Waste heat substance combined recovery system of metallurgical slag water quenching process

Abstract

The utility model relates to a waste heat substance combined recovery system for a metallurgical slag water quenching process. The recovery system comprises a heat exchanger, a flash tank, a steam booster and a multi-effect evaporator, a first heat release side inlet of the heat exchanger is used for being connected with a slag flushing steam source, a flash water inlet of the flash tank is used for being connected with a slag flushing water source, and the steam booster is provided with a first steam inlet and a first steam outlet. A first heat absorption side outlet of the heat exchanger and / or a flash steam outlet of the flash tank are / is communicated with the first steam inlet, and the first steam outlet is used for being communicated with a downstream steam user; the first heat absorption side outlet and / or the flash steam outlet are / is communicated with a second steam inlet of the multi-effect evaporator, and a second demineralized water outlet of the multi-effect evaporator is communicated with a first heat absorption side inlet of the heat exchanger. According to the recovery system, recovery of waste heat and substances of slag flushing steam and slag flushing water is achieved, the waste heat recovery efficiency is improved, the steam discharge amount is reduced, the operation cost is low, and the flexibility of waste heat recovery of the water quenching technology is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy saving and emission reduction in metallurgical production and lowering new water consumption, in particular to a waste heat material combined recovery system of a metallurgical slag water quenching process. Background Art

[0002] High-temperature slag is a typical by-product of metallurgical production, and water quenching is a commonly used slag granulation treatment technology. Taking blast furnace slag as an example, every ton of molten iron produced will produce about 350 kg of slag, carrying heat energy equivalent to about 22.4 kg of standard coal. Water quenching will produce slag flushing water of about 80°C and slag flushing steam of about 95°C.

[0003] Due to the characteristics of the water quenching process, a large amount of high-temperature slag flushing water (recycled water) and slag flushing steam (containing impurities) will be generated, and there are still many problems that need to be overcome and avoided in the recovery of waste heat. Taking the blast furnace slag water quenching data as an example, the main problems include: (1) The steam emission is large. Every ton of slag processed requires 8 tons of cooling water, of which 0.65 tons will be discharged in the form of steam. The recovery of slag flushing steam is relatively small in related technologies; (2) The waste heat recovery rate is low. After the blast furnace slag is water quenched, the heat energy transferred to the slag flushing water and slag flushing steam accounts for 10% and 80% respectively. However, the current technology mainly recovers the waste heat of slag flushing water, and the waste heat of steam is basically wasted. There is a lack of technology that can flexibly recover slag flushing water and steam; (3) The waste heat recovery technology of slag flushing water The technology is mainly used for waste heat heating or hot water supply, which has serious seasonal and regional restrictions and is limited to application scenarios in the south or non-heating season; (4) Most of the other water quenching waste heat recovery technologies have limited waste heat recovery rates, and the large number of equipment leads to high costs, poor flexibility, and relatively single product uses; (5) The slag flushing water has poor quality, is easy to scale and has certain corrosiveness, and is not friendly to the heat exchanger (1) pipeline; (6) The slag flushing steam contains a large amount of impurities such as H2S and SO2. The traditional water spray condensation method will waste waste heat quality, consume a large amount of new water, and have a low waste heat recovery rate. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art to at least a certain extent. To this end, the embodiment of the utility model proposes a waste heat and material joint recovery system for the metallurgical slag water quenching process, which realizes the recovery of waste heat and materials of slag flushing steam and slag flushing water generated by the water quenching process, improves the waste heat recovery efficiency, reduces steam emissions, has low operating costs, has good applicability for waste heat and material recovery, reduces the energy consumption of desalted water and steam product preparation, reduces the cost of preparing desalted water and steam products, and improves the flexibility of waste heat recovery of water quenching technology.

[0005] The waste heat material combined recovery system of the metallurgical slag water quenching process of the utility model embodiment includes:

[0006] A heat exchanger, wherein the heat exchanger has a first heat absorbing side inlet, a first heat absorbing side outlet, a first heat releasing side inlet and a first heat releasing side outlet, wherein the first heat releasing side inlet is used to connect to a slag flushing steam source;

[0007] A flash tank, wherein the flash tank has a flash water inlet, a flash water outlet and a flash steam outlet, and the flash water inlet is used to connect to a slag flushing water source;

[0008] A steam booster, the steam booster having a first steam inlet and a first steam outlet, at least one of the first heat absorption side outlet and the flash steam outlet being in communication with the first steam inlet, and the first steam outlet being in communication with a downstream steam user;

[0009] A multiple-effect evaporator, the multiple-effect evaporator having a second steam inlet, a water supply inlet, a water return inlet, an exhaust steam outlet, a first desalted water outlet and a second desalted water outlet, at least one of the first heat absorption side outlet and the flash steam outlet is in communication with the second steam inlet, the first desalted water outlet is used to connect to a downstream desalted water user, and the second desalted water outlet is in communication with the first heat absorption side inlet; and

[0010] A regenerator, wherein the regenerator 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, wherein the second heat absorption side inlet is used to connect to a production water 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.

