Metallurgical slag water quenching heat mass combined recovery system

Abstract

The utility model relates to a metallurgical slag water quenching heat mass combined recovery system. The metallurgical slag water quenching heat and mass combined recovery system comprises a heat exchanger, a flash tank, a high-temperature heat pump, a multi-effect evaporator and a condenser, the heat exchanger is provided with a first heat absorption side inlet and a first heat release side inlet, and the first heat release side inlet is used for being connected with a slag flushing steam source; the flash tank is provided with a flash water inlet, a flash water outlet and a flash steam outlet, and the flash water inlet is used for being connected with a slag flushing water source; the high-temperature heat pump is provided with a heat release inlet, a heat absorption liquid inlet and a heat absorption steam outlet, the heat release inlet communicates with the flash water outlet, and the heat absorption liquid inlet communicates with the first heat absorption side outlet; the multi-effect evaporator is provided with a steam inlet, a dead steam outlet, a first demineralized water outlet and a second demineralized water outlet, and the second demineralized water outlet communicates with the first heat absorption side inlet. The heat and mass combined recovery system is simple and has the advantages of being low in operation cost, high in waste heat utilization rate and small in seasonal and regional limitation.

Description

Technical Field

[0001] The utility model relates to the technical field of recycling low-grade waste heat resources, in particular to a metallurgical slag water quenching heat and mass combined recovery system. Background Art

[0002] Both iron and steel metallurgy and nonferrous metallurgy produce a large amount of slag during production. Currently, the slag is usually granulated by a water quenching process. During the process, a large amount of slag-washing hot water (70-90°C) and slag-washing steam (85-105°C) are generated, and the waste heat of the slag is transferred to the hot water and steam. For the waste heat carried in the slag-washing water and slag-washing steam, heating, cooling and low-temperature power generation are used in related technologies to recover the waste heat. However, heating is generally only used in the heating season in the north, and there are seasonal and regional restrictions. Although refrigeration is not restricted by seasons and regions, there is no good way to utilize the large amount of low-grade waste heat generated by refrigeration; low-temperature power generation has the problem of low thermal-to-electricity conversion efficiency.

[0003] Chinese patent 201410223236.1 proposes a blast furnace slag water quenching waste heat recovery system, which uses two low-temperature cooling waters to cool the slag water and steam respectively, and finally uses the cooling water that absorbs the waste heat for flash evaporation, low-temperature power generation or boiler primary feed water heating. The cooled slag water and steam condensate are returned to the slag system for recycling. This patent can recover slag steam and slag waste heat to achieve combined heat and mass recovery, but the waste heat grade will be further reduced after the cooling water recovers the waste heat, and the energy saving and benefits brought by the waste heat utilization method are limited. The blast furnace slag water quenching waste heat recovery system proposed in Chinese patent 202310402130.7 realizes the waste heat recovery of slag water and steam through heat pump and flash evaporation technology. The heat pump can provide both cold and hot, realize the continuous utilization of waste heat throughout the year, and overcome the seasonal or regional restrictions, but in the cooling mode, there is still a lot of heat discharged into the environment through the cooling tower. The blast furnace slag water waste heat recovery refrigeration system proposed in Chinese Patent 202310789709.3 uses the slag water as the driving heat source of the absorption refrigerator to provide cooling for the factory area, but the waste heat generated by the operation of the refrigerator is not effectively used, resulting in unsatisfactory waste heat utilization of the system. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the embodiment of the utility model proposes a metallurgical slag water quenching heat and mass combined recovery system, which is simple in system, has the advantages of low operating cost, high waste heat utilization rate, and little seasonal and regional restrictions.

[0005] A metallurgical slag water quenching heat and mass combined recovery system according to an embodiment of the utility model comprises a heat exchanger, a flash tank, a high-temperature heat pump, a multi-effect evaporator and a condenser, wherein the heat exchanger has a first heat absorption side inlet, a first heat absorption side outlet, a first heat release side inlet and a first heat release side outlet, wherein the first heat release side inlet is used to connect to a slag flushing steam source; the flash tank has a flash water inlet, a flash water outlet and a flash steam outlet, wherein the flash water inlet is used to connect to a slag flushing water source; the high-temperature heat pump has a heat release inlet, a heat release outlet, a heat absorption liquid inlet and a heat absorption steam outlet, wherein the heat release inlet is connected to the flash water outlet, and the heat absorption liquid inlet is connected to the first a heat absorption side outlet; the multiple-effect evaporator has a steam inlet, a water supply port, a return water port, an exhaust steam outlet, a first desalted water outlet and a second desalted water outlet, the heat absorption steam outlet and the flash steam outlet are both connected to the steam inlet, the first desalted water outlet is used to connect to downstream users, and the second desalted water outlet is connected to the first heat absorption side inlet; the condenser has a second heat absorption side inlet, a second heat absorption side outlet, a second heat release side inlet and a second heat release side outlet, the second heat absorption side inlet is used to connect to a water supply source, the second heat absorption side outlet is connected to the water supply port, and the second heat release side inlet is connected to the exhaust steam outlet.

