Hot steel coil heat recovery equipment

Abstract

The utility model relates to the technical field of hot steel coil heat recovery, in particular to hot steel coil heat recovery equipment. The hot steel coil heat recovery equipment comprises a heat recovery module A, a heat recovery module B, a heat exchange medium storage tank A, a heat exchange medium storage tank B, a flash evaporation system and a waste heat boiler, and a heat exchange medium stored in the heat exchange medium storage tank A flows through the heat recovery module A for heat exchange and then is input into the heat exchange medium storage tank B; and a heat exchange medium in the heat exchange medium storage tank B is input into the flash evaporation system to generate steam A, the steam A input by the flash evaporation system flows through the heat recovery module B for heat exchange to obtain steam B, the obtained steam B is input into the waste heat boiler, and steam C output by the waste heat boiler is used for power generation or drying or is input into a steam pipe network. The hot steel coil heat recovery equipment and the hot steel coil transfer heat in a direct contact mode. By means of the hot steel coil heat recovery equipment, the investment cost is low, and the heat exchange efficiency and the waste heat recovery rate can be effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of heat recovery of hot steel coils, and in particular to a heat recovery device for hot steel coils. Background Art

[0002] At present, the hot rolled coils and annealed cold rolled coils in the metallurgical industry have a temperature of 450-650℃ after rolling. Most of them are cooled naturally to room temperature, and some are cooled to room temperature by blowing air. Most of the existing hot steel coil cooling methods are to dissipate the heat into the air and recycle its heat energy. There are also a few hot steel coil cooling methods that involve this part of heat energy recycling. Specifically, as disclosed in Chinese patent CN103939160A, an off-line device and method for recovering waste heat of hot rolled strip steel adopts a circulating air method to cool the hot rolled strip coils with high temperature with cold air. At the same time, the hot air generated enters the waste heat boiler to produce steam for drying, power generation, etc., achieving the purpose of energy saving. For example, as disclosed in Chinese patent CN102427893A, a method and device for recovering energy from hot rolled strip coils is used. Through a hood device similar to a tunnel furnace, the heat is collected when the hot coil passes through the device. The hot air generated can even be used as waste heat air entering the blast furnace, achieving the purpose of energy saving.

[0003] With respect to the heat recovery of hot steel coils in the above prior art, the inventors found the following defects: the investment cost of the heat recovery equipment for hot steel coils is high and the heat recovery efficiency is low. Therefore, the inventors provide a heat recovery equipment for hot steel coils. Utility Model Content

[0004] In order to solve the problems of high investment cost and low heat recovery efficiency of existing hot steel coil heat recovery equipment, the present application provides a hot steel coil heat recovery equipment.

[0005] The present application provides a heat recovery device for hot steel coils, which is realized by the following technical solutions:

[0006] A heat recovery device for hot steel coils comprises a heat recovery module A, a heat recovery module B, a heat exchange medium storage tank A, a heat exchange medium storage tank B, a flash evaporation system, and a waste heat boiler. The heat exchange medium stored in the heat exchange medium storage tank A flows through the heat recovery module A for heat exchange and is then input into the heat exchange medium storage tank B. The heat exchange medium in the heat exchange medium storage tank B is input into the flash evaporation system to generate steam A. The steam A input into the flash evaporation system flows through the heat recovery module B for heat exchange and obtains steam B. The obtained steam B is input into the waste heat boiler. The steam C output from the waste heat boiler is used for power generation or drying or is input into a steam network.

[0007] Preferably, the heat recovery module A includes a plurality of heat recovery units A, and the heat recovery units A are connected to the heat exchange medium storage tank A and the heat exchange medium storage tank B; a single heat recovery unit A includes a heat exchange component A that is in direct contact with the hot steel coil for heat exchange and a serpentine heat exchange medium circulation pipe A, and one end of the serpentine heat exchange medium circulation pipe A is connected to the heat exchange medium storage tank A and the other end is connected to the heat exchange medium storage tank B.

[0008] Preferably, the heat recovery module B comprises several heat recovery units B, and the heat recovery units B are connected to the flash evaporation system and the waste heat boiler; the heat recovery unit B comprises a heat exchange component B for direct contact heat exchange with the hot steel coil and a serpentine heat exchange medium circulation pipe B, one end of the serpentine heat exchange medium circulation pipe B is connected to the flash tank of the flash evaporation system and the other end is connected to the waste heat boiler.

[0009] The hot steel coil heat recovery equipment in the present application transfers heat with the hot steel coil in direct contact. Using the hot steel coil heat recovery equipment of the above design for heat recovery not only has a low investment cost, but also can effectively improve the heat exchange efficiency and waste heat recovery rate.

