A steel slag treatment system

Abstract

This invention provides a steel slag treatment system, including a hot slag annealing device and a roller crushing device. The hot slag annealing device is provided with a hot slag steam outlet. It also includes a steam drum device, which is provided with a steam inlet, a feedwater inlet, a steam outlet, and a water outlet. A hot slag steam channel is provided between the steam outlet and the feedwater inlet. A hot slag annealing water inlet is provided on the hot slag annealing device, and a return water channel is provided between the water outlet and the feedwater inlet. This steel slag treatment system can purify the steel slag steam generated in the hot slag annealing device to obtain clean steam for power generation.

Description

Technical Field

[0001] This invention relates to energy recovery technology in the field of metallurgy, particularly energy recovery technology for steel slag generated during steel smelting. Background Technology

[0002] Steel slag is a solid byproduct generated during steel smelting. my country has a large steel production, resulting in a correspondingly large amount of steel slag. This large quantity of steel slag cannot be directly discarded and requires treatment. Domestically and internationally, technologies such as hot quenching, roller pressing, and air quenching are commonly used to treat steel slag, with hot quenching currently being the mainstream technology in my country. Among these, the steel slag roller crushing waste heat pressure hot quenching technology has become the mainstream technology in China due to its advantages such as high steel slag pulverization rate, short quenching time, high degree of automation, high degree of cleanliness, and high production efficiency.

[0003] The pressurized hot tempering technology for steel slag roller crushing mainly includes steps such as tilting molten steel slag, roller crushing, slag pushing, transfer, and pressurized hot tempering. In the roller crushing step, the roller crusher reciprocates to crush the steel slag, while simultaneously spraying water onto the slag to achieve rapid cooling and crushing of the molten steel slag. The pressurized hot tempering step further breaks down and disintegrates the steel slag in a sealed pressurized hot tempering tank, improving its stability for subsequent resource utilization.

[0004] In the aforementioned two main steps of roller crushing and pressurized quenching, a large amount of steam and heat energy is not properly utilized and is mostly released directly or indirectly into the environment. Therefore, it is desirable to recover and utilize the energy generated in the above-mentioned steel slag treatment process. For example, Chinese invention patent application (application number: 201610789023.4) entitled "A process and apparatus for generating electricity using steam generated during the pressurized quenching process of steel slag" discloses a technical solution for recovering and utilizing the energy contained in steel slag, aiming to use the steam generated during the pressurized quenching process of steel slag for power generation. In the above-mentioned existing technical solutions for recovering steel slag energy, because steel slag steam contains a large amount of dust and impurities, if it is directly introduced into the power generation equipment, it is easy to cause problems such as pipe blockage and metal corrosion, making the reliability of the corresponding energy recovery system extremely low, or even unable to work properly. Summary of the Invention

[0005] To address the problem that existing steel slag energy recovery technologies cannot function properly due to the presence of dust and impurities in steel slag steam, this invention provides a steel slag treatment system.

[0006] The technical solution of the present invention is as follows:

[0007] A steel slag treatment system includes a hot smelting tank device and a roller crushing device. The hot smelting tank device is provided with a hot smelting steam outlet. The system also includes a steam drum device, which is provided with a steam drum inlet, a steam drum feedwater inlet, a steam drum outlet, and a steam drum water outlet. A hot smelting steam channel is provided between the hot smelting steam outlet and the steam drum inlet. The hot smelting tank device is provided with a hot smelting tank water inlet, and a return water channel is provided between the steam drum water outlet and the hot smelting tank water inlet.

[0008] Optionally, the roller crushing device includes a cylindrical cavity; the sidewall of the cylindrical cavity is parallel to the direction of gravity; a load-bearing screen is provided inside the cylindrical cavity; the load-bearing screen divides the cylindrical cavity into two spaces in the direction of gravity: a first space above the direction of gravity and a second space below the direction of gravity; a screen-type heat exchange surface and a crushing roller are provided in the first space; a water-cooled wall is provided on the sidewall of the cylindrical cavity; a water-cooled wall inlet is provided below the direction of gravity of the water-cooled wall; a water-cooled wall outlet is provided above the direction of gravity of the water-cooled wall; and a screen-type heat exchange surface outlet and a screen-type heat exchange surface inlet are provided on the screen-type heat exchange surface.

[0009] Optionally, the crushing roller is frustum-shaped; the smaller end of the crushing roller is located near the central axis of the cylindrical cavity; the larger end of the crushing roller is located near the water-cooled wall; the crushing roller is capable of rotating about the central axis of the cylindrical cavity as the center of rotation and about the generatrix of the frustum shape as the radius of rotation.

[0010] Optionally, a liquid spray nozzle is provided in the second space, facing the load-bearing screen.

[0011] Optionally, the spray nozzle is provided on the central axis of the cylindrical cavity; and / or the spray nozzle is provided on the side wall of the cylindrical cavity.

[0012] Optionally, the steel slag treatment system includes a power generation device, which is provided with a power generation device fluid inlet and a power generation device fluid outlet; the steam exhaust outlet of the steam drum is connected to the power generation device fluid inlet.

[0013] Optionally, the steam outlet of the steam drum is connected to the inlet of the screen-type heat exchange surface; the outlet of the screen-type heat exchange surface is connected to the fluid inlet of the power generation device.

[0014] Optionally, the steel slag treatment system further includes a condenser, which has a condenser inlet and a condenser outlet; the fluid outlet of the power generation unit is connected to the condenser inlet; the condenser outlet is connected to the water-cooled wall inlet; and the water-cooled wall outlet is connected to the steam drum feedwater inlet.

[0015] Optionally, the condenser outlet is connected to the water inlet of the hot vent tank.

[0016] Optionally, the steel slag treatment system includes a first heat exchanger and a second heat exchanger; the first heat exchanger is provided with a first circulation inlet, a first circulation outlet, a second circulation inlet, and a second circulation outlet; the second heat exchanger is provided with a second circulation inlet, a second circulation outlet, a second circulation inlet, and a second circulation outlet; the first circulation outlet of the first heat exchanger is connected to the first circulation inlet of the second heat exchanger; the first circulation outlet of the second heat exchanger is connected to the water-cooled wall inlet; the first circulation outlet of the second heat exchanger is connected to the hot-cooled tank inlet; the water-cooled wall outlet is connected to the steam drum feedwater inlet; and the steam drum steam outlet is connected to the first circulation inlet of the first heat exchanger.

[0017] Optionally, the steel slag treatment system includes a power generation device with a fluid inlet and a fluid outlet; it also includes a third heat exchanger with a third inlet and a third outlet; the fluid outlet of the power generation device is connected to the inlet of the third heat exchanger; the outlet of the third heat exchanger is connected to the second circulation inlet of the second heat exchanger; the second circulation outlet of the second heat exchanger is connected to the second circulation inlet of the first heat exchanger; the second circulation outlet of the first heat exchanger is connected to the inlet of the screen-type heat exchange surface; and the outlet of the screen-type heat exchange surface is connected to the fluid inlet of the power generation device.

