CN214142412U

CN214142412U - Slag waste heat recovery system

Info

Publication number: CN214142412U
Application number: CN202023121861.5U
Authority: CN
Inventors: 王建康
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-12-22
Filing date: 2020-12-22
Publication date: 2021-09-07
Anticipated expiration: 2030-12-22

Abstract

The utility model provides a slag waste heat recovery system relates to metallurgical waste heat recovery technical field. The slag waste heat recovery system comprises a granulating tower, the granulating tower comprises a rotating shaft, a framework and an acting plate, the framework is fastened on the rotating shaft, the acting plate is conical, the acting plate is covered on the framework, the large-end opening of the acting plate faces the rotating shaft, the acting plate and the framework can do rotary motion along with the rotating shaft, and then slag liquid on the top surface of the acting plate is thrown out and cooled to be converted into slag particles. The utility model discloses a slag waste heat recovery system, granulation tower turn into the conversion rate height of slag grain with the slag liquid, and the granulation tower can use in the thermal heat recovery stove of slag grain is retrieved to the air quenching method, not only does not have the water waste, and is little to the pollution of environment, retrieves the thermal efficient of slag grain moreover.

Description

Slag waste heat recovery system

Technical Field

The utility model relates to a metallurgical waste heat recovery technical field especially relates to a slag waste heat recovery system.

Background

The steel industry is a supporting industry of national economy, the yield is large, and correspondingly, the quantity of slag discharged by a submerged arc furnace and a blast furnace is also large, for example, in 2019, the pig iron yield of China is 8.09 hundred million tons, wherein the annual production of blast furnace slag reaches 2.8316 hundred million tons, the tapping temperature of the submerged arc furnace slag and the blast furnace slag is 1400-1550 ℃, and the enthalpy heat is about 1797kJ/kg, so that the heat in the submerged arc furnace slag and the blast furnace slag needs to be effectively utilized.

In order to utilize the heat in the submerged arc furnace slag and the blast furnace slag, the heat in the submerged arc furnace slag and the blast furnace slag is generally recovered and utilized by a water quenching method, and common water quenching methods are, for example, the INBA method (abba), the tyana method (TYNA), the bottom filtration method (OPC), the rasa method (RA-SA), and the minte method. The heat in the slag is recovered by a water quenching method, the slag is firstly washed by low-temperature water to obtain high-temperature hot water, and then the heat in the high-temperature hot water is recovered to hot water for life or hot water for heating by a heat recovery furnace.

However, the water quenching process not only wastes water resources, but also produces SO₂、H₂S gas, which pollutes the environment.

SUMMERY OF THE UTILITY MODEL

In view of the above problem, the utility model provides a slag waste heat recovery system for solve the problem of water quenching method water waste resource, polluted environment.

In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:

the embodiment of the utility model provides a slag waste heat recovery system, which comprises a granulation tower; the granulation tower comprises a rotating shaft, a framework and an acting plate; the framework is fastened on the rotating shaft; the action plate is conical, the action plate is covered on the framework, the large end opening of the action plate faces the rotating shaft, the action plate and the framework can do rotating motion along with the rotating shaft, and then slag liquid on the top surface of the action plate is thrown out and cooled to be converted into slag particles.

The utility model discloses an among the slag waste heat recovery system, rotary motion is done to the revolving axle, drive and revolving axle fixed connection's skeleton rotation, and then drive the effect board of connecting on the skeleton and rotate, when the slag liquid falls on the top surface of effect board, the temperature of slag liquid can reduce fast, the slag liquid just can turn into the sediment grain, the sediment grain of conversion can adopt the air quenching method to carry out heat recovery in the heat recovery stove, not only do not have the water waste, little to the pollution of environment, it is efficient to retrieve the slag heat moreover.

In some embodiments, the action plate comprises a plurality of first grooves with notches facing the framework and a plurality of second grooves with notches facing away from the framework, the first grooves and the second grooves are arranged at intervals to form corrugations, and the groove length direction of the first grooves and the second grooves is the radial direction of the action plate.

In some embodiments, the conical apex position of the action plate is provided with a first through hole for the cooling wind to blow through.

In some embodiments, the conical surface of the acting plate is provided with a second through hole which is offset from the framework and is used for cooling air to blow through.

In some embodiments, the skeleton comprises a plurality of ribs fastened to form a frame in a shape of a Chinese character 'mi'.

In some embodiments, each rib is provided with a reinforcing rib, and the reinforcing ribs are arranged in the shape of fan blades.

In some embodiments, a plurality of ribs are fastened to form a multi-layered, mitre-shaped frame.

In some embodiments, the granulation tower further comprises a reflective plate disposed radially outside the action plate, the reflective plate making the particles of the slag particles thrown onto the action plate smaller and serving to change the moving direction of the slag particles.

In some embodiments, the system further comprises a heat exchanger, a waste heat recovery boiler, a first cold air channel, a second cold air channel, and a hot air channel; the heat exchanger comprises a shell, wherein the upper half part of the shell is provided with a granulating chamber, a granulating tower is arranged in the granulating chamber, the lower half part of the shell is provided with a heat exchange cavity, the heat exchange cavity is used for collecting slag particles and exchanging heat, the bottom of the shell is also provided with a cold air port, and the side part of the shell is also provided with a hot air port; the waste heat recovery boiler comprises a cold air outlet and a hot air inlet, the cold air outlet is communicated with one end of a first cold air channel and one end of a second cold air channel, the first cold air channel penetrates through the shell and blows cold air to the bottom surface of the acting plate so that slag liquid on the top surface of the acting plate is cooled and converted into slag particles, and the other end of the second cold air channel is communicated with a cold air port; the hot air inlet is communicated with one end of the hot air channel, and the other end of the hot air channel is communicated with the hot air port.

In some embodiments, the system further comprises a steam turbine, a generator and a steam channel, wherein one end of the steam channel is communicated with a steam outlet arranged on the waste heat recovery boiler, the other end of the steam channel is communicated with the steam turbine, and the steam turbine is in transmission connection with the generator.

In some embodiments, insulating bricks are built into the shell opposite the inner side walls of the shell.

In some embodiments, the inner lower half of the insulating brick is constructed with wear resistant steel bricks and the inner upper half of the insulating brick is constructed with refractory bricks.

In some embodiments, perlite and rock wool are filled between the insulating brick and the shell.

In some embodiments, the heat exchanger further comprises a flow guide plate fastened on the shell, the flow guide plate is funnel-shaped, a small end opening of the flow guide plate is arranged right above the cold air port, and a large end opening of the flow guide plate is arranged opposite to the granulating chamber.