[0006] The combined heat recovery system for water quenching of metallurgical slag in the embodiment of the utility model can jointly recover the calorific value of slag flushing water and slag flushing steam, reduce the steam emission of the water quenching system, and realize the deep recovery of the waste heat of the water quenching system. The temperature of the slag flushing water and slag flushing steam after the heat energy is recovered meets the temperature requirement of the water used in the water quenching process, and can be used as new water to supply water to the water quenching system, thereby reducing the consumption of new water in the water quenching system. At the same time, the combined heat recovery system for water quenching of metallurgical slag in the embodiment of the utility model uses the waste heat of slag flushing water and slag flushing steam to prepare desalted water. Desalted water is a necessary medium for metallurgical production and is used in large quantities. Therefore, the operation of the recovery system in the embodiment of the utility model is not restricted by seasons and regions, and can be used all year round. It also reduces the energy consumption of desalted water preparation and reduces the cost of preparing desalted water.

[0007] In some embodiments, the metallurgical slag water quenching heat and mass combined recovery system further includes a regenerator, the regenerator having a third heat absorption side inlet, a third heat absorption side outlet, a third heat release side inlet and a third heat release side outlet, the third heat absorption side inlet is connected to the second heat absorption side outlet, the third heat absorption side outlet is connected to the water supply port, and the third heat release side inlet is connected to the water return port.

[0008] In some embodiments, the regenerator is a partition-type heat exchanger, and / or the condenser is a partition-type heat exchanger, and / or the heat exchanger is a partition-type heat exchanger.

[0009] In some embodiments, the metallurgical slag water quenching heat and mass combined recovery system further includes a steam-water separator, which includes a mixture inlet, a condensed water outlet and a non-condensable gas outlet, and the mixture inlet is connected to the second heat release side outlet.

[0010] In some embodiments, the metallurgical slag water quenching heat and mass combined recovery system further includes a heater having a heating inlet and a heating outlet, wherein the heating inlet is connected to the first heat absorption side outlet, and the heating outlet is connected to the heat absorption liquid inlet.

[0011] In some embodiments, the heat release inlet includes a primary heat release inlet and a secondary heat release inlet, the heat release outlet includes a primary heat release outlet and a secondary heat release outlet, the primary heat release inlet is connected to the primary heat release outlet, the secondary heat release inlet is connected to the secondary heat release outlet, the primary heat release inlet is connected to the second desalted water outlet, the primary heat release outlet is used to connect to downstream users, and the secondary heat release inlet is connected to the flash outlet.

[0012] In some embodiments, the metallurgical slag water quenching heat and mass combined recovery system further includes a steam booster, the steam booster having a steam inlet and a steam outlet, the steam inlet being connected to the endothermic steam outlet, and the steam outlet being connected to the steam inlet.

[0013] In some embodiments, the metallurgical slag water quenching heat and mass combined recovery system further includes a steam jet heat pump, which has a high-temperature and high-pressure steam inlet, a low-temperature and low-pressure steam inlet and a mixed steam outlet, the high-temperature and high-pressure steam inlet is connected to the steam outlet, the low-temperature and low-pressure steam inlet is connected to the flash steam outlet, and the mixed steam outlet is connected to the steam inlet.

[0014] In some embodiments, the number of at least one of the heat exchanger, the flash tank, the high-temperature heat pump and the multiple-effect evaporator is three, two of which are in operation and one is in standby; or the number of at least one of the heat exchanger, the flash tank, the high-temperature heat pump and the multiple-effect evaporator is two, one of which is in operation and one is in standby.

[0015] The application method of the metallurgical slag water quenching heat mass combined recovery system of the utility model embodiment includes:

[0016] Supplying slag flushing steam to the first heat release side inlet of the heat exchanger, the heat exchanger recovers the heat energy of the slag flushing steam to initially heat the desalted water flowing through the heat exchanger, and the heated desalted water enters the high-temperature heat pump through the heat absorption liquid inlet for heating and evaporation;

[0017] Supplying slag flushing water to the flash evaporation water inlet of the flash evaporation tank, the temperature of the slag flushing water is reduced after flash evaporation in the flash evaporation tank, obtaining medium-temperature hot water and medium-temperature low-pressure steam, the medium-temperature hot water flows to the heat release inlet through the flash evaporation water outlet, the medium-temperature hot water enters the high-temperature heat pump through the heat release inlet for heat energy recovery, and the medium-temperature low-pressure steam flows to the steam inlet through the flash evaporation steam outlet;

[0018] Supplying produced water to the second heat absorption side inlet of the condenser, the condenser recovers the heat energy of the exhaust steam discharged from the exhaust steam outlet to heat the produced water flowing through the condenser, and the heated produced water flows to the water supply port of the multiple-effect evaporator;

[0019] The multiple-effect evaporator utilizes the steam discharged from the endothermic steam outlet and the flash steam outlet to prepare desalted water in combination with produced water, and simultaneously generates exhaust steam; a portion of the desalted water is supplied to downstream users via the first desalted water outlet, and a portion of the desalted water enters the system circulation.

