Efficient waste heat recycling system for bar hot rolling production line

Abstract

The invention discloses a bar hot rolling production line waste heat efficient recycling system which comprises a walking beam furnace, a waste heat recycling pipe and a waste heat steam boiler, a steam outlet of the waste heat steam boiler is connected with a steam separator, a steam outlet of the steam separator is connected with a heat accumulator, and a steam outlet of the heat accumulator is sequentially connected with a steam turbine and a generator. A steam pressure stabilizer is connected to the third steam pipe, a steam exhaust port of the steam turbine is connected with a condenser, a heat absorption coil pipe is arranged in the condenser, an inlet of the heat absorption coil pipe is communicated with the gas main pipe, an outlet of the heat absorption coil pipe is communicated with a combustor of the stepping heating furnace, and a liquid outlet of the condenser is connected with a deaerator; a liquid outlet of the deaerator is communicated with a liquid inlet of the waste heat steam boiler, and a liquid outlet of the steam separator is communicated with a liquid inlet of the condenser. The device not only can improve the steam yield of the waste heat steam boiler and realize efficient recovery of waste heat, but also can obviously improve the generating capacity.

Description

Technical Field

[0001] The invention belongs to the technical field of steelmaking production, and in particular relates to a system for efficiently recovering and utilizing waste heat from a bar hot rolling production line. Background Art

[0002] Bars are widely used in construction, bridges, machinery and other fields. The hot rolling process is an important link in the bar production process. By mastering the hot rolling process, the mechanical properties and surface quality of the bars can be improved, while reducing production costs and improving production efficiency. The bar production line needs to go through several main process links such as heating, rolling, and cooling after leaving the furnace. Among them, the rolling link is the key link. The heating link of the bar production line is to heat the steel billet to a temperature above the plastic deformation temperature using a walking heating furnace at a suitable temperature. The rolling link is to pass the heated steel billet through a series of rolling units, and deform it into a product of a certain shape and size through continuous pressing, stretching, bending, etc. The cooling link is to cool the rolled product through a cooling unit to gradually reduce its temperature to room temperature, and at the same time perform plastic processing on the material. In the above-mentioned bar production line, in addition to the large amount of waste heat generated in the bar cooling link, a large amount of waste heat is also generated in the flue gas discharged from the walking beam heating furnace during the heating of the steel billet using the walking beam heating furnace. The temperature of the flue gas discharged from the walking beam heating furnace is relatively high. In the existing technology, this part of the flue gas is used to preheat the steel billet and also to generate steam for power generation. In the existing process of using waste heat for power generation, there are the following deficiencies: First, the existing waste heat steam boiler structure adopts a shell-and-tube heat exchanger structure, that is, in the heat exchanger, Multiple smoke pipes are arranged between the two tube plates. When in use, the smoke generated by the walking beam heating furnace continuously passes through the tube wall and exchanges heat with the smoke pipe during its flow in the smoke pipe. As the smoke temperature continues to decrease, due to the low ambient air temperature, the smoke condenses on the inner wall of the smoke pipe. The larger smoke particles in the smoke directly fall to the bottom of the smoke pipe, while the smaller fine dust particles adhere to the inner wall of the smoke pipe as the dew point is generated. As the thickness of the attachment layer on the inner wall of the smoke pipe increases, the heat exchange capacity of the smoke pipe decreases, and the attachment layer will also corrode. At this time, the smoke pipe needs to be vibrated and knocked. First, the adhesion layer on the inner wall of the smoke pipe will be shaken off, which will affect the stable operation of the waste heat steam boiler and the steam production of the waste heat steam boiler; second, the steam produced by the waste heat steam boiler is directly used in the steam turbine generator set for power generation. Due to the large water content of the generated steam, the last stage blades of the steam turbine are susceptible to water erosion damage, the exhaust pressure of the steam turbine is high, and the power generation efficiency of the steam turbine generator set is low, resulting in the defect of excessive cost. At the same time, due to the unstable steam pressure, the steam is difficult to adapt to the operation mode of the steam turbine, which will also cause unstable power generation and low waste heat utilization efficiency. Therefore, it is an objective need to develop a waste heat efficient recovery and utilization system for a hot rolling production line of bars with advanced structural design, stable system operation, high steam production, high waste heat utilization rate, and stable power generation. Summary of the invention