In some embodiments, the inner surface of the deflector is provided with a plurality of baffles.

In some embodiments, a cooling chamber is arranged inside the guide plate, a cold water inlet pipe and a hot water outlet pipe which are communicated with the cooling chamber are arranged on the guide plate, and the cold water inlet pipe extends into the small-end opening of the guide plate.

In some embodiments, an infrared thermal imager is disposed on a side wall of the housing for observing the distribution of the slag particles in the housing.

In some embodiments, the side wall of the housing is further provided with a thermocouple for detecting the temperature of the hot air blown out from the hot air port.

In addition to the technical problems, technical features constituting technical solutions, and advantageous effects brought by the technical features of the technical solutions described above, other technical problems that can be solved by the slag waste heat recovery system provided by the present invention, other technical features included in the technical solutions, and advantageous effects brought by the technical features will be described in further detail in the following detailed description.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a slag waste heat recovery system according to the present embodiment;

FIG. 2a is a first sectional view showing a partial structure of a granulation tower in the present embodiment;

FIG. 2b is a second sectional view showing a partial structure of the granulation tower in the present embodiment;

FIG. 3a is a first cross-sectional view of the homogenizer in this embodiment;

FIG. 3b is a sectional view of the homogenizer in this embodiment;

FIG. 4 is a cross-sectional view of a baffle in this embodiment;

fig. 5 is a sectional view showing a part of the structure of the conical breaking in this embodiment.

Description of reference numerals:

100: a heat recovery furnace; 101: a housing;

102: a granulation chamber; 103: a heat exchange cavity;

104: a cold air port; 105: a hot air port;

106: a baffle; 107: a striker plate;

108: a cooling chamber; 109: a cold water inlet pipe;

110: a hot water outlet pipe; 111: an infrared thermal imager;

112: a first thermocouple; 200: a granulation tower;

201: a rotating shaft; 202: a framework;

203: an action plate; 204: a first motor;

205: a first through hole; 206: a second through hole;

207: ribs; 208: a reflective plate;

209: a second thermocouple; 300: a waste heat recovery boiler;

301: a first cold air passage; 302: a second cold air passage;

303: a hot air passage; 304: a main air outlet channel;

305: a cold air outlet; 306: a hot air inlet;

307: a first air outlet section; 308: a second air outlet section;

309: a third air outlet section; 310: a first flow regulating valve;

311: a flow meter; 312: a second flow regulating valve;

313: a pressure gauge; 314: a steam channel;

315: a steam outlet; 316: a first subsection;

317: a second sub-segment; 318: a first total section;

319: a second total section; 400: a fan;

500: a dumping device; 600: a slag pot;

700: buffering the packet; 701: a throttle nozzle;

800: a homogenizer; 801: lifting lugs;

802: an overflow trough; 900: conical breaking;

901: a drive shaft; 902: a supporting seat;

903: a conical movable jaw; 904: a hood;

905: a wind hole; 906: a first level indicator;

907: a second level gauge; 908: a wind blocking material flow valve;

a00: a conveyor; b00: a steam turbine;

c00: a generator; d00: a gravity dust collector;

e00: a bag-type dust collector.

Detailed Description

In the prior art, the heat in the slag is recovered by a water quenching method, the slag is firstly washed by low-temperature water to obtain high-temperature hot water, and then the heat in the high-temperature hot water is recovered to hot water for life or hot water for heating by a heat recovery furnace.

However, the water quenching process not only wastes water resources, but also produces SO₂、H₂S gas, which pollutes the environment. Therefore, the utility model provides a slag waste heat recovery system, it includes granulation tower, waste heat recovery boiler, heat recovery stove, and the granulation tower turns into the slag grain with the cooling of slag liquid, and the back in the slag grain gets into the heat recovery stove, adopts the heat of the slag grain in the heat recovery stove of air quenching method recovery, and the hot-air that produces in the heat recovery stove enters into the waste heat recovery boiler in, produces high-temperature steam, and high-temperature steam can adopt modes such as electricity generation or direct hot water, realizes utilizing.

In order to make the above objects, features and advantages of the embodiments of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

The utility model provides a slag waste heat recovery system not only can be used to the waste heat recovery and the processing of ferroalloy and steel industry slag, still can be used to like other waste heat recovery of smelting the waste residue such as aluminium sediment, copper sediment.

Referring to fig. 1, the slag waste heat recovery system of the present invention includes a heat recovery furnace 100, a granulation tower 200, a waste heat recovery boiler 300, a fan 400, a first cold air channel 301, a second cold air channel 302, a hot air channel 303 and a main air outlet channel 304, wherein the granulation tower 200 is used for cooling and solidifying slag liquid to form slag particles, the heat recovery furnace 100 is used for recovering heat in the slag particles by using a wind quenching method, the main air outlet channel 304 and the first cold air channel 301 are used for guiding cold air in the waste heat recovery boiler 300 to the granulation tower 200 to further cool the slag liquid, the main air outlet channel 304 and the second cold air channel 302 are used for guiding cold air in the waste heat recovery boiler 300 to the heat recovery furnace 100 to further recover heat in the slag particles by using the cold air, the hot air channel 303 is used for guiding hot air generated in the heat recovery furnace 100 to the waste heat recovery boiler 300 to further enable the waste heat recovery boiler 300 to generate high temperature water vapor and cold air by using the hot air, the blower 400 serves to reinforce the flow of the cool air.

In this application, the temperature of the cool air is generally lower than that of the hot air, the cool air refers to the air after heat recovery in the heat recovery boiler 300, and the hot air refers to the air obtained after heat recovery in the slag particles in the heat exchange furnace.

In addition, in the application, the slag has two physical states, wherein one physical state is liquid slag, and the other physical state is solid slag particles.

Technical solutions of embodiments of the present disclosure and how to solve the above technical problems will be described in detail with specific embodiments in conjunction with the accompanying drawings. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.

Referring to fig. 1 and 2a, the granulation tower 200 comprises a rotating shaft 201, a framework 202 and an acting plate 203, the acting plate 203 can be made of heat-resistant stainless steel, the framework 202 is fastened on the rotating shaft 201, the acting plate 203 is conical, the acting plate 203 is covered on the framework 202, the large end opening of the acting plate 203 faces the rotating shaft 201, the acting plate 203 and the framework 202 can do rotating motion along with the rotating shaft 201, and then slag liquid on the top surface of the acting plate 203 is thrown out, cooled and converted into slag particles.