[0020] The application method of the metallurgical slag water quenching heat and mass combined recovery system of the utility model embodiment has the advantages of low operating cost, high waste heat utilization rate, and little seasonal and regional restrictions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is one of the schematic diagrams of the combined heat and mass recovery system for water quenching of metallurgical slag according to the embodiment of the utility model;

[0022] Figure 2 This is the second schematic diagram of the metallurgical slag water quenching heat and mass combined recovery system according to an embodiment of the utility model.

[0023] Reference numerals:

[0024] Metallurgical slag water quenching heat mass combined recovery system 100;

[0025] Heat exchanger 1, first heat absorbing side inlet 11, first heat absorbing side outlet 12, first heat releasing side inlet 13, first heat releasing side outlet 14;

[0026] Flash tank 2, flash water inlet 21, flash water outlet 22, flash steam outlet 23;

[0027] High temperature heat pump 3, heat release inlet 31, primary heat release inlet 311, secondary heat release inlet 312, heat release outlet 32, primary heat release outlet 321, secondary heat release outlet 322, heat absorption liquid inlet 33, heat absorption steam outlet 34;

[0028] Multiple-effect evaporator 4, steam inlet 41, water supply inlet 42, water return inlet 43, exhaust steam outlet 44, first desalted water outlet 45, second desalted water outlet 46;

[0029] Condenser 5, second heat absorbing side inlet 51, second heat absorbing side outlet 52, second heat releasing side inlet 53, second heat releasing side outlet 54;

[0030] Regenerator 6, third heat absorbing side inlet 61, third heat absorbing side outlet 62, third heat releasing side inlet 63, third heat releasing side outlet 64;

[0031] Steam-water separator 7, mixture inlet 71, condensed water outlet 72, non-condensable gas outlet 73;

[0032] Heater 8, heating inlet 81, heating outlet 82;

[0033] Steam booster 9, steam inlet 91, steam outlet 92;

[0034] The steam jet heat pump 10 has a high-temperature and high-pressure steam inlet 101 , a low-temperature and low-pressure steam inlet 102 , and a mixed steam outlet 103 . DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0036] like Figure 1 and Figure 2 As shown, the metallurgical slag water quenching heat and mass combined recovery system 100 of the embodiment of the utility model includes a heat exchanger 1, a flash tank 2, a high-temperature heat pump 3, a multiple-effect evaporator 4 and a condenser 5.

[0037] The heat exchanger 1 has a first heat absorbing side inlet 11, a first heat absorbing side outlet 12, a first heat releasing side inlet 13 and a first heat releasing side outlet 14. The first heat releasing side inlet 13 is used to connect to the slag flushing steam source, and the first heat absorbing side inlet 11 is connected to the second desalted water outlet 46 of the multiple-effect evaporator 4. The slag flushing steam enters the heat exchanger 1 from the first heat releasing side inlet 13 and is discharged from the first heat releasing side outlet 14. The desalted water enters the heat exchanger 1 from the first heat absorbing side inlet 11 and is discharged from the first heat absorbing side outlet 12.

[0038] The flash tank 2 has a flash water inlet 21, a flash water outlet 22 and a flash steam outlet 23. The flash water inlet 21 is used to connect to a slag flushing water source.

[0039] The high temperature heat pump 3 has a heat release inlet 31 , a heat release outlet 32 ​​, a heat absorption liquid inlet 33 and a heat absorption steam outlet 34 . The heat release inlet 31 is connected to the flash water outlet 22 , and the heat absorption liquid inlet 33 is connected to the first heat absorption side outlet 12 .

[0040] The multiple-effect evaporator 4 has a steam inlet 41, a water supply inlet 42, a water return inlet 43, an exhaust steam outlet 44, a first desalted water outlet 45 and a second desalted water outlet 46. The endothermic steam outlet 34 and the flash steam outlet 23 are both connected to the steam inlet 41. The first desalted water outlet 45 is used to connect to downstream users, and the second desalted water outlet 46 is connected to the first endothermic side inlet 11.

[0041] The condenser 5 has a second heat absorption side inlet 51, a second heat absorption side outlet 52, a second heat release side inlet 53 and a second heat release side outlet 54. The second heat absorption side inlet 51 is used to connect to the production water source, the second heat absorption side outlet 52 is connected to the water supply port 42, and the second heat release side inlet 53 is connected to the exhaust steam outlet 44.

[0042] The application method of the metallurgical slag water quenching heat mass combined recovery system 100 of the utility model embodiment includes:

[0043] The slag-washing steam is supplied to the first heat-releasing side inlet 13 of the heat exchanger 1. The heat exchanger 1 recovers the heat energy of the slag-washing steam to initially heat the desalted water flowing through the heat exchanger 1. The heated desalted water enters the high-temperature heat pump 3 through the heat-absorbing liquid inlet 33 for heating and evaporation. The heat energy of the slag-washing steam is recovered to form condensed water (waste) from the first heat-releasing side outlet 14. Specifically, the temperature of the slag-washing steam entering the first heat-releasing side inlet 13 is 85-105°C, and the temperature of the condensed water discharged from the first heat-releasing side outlet 14 is 45-55°C. The condensed water temperature meets the water temperature required for the water quenching process and can be used as new water to supply water to the water quenching system.

