Water vapor mixing type heat-stewed steel slag steam waste heat recovery device and method

Abstract

The invention discloses a water-vapor mixed heat-stewed steel slag steam waste heat recovery device and method, which can effectively store and utilize steam heat and realize online slag discharge of equipment at the same time. According to the technical scheme, the device comprises a cyclone dust remover, a steam-water mixed heat storage tank and a slag braising water special heat exchanger, the cyclone dust remover is connected with a steam outlet of the steel slag pressure heat stewing tank through a first steam pipeline, the cyclone dust remover is connected with a water tank slag stewing steam inlet in the top of the steam-water mixing heat storage tank, and the steam-water mixing heat storage tank is further provided with a water tank slag stewing water inlet and outlet. The water tank slag braising water inlet and outlet is connected with the slag braising water special heat exchanger; a noise elimination heater is further arranged in the steam-water mixing heat storage tank, the upper end of the noise elimination heater is connected with the slag braising steam inlet of the water tank, and a steam hole channel and a slag braising water discharge outlet are formed in a body of the noise elimination heater. The slag braising water special heat exchanger is connected with the heating medium water tank and the plate heat exchanger through hot water pipelines.

Description

Technical Field

[0001] The invention belongs to the technical field of steel slag treatment, and particularly relates to a steam waste heat recovery device and method for water-vapor mixed hot-smothered steel slag. Background Technique

[0002] The statements in this part only provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] During the steel slag treatment process, a large amount of steam is generated in the pressure hot-smothering tank of steel slag. In the traditional treatment method, these steams are often directly discharged, which not only causes energy waste, but also may have a certain impact on the environment due to the steam carrying slag dust, water vapor, etc. During the pressure hot-smothering treatment of steel slag, each pressure hot-smothering tank of steel slag will generate a large amount of discontinuous fluctuating steam, and the fluctuation range of its flow rate and pressure is extremely large. Due to the changes in steam production operations and steelmaking output, multiple slag-smothering tanks often produce steam or do not produce steam at the same time, resulting in discontinuous waste heat recovery for steam supply. In addition, in some water-vapor mixed waste heat recovery devices, a special water-steam mixer is not set for water-steam mixing heating, resulting in large vibrations and noises in the steam pipeline in the water tank, uneven water-steam mixing, low heating efficiency, and easy occurrence of equipment failures; the discontinuous steam causes large fluctuations in the liquid level in the water tank, making it difficult to control the liquid level in the water tank, and often resulting in overflow problems; the slag discharge design at the bottom of the water tank is inefficient, and the steel slag accumulates quickly, resulting in a short cleaning cycle of the water tank, affecting the use efficiency of the waste heat recovery system and causing waste of steam during the cleaning period. Summary of the Invention

[0004] Aiming at the above problems, the invention provides a steam waste heat recovery device and method for water-vapor mixed hot-smothered steel slag, realizes the waste heat recovery of the steam generated by the pressure hot-smothering tank of steel slag, effectively stores and utilizes the steam heat, can remove the slag dust in the steel-smothered slag steam in advance, and reduces the slag dust entering the water-steam mixing water tank; solves the problems of low water-steam mixing efficiency, vibration, large noise, and liquid level fluctuation, and improves the operation stability of the system. At the same time, the silencing heater adopts an efficient slag discharge design, reduces the maintenance frequency of slag dust cleaning during system shutdown, prolongs the non-stop operation time of the system, and improves the system utilization rate.

[0005] In order to achieve the above object, the invention is realized by the following technical solutions:

[0006] In a first aspect, the present invention provides a steam and water mixed type heat recovery device for hot stewing steel slag steam, which includes a pressure hot stewing tank for steel slag, a cyclone dust collector, a steam and water mixed heat storage tank, and a special heat exchanger for stewing slag water; a water injection port and a steam outlet are provided on the pressure hot stewing tank for steel slag; the pressure hot stewing tank for steel slag is also provided with a means for discharging steam and non-condensable gas to the original steam discharge pipeline; the cyclone dust collector is connected to the steam outlet of the pressure hot stewing tank for steel slag through a first steam pipeline, the cyclone dust collector is connected to the water tank stewing slag steam inlet at the top of the steam and water mixed heat storage tank through a second steam pipeline, a non-condensable gas discharge port is also provided at the top of the steam and water mixed heat storage tank, the non-condensable gas discharge port is connected with a third steam pipeline, and the un-recovered part of the steam is discharged into the original steam discharge pipeline, a water tank stewing slag water inlet and a water tank stewing slag water outlet are also provided at the side of the steam and water mixed heat storage tank, and the water tank stewing slag water inlet and the water tank stewing slag water outlet are connected to the special heat exchanger for stewing slag water through a stewing slag water circulation pipeline;