[0010] Preferably, the heat exchange element A is a rectangular steel plate and / or a cylindrical steel plate.

[0011] Preferably, the heat exchange element B is a rectangular steel plate and / or a cylindrical steel plate.

[0012] Preferably, when the heat exchange component A is a rectangular steel plate, the serpentine heat exchange medium circulation tube A is fixedly connected to the bottom surface of the heat exchange component A; the bottom surface of the heat exchange component A is fixedly connected with an insulating support bar A; the insulating support bar A is located between the gaps of the serpentine heat exchange medium circulation tube A; when the heat exchange component B is a rectangular steel plate, the serpentine heat exchange medium circulation tube B is fixedly connected to the bottom surface of the heat exchange component B; the bottom surface of the heat exchange component B is fixedly connected with an insulating support bar B; the insulating support bar B is located between the gaps of the serpentine heat exchange medium circulation tube B.

[0013] Preferably, in order to support and fix the heat exchanger A, both side ends of the heat exchanger A are fixedly connected with I-beams.

[0014] Preferably, in order to support and fix the heat exchanger B, both side ends of the heat exchanger B are fixedly connected with I-beams.

[0015] By adopting the above scheme, the investment cost is low and the operation is simple, and the hot steel coil heat energy recovery process is relatively simple and can be implemented.

[0016] Preferably, the heat exchanger A comprises an annular cylindrical steel plate, and the serpentine heat exchange medium circulation pipe A is fixedly connected to a surface of the heat exchanger A that is away from the contact surface with the hot steel coil; the heat exchanger B comprises an annular cylindrical steel plate, and the serpentine heat exchange medium circulation pipe B is fixedly connected to a surface of the heat exchanger B that is away from the contact surface with the hot steel coil; the heat exchanger A and the heat exchanger B are respectively moved by mechanical arms to the outer surface of the hot steel coil and abut against each other.

[0017] Preferably, the outer surfaces of the heat exchange components A and B are fixedly connected with a thermal conductive coating; the serpentine heat exchange medium circulation tube A and the serpentine heat exchange medium circulation tube B are steel square tubes, and the outer walls of the serpentine heat exchange medium circulation tube A and the serpentine heat exchange medium circulation tube B are fixedly connected with a thermal insulation coating.

[0018] By adopting the above technical solution, the heat energy recovery efficiency of hot steel coils can be further improved, and the heat energy resources of hot steel coils can be fully recovered, which is beneficial to reducing the production energy consumption of the steel industry and is in line with the concept of green development.

[0019] Preferably, the liquid outlet end of the heat exchange medium storage tank A is fixedly connected with a first solenoid valve and a first temperature detector; the liquid inlet end of the heat exchange medium storage tank B is fixedly connected with a second solenoid valve and a second temperature detector; the liquid outlet end of the heat exchange medium storage tank B is fixedly connected with a third solenoid valve and a third temperature detector; the liquid inlet end of the flash evaporation system is fixedly connected with a fourth solenoid valve and a fourth temperature detector; the steam output end of the flash evaporation system is fixedly connected with a fifth solenoid valve and a fifth temperature detector; the steam input end of the waste heat boiler is fixedly connected with a sixth solenoid valve and a sixth temperature detector; the steam output end of the waste heat boiler is fixedly connected with a seventh solenoid valve and a seventh temperature detector; the steam output from the steam output end of the waste heat boiler is used for power generation or drying or is input into a steam pipeline network.

[0020] Preferably, the input end of the serpentine heat exchange medium circulation tube A is fixedly connected with an eighth solenoid valve and an eighth temperature detector; the output end of the serpentine heat exchange medium circulation tube A is fixedly connected with a ninth solenoid valve and a ninth temperature detector; the input end of the serpentine heat exchange medium circulation tube B is fixedly connected with a tenth solenoid valve and a tenth temperature detector; the output end of the serpentine heat exchange medium circulation tube B is fixedly connected with an eleventh solenoid valve and an eleventh temperature detector.

[0021] By adopting the above technical solution, the quality of the steam outputted from the waste heat boiler can be effectively controlled, and the use value of the output steam can be improved. The steam can be directly inputted into the steam generator for use, can be used for steam power generation, and can also be used as a heat source for drying equipment.

[0022] A method for recovering heat from hot steel coils using a hot steel coil heat recovery device is as follows:

[0023] Step 1: Loading hot steel coils on heat recovery module A and heat recovery module B respectively;

[0024] Step 2: The heat exchange medium in the heat exchange medium storage tank A is input into the serpentine heat exchange medium flow pipe A of the heat recovery module A under the extraction action of the centrifugal pump, and the heat exchange medium flowing through the serpentine heat exchange medium flow pipe A is input into the heat exchange medium storage tank B for storage. The flow rate of the heat exchange medium is 0.5-2m / s. The heat exchange medium stored in the heat exchange medium storage tank B is thermally adjusted so that the temperature of the heat exchange medium input into the flash evaporation system is 175-200°C and the pressure is 1.0-2.0 MPa.

