Device for assisting cooling wall circulating water refrigeration through waste heat of slag flushing water of blast furnace

Abstract

The invention relates to a device for assisting cooling wall circulating water refrigeration through blast furnace slag flushing water waste heat. Lithium bromide is adopted for achieving waste heat recovery and circulating water cooling. Comprising a slag water scale preventer, a high-temperature generator, a low-temperature flash evaporator, a steam ejector, a condenser, an absorber, a heat exchanger and a water flow reversing valve group. Lithium bromide solution of the high-temperature generator flows through the high-temperature heat exchanger to release heat and is jetted to the absorber; high-temperature slag flushing water passes through the slag water scale preventer and then flows through the high-temperature generator to be sprayed to the low-temperature flash evaporator; steam in the low-temperature generator enters the condenser through a guide plate, and residual lithium bromide in the low-temperature generator flows through the low-temperature heat exchanger and then is jetted to the absorber; water pumped out of the slag flushing water cooling pool passes through the water flow reversing valve set and the condenser, then flows through the absorber and returns to the cooling pool. Circulating water of the blast furnace cooling wall flows through the water flow reversing valve set and then flows through the evaporator to achieve refrigeration and cooling. The device solves waste of waste heat of slag flushing water, realizes cooling of circulating water on the cooling wall of the blast furnace, and has good working benefits.

Description

Technical Field

[0001] The present invention relates to a device for cooling the circulating water of a cooling stave by utilizing the waste heat of blast furnace slag water, belonging to the technical field of metallurgical waste heat refrigeration. Background Art

[0002] Blast furnace slag water is a by-product of the water quenching process of blast furnace slag. The high-temperature slag at 1400°C - 1500°C in the blast furnace is impacted and broken into qualified granulated slag in the slag flushing chute. In this process, the temperature of the slag water can reach 70 - 85°C, featuring a low heat source temperature and a large flow rate. Rational utilization of its waste heat can not only save resources but also protect the environment. Currently, the main application of waste heat utilization is for winter heating, but the utilization efficiency of heating is restricted by seasonality and regionality. For example, in summer in northern China and in southern regions where heating is not required, waste heat is easily wasted; at the same time, the slag water contains a large amount of impurities and has a certain corrosiveness, which is likely to cause blockage and erosion of pipelines; in addition, waste heat of slag water can be used for binary cycle power generation, but the system operating temperature is above 100°C, and the slag water belongs to a relatively low-temperature waste heat source, resulting in low power generation efficiency.

[0003] Considering making full use of the waste heat of blast furnace slag water locally, high-temperature blast furnace slag water with impurities removed can be used for refrigeration design. The blast furnace is a high-temperature reactor, and the circulating water of the cooling stave around the furnace chamber can effectively cool the furnace chamber and maintain the long-term stable operation of the blast furnace. Therefore, in combination with the utilization of waste heat of slag water and the need for a low-temperature environment of the cooling stave circulating water, the present invention creatively proposes a device for cooling the circulating water of a cooling stave by utilizing the waste heat of blast furnace slag water. While making full use of the waste heat of blast furnace slag water and maintaining a low-temperature environment in the evaporator, it can fully achieve the purpose of cooling the cooling stave circulating water flowing through the evaporator and ultimately maintain the stable working temperature of the blast furnace. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] In order to solve the phenomenon of waste of waste heat of blast furnace slag water, the present invention provides a device for cooling the circulating water of a cooling stave by utilizing the waste heat of blast furnace slag water, using lithium bromide-water as the refrigerant pair. While fully utilizing the waste heat of blast furnace slag water throughout the year, it can also achieve the effect of cooling the circulating water of the blast furnace cooling stave. In addition, the cooling water used in the refrigeration cycle can be directly taken from the cold water pool of the slag water, avoiding additional supplementary cooling water. The standby high-temperature generator is heated by a solar water heater, saving electric energy; and the standby high-temperature generator can effectively solve the defect that the cooling effect cannot be normally maintained due to unstable supply of high-temperature blast furnace slag water.