[0003] In order to solve the technical problems of poor system operation stability, low steam production and unstable power generation existing in the background technology, the purpose of the present invention is to provide a high-efficiency waste heat recovery and utilization system for a hot rolling production line of bars with advanced structural design, stable system operation, high steam production, high waste heat utilization rate and stable power generation.

[0004] The waste heat efficient recovery and utilization system of the bar hot rolling production line described in the present invention comprises a walking-type heating furnace, a waste heat recovery pipe and a waste heat steam boiler, the steam outlet of the waste heat steam boiler is connected to a steam separator through a first steam pipe, the steam outlet of the steam separator is connected to a heat accumulator through a second steam pipe, the steam outlet of the heat accumulator is connected to a steam turbine and a generator in sequence through a third steam pipe, the third steam pipe is connected to a steam pressure stabilizer, the exhaust port of the steam turbine is connected to a condenser through an exhaust pipe, a heat absorbing coil is arranged in the condenser, the inlet of the heat absorbing coil is connected to a gas main pipe, the outlet of the heat absorbing coil is connected to a burner of the walking-type heating furnace, the liquid outlet of the condenser is connected to a deaerator through a first drain pipe, the liquid outlet of the deaerator is connected to a liquid inlet of the waste heat steam boiler through a second drain pipe, and the liquid outlet of the steam separator is connected to a liquid inlet of the condenser through a third drain pipe.

[0005] Furthermore, the waste heat steam boiler includes a boiler body and a plurality of ash hoppers evenly installed at the bottom of the boiler body. A heat conduction pipe and a smoke exhaust pipe that pass through the boiler body and extend into the ash hopper are respectively arranged at both ends of the waste heat steam boiler. The heat conduction pipe is connected with the waste heat recovery pipe. A plurality of groups of heat exchange tubes extending into the boiler body are vertically symmetrically installed on two adjacent ash hoppers. The top of each group of heat exchange tubes is connected by a semicircular tube. A spiral discharger is connected to the bottom of the plurality of ash hoppers. A plurality of heat exchange fins are arranged on the outer wall of each group of heat exchange tubes. A steam distribution plate is arranged at the upper part of the boiler body. The heat conduction pipe passes through the steam distribution plate, and the semicircular tube is located above the steam distribution plate. Steam holes are evenly arranged on the steam distribution plate between two adjacent groups of heat conduction pipes. The steam outlet of the waste heat steam boiler is arranged at the top of the boiler body above the steam distribution plate, and the liquid inlet of the waste heat steam boiler is arranged on the boiler body at the lower side of the overall distribution plate.

[0006] Furthermore, the steam separator includes a tank body and a primary separation cylinder, an upper separation plate and a lower separation plate are arranged at intervals in the upper and lower parts of the tank body, the primary separation cylinder is fixedly installed between the upper separation plate and the lower separation plate, a plurality of steam guide pipes are vertically and evenly installed on the upper separation plate between the primary separation cylinder and the tank body, and a plurality of liquid guide holes are evenly arranged on the lower separation plate between the primary separation cylinder and the tank body; the steam separator also includes a secondary separation cylinder, an upper mounting hole is arranged on the upper separation plate inside the primary separation cylinder, a lower connecting hole is arranged on the lower separation plate inside the primary separation cylinder, the secondary separation cylinder is installed in the upper mounting hole, a bottom plate is installed at the bottom of the secondary separation cylinder, a plurality of inclined holes are evenly arranged on the secondary separation cylinder located inside the primary separation cylinder, 2 to 3 layers of wire mesh are arranged in the primary separation cylinder below the secondary separation cylinder, and an angle α between the central axis of the inclined hole and the central axis of the primary separation cylinder is 45 to 55°.