[0025] Step three, the heat exchange medium output from the heat exchange medium storage tank B is flashed by the flash evaporation system to form steam A, the steam pressure of the obtained steam A is 0.5-0.8MPa, the steam A flows through the serpentine heat exchange medium circulation pipe B under the action of the pressure pump, and the steam A is converted into steam B under the heat exchange of the serpentine heat exchange medium circulation pipe B. The flow rate of the steam A is 1-10m / s, and the steam pressure of the obtained steam B is 10-1.6MPa. The obtained steam B is input into the waste heat boiler, and the steam B is converted into steam C under the heating of the waste heat boiler. The steam pressure of steam C is ≥1.6MPa, and the obtained steam C is used for power generation or drying or input into the steam network.

[0026] The method for recovering heat from hot steel coils provided in the present application is relatively simple and easy to implement, and effectively improves the heat exchange efficiency and waste heat recovery rate of the hot steel coils, fully recovers the thermal energy resources of the hot steel coils, is conducive to reducing production energy consumption, and is in line with the concept of green development.

[0027] In summary, this application has the following advantages:

[0028] 1. The hot steel coil heat recovery device in the utility model transfers heat with the hot steel coil in a direct contact manner. The use of the hot steel coil heat recovery device designed by the inventor not only has a low investment cost, but also can effectively improve the heat exchange efficiency and waste heat recovery rate.

[0029] 2. The heat recovery method for hot steel coils provided in the utility model is relatively simple and easy to implement, and effectively improves the heat exchange efficiency and waste heat recovery rate of the hot steel coils, fully recovers the thermal energy resources of the hot steel coils, is conducive to reducing production energy consumption, and is in line with the concept of green development. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the hot steel coil heat recovery equipment in the embodiment of the present application.

[0031] Figure 2 It is a schematic diagram of the first structural design of the heat exchange component A in the embodiment of the present application.

[0032] Figure 3 It is a schematic diagram of the first structural design of the heat exchange component B in the embodiment of the present application.

[0033] Figure 4 It is a schematic diagram of the second structural design of the heat exchanger A in the embodiment of the present application.

[0034] Figure 5 It is a schematic diagram of the second structural design of the heat exchange component B in the embodiment of the present application.

[0035] Figure 6 It is a schematic diagram of the third structural design of the heat exchange component A in the embodiment of the present application.

[0036] Figure 7 It is a schematic diagram of the third structural design of the heat exchange component B in the embodiment of the present application.

[0037] In the figure, 1. heat recovery module A; 10. heat recovery unit A; 101. heat exchanger A; 102. serpentine heat exchange medium circulation pipe A; 1021. eighth solenoid valve; 1022. eighth temperature detector; 1023. ninth solenoid valve; 1024. ninth temperature detector; 103. insulation support bar A; 104. I-beam A; 2. heat recovery module B; 20. heat recovery unit B; 201. heat exchanger B; 202. serpentine heat exchange medium circulation pipe B; 2021. tenth solenoid valve; 20222. tenth temperature detector; 2023. eleventh solenoid valve; 2024. eleventh temperature detector; 203. insulation support bar B; 204. I-beam B; 3. heat exchange medium storage tank A; 31. First solenoid valve; 32. First temperature detector; 4. Heat exchange medium storage tank B; 41. Second solenoid valve; 42. Second temperature detector; 43. Third solenoid valve; 44. Third temperature detector; 5. Flash system; 51. Fourth solenoid valve; 52. Fourth temperature detector; 53. Fifth solenoid valve; 54. Fifth temperature detector; 55. Twelfth solenoid valve; 56. Twelfth temperature detector; 57. Thirteenth solenoid valve; 6. Waste heat boiler; 61. Sixth solenoid valve; 62. Sixth temperature detector; 63. Seventh solenoid valve; 64. Seventh temperature detector; 7. Transmission pipe A; 71. Transmission pipe B; 72. Transmission pipe C; 73. Transmission pipe D; 731. Transmission pipe F; 74. Transmission pipe E. DETAILED DESCRIPTION

[0038] The present application is further described in detail below with reference to the accompanying drawings and embodiments. Example