[0006] (2) Technical Solutions

[0007] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0008] A device for cooling the circulating water of a blast furnace cooling stave with the waste heat of slag granulation water, which realizes the effect of cooling the circulating water of the cooling stave by utilizing the waste heat of the slag granulation water. It includes a slag water anti-scaling device, a high-temperature generator, a standby high-temperature generator, a low-temperature flash evaporator, a steam ejector, a low-temperature generator, a condenser, an absorber, an evaporator, a high-temperature heat exchanger, a low-temperature heat exchanger, a water flow reversing valve group, a throttle valve, a slag granulation water cooling water tank, a blast furnace cooling stave, and a circulating pump. The refrigerant pair used is lithium bromide-water. Among them, the high-temperature slag granulation water flows through the slag water anti-scaling device, the high-temperature generator, and the low-temperature flash evaporator in sequence, and the remaining cold water directly leads to the slag granulation water cooling water tank. The steam outlets of the high-temperature generator and the low-temperature flash evaporator are connected to the steam ejector and are connected to the low-temperature generator through pipelines. The lithium bromide concentrated solution in the high-temperature generator and the low-temperature generator is finally sprayed into the absorber. After the lithium bromide solution in the absorber is diluted by the steam from the evaporator, it is pumped to the high-temperature generator and the low-temperature generator again. The condenser is connected to the evaporator through a throttle valve. The condenser is connected to the water flow reversing valve group. The circulating cooling water is taken from the slag granulation water cooling water tank. The circulating water pipeline of the blast furnace cooling stave flows through the water flow reversing valve group and is connected to the evaporator.

[0009] For the device for cooling the circulating water of a blast furnace cooling stave with the waste heat of slag granulation water as described above, preferably, when the high-temperature slag granulation water flows through the slag water anti-scaling device, the impurities in the water flow out from the slag outlet, and then the residual smaller solid impurities are removed through a slag removal net. Then the water flows to the electrodialysis box to remove the excess ions in the liquid, preventing the corrosion of the pipeline or the formation of scale.

[0010] For the device for cooling the circulating water of a blast furnace cooling stave with the waste heat of slag granulation water as described above, preferably, after the high-temperature slag granulation water releases heat through the heat exchange coil of the high-temperature generator, it enters the low-temperature flash evaporator in a spraying manner. The low-temperature flash evaporator is provided with a primary flash evaporation chamber and a secondary flash evaporation chamber. The slag granulation water that is not completely vaporized is directly discharged into the slag granulation water cooling water tank.

[0011] For the device for cooling the circulating water of a blast furnace cooling stave with the waste heat of slag granulation water as described above, preferably, the standby high-temperature generator is a reactor that uses the hot water generated by a solar water heater to heat the lithium bromide solution, which is a standby device for the high-temperature generator, and is equipped with an intelligent control module to achieve precise temperature control. The standby high-temperature generator can effectively solve the problem of unstable supply of high-temperature slag granulation water.

[0012] For the device for cooling the circulating water of a blast furnace cooling stave with the waste heat of slag granulation water as described above, preferably, the steam ejector uses the water vapor in the high-temperature generator as the driving steam to eject the water vapor of the low-temperature flash evaporator, and the two are mixed and boosted to enter the low-temperature generator.

[0013] The device for cooling the circulating water of the cooling stave with the waste heat of the blast furnace slag flushing water as described above. Preferably, the low-temperature generator and the condenser are arranged as an integral device, and steam enters the condenser from the low-temperature generator through the internal grid; the absorber and the evaporator are arranged as an integral device, and steam enters the absorber from the evaporator through the internal grid; the lithium bromide solution in the low-temperature generator flows from the outlet, releases heat through the low-temperature heat exchanger and then sprays onto the absorber, and the low-temperature water in the condenser sprays onto the evaporator coil after throttling and pressure reduction through the throttle valve from the outlet.

[0014] The device for cooling the circulating water of the cooling stave with the waste heat of the blast furnace slag flushing water as described above. Preferably, the hot steam discharged from the high-temperature generator and the flash evaporator flows through the heat exchange coil of the low-temperature generator to heat the lithium bromide solution, then becomes liquid water, and directly enters the condenser through the pipeline through the condenser inlet; the hot lithium bromide solution discharged from the high-temperature generator sprays onto the absorber through the high-temperature inlet of the absorber after releasing heat through the high-temperature heat exchanger, and a part of the dilute lithium bromide solution discharged from the absorber is pumped to the low-temperature generator through the dilute lithium bromide solution inlet of the low-temperature generator, and the remaining solution is pumped to the high-temperature generator after absorbing heat through the low-temperature and high-temperature heat exchangers in sequence.