Referring to fig. 1, the heat recovery furnace 100 includes a shell 101, a granulation chamber 102 is disposed in an upper half portion of the shell 101, a granulation tower 200 is disposed in the granulation chamber 102, and a heat exchange cavity 103 is disposed in a lower half portion of the shell 101, the heat exchange cavity 103 is used for collecting slag particles and performing heat exchange, for example, in some embodiments, the shell 101 includes a first shell portion and a second shell portion, and the first shell portion and the second shell portion are connected to each other and enclose the granulation chamber 102 and the heat exchange cavity 103. The bottom of the casing 101 is further provided with a cold air port 104, the side of the casing 101 is further provided with a hot air port 105, and the hot air port 105 and the cold air port 104 can be in the shape of a circular hole, a conical hole and the like.

Referring to fig. 1 and fig. 2a, the waste heat recovery boiler 300 includes a cold air outlet 305 and a hot air inlet 306, the cold air inlet 306 and the cold air outlet 305 may be in the shape of a circular hole, a conical hole, etc., the cold air outlet 305 is connected to one end of a main air outlet channel 304, the other end of the main air outlet channel 304 is communicated with an air inlet of a fan 400, an air outlet of the fan 400 is communicated with one end of a first cold air channel 301 and one end of a second cold air channel 302, the first cold air channel 301 passes through the housing 101 and blows cold air to the bottom surface of the acting plate 203, so that the slag liquid on the top surface of the acting plate 203 is cooled and granulated into slag particles, and the other end of the second cold air channel 302 is communicated with the cold air inlet 104; the hot air inlet 306 is communicated with one end of the hot air channel 303, and the other end of the hot air channel 303 is communicated with the hot air port 105.

In the slag waste heat recovery system of the utility model, the granulating tower 200 is arranged in the granulating chamber 102 in the heat recovery furnace 100, the granulating tower 200 is used for cooling and converting the slag liquid flowing onto the acting plate 203 into slag particles, concretely, the cold air in the waste heat recovery boiler 300 acts on the bottom surface of the acting plate 203 through the first cold air channel 301 from the cold air outlet 305, so that the temperature of the acting plate 203 is reduced, the temperature difference between the acting plate 203 and the slag liquid is large, further, the slag liquid on the acting plate 203 is cooled and solidified to form slag particles, the slag particles fall into the heat exchange cavity 103 of the heat recovery furnace 100, the cold air in the waste heat recovery boiler 300 is blown into the heat exchange cavity 103 through the action of the second cold air channel 302 from the cold air outlet 305, the cold air blown into the heat exchange cavity 103 flows through the surface of the slag particles in the heat exchange cavity 103, the heat of the slag particles is changed into the hot air, the generated hot air is taken away from the hot air outlet 105 of the heat recovery furnace 100, enter into waste heat recovery boiler 300 from waste heat recovery boiler 300's hot-blast import 306 through hot air channel 303, waste heat recovery boiler 300 can utilize hot-air to produce high-temperature steam, and the high-temperature steam of production can be used for the electricity generation etc. so, realizes the waste heat recovery of slag, moreover, compares the heat that the shrend recovered the slag grain, the utility model discloses a slag waste heat recovery system does not have water waste almost, and is littleer to the pollution of environment.

How the slag liquid flows onto the action plate 203 of the granulation tower 200 will be described in detail with reference to the accompanying drawings.

Referring to fig. 1, the system further includes a dumping device 500, a slag tank 600 suspended at one end of the dumping device 500, and a buffer bag 700 disposed outside the top surface of the housing 101, the dumping device 500 may be a hydraulic device, a slag chute is disposed on the buffer bag 700, and slag liquid in the slag tank 600 flows into the buffer bag 700 and flows into the granulation tower 200 from the slag chute under the dumping action of the dumping device 500.

The slag waste heat recovery system of this embodiment, the system set up empty device 500, hoist and mount are in the slag ladle 600 of empting device 500 one end and set up the buffer bag 700 in the outside of casing 101 top surface, can make things convenient for the slag liquid in the slag ladle 600 to empty on acting plate 203 with stable velocity of flow, and when some equipment among the equipment such as blast furnace, the hot stove in ore deposit that produce the slag liquid broke down, slag waste heat recovery system still can operate.

Referring to fig. 1, the system further includes a throttle nozzle 701 disposed on the buffer bag 700, and the throttle nozzle 701 is used for controlling the flow rate of the slag liquid.

The slag waste heat recovery system of this embodiment sets up choke 701 on the buffering package 700 to the flow of control slag liquid can further make slag liquid empty on acting plate 203 with stable velocity of flow, and then makes the slag liquid on the acting plate 203 top surface turn into the slag grain with higher conversion rate, and then improves slag waste heat recovery system's recovery efficiency.

Referring to fig. 1, fig. 2a, fig. 3a and fig. 3b, the system further includes a homogenizer 800, the homogenizer 800 includes a barrel-shaped body, the body may be made of special brown corundum to improve the heat resistance of the body, the body is provided with a lifting lug 801 and a plurality of overflow chutes 802, the lifting lug 801 is hung on the housing 101, the lifting lug 801 may be made of stainless steel, the number of the overflow chutes 802 may be eight, for example, the plurality of overflow chutes 802 are uniformly distributed on the body, and the overflow ends of the overflow chutes 802 are located right above the action plate 203.

In the system for recovering the residual heat from the slag of the embodiment, the slag liquid flowing out of the buffer bag 700 flows into the homogenizer 800, the liquid level of the slag liquid in the homogenizer 800 rises, and when the slag liquid rises to flow out of the overflow tank 802, the slag liquid falls onto the action plate 203. Wherein, a plurality of overflow launders 802 equipartitions are on the body, can be so that from the even action board 203 that falls of the slag liquid that overflow launder 802 flows, and then effectively guarantee the area of contact that the slag liquid can with action board 203, promote the conversion rate that the slag liquid turns into the slag grain, and then promote the recovery efficiency of slag waste heat.