[0011] The waste heat and material combined recovery system of the metallurgical slag water quenching process in the embodiment of the utility model realizes the recovery of waste heat and materials of the slag flushing steam and slag flushing water generated in the water quenching process, improves the waste heat recovery efficiency, reduces steam emissions, has low operating costs, has good applicability for waste heat and material recovery, reduces the energy consumption in the preparation of desalted water and steam products, reduces the cost of preparing desalted water and steam products, and improves the flexibility of waste heat recovery of water quenching technology.

[0012] In some embodiments, the waste heat material combined recovery system of the metallurgical slag water quenching process further includes a foam collector, which has a first slag flushing steam inlet and a first slag flushing steam outlet, the first slag flushing steam inlet is used to connect to a slag flushing steam source, and the first slag flushing steam outlet is connected to the first heat release side inlet.

[0013] In some embodiments, the waste heat material combined recovery system of the metallurgical slag water quenching process further includes a steam washing tower, which has a second slag flushing steam inlet and a second slag flushing steam outlet, the second slag flushing steam inlet is connected to the first slag flushing steam outlet, and the second slag flushing steam outlet is connected to the first heat release side inlet.

[0014] In some embodiments, the steam scrubbing tower has a scrubbing liquid inlet and a scrubbing liquid outlet, and the waste heat material joint recovery system further includes a preheater, the preheater has a heating inlet and a heating outlet, the heating inlet is connected to the scrubbing liquid outlet, and the heating outlet is connected to the scrubbing liquid inlet.

[0015] In some embodiments, the waste heat material joint recovery system of the metallurgical slag water quenching process further includes a first vacuum pump, the first vacuum pump having a third steam inlet and a third steam outlet, the third steam inlet is connected to the first heat absorption side outlet, the third steam outlet and at least one of the flash steam outlet are connected to the first steam inlet, and at least one of the third steam outlet and the flash steam outlet is connected to the second steam inlet.

[0016] In some embodiments, the waste heat material combined recovery system of the metallurgical slag water quenching process further includes a heater having a fourth steam inlet and a fourth steam outlet, at least one of the third steam outlet and the flash steam outlet is connected to the fourth steam inlet, and the fourth steam outlet is connected to the second steam inlet.

[0017] In some embodiments, the waste heat material joint recovery system of the metallurgical slag water quenching process further includes a condenser, which has a steam-water mixture inlet, a cooling water inlet, a condensed water outlet, a non-condensable gas outlet and a cooling water outlet, the steam-water mixture inlet is connected to the second heat absorption side outlet, and the condensed water outlet is used to connect to a downstream desalted water user.

[0018] In some embodiments, the waste heat material joint recovery system of the metallurgical slag water quenching process further includes a second vacuum pump having a gas inlet and a gas outlet, and the gas inlet is connected to the non-condensable gas outlet.

[0019] In some embodiments, the number of at least one of the heat exchanger, the flash tank, the steam booster and the multiple-effect evaporator is three, two in operation and one in standby; or the number of at least one of the heat exchanger, the flash tank, the steam booster and the multiple-effect evaporator is two, one in operation and one in standby.

[0020] The application method of the waste heat material combined recovery system of the metallurgical slag water quenching process of the utility model embodiment includes:

[0021] 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 to form low-temperature steam, and the low-temperature steam is discharged through the first heat absorption side outlet; and / or, supplying slag flushing water to the flash evaporation water inlet of the flash tank, the temperature of the slag flushing water is reduced after flash evaporation in the flash tank, and low-temperature medium water and low-temperature steam are obtained, and the low-temperature steam is discharged through the flash steam outlet; at least one of the low-temperature steam discharged from the first heat absorption side outlet and the low-temperature steam discharged from the flash steam outlet enters the multiple-effect evaporator, and at least one of the low-temperature steam discharged from the first heat absorption side outlet and the low-temperature steam discharged from the flash steam outlet enters the booster;

[0022] The steam booster pressurizes the low-temperature steam from the heat exchanger and / or the low-temperature steam from the flash tank and delivers them to downstream steam users;

[0023] Supplying produced water to the second heat absorption side inlet of the regenerator, the condenser recovering 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;

[0024] The multiple-effect evaporator utilizes the low-temperature steam from the heat exchanger and / or the low-temperature steam from the flash tank in combination with production water to prepare desalted water and simultaneously generates exhaust steam. A portion of the desalted water is supplied to downstream users via a first desalted water outlet, and a portion of the desalted water enters a first heat absorption side inlet of the heat exchanger.