[0018] Optionally, the first circulation outlet of the second heat exchanger is connected to the inlet of the screen-type heat exchange surface; the outlet of the screen-type heat exchange surface is connected to the steam inlet of the steam drum.

[0019] Optionally, the steel slag treatment system includes a power generation device with a fluid inlet and a fluid outlet; it also includes a third heat exchanger with a third inlet and a third outlet; the fluid outlet of the power generation device is connected to the inlet of the third heat exchanger; the outlet of the third heat exchanger is connected to the second circulation inlet of the second heat exchanger; the second circulation outlet of the second heat exchanger is connected to the second circulation inlet of the first heat exchanger; and the second circulation outlet of the first heat exchanger is connected to the fluid inlet of the power generation device.

[0020] Optionally, the steam drum device includes a segmented steam drum, which comprises a salt section and a clean section; the steam inlet of the steam drum is located at the inlet of the clean section steam-water separator within the clean section; the steam outlet of the steam drum includes a clean section steam drum steam outlet located in the clean section and a salt section steam drum steam outlet located in the salt section; the water outlet of the steam drum includes a clean section steam drum water outlet located in the clean section and a salt section steam drum water outlet located in the salt section; the clean section steam drum water outlet is connected to the water inlet of the hot sump tank; the salt section steam drum water outlet is connected to the inlet of the water-cooled wall; and the water-cooled wall outlet is connected to the inlet of the salt section steam-water separator located within the salt section.

[0021] Optionally, the steel slag treatment system includes a power generation device, which is provided with a power generation device fluid inlet and a power generation device fluid outlet; the steam exhaust outlet of the steam drum is connected to the power generation device fluid inlet.

[0022] Optionally, the steam outlet of the salt section steam drum is connected to the fluid inlet of the power generation unit; the steam outlet of the clean section steam drum is connected to the inlet of the screen-type heat exchange surface; and the outlet of the screen-type heat exchange surface is connected to the fluid inlet of the power generation unit.

[0023] Optionally, the steel slag treatment system further includes a condenser, which has a condenser inlet and a condenser outlet; the fluid outlet of the power generation unit is connected to the condenser inlet; the condenser outlet is connected to the steam drum feedwater inlet; and the steam drum feedwater inlet is located on the clean section.

[0024] Optionally, the condenser outlet is connected to the water inlet of the hot vent tank.

[0025] Optionally, the steel slag treatment system includes a first heat exchanger and a second heat exchanger; the first heat exchanger is provided with a first circulation inlet, a first circulation outlet, a second circulation inlet, and a second circulation outlet; the second heat exchanger is provided with a second circulation inlet, a second circulation outlet, a second circulation inlet, and a second circulation outlet; the first circulation outlet of the first heat exchanger is connected to the first circulation inlet of the second heat exchanger; the first circulation outlet of the second heat exchanger is connected to the steam drum feedwater inlet; the first circulation outlet of the second heat exchanger is connected to the hot-filled tank inlet; and the steam drum steam outlet is connected to the first circulation inlet of the first heat exchanger.

[0026] Optionally, the steam outlet of the clean section steam drum is connected to the inlet of the screen-type heat exchange surface; the outlet of the screen-type heat exchange surface is connected to the first circulation inlet of the first heat exchanger.

[0027] Optionally, the steel slag treatment system includes a power generation device with a fluid inlet and a fluid outlet; it also includes a third heat exchanger with a third inlet and a third outlet; the fluid outlet of the power generation device is connected to the inlet of the third heat exchanger; the outlet of the third heat exchanger is connected to the second circulation inlet of the second heat exchanger; the second circulation outlet of the second heat exchanger is connected to the second circulation inlet of the first heat exchanger; and the second circulation outlet of the first heat exchanger is connected to the fluid inlet of the power generation device.

[0028] Optionally, a filter is provided in the hot steam passage.

[0029] The technical effects of this invention are as follows:

[0030] The steel slag treatment system of this invention introduces steam generated from the spraying of water onto the steel slag in a hot slag-filled container into a steam drum. The steam drum is equipped with a steam-water separator, a steam cleaning device, and other equipment, which effectively perform steam-water separation, steam cleaning, chemical dosing, and wastewater discharge to ensure steam quality. Therefore, the steel slag treatment system of this invention can purify the steel slag steam generated in the hot slag-filled container to obtain clean steam for power generation, thus achieving the objective of this invention.

[0031] In addition, the steam drum unit can act as a buffer when the load of the steel slag treatment system changes, so as to ensure stable steam output.

[0032] The further effects of the above-mentioned alternative methods will be explained in detail below with reference to specific implementation methods. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of an embodiment of the roller crushing device of the present invention.

[0034] Figure 2 This is a schematic diagram of the structure of the first embodiment of the steel slag treatment system of the present invention.

[0035] Figure 3 This is a schematic diagram of the structure of the second embodiment of the steel slag treatment system of the present invention.

[0036] Figure 4 This is a structural schematic diagram of the third embodiment of the steel slag treatment system of the present invention.

[0037] Figure 5 This is a structural schematic diagram of the fourth embodiment of the steel slag treatment system of the present invention.

[0038] Figure 6 This is a structural schematic diagram of the fifth embodiment of the steel slag treatment system of the present invention.

[0039] The markings in the image are explained as follows:

[0040] 101. Flue gas exhaust channel; 102. Gas collection hood; 103. Screen-type heat exchange surface; 104. Central shaft; 105. Crushing roller; 106. Liquid spray nozzle; 107. Load-bearing screen; 108. Crushing roller; 109. Liquid spray nozzle; 110. Water-cooled wall;

[0041] 201. Power generation unit; 202. Condenser; 203. Hot condenser unit; 204. Primary filter; 205. Secondary filter; 206. Drain outlet; 207. Steam drum unit;

[0042] 301. First heat exchanger; 302. Power generation unit; 303. Third heat exchanger; 304. Second heat exchanger; 305. Hot sealing tank device; 306. Primary filter; 307. Secondary filter; 308. Drain outlet; 309. Steam drum device;

[0043] 401. First heat exchanger; 402. Power generation unit; 403. Third heat exchanger; 404. Second heat exchanger; 405. Hot sealing tank device; 406. Primary filter; 407. Secondary filter; 408. Drain outlet; 409. Steam drum device;

[0044] 501. Salt section; 502. Salt section steam-water separator; 503. Clean section steam-water separator; 504. Clean section; 505. Power generation unit; 506. Condenser; 507. Hot sealing tank device; 508. Primary filter; 509. Secondary filter; 510. Segmented steam drum device;

[0045] 601. Salt section; 602. Salt section steam-water separator; 603. Clean section steam-water separator; 604. Clean section; 605. First heat exchanger; 606. Power generation unit; 607. Third heat exchanger; 608. Second heat exchanger; 609. Hot sealing tank device; 610. Primary filter; 611. Secondary filter; 612. Segmented steam drum device. Detailed Implementation

[0046] The technical solution of the present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings.