[0007] Furthermore, the steam pressure stabilizer includes a first bypass pipe, a second bypass pipe and a pressure-stabilizing tank, one end of the first bypass pipe is connected to the third steam pipe, the other end of the first bypass pipe is connected to the pressure-stabilizing tank, one end of the second bypass pipe is connected to the pressure-stabilizing tank, the other end of the second bypass pipe is connected to the third steam pipe, a bypass valve is installed on the first bypass pipe, a first pressure relief valve is installed on the second bypass pipe, and a pressure sensor, a control valve and a second pressure relief valve are installed in sequence on the third steam pipe between the first bypass pipe and the second bypass pipe.

[0008] Compared with the existing waste heat recovery system, the advantages of the present invention are: first, the present invention optimizes the structure of the waste heat steam boiler. During the use of the waste heat steam boiler, it can not only increase the heat exchange area and improve the steam production of the waste heat boiler, but also prevent the smoke dust in the smoke from adhering to the inner wall of the smoke pipe under the condition that the flue gas and water can be fully exchanged with each other, so that the heat exchange efficiency of the waste heat steam boiler can be maintained for a long time and effectively, and the need to clean the smoke dust from the smoke pipe can be avoided, so as to ensure the long-term stable operation of the waste heat boiler; second, the present device optimizes the connection structure between the waste heat steam boiler and the steam turbine generator set, and a steam separator and a heat accumulator are arranged between the two. The steam separator can separate the generated steam into gas and liquid, and separate the water vapor carried in the steam into the water vapor. The steam pressure regulator is used to adjust the steam pressure so that the steam pressure entering the steam turbine generator set is stable and the steam power generation capacity is stable. In addition, the condenser arranged at the exhaust port of the steam turbine recovers the waste heat of the steam by using the fuel gas entering the step-beam heating furnace, so that the waste heat of the flue gas can be recovered efficiently and the energy consumption of the step-beam heating furnace can be reduced. In summary, this device can not only increase the steam production of the waste heat steam boiler and realize efficient recovery of waste heat, but also significantly increase the power generation. Under the same waste heat recovery rate, it can generate about 20% more electricity, thereby greatly improving the economy of the waste heat power generation system. It has the advantages of reasonable structural design and stable system operation, and is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the waste heat steam boiler 3 in the present invention; Figure 3 It is a structural schematic diagram of the steam separator 5 in the present invention; In the figure: 1-walking heating furnace, 2-waste heat recovery pipe, 3-waste heat steam boiler, 31-boiler body, 32-ash hopper, 33-heat conduction pipe, 34-smoke exhaust pipe, 35-heat exchange pipe, 36-semicircular pipe, 37-screw discharger, 38-heat exchange fin, 39-steam distribution plate, 310-steam hole, 4-first steam pipe, 5-steam separator, 51-tank body, 52-first separation cylinder, 53-upper separation plate, 54-lower separation plate, 55-steam guide pipe, 56-liquid guide hole, 57-secondary separation From the cylinder, 58-inclined hole, 59-wire mesh, 6-second steam pipe, 7-heat accumulator, 8-third steam pipe, 81-pressure sensor, 82-control valve, 83-second pressure relief valve, 9-steam turbine, 10-generator, 11-condenser, 12-heat absorption coil, 13-gas main pipe, 14-first drain pipe, 15-deaerator, 16-second drain pipe, 17-third drain pipe, 18-first connecting pipe, 19-second connecting pipe, 20-pressure stabilizing tank, 21-bypass valve, 22-first pressure relief valve. DETAILED DESCRIPTION

[0010] The present invention is further described below in conjunction with the embodiments and accompanying drawings, but the present invention is not limited in any way. Any changes or substitutions made based on the teachings of the present invention belong to the protection scope of the present invention.