The structure of the granulation tower 200 will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 and fig. 2a, the granulation tower 200 further includes a first motor 204, the first motor 204 may be, for example, a variable frequency speed motor, the first motor 204 is configured to drive the rotating shaft 201 to perform a rotating motion, the rotating shaft 201 performs a rotating motion to drive the framework 202 on the rotating shaft 201 to perform a rotating motion, the framework 202 performs a rotating motion to drive the acting plate 203 on the framework 202 to perform a rotating motion, and the acting plate 203 performs a rotating motion to centrifugally throw away the slag liquid on the top surface of the acting plate 203. The size of the slag particles thrown out by the action plate 203 can be adjusted by adjusting the rotation speed of the rotating shaft 201, and the size of the slag particles is generally controlled to be below about 5 mm. In addition, when the temperature difference between the temperature of the acting plate 203 and the temperature of the slag liquid on the acting plate 203 is large enough, and the heat exchange time is reasonable, the slag liquid can be cooled and solidified to form slag particles.

Referring to fig. 2a, the acting plate 203 includes a plurality of first grooves with notches facing the frame 202 and a plurality of second grooves with notches facing away from the frame 202, the first grooves and the second grooves are spaced apart to form corrugations, the length direction of the first grooves and the second grooves is the radial direction of the acting plate 203, and the radial direction of the acting plate 203 is the X direction shown in fig. 2 b.

In the slag recovery system of this embodiment, the first grooves and the second grooves on the acting plate 203 are arranged at intervals to form corrugations, and when the acting plate 203 makes a revolving motion, the slag liquid on the top surface of the acting plate 203 can flow in the second grooves, so that the size of the slag particles formed by the slag liquid is conveniently controlled.

Referring to fig. 2a and 2b, a first through hole 205 is formed at the top of the cone of the acting plate 203, the first through hole 205 is used for blowing cold air, cold air blown from the first through hole 205 acts on the bottom surface of the homogenizer 800 and spreads around, a second through hole 206 is formed on the conical surface of the acting plate 203 and is offset from the frame 202, and the second through hole 206 is used for blowing cold air.

In the slag recovery system of this embodiment, the first through hole 205 and the second through hole 206 are disposed on the acting plate 203, so that heat of the acting plate 203 can be taken away in time, the temperature of the slag liquid on the top surface of the acting plate 203 is rapidly reduced and solidified to form slag particles, and meanwhile, the formed slag particles can be discharged from the second through hole 206 in time, thereby improving the conversion rate of the granulating tower 200 for converting the slag liquid into the slag particles.

Referring to fig. 2a and 2b, the frame 202 includes a plurality of ribs 207, the ribs 207 may be hollow structures, the plurality of ribs 207 may be fastened to form a frame shaped like a Chinese character 'mi', the frame shaped like a Chinese character 'mi' may be multi-layered, for example, the frame shaped like a Chinese character 'mi' may be two-layered frame shaped like a Chinese character 'mi', each rib 207 is provided with a reinforcing rib, and the reinforcing ribs are configured to be fan blade-shaped.

In the slag recovery system of this embodiment, the plurality of ribs 207 are fastened to form a frame shaped like a Chinese character 'mi', which can conveniently fix and support the active plate 203, reduce material consumption, and save cost, and each rib 207 is provided with a reinforcing rib which can improve the strength of the framework 202, and the reinforcing ribs on the ribs 207 constituting the frame shaped like a Chinese character 'mi' are configured into fan blade shapes, so that the blowing effect can be increased when the framework 202 makes a rotary motion, and further cold air can effectively act on the active plate 203 under the action of the cold air, and further the heat on the active plate 203 can be effectively taken away in time, thereby improving the conversion rate of slag liquid into slag particles by the granulating tower 200, forming the plurality of ribs 207 forming the framework 202 into a multi-layer frame shaped like a Chinese character 'mi', which can not only increase the strength of the framework 202, but also further increase the blowing effect, and further enable the cold air to effectively act on the active plate 203, thereby effectively taking away the heat on the action plate 203 in time and improving the conversion rate of the slag liquid into slag particles by the granulation tower 200.

Referring to fig. 1 and 2a, the granulation tower 200 further comprises a reflective plate 208, the reflective plate 208 may be formed by splicing a plurality of rectangular heat-resistant cast steels, the reflective plate 208 is disposed radially outside the acting plate 203, the reflective plate 208 reduces the size of the slag particles thrown onto the acting plate 203 and changes the movement direction of the slag particles, that is, the reflective plate 208 is used for preventing the slag particles from splashing outside the granulation chamber 102 and enabling the slag particles splashed onto the reflective plate 208 to collide and break. The reflection plate 208 is further provided with second thermocouples for detecting the temperature of the reflection plate 208, and the number of the second thermocouples may be six, eight, and the like.

The slag recovery system of this embodiment, set up reflecting plate 208 in the radial outside of acting plate 203, when doing rotary motion with plate 203, the slag grain that acting plate 203 was thrown away can spatter on reflecting plate 208, spatter the slag grain on reflecting plate 208, can be collided and split into the littleer slag grain of a plurality of sizes, when the littleer slag grain of size exchanges heat in heat transfer chamber 103, the area of contact of slag grain and cold air increases, more heats on the slag grain can be taken away to the cold air, promote slag recovery system's recovery heat efficiency. The second thermocouple is arranged on the reflecting plate 208 to detect the temperature of the reflecting plate 208, so that the temperature of the reflecting plate 208 can be conveniently controlled, the temperature of the granulating chamber 102 can be further controlled, the flow of cold air acting on the acting plate 203 can be further regulated, and the conversion rate of converting the slag liquid into slag particles by the granulating tower 200 can be improved.

The distribution of the cold air acting in the granulation tower 200 will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 and fig. 2a, the first cooling air channel 301 includes a first air outlet section 307, a second air outlet section 308 and a third air outlet section 309, wherein one end of the first air outlet section 307 and one end of the second air outlet section 308 are simultaneously communicated with one end of the third air outlet section 309, the other end of the first air outlet section 307 blows air to the bottom surface of the acting plate 203, the other end of the second air outlet section 308 blows air into the granulating chamber 102 from the top surface of the acting plate 203 to the bottom surface of the acting plate 203, and the other end of the third air outlet section 309 is communicated with an air outlet of the fan 400.

In the slag waste heat recovery system of the embodiment, the first air outlet section 307 blows air to the bottom surface of the acting plate 203, and the second air outlet section 308 blows air to the inside of the granulating chamber 102, so that the temperature of the acting plate 203 can be rapidly reduced, the temperature difference between the acting plate 203 and slag particles is increased, the slag liquid on the acting plate 203 can be rapidly reduced and solidified to form slag particles, and further the conversion rate of the granulating tower 200 for converting the slag liquid into the slag particles is increased.