[0047] Figure 1 The structure of an example of a roller crushing device in the steel slag treatment system of the present invention is shown. For example... Figure 1 As shown, the roller crusher includes a cylindrical cavity. To facilitate demonstration of the internal structure of the roller crusher, Figure 1 The structure is shown in a sectional view, obscuring half of the cylindrical cavity's sidewalls. For example... Figure 1 As shown, the sidewall of the cylindrical cavity is perpendicular to the direction of gravity (i.e., Figure 1The cylindrical cavity is parallel to the cylindrical cavity in the vertical direction. Several steel pipes with axes parallel to the direction of gravity are arranged on the inner side of the sidewall. A heat exchange fluid medium, such as water, can flow through these steel pipes. These steel pipes surround the inner side of the cylindrical cavity to form a water-cooled wall 110. The water-cooled wall 110 can be a membrane water-cooled wall of existing technology. A water-cooled wall inlet (not shown in the figure) is provided below the direction of gravity of the water-cooled wall 110; a water-cooled wall outlet (not shown in the figure) is provided above the direction of gravity of the water-cooled wall. The heat exchange fluid medium enters the water-cooled wall 110 through the water-cooled wall inlet and flows out of the water-cooled wall 110 through the water-cooled wall outlet. During its flow through the water-cooled wall 110, the heat exchange fluid medium exchanges heat with the material inside the cylindrical cavity.

[0048] like Figure 1 As shown, a load-bearing screen 107 is installed inside the cylindrical cavity. The load-bearing screen 107 is a screen that allows particles of a certain size to pass through, and its structure can withstand considerable gravity and pressure. In the direction of gravity, the load-bearing screen 107 divides the cylindrical cavity into two spaces: a first space above gravity and a second space below gravity. Several sets of screen-type heat exchange surfaces 103 and crushing rollers 105 are installed in the first space. The screen-type heat exchange surface 103 is a heat exchange device composed of pipes for the flow of heat exchange fluid medium, which enables the heat exchange fluid medium flowing therein to exchange heat with the material inside the cylindrical cavity. The screen-type heat exchange surface 103 is provided with a screen-type heat exchange surface outlet and a screen-type heat exchange surface inlet (not shown in the figure). The screen-type heat exchange surface 103 is suspended in the first space. The crushing rollers 105 are located above the load-bearing screen 107 in the direction of gravity. The crushing rollers 105 are frustum-shaped. A frustum is a geometric body formed by rotating a right trapezoid around the line containing its legs perpendicular to the base as the axis of rotation, with the remaining sides forming curved surfaces. The legs of the right trapezoids at various positions on the side of the frustum are called the generatrices of the frustum. The smaller end of the frustum-shaped crushing roller 105 is positioned near the central axis 104 of the cylindrical cavity; the larger end is positioned near the water-cooled wall 110. The frustum-shaped crushing roller 105 can rotate on its own axis about the center of rotation of its frustum shape, and it can also revolve around the central axis 104 with the generatrices of the frustum as the radius of rotation. This arrangement of the crushing roller 105 allows it to press the steel slag carried on the load-bearing screen 107 through a combination of rotation and revolution. At the bottom of the second space in the direction of gravity, a crushing roller 108 with the same structure and function as the crushing roller 105 is also provided.

[0049] like Figure 1As shown, a liquid spray nozzle 109 is provided on the central axis 104 in the second space, and a liquid spray nozzle 106 is provided on the inner wall of the cylindrical cavity (i.e., at the water-cooled wall 110). Both the liquid spray nozzles 106 and 109 are oriented towards the load-bearing screen 107, and the cooling water sprayed from the liquid spray nozzles 106 and 109 can spray and cover the lower surface of the load-bearing screen 107 in the direction of gravity.

[0050] The following is through the analysis of Figure 1 The working process of the embodiment of the roller crushing device of the present invention is described to further illustrate the technical solution of the present invention.

[0051] The steel slag to be processed enters the first space through an inlet (not shown in the figure) located above the cylindrical cavity. The steel slag falls onto the load-bearing screen 107 and is crushed into finer particles by the crushing roller 105. Steel slag reaching the required particle size passes through the screen openings on the load-bearing screen 107 into the second space, where it is further crushed by the crushing roller 108 to achieve the final desired particle size. The steel slag meeting the particle size requirements is then conveyed to the subsequent hot-pressing tank device. In other embodiments, multiple load-bearing screens can be provided as needed, each with a different screen opening diameter, enabling multi-stage crushing.

[0052] The screen-type heat exchange surface 103 and the water-cooled wall 110 exchange heat with the steel slag and its flue gas through radiation, convection, and conduction. The water-cooled wall 110 is located on the inner wall of the cylindrical cavity, and the steel slag (heat source) is located in the middle of the cylindrical cavity. When the heat source is located in the center, the radiation angle coefficient of the outer wall of the circle is larger than that of the outer wall of the rectangle. Therefore, the roller crushing device of the present invention can achieve a higher heat exchange rate.

[0053] When the crushing roller 105 presses the steel slag on the load-bearing screen 107, the steel slag at the bottom of the slag pile that is in contact with the load-bearing screen 107 does not directly contact the crushing roller 105 and is not easily crushed. At the same time, this part of the steel slag is also not easily moved. Therefore, the accumulated steel slag quickly clogs the screen holes of the load-bearing screen 107, causing the roller crushing device to malfunction. The spray nozzle in the second space of this invention can promptly spray cooling water onto the lower surface of the load-bearing screen 107 to cool it down. Simultaneously, cooling water is sprayed through the screen holes of the load-bearing screen 107 onto the steel slag on the upper surface of the load-bearing screen 107. The locations where the cooling water is sprayed can directly or indirectly cool the high-temperature steel slag in contact with the load-bearing screen 107 rapidly. During the rapid cooling process, the volume changes caused by the reaction of free calcium oxide and free magnesium oxide with water, as well as the internal crystal transformation of the steel slag, result in greater internal stress in the steel slag. In particular, the surface of the cooled and solidified steel slag cracks rapidly, resulting in smaller steel slag particles that can quickly fall into the second space, thus solving the problem of steel slag clogging at the 107 load-bearing screen.

[0054] The flue gas generated inside the cylindrical cavity is collected by the gas collection hood 102 and discharged through the flue gas discharge channel 101.

[0055] Figures 2 to 6 Five examples of the steel slag treatment system of the present invention are shown. They are described below.

[0056] Figure 2 Examples of steel slag treatment systems shown include, for example: Figure 1 The roller crushing device, power generation device 201, condenser 202, several hot sealing tank devices 203, primary filter 204, secondary filter 205, and steam drum device 207 are shown.

