WO2019174287A1

WO2019174287A1 - Slag residual heat utilization device and molten slag granulation method

Info

Publication number: WO2019174287A1
Application number: PCT/CN2018/115146
Authority: WO
Inventors: 郭瑛; 张晓东; 单宏伟; 赵臣; 范文兵; 赵娟
Original assignee: 南京有荣节能科技有限公司
Priority date: 2018-03-16
Filing date: 2018-11-13
Publication date: 2019-09-19
Also published as: JP2021508026A; JP7179868B2

Abstract

Disclosed are a slag residual heat utilization device and a molten slag granulation method. The slag residual heat utilization device comprises a residual heat recycling recoverer (1), the residual heat recycling recoverer (1) being sequentially provided with an outer shell (11), an outer shell lining (12), an inner shell (13), and an inner shell lining (14) from the outside to the inside, an air extracting tube (15) is provided between the outer shell (11) and the outer shell lining (12) in a penetrating manner, and a slag disk (16) is fixedly provided at the bottoms of the inner shell (13) and the inner shell inner lining (14); and the inner shell lining (14) and the slag disk (16) cooperate to form an air inlet chamber (130), and the outer shell lining (12), the inner shell (13) and the slag disk (16) cooperate to form a slag storage chamber (100). By adding a convective heat transfer mode to the existing slag residual heat utilization device, the heat exchange efficiency of the slag residual heat utilization device is further improved.

Description

Slag waste heat utilization device and molten slag granulation method

The application requires the application date to be March 16, 2018, the application number is 201810220462.2, the name is "a slag waste heat utilization device" and the application date is September 13, 2018, the application number is 201811066398.3, and the name is "a melting The priority of the Chinese patent application of the slag granulation method, the entire contents of which is incorporated herein by reference.

Technical field

The present disclosure relates to the field of waste heat utilization technology, and relates to, for example, a slag waste heat utilization device and a molten slag granulation method.

Background technique

Slag is an inevitable by-product of the steelmaking process, and the discharge of slag is about 12%-15% of the crude steel production. The slag formation temperature is 1500 ° C -1700 ° C, with high sensible heat, so slag is one of the main by-products in the steel production process, belonging to high grade waste heat resources, with high recycling value. Reasonable use and effective recovery of slag can achieve sustainable development of the steel industry, reduce production costs, improve the economic efficiency of enterprises, and at the same time reduce pollution and turn waste into treasure.

The slag granulation technology practically applied in the related art includes:

1. The hot pouring method, the hot pouring method splashes the molten slag onto the slag bed, and sprays a proper amount of water to the molten slag, so that the high-temperature slag is rapidly cooled and broken, and then the loader is used to excavate the loading and transport to the waste slag yard. Or slag treatment workshop, and then process such as pulverization, screening and magnetic separation. The process equipment of this method is simple and the technology is mature, but the floor space is large, the pollution is serious, and the stability of the steel slag after treatment is poor. Second, the slag pit (can) granulation method, the granulation method pours the molten slag into the slag sump (tank), sprinkles water on the surface of the slag to cool and closes the cover, and the steam formed by the cooling water steams the slag. And reacting with a small amount of free calcium oxide in the slag to form calcium hydroxide, and the volume of calcium hydroxide is expanded, thereby causing the slag to rise and break. The granulation process has a long process flow, large investment, and high treatment cost. In particular, steam reacts with free calcium oxide in the high-temperature slag, and is decomposed into hydrogen and oxygen at a high temperature, and there is a hidden danger of hydrogen explosion.

The application No. CN201510754750.2 discloses a recycling device and a method for recovering residual heat of an electric arc furnace steelmaking slag. The patent is mainly directed to the waste heat recovery steam production of an electric arc furnace steelmaking slag, and is indeed advanced and novel. However, the patent has the following deficiencies: 1) the application field is too narrow, and is limited to the waste heat recovery of the electric arc furnace steelmaking slag; 2) only produces saturated steam, which is unfavorable for stable operation of extended power generation; 3) less control means for equipment operation It is difficult to cope with the ever-changing industrial conditions; 4) the heat transfer mechanism lacks convective heat transfer, and the heat exchange efficiency is relatively low.

Summary of the invention

The present disclosure provides a slag waste heat utilization device and a molten slag granulation method, which can solve the problems of low heat exchange efficiency and low slag recovery efficiency of the slag waste heat recovery equipment in the related art.

A slag waste heat utilization device, comprising a waste heat recovery device; wherein the waste heat recovery device comprises an outer casing, an outer casing inner casing, an inner casing and an inner casing inner sleeve which are arranged from the outside to the inside; the exhaust pipe is disposed in the Between the outer casing and the inner casing of the outer casing; a slag plate fixed to the bottom of the inner casing and the inner casing inner casing, and the inner casing, the inner casing inner sleeve and the slag tray are both set to Rotating with respect to the outer casing and the outer casing of the outer casing, the inner casing inner sleeve and the slag disk cooperate to form an air inlet cavity, and the outer casing inner casing, the inner casing and the slag disk cooperate to form a slag a chamber having an air inlet end facing the slag chamber, an agitator disposed outside the inner casing, and a vent tube communicating with the air inlet chamber.