[0025] The application method of the waste heat material combined recovery system of the metallurgical slag water quenching process in the embodiment of the utility model recovers slag flushing water and slag flushing steam from both material and thermal energy aspects, which not only improves the recovery rate of waste heat from the water quenching process, but also reduces the problems of large steam emissions and large new water consumption in the water quenching process. The system process is short, flexible, and less restricted by seasons and regions. The prepared steam or desalted water has a wide range of uses, which can reduce the production costs of enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of a waste heat material combined recovery system for a metallurgical slag water quenching process according to an embodiment of the utility model.

[0027] Reference numerals:

[0028] Recovery system 100;

[0029] 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;

[0030] Flash tank 2, flash water inlet 21, flash water outlet 22, flash steam outlet 23;

[0031] Steam booster 3, first steam inlet 31, first steam outlet 32;

[0032] Multiple-effect evaporator 4, second 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;

[0033] Regenerator 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;

[0034] Foam catcher 6, first slag flushing steam inlet 61, first slag flushing steam outlet 62;

[0035] Steam washing tower 7, second slag washing steam inlet 71, second slag washing steam outlet 72, washing liquid inlet 73, washing liquid outlet 74;

[0036] A first vacuum pump 8, a third steam inlet 81, and a third steam outlet 82;

[0037] Heater 9, fourth steam inlet 91, fourth steam outlet 93;

[0038] Condenser 10, steam-water mixture inlet 101, condensed water outlet 103, non-condensable gas outlet 102;

[0039] A second vacuum pump 20;

[0040] Slag flushing pool 200. DETAILED DESCRIPTION

[0041] 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.

[0042] The waste heat and material joint recovery system 100 of the metallurgical slag water quenching process of the embodiment of the utility model is to recover the waste heat and materials of the slag flushing water and slag flushing steam generated by the water quenching process, and the water quenching process is carried out in the slag flushing pool 200. During the water quenching process of the slag flushing pool 200, 70-90°C slag flushing water and 80-110°C slag flushing steam are generated. The slag flushing water is first precipitated and preliminarily filtered in the slag flushing pool 200 to remove large particulate impurities. The slag flushing pool has a third slag flushing steam outlet and a slag flushing water outlet. The slag flushing water is discharged from the slag flushing water outlet of the slag flushing pool to form a slag flushing water source, and the slag flushing steam is discharged from the third slag flushing steam outlet of the slag flushing pool to form a slag flushing steam source.

[0043] like Figure 1As shown, the waste heat material combined recovery system of the metallurgical slag water quenching process according to the embodiment of the utility model comprises a heat exchanger 1, a flash tank 2, a steam booster 3, a multi-effect evaporator 4 and a regenerator 5.

[0044] 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.

[0045] 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.

[0046] The steam booster 3 has a first steam inlet 31 and a first steam outlet 32 ​​. At least one of the first heat absorption side outlet 12 and the flash steam outlet 23 is in communication with the first steam inlet 31 . The first steam outlet 32 ​​is used to communicate with a downstream steam user.

[0047] The multiple-effect evaporator 4 has a second 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. At least one of the first heat absorption side outlet 12 and the flash steam outlet 23 is connected to the second steam inlet 41. The first desalted water outlet 45 is used to connect to a downstream desalted water user. The second desalted water outlet 46 is connected to the first heat absorption side inlet 11.

[0048] The regenerator 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.

[0049] The application method of the waste heat material combined recovery system of the metallurgical slag water quenching process of the utility model embodiment includes:

[0050] Supply slag flushing steam to the first heat release side inlet 13 of the heat exchanger 1, and the heat exchanger 1 recovers the heat energy of the slag flushing steam to initially heat the desalted water flowing through the heat exchanger 1 to form low-temperature steam, and the low-temperature steam is discharged through the first heat absorption side outlet 12; and / or, supply slag flushing water to the flash evaporation water inlet 21 of the flash tank 2, and the temperature of the slag flushing water is reduced after flash evaporation in the flash tank 2, and low-temperature medium water and low-temperature steam are obtained, and the low-temperature steam is discharged through the flash steam outlet 23; at least one of the low-temperature steam discharged from the first heat absorption side outlet 12 and the low-temperature steam discharged from the flash steam outlet 23 enters the multiple-effect evaporator 4, and at least one of the low-temperature steam discharged from the first heat absorption side outlet 12 and the low-temperature steam discharged from the flash steam outlet 23 enters the booster 3;

[0051] The steam booster 3 pressurizes the low-temperature steam from the heat exchanger 1 and / or the low-temperature steam from the flash tank 2 and transmits it to the downstream steam user;

[0052] The produced water is supplied to the second heat absorption side inlet 51 of the regenerator 5, and the condenser 10 recovers the heat energy of the exhaust steam discharged from the exhaust steam outlet 44 to heat the produced water flowing through the condenser 10, and the heated produced water flows to the water supply port 42 of the multiple-effect evaporator 4;

[0053] The multiple-effect evaporator 4 uses the low-temperature steam from the heat exchanger 1 and / or the low-temperature steam from the flash tank 2 to prepare desalted water in combination with produced water, and simultaneously generates concentrated water and exhaust steam. A portion of the desalted water is supplied to downstream users through the first desalted water outlet 45, and a portion of the desalted water enters the first heat absorption side inlet 11 of the heat exchanger 1. The multiple-effect evaporator 4 uses the thermal energy of the steam to evaporate and concentrate the produced water, and uses the condensed water formed after the steam is condensed step by step to prepare desalted water, and simultaneously generates concentrated water and exhaust steam.