[0011] like Figures 1 to 3 As shown, the waste heat efficient recovery and utilization system of the bar hot rolling production line of the present invention comprises a walking-beam heating furnace 1, a waste heat recovery pipe 2 and a waste heat steam boiler 3. The walking-beam heating furnace 1 is a gas-fired structure used in the prior art. The steam outlet of the waste heat steam boiler 3 is connected to a steam separator 5 through a first steam pipe 4. The steam outlet of the steam separator 5 is connected to a heat accumulator 7 through a second steam pipe 6. The steam outlet of the heat accumulator 7 is connected to a steam turbine 9 and a generator 10 in sequence through a third steam pipe 8. The steam turbine 9 and the generator 10 are structures used in the prior art. The third steam pipe 8 is connected to a steam pressure stabilizer, the exhaust port of the steam turbine 9 is connected to a condenser 11 through an exhaust pipe, a heat absorbing coil 12 is arranged in the condenser 11, the inlet of the heat absorbing coil 12 is connected to the gas main pipe 13, the outlet of the heat absorbing coil 12 is connected to the burner of the walking-beam heating furnace 1, the liquid outlet of the condenser 11 is connected to a deaerator 15 through a first drain pipe 14, the liquid outlet of the deaerator 15 is connected to the liquid inlet of the waste heat steam boiler 3 through a second drain pipe 16, and the liquid outlet of the steam separator 5 is connected to the liquid inlet of the condenser 11 through a third drain pipe 17.

[0012] The working process of this device is: the high-temperature flue gas generated by the walking-beam heating furnace 1 enters the waste heat steam boiler 3 through the waste heat recovery pipe 2. After the high-temperature flue gas enters the waste heat steam boiler 3, it exchanges heat with cold water. After the cold water absorbs heat, it will continuously generate steam. The generated steam first enters the steam separator 5 through the first steam pipe 4. The steam separator 5 can perform gas-liquid separation on the generated steam, separate the water vapor carried in the steam, reduce the water vapor content in the steam, and increase the dryness of the steam. The steam after separation enters the heat accumulator 7 through the second steam pipe 6 for storage. At this time, the steam in the heat accumulator 7 can enter the steam turbine 9 through the third steam pipe 8 to drive the generator 10 to generate electricity. The condensed water generated during the operation of the steam turbine 9 enters the condenser 11 through the exhaust pipe. At this time, The combustion gas entering the walking-beam heating furnace 1 absorbs the heat of condensed water in the heat absorbing coil 12 and then enters the walking-beam heating furnace 1, so that the gas can be preheated and the combustion efficiency of the walking-beam heating furnace 1 can be improved. The condensed water after cooling by the heat absorbing coil 11 enters the deaerator 15 through the first drain pipe 14 for deoxygenation, and then enters the waste heat steam boiler 3 through the second drain pipe 16 for use, so that the steam production of the waste heat steam boiler 7 can be increased. In this process, the water separated by the steam separator 5 can also enter the condenser 11 through the third drain pipe 17 for recycling, saving water resources. At the same time, the present invention is provided with an automatic steam pressure stabilizer on the third steam pipe 8, and the steam pressure stabilizer can adjust the steam pressure to stabilize the steam pressure entering the steam turbine generator set, thereby ensuring the stability of steam power generation.