[0015] The device for cooling the circulating water of the cooling stave with the waste heat of the blast furnace slag flushing water as described above. Preferably, the condenser and the evaporator are respectively provided with water flow reversing valve groups for periodically switching the direction of the water flow entering the condenser and the evaporator to avoid scale deposition on the condenser and the evaporator.

[0016] The device for cooling the circulating water of the cooling stave with the waste heat of the blast furnace slag flushing water as described above. Preferably, the circulating cooling water of the condenser and the absorber is directly taken from the cold water pool of the slag flushing water for cooling, and the circulating water of the blast furnace cooling stave is transported back to the blast furnace cooling stave pipeline after cooling by flowing through the evaporator coil.

[0017] (III) Beneficial effects

[0018] The beneficial effects of the present invention are:

[0019] The device for auxiliary cooling of the cooling stave circulating water by using the waste heat of blast furnace slag water provided by the present invention can effectively solve the phenomenon of waste heat of slag water and finally achieve the effect of cooling the cooling stave circulating water. This device can realize the utilization of waste heat near the smelter, effectively avoiding problems such as waste heat loss and too long pipelines during the long-distance transportation of slag water, and can realize the effective utilization of waste heat throughout the year, no longer being restricted by seasonality and regionality. The solar heating type standby high-temperature generator can effectively solve the unstable supply of blast furnace slag water while making full use of clean energy, and can continuously ensure the refrigeration demand of the cooling stave circulating water. In addition, the cooling stave circulating water can obtain a lower temperature than conventional circulating water, which can better achieve the cooling of the furnace wall. The slag water used in the whole process is the slag water that removes impurities by using a slag water scale inhibitor and other processes, and by using a water flow reversing valve group, pipeline blockage can be effectively avoided. The cooling circulating water required by the condenser and absorber can be directly taken from the cold water pool of the slag water, and cooling towers are no longer needed for cooling.

[0020] The waste heat assisted refrigeration device provided by the present invention can be widely applied to the research and industrial promotion of waste heat refrigeration of high-temperature or low-temperature waste liquid and waste gas in the fields of metallurgy, energy, thermal power, etc. Brief Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the overall structure of a preferred embodiment;

[0022] Figure 2 It is a schematic diagram of the structure of the high-temperature generator;

[0023] Figure 3 It is a schematic diagram of the structure of the low-temperature flash evaporator;

[0024] Figure 4 It is a schematic diagram of the overall structure of the low-temperature generator and the condenser;

[0025] Figure 5 It is a schematic diagram of the overall structure of the absorber and the evaporator;

[0026] Figure 6 It is a schematic diagram of the overall structure of the slag water scale inhibitor;

[0027] Figure 7 It is a schematic diagram of the overall structure of the steam ejector;

[0028] Figure 8 It is a schematic diagram of the overall structure of the water flow reversing valve group.

[0029]

Description of the Reference Numerals

[0030] 10: High-temperature generator;

[0031] 11: High-temperature slag water inlet;

[0032] 12: Heat exchange coil of high-temperature generator;

[0033] 13: Outlet of high-temperature slag flushing water;

[0034] 14: Outlet of concentrated lithium bromide solution of high-temperature generator;

[0035] 15: Inlet of dilute lithium bromide solution of high-temperature generator;

[0036] 16: Outlet of steam from high-temperature generator;

[0037] 20: Spare high-temperature generator;

[0038] 21: Inlet of spare solar hot water;

[0039] 22: Heat exchange coil of spare high-temperature generator;

[0040] 23: Outlet of concentrated lithium bromide solution of spare high-temperature generator;

[0041] 24: Inlet of spare dilute lithium bromide solution;

[0042] 30: Low-temperature flash evaporator;

[0043] 31: Inlet of low-temperature flash evaporator;

[0044] 32: Primary flash evaporation chamber;

[0045] 33: Steam outlet of primary flash evaporation chamber;

[0046] 34: Secondary flash evaporation chamber;