[0054] In the waste heat material recovery system of the metallurgical slag water quenching process of the embodiment of the utility model, a part of the desalted water prepared by the multiple-effect evaporator 4 enters the heat exchanger 1, that is, enters the recovery system 100 to participate in heat exchange, circulation and preparation of desalted water. The desalted water contains almost no minerals and ions, which can not only reduce the corrosion and scaling problems of the equipment and pipelines passed through, but also reduce the cost of the recovery system 100 for access to the circulating liquid, and is also conducive to the steam booster 3 to prepare clean steam products. The heat exchanger 1 recovers the heat energy of the slag flushing steam and heats the desalted water entering the recovery system 100 to produce low-temperature steam. After the low-temperature steam enters the steam booster 3, the steam booster 3 pressurizes it to produce steam products, which not only realizes the recovery of the heat energy of the slag flushing steam, but also reduces the processing cost of the steam product. After the low-temperature steam discharged from the heat exchanger 1 enters the multiple-effect evaporator 4, its heat energy participates in the evaporation and concentration of the produced water, and the condensed water formed after the heat energy is consumed participates in the preparation of desalted water, so that the purpose of the recovery system 100 using the heat energy of the recovered slag flushing steam to prepare desalted water is achieved, and the manufacturing cost of the desalted water is reduced. The waste heat material joint recovery system prepares desalted water from produced water through a multiple-effect evaporator 4, wherein the exhaust steam generated in the preparation of desalted water flows through a regenerator 5, and the regenerator 5 exchanges heat between the exhaust steam and the produced water, which not only recovers the waste heat of the exhaust steam, but also preliminarily increases the temperature of the produced water, further reducing the energy consumption of the multiple-effect evaporator 4 in preparing desalted water.

[0055] In the waste heat and material joint recovery system of the metallurgical slag water quenching process of the embodiment of the utility model, the flash tank 2 flashes the slag washing water to form low-temperature steam. After the low-temperature steam enters the multiple-effect evaporator 4, its heat energy participates in evaporation and concentration of production water, and the condensed water formed after its heat energy consumption participates in the preparation of desalted water, realizing the recovery of heat energy and material of the low-temperature steam, realizing the recovery of the waste heat level and material level of a part of the slag washing water by the recovery system 100, further reducing the energy consumption of the multiple-effect evaporator 4 in preparing desalted water, and reducing the manufacturing cost of desalted water. After the low-temperature steam formed by the flash evaporation of the slag washing water directly enters the steam booster 3, the steam booster 3 pressurizes it on the basis of the low-temperature steam to form a steam product for use by downstream steam users, thereby realizing the recovery of heat energy and material of the low-temperature steam, realizing the recovery of the waste heat level and material level of a part of the slag washing water by the recovery system 100 of the embodiment of the utility model. Alternatively, part of the low-temperature steam formed by the flash evaporation of the slag washing water enters the multiple-effect evaporator 4, and the other part enters the steam booster 3.

[0056] The waste heat material joint recovery system 100 of the metallurgical slag water quenching process of the utility model embodiment not only recovers the thermal energy of the slag flushing steam and slag flushing water, improves the waste heat recovery rate of the water quenching technology, and reduces the problem of large steam emissions in the water quenching process, but also recovers part of the slag flushing water at the material level, realizing the waste heat and material recovery of the slag flushing steam and slag flushing water. In addition, steam products and desalted water have a wide range of uses and a large demand. The waste heat material joint recovery system 100 of the metallurgical slag water quenching process of the utility model embodiment can prepare steam products and desalted water, which not only improves the practicality of the recovery system 100, but also improves the flexibility of the waste heat recovery of the water quenching process, so that the operation of the recovery system 100 is not restricted by seasons and regions, and can be used all year round.

[0057] Therefore, the waste heat and material combined recovery system 100 of the metallurgical slag water quenching process in the embodiment of the utility model realizes the recovery of waste heat and materials of the slag flushing steam and slag flushing water generated in the water quenching process, improves the waste heat recovery efficiency, reduces steam emissions, has low operating costs, has good applicability for waste heat and material recovery, and reduces the energy consumption in the preparation of desalted water and steam products, reduces the cost of preparing desalted water and steam products, and improves the flexibility of waste heat recovery of water quenching technology.