[0039] Reference Figure 1A heat recovery device for hot steel coils includes a heat recovery module A1, a heat recovery module B2, a heat exchange medium storage tank A3, a heat exchange medium storage tank B4, a flash evaporation system 5, and a waste heat boiler 6. The heat exchange medium storage tank A3 is interconnected with the heat recovery module A1 and the heat recovery module B2. The heat recovery module B2 is interconnected with the waste heat boiler 6 and the flash evaporation system 5. The flash evaporation system 5 is interconnected with the heat exchange medium storage tank B4 and the waste heat boiler 6. The hot steel coil recovery method of the hot steel coil heat recovery equipment is briefly introduced as follows: the heat exchange medium stored in the heat exchange medium storage tank A3 (specifically tap water or distilled water recovered from steam condensation) is transported to the heat recovery module A1 for heat exchange under the action of a centrifugal pump. The heat exchange medium output from the heat exchange medium storage tank A3 flows through the heat recovery module A1 for heat exchange and is then input into the heat exchange medium storage tank B4 for storage. The built-in thermal compensator in the heat exchange medium storage tank B4 performs thermal compensation on the stored heat exchange medium to ensure that the temperature of the heat exchange medium output from the heat exchange medium storage tank B4 is between 175-200°C and the pressure is between 1-2MPa. The high-temperature and high-pressure heat exchange medium output from the mass storage tank B4 is input to the flash evaporation system 5 for flash evaporation treatment to generate steam A with a vapor pressure of 0.5-0.8 MPa. The steam A input from the flash evaporation system 5 flows into the heat recovery module B2 under the transmission of the booster pump. After passing through the heat recovery module B2 for heat exchange, the steam A is heated into steam B with a vapor pressure of 10-1.6 MPa. The steam B is input to the waste heat boiler 6. Under the heat compensation of the waste heat boiler 6, the steam B is heated into steam C with a vapor pressure of ≥1.6 MPa. The output steam C is used for power generation or drying or input into the steam network.

[0040] Reference Figure 1 , the heat recovery module A1 includes a plurality of heat receiving units A10 connected to the heat exchange medium storage tank A3 and the heat exchange medium storage tank B4. A single heat recovery unit A10 includes a heat exchange component A101 and a serpentine heat exchange medium circulation pipe A102 that directly contacts and exchanges heat with the hot steel coil. One end of the serpentine heat exchange medium circulation pipe A102 is fixedly connected to the liquid outlet of the heat exchange medium storage tank A3 through a transmission pipe A7, and the other end of the serpentine heat exchange medium circulation pipe A102 is fixedly connected to the liquid inlet of the heat exchange medium storage tank B4 through a transmission pipe B71. The liquid outlet of the heat exchange medium storage tank B4 is fixedly connected to the heat exchange medium input end of the flash tank of the flash system 5 through a transmission pipe C72.

[0041] Reference Figure 1 In order to improve the heat recovery efficiency, the outer surface of the heat exchanger A101 is fixedly connected with a thermal conductive coating. The serpentine heat exchange medium circulation pipe A102 is a steel square pipe or a steel round pipe, and the outer wall of the serpentine heat exchange medium circulation pipe A102 is fixedly connected with a thermal insulation coating. The outer walls of the transmission pipes A7, B71, and C72 are fixedly connected with thermal insulation coatings.

[0042] Reference Figure 1In order to accurately control the temperature of the output heat exchange medium and the flow rate of the heat exchange medium, the liquid outlet of the heat exchange medium storage tank A3 is fixedly connected with a first solenoid valve 31 and a first temperature detector 32.

[0043] Reference Figure 1 In order to accurately control the temperature of the heat exchange medium input to the serpentine heat exchange medium circulation tube A102, the temperature of the heat exchange medium output from the serpentine heat exchange medium circulation tube A102, the flow rate of the heat exchange medium input to the serpentine heat exchange medium circulation tube A102, and the flow rate of the heat exchange medium output from the serpentine heat exchange medium circulation tube A102, the input end of the serpentine heat exchange medium circulation tube A102 is fixedly connected with the eighth solenoid valve 1021 and the eighth temperature detector 1022, and the output end of the serpentine heat exchange medium circulation tube A102 is fixedly connected with the ninth solenoid valve 1023 and the ninth temperature detector 1024.

[0044] Reference Figure 1 In order to accurately control the temperature of the heat exchange medium input to the heat exchange medium storage tank B4, the temperature of the heat exchange medium output from the heat exchange medium storage tank B4, and control the flow rate of the heat exchange medium output from the heat exchange medium storage tank B4, the liquid inlet end of the heat exchange medium storage tank B4 is fixedly connected with a second solenoid valve 41 and a second temperature detector 42. The liquid outlet end of the heat exchange medium storage tank B4 is fixedly connected with a third solenoid valve 43 and a third temperature detector 44.