[0047] 35: Steam outlet of secondary flash evaporation chamber;

[0048] 36: Outlet of slag flushing water from low-temperature flash evaporator;

[0049] 40: Low-temperature generator;

[0050] 41: Steam inlet of low-temperature generator;

[0051] 42: Heat exchange coil of low-temperature generator;

[0052] 43: Outlet of concentrated lithium bromide solution of low-temperature generator;

[0053] 44: Inlet of dilute lithium bromide solution of low-temperature generator;

[0054] 50: Condenser;

[0055] 51: Inlet of condenser;

[0056] 52: Outlet of condenser;

[0057] 53: Inlet of condenser coil;

[0058] 54: Condenser coil

[0059] 55: Condenser coil outlet

[0060] 60: Absorber

[0061] 61: Absorber low-temperature inlet

[0062] 62: Absorber high-temperature inlet

[0063] 63: Absorber coil inlet

[0064] 64: Absorber coil

[0065] 65: Absorber coil outlet

[0066] 66: Absorber lithium bromide weak solution outlet

[0067] 70: Evaporator

[0068] 71: Evaporator internal circulation inlet

[0069] 72: Evaporator main inlet

[0070] 73: Blast furnace cooling stave circulating water evaporator outlet

[0071] 74: Evaporator coil

[0072] 75: Blast furnace cooling stave circulating water evaporator inlet

[0073] 80: Slag water cooling pond

[0074] 90: Blast furnace cooling stave

[0075] 100: Low-temperature heat exchanger

[0076] 110: High-temperature heat exchanger

[0077] 120: Throttle valve

[0078] 130: Slag water scale inhibitor

[0079] 131: Box cover

[0080] 132: Box body

[0081] 133: Furnace slag

[0082] 134: Screw propeller

[0083] 135: Motor

[0084] 136: Slag storage tank

[0085] 137: Slag removal screen

[0086] 138: Electrodialysis box

[0087] 140: Steam ejector

[0088] 141: Steam inlet pipe

[0089] 142: Ejector nozzle

[0090] 143: Ejector suction chamber

[0091] 144: Ejector suction pipe

[0092] 145: Converging pipe of ejector diffuser

[0093] 146: Diverging pipe of ejector diffuser

[0094] 150: Water flow direction change valve group

[0095] 151: Stop valve one

[0096] 152: Stop valve two

[0097] 153: Stop valve three

[0098] 154: Stop valve four

[0099] 155: Pipe one

[0100] 156: Pipe two

[0101] 157: Ultrasonic on-line scale prevention and descaling device

[0102] 158: Drainage pipe

[0103] 159: Return pipe

[0104] P1, P2: Solution pumps

[0105] P3: Refrigeration pump

[0106] P4: Submersible pump

[0107] P5: Circulating water pump

[0108] Q1 - Q6: Automatic control ball valves Detailed implementation manners

[0109] The present invention solves the problem of waste of waste heat of blast furnace slag water, realizes the effect of using waste heat to assist the refrigeration and temperature reduction of the circulating water of the blast furnace cooling wall throughout the year, and has good working benefits. In order to better explain the present invention for easy understanding, the present invention will be described in detail below with reference to the accompanying drawings through specific implementation manners.

[0110] As Figure 1Schematic diagram of the overall structure shown. The device for cooling the circulating water of the blast furnace cooling stave with the waste heat of the blast furnace slag water mainly includes a slag water scale inhibitor (130), a high-temperature generator (10), a standby high-temperature generator (20), a low-temperature flash evaporator (30), a steam ejector (140), a low-temperature generator (40), a condenser (50), an absorber (60), an evaporator (70), a high-temperature heat exchanger (110), a low-temperature heat exchanger (100), a water flow reversing valve group (150), a throttle valve (120), a blast furnace slag water cooling pond (80), a blast furnace cooling stave (90), and a circulating pump. The refrigerant pair used is lithium bromide-water. Among them, the standby high-temperature generator (20) is effectively adjusted according to the actual supply amount of the high-temperature blast furnace slag water after removing impurities. When the supply amount is insufficient to enable the high-temperature generator (10) to be in operation, the solar water heater should be self-started to heat the standby high-temperature generator (20).