[0058] In order to make the solution of the present application easier to understand, the temperature of the slag flushing steam in the waste heat material joint recovery system 100 of the metallurgical slag water quenching process of the present utility model embodiment is 95°C and the temperature of the slag flushing water is 80°C. Figure 1 , the waste heat material combined recovery system 100 and application method of the metallurgical slag water quenching process according to the embodiment of the utility model are described in detail.

[0059] The waste heat material combined recovery system 100 of the metallurgical slag water quenching process according to the embodiment of the utility model comprises a heat exchanger 1, a flash tank 2, a steam booster 3, a multi-effect evaporator 4, a regenerator 5, a foam collector 6, a steam washing tower 7, a first vacuum pump 8, a heater 9, a condenser 10 and a second vacuum pump 20.

[0060] The foam catcher 6 has a first slag flushing steam inlet 61 and a first slag flushing steam outlet 62. The first slag flushing steam inlet 61 is connected to the third slag flushing steam outlet, and the first slag flushing steam outlet 62 is connected to the first heat release side inlet 13. The slag flushing steam discharged from the third slag flushing steam outlet of the slag flushing pool enters the foam catcher 6, and the foam catcher 6 filters the slag flushing steam to remove dust and large droplets therein, ensuring that only steam is discharged from the first slag flushing steam outlet 62 of the foam catcher 6, and the discharged slag flushing steam enters the steam washing tower 7. The foam catcher 6 purifies the slag flushing steam, which can avoid corrosion and scaling of subsequent equipment through which the slag flushing steam passes.

[0061] The mixture of dust and liquid droplets collected by the mist catcher 6 is treated as sewage.

[0062] Specifically, the foam catcher 6 is provided with a heat-insulating cover (not shown in the figure), so as to reduce the heat energy loss of the slag-flushing steam and reduce the energy dissipation of the slag-flushing steam in the intermediate links.

[0063] The steam washing tower 7 has a second slag flushing steam inlet 71 and a second slag flushing steam outlet 72. The second slag flushing steam inlet 71 is connected to the first slag flushing steam outlet 62, and the second slag flushing steam outlet 72 is connected to the first heat release side inlet 13. The slag flushing steam enters the steam washing tower 7 through the second slag flushing steam inlet 71, and the steam washing tower 7 washes and purifies the slag flushing steam, and then the slag flushing steam is discharged from the second slag flushing steam outlet 72 into the heat exchanger 1. The further purification of the slag flushing steam by the steam washing tower 7 can further avoid corrosion and scaling of subsequent equipment through which the slag flushing steam passes.

[0064] Specifically, the steam washing tower 7 has a washing liquid inlet 73 and a washing liquid outlet 74, and the washing liquid is circulated and replaced regularly. The waste heat material joint recovery system further includes a preheater (not shown in the figure), which has a heating inlet and a heating outlet, the heating inlet is connected to the washing liquid outlet 74, and the heating outlet is connected to the washing liquid inlet 73. The heater heats the washing liquid to maintain the washing liquid temperature at about 95°C, so that when the washing liquid purifies the slag steam, the temperature of the slag steam is further avoided from being lowered, and the energy dissipation of the slag steam in the intermediate link is further reduced.

[0065] The heat exchanger 1 has a first heat absorption side inlet 11, a first heat absorption side outlet 12, a first heat release side inlet 13 and a first heat release side outlet 14. The first heat release side inlet 13 is used to connect the slag flushing steam source. The first heat absorption side inlet 11 is connected to the second desalted water outlet 46 of the multiple-effect evaporator 4. After the slag flushing steam is discharged from the second slag flushing steam outlet 72, it enters the heat exchanger 1 through the first heat release side inlet 13 and is discharged from the first heat release side outlet 14. Desalted water enters the heat exchanger 1 from the first heat absorption side inlet 11 and is discharged from the first heat absorption side outlet 12. The heat exchanger 1 uses the heat energy of the slag flushing steam to heat the desalted water to prepare low-temperature steam of 80-90°C, and the low-temperature steam is discharged through the first heat absorption side outlet 12.

[0066] The first vacuum pump 8 has a third steam inlet 81 and a third steam outlet 82, the third steam inlet 81 is connected to the first heat absorption side outlet 12, at least one of the third steam outlet 82 and the flash steam outlet 23 is connected to the first steam inlet 31, and at least one of the third steam outlet 82 and the flash steam outlet 23 is connected to the fourth steam inlet 91. The first vacuum pump 8 evacuates the heat exchanger 1 and maintains a certain negative pressure state to accelerate the low-temperature evaporation rate of the desalted water in the heat exchanger 1.