[0013] Furthermore, the waste heat steam boiler 3 includes a boiler body 31 and a plurality of ash hoppers 32 evenly installed at the bottom of the boiler body 31. The two ends of the waste heat steam boiler 31 are respectively provided with a heat conduction pipe 33 and a smoke exhaust pipe 34 that pass through the boiler body 31 and extend into the ash hopper 32. The heat conduction pipe 33 is connected to the waste heat recovery pipe 2. A plurality of groups of heat exchange pipes 35 extending into the boiler body 31 are vertically symmetrically installed on two adjacent ash hoppers 32. The top of each group of heat exchange pipes 35 is connected by a semicircular pipe 36. The bottom of the plurality of ash hoppers 32 is connected with a spiral discharger 37. When in use, the high-temperature flue gas collected by the waste heat recovery pipe 2 passes through The heat transfer pipe 33 enters the boiler body 31, and then enters the ash receiving hopper 32 connected thereto. During the high-temperature flue gas flowing in the heat transfer pipe 33, the smoke with larger particles in the high-temperature flue gas falls into the corresponding ash receiving hopper 32. The smoke entering the ash receiving hopper 32 enters the heat exchange pipe 35 connected to the ash receiving hopper, and then enters the heat exchange pipe 35 on the other side through the semicircular pipe 36 connected thereto, and then enters the next ash receiving hopper 32 through the heat exchange pipe 35 on the other side. The high-temperature flue gas flows in the heat exchange pipe 35 between adjacent ash receiving hoppers 32 in the above-mentioned flow mode. During the flow of the flue gas, the smoke dust in the flue gas will be discharged according to the above-mentioned flow mode. The ash enters the corresponding ash receiving hopper 32 by gravity and is collected uniformly by the spiral discharging machine 37. The cold water in the boiler body 31 exchanges heat with the high-temperature flue gas. After the cold water continuously absorbs heat, it will continuously generate steam. The generated steam is discharged through the first steam pipe 4. After the high-temperature flue gas absorbs heat by the cold water, the temperature is reduced and then discharged from the boiler body 31 through the exhaust pipe 34. Preferably, in order to improve the heat exchange effect between the high-temperature flue gas and the cold water and increase the steam production, a plurality of heat exchange fins 38 are arranged on the outer wall of each group of heat exchange tubes 35. Preferably, in order to reduce the water content in the steam, the upper part of the boiler body 31 is provided with The steam distribution plate 39, the heat pipe 35 passes through the steam distribution plate 39, and the semicircular tube 36 is located above the steam distribution plate 39, and steam holes 310 are evenly distributed on the steam distribution plate 39 between two adjacent groups of heat pipes 35. The steam outlet of the waste heat steam boiler 3 is arranged on the top of the boiler body 31 above the steam distribution plate 39, and the liquid inlet of the waste heat steam boiler 3 is arranged on the boiler body 31 on the lower side of the integral distribution plate 39. The steam distribution plate 39 has the function of steam separation, and the generated steam enters the upper space of the steam distribution plate 39 through the steam holes 310, which can prevent excessive water vapor from being discharged from the boiler body 31 with the steam.

[0014] Furthermore, the steam separator 5 includes a tank body 51 and a primary separation cylinder 52, wherein an upper separation plate 53 and a lower separation plate 54 are arranged at intervals in the upper and lower parts of the tank body 51, and the primary separation cylinder 52 is fixedly installed between the upper separation plate 53 and the lower separation plate 54, and a plurality of steam guide pipes 55 are evenly and vertically installed on the upper separation plate 53 between the primary separation cylinder 52 and the tank body 51, and a plurality of liquid guide holes 56 are evenly arranged on the lower separation plate 54 between the primary separation cylinder 52 and the tank body 51. In order to reduce the water vapor content of the steam, the steam discharged from the first steam pipe 4 first enters between the upper separation plate 53 and the lower separation plate 54, and after the steam enters the tank body 51 and is separated by the primary separation cylinder 52, the steam enters the upper part of the tank body 51 from the steam guide pipe 55, and the water vapor enters the lower part of the tank body 51 through the liquid guide holes 56. In order to better improve the utilization rate of the steam, the steam separator 5 also includes a secondary separation cylinder 57, An upper mounting hole is provided on the plate 52, and a lower connecting hole is provided on the lower separation plate 54 on the inner side of the primary separation cylinder 52. The secondary separation cylinder 57 is installed in the upper mounting hole, and a bottom plate is installed at the bottom of the secondary separation cylinder 57. A plurality of inclined holes 58 are evenly distributed on the secondary separation cylinder 57 located in the primary separation cylinder 52. After entering from the liquid guide hole 56 to the lower part of the tank body 51, a small amount of steam in the water vapor rises and enters the primary separation cylinder 52, and is separated again through the inclined holes 58 of the secondary separation cylinder 57, so that the water vapor in the steam can be completely separated. Preferably, in order to achieve a better separation effect, the angle α between the central axis of the inclined hole 58 and the central axis of the primary separation cylinder 52 is 45-55°, and 2-3 layers of wire mesh 59 are provided in the primary separation cylinder 52 below the secondary separation cylinder 57. The wire mesh 59 can perform gas-liquid separation on the water vapor entering the secondary separation cylinder 57, so that the water content in the steam is greatly reduced and the dryness of the steam is significantly improved.