Referring to fig. 1, the third air outlet section 309 is provided with a first flow regulating valve 310 and a flow meter 311, the flow meter 311 is used for detecting the flow rate of the cooling air in the third air outlet section 309, the first flow regulating valve 310 can regulate the flow rate of the cooling air in the third air outlet section 309, and the first flow regulating valve 310 can be accurately regulated according to the flow rate of the cooling air in the third air outlet section 309 detected by the flow meter 311, so as to control the flow rate of the cooling air in the third air outlet section 309.

In some embodiments, the slag waste heat recovery system of this embodiment further includes a control unit, the control unit is in communication connection with the first flow regulating valve 310 and the flow meter 311, and the control unit is configured to control the first flow regulating valve 310 according to the flow rate of the cold air in the third air outlet section 309 detected by the flow meter 311, so that the flow rate of the cold air in the third air outlet section 309 can enable the slag liquid on the acting plate 203 to be converted into slag particles with a relatively high conversion rate, and further, the waste heat recovery utilization rate of the slag waste heat recovery system is improved.

Referring to fig. 1, the second cool air duct 302 is provided with a second flow regulating valve 312 and a pressure gauge 313, the pressure gauge 313 is used for detecting the pressure of the cool air in the second cool air duct 302, the second flow regulating valve 312 is used for regulating the flow rate of the cool air in the second cool air duct 302, and the second flow regulating valve 312 can be accurately regulated according to the pressure of the cool air in the second cool air duct 302 detected by the pressure gauge 313, so as to control the flow rate of the cool air in the second cool air duct 302.

In some embodiments, in the slag waste heat recovery system of this embodiment, the control unit is in communication connection with the pressure gauge 313 and the second flow regulating valve 312, and the control unit is configured to control the second flow regulating valve 312 according to the pressure of the cold air in the second cold air channel 302 detected by the pressure, so that the flow of the cold air in the second cold air channel 302 can enable heat exchange between the slag particles and the cold air in the heat recovery furnace 100 at a relatively high heat exchange rate, thereby improving the recovery efficiency of heat of the slag particles, and further improving the waste heat recovery utilization rate of the slag waste heat recovery system.

The structure of the heat recovery furnace 100 will be described in detail below with reference to the accompanying drawings.

Insulating bricks opposite to the inner side wall of the shell 101 are built in the shell 101, wear-resistant steel bricks are built on the lower half portion of the inner side of each insulating brick, refractory bricks are built on the upper half portion of the inner side of each insulating brick, and perlite and rock wool are filled between each insulating brick and the shell 101.

The slag waste heat recovery system of this embodiment builds insulating brick in casing 101, can effectively obstruct the heat transfer between the inside and outside air of casing 101, and then improves the utilization ratio of hot air in heat recovery furnace 100. Wear-resisting steel bricks are built on the lower half portion of the inner side of the insulating brick, slag particles directly rub with the wear-resisting steel bricks, the wear-resisting steel bricks can protect the insulating brick, refractory bricks are built on the upper half portion of the inner side of the insulating brick, high-temperature slag liquid or slag particles can directly act on the refractory bricks, and the refractory bricks perform fire protection on the insulating brick. Perlite and rock wool are filled between the insulating brick and the shell 101, the perlite and the rock wool have low heat conductivity coefficient and wide application range, and can further effectively block heat transfer between the air inside and outside the shell 101, so that the utilization rate of the hot air in the heat recovery furnace 100 is improved.

Referring to fig. 1 and 4, the heat recovery furnace 100 further includes a flow guide plate 106 fastened to the casing 101, the flow guide plate 106 is funnel-shaped, a small end opening of the flow guide plate 106 is disposed right above the cold air port 104, and a large end opening of the flow guide plate 106 is disposed opposite to the granulating chamber 102.

Referring to fig. 4, a plurality of baffles 107 are disposed on the inner surface of the flow guide plate 106, the baffles 107 may be annular baffles 107, and the baffles 107 may be disposed perpendicular to the inner surface of the flow guide plate 106.

Referring to fig. 4, a cooling chamber 108 is disposed inside the flow guiding plate 106, a cold water inlet pipe 109 and a hot water outlet pipe 110 communicated with the cooling chamber 108 are disposed on the flow guiding plate 106, and the cold water inlet pipe 109 extends into the small-end opening of the flow guiding plate 106.

The slag waste heat recovery system of this embodiment, after granulation tower 200 turned into the slag grain with the slag liquid, the slag grain spattered reflecting plate 208, the slag grain that spattered on the reflecting plate 208 acted through guide plate 106, drop in the heat transfer chamber 103 in the heat recovery furnace 100, and under the effect of guide plate 106, the slag grain that drops in heat transfer chamber 103 was the tower around hood 904 and piled up the distribution, and then it is big to make between the cold air of blowing from hood 904 and the slag grain around hood 904 effective heat transfer area, the heat exchange efficiency between cold air and the slag grain is high, promote slag waste heat recovery system's heat recovery efficiency. The baffle plate 107 is arranged on the guide plate 106, so that the stay time of the slag particles on the guide plate 106 can be prolonged, the slag liquid which is not converted into the slag particles and the bonded slag particles are cooled on the guide plate 106, and then the slag particles are cooled and converted into the slag particles. Set up cooling chamber 108 in guide plate 106 inside, and make the cold water inlet tube 109 that sets up on guide plate 106 stretch into the tip opening of guide plate 106, the hot water outlet pipe 110 that sets up on guide plate 106 in time trades the hot water of guide plate 106 main aspects open position away, can be effectively lasting make the temperature of guide plate 106 keep lower temperature, make the slag liquid that does not turn into the sediment grain, the sediment grain of bonding obtains effective cooling on guide plate 106, and then the cooling turns into the sediment grain, the area of contact of the sediment grain in the increase heat transfer chamber 103 and cold air, the heat recovery efficiency of increase sediment grain.

Referring to fig. 1, an infrared thermal imager 111 is disposed on a side wall of the housing 101 for observing a distribution of slag particles in the housing 101.

The slag waste heat recovery system of this embodiment, the infrared thermal imager 111 that sets up on the lateral wall of casing 101 can be used for observing the distribution condition of the slag particle in the casing 101, is convenient for judge whether the distribution condition of the slag particle in the casing 101 does benefit to the heat exchange of slag particle and cold air, when observing that the slag particle is the toper heap and puts in hood 904 four weeks, can judge the distribution condition of slag particle this moment, does benefit to the heat exchange of slag particle and cold air.

Referring to fig. 1, a first thermocouple 112 is further disposed on a side wall of the housing 101 for detecting a temperature of the hot air blown from the hot air port 105.

