with the condensed water tank, a coil heat exchanger is also arranged between the steam heat exchanger and the condensed water tank and is positioned at the bottom of the pickling tank, the inlet of the coil heat exchanger is connected with the outlet of a steam heat exchange coil, and the outlet of the coil heat exchanger is connected with the condensed water tank. According to the utility model, the coil heat exchanger is arranged at the bottom of the pickling tank, and the steam condensate water in the steam heat exchanger on the acid liquor tank can be used for heating the acid liquor in the pickling tank, so that the acid return temperature of the pickling tank is increased, the steam consumption of the acid liquor tank is reduced, the energy is saved, and the requirements of energy conservation and emission reduction are met.
Description
Technical Field
The utility model relates to the technical field of hot rolling, in particular to a waste heat utilization system of a hot rolling continuous pickling line.
Background
The pickling is a production process for washing away oxide skins on the surface of the hot-rolled strip steel by acid liquor to meet the rolling requirements of a cold rolling mill, such as common production processes of continuous hydrochloric acid pickling of the hot-rolled strip steel, continuous mixed acid pickling of the hot-rolled stainless strip steel, soaking and pickling of the hot-rolled steel plate and the like. Generally, an acid pickling unit for hot-rolled metal strips passes through firstly heating acid liquor to a process temperature by adopting steam or other heating media through a graphite heat exchanger or other modes, then pumping the acid liquor into an acid pickling tank for acid pickling of the hot-rolled metal strips, enabling the used acid liquor to flow back to an acid liquor tank for reheating, circulating the acid liquor to the acid pickling tank, and directly discharging condensed water formed by the steam after heat exchange out. Because the steam condensate water after heat exchange has the temperature of about 90-100 ℃, the loss of directly discharged heat is large, and the requirements of energy conservation and emission reduction are not met.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of large heat loss and the like of the existing pickling line, the utility model aims to solve the technical problems that: the waste heat utilization system of the hot rolling continuous pickling line can effectively utilize waste heat of steam condensate water and reduce steam consumption.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
hot rolling continuous pickling unit waste heat utilization system, including acidizing fluid jar, descaling bath and condensation water pitcher, be equipped with steam heat exchanger on the acidizing fluid jar, steam heat exchanger's exit end links to each other with the condensation water pitcher, still be equipped with coil pipe heat exchanger between steam heat exchanger and the condensation water pitcher, coil pipe heat exchanger is located the bottom of descaling bath, coil pipe heat exchanger's entry links to each other with steam heat exchanger's export, and coil pipe heat exchanger's export links to each other with the condensation water pitcher.
Further, the coil heat exchanger is a PPH pipe or a polytetrafluoroethylene capillary pipe which is spirally paved at the bottom of the pickling tank.
Furthermore, the bottom of the pickling tank is also provided with wear-resistant blocks and a protection plate overlapped among the wear-resistant blocks, and the coil heat exchanger is positioned below the protection plate.
Furthermore, a water inlet and return flange is arranged on the side surface of the pickling tank, and the pipelines of the steam heat exchanger, the coil heat exchanger and the condensed water tank are connected through the water inlet and return flange.
The beneficial effects of the utility model are: the coil heat exchanger is arranged at the bottom of the pickling tank, and steam condensate water in the steam heat exchanger on the acid liquor tank can be used for heating acid liquor in the pickling tank, so that the acid return temperature of the pickling tank is increased, the steam consumption of the acid liquor tank is reduced, energy is saved, and the requirements of energy conservation and emission reduction are met.
Drawings
FIG. 1 is a schematic diagram of the present invention.
Marked in the figure as 1-acid solution tank, 2-acid washing tank, 3-condensed water tank, 4-steam heat exchanger, 5-coil heat exchanger, 6-wear-resistant block, 7-protective plate and 8-water inlet and return flange.
Detailed Description
The utility model is further described below with reference to the accompanying drawings.
As shown in figure 1, the waste heat utilization system of the hot rolling continuous pickling line comprises a pickling solution tank 1, a pickling tank 2 and a condensed water tank 3, wherein a steam heat exchanger 4 is arranged on the pickling solution tank 1, the outlet end of the steam heat exchanger 4 is connected with the condensed water tank 3, a coil heat exchanger 5 is further arranged between the steam heat exchanger 4 and the condensed water tank 3, the coil heat exchanger 5 is located at the bottom of the pickling tank 2, the inlet of the coil heat exchanger 5 is connected with the outlet of the steam heat exchanger 4, and the outlet of the coil heat exchanger 5 is connected with the condensed water tank 3.