[0044] The slag flushing water is supplied to the flash evaporation water inlet 21 of the flash tank 2. After the slag flushing water is flashed in the flash tank 2, the temperature is reduced to obtain medium-temperature hot water and medium-temperature low-pressure steam. The medium-temperature hot water flows to the heat release inlet 31 through the flash evaporation water outlet 22. The medium-temperature hot water enters the high-temperature heat pump 3 through the heat release inlet 31 for heat energy recovery, and the medium-temperature low-pressure steam flows to the steam inlet 41 through the flash steam outlet 23. Specifically, the temperature of the slag flushing water entering the flash evaporation water inlet 21 is 70-80°C, and the temperature of the slag flushing water discharged through the heat release outlet 32 ​​of the high-temperature heat pump 3 is 45-55°C. The temperature of the slag flushing water discharged from the heat release outlet 32 ​​meets the temperature of the water required for the water quenching process, and can be used as new water to supply water to the water quenching system.

[0045] The produced water is supplied to the second heat absorption side inlet 51 of the condenser 5 . The condenser 5 recovers the heat energy of the exhaust steam discharged from the exhaust steam outlet 44 to heat the produced water flowing through the condenser 5 . The heated produced water flows to the water supply port 42 of the multiple-effect evaporator 4 .

[0046] The multiple-effect evaporator 4 uses the steam discharged from the endothermic steam outlet 34 and the flash steam outlet 23 to prepare demineralized water in combination with produced water, and generates exhaust steam at the same time. A portion of the demineralized water is supplied to downstream users through the first demineralized water outlet 45, and a portion of the demineralized water enters the metallurgical slag water quenching heat and mass combined recovery system 100 for circulation. The multiple-effect evaporator 4 uses the thermal energy of steam to evaporate and concentrate the produced water, and uses the condensed water formed after the steam is condensed step by step to prepare demineralized water, and generates return water and exhaust steam at the same time.

[0047] It should be noted that the slag flushing water and slag flushing steam have been preliminarily processed before entering the recovery system 100, and most of the particulate matter in the slag flushing water and slag flushing steam has been removed.

[0048] The metallurgical slag water quenching heat and mass recovery system 100 of the embodiment of the utility model prepares desalted water from production water through a multiple-effect evaporator 4, wherein the exhaust steam generated by preparing the desalted water flows through a condenser 5, and the condenser 5 exchanges heat between the exhaust steam and the production water, not only recovering the waste heat of the exhaust steam, but also preliminarily raising the temperature of the production water, thereby reducing the energy consumption of the multiple-effect evaporator 4 in preparing the desalted water. A portion of the desalted water produced by the multiple-effect evaporator 4 is supplied to downstream users through the first desalted water outlet 45, and a portion of the desalted water enters the metallurgical slag water quenching heat and mass recovery system 100. The heat exchanger 1 recovers the heat energy of the slag flushing steam to heat the desalted water entering the recovery system 100, the flash tank 2 converts the slag flushing water into medium-temperature hot water and medium-temperature low-pressure steam, the high-temperature heat pump 3 heats and evaporates the desalted water to form high-temperature low-pressure steam, and the high-temperature heat pump 3 recovers the heat energy of the medium-temperature hot water, thereby reducing the energy consumption of the high-temperature heat pump 3 in heating the desalted water. After the medium-temperature low-pressure steam generated by the flash tank 2 and the high-temperature low-pressure steam generated by the high-temperature heat pump 3 enter the multi-effect evaporator 4 for utilization, their thermal energy participates in evaporation and concentration to produce water, and the condensed water formed after the thermal energy is consumed participates in the preparation of desalted water, thereby realizing the recovery of the thermal energy and substances of the steam, and realizing the recovery of the thermal energy and substances of a part of the slag flushing water by the recovery system 100.

[0049] Therefore, the combined heat recovery system 100 and application method of the metallurgical slag water quenching heat and mass recovery system 100 of the embodiment of the utility model can recover the heat and mass of the slag flushing water and slag flushing steam, reduce the steam emission of the water quenching system, and achieve deep recovery of the waste heat of the water quenching system. The temperature of the slag flushing water and slag flushing steam after the heat energy is recovered meets the temperature requirement of the water used in the water quenching process, and can be used as new water to supply water to the water quenching system, thereby reducing the consumption of new water in the water quenching system. At the same time, the combined heat recovery system 100 of the metallurgical slag water quenching heat and mass recovery system 100 of the embodiment of the utility model uses the waste heat of the slag flushing water and slag flushing steam to prepare desalted water. Desalted water is a necessary medium for metallurgical production and is used in large quantities. Therefore, the operation of the recovery system 100 of the embodiment of the utility model is not restricted by seasons and regions, and can be used all year round. It also reduces the energy consumption of desalted water preparation and reduces the cost of preparing desalted water.

[0050] Therefore, the metallurgical slag water quenching heat and mass combined recovery system 100 of the embodiment of the utility model is simple, and has the advantages of low operating cost, high waste heat utilization rate, and little seasonal and regional restrictions.

[0051] In order to make the solution of the present application easier to understand, taking the temperature of the slag flushing steam entering the metallurgical slag water quenching heat mass combined recovery system 100 of the present utility model embodiment as 95°C and the temperature of the slag flushing water as 80°C as an example, refer to Figure 1 and Figure 2 , the metallurgical slag water quenching heat mass combined recovery system 100 and application method of the embodiment of the utility model are described in detail.