[0045] Reference Figure 1 The heat recovery module B2 includes a plurality of heat recovery units B20 connected to the flash system 5 and the waste heat boiler 6. A single heat recovery unit B20 includes a heat exchanger B201 that directly contacts and exchanges heat with the hot steel coil and a serpentine heat exchange medium circulation pipe B202, one end of which is fixedly connected to the steam output end of the flash tank of the flash system 5 through a transmission pipe D73, and the other end of which is fixedly connected to the input end of the waste heat boiler 6 through a transmission pipe E74.

[0046] Reference Figure 1 In order to improve the heat recovery efficiency, the outer surface of the heat exchanger B201 is fixedly connected with a thermal conductive coating. The serpentine heat exchange medium circulation pipe B202 is a steel square pipe or a steel round pipe, and the outer wall of the serpentine heat exchange medium circulation pipe B202 is fixedly connected with a thermal insulation coating. The outer walls of the transmission pipes D73 and E74 are fixedly connected with a thermal insulation coating.

[0047] Reference Figure 1In order to accurately control the temperature of the heat exchange medium input into the flash tank of the flash evaporation system 5 and control the steam flow rate of the flash tank output from the flash evaporation system 5, the liquid inlet end of the flash evaporation system 5 is fixedly connected with the fourth solenoid valve 51 and the fourth temperature detector 52, and the steam output end of the flash evaporation system 5 is fixedly connected with the fifth solenoid valve 53 and the fifth temperature detector 54. The steam output end of the flash evaporation system 5 is fixedly connected with the input end of the serpentine heat exchange medium circulation pipe B202 by a transmission pipe D73. A booster pump is installed on the transmission pipe D73. The booster pump has an input end and two output ends. The input end of the booster pump is connected to the steam output end of the flash evaporation system 5. One output end of the booster pump is fixedly connected to the input end of the serpentine heat exchange medium circulation pipe B202 through the transmission pipe D73. The thirteenth solenoid valve 57 is installed on the transmission pipe D73 connected to one output end of the booster pump; the other output end of the booster pump is connected to the bottom of the flash tank of the flash evaporation system 5 through the transmission pipe F731. The transmission pipe F731 is fixedly connected to the bottom connection section of the flash tank of the flash system 5 with a twelfth solenoid valve 55 and a twelfth temperature detector 56. When the steam temperature detected by the fourth temperature detector 52 is lower than 158.8°C, the generated steam is transported back to the flash system 5 through the transmission pipe F731 to continue the flash treatment. When the steam temperature detected by the fourth temperature detector 52 is higher than 158.8°C, it is transported to the serpentine heat exchange medium circulation pipe B202 through the transmission pipe D73.

[0048] Reference Figure 1 In order to control the steam temperature of the input serpentine heat exchange medium circulation pipe B202, the steam temperature of the output input serpentine heat exchange medium circulation pipe B202, and the steam flow rate of the input serpentine heat exchange medium circulation pipe B202 and the steam flow rate of the output serpentine heat exchange medium circulation pipe B202, the input end of the serpentine heat exchange medium circulation pipe B202 is fixedly connected with the tenth solenoid valve 2021 and the tenth temperature detector 2022, and the output end of the serpentine heat exchange medium circulation pipe B202 is fixedly connected with the eleventh solenoid valve 2023 and the eleventh temperature detector 2024.

[0049] Reference Figure 1 In order to control the temperature of the steam input to the waste heat boiler 6 and the flow rate of the steam input to the waste heat boiler 6, the steam input end of the waste heat boiler 6 is fixedly connected with a sixth solenoid valve 61 and a sixth temperature detector 62. In order to control the temperature of the steam output from the waste heat boiler 6 and the flow rate of the steam output from the waste heat boiler 6, the steam output end of the waste heat boiler 6 is fixedly connected with a seventh solenoid valve 63 and a seventh temperature detector 64. The steam output from the steam C output end of the waste heat boiler 6 is used for power generation or drying or input into the steam network.

[0050] Reference Figure 2-3 The heat exchange component A101 is a rectangular steel plate and / or a cylindrical steel plate.

[0051] Reference Figure 2-3The heat exchange component B201 is a rectangular steel plate and / or a cylindrical steel plate.

[0052] Reference Figure 2 When the heat exchanger A101 is a rectangular steel plate, the serpentine heat exchange medium circulation pipe A102 is fixedly connected to the bottom surface of the heat exchanger A101. The bottom surface of the heat exchanger A101 is fixedly connected with an insulating support bar A103. The insulating support bar A103 is located between the gaps of the serpentine heat exchange medium circulation pipe A102. The two side ends of the heat exchanger A101 are fixedly connected with an I-beam A104.