[0067] Specifically, the fourth steam inlet 91 and the first steam inlet 31 are connected in parallel and communicated with the third steam outlet 82 of the first vacuum pump 8. A first valve is provided on the connecting pipeline between the fourth steam inlet 91 and the third steam outlet 82. A second valve is provided on the connecting pipeline between the first steam inlet 31 and the third steam outlet 82. The first valve and the second valve control and adjust their openings respectively. When the first valve is opened, the low-temperature steam discharged from the first vacuum pump 8 enters the heater 9. When the second valve is opened, the low-temperature steam discharged from the first vacuum pump 8 enters the steam booster 3.

[0068] 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 connected to the slag flushing water outlet of the slag flushing pool 200. At least one of the third steam outlet 82 and the flash steam outlet 23 is connected to the first steam inlet 31. At least one of the third steam outlet 82 and the flash steam outlet 23 is connected to the fourth steam inlet 91. The slag flushing water is flashed in the flash tank 2 to produce low-temperature intermediate water and low-temperature steam of 50-75°C. The low-temperature intermediate water is discharged from the flash water outlet 22, and the low-temperature intermediate water is recycled to the water quenching process system for recycling, thereby reducing the new water consumption of the water quenching process.

[0069] Specifically, a third valve is provided on the connecting pipeline between the flash steam outlet 23 and the first steam inlet 31, and a fourth valve is provided on the connecting pipeline between the flash steam outlet 23 and the fourth steam inlet 91. The third valve and the fourth valve control and adjust their openings respectively. When the third valve is opened, the low-temperature steam discharged from the flash tank 2 enters the steam booster 3. When the fourth valve is opened, the low-temperature steam discharged from the flash tank 2 enters the heater 9.

[0070] The steam booster 3 has a first steam inlet 31 and a first steam outlet 32. At least one of the third steam outlet 82 and the flash steam outlet 23 is connected to the first steam inlet 31. The first steam outlet 32 ​​is used to connect to downstream steam users. The low-temperature steam from the vacuum pump 8 and / or the low-temperature steam from the flash tank 2 enters the steam booster 3. The steam booster 3 pressurizes the low-pressure steam to obtain the pressure required by the user, makes a steam product and delivers it to the downstream steam user. When the third steam outlet 82 and the flash steam outlet 23 are both connected to the first steam inlet 31, the low-temperature steam from the vacuum pump 8 and the low-temperature steam from the flash tank 2 are mixed and enter the steam booster 3.

[0071] The type of compressor used by the steam booster 3 is selected according to the site conditions and the steam pressure requirement. The compressor can be a Roots compressor or a centrifugal compressor, and a single-stage compressor or a multi-stage compressor can be installed. In this embodiment, the steam booster 3 uses a centrifugal compressor type single-stage compressor.

[0072] The heater 9 has a fourth steam inlet 91 and a fourth steam outlet 93. The fourth steam inlet 91 is connected to the third steam outlet 82. At least one of the third steam outlet 82 and the flash steam outlet 23 is connected to the fourth steam inlet 91. The low-temperature steam from the vacuum pump 8 and / or the low-temperature steam from the flash tank 2 enters the heater 9. The heater 9 heats the steam to obtain medium-temperature steam of 0.1 MPa and a temperature not lower than 85°C. The medium-temperature steam is discharged from the fourth steam outlet 93 and enters the multiple-effect evaporator 4 to improve the efficiency of the multiple-effect evaporator 4 in evaporating and concentrating the produced water and preparing desalted water. When the third steam outlet 82 and the flash steam outlet 23 are both connected to the fourth steam inlet 91, the low-temperature steam from the vacuum pump 8 and the low-temperature steam from the flash tank 2 are mixed and enter the heater 9.

[0073] Specifically, the heating method of the heater 9 is electric heating, fuel combustion heating, or factory flue gas waste heat heating. In this embodiment, the heating method is flue gas waste heat heating.

[0074] The multiple-effect evaporator 4 has a second 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 fourth steam outlet 93 is connected to the second steam inlet 41. The first desalted water outlet 45 is used to connect to the downstream desalted water user. The second desalted water outlet 46 is connected to the first heat absorption side inlet 11. The steam heated by the heater 9 enters the multiple-effect evaporator 4 through the second steam inlet 41, and the produced water enters the multiple-effect evaporator 4 through the water supply port 42.

[0075] The multi-effect evaporator 4 uses the heat energy of the medium-temperature steam entering the second steam inlet 41 to evaporate and concentrate the produced water to prepare desalted water at 40°C, and at the same time generate concentrated water and exhaust steam at 40°C. A part of the desalted water is supplied to the downstream desalted water users through the first desalted water outlet 45, and a part of the desalted water enters the heat exchanger 1 through the second desalted water outlet 46. The concentrated water is discharged through the recovery port 43, and the concentrated water is recovered and discharged to the sewage treatment workshop for treatment. The exhaust steam is discharged through the exhaust steam outlet 44, and the exhaust steam enters the regenerator 5 for waste heat recovery.