[0057] The hot-sealing tank device 203 is equipped with a hot-sealing steam outlet and a hot-sealing tank water inlet. The steam drum device 207 is equipped with a steam drum steam inlet, a steam drum feedwater inlet, a steam drum steam outlet, and a steam drum water outlet. A hot-sealing steam passage is provided between the hot-sealing steam outlet and the steam drum steam inlet. A return water passage is provided between the steam drum water outlet and the hot-sealing tank water inlet. A header is installed on the return water passage to collect circulating water; this is a conventional technique.

[0058] Figure 2 The power generation device 201 shown is provided with a power generation device fluid inlet and a power generation device fluid outlet. In this embodiment, the power generation device 201 includes... Figure 2 The diagram shows two parts: a steam turbine on the left side, connected to the condenser 202, and a generator on the right side, connected to the steam turbine. The rotation of the steam turbine drives the generator to produce electricity. The steam outlet of the steam drum is connected to the inlet of the screen-type heat exchange surface 103, and the outlet of the screen-type heat exchange surface 103 is connected to the fluid inlet of the power generation device. A regulating valve is also installed on the medium channel between the outlet of the screen-type heat exchange surface 103 and the fluid inlet of the power generation device to adjust the feedwater and steam flow rates, ensuring the stability of the circulation.

[0059] Figure 2 The condenser 202 shown has a condenser inlet and a condenser outlet. The fluid outlet of the power generation unit is connected to the condenser inlet. The condenser outlet is connected to the inlet of the water-cooled wall 110. A circulation pump is provided near the condenser outlet to drive the flow of the fluid medium. The outlet of the water-cooled wall 110 is connected to the steam drum feedwater inlet of the steam drum unit 207. The condenser outlet is also connected to the hot water inlet of the hot water tank through the circulation pump and the header provided on the return water channel.

[0060] Figure 2 The working process of the steel slag treatment system of the present invention shown in the example is as follows:

[0061] The steel slag to be processed enters as follows Figure 1 The roller crusher shown performs the processing as described above. The processed steel slag particles meeting the particle size requirements are conveyed into the hot slag chamber 203. The steel slag is sprayed with water in the hot slag chamber 203 to generate hot slag steam. The hot slag generated in the hot slag chamber 203 is filtered twice by a primary filter 204 and a secondary filter 205 before entering the steam drum 207, where steam-water separation and further purification occur. Waste generated in the steam drum 207 is discharged through the drain outlet 206. The saturated water generated in the steam drum 207 becomes unsaturated water after passing through a header, and this unsaturated water enters the hot slag chamber 203 to participate in spraying the steel slag within the hot slag chamber 203. The saturated steam generated in the steam drum 207 enters the screen-type heat exchange surface 103 through the steam outlet of the steam drum, where it exchanges heat with the steel slag in the roller crusher and becomes superheated steam. The heated superheated steam enters the fluid inlet of the power generation device from the outlet of the screen heat exchange surface 103 to generate electricity. The steam discharged from the fluid outlet of the power generation device enters the condenser 202 for cooling. The resulting saturated water becomes unsaturated water after being circulated by a pump. The unsaturated water is divided into two paths: one path enters the hot slag chamber device 203 to spray the steel slag; the other path enters the water-cooled wall 110, where it undergoes heat exchange and is heated to saturation in the roller crushing device. Then, it enters the steam drum device 207 through the steam drum feedwater inlet.

[0062] The steel slag treatment system of the present invention can make full use of the heat of steel slag in the roller crusher to drive the heat exchange of the steam drum, so that the steam drum can separate clean steam for power generation, and the return water of the steam drum can also be reused, effectively recovering energy and materials, and avoiding the damage of the power generation device to the operation of the steam containing impurities.

[0063] Figure 3 The steel slag treatment system shown includes, for example: Figure 1 The roller crusher shown includes a water-cooled wall 110, a screen-type heat exchange surface 103, several hot-cooled tanks 305, a first heat exchanger 301, a second heat exchanger 304, a primary filter 306, a secondary filter 307, and a steam drum device 309, forming a steam-water circulation subsystem (the first circulation system, the circulation within the first circulation system is the first circulation, hereinafter the same); it also includes a second circulation system consisting of a power generation device 302, a third heat exchanger 303, a second heat exchanger 304, and a first heat exchanger 301 (the circulation within the second circulation system is the second circulation, hereinafter the same).

[0064] The hot-sealing tank device 305 is equipped with a hot-sealing steam outlet and a hot-sealing tank water inlet. The steam drum device 309 is equipped with a steam drum steam inlet, a steam drum feedwater inlet, a steam drum steam outlet, and a steam drum water outlet. A hot-sealing steam passage is provided between the hot-sealing steam outlet and the steam drum steam inlet. A return water passage is provided between the steam drum water outlet and the hot-sealing tank water inlet. A header is installed on the return water passage to collect circulating water; this is a conventional technique.

[0065] The first heat exchanger 301 is provided with a first circulation inlet, a first circulation outlet, a second circulation inlet, and a second circulation outlet. The second heat exchanger 304 is provided with a second circulation inlet, a second circulation outlet, a second circulation inlet, and a second circulation outlet. The first circulation outlet of the first heat exchanger is connected to the first circulation inlet of the second heat exchanger. The first circulation outlet of the second heat exchanger is connected to the inlet of the water-cooled wall 110. The first circulation outlet of the second heat exchanger is connected to the inlet of the hot water tank through a header provided on the return water channel. The first circulation outlet of the second heat exchanger is connected to the inlet of the screen-type heat exchange surface. The outlet of the screen-type heat exchange surface is connected to the steam inlet of the steam drum. The outlet of the water-cooled wall is connected to the steam drum feedwater inlet of the steam drum device 309. The steam drum exhaust outlet of the steam drum device 309 is connected to the first circulation inlet of the first heat exchanger.

[0066] Figure 3 The example shown includes a steam-water circulation system (first circulation) between the steam drum unit, the roller crushing unit, and the hot sealing tank, and also adds a second circulation system. The second circulation system includes a first heat exchanger 301, a power generation unit 302, a third heat exchanger 303, and a second heat exchanger 304.

[0067] The power generation device 302 is provided with a fluid inlet and a fluid outlet. In this embodiment, the power generation device 302 includes an expander and a generator connected to it (power generation device 302 on the right side of the figure), and the expander drives the generator to generate electricity. Expanders are typically used in organic Rankine cycles with organic working fluid as the flowing medium. The second circulation system in this embodiment is an organic Rankine cycle. The third heat exchanger 303 is provided with a third heat exchanger inlet and a third heat exchanger outlet. The fluid outlet of the power generation device is connected to the third heat exchanger inlet. The third heat exchanger outlet is connected to the second circulation inlet of the second heat exchanger. A circulation pump is provided between the third heat exchanger outlet and the second circulation inlet of the second heat exchanger to drive the flow of the fluid medium. The third heat exchanger 303 acts as a condenser for the medium in the second circulation and can also be called a condenser. The second circulation outlet of the second heat exchanger is connected to the second circulation inlet of the first heat exchanger. The second circulation outlet of the first heat exchanger is connected to the fluid inlet of the power generation device. In this embodiment, the medium circulating in the second circulation subsystem is R123 (trifluorodichloroethane). In other embodiments, R134a (tetrafluoroethane) may also be used.