[0111] As Figure 2 Schematic diagram of the high-temperature generator structure shown. Among them, the standby lithium bromide dilute solution inlet (24) and the high-temperature generator lithium bromide dilute solution inlet (15) have the same function. The standby high-temperature generator lithium bromide concentrated solution outlet (23) and the high-temperature generator lithium bromide concentrated solution outlet (14) have the same function. The standby solar hot water inlet (21) and the high-temperature blast furnace slag water inlet (11) have the same function. The standby high-temperature generator heat exchange coil (22) and the high-temperature generator heat exchange coil (12) have the same function. According to the actual supply situation of the high-temperature blast furnace slag water, when the standby high-temperature generator (20) is enabled, the ball valve Q3 corresponds to Q2, the ball valve Q4 corresponds to Q1, and the ball valve Q6 corresponds to Q5, and automatic adjustment control should be achieved. The high-temperature steam generated in the generator enters the low-temperature generator (40) through the high-temperature generator steam outlet (16) via a pipeline through the low-temperature generator steam inlet (41); the high-temperature lithium bromide concentrated solution is sent to the high-temperature heat exchanger (110) through the outlet (14) for heat release; the slag water after one heat exchange enters the low-temperature flash evaporator (30) through the low-temperature flash evaporator inlet (31).

[0112] As Figure 3 Schematic diagram of the low-temperature flash evaporator structure shown. It is provided with a primary flash evaporation chamber (32) and a secondary flash evaporation chamber (34) inside. The slag water from the high-temperature generator first enters the primary flash evaporation chamber (32). The steam generated therein is sent to the low-temperature generator steam inlet (41) through the primary flash evaporation chamber steam outlet (33). The slag water that has not been completely vaporized enters the secondary flash evaporation chamber (34) to continue vaporization. The steam generated therein is also sent to the low-temperature generator steam inlet (41) through the secondary flash evaporation chamber steam outlet (35). The remaining unvaporized slag water is directly discharged to the blast furnace slag water cooling pond (80) through the low-temperature flash evaporator slag water outlet (36).

[0113] As Figure 4Schematic diagram of the overall structure of the low-temperature generator and condenser shown. The hot steam from the high-temperature generator becomes liquid water after releasing heat through the heat exchange coil (42) of the low-temperature generator, and enters the condenser (50) through the condenser inlet (51); the low-temperature lithium bromide solution is sent to the low-temperature heat exchanger (100) by the solution pump (P1) for heat release; the condensed water in the condenser is sent to the main inlet (72) of the evaporator by the circulating water pump (P5) through the condenser outlet (52); the cooling water in the condenser comes from the cold water tank (80), flows through the condenser coil (54), and then goes to the absorber coil inlet (63) through the condenser coil outlet (55); the steam in the low-temperature generator enters the condenser through the grille for condensation.

[0114] As Figure 5 Schematic diagram of the overall structure of the absorber and evaporator shown. The lithium bromide solution after releasing heat in the low-temperature heat exchanger (100) is sprayed into the absorber (60) through the low-temperature inlet (61) of the absorber; the lithium bromide solution after releasing heat in the high-temperature heat exchanger (110) is also sprayed into the absorber (60) through the high-temperature inlet (62) of the absorber; the cooling water from the condenser absorbs heat through the absorber coil (64) and is directly discharged to the cold water tank (80); after the dilute lithium bromide solution in the absorber is discharged through the outlet (66), a part of it is pumped to the inlet (44) of the dilute lithium bromide solution of the low-temperature generator, and the other part is sent to the inlet (15) of the dilute lithium bromide solution of the high-temperature generator after passing through the low-temperature and high-temperature heat exchangers in sequence. The condensed water from the condenser is throttled and depressurized by the throttle valve (120) and sprayed into the evaporator (70) through the main inlet (72) of the evaporator; the chilled water in the evaporator is sprayed into the evaporator (70) through the in-circulation inlet (71) of the evaporator by the refrigeration pump (P3), realizing the self-circulation process of the chilled water in the evaporator. The circulating water from the blast furnace cooling stave (90) enters the evaporator coil (74) through the blast furnace cooling stave circulating water evaporator inlet (75), achieving the effect of refrigeration and cooling, and finally flowing back to the cooling stave (90) through the blast furnace cooling stave circulating water evaporator outlet (73). Through the above full utilization of the waste heat of the blast furnace slag water, the refrigeration and cooling effect of the circulating water of the cooling stave is achieved, so that the cooling effect of the furnace wall can be better realized, and the blast furnace can operate for a longer life.