[0053] Reference Figure 3 When the heat exchanger B201 is a rectangular steel plate, the serpentine heat exchange medium circulation pipe B202 is fixedly connected to the bottom surface of the heat exchanger B201. The bottom surface of the heat exchanger B201 is fixedly connected with an insulating support bar B203. The insulating support bar B203 is located between the gaps of the serpentine heat exchange medium circulation pipe B202. The two side ends of the heat exchanger B201 are fixedly connected with an I-beam B204.

[0054] Reference Figure 4 The heat exchanger A101 also includes a cylindrical steel plate, and the serpentine heat exchange medium flow pipe A102 is fixedly connected to a surface of the heat exchanger A101 (cylindrical steel plate) that is opposite to the contact surface of the hot steel coil. The heat exchanger A101 is moved to the outer surface of the hot steel coil by the mechanical arm on the gantry to abut against it.

[0055] Reference Figure 5 The heat exchanger B201 also includes a cylindrical steel plate, and the serpentine heat exchange medium flow pipe B202 is fixedly connected to a surface of the heat exchanger B201 that is opposite to the contact surface of the hot steel coil. The heat exchanger B201 is moved to the outer surface of the hot steel coil by the mechanical arm on the gantry to abut against it.

[0056] Reference Figure 6 The heat exchanger A101 is a cylindrical steel plate, and the serpentine heat exchange medium flow pipe A102 is fixedly connected to a surface of the heat exchanger A101 that is opposite to the contact surface of the hot steel coil. The heat exchanger A101 is moved to the outer surface of the hot steel coil by the mechanical arm on the gantry to abut against it.

[0057] Reference Figure 7 The heat exchanger B201 is a cylindrical steel plate, and the serpentine heat exchange medium flow pipe B202 is fixedly connected to a surface of the heat exchanger B201 that is opposite to the contact surface of the hot steel coil. The heat exchanger B201 is moved to the outer surface of the hot steel coil by the mechanical arm on the gantry to abut against it.

[0058] Reference Figure 1 The specific method of recovering heat from hot steel coils using the hot steel coil heat recovery equipment is as follows:

[0059] Step 1: The hot steel coils are transported and loaded onto the heat exchanger A101 of the heat recovery module A1 and the heat exchanger B201 of the heat recovery module B2, respectively, that is, the hot steel coils are in direct contact with the heat exchanger A101 and the hot steel coils are in direct contact with the heat exchanger B201;

[0060] Step 2: The heat exchange medium (temperature is recorded as T1) in the heat exchange medium storage tank A3 is pumped by a centrifugal pump and input into the serpentine heat exchange medium flow pipe A102 of the heat recovery module A1. The heat exchange medium (temperature is recorded as T2) flowing through the serpentine heat exchange medium flow pipe A102 is input into the heat exchange medium storage tank B4 for storage. The flow rate of the heat exchange medium is 0.5-2m / s. The built-in thermal compensator in the heat exchange medium storage tank B4 performs thermal adjustment on the stored heat exchange medium, so that the temperature of the heat exchange medium input into the flash evaporation system 5 is 175-200°C and the pressure is 1-2MPa (temperature is recorded as T3).

[0061] Step three, the high-temperature and high-pressure heat exchange medium (temperature is recorded as T3) with a temperature of 175-200°C and a pressure of 1-2MPa input into the heat exchange medium storage tank B4 is flash-evaporated by the flash evaporation system 5 to form steam A, and the steam pressure of the obtained steam A is 0.5-0.8MPa. Steam A flows through the serpentine heat exchange medium circulation pipe B202 under the action of the pressure pump. Steam A is converted into steam B under heat exchange in the serpentine heat exchange medium circulation pipe B202. The flow rate of steam A is 1-10m / s, and the steam pressure of steam B is 10-1.6MPa. The obtained steam B is input into the waste heat boiler 6, and the steam B is converted into steam C under the heating of the waste heat boiler 6. The steam pressure of steam C is ≥1.6MPa. The obtained steam C is used for power generation or drying or input into the steam network.

[0062] Preferably, scheme 1 is a method for recovering heat from hot steel coils using a hot steel coil heat recovery device, comprising the following steps:

[0063] Step 1: The hot steel coils are transported and loaded onto the heat exchanger A101 of the heat recovery module A1 and the heat exchanger B201 of the heat recovery module B2, respectively, that is, the hot steel coils are in direct contact with the heat exchanger A101 and the hot steel coils are in direct contact with the heat exchanger B201;

[0064] Step 2: The heat exchange medium (temperature is recorded as T1) in the heat exchange medium storage tank A3 is pumped by the centrifugal pump and input into the serpentine heat exchange medium circulation pipe A102 of the heat recovery module A1. The heat exchange medium (temperature is recorded as T2) flowing through the serpentine heat exchange medium circulation pipe A102 is input into the heat exchange medium storage tank B4 for storage. The flow rate of the heat exchange medium is 0.5-0.6 m / s. The built-in thermal compensator in the heat exchange medium storage tank B4 performs thermal adjustment on the stored heat exchange medium, so that the temperature of the heat exchange medium input into the flash evaporation system 5 is 200°C and the pressure is 2MPa (temperature is recorded as T3).