[0068] Figure 3 The working process of the steel slag treatment system of the present invention shown in the example is as follows:

[0069] The steel slag to be processed enters as follows Figure 1The roller crushing device shown performs the processing as described above. The processed steel slag particles meeting the particle size requirements are conveyed into the hot slag cascading device 305. The steel slag is sprayed with water in the hot slag cascading device 305 to generate hot slag steam. The hot slag steam generated in the hot slag cascading device 305 is filtered twice by a primary filter 306 and a secondary filter 307 before entering the steam drum device 309, where steam-water separation and purification are performed. Waste generated in the steam drum device 309 is discharged through the drain port 308. The saturated water generated in the steam drum device 309 enters the header through the return water channel, and the unsaturated water output from the header enters the hot slag cascading device 305 to spray the steel slag within. The saturated steam generated in the steam drum device 309 enters the first circulation inlet of the first heat exchanger through the steam outlet of the steam drum. At the first heat exchanger, the saturated steam of the first circulation exchanges heat with the medium of the second circulation, and the saturated steam of the first circulation is cooled to form unsaturated water. Unsaturated water continues to enter the second heat exchanger and exchange heat with the medium in the second circulation for cooling. The generated unsaturated water is divided into three paths: one path enters the header and then enters the hot slag spraying device 305; the second path enters the water-cooled wall 110, where it exchanges heat and heats up in the roller crushing device to form saturated water, and then enters the steam drum device 309 through the steam drum feedwater inlet; the third path enters the screen-type heat exchange surface 103, where it exchanges heat and heats up in the roller crushing device to form steam, and then enters the steam drum device 309 through the steam drum steam inlet.

[0070] In the second cycle, the medium flowing out of the power generation unit 302 is in a superheated gaseous state and enters the third heat exchanger 303 for cooling. A saturated liquid medium is output from the third heat exchanger 303. This saturated liquid medium is then pumped through a circulating pump to become an unsaturated liquid medium, which then enters the second heat exchanger 304 for a first heating to form a saturated gaseous medium (in the second cycle system, the second heat exchanger 304 acts as an evaporator). The saturated gaseous medium then enters the first heat exchanger 301 for a second heating to form a superheated gaseous medium. The superheated gaseous medium after the second heating enters the power generation unit 302 to generate electricity.

[0071] Figure 4 Examples of the steel slag treatment system of the present invention shown include, for example: Figure 1 The roller crusher shown includes a water-cooled wall 110, several hot-cooled tanks 405, a first heat exchanger 401, a second heat exchanger 404, a primary filter 406, a secondary filter 407, and a steam drum device 409, forming a steam-water circulation subsystem (first circulation system); it also includes a second circulation system consisting of a screen-type heat exchange surface 103, a power generation device 402, a third heat exchanger 403, a second heat exchanger 404, and a first heat exchanger 401.

[0072] exist Figure 4In the hot-sealing tank device 405, a hot-sealing steam outlet and a hot-sealing tank water inlet are provided. The steam drum device 409 is provided with a steam drum steam inlet, a steam drum feedwater inlet, a steam drum steam outlet, and a steam drum water outlet. A hot-sealing steam passage is provided between the hot-sealing steam outlet and the steam drum steam inlet. A return water passage is provided between the steam drum water outlet and the hot-sealing tank water inlet. A header is provided on the return water passage for collecting circulating water; this is conventional technology.

[0073] The first heat exchanger 401 is provided with a first circulation inlet, a first circulation outlet, a second circulation inlet, and a second circulation outlet. The second heat exchanger 404 is provided with a second circulation inlet, a second circulation outlet, a second circulation inlet, and a second circulation outlet. The first circulation outlet of the first heat exchanger is connected to the first circulation inlet of the second heat exchanger. The first circulation outlet of the second heat exchanger is connected to the inlet of the water-cooled wall 110. The first circulation outlet of the second heat exchanger is connected to the inlet of the hot water tank through a header provided on the return water channel. The outlet of the water-cooled wall is connected to the steam drum feedwater inlet of the steam drum device 409. The steam drum steam outlet of the steam drum device 409 is connected to the first circulation inlet of the first heat exchanger.

[0074] The power generation device 402 is provided with a fluid inlet and a fluid outlet. In this embodiment, the power generation device 402 includes an expander and a generator connected to it (power generation device 402 on the right side of the figure). The expander drives the generator to generate electricity. Expanders are typically used in organic Rankine cycles with organic working fluid as the flowing medium. The second circulation system in this embodiment is an organic Rankine cycle. The third heat exchanger 403 is provided with a third heat exchanger inlet and a third heat exchanger outlet. The fluid outlet of the power generation device is connected to the third heat exchanger inlet. The third heat exchanger outlet is connected to the second circulation inlet of the second heat exchanger. A circulation pump is provided between the third heat exchanger outlet and the second circulation inlet of the second heat exchanger to drive the flow of the fluid medium. The third heat exchanger 403 acts as a condenser for the medium in the second circulation and can also be called a condenser. The second circulation outlet of the second heat exchanger is connected to the second circulation inlet of the first heat exchanger. The second circulation outlet of the first heat exchanger is connected to the inlet of the screen-type heat exchange surface. The outlet of the screen-type heat exchange surface is connected to the fluid inlet of the power generation device.

[0075] Figure 4 The working process of the steel slag treatment system of the present invention shown in the example is as follows:

[0076] The steel slag to be processed enters as follows Figure 1The roller crushing device shown performs the processing as described above. The processed steel slag particles meeting the particle size requirements are conveyed into the hot slag condenser 405. The steel slag is sprayed with water in the hot slag condenser 405 to generate hot slag steam. The hot slag steam generated in the hot slag condenser 405 is filtered twice by a primary filter 406 and a secondary filter 407 before entering the steam drum device 409, where steam-water separation and purification take place. Waste generated in the steam drum device 409 is discharged through the drain port 408. Saturated water generated in the steam drum device 409 enters the header through the return water channel, and unsaturated water output from the header enters the hot slag condenser 405 to spray the steel slag within. Saturated steam generated in the steam drum device 409 enters the first circulation inlet of the first heat exchanger through the steam outlet of the steam drum. At the first heat exchanger, the saturated steam of the first circulation exchanges heat with the medium of the second circulation, and the saturated steam of the first circulation is cooled to form unsaturated water. Unsaturated water continues to enter the second heat exchanger and exchange heat with the medium in the second circulation to cool down. The resulting unsaturated water is divided into two paths: one path enters the hot slag chamber device 405 to spray the steel slag; the other path enters the water-cooled wall 110, where it exchanges heat and heats up in the roller crushing device to form saturated water, and then enters the steam drum device 409 through the steam drum feedwater inlet.