In the slag waste heat recovery system of this embodiment, the first thermocouple 112 is configured to detect a temperature of hot air blown out from the hot air port 105, so as to determine whether a heat exchange efficiency between slag particles and cold air in the housing 101 is within a reasonable range, when the temperature of hot air blown out from the hot air port 105 detected by the first thermocouple 112 is too low, the flow rate of cold air in the first cold air channel 301 can be conveniently adjusted in time, a conversion rate of slag liquid into slag particles by the granulation tower 200 is increased, a flow rate of cold air in the second cold air channel 302 is adjusted, a temperature difference between slag particles and cold air in the heat recovery furnace 100 is increased, a rate of cooling water on the guide plate 106 entering the cooling chamber 108 is adjusted, and an efficiency of converting slag liquid into slag particles on the guide plate 106 is increased.

How the slag particles subjected to heat recovery in the heat recovery furnace 100 are discharged for reuse will be described in detail with reference to the accompanying drawings.

Referring to fig. 1 and 5, the system further comprises a conical crusher 900, the conical crusher 900 comprises a housing, a driving shaft 901, a supporting seat 902, a conical movable jaw 903 and a conical fixed jaw arranged in the housing, the conical movable jaw 903 and the conical fixed jaw are approximately in the shape of a bevel gear, one end of the driving shaft 901 is fastened to the supporting seat 902, the conical movable jaw 903 is fastened to the outer peripheral side of the supporting seat 902, the conical movable jaw 903 is rotatably arranged in the conical fixed jaw, and the conical movable jaw 903 and the conical fixed jaw are arranged in the heat exchange cavity 103 to crush slag particles.

The system further comprises a second motor and a speed reducer, the second motor is in transmission connection with the other end of the driving shaft 901, the second motor is used for driving the driving shaft 901 to rotate, the second motor can be a speed-regulating variable frequency motor, for example, an input shaft of the speed-regulating variable frequency motor is connected with an input shaft of the speed reducer, a pinion is arranged on the input shaft of the speed reducer, and the pinion is meshed with a gearwheel arranged on the driving shaft 901.

Referring to fig. 1 and 5, the conical crusher 900 further includes a hood 904 disposed in the heat exchange cavity 103, the hood 904 may be cast and processed by stainless steel or cast steel, the hood 904 is fastened to the top of the support 902 and encloses an air cavity with the support 902, the support 902 is provided with a cold air hole, the hood 904 is provided with a plurality of air holes 905, and the cold air hole and the air holes 905 communicate with the inside and the outside of the air cavity.

The slag waste heat recovery system of this embodiment, the slag grain that produces in the granulation tower 200, after dropping in heat transfer chamber 103, the slag grain gets into to be located between toper bazoon and the toper movable jaw 903 in heat transfer chamber 103, and toper movable jaw 903 is fixed the jaw and is rotated relatively the toper, can make and get into the toper movable jaw 903 and the toper and decide the broken slag grain between the jaw, the size of slag grain diminishes, can prevent that the slag grain of large granule from blockking up the cold wind mouth 104 of heat recovery furnace 100, the slag grain of being convenient for is discharged from the broken 900's of toper discharge gate. Set up hood 904 at the top of supporting seat 902, can avoid the sediment grain to pile up, plug up the cold wind mouth 104 that sets up on heat recovery stove 100, and can be so that the cold air that gets into from the cold wind mouth 104 of heat recovery stove 100, even outwards blows out, increases the area of contact of cold air and sediment grain, promotes heat exchange efficiency.

Referring to fig. 1, the conical crusher 900 further includes a first level gauge 906, a second level gauge 907 and a wind blocking material flow valve 908, the wind blocking material flow valve 908 is disposed at a discharge port of the conical crusher 900, and the first level gauge 906 and the second level gauge 907 are disposed on a housing of the conical crusher 900; when the first level meter 906 detects that the position of the slag particles in the conical crusher 900 reaches a first position, the air blocking flow valve 908 is kept closed, so that the position of the slag particles in the conical crusher 900 is raised; when the second level gauge 907 detects that the position of the slag particles in the conical crusher 900 reaches a second position, the air blocking flow valve 908 is opened to enable the slag particles in the conical crusher 900 to flow out, wherein the second position is higher than the first position.

In the slag waste heat recovery system of this embodiment, the air blocking material flow valve 908 is used for opening or closing a discharge hole of the conical crusher 900, the first material level meter 906 is used for detecting whether the position height of slag particles in the conical crusher 900 reaches a first position, the second material level meter 907 is used for detecting whether the position height of slag particles in the conical crusher 900 reaches a second position, when the first material level meter 906 detects that the position of slag particles in the conical crusher 900 reaches the first position, the air blocking material flow valve 908 is closed, the position of slag particles in the conical crusher 900 rises, and when the second material level meter 907 detects that the position of slag particles in the conical crusher 900 reaches the second position, the air blocking material flow valve 908 is opened to allow slag particles in the conical crusher 900 to flow out, so that the cold air vent 104 arranged on the heat recovery furnace 100 is in an effective open state.

In some embodiments, the control unit is in communication connection with the first level gauge 906, the second level gauge 907 and the wind blocking flow valve 908, when the first level gauge 906 detects that the position of the slag particles in the conical crusher 900 reaches a first position, the control unit controls the wind blocking flow valve 908 to be kept closed so as to enable the position of the slag particles in the conical crusher 900 to rise, and when the second level gauge 907 detects that the position of the slag particles in the conical crusher 900 reaches a second position, the control unit controls the wind blocking flow valve 908 to be opened so as to enable the slag particles in the conical crusher 900 to flow out, so that the automatic control of the discharge of the slag particles in the conical crusher 900 is realized.

Referring to fig. 1, the slag waste heat recovery system of this embodiment further includes a belt conveyor a00, the belt conveyor a00 is disposed below the air shutoff stream valve 908, when the air shutoff stream valve 908 is opened, slag particles in the conical crusher 900 fall onto the belt conveyor a00 and are timely transported away, and the slag particles discharged from the conical crusher 900 can be used for preparing cement, so as to improve the utilization rate of slag.

In some embodiments, in the slag waste heat recovery system, the slag particles below the cone crusher 900 are directly transported to the cement plant by an automobile.

How the steam generated by the heat recovery steam generator 300 generates electricity will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1, the system further includes a steam turbine B00, a generator C00, and a steam channel 314, wherein one end of the steam channel 314 is communicated with a steam outlet 315 disposed on the heat recovery boiler 300, the other end of the steam channel 314 is communicated with a steam turbine B00, and the steam turbine B00 is in transmission connection with the generator C00.