In the prior art, after the acid liquor tank 1 is heated by the steam heat exchanger 4, steam condensate water is directly discharged into the condensate water tank 3, and the steam condensate water after heat exchange has the temperature of about 90-100 ℃, so that the direct heat discharge loss is large, and the requirements of energy conservation and emission reduction are not met. This application is through setting up coil pipe heat exchanger 5 in descaling bath 2 bottoms, can let in coil pipe heat exchanger 5 earlier with the steam condensate water that the heat transfer was accomplished in steam heat exchanger 4, makes it heat the acidizing fluid, discharges into condensate water jar 3 afterwards again. According to the test, after the process is adopted, the acid return temperature of the acid washing tank 2 is increased by about 5-10 ℃ compared with that before the acid washing tank is used, and the steam consumption of the acid liquor tank 1 is reduced by about 5-8%.
For the specific structure of the coil heat exchanger 5, materials such as a PPH pipe or a polytetrafluoroethylene capillary tube which can resist acid liquor corrosion are preferably selected, and the pickling tank is generally made of PPH materials, so that the coil heat exchanger 5 can be directly welded at the bottom of the pickling tank 2 in a hot melting mode to be fixed.
In order to avoid the impact of the hot-rolled strip steel on the coil heat exchanger 5 in the pickling process, the bottom of the pickling tank 2 is also provided with wear-resistant blocks 6 and a protection plate 7 overlapped among the wear-resistant blocks 6, and the coil heat exchanger 5 is positioned below the protection plate 7. Therefore, frequent maintenance work does not exist in the coil heat exchanger 5 basically, and the work of flushing residual acid sludge on the surface, checking the quality of welding seams and the like is carried out only once every month in daily life, so that the maintenance operation is convenient.
Furthermore, in order to facilitate installation and connection of equipment, a water inlet and return flange 8 is arranged on the side surface of the pickling tank 2, and the pipelines of the steam heat exchanger 4, the coil heat exchanger 5 and the condensed water tank 3 are connected through the water inlet and return flange 8.
According to the utility model, the coil heat exchanger is arranged at the bottom of the pickling tank, and the steam condensate water in the steam heat exchanger on the acid liquor tank can be used for heating the acid liquor in the pickling tank, so that the acid return temperature of the pickling tank is increased, the steam consumption of the acid liquor tank is reduced, the energy is saved, the requirements of energy conservation and emission reduction are met, and the system has good practicability and application value.
Claims (4)
1. Hot rolling continuous pickling line waste heat utilization system, including sour liquid jar (1), descaling bath (2) and condensation water pitcher (3), be equipped with steam heat exchanger (4) on sour liquid jar (1), the exit end and the condensation water pitcher (3) of steam heat exchanger (4) link to each other characterized by: still be equipped with coil pipe heat exchanger (5) between steam heat exchanger (4) and condensation water pitcher (3), coil pipe heat exchanger (5) are located the bottom of descaling bath (2), the entry of coil pipe heat exchanger (5) links to each other with the export of steam heat exchanger (4), and the export of coil pipe heat exchanger (5) links to each other with condensation water pitcher (3).
2. The waste heat utilization system of the hot rolling continuous pickling line as claimed in claim 1, characterized in that: the coil heat exchanger (5) is a PPH pipe or a polytetrafluoroethylene capillary pipe which is spirally paved and attached to the bottom of the pickling tank (2).
3. The waste heat utilization system of the hot rolling continuous pickling line as claimed in claim 2, characterized in that: the bottom of the pickling tank (2) is also provided with wear-resistant blocks (6) and a protection plate (7) overlapped among the wear-resistant blocks (6), and the coil heat exchanger (5) is positioned below the protection plate (7).
4. The waste heat utilization system of the hot rolling continuous pickling line as claimed in claim 1, characterized in that: and a water inlet and return flange (8) is arranged on the side surface of the pickling tank (2), and pipelines of the steam heat exchanger (4), the coil heat exchanger (5) and the condensed water tank (3) are connected through the water inlet and return flange (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122719913.7U CN216738550U (en) | 2021-11-08 | 2021-11-08 | Waste heat utilization system of hot rolling continuous pickling line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122719913.7U CN216738550U (en) | 2021-11-08 | 2021-11-08 | Waste heat utilization system of hot rolling continuous pickling line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216738550U true CN216738550U (en) | 2022-06-14 |
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ID=81924915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122719913.7U Active CN216738550U (en) | 2021-11-08 | 2021-11-08 | Waste heat utilization system of hot rolling continuous pickling line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216738550U (en) |
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2021
- 2021-11-08 CN CN202122719913.7U patent/CN216738550U/en active Active
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