[0115] As Figure 6Schematic diagram of the overall structure of the shown slag water anti-scaling device (130), which includes a box cover (131), a box body (132), a screw propeller (134), a motor (135), a slag storage box (136), a slag removal net (137), and an electrodialysis box (138). The box cover (131) is arranged on the box body (132). A slag storage box (136) is provided at the bottom of the box body (132). The screw propeller (134) is arranged at the bottom of the box body (132), and one end of the rotating shaft of the screw propeller (134) passes through the box body (132) and is connected to the output end of the rotating shaft of the motor (135). The furnace slag (133) is arranged inside the box body (132). The slag storage box (136) stores solid slag through the slag removal net (137) to prevent the slag from entering the electrodialysis box (138). Under the action of the electric field of the battery and the internal cation exchange membrane and anion exchange membrane in the electrodialysis box (138), the cations and anions in the slag flushing water are stored in the electrodialysis box (138), so that the blast furnace slag flushing water leading to the water inlet (11) of the high-temperature evaporator is pure enough to prevent the slag flushing water from corroding the pipeline or forming scale.

[0116] As Figure 7 Schematic diagram of the overall structure of the shown steam ejector (140), which includes an ejector nozzle (142), an ejector suction chamber (143), an ejector suction pipe (144), a converging section of the ejector diffuser pipe (145), and a diverging section of the ejector diffuser pipe (146). An inlet steam pipe (141) is arranged inside the ejector suction chamber (143). The ejector nozzle (142) is installed on the inlet steam pipe. The ejector suction chamber (143) is respectively communicated with the ejector suction pipe (144) and the converging section of the ejector diffuser pipe (145). The converging section of the ejector diffuser pipe (145) is connected to the diverging section of the ejector diffuser pipe (146). The inlet steam pipe is connected to the steam inlet (41) of the low-temperature generator through a pipeline. The ejector suction pipe (144) is connected to the steam inlet (41) of the low-temperature generator through a pipeline. The diverging section of the ejector diffuser pipe (146) is connected to the steam inlet (41) of the low-temperature generator through a pipeline.

[0117] As Figure 8Schematic diagram of the overall structure of the shown water flow direction reversing valve group (150), which includes a first stop valve (151), a second stop valve (152), a third stop valve (153), and a fourth stop valve (154), all of which are electrically controlled stop valves, a first pipeline (155), a second pipeline (156), a diversion pipeline (158), a return pipeline (159), and an ultrasonic on-line scale prevention and removal device (157). The diversion pipeline (158) introduces water into the water flow direction reversing valve group and finally flows out from the return pipeline (159). When the first stop valve (151) and the fourth stop valve (154) are opened and the second stop valve (152) and the third stop valve (153) are closed, water passes through the diversion pipeline (158), through the fourth stop valve (154), flows through the first pipeline (155) and towards the second pipeline (156). The water passes through the heat exchanger from right to left, then flows from the second pipeline (156) to the first pipeline (155), passes through the first stop valve (151), and flows out from the return pipeline (159). When the second stop valve (152) and the third stop valve (153) are opened and the first stop valve (151) and the fourth stop valve (154) are closed, water passes through the diversion pipeline (158), through the third stop valve (153), flows through the first pipeline (155) and towards the second pipeline (156). The water passes through the heat exchanger from left to right, then flows from the second pipeline (156) to the first pipeline (155), passes through the second stop valve (152), and flows out from the return pipeline (159). When the system works, first send an opening signal to the two stop valves in the closed state, and after a delay of 10 to 20 s, then send a closing signal to the two stop valves in the original open state, so as to realize the function of reversing when the blast furnace slag flushing water enters the heat exchanger. During this process, the ultrasonic on-line scale prevention and removal device (157) performs scale removal treatment on the pipeline. And throughout the process, the water inlet is always the diversion pipeline (158), and the water outlet is always the return pipeline (159), but the direction of the water passing through the heat exchanger changes, preventing the reduction of heat exchange efficiency caused by the accumulation of scale.