[0077] In the second cycle, the superheated gaseous medium flowing out of the power generation unit 402 enters the third heat exchanger 403 for cooling to form a saturated liquid medium. After passing through a circulating pump, the saturated liquid medium becomes an unsaturated liquid medium, which then enters the second heat exchanger 404 for a first heating to form a saturated gaseous medium (in the second cycle, the second heat exchanger 404 acts as an evaporator). The saturated gaseous medium then enters the first heat exchanger 401 for a second heating to form a superheated gaseous medium, and finally enters the screen-type heat exchange surface 103 for a third heating to form a superheated gaseous medium. The superheated gaseous medium after three heating cycles then enters the power generation unit 302 to generate electricity.

[0078] exist Figure 5 Examples of the steel slag treatment system of the present invention shown include, for example: Figure 1 The illustrated components include a roller crusher 505, a power generation unit 505, a condenser 506, several hot-cooling tanks 507, a primary filter 508, a secondary filter 509, and a segmented steam drum device 510. The segmented steam drum device 510 comprises two separated sections: a salt section 501 and a clean section 504. A salt section steam-water separator 502 is installed in the salt section 501; a clean section steam-water separator 503 is installed in the clean section 504. The segmented steam drum device is existing technology, such as the steam drum disclosed in Chinese Patent No. 201010536948.0, entitled "Natural Circulation Steam Injection Boiler and Water Circulation Method Using High-Salinity Softened Water as Feedwater."

[0079] The hot-sealing tank device 507 is equipped with a hot-sealing steam outlet and a hot-sealing tank water inlet. The segmented steam drum device 510 is equipped with a steam drum inlet, a steam drum feedwater inlet, a steam drum outlet, and a steam drum water outlet. A hot-sealing steam channel is provided between the hot-sealing steam outlet and the steam drum inlet. A return water channel is provided between the steam drum water outlet and the hot-sealing tank water inlet. A header is provided on the return water channel for collecting circulating water, which is conventional technology. The steam drum inlet is located at the inlet of the clean section steam-water separator 503. The steam drum outlets include a clean section steam drum outlet located in the clean section and a salt section steam drum outlet located in the salt section. The steam drum water outlets include a clean section steam drum water outlet located in the clean section and a salt section steam drum water outlet located in the salt section. The clean section steam drum water outlet is connected to the hot-sealing tank water inlet. The salt section steam drum water outlet is connected to the water-cooled wall inlet. The outlet of the water-cooled wall is connected to the inlet of the steam-water separator 502 in the salt section. The steam drum feedwater inlet is located on the clean section 504.

[0080] The power generation device 505 is provided with a power generation device fluid inlet and a power generation device fluid outlet. In this embodiment, the power generation device 505 includes... Figure 5 The diagram shows two parts: a steam turbine on the left side, connected to the condenser 506, and a generator on the right side, connected to the steam turbine. The rotation of the steam turbine drives the generator to generate electricity. The steam outlet of the steam drum is connected to the fluid inlet of the power generation unit; that is, both the steam outlet of the clean section steam drum and the steam outlet of the salt section steam drum are connected to the fluid inlet of the power generation unit. A regulating valve is also provided on the medium channel between the steam outlet of the steam drum and the fluid inlet of the power generation unit to regulate the feedwater and steam flow rates, ensuring the stability of the circulation. The outlet of the screen-type heat exchange surface is connected to the fluid inlet of the power generation unit. The condenser 506 is provided with a condenser inlet and a condenser outlet. The fluid outlet of the power generation unit is connected to the condenser inlet. The condenser outlet is connected to the steam drum feedwater inlet. A circulating pump is provided between the condenser outlet and the steam drum feedwater inlet to drive the flow of the fluid medium. The condenser outlet is connected to the hot water inlet of the hot water tank through a header provided on the return water channel.

[0081] Figure 5 The working process of the steel slag treatment system of the present invention shown in the example is as follows:

[0082] The steel slag to be processed enters as follows Figure 1The roller crushing device shown performs the processing as described above. After processing, the steel slag particles meeting the particle size requirements are conveyed into the hot slag annealing device 507. The steel slag is sprayed with water in the hot slag annealing device 507 to generate hot annealing steam. The hot annealing steam generated in the hot annealing device 507 is filtered twice by a primary filter 508 and a secondary filter 509 before entering the segmented steam drum device 510 through the steam inlet of the steam drum. The segmented steam drum device 510 processes the steam through a clean section 504 and a salt section 501 in sequence, completing steam-water separation and purification. Specifically, the saturated water discharged from the steam drum water outlet of the salt section is heated by the water-cooled wall 110 to form steam, which enters the steam-water separator 502 in the salt section for further steam-water separation. Waste generated in the salt section 501 is discharged through the drain outlet located in the salt section 501. Water discharged from the clean section steam drum water outlet passes through a header to form unsaturated water, which enters the hot annealing device 507 to participate in the spraying of the steel slag. The saturated steam discharged from the steam outlet of the clean section steam drum is heated by the screen-type heat exchange surface 103 to form superheated steam, which flows to the fluid inlet of the power generation device. The saturated steam discharged from the steam outlet of the salt section steam drum and the superheated steam output from the screen-type heat exchange surface 103 are mixed to form superheated steam, which enters the fluid inlet of the power generation device to supply the power generation device 505 for power generation. The steam discharged from the fluid outlet of the power generation device enters the condenser 506 for cooling, and the resulting saturated water is divided into two paths: one path goes through the circulation pump and the header to form unsaturated water, which enters the hot slag spraying device 507; the other path goes through the circulation pump to form unsaturated water, which then enters the segmented steam drum device 510 through the steam drum feedwater inlet.

[0083] Figure 6 Examples of the steel slag treatment system of the present invention shown include, for example: Figure 1 The system shown comprises a steam-water circulation subsystem (first circulation system) consisting of a roller crushing device, several hot sump tanks 609, a first heat exchanger 605, a second heat exchanger 608, a primary filter 610, a secondary filter 611, and a segmented steam drum device 612; it also includes a second circulation system consisting of a power generation device 606, a third heat exchanger 607, a second heat exchanger 608, and a first heat exchanger 605.

[0084] The segmented steam drum device 612 includes two separate parts: a salt section 601 and a clean section 604. A salt section steam-water separator 602 is installed in the salt section 601; a clean section steam-water separator 603 is installed in the clean section 604.