[0007] A silencing heater is also provided in the steam and water mixed heat storage tank, the upper end of the silencing heater is connected to the water tank stewing slag steam inlet, a steam hole channel is provided on the body of the silencing heater, and a stewing slag water discharge port is provided below the silencing heater;

[0008] The special heat exchanger for stewing slag water is respectively connected to a heat medium water tank and a plate heat exchanger through a hot water pipeline, and a closed loop is formed, and there is heat medium water in the hot water pipeline.

[0009] Furthermore, a demineralized water tank is connected to the plate heat exchanger through a demineralized water pipeline, a closed loop is formed by the demineralized water pipeline, the demineralized water tank and the plate heat exchanger, and there is demineralized water in the demineralized water pipeline.

[0010] Furthermore, the pressure hot stewing tank for steel slag is provided with a water injection control valve, a steam control valve, and a temperature gauge for the hot stewing tank. The water injection control valve is arranged at the water injection port end of the stewing slag tank, the steam control valve is arranged at the steam outlet end of the stewing slag tank, and the temperature and pressure gauges for the pressure hot stewing tank for steel slag are arranged at the upper part of the pressure hot stewing tank for steel slag.

[0011] Furthermore, guide vanes are arranged inside the cyclone dust collector, and an electric dust discharge valve is provided at the dust hopper at the bottom of the dust collector for discharging dust and slag.

[0012] Furthermore, a first steam switching valve is provided on the original steam discharge pipeline, and a second steam switching valve is provided on the third steam pipeline; a third steam switching valve is provided on the first steam pipeline.

[0013] Furthermore, a heat medium water circulation pump is arranged between the heat medium water tank and the steam and water mixed heat storage tank; a demineralized water inlet pipe is also provided on the demineralized water tank, and a total control valve for demineralized water inlet and a first demineralized water inlet switching valve are provided on the demineralized water pipeline.

[0014] Furthermore, the demineralized water pipeline is respectively connected to the demineralized water tank and the plate heat exchanger. The demineralized water pipeline intersects and communicates with the demineralized water pipeline, and the intersection position is between the total control valve for demineralized water inlet and the first switching valve for demineralized water inlet. A second switching valve for demineralized water inlet is provided near the plate heat exchanger of the demineralized water pipeline, and a reheating pump is provided near the demineralized water tank. An oxygen deaerator supply pump is further provided at the bottom end of the demineralized water tank.

[0015] Furthermore, an electric blowdown valve for slag quenching water is provided at the slag quenching water discharge port; a slag quenching water circulation pump is also provided on the slag quenching water circulation pipeline.

[0016] In a second aspect, the present invention also provides a method for recovering steam waste heat of a steam and water mixed type hot slag quenching steel slag steam waste heat recovery device, including:

[0017] Open the second steam switching valve and the third steam switching valve, close the first steam switching valve. The steam enters the cyclone dust collector and the steam-water mixing heat storage tank through the first steam pipeline. The slag quenching water heats the circulating heat transfer medium water, and the non-condensable gas in the slag quenching steam is discharged to the original steam release pipeline through the third steam pipeline;

[0018] During heat storage, the 120°C hot slag quenching steam continuously heats the 65°C slag quenching water to 95°C, and the 95°C slag quenching water stores heat in the steam-water mixing heat storage tank.

[0019] During heat release: The 95°C slag quenching water enters the special heat exchanger for slag quenching water, heats the heat transfer medium water from 50°C to 90°C, and the 90°C heat transfer medium water then enters the plate heat exchanger to heat the demineralized water from 25°C to 85°C for heat release. The temperature of the continuously heat-releasing slag quenching water continuously decreases. In the actual application process, there is also a situation where the heat storage process and the heat release process operate simultaneously.

[0020] Furthermore, when the slag and dust in the silencer heater are regularly discharged during the operation of the entire device, open the electric blowdown valve for slag quenching water. The slag and dust will be discharged with the slag quenching water to realize the function of on-line blowdown, and at the same time, the steam condensate is discharged to ensure the liquid level balance of the water tank.