[0118] As described above, it is only a preferred embodiment of the present invention, and it is not a limitation to the present invention in other forms. Any person skilled in the art can use the above-disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

1. A device for assisting refrigeration of cooling wall circulating water by using waste heat from slag flushing water in a blast furnace, which realizes refrigeration and cooling of cooling wall circulating water by using waste heat from slag flushing water, characterized in that: The invention comprises a slag water anti-scaling device (130), a high temperature generator (10), a standby high temperature generator (20), a low temperature flash evaporator (30), a steam ejector (140), a low temperature generator (40), a condenser (50), an absorber (60), an evaporator (70), a high temperature heat exchanger (110), a low temperature heat exchanger (100), a water flow reversing valve group (150), a throttle valve (120), a slag flushing water cooling pool (80), a blast furnace cooling wall (90), and a circulating pump. The refrigerant pair used is lithium bromide-water. The high-temperature slag flushing water flows through the slag water anti-scaling device, the high-temperature generator and the low-temperature flash evaporator in sequence, and the remaining cold water directly flows into the slag flushing water cooling pool. The slag water anti-scaling device is connected to the high-temperature slag flushing water inlet (11), the high-temperature generator steam outlet (16) and the low-temperature flash evaporator steam outlet (33 and 35) are both connected to the steam ejector (140), and are connected to the low-temperature generator steam inlet (41) through a pipeline. The lithium bromide concentrated solution in the high-temperature generator and the low-temperature generator is finally injected into the absorber, and the lithium bromide solution in the absorber After being diluted by the steam from the evaporator, it is pumped to the high-temperature generator and the low-temperature generator. The condenser outlet (52) is connected to the evaporator main inlet (72) via a throttle valve. The circulating cooling water is taken from the slag flushing water cooling pool. The inlet and outlet (53 and 55) of the condenser coil (54) are connected to the water flow reversing valve group (150). The blast furnace cooling wall circulating water pipeline flows through the evaporator and realizes refrigeration and cooling through the evaporator coil (74). The inlet and outlet (73 and 75) of the evaporator coil (74) are connected to the water flow reversing valve group (150).

2. The device according to claim 1, characterized in that After the high-temperature slag flushing water flows through the high-temperature generator heat exchange coil (12) to release heat, it enters the low-temperature flash evaporator, which is provided with a primary flash evaporation chamber (32) and a secondary flash evaporation chamber (34).

3. The device according to claim 1, characterized in that The backup high-temperature generator is a reactor that uses hot water generated by a solar water heater to heat a lithium bromide solution. It is a backup device for the high-temperature generator and is equipped with an intelligent control module to achieve precise temperature control.

4. The device according to claim 1, characterized in that The low-temperature generator and condenser are arranged as an integral device, and the absorber and evaporator are arranged as an integral device. Steam inside the device circulates through a grid. The lithium bromide solution in the low-temperature generator flows from an outlet (43) through a low-temperature heat exchanger (100) to release heat and then is sprayed onto the absorber. The low-temperature water in the condenser flows from an outlet (52) through a throttle valve (120) to release pressure and then is sprayed onto the evaporator.

5. The device according to claim 1, characterized in that The hot steam discharged from the high-temperature generator and the flash evaporator flows through the low-temperature generator heat exchange coil (42) to heat the lithium bromide solution and then turns into liquid water, and then directly enters the condenser through the pipeline via the condenser inlet (51). The hot lithium bromide solution discharged from the high-temperature generator is sprayed to the absorber after releasing heat through the high-temperature heat exchanger (110). Part of the dilute lithium bromide solution discharged from the absorber is pumped to the low-temperature generator through the dilute lithium bromide solution inlet (44) of the low-temperature generator, and the remaining solution is successively absorbed by the low-temperature and high-temperature heat exchangers and then pumped to the dilute lithium bromide solution inlet (15 or 24) of the high-temperature generator.

6. The device according to claim 1, characterized in that The circulating cooling water is directly taken from the slag flushing water cooling pool (80) and is pumped to the condenser and absorber in sequence for cooling. The blast furnace cooling wall circulating water flows through the evaporator coil (74) for cooling and is then transported to the blast furnace cooling wall (90) again.

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