[0052] The metallurgical slag water quenching heat and mass combined recovery system 100 of the embodiment of the utility model includes a multiple-effect evaporator 4, a regenerator 6, a condenser 5, a steam-water separator 7, a heat exchanger 1, a heater 8, a flash tank 2, a high-temperature heat pump 3, a steam booster 9 and a steam jet heat pump 10.

[0053] The multiple-effect evaporator 4 has a steam inlet 41, a water supply port 42, a water return port 43, an exhaust steam outlet 44, a first desalted water outlet 45, and a second desalted water outlet 46. The endothermic steam outlet 34 and the flash steam outlet 23 are both connected to the steam inlet 41. The multiple-effect evaporator 4 prepares desalted water at 50°C, the first desalted water outlet 45 is connected to the downstream user to supply 50°C desalted water to the downstream user, the second desalted water outlet 46 is connected to the first endothermic side inlet 11, and the exhaust steam outlet 44 is connected to the second exothermic side inlet 53 of the condenser 5.

[0054] Specifically, the multi-effect evaporator 4 is a triple-effect evaporator.

[0055] Specifically, the pipes provided at the first desalted water outlet 45 and the second desalted water outlet 46 are made of stainless steel pipes, and a heat-insulating material layer is provided on the outside of the pipes. An underground pipe or a ground pipe can be selected according to site needs.

[0056] The condenser 5 has a second heat absorption side inlet 51, a second heat absorption side outlet 52, a second heat release side inlet 53 and a second heat release side outlet 54. The second heat absorption side inlet 51 is used to connect to the production water source, the second heat absorption side outlet 52 is connected to the water supply port 42, and the second heat release side inlet 53 is connected to the exhaust steam outlet 44. In this embodiment, the temperature of the production water entering the second heat absorption side inlet 51 is 20°C. After the exhaust steam passes through the condenser 5, a gas-water mixture of 30°C is formed and discharged from the second heat release side outlet 54. The condenser 5 uses the exhaust steam discharged from the multiple-effect evaporator 4 to initially heat the production water, which not only recovers the waste heat of the exhaust steam, but also increases the temperature of the production water entering the multiple-effect evaporator 4, and reduces the heat energy required for the multiple-effect evaporator 4 to prepare desalted water, thereby further reducing the operating cost and energy consumption of the recovery system 100, and also reducing the amount of steam discharged to the outside in the form of exhaust steam from the recovery system 100, that is, reducing the amount of steam discharged to the outside by the recovery system 100.

[0057] The steam-water separator 7 includes a mixture inlet 71, a condensed water outlet 72 and a non-condensable gas outlet 73. The mixture inlet 71 is connected to the second heat release side outlet 54. The gas-water mixture at 30°C enters the steam-water separator 7 through the mixture inlet 71, and forms non-condensable gas at 30°C and condensed water at 30°C after passing through the steam-water separator 7. The non-condensable gas is discharged to the atmosphere from the non-condensable gas outlet 73, and the condensed water is discharged from the condensed water outlet 72 for use by downstream users. The steam-water separator 7 separates the condensed exhaust steam into gas and water, so as to facilitate the downstream recovery of liquid water after the exhaust steam condensation.

[0058] The regenerator 6 has a third heat absorption side inlet 61, a third heat absorption side outlet 62, a third heat release side inlet 63 and a third heat release side outlet 64. The third heat absorption side inlet 61 is connected to the second heat absorption side outlet 52, the third heat absorption side outlet 62 is connected to the water supply port 42, and the third heat release side inlet 63 is connected to the water return port 43. After the production water is preliminarily heated by the condenser 5, it enters the regenerator 6 through the third heat absorption side inlet 61. The high-temperature water discharged from the multi-effect evaporator 4 through the water return port 43 enters the regenerator 6 through the third heat release side inlet 63. The high-temperature water transfers heat to the production water, heating the production water for the second time. After the production water is heated, it is discharged to the water supply port 42 of the multi-effect evaporator 4 through the third heat absorption side outlet 62. The temperature of the high-temperature water drops to 40°C and is discharged from the third heat release side outlet 64 to form 40°C production water return water. The provision of the regenerator 6 realizes the recovery of waste heat of the return water, further increases the temperature of the produced water, and further reduces the heat energy required for the multi-effect evaporator 4 to prepare desalted water, thereby further reducing the operating cost and energy consumption of the recovery system 100.

[0059] In some embodiments, the regenerator 6 adopts a partitioning heat exchanger 1, and the condenser 5 adopts a partitioning heat exchanger 1. For example, the regenerator 6 and the condenser 5 both adopt a tube-type or plate-type partitioning heat exchanger 1.

[0060] Specifically, the regenerator 6 and the condenser 5 both adopt plate-type partition-wall heat exchangers 1 .