[0065] Step three, the high-temperature and high-pressure heat exchange medium with a temperature of 200°C and a pressure of 2MPa (temperature is recorded as T3) output from the heat exchange medium storage tank B4 is flash-treated by the flash evaporation system 5 to form steam A. The steam pressure of the obtained steam A is 0.75-0.80MPa. Steam A flows through the serpentine heat exchange medium circulation pipe B202 under the action of the pressure pump. Steam A is converted into steam B under heat exchange in the serpentine heat exchange medium circulation pipe B202. The flow rate of steam A is 6-8m / s, and the steam pressure of steam B is 1.5-1.6MPa. The obtained steam B is input into the waste heat boiler 6. Under the heating of the waste heat boiler 6, steam B is converted into steam C. The steam pressure of steam C is ≥1.6MPa. The obtained steam C is used for power generation or drying or input into the steam network.

[0066] Preferably, scheme 2 is a method for recovering heat from hot steel coils using a hot steel coil heat recovery device, comprising the following steps:

[0067] Step 1: The hot steel coils are transported and loaded onto the heat exchanger A101 of the heat recovery module A1 and the heat exchanger B201 of the heat recovery module B2, respectively, that is, the hot steel coils are in direct contact with the heat exchanger A101 and the hot steel coils are in direct contact with the heat exchanger B201;

[0068] Step 2: The heat exchange medium (temperature is recorded as T1) in the heat exchange medium storage tank A3 is pumped by a centrifugal pump and input into the serpentine heat exchange medium circulation pipe A102 of the heat recovery module A1. The heat exchange medium (temperature is recorded as T2) flowing through the serpentine heat exchange medium circulation pipe A102 is input into the heat exchange medium storage tank B4 for storage. The flow rate of the heat exchange medium is 1.8-2.0 m / s. The built-in thermal compensator in the heat exchange medium storage tank B4 performs thermal adjustment on the stored heat exchange medium, so that the temperature of the heat exchange medium input into the flash evaporation system 5 is 175°C and the pressure is 1MPa (temperature is recorded as T3).

[0069] Step three, the high-temperature and high-pressure heat exchange medium with a temperature of 175°C and a pressure of 1Pa (temperature is recorded as T3) output from the heat exchange medium storage tank B4 is flash-evaporated by the flash evaporation system 5 to form steam A. The steam pressure of the obtained steam A is 0.5-0.55MPa. Steam A flows through the serpentine heat exchange medium circulation pipe B202 under the action of the pressure pump. Steam A is converted into steam B under heat exchange in the serpentine heat exchange medium circulation pipe B202. The flow rate of steam A is 1-2m / s, and the steam pressure of steam B is 1.4-1.6MPa. The obtained steam B is input into the waste heat boiler 6. Under the heating of the waste heat boiler 6, steam B is converted into steam C. The steam pressure of steam C is ≥1.6MPa. The obtained steam C is used for power generation or drying or input into the steam network.

[0070] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A heat recovery device for hot steel coils, characterized in that: The invention comprises a heat recovery module A (1), a heat recovery module B (2), a heat exchange medium storage tank A (3), a heat exchange medium storage tank B (4), a flash evaporation system (5), and a waste heat boiler (6). The heat exchange medium stored in the heat exchange medium storage tank A (3) flows through the heat recovery module A (1) for heat exchange and is then input into the heat exchange medium storage tank B (4). The heat exchange medium in the heat exchange medium storage tank B (4) is input into the flash evaporation system (5) to generate steam A. The steam A input into the flash evaporation system (5) flows through the heat recovery module B (2) for heat exchange and obtains steam B. The obtained steam B is input into the waste heat boiler (6). The steam C output from the waste heat boiler (6) is used for power generation or drying or is input into a steam network.

2. The hot steel coil heat recovery device according to claim 1, characterized in that: The heat recovery module A (1) comprises a plurality of heat recovery units A (10), wherein the heat recovery units A (10) are connected to a heat exchange medium storage tank A (3) and a heat exchange medium storage tank B (4); a single heat recovery unit A (10) comprises a heat exchange component A (101) for directly exchanging heat with the hot steel coil and a serpentine heat exchange medium circulation pipe A (102), wherein one end of the serpentine heat exchange medium circulation pipe A (102) is connected to the heat exchange medium storage tank A (3) and the other end is connected to the heat exchange medium storage tank B (4).