[0015] Furthermore, the steam pressure stabilizer includes a first bypass pipe 18, a second bypass pipe 19 and a pressure stabilizing tank 20, one end of the first bypass pipe 18 is connected to the third steam pipe 8, the other end of the first bypass pipe 18 is connected to the pressure stabilizing tank 20, one end of the second bypass pipe 19 is connected to the pressure stabilizing tank 20, the other end of the second bypass pipe 19 is connected to the third steam pipe 8, a bypass valve 21 is installed on the first bypass pipe 18, a first pressure relief valve 22 is installed on the second bypass pipe 19, and a pressure sensor 81, a control valve 82 and a second pressure relief valve 83 are installed in sequence on the third steam pipe 8 between the first bypass pipe 18 and the second bypass pipe 19. The pressure sensor 81 is a structure used in the prior art, and the finished product can be directly purchased according to the needs of use. When the pressure sensor 81 monitors When the steam pressure is high, increase the valve opening of the control valve 82 and open the bypass valve 21. The steam entering the third steam pipe 8 will enter the pressure-stabilizing tank 20 through the first bypass pipe 18, thereby reducing the steam pressure in the third steam pipe 8. When the steam pressure in the third steam pipe 8 is normal, close the bypass valve 21 to prevent the steam from entering the first bypass pipe 18. When the steam pressure in the third steam pipe 8 is low, reduce the valve opening of the control valve 82 to increase the steam pressure in the third steam pipe 8. At the same time, the steam pressure in the third steam pipe 8 can be made more stable through the first pressure relief valve 22, and the steam pressure in the third steam pipe 8 can be better adjusted through the second pressure relief valve 83, so that the steam pressure in the third steam pipe 8 can always be at an appropriate level.

Claims

1. A waste heat efficient recovery and utilization system for a bar hot rolling production line, comprising a walking beam heating furnace (1), a waste heat recovery pipe (2) and a waste heat steam boiler (3), characterized in that: The steam outlet of the waste heat steam boiler (3) is connected to a steam separator (5) via a first steam pipe (4), the steam outlet of the steam separator (5) is connected to a heat accumulator (7) via a second steam pipe (6), the steam outlet of the heat accumulator (7) is connected to a steam turbine (9) and a generator (10) in sequence via a third steam pipe (8), the third steam pipe (8) is connected to a steam pressure stabilizer, the exhaust port of the steam turbine (9) is connected to a condenser (11) via an exhaust pipe, and an intake manifold is provided in the condenser (11). The heat absorbing coil (12) has an inlet connected to a gas main (13), an outlet connected to a burner of a step-beam heating furnace (1), a liquid outlet of the condenser (11) connected to a deaerator (15) via a first liquid discharge pipe (14), a liquid outlet of the deaerator (15) connected to a liquid inlet of a waste heat steam boiler (3) via a second liquid discharge pipe (16), and a liquid outlet of the steam separator (5) connected to a liquid inlet of the condenser (11) via a third liquid discharge pipe (17).

2. According to claim 1, a waste heat efficient recovery and utilization system for a bar hot rolling production line is characterized in that: The waste heat steam boiler (3) comprises a boiler body (31) and a plurality of ash receiving hoppers (32) evenly distributed at the bottom of the boiler body (31). A heat conducting pipe (33) and a smoke exhaust pipe (34) passing through the boiler body (31) and extending into the ash receiving hopper (32) are respectively arranged at both ends of the waste heat steam boiler (31). The heat conducting pipe (33) is connected to the waste heat recovery pipe (2). A plurality of groups of heat exchange tubes (35) extending into the boiler body (31) are vertically symmetrically installed on two adjacent ash receiving hoppers (32). The top of each group of heat exchange tubes (35) is connected by a semicircular tube (36). The bottoms of the plurality of ash receiving hoppers (32) are connected to a spiral discharger (37).