[0021] Compared with the prior art, the advantages and positive effects of the present invention are:

[0022] The waste heat recovery system of the present invention, which consists of a heat medium water tank, a plate heat exchanger, a special heat exchanger for slag quenching water, and a steam-water mixing heat storage tank, can store the waste heat of the pressurized hot slag quenching steam of steel slag and use it to heat demineralized water, etc., significantly improving the energy utilization rate. A cyclone dust collector is provided to perform pre-dust removal treatment on the slag quenching steam, reducing the slag and dust entering the silencer heater, extending the service life of the silencer heater, and extending the maintenance-free operation time of the system. A special steam-water silencer heater is provided to solve the problems of low steam-water mixing efficiency, equipment vibration, high noise, and liquid level fluctuation in the prior art, improving the operation stability of the system. At the same time, the silencer heater adopts an efficient slag discharge design, reducing the maintenance frequency of slag and dust cleaning during system shutdown, extending the non-stop operation time of the system, and improving the system utilization rate.

[0023] The waste heat recovery device of the present invention can use the heat of the hot slag quenching steam at 120°C to heat the slag quenching water at 65°C to 95°C for heat storage, and then heat the demineralized water from 25°C to 85°C through the heat exchange process, realizing the efficient recovery and utilization of energy and saving steam. The waste heat recovery device is also provided with a plurality of switching valves and a standby operation mode. When the demineralized water tank is replenished with water, different paths can be selected through different switching valves, and the operation mode can be quickly switched in case of equipment failure, ensuring the safety of converter production and the stable operation of the system. At the same time, the setting of equipment such as a reheating pump can increase the preheating temperature of the demineralized water and further optimize the system performance. Brief Description of the Drawings

[0024] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0025] Figure 1 It is a diagram of the steam and water mixing type hot slag quenching steam waste heat recovery device of the present invention;

[0026] Figure 2 It is a structural diagram of the steam-water mixing heat storage tank of the present invention.

[0027] In the figure: 1. Slag autoclave; 2. Water pumping control valve; 3. Steam control valve; 4. First steam switching valve; 5. Raw steam release pipe; 6. Second steam switching valve; 7. Steam-water mixed heat storage tank; 7-1. Non-condensable gas discharge port; 7-2. Slag steam inlet of water tank; 7-3. Slag water inlet of water tank; 7-4. Slag water outlet of water tank; 7-5. Noise-absorbing heater; 7-6. Slag water discharge port; 8. Slag water electric drain valve; 9. Heat medium water circulation pump; 10. Heat medium water tank; 11. Deaerator water supply pump; 12. Desalted water tank; 1 3. Reheat pump; 14. Desalted water inlet main control valve; 15. Desalted water inlet pipe; 16. Second desalted water inlet switching valve; 17. First desalted water inlet switching valve; 18. Plate heat exchanger; 19. Electric dust exhaust valve; 20. Cyclone dust collector; 21. Third steam switching valve; 22. First steam pipeline; 23. Second steam pipeline; 24. Third steam pipeline; 25. Hot water pipeline; 26. Desalted water pipeline; 27. Temperature and pressure instruments; 28. Slag stewing water circulation pump; 29. ​​Slag stewing water circulation pipeline; 30. Special heat exchanger for slag stewing water. DETAILED DESCRIPTION

[0028] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0030] This embodiment provides a water-steam mixed hot stewed steel slag steam waste heat recovery device, such as Figure 1 - Figure 2As shown in the figure, it includes a pressurized hot smelting tank for steel slag 1, a cyclone dust collector 20, a steam-water mixing heat storage tank 7, and a special heat exchanger for slag smelting water 30; a water injection port and a steam outlet are provided on the pressurized hot smelting tank for steel slag 1; the pressurized hot smelting tank for steel slag 1 is also provided with a device for discharging steam and non-condensable gas to the original steam discharge pipeline 5; the cyclone dust collector 20 is connected to the steam outlet of the pressurized hot smelting tank for steel slag 1 through a first steam pipeline 22, the cyclone dust collector 20 is connected to the water tank slag smelting steam inlet 7-2 at the top of the steam-water mixing heat storage tank 7 through a second steam pipeline 23, a non-condensable gas discharge port 7-1 is also provided at the top of the steam-water mixing heat storage tank 7, the non-condensable gas discharge port 7-1 is connected with a third steam pipeline 24, and the remaining steam is discharged into the original steam discharge pipeline 5. A water tank slag smelting water inlet 7-3 and a water tank slag smelting water outlet 7-4 are provided on the side of the steam-water mixing heat storage tank 7, and the water tank slag smelting water inlet 7-3 and the water tank slag smelting water outlet 7-4 are connected to the special heat exchanger for slag smelting water 30 through a slag smelting water circulation pipeline 29;