[0076] Further, the multi-effect evaporator 4 adopts a scale larger than that of a triple-effect evaporator. For example, the multi-effect evaporator 4 adopts a five-effect evaporator, or the multi-effect evaporator 4 adopts a seven-effect evaporator.

[0077] 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.

[0078] The regenerator 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. The exhaust steam and the production water exchange heat in the regenerator 5, thereby raising the temperature of the production water, preheating the production water, and cooling the exhaust steam to form a steam-water mixture. The preheated production water enters the multi-effect evaporator 4 through the second heat absorption side outlet 52 and the water supply port 42, and the steam-water mixture is discharged through the second heat release side outlet 54.

[0079] The regenerator 5 utilizes the exhaust steam discharged from the multiple-effect evaporator 4 to initially heat the produced water, which not only recovers the waste heat of the exhaust steam, but also increases the temperature of the produced 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 reduces the amount of steam discharged to the outside in the form of exhaust steam from the recovery system 100, that is, reduces the amount of steam discharged to the outside by the recovery system 100.

[0080] The condenser 10 has a steam-water mixture inlet 101, a cooling water inlet (not shown in the figure), a condensed water outlet 103, a non-condensable gas outlet 102 and a cooling water outlet (not shown in the figure). The steam-water mixture inlet 101 is connected to the second heat absorption side outlet 52, and the condensed water outlet 103 is used to connect to the downstream desalted water user. The steam-water mixture enters the condenser 10 through the steam-water mixture inlet 101, and the cooling water enters the condenser through the cooling water inlet. The cooling water and the steam-water mixture perform heat exchange to cool the steam-water mixture into condensed water and generate non-condensable gas. The condensed water is discharged through the condensed water outlet 103, and the condensed water and the desalted water are supplied to the downstream desalted water user for use. The cooling water is discharged through the cooling water outlet 105, and the non-condensable gas is discharged through the non-condensable gas outlet 102.

[0081] Specifically, the condensate outlet 103 and the first desalted water outlet 45 are connected to the same three-way joint, and the condensate and the desalted water are mixed and provided to downstream desalted water users.

[0082] Specifically, the condenser 10 may be a tube-type or plate-type partition-wall heat exchanger. In this embodiment, the regenerator 10 is a plate-type partition-wall heat exchanger.

[0083] The second vacuum pump 20 has a gas inlet and a gas outlet, and the gas inlet is connected to the non-condensable gas outlet 102. The second vacuum pump 20 provides negative pressure power for the flow of the steam-water mixture and non-condensable gas in the condenser 10, assists in removing the non-condensable gas in the condensed water, and prevents the condensed water discharged from the condensed water outlet 103 from carrying the non-condensable gas into the downstream desalted water users.

[0084] In some embodiments, the number of at least one of the heat exchanger 1, the flash tank 2, the steam booster 3 and the multiple-effect evaporator 4 is three, two in operation and one in standby. The layout of two in operation and one in standby 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 steam booster 3 and the multiple-effect evaporator 4. Or the number of at least one of the heat exchanger 1, the flash tank 2, the steam booster 3 and the multiple-effect evaporator 4 is two, one in operation and one in standby to operate in turns.

[0085] In some embodiments, the heat exchanger 1 and the regenerator 5 use tubular or plate-type partition-wall heat exchangers, add corrosion-resistant and anti-scaling coatings, or use corrosion-resistant and anti-scaling materials.

[0086] Preferably, the heat exchanger 1 is a plate-type partition-type heat exchanger, and the regenerator is a tube-type partition-type heat exchanger.

[0087] The waste heat and material joint recovery system 100 of the metallurgical slag water quenching process of the embodiment of the utility model recovers waste heat and materials from the slag flushing water and slag flushing steam, and at the same time, it can also recover the slag flushing water or the slag flushing steam separately. When the slag flushing water is recovered separately, the first vacuum pump 8 is closed, the first valve on the connecting pipeline between the fourth steam inlet 91 and the third steam outlet 82 is closed, the second desalted water outlet 46 is closed, and the flash tank 2, the steam booster 3 and the multi-effect evaporator 4 recover the heat energy and materials of the slag flushing water, and prepare the desalted water and steam products at the same time. When the slag flushing steam is recovered separately, the flash tank 2 is closed, the third valve on the connecting pipeline between the flash steam outlet 23 and the first steam inlet 31, and the fourth valve on the connecting pipeline between the flash steam outlet 23 and the fourth steam inlet 91 are closed, and the heat exchanger 1, the steam booster 3 and the multi-effect evaporator 4 recover the heat energy of the slag flushing steam, and prepare the desalted water and steam products at the same time. It should be noted that when recovering slag flushing steam separately, the recycling liquid needs to be introduced in the early stage of operation when the recovery system 100 is started. Therefore, the waste heat material joint recovery system 100 of the metallurgical slag water quenching process of the utility model embodiment can be selected to be activated as a whole, deactivated as a whole, or activated selectively, so that the recovery system 100 has flexible recovery operation, has no impact on the main process of metallurgical production, has strong adaptability, and is also easy to transform and establish on the existing water quenching process waste heat recovery equipment, solving the problem of narrow applicability of waste heat recovery systems in related technologies.