According to the slag waste heat recovery system of the embodiment, after hot air enters the waste heat recovery boiler 300, steam is generated, the steam enters the steam turbine B00 through the steam channel 314, the energy carried by the steam can be converted into mechanical motion through the steam turbine B00, the mechanical motion converted out through the steam turbine B00 can drive the generator C00 to generate electricity, and therefore the heat in slag liquid can be recycled.

How the slag waste heat recovery system removes dust is described in detail below with reference to the accompanying drawings.

Referring to fig. 1, the system further includes a gravity dust collector D00, the hot air channel 303 includes a first sub-section 316 and a second sub-section 317, one end of the first sub-section 316 is communicated with the hot air port 105, the other end of the first sub-section 316 extends into the gravity dust collector D00, an outlet of the gravity dust collector D00 is communicated with one end of the second sub-section 317, and the other end of the second sub-section 317 is communicated with the hot air inlet 306.

In the slag waste heat recovery system of this embodiment, the hot air in the heat recovery furnace 100 is discharged from the hot air port 105, and enters the gravity dust collector D00 after passing through the first subsection 316, because the hot air discharged from the heat recovery furnace 100 carries particulate matters, the particulate matters enter the gravity dust collector D00, the particulate matters and the hot air can be separated, the separated particulate matters remain inside the gravity dust collector D00, the hot air is discharged from the outlet of the gravity dust collector D00, and after passing through the second subsection 317, the hot air enters the waste heat recovery boiler 300 from the hot air inlet 306 of the waste heat recovery boiler 300, and further steam is generated inside the waste heat recovery boiler 300. Exhausted hot air and carried particulate matters in the heat recovery furnace 100 are dedusted in the gravity deduster D00, the fault of the waste heat recovery boiler 300 can be effectively prevented, and the reliable working time of the slag waste heat recovery system is prolonged.

Referring to fig. 1, the system further includes a bag-type dust collector E00, and the main air outlet channel 304 includes a first main section 318 and a second main section 319; one end of the first main section 318 is communicated with the cold air outlet 305, the other end of the first main section 318 is communicated with an inlet of a bag-type dust remover E00, an outlet of a bag-type dust remover E00 is communicated with one end of the second main section 319, and the other end of the second main section 319 is communicated with an air outlet of the fan 400.

The slag waste heat recovery system of this embodiment, after waste heat recovery boiler 300 is inside to utilize hot-air to produce steam, still produces cold air, and cold air is discharged from waste heat recovery boiler 300's cold wind export 305, enters into sack cleaner E00 through first total section 318, and behind the dust removal of sack cleaner E00, enters into fan 400 through the second total interruption, after fan 400 blast air, enters into in first cold wind passageway 301 and the second cold wind passageway 302. The cold air discharged from the waste heat recovery boiler 300 enters the fan 400 after being dedusted by the bag-type deduster E00, so that the fan 400 can be effectively prevented from being out of order, and the reliable working time of the slag waste heat recovery system is prolonged.

The following describes the operation of the slag waste heat recovery system of this embodiment:

firstly, the fan 400, the waste heat recovery boiler 300 and the granulation tower 200 are started, the first flow regulating valve 310 on the first cold air channel 301 and the second flow regulating valve 312 on the second cold air channel 302 are opened at the same time, secondly, the slag liquid is poured into the slag tank 600, the slag liquid in the slag tank 600 is poured into the buffer bag 700 by the pouring device 500, the slag liquid flows into the homogenizer 800 from the slag runner of the buffer bag 700, the slag liquid in the homogenizer 800 uniformly flows onto the action plate 203 of the rotating granulation tower 200, the action plate 203 throws the slag particles onto the reflection plate 208, the slag particles fall onto the guide plate 106 and further onto the heat recovery furnace 100 under the action of the guide plate 106, then, the cone crusher 900 and the conveyor a00 are started, the slag particles in the heat recovery furnace 100 are crushed by the cone crusher 900, discharged from the cone crusher 900 and fall onto the conveyor a00, then, the steam turbine B00 is started, and the hot air discharged from the heat recovery furnace 100 to the waste heat recovery boiler 300, steam is generated in the heat recovery boiler 300, and the steam drives the steam turbine B00 to make mechanical motion, so as to drive the generator C00 to generate electricity.

The power generation amount of the slag heat recovery system of the present embodiment is described below using a blast furnace as an example:

one seat is 3000m³The blast furnace of (1) produces 6900 tons of molten iron per day, the amount of blast furnace slag produced per ton of iron is 350Kg, and the amount of blast furnace slag produced per day is about 2415 tons, calculated according to the utilization factor of 2.3. The enthalpy heat of each ton of blast furnace slag is about 1797KJ/Kg, the calorific value of the standard coal is about 29260KJ/Kg, and the enthalpy heat of each ton of blast furnace slag is equivalent to 1797000 KJ/29260 KJ/Kg to 61.41Kg of standard coal. Assuming that the heat recovery efficiency is 90% and the standard coal generating one-degree electricity is calculated as 300g/kwh, the power generation amount of the blast furnace slag per ton is 61.41kgx 90% ÷ 0.300 kg/kwh-184.23 kwh. To sum up, a seat of 3000m³Blast furnace slag heat recovery power generation amount per dayFor 2415T 184.23 kwh/T444915.45 kwh, one watt of electricity was calculated as 0.6 yuan, and the monthly economic profit gross income was about 444915.45kwh 0.6 yuan/kwh 30 days 8008478 yuan. Therefore, the slag waste heat recovery system of the embodiment has the advantages of high heat recovery efficiency, large power generation amount and high economic benefit.

In the slag waste heat recovery system of this embodiment, hot air generated in the heat recovery furnace 100 enters the gravity dust collector D00 through the first subsection 316, particulate matters carried in the hot air are purified in the gravity dust collector D00, the hot air purified by the gravity dust collector D00 enters the waste heat recovery boiler 300 through the second subsection 317, cold air generated in the waste heat recovery boiler 300 enters the bag-type dust collector E00 through the first total section 318, the particulate matters carried in the cold air are purified in the bag-type dust collector E00, and are discharged into the fan 400 through the second total section 319, and then are discharged into the granulating chamber 102 through the first cold air channel 301, and are discharged into the heat exchange chamber 103 through the second cold air channel 302, which shows that: in the whole flowing process of the air, the air flows in the first subsection 316, the second subsection 317, the first total subsection 318, the second total subsection 319, the first cold air channel 301 and the second cold air channel 302, so that the environmental pollution is small, and the heat loss is small.