[0031] A silencing heater 7-5 is also provided in the steam-water mixing heat storage tank 7. The upper end of the silencing heater 7-5 is connected to the water tank slag smelting steam inlet 7-2. The structural design of the silencing heater can realize the entrainment of slag smelting steam and slag smelting water, and efficiently realize the steam-water mixing and heating. The silencing heater is provided with a slag and dust product hopper, and a slag smelting water discharge port 7-6 is provided below the silencing heater 7-5. After the slag smelting steam enters the silencing heater 7-5, the steam is mixed with the slag smelting water, and the steam is cooled into water. Most of the slag and dust are deposited in the slag hopper at the bottom of the silencing heater 7-5 under the action of inertial force. A small part of the slag water enters the steam-water mixing heat storage tank through the steam hole channel and is deposited at the bottom of the steam-water mixing heat storage tank. During the operation of the system, the slag smelting water electric blowdown valve 8 is regularly opened, and the slag and dust in the slag hopper are discharged together with the slag smelting water; the steam-water mixing heat storage tank 7 has a heat storage function, which solves the problem that the generation of slag smelting steam and the heating requirement of demineralized water do not occur simultaneously, and realizes the heat coupling between the heat source end and the demand end; the heat storage capacity of the heat storage tank is designed to meet the heating amount of demineralized water for 2 hours. The height-diameter ratio of the heat storage tank 10 is designed to be 2:1. The slag smelting water inlet is arranged at the bottom of the water tank, and the slag smelting water outlet is arranged in the middle of the water tank, and the inlet and outlet are symmetrically arranged to make the flow direction of the hot water scientific and reasonable, and a reasonable internal partition is designed to make the heat storage water tank have a stable thermocline and give full play to the maximum heat storage capacity of the heat storage water tank.

[0032] The heat medium water tank 10 is respectively connected to the special heat exchanger for slag smelting water 30 and the plate heat exchanger 18 through a hot water pipeline 25, and a closed loop is formed, and there is heat medium water in the hot water pipeline 25.

[0033] The demineralized water tank 12 is connected to the plate heat exchanger 18 through a demineralized water pipeline 26. The demineralized water pipeline 26, the demineralized water tank 12 and the plate heat exchanger 18 form a closed loop, and there is demineralized water in the demineralized water pipeline 26.

[0034] The pressure-holding hot-smothering tank 1 for steel slag is provided with a water injection control valve 2, a steam control valve 3, and a temperature and pressure instrument 27. The water injection control valve 2 is arranged at the water injection port end of the slag-smothering tank, the steam control valve 3 is arranged at the steam outlet end of the slag-smothering tank, and the temperature and pressure instrument 27 is arranged at the upper part of the pressure-holding hot-smothering tank for steel slag; a plurality of pressure-holding slag-smothering tanks for steel slag are provided.

[0035] The cyclone dust collector 20 is used to remove at least 70% of the particulate slag dust with a diameter of more than 1 mm in the slag-smothering steam. A guide vane is arranged inside the cyclone dust collector 20, and an electric dust discharge valve 19 is arranged at the dust hopper at the bottom of the dust collector for dust and slag discharge.

[0036] A first steam switching valve 4 is arranged on the original steam discharge pipeline 5, and a second steam switching valve 6 is arranged on the third steam pipeline 24; a third steam switching valve 21 is arranged on the first steam pipeline 22.

[0037] A hot medium water circulation pump 9 is arranged between the hot medium water tank 10 and the steam-water mixing heat storage tank 7; a demineralized water inlet pipe 15 is further arranged on the demineralized water tank 12, and a demineralized water inlet main control valve 14 and a first demineralized water inlet switching valve 17 are arranged on the demineralized water pipeline 26. One or more plate heat exchangers 18 can be used simultaneously and are suitable for working conditions where the steel slag-smothering steam contains impurities, chloride ions, etc., and have the characteristics of being resistant to blockage, impact wear, corrosion, and scale formation.