3. The system for efficiently recovering and utilizing waste heat from a hot rolling production line for bars according to claim 2 is characterized in that: A plurality of heat exchange fins (38) are arranged on the outer wall of each group of heat exchange tubes (35).

4. The system for efficiently recovering and utilizing waste heat from a hot rolling production line of bars according to claim 2 is characterized in that: A steam distribution plate (39) is arranged at the upper part of the boiler body (31); the heat conducting pipe (35) passes through the steam distribution plate (39); and the semicircular pipe (36) is located above the steam distribution plate (39); steam holes (310) are evenly distributed on the steam distribution plate (39) between two adjacent groups of heat conducting pipes (35); a steam outlet of the waste heat steam boiler (3) is arranged at the top of the boiler body (31) above the steam distribution plate (39); and a liquid inlet of the waste heat steam boiler (3) is arranged on the boiler body (31) at the lower side of the integral distribution plate (39).

5. The system for efficiently recovering and utilizing waste heat from a hot rolling production line of bars according to claim 1 is characterized in that: The steam separator (5) comprises a tank body (51) and a primary separation cylinder (52); an upper separation plate (53) and a lower separation plate (54) are arranged in an upper and lower interval inside the tank body (51); the primary separation cylinder (52) is fixedly installed between the upper separation plate (53) and the lower separation plate (54); a plurality of steam guide pipes (55) are evenly arranged vertically on the upper separation plate (53) between the primary separation cylinder (52) and the tank body (51); and a plurality of liquid guide holes (56) are evenly arranged on the lower separation plate (54) between the primary separation cylinder (52) and the tank body (51).

6. The system for efficiently recovering and utilizing waste heat from a hot rolling production line of bars according to claim 5 is characterized in that: The steam separator (5) further comprises a secondary separation cylinder (57), an upper mounting hole is arranged on the upper separation plate (52) on the inner side of the primary separation cylinder (52), a lower connecting hole is arranged on the lower separation plate (54) on the inner side of the primary separation cylinder (52), the secondary separation cylinder (57) is installed through the upper mounting hole, a bottom plate is installed at the bottom of the secondary separation cylinder (57), and a plurality of inclined holes (58) are evenly distributed on the secondary separation cylinder (57) located inside the primary separation cylinder (52).

7. The system for efficiently recovering and utilizing waste heat from a hot rolling production line of bars according to claim 6 is characterized in that: Two to three layers of wire mesh (59) are arranged in the primary separation cylinder (52) below the secondary separation cylinder (57).

8. The system for efficiently recovering and utilizing waste heat from a hot rolling production line of bars according to claim 1 is characterized in that: The angle α between the central axis of the inclined hole (58) and the central axis of the primary separation cylinder (52) is 45 to 55 degrees.

9. The system for efficiently recovering and utilizing waste heat from a hot rolling production line of bars according to claim 1, characterized in that: The steam pressure stabilizer comprises a first bypass pipe (18), a second bypass pipe (19) and a pressure stabilizing tank (20); one end of the first bypass pipe (18) is connected to a third steam pipe (8); the other end of the first bypass pipe (18) is connected to the pressure stabilizing tank (20); one end of the second bypass pipe (19) is connected to the pressure stabilizing tank (20); the other end of the second bypass pipe (19) is connected to the third steam pipe (8); a bypass valve (21) is installed on the first bypass pipe (18); a first pressure relief valve (22) is installed on the second bypass pipe (19); and a pressure sensor (81), a control valve (82) and a second pressure relief valve (83) are installed in sequence on the third steam pipe (8) between the first bypass pipe (18) and the second bypass pipe (19).

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