[0061] The heat exchanger 1 has a first heat absorbing side inlet 11, a first heat absorbing side outlet 12, a first heat releasing side inlet 13 and a first heat releasing side outlet 14. The first heat releasing side inlet 13 is used to connect to the slag flushing steam source, and the first heat absorbing side inlet 11 is connected to the second desalted water outlet 46 of the multiple-effect evaporator 4. The 95°C slag flushing steam enters the heat exchanger 1 from the first heat releasing side inlet 13, and the heat exchanger 1 recovers the waste heat of the slag flushing steam to form 50°C condensed water (waste), which is discharged from the first heat releasing side outlet 14 and recycled to the water quenching system. The 50°C desalted water enters the heat exchanger 1 from the first heat absorbing side inlet 11, and the heat exchanger 1 uses the recovered heat energy to initially heat the desalted water, and then discharges it from the first heat absorbing side outlet 12.

[0062] Specifically, the heat exchanger 1 adopts a tubular or plate-type partition-type heat exchanger 1, and the heat exchange material adopts a metal acid-resistant material, a non-metal acid-resistant material or a composite acid-resistant material. For example, 316 stainless steel and a metal acid-resistant material of a nickel-based alloy, a non-metal acid-resistant material of a ceramic, and a composite acid-resistant material of a glass fiber reinforced plastic. Preferably, the heat exchange material of the heat exchanger 1 adopts a metal acid-resistant material.

[0063] The heater 8 has a heating inlet 81 and a heating outlet 82. The heating inlet 81 is connected to the first heat absorbing side outlet 12, and the heating outlet 82 is connected to the heat absorbing liquid inlet 33. The desalted water initially heated by the heat exchanger 1 enters the heater 8, and the heater 8 performs secondary heating on the desalted water to form desalted water at 95°C, which is then discharged from the heating outlet 82.

[0064] Specifically, the heater 8 adopts a heating method of waste heat heating, electric heating or combustion heating. Preferably, the heater 8 adopts a waste heat heating method.

[0065] The heater 8 can heat the desalted water in a variety of ways. The heater 8 heats the desalted water into high-temperature desalted water, which helps to ensure the heating and evaporation efficiency of the desalted water by the downstream high-temperature heat pump 3.

[0066] The flash tank 2 has a flash water inlet 21, a flash water outlet 22 and a flash steam outlet 23. The flash water inlet 21 is used to connect to the slag flushing water source. After the 80°C slag flushing water is flashed in the flash tank 2, 60°C medium-temperature hot water and 60°C medium-temperature low-pressure steam are obtained. The 60°C medium-temperature hot water is discharged from the flash water outlet 22, and the 60°C medium-temperature low-pressure steam is discharged from the flash steam outlet 23. The flash tank 2 converts the high-temperature slag flushing water into medium-temperature hot water and medium-temperature low-pressure steam, so that the equipment downstream of the flash tank 2 can recover and utilize the heat energy of the medium-temperature hot water and medium-temperature low-pressure steam.

[0067] The high temperature heat pump 3 has a heat release inlet 31, a heat release outlet 32, a heat absorption liquid inlet 33 and a heat absorption steam outlet 34. The heat release inlet 31 is connected to the flash evaporation water outlet 22, and the heat absorption liquid inlet 33 is connected to the heating outlet 82. The 60°C medium temperature hot water enters the high temperature heat pump 3 through the heat release inlet 31, and the 95°C desalted water enters the high temperature heat pump 3 through the heat absorption liquid inlet 33. The high temperature heat pump 3 recovers the waste heat of the medium temperature hot water, and uses the waste heat to heat and evaporate the 95°C desalted water to form 120°C steam, which is discharged through the heat absorption steam outlet 34.

[0068] Further, the heat release inlet 31 includes a primary heat release inlet 311 and a secondary heat release inlet 312, and the heat release outlet 32 ​​includes a primary heat release outlet 321 and a secondary heat release outlet 322. The primary heat release inlet 311 is connected to the primary heat release outlet 321, and the secondary heat release inlet 312 is connected to the secondary heat release outlet 322. The primary heat release inlet 311 is connected to the second desalted water outlet 46. The primary heat release outlet 321 is used to connect to downstream users, and the secondary heat release inlet 312 is connected to the flash evaporation outlet 22. Part of the 50°C desalted water discharged from the second desalted water outlet 46 enters the heat exchanger 1, and part enters the high-temperature heat pump 3 through the primary heat release inlet 311. The high-temperature heat pump 3 recovers the waste heat of the 50°C desalted water and forms 40°C desalted water. The 40°C desalted water is discharged through the primary heat release outlet 321 and supplied to downstream users. The high-temperature heat pump 3 not only recovers the heat energy of 50°C desalted water, reducing the heat energy required for heating and evaporating 95°C desalted water, but also prepares 40°C desalted water, thereby improving the specifications of the desalted water prepared by the recovery system 100.