[0085] The hot-sealing tank device 609 is equipped with a hot-sealing steam outlet and a hot-sealing tank water inlet. The segmented steam drum device 612 is equipped with a steam drum inlet, a steam drum feedwater inlet, a steam drum outlet, and a steam drum water outlet. A hot-sealing steam channel is provided between the hot-sealing steam outlet and the steam drum inlet. A return water channel is provided between the steam drum water outlet and the hot-sealing tank water inlet. A header is provided on the return water channel for collecting circulating water, which is a conventional technology. The steam drum inlet is located at the inlet of the clean section steam-water separator 603. The steam drum outlets include a clean section steam drum outlet located in the clean section and a salt section steam drum outlet located in the salt section. The steam drum water outlets include a clean section steam drum water outlet located in the clean section and a salt section steam drum water outlet located in the salt section. The clean section steam drum water outlet is connected to the hot-sealing tank water inlet. The salt section steam drum water outlet is connected to the water-cooled wall inlet. The outlet of the water-cooled wall is connected to the inlet of the steam-water separator 602 in the salt section. The steam drum feedwater inlet is located on the clean section 604.

[0086] The first heat exchanger 605 is provided with a first circulation inlet, a first circulation outlet, a second circulation inlet, and a second circulation outlet. The second heat exchanger 608 is provided with a second circulation inlet, a second circulation outlet, a second circulation inlet, and a second circulation outlet. The first circulation outlet of the first heat exchanger is connected to the first circulation inlet of the second heat exchanger. The first circulation outlet of the second heat exchanger is connected to the steam drum feedwater inlet. The first circulation outlet of the second heat exchanger is connected to the hot water inlet of the hot water tank through a header provided on the return water channel. The steam outlet of the salt section steam drum is connected to the first circulation inlet of the first heat exchanger. The steam outlet of the clean section steam drum is connected to the inlet of the screen-type heat exchange surface; the outlet of the screen-type heat exchange surface is connected to the first circulation inlet of the first heat exchanger.

[0087] The power generation device 606 is provided with a fluid inlet and a fluid outlet. In this embodiment, the power generation device 606 includes an expander and a generator connected to it (power generation device 606 on the right side of the figure). The expander drives the generator to generate electricity. Expanders are typically used in organic Rankine cycles with organic working fluid as the flowing medium. The second cycle in this embodiment is an organic Rankine cycle. The third heat exchanger 607 is provided with a third heat exchanger inlet and a third heat exchanger outlet. The fluid outlet of the power generation device is connected to the third heat exchanger inlet. The third heat exchanger outlet is connected to the second circulation inlet of the second heat exchanger. A circulation pump is provided between the third heat exchanger outlet and the second circulation inlet of the second heat exchanger to drive the flow of the fluid medium. The third heat exchanger 607 acts as a condenser for the medium in the second cycle and can also be called a condenser. The second circulation outlet of the second heat exchanger is connected to the second circulation inlet of the first heat exchanger. The second circulation outlet of the first heat exchanger is connected to the fluid inlet of the power generation device.

[0088] Figure 6 The working process of the steel slag treatment system of the present invention shown in the example is as follows:

[0089] The steel slag to be processed enters as follows Figure 1 The roller crushing device shown performs the processing as described above. After processing, the steel slag particles meeting the particle size requirements are conveyed into the hot slag annealing device 609. The steel slag is sprayed with water in the hot slag annealing device 609 to generate hot annealing steam. The hot annealing steam generated in the hot annealing device 609 is filtered twice by a primary filter 610 and a secondary filter 611, and then enters the segmented steam drum device 612 through the steam inlet of the steam drum. The segmented steam drum device 612 processes the slag through a clean section 604 and a salt section 601 in sequence, completing steam-water separation and purification. Specifically, the saturated water discharged from the steam drum water outlet of the salt section is heated by the water-cooled wall 110 to form steam, which enters the salt section steam-water separator 602 for further steam-water separation. Waste generated in the salt section 601 is discharged through the drain outlet located in the salt section 601. Water discharged from the clean section steam drum water outlet enters a header, and unsaturated water discharged from the header enters the hot annealing device 609 to participate in the spraying of the steel slag.

[0090] The saturated steam discharged from the steam outlet of the clean section steam drum is heated by the screen-type heat exchange surface 103 to form superheated steam. The saturated steam discharged from the steam outlet of the salt section steam drum mixes with the superheated steam output from the screen-type heat exchange surface 103 to form superheated steam, which enters the first circulation inlet of the first heat exchanger. At the first heat exchanger, the superheated steam of the first circulation exchanges heat with the medium of the second circulation, and the superheated steam of the first circulation is cooled into saturated steam. The cooled saturated steam continues to enter the second heat exchanger to exchange heat with the medium of the second circulation and cool down. The unsaturated water generated is divided into two paths: one path enters the header and then enters the hot slag spraying device 609; the second path enters the segmented steam drum device 612 through the steam drum feedwater inlet.

[0091] In the second cycle, the superheated gaseous medium flowing out of the power generation unit 606 enters the third heat exchanger 607 for cooling. The resulting saturated liquid medium is then pumped by a circulating pump to become an unsaturated liquid medium. This unsaturated liquid medium enters the second heat exchanger 608 for a first heating to form a saturated gaseous medium (in the second cycle, the second heat exchanger 608 acts as an evaporator). The saturated gaseous medium then enters the first heat exchanger 605 for a second heating. The superheated gaseous medium formed after the second heating enters the power generation unit 606 to generate electricity.

[0092] It is worth noting that the above description is only a preferred embodiment of the present invention and does not limit the scope of patent protection of the present invention. The present invention can also be replaced by equivalent technologies. Therefore, all equivalent changes made based on the description and figures of the present invention, or direct or indirect applications to other related technical fields, are included within the scope of the present invention.

Claims

1. A steel slag treatment system, comprising a hot quenching tank device and a roller crushing device, wherein the hot quenching tank device is provided with a hot quenching steam outlet, characterized in that: It also includes a steam drum device, which is provided with a steam drum steam inlet, a steam drum water inlet, a steam drum steam outlet, and a steam drum water outlet. A hot simmering steam channel is provided between the hot simmering steam outlet and the steam drum steam inlet. A hot simmering tank inlet is provided on the hot simmering tank device, and a return water channel is provided between the steam drum water outlet and the hot simmering tank water inlet. The roller crushing device includes a cylindrical cavity; the sidewall of the cylindrical cavity is parallel to the direction of gravity; a load-bearing screen is provided inside the cylindrical cavity; the load-bearing screen divides the cylindrical cavity into two spaces in the direction of gravity: a first space above the direction of gravity and a second space below the direction of gravity; a screen-type heat exchange surface and a crushing roller are provided in the first space; A water-cooled wall is provided on the side wall of the cylindrical cavity; a water-cooled wall inlet is provided below the gravity direction of the water-cooled wall; a water-cooled wall outlet is provided above the gravity direction of the water-cooled wall; and a screen-type heat exchange surface outlet and a screen-type heat exchange surface inlet are provided on the screen-type heat exchange surface.

2. The steel slag treatment system according to claim 1, characterized in that: The crushing roller is shaped like a frustum; the smaller end of the crushing roller is located near the central axis of the cylindrical cavity; the larger end of the crushing roller is located near the water-cooled wall; the crushing roller is capable of rotating about the central axis of the cylindrical cavity as the center of rotation and about the generatrix of the frustum shape as the radius of rotation.