[0088] The waste heat material combined recovery system 100 of the metallurgical slag water quenching process in the embodiment of the utility model recovers slag flushing water and slag flushing steam from both material and thermal energy aspects, which not only improves the recovery rate of waste heat from the water quenching process, but also reduces the problems of large steam emissions and large new water consumption in the water quenching process. The system process is short, flexible, and less restricted by seasons and regions. The prepared steam or desalted water has a wide range of uses, which can reduce the production costs of enterprises.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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 waste heat material combined recovery system for metallurgical slag water quenching process, 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 steam booster (3), the steam booster (3) having a first steam inlet (31) and a first steam outlet (32), at least one of the first heat absorption side outlet (12) and the flash steam outlet (23) being in communication with the first steam inlet (31), and the first steam outlet (32) being used to be in communication with a downstream steam user; A multiple-effect evaporator (4), the multiple-effect evaporator (4) having a second 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), at least one of the first heat absorbing side outlet (12) and the flash steam outlet (23) being in communication with the second steam inlet (41), the first desalted water outlet (45) being used to communicate with a downstream desalted water user, and the second desalted water outlet (46) being in communication with the first heat absorbing side inlet (11); and A regenerator (5), the regenerator (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 production water source, the second heat absorbing side outlet (52) being connected to the water supply port (42), and the second heat releasing side inlet (53) being connected to the exhaust steam outlet (44).

2. The waste heat material combined recovery system of the metallurgical slag water quenching process according to claim 1 is characterized in that: The invention further comprises a foam catcher (6), wherein the foam catcher (6) has a first slag flushing steam inlet (61) and a first slag flushing steam outlet (62), wherein the first slag flushing steam inlet (61) is used to connect to a slag flushing steam source, and the first slag flushing steam outlet (62) is connected to the first heat release side inlet (13).

3. The waste heat material combined recovery system of the metallurgical slag water quenching process according to claim 2 is characterized in that: The invention further comprises a steam washing tower (7), wherein the steam washing tower (7) has a second slag flushing steam inlet (71) and a second slag flushing steam outlet (72), wherein the second slag flushing steam inlet (71) is connected to the first slag flushing steam outlet (62), and the second slag flushing steam outlet (72) is connected to the first heat release side inlet (13).

4. The waste heat material combined recovery system of the metallurgical slag water quenching process according to claim 3 is characterized in that: The steam washing tower (7) has a washing liquid inlet (73) and a washing liquid outlet (74), and the waste heat material joint recovery system further includes a preheater, the preheater has a heating inlet and a heating outlet, the heating inlet is connected to the washing liquid outlet (74), and the heating outlet is connected to the washing liquid inlet (73).

5. The waste heat material combined recovery system of the metallurgical slag water quenching process according to claim 1 is characterized in that: The invention further comprises a first vacuum pump (8), wherein the first vacuum pump (8) has a third steam inlet (81) and a third steam outlet (82), wherein the third steam inlet (81) is connected to the first heat absorption side outlet (12), and at least one of the third steam outlet (82) and the flash steam outlet (23) is connected to the first steam inlet (31), and at least one of the third steam outlet (82) and the flash steam outlet (23) is connected to the second steam inlet (41).

6. The waste heat material combined recovery system of the metallurgical slag water quenching process according to claim 5 is characterized in that: The invention further comprises a heater (9), wherein the heater (9) has a fourth steam inlet (91) and a fourth steam outlet (93), at least one of the third steam outlet (82) and the flash steam outlet (23) is connected to the fourth steam inlet (91), and the fourth steam outlet (93) is connected to the second steam inlet (41).

7. The waste heat material combined recovery system of the metallurgical slag water quenching process according to claim 1 is characterized in that: It further comprises a condenser (10), the condenser (10) having a steam-water mixture inlet (101), a cooling water inlet, a condensed water outlet (103), a non-condensable gas outlet (102) and a cooling water outlet, the steam-water mixture inlet (101) being connected to the second heat absorption side outlet (52), and the condensed water outlet (103) being used to connect to a downstream desalted water user.

8. The waste heat material combined recovery system of the metallurgical slag water quenching process according to claim 7 is characterized in that: It further comprises a second vacuum pump (20), wherein the second vacuum pump (20) has a gas inlet and a gas outlet, wherein the gas inlet is in communication with the non-condensable gas outlet (102).

9. The waste heat material combined recovery system of the metallurgical slag water quenching process according to claim 1 is characterized in that: The number of at least one of the heat exchanger (1), the flash tank (2), the steam booster (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 steam booster (3) and the multiple-effect evaporator (4) is two, one of which is in operation and one is in standby.

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