[0038] The demineralized water pipeline 26 is respectively connected to the demineralized water tank 12 and the plate heat exchanger 18, heats the demineralized water through the hot medium water, and at the same time isolates the steam from the demineralized water to prevent the slag-smothering steam from polluting the quality of the demineralized water and affecting the service life of the vaporization cooling flue; the demineralized water pipeline 26 and the demineralized water pipeline cross and communicate, and the crossing position is between the demineralized water inlet main control valve 14 and the first demineralized water inlet switching valve 17; a second demineralized water inlet switching valve 16 is arranged near the plate heat exchanger 18 on the demineralized water pipeline 26, and a reheating pump 13 is arranged near the demineralized water tank 12. The reheating pump 13 is used for the reheating of the demineralized water circulation and the reheating of the demineralized water after the overhaul of the steelmaking production, so as to improve the preheating temperature of the demineralized water as much as possible, save more steam, and generate the maximum benefit.

[0039] A deaerator water supply pump 11 is further arranged at the bottom end of the demineralized water tank 12.

[0040] A slag-smothering water electric drain valve 8 is further arranged at the slag-smothering water discharge port 7-6; a slag-smothering water circulation pump 28 is further arranged on the slag-smothering water circulation pipeline 29.

[0041] The present invention also provides a method for recovering the waste heat of the pressure-holding hot-smothering steam of steel slag, including:

[0042] Open the second steam switching valve 6 and the third steam switching valve 21, close the first steam switching valve 4. Steam enters the cyclone dust collector 20 and the steam-water mixing heat storage tank 7 through the first steam pipeline 22. The steam heats the circulating heat medium water, and the non-condensable gas in the steam is discharged to the hot smelting return water well through the third steam pipeline 24;

[0043] During heat storage, the 120°C hot smelting slag steam continuously heats the 65°C smelting slag water to 95°C, and the 95°C smelting slag water is stored in the steam-water mixing heat storage tank 7;

[0044] During heat release: The 95°C smelting slag water enters the special heat exchanger 30 for smelting slag water, heating the heat medium water from 50°C to 90°C. The 90°C heat medium water then enters the plate heat exchanger 18 to heat the demineralized water from 25°C to 85°C for heat release, and the temperature of the continuously heat-releasing smelting slag water decreases continuously. In the actual application process, there is also a situation where the heat storage process and the heat release process run simultaneously.

[0045] When the demineralized water tank 12 needs to be replenished, open the second demineralized water inlet switching valve 16. The demineralized water directly enters the plate heat exchanger 18 for heating and then enters the demineralized water tank 12; when the demineralized water preheating recovery device fails, open the first demineralized water inlet switching valve 17 and close the second demineralized water inlet switching valve 16, and the demineralized water can be quickly switched to directly enter the demineralized water tank 12 to ensure the safety of converter production.

[0046] When regularly discharging the slag and dust in the silencer heater 7-5 during the operation of the entire device, open the electric blowdown valve 8 for smelting slag water. The smelting slag will be discharged under the drive of the smelting slag water, realizing the function of on-line blowdown. At the same time, the steam condensate is discharged, ensuring the liquid level balance of the water tank.

[0047] Since a demister is provided in the non-condensable gas outlet pipeline, its function is to absorb and intercept the moisture carried by the non-condensable gas. The moisture absorbed by the demister falls back to the steam-water mixing heat storage tank under the action of gravity, improving the water reuse efficiency.

[0048] Although the specific implementation manners of the present invention are described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that based on the technical solutions of the present invention, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the present invention.

Claims

1. A water-steam mixed hot stewed steel slag steam waste heat recovery device, characterized in that: It comprises a slag autoclave, a cyclone dust collector, a steam-water mixed heat storage tank and a special heat exchanger for slag water; the slag autoclave is provided with a water inlet and a steam outlet; the slag autoclave is also provided with a pipeline for discharging steam and non-condensable gas to an original steam release; the cyclone dust collector is connected to the steam outlet of the slag autoclave through a first steam pipeline, the cyclone dust collector is connected to the water tank slag steam inlet at the top of the steam-water mixed heat storage tank through a second steam pipeline, the top of the steam-water mixed heat storage tank is also provided with a non-condensable gas discharge port, the non-condensable gas discharge port is connected to a third steam pipeline, and part of the steam not recovered is discharged into the original steam release pipeline, the side of the steam-water mixed heat storage tank is also provided with a water tank slag water inlet and a water tank slag water outlet, the water tank slag water inlet and the water tank slag water outlet are connected to the special heat exchanger for slag water through a slag water circulation pipeline; The steam-water mixed heat storage tank is also provided with a silencing heater, the upper end of which is connected to the slag steam inlet of the water tank, the body of which is provided with a steam hole channel, and a slag water discharge port is provided below the silencing heater; The dedicated heat exchanger for slag stewing water is connected to the heat medium water tank and the plate heat exchanger respectively through hot water pipes to form a closed loop, and there is heat medium water in the hot water pipes.