3. The steel slag treatment system according to claim 2, characterized in that: A liquid spray nozzle is provided in the second space, which faces the load-bearing screen.

4. The steel slag treatment system according to claim 3, characterized in that: The liquid injection port is provided on the central axis of the cylindrical cavity; and / or the liquid injection port is provided on the side wall of the cylindrical cavity.

5. The steel slag treatment system according to claim 1, characterized in that: It includes a power generation device, which is provided with a power generation device fluid inlet and a power generation device fluid outlet; the steam exhaust outlet of the steam drum is connected to the power generation device fluid inlet.

6. The steel slag treatment system according to claim 5, characterized in that: The steam outlet of the steam drum is connected to the inlet of the screen-type heat exchange surface; the outlet of the screen-type heat exchange surface is connected to the fluid inlet of the power generation device.

7. The steel slag treatment system according to claim 5, characterized in that: It also includes a condenser, which has a condenser inlet and a condenser outlet; the fluid outlet of the power generation unit is connected to the condenser inlet; the condenser outlet is connected to the water-cooled wall inlet; and the water-cooled wall outlet is connected to the steam drum feedwater inlet.

8. The steel slag treatment system according to claim 7, characterized in that: The condenser outlet is connected to the water inlet of the hot-cooled tank.

9. The steel slag treatment system according to claim 1, characterized in that: It includes a first heat exchanger and a second heat exchanger; the first heat exchanger is provided with a first circulation inlet, a first circulation outlet, a first circulation inlet, and a second circulation outlet; the second heat exchanger is provided with a second circulation inlet, a second circulation outlet, a second circulation inlet, and a second circulation outlet; the first circulation outlet of the first heat exchanger is connected to the first circulation inlet of the second heat exchanger; the first circulation outlet of the second heat exchanger is connected to the water-cooled wall inlet; the first circulation outlet of the second heat exchanger is connected to the hot water inlet of the hot water tank; the water-cooled wall outlet is connected to the steam drum feedwater inlet; and the steam drum steam outlet is connected to the first circulation inlet of the first heat exchanger.

10. The steel slag treatment system according to claim 9, characterized in that: The device includes a power generation unit with a power generation unit fluid inlet and a power generation unit fluid outlet; it also includes a third heat exchanger with a third heat exchanger inlet and a third heat exchanger outlet; the power generation unit fluid outlet is connected to the third heat exchanger inlet; the third heat exchanger outlet is connected to the second circulation inlet of the second heat exchanger; the second circulation outlet of the second heat exchanger is connected to the second circulation inlet of the first heat exchanger; the second circulation outlet of the first heat exchanger is connected to the inlet of the screen-type heat exchange surface; and the screen-type heat exchange surface outlet is connected to the power generation unit fluid inlet.

11. The steel slag treatment system according to claim 9, characterized in that: The first circulation outlet of the second heat exchanger is connected to the inlet of the screen-type heat exchange surface; the outlet of the screen-type heat exchange surface is connected to the steam inlet of the steam drum.

12. The steel slag treatment system according to claim 11, characterized in that: The device includes a power generation unit, which has a power generation unit fluid inlet and a power generation unit fluid outlet; it also includes a third heat exchanger, which has a third heat exchanger inlet and a third heat exchanger outlet; the power generation unit fluid outlet is connected to the third heat exchanger inlet; the third heat exchanger outlet is connected to the second circulation inlet of the second heat exchanger; the second circulation outlet of the second heat exchanger is connected to the second circulation inlet of the first heat exchanger; and the second circulation outlet of the first heat exchanger is connected to the power generation unit fluid inlet.

13. The steel slag treatment system according to claim 1, characterized in that: The steam drum device includes a segmented steam drum, which comprises a salt section and a clean section. The steam inlet of the steam drum is located at the inlet of the clean section steam-water separator within the clean section. The steam outlet of the steam drum includes a clean section steam drum outlet located in the clean section and a salt section steam drum outlet located in the salt section. The water outlet of the steam drum includes a clean section steam drum water outlet located in the clean section and a salt section steam drum water outlet located in the salt section. The clean section steam drum water outlet is connected to the water inlet of the hot sump tank. The salt section steam drum water outlet is connected to the inlet of the water-cooled wall. The water-cooled wall outlet is connected to the inlet of the salt section steam-water separator located within the salt section.

14. The steel slag treatment system according to claim 13, characterized in that: It includes a power generation device, which is provided with a power generation device fluid inlet and a power generation device fluid outlet; the steam exhaust outlet of the steam drum is connected to the power generation device fluid inlet.

15. The steel slag treatment system according to claim 14, characterized in that: The steam outlet of the salt section steam drum is connected to the fluid inlet of the power generation device; the steam outlet of the clean section steam drum is connected to the inlet of the screen-type heat exchange surface; and the outlet of the screen-type heat exchange surface is connected to the fluid inlet of the power generation device.

16. The steel slag treatment system according to claim 14, characterized in that: It also includes a condenser, which has a condenser inlet and a condenser outlet; the fluid outlet of the power generation unit is connected to the condenser inlet; the condenser outlet is connected to the steam drum feedwater inlet; the steam drum feedwater inlet is located on the clean section.

17. A steel slag treatment system according to claim 16, characterized in that: The condenser outlet is connected to the water inlet of the hot-cooled tank.

18. The steel slag treatment system according to claim 13, characterized in that: It includes a first heat exchanger and a second heat exchanger; the first heat exchanger is provided with a first circulation inlet, a first circulation outlet, a first circulation inlet, and a second circulation outlet; the second heat exchanger is provided with a second circulation inlet, a second circulation outlet, a second circulation inlet, and a second circulation outlet; the first circulation outlet of the first heat exchanger is connected to the first circulation inlet of the second heat exchanger; the first circulation outlet of the second heat exchanger is connected to the steam drum feedwater inlet; the first circulation outlet of the second heat exchanger is connected to the hot water inlet of the hot chamber; the steam exhaust outlet of the steam drum is connected to the first circulation inlet of the first heat exchanger.

19. A steel slag treatment system according to claim 18, characterized in that: The steam outlet of the clean section steam drum is connected to the inlet of the screen-type heat exchange surface; the outlet of the screen-type heat exchange surface is connected to the first circulation inlet of the first heat exchanger.

20. A steel slag treatment system according to claim 18, characterized in that: The device includes a power generation unit, which has a power generation unit fluid inlet and a power generation unit fluid outlet; it also includes a third heat exchanger, which has a third heat exchanger inlet and a third heat exchanger outlet; the power generation unit fluid outlet is connected to the third heat exchanger inlet; the third heat exchanger outlet is connected to the second circulation inlet of the second heat exchanger; the second circulation outlet of the second heat exchanger is connected to the second circulation inlet of the first heat exchanger; and the second circulation outlet of the first heat exchanger is connected to the power generation unit fluid inlet.

21. The steel slag treatment system according to claim 1, characterized in that: A filter is installed in the hot steam passage.

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