3. The hot steel coil heat recovery device according to claim 2, characterized in that: The heat recovery module B (2) comprises a plurality of heat recovery units B (20), wherein the heat recovery units B (20) are connected to the flash evaporation system (5) and the waste heat boiler (6); the heat recovery units B (20) comprise a heat exchange component B (201) for directly exchanging heat with the hot steel coil and a serpentine heat exchange medium circulation pipe B (202), wherein one end of the serpentine heat exchange medium circulation pipe B (202) is connected to the flash tank of the flash evaporation system (5) and the other end is connected to the waste heat boiler (6).

4. The hot steel coil heat recovery device according to claim 3, characterized in that: The heat exchange component A (101) is a rectangular parallelepiped steel plate and / or a cylindrical steel plate; the heat exchange component B (201) is a rectangular parallelepiped steel plate and / or a cylindrical steel plate.

5. The hot steel coil heat recovery device according to claim 4, characterized in that: When the heat exchanger A (101) is a rectangular parallelepiped steel plate, the serpentine heat exchange medium circulation tube A (102) is fixedly connected to the bottom surface of the heat exchanger A (101); the bottom surface of the heat exchanger A (101) is fixedly connected with an insulating support bar A (103); the insulating support bar A (103) is located between the gaps of the serpentine heat exchange medium circulation tube A (102); when the heat exchanger B (201) is a rectangular parallelepiped steel plate, the serpentine heat exchange medium circulation tube B (202) is fixedly connected to the bottom surface of the heat exchanger B (201); the bottom surface of the heat exchanger B (201) is fixedly connected with an insulating support bar B (203); the insulating support bar B (203) is located between the gaps of the serpentine heat exchange medium circulation tube B (202).

6. The hot steel coil heat recovery device according to claim 5, characterized in that: The heat exchanger A (101) comprises an annular cylindrical steel plate, and the serpentine heat exchange medium circulation pipe A (102) is fixedly connected to a surface of the heat exchanger A (101) which faces away from the contact surface with the hot steel coil; the heat exchanger B (201) comprises an annular cylindrical steel plate, and the serpentine heat exchange medium circulation pipe B (202) is fixedly connected to a surface of the heat exchanger B (201) which faces away from the contact surface with the hot steel coil; the heat exchanger A (101) and the heat exchanger B (201) are respectively moved by a robot arm to abut against the outer surface of the hot steel coil.

7. The hot steel coil heat recovery device according to claim 3, characterized in that: The outer surfaces of the heat exchange component A (101) and the heat exchange component B (201) are fixedly connected with a thermal conductive coating; the serpentine heat exchange medium circulation pipe A (102) and the serpentine heat exchange medium circulation pipe B (202) are steel square pipes, and the outer walls of the serpentine heat exchange medium circulation pipe A (102) and the serpentine heat exchange medium circulation pipe B (202) are fixedly connected with a thermal insulation coating.

8. The hot steel coil heat recovery device according to claim 1, characterized in that: The liquid outlet of the heat exchange medium storage tank A (3) is fixedly connected to a first solenoid valve (31) and a first temperature detector (32); the liquid inlet of the heat exchange medium storage tank B (4) is fixedly connected to a second solenoid valve (41) and a second temperature detector (42); the liquid outlet of the heat exchange medium storage tank B (4) is fixedly connected to a third solenoid valve (43) and a third temperature detector (44); the liquid inlet of the flash evaporation system (5) is fixedly connected to a fourth solenoid valve (51) and a fourth temperature detector (52); the steam output of the flash evaporation system (5) is fixedly connected to a fifth solenoid valve (53) and a fifth temperature detector (54); the steam input of the waste heat boiler (6) is fixedly connected to a sixth solenoid valve (61) and a sixth temperature detector (62); the steam output of the waste heat boiler (6) is fixedly connected to a seventh solenoid valve (63) and a seventh temperature detector (64); the steam output of the steam output of the waste heat boiler (6) is used for power generation or drying or is input into a steam network.

9. The hot steel coil heat recovery device according to claim 3, characterized in that: The input end of the serpentine heat exchange medium circulation pipe A (102) is fixedly connected to an eighth solenoid valve (1021) and an eighth temperature detector (1022); the output end of the serpentine heat exchange medium circulation pipe A (102) is fixedly connected to a ninth solenoid valve (1023) and a ninth temperature detector (1024); the input end of the serpentine heat exchange medium circulation pipe B (202) is fixedly connected to a tenth solenoid valve (2021) and a tenth temperature detector (2022); the output end of the serpentine heat exchange medium circulation pipe B (202) is fixedly connected to an eleventh solenoid valve (2023) and an eleventh temperature detector (2024).

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