[0069] Specifically, the high temperature heat pump 3 has a double evaporator, a multi-stage compressor and a heat pump condenser. The double evaporator includes a primary evaporator and a secondary evaporator. The heat absorption side pipeline of the primary evaporator and the heat absorption side pipeline of the secondary evaporator are connected in series. The heat release side pipeline of the primary evaporator has a primary heat release inlet 311 and a primary heat release outlet 321, and the heat release side pipeline of the secondary evaporator has a secondary heat release inlet 312 and a secondary heat release outlet 322. The primary evaporator and the secondary evaporator are turned on at the same time. The primary evaporator recovers the waste heat of the 50°C desalted water from a part of the second desalted water outlet 46. The desalted water is cooled to 40°C and then used by the user. The secondary evaporator recovers the waste heat of the 60°C medium-temperature hot water from the flash evaporation outlet 22 of the flash tank. The medium-temperature hot water is cooled to 50°C and then recycled to the water quenching system for recycling. The liquid working fluid of the high temperature heat pump 3 passes through the heat absorption side pipeline of the primary evaporator and the heat absorption side pipeline of the secondary evaporator in turn, and is heated and evaporated into a gaseous working fluid by the recovered waste heat. The heat pump condenser has a heat absorbing liquid inlet 33, a heat absorbing steam outlet 34 and a heat releasing pipeline. The gaseous working medium discharged from the outlet of the heat absorbing side pipeline of the secondary evaporator enters the heat releasing pipeline of the heat pump condenser after being pressurized and heated by the compressor. The gaseous working medium transfers heat to the 95°C high-temperature desalted water discharged from the heater 8 through condensation and heats the desalted water into 120°C high-temperature low-pressure steam.

[0070] Specifically, the working fluid of the high temperature heat pump 3 can be NH3, CO2, HFC236ea, HFC245ca or HFC245fa, and the compressor can be centrifugal, scroll or screw type, and can be installed in one, two or three stages.

[0071] Preferably, the working fluid is HFC236ea and the compressor is a two-stage screw type.

[0072] The steam booster 9 has a steam inlet 91 and a steam outlet 92. The steam inlet 91 is connected to the heat absorbing steam outlet 34, and the steam outlet 92 is connected to the steam inlet 41. The high-temperature low-pressure steam of 120°C discharged from the high-temperature heat pump 3 enters the steam booster 9 through the air inlet. The steam booster 9 boosts the pressure and temperature of the 120°C steam to obtain high-temperature and high-pressure steam.

[0073] Specifically, the steam booster 9 is a centrifugal steam booster, a reciprocating steam booster, a screw steam booster, etc., and can be installed in one or two stages.

[0074] Preferably, the steam booster 9 is a two-stage centrifugal steam booster.

[0075] The steam jet heat pump 10 has a high-temperature and high-pressure steam inlet 101, a low-temperature and low-pressure steam inlet 102 and a mixed steam outlet 103. The high-temperature and high-pressure steam inlet 101 is connected to the steam outlet 92, the low-temperature and low-pressure steam inlet 102 is connected to the flash steam outlet 23, and the mixed steam outlet 103 is connected to the steam inlet 41. The high-temperature and high-pressure steam discharged from the steam booster 9 is introduced into the high-temperature and high-pressure steam inlet 101, and the 60°C medium-temperature and low-pressure steam discharged from the outlet of the flash tank 2 is introduced into the low-temperature and low-pressure steam inlet 102. The two streams of steam are mixed and finally discharged from the mixed steam outlet 103. The mixed steam is about 150°C and 0.5MPa. The mixed steam discharged from the mixed steam outlet 103 enters the multiple-effect evaporator 4 through the steam inlet 41, and serves as one of the heat sources and water sources for preparing desalted water in the multiple-effect evaporator 4.

[0076] The steam jet heat pump 10 utilizes the pressure difference between the high-temperature and high-pressure steam prepared by the steam booster 9 and the 60°C medium-temperature and low-pressure steam separated from the flash tank 2 to improve the quality of the 60°C medium-temperature and low-pressure steam and recover the pressure difference, and mixes the two steams, thereby improving the convenience of the multiple-effect evaporator 4 in utilizing the waste heat of the medium-temperature and low-pressure steam formed by the 80°C slag flushing water to recover the waste heat, and improving the recovery efficiency of the recovery system 100 for the waste heat of the slag flushing water.

[0077] In some embodiments, the number of at least one of the heat exchanger 1, the flash tank 2, the high-temperature heat pump 3 and the multiple-effect evaporator 4 is three, and a two-in-one layout is adopted to operate in turns, so that the standby equipment can complete maintenance, cleaning, descaling and troubleshooting when it is shut down, thereby facilitating the completion of maintenance, cleaning, descaling and troubleshooting of at least one of the heat exchanger 1, the flash tank 2, the high-temperature heat pump 3 and the multiple-effect evaporator 4; or the number of at least one of the heat exchanger 1, the flash tank 2, the high-temperature heat pump 3 and the multiple-effect evaporator 4 is two, and a two-in-one layout is adopted to operate in turns.

[0078] A portion of the slag flushing water and slag flushing steam generated by the water quenching system enters the cooling tower and condenser 5 for cooling treatment and circulation for slag flushing, and the other portion enters this system. The proportion of the water entering the circulation for slag flushing and the proportion of the steam entering this system needs to be dynamically adjusted according to the on-site needs of the cooling water quenching system, so as to ensure the normal and stable operation of the slag flushing cycle of the water quenching system.