In the slag waste heat recovery system of the embodiment, the vitrification rate of the slag particles discharged from the conical crusher 900 is more than or equal to 95%, the water content of the slag particles is less than or equal to 15%, and the fine particle size of the slag particles is more than or equal to 85% (the size of the slag particles is within the range of 0-4 mm, and the particle rate of the slag particles reaches more than 85%), so that the slag waste heat recovery system meets the requirements of cement production.

The slag waste heat recovery system of this embodiment compares the fluidized bed and retrieves the slag waste heat, and the contact between the slag particle in the heat recovery stove 100 and the cold air is more even abundant, and slag waste heat recovery efficiency is high, more is favorable to the increasing slag output demand of steel industry.

The slag waste heat recovery system of this embodiment compares water quenching method and to slag grain waste heat recovery, can remove the stoving technology of cement factory from, practices thrift the energy consumption, reduces the cement cost, and slag grain does not contact with water in the cooling process, has solved that slag grain meets water and has generated SO₂、H₂S gas pollutes the environment, avoidingThe evaporation loss of water (each ton of slag adopts water quenching to recover heat, and the consumption of new water is 0.8-1.2 tons), the consumption of slag flushing water is effectively reduced, water resources are saved, a high-pressure water slag flushing link is omitted, a large sedimentation tank or a water cooling tank is not required to be built in front of the furnace, the influence on the normal production of the blast furnace due to the reduction of water quenching equipment is avoided, a wear-resistant slag flushing water channel is not required to be installed, the equipment investment and spare part consumption are saved, the equipment is simple, the maintenance is easy, the failure rate is low, the operation energy consumption is low, the heat recovery efficiency is high, the heat recovery power generation of each ton of slag can reach 184.23kwh, and good economic benefit and social benefit are generated.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. The slag waste heat recovery system is characterized by comprising a granulation tower;

the granulation tower comprises a rotating shaft, a framework and an action plate;

the framework is fastened on the rotating shaft;

the action plate is conical, the action plate covers the framework, the large-end opening of the action plate faces the rotating shaft, the action plate and the framework can do rotating motion along with the rotating shaft, and then slag liquid on the top surface of the action plate is thrown out and cooled to be converted into slag particles.

2. The slag waste heat recovery system according to claim 1, wherein the active plate comprises a plurality of first grooves with notches facing the framework and a plurality of second grooves with notches facing away from the framework, the first grooves and the second grooves are arranged at intervals to form corrugations, and the groove length directions of the first grooves and the second grooves are radial directions of the active plate.

3. The slag waste heat recovery system according to claim 1, wherein the conical vertex of the action plate is provided with a first through hole through which cooling air is blown.

4. The slag waste heat recovery system according to claim 1, wherein a second through hole which is staggered with the framework is formed in the conical surface of the acting plate, and the second through hole is used for being blown by cooling air.

5. The slag waste heat recovery system of claim 2, wherein the skeletal frame comprises a plurality of ribs fastened to form a frame in a shape of a Chinese character 'mi'.

6. The slag waste heat recovery system according to claim 5, wherein each rib is provided with a reinforcing rib, and the reinforcing ribs are arranged in a fan blade shape.

7. The slag waste heat recovery system of claim 5, wherein a plurality of the ribs are fastened to form a plurality of layers of the frame in a shape of a Chinese character 'mi'.

8. The slag waste heat recovery system according to claim 1, wherein the granulation tower further comprises a reflection plate disposed radially outside the action plate, the reflection plate making the particles of the slag particles thrown onto the action plate smaller and serving to change the moving direction of the slag particles.

9. The slag waste heat recovery system according to any one of claims 1 to 8, wherein the system further comprises a heat exchanger, a waste heat recovery boiler, a first cold air passage, a second cold air passage, and a hot air passage;

the heat exchanger comprises a shell, wherein a granulating chamber is arranged at the upper half part of the shell, the granulating tower is arranged in the granulating chamber, a heat exchange cavity is arranged at the lower half part of the shell and is used for collecting the slag particles and exchanging heat, a cold air port is also arranged at the bottom of the shell, and a hot air port is also arranged at the side part of the shell;

the waste heat recovery boiler comprises a cold air outlet and a hot air inlet, the cold air outlet is communicated with one end of the first cold air channel and one end of the second cold air channel, the first cold air channel penetrates through the shell and blows cold air to the bottom surface of the acting plate so that the slag liquid on the top surface of the acting plate is cooled and converted into the slag particles, and the other end of the second cold air channel is communicated with the cold air inlet; the hot air inlet is communicated with one end of the hot air channel, and the other end of the hot air channel is communicated with the hot air port.

10. The slag waste heat recovery system according to claim 9, further comprising a steam turbine, a generator and a steam channel, wherein one end of the steam channel is communicated with a steam outlet arranged on the waste heat recovery boiler, the other end of the steam channel is communicated with the steam turbine, and the steam turbine is in transmission connection with the generator.

11. The slag waste heat recovery system of claim 9 wherein insulation bricks are laid within the shell opposite the inner side walls of the shell.

12. The slag waste heat recovery system according to claim 11, wherein the lower inner half of the insulating brick is constructed with wear-resistant steel bricks, and the upper inner half of the insulating brick is constructed with refractory bricks.

13. The slag waste heat recovery system of claim 11, wherein perlite and rock wool are filled between the insulating bricks and the shell.

14. The slag waste heat recovery system of claim 9, wherein the heat exchanger further comprises a deflector fastened to the housing, the deflector is funnel-shaped, a small end opening of the deflector is disposed directly above the cold air port, and a large end opening of the deflector is disposed opposite to the granulating chamber.

15. The slag waste heat recovery system of claim 14 wherein the inner surface of the deflector is provided with a plurality of striker plates.

16. The slag waste heat recovery system according to claim 15, wherein a cooling chamber is arranged inside the guide plate, a cold water inlet pipe and a hot water outlet pipe which are communicated with the cooling chamber are arranged on the guide plate, and the cold water inlet pipe extends into the small-end opening of the guide plate.

17. The slag waste heat recovery system according to claim 9, wherein an infrared thermal imager is disposed on a side wall of the housing for observing the distribution of the slag particles in the housing; and/or the presence of a gas in the gas,

and the side wall of the shell is also provided with a thermocouple for detecting the temperature of hot air blown out from the hot air port.