2. A water-steam mixed hot stewed steel slag steam waste heat recovery device as claimed in claim 1, characterized in that: The desalted water tank is connected to the plate heat exchanger via a desalted water pipeline. The desalted water pipeline, the desalted water tank and the plate heat exchanger form a closed loop. The desalted water pipeline contains desalted water.

3. The water-steam mixed hot stewed steel slag steam waste heat recovery device according to claim 1, characterized in that: The steel slag autoclave is provided with a water supply control valve, a steam control valve and a hot stewing tank temperature meter. The water supply control valve is arranged at the water supply port end of the slag stewing tank, the steam control valve is arranged at the steam outlet end of the slag stewing tank, and the upper part of the steel slag autoclave is provided with the steel slag autoclave temperature and pressure meter.

4. The water-steam mixed hot stewed steel slag steam waste heat recovery device according to claim 1, characterized in that: A guide vane is arranged inside the cyclone, and an electric dust discharge valve is provided at the dust hopper at the bottom of the dust collector for dust and slag discharge.

5. The water-steam mixed hot stewed steel slag steam waste heat recovery device according to claim 1, characterized in that: The original steam release pipeline is provided with a first steam switching valve, the third steam pipeline is provided with a second steam switching valve; the first steam pipeline is provided with a third steam switching valve.

6. The water-steam mixed hot stewed steel slag steam waste heat recovery device according to claim 1, characterized in that: A heat medium water circulation pump is arranged between the heat medium water tank and the steam-water mixed heat storage tank; a desalted water tank is also provided with a desalted water inlet pipe, and a desalted water inlet main control valve and a first desalted water inlet switching valve are arranged on the desalted water pipeline.

7. A water-steam mixed hot stewed steel slag steam waste heat recovery device as claimed in claim 6, characterized in that: The desalted water pipeline is connected to the desalted water tank and the plate heat exchanger respectively. The desalted water pipeline and the desalted water pipeline are crossed and connected. The crossing position is between the desalted water inlet main control valve and the first desalted water inlet switching valve. The desalted water pipeline is provided with a second desalted water inlet switching valve near the plate heat exchanger, and a reheat pump is provided near the desalted water tank; a deaerator water supply pump is also provided at the bottom end of the desalted water tank.

8. The water-steam mixed hot stewed steel slag steam waste heat recovery device according to claim 1, characterized in that: The slag-stewing water discharge port is also provided with an electric drain valve for slag-stewing water; and the slag-stewing water circulation pipeline is also provided with a slag-stewing water circulation pump.

9. A steam waste heat recovery method based on a water-steam mixed hot stewed steel slag steam waste heat recovery device according to any one of claims 1 to 8, characterized in that: include: Open the second steam switching valve and the third steam switching valve, close the first steam switching valve, and the steam enters the cyclone dust collector and the steam-water mixed heat storage tank through the first steam pipeline. The slag stewing water heats the circulating heat medium water, and the non-condensable gas in the slag stewing steam is discharged from the third steam pipeline to the original steam release pipeline; During heat storage, the 120℃ hot slag steam continuously heats the 65℃ slag water to 95℃, and the 95℃ slag water is stored in the steam-water mixed heat storage tank; During heat release: 95℃ stewing slag water enters the special heat exchanger for stewing slag water, and the heat medium water is heated from 50℃ to 90℃. The 90℃ heat medium water then enters the plate heat exchanger, and the desalted water is heated from 25℃ to 85℃ for heat release. The temperature of the stewing slag water is continuously reduced by continuous heat release. In actual application, there is also a situation where the heat storage process and the heat release process run simultaneously.

10. The steam waste heat recovery method according to claim 9, characterized in that: When the entire device is in operation and discharges the slag dust in the silencer heater at a regular interval, the slag water electric drain valve is opened, and the slag dust will be discharged under the drive of the slag water, thereby realizing the function of online draining, and at the same time, the steam condensate water is discharged to ensure the liquid level balance of the water tank.

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