[0079] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0080] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0081] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0082] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0083] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0084] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A metallurgical slag water quenching heat mass combined recovery system (100), characterized in that: include: A heat exchanger (1), the heat exchanger (1) having a first heat absorbing side inlet (11), a first heat absorbing side outlet (12), a first heat releasing side inlet (13) and a first heat releasing side outlet (14), wherein the first heat releasing side inlet (13) is used for connecting to a slag flushing steam source; A flash tank (2), wherein the flash tank (2) has a flash water inlet (21), a flash water outlet (22) and a flash steam outlet (23), wherein the flash water inlet (21) is used to connect to a slag flushing water source; A high-temperature heat pump (3), the high-temperature heat pump (3) comprising a heat release inlet (31), a heat release outlet (32), a heat absorption liquid inlet (33) and a heat absorption steam outlet (34), the heat release inlet (31) being in communication with the flash evaporation water outlet (22), and the heat absorption liquid inlet (33) being in communication with the first heat absorption side outlet (12); A multiple-effect evaporator (4), the multiple-effect evaporator (4) having a steam inlet (41), a water supply inlet (42), a water return inlet (43), an exhaust steam outlet (44), a first desalted water outlet (45) and a second desalted water outlet (46), the endothermic steam outlet (34) and the flash steam outlet (23) both being in communication with the steam inlet (41), the first desalted water outlet (45) being used for communication with a downstream user, and the second desalted water outlet (46) being in communication with the first endothermic side inlet (11); A condenser (5), the condenser (5) having a second heat absorbing side inlet (51), a second heat absorbing side outlet (52), a second heat releasing side inlet (53) and a second heat releasing side outlet (54), the second heat absorbing side inlet (51) being used to connect to a water supply source, the second heat absorbing side outlet (52) being in communication with the water supply port (42), and the second heat releasing side inlet (53) being in communication with the exhaust steam outlet (44).

2. The metallurgical slag water quenching heat and mass combined recovery system (100) according to claim 1, characterized in that: The invention further comprises a regenerator (6), wherein the regenerator (6) has a third heat absorbing side inlet (61), a third heat absorbing side outlet (62), a third heat releasing side inlet (63) and a third heat releasing side outlet (64), wherein the third heat absorbing side inlet (61) is connected to the second heat absorbing side outlet (52), the third heat absorbing side outlet (62) is connected to the water supply port (42), and the third heat releasing side inlet (63) is connected to the water return port (43).

3. The metallurgical slag water quenching heat and mass combined recovery system (100) according to claim 2 is characterized in that: The regenerator (6) adopts a partition-type heat exchanger (1), and / or the condenser (5) adopts a partition-type heat exchanger (1), and / or the heat exchanger (1) adopts a partition-type heat exchanger (1).

4. The metallurgical slag water quenching heat and mass combined recovery system (100) according to claim 1, characterized in that: It further comprises a steam-water separator (7), the steam-water separator (7) comprising a mixture inlet (71), a condensed water outlet (72) and a non-condensable gas outlet (73), and the mixture inlet (71) is in communication with the second heat release side outlet (54).

5. The metallurgical slag water quenching heat and mass combined recovery system (100) according to claim 1, characterized in that: The invention further comprises a heater (8), wherein the heater (8) has a heating inlet (81) and a heating outlet (82), wherein the heating inlet (81) is connected to the first heat absorbing side outlet (12), and the heating outlet (82) is connected to the heat absorbing liquid inlet (33).

6. The metallurgical slag water quenching heat and mass combined recovery system (100) according to claim 1, characterized in that: The heat release inlet (31) comprises a primary heat release inlet (311) and a secondary heat release inlet (312); the heat release outlet (32) comprises a primary heat release outlet (321) and a secondary heat release outlet (322); the primary heat release inlet (311) is in communication with the primary heat release outlet (321); the secondary heat release inlet (312) is in communication with the secondary heat release outlet (322); the primary heat release inlet (311) is in communication with the second desalted water outlet (46); the primary heat release outlet (321) is used to be in communication with a downstream user; the secondary heat release inlet (312) is in communication with the flash water outlet (22).

7. The metallurgical slag water quenching heat and mass combined recovery system (100) according to claim 1, characterized in that: It further comprises a steam booster (9), the steam booster (9) having a steam inlet (91) and a steam outlet (92), the steam inlet (91) being connected to the endothermic steam outlet (34), and the steam outlet (92) being connected to the steam inlet (41).

8. The metallurgical slag water quenching heat and mass combined recovery system (100) according to claim 7, characterized in that: The invention further comprises a steam jet heat pump (10), wherein the steam jet heat pump (10) has a high-temperature and high-pressure steam inlet (101), a low-temperature and low-pressure steam inlet (102) and a mixed steam outlet (103), wherein the high-temperature and high-pressure steam inlet (101) is connected to the steam outlet (92), the low-temperature and low-pressure steam inlet (102) is connected to the flash steam outlet (23), and the mixed steam outlet (103) is connected to the steam inlet (41).

9. The metallurgical slag water quenching heat and mass combined recovery system (100) according to claim 1, characterized in that: The number of at least one of the heat exchanger (1), the flash tank (2), the high-temperature heat pump (3) and the multiple-effect evaporator (4) is three, two of which are in operation and one is in standby; or the number of at least one of the heat exchanger (1), the flash tank (2), the high-temperature heat pump (3) and the multiple-effect evaporator (4) is two, one of which is in operation and one is in standby.

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