An embodiment provides a molten granulation granulation method, which is carried out by using the slag waste heat utilization device described above, the slag granulation method comprising: pouring molten slag and a cooled solidified solid block together into the waste heat recovery device Having the molten slag filled in a gap between the solid blocks, thereby cooling the molten slag and causing the molten slag to form a slag; and from the waste heat recovery device The air is absorbed into the air to cause the slag to gradually break into particles.

DRAWINGS

1 is a schematic structural view of a waste heat recovery device of a slag waste heat utilization device provided in Embodiment 1;

2 is a schematic structural view of a slag waste heat utilization device provided in Embodiment 1;

3 is a schematic structural view of a steam turbine power generating portion of the slag waste heat utilization device provided in the first embodiment;

4 is a schematic view showing a connection structure of a controller of a slag waste heat utilization device provided in Embodiment 1;

Fig. 5 is a flow chart showing the method of the molten slag granulation method provided in the second embodiment.

In the picture:

1, waste heat recovery device; 11, outer casing; 12, inner casing; 13, inner casing; 14, inner casing inner casing; 15, exhaust pipe; 16, slag disk; 17, slag ring;

21, a first slag cooler; 22, a second slag cooler; 23, a slag breaker; 24, a ventilation pipe;

31, feeding funnel; 32, heat preservation cover; 33, radiation heat exchange tube;

41, the first tube; 42, the second tube; 43, the third tube;

51, superheater; 52, evaporator; 53, economizer; 54, steam turbine; 55, generator; 56, condenser; 57, cooling tower; 58, cool pool;

61, accumulator; 62, steam drum; 63, circulating water pump;

71, cyclone dust collector; 72, gravity dust collector; 73, circulation fan;

81, support sleeve; 82, weight sensor;

91, discharge chute; 92, conveyor belt conveyor; 93, lifting hopper; 94, winch; 95, magnetic separation belt machine; 96, silo; 97, scrap steel warehouse; 98, transport truck;

100, slag chamber; 110, first water inlet chamber; 120, second water inlet chamber; 130, air inlet chamber;

200, controller; 210, in-position sensor; 220, hydraulic solenoid valve.

detailed description

Embodiment 1

As shown in FIG. 1 , a slag waste heat utilization device provided by the embodiment includes a waste heat recovery device 1 , which is provided with an outer casing 11 , an inner casing 12 , an inner casing 13 and an inner casing from the outside to the inside. The inner sleeve 14, the inner casing 13 and the inner casing inner sleeve 14 constitute a truncated-like structure, and the bottoms of the inner casing 13 and the inner casing inner sleeve 14 are fixed on the slag tray 16, the inner casing 13, the inner casing inner sleeve 14 and the slag The discs 16 are each rotatable relative to the outer casing 11 and the inner casing 12. The outer casing 12, the inner casing 13 and the slag tray 16 cooperate to form a slag chamber 100; the inner casing inner sleeve 14 cooperates with the slag tray 16 to form an air inlet chamber 130, and an outer side of the inner casing 13 is provided with a stirrer; the outer casing 11 and the inner casing of the outer casing An exhaust duct 15 is disposed between the 12, and the air inlet end of the air exhaust duct 15 faces the slag chamber 100; the slag cooler is cooled by water through the inner casing 13.

In an embodiment, the outer casing 11 and the inner casing 12 cooperate to form a first water inlet chamber 110, and the inner casing 13 and the inner casing inner sleeve 14 cooperate to form a second water inlet chamber 120, a first water inlet chamber 110 and a second inlet chamber. The water chamber 120 is connected through a pipe, and the waste heat recovery unit 1 conducts heat transfer with the slag by using the first water inlet chamber 110 and the second water inlet chamber 120.

In one embodiment, the agitator includes a first slag cooler 21 and a second slag cooler 22, both of which are helically distributed outside the inner casing 13 of the second slag cooler 22, The second slag cooler 22 is located below the first slag cooler 21; the inner side of the outer casing 12 is provided with a slag breaker 23, the interior of the slag breaker 23 is in communication with the first water inlet chamber 110; the second slag trap 22 is provided There is a through hole (not shown), and the second slag cooler 22 is provided with a venting pipe 24 communicating with the air inlet chamber 130, and the waste heat recovery device 1 utilizes the through hole and the air inlet chamber of the second slag cooler 22. 130. The air duct 24 and the air duct 15 form an air passage for convective heat transfer of the slag.

The inner side of the outer casing 12 is provided with a radiant heat exchange tube 33, and both ends of the radiant heat exchange tube 33 are in communication with the inner casing 12 of the outer casing, and the waste heat recovery unit 1 radiates heat to the slag by using the radiant heat exchange tube 33. In this embodiment, the newly added convection heat transfer and radiant heat transfer make the heat exchange efficiency of the slag waste heat utilization device more efficient.

In an embodiment, the first slag trap 21 and the second slag trap 22 are spirally distributed downward in a predetermined direction on the outer side of the inner casing 13, when the inner casing 13, the inner casing inner sleeve 14 and the slag tray 16 rotate. At the same time, the rotation direction is always opposite to the preset direction, so that the first slag trapper 21 and the second slag cooler 22 can produce a better crushing effect on the slag of the slag chamber 100, and at the same time, can generate slag downward. The pressure allows the slag to be more easily squeezed out of the slag chamber 100.

In one embodiment, the volume of the first slag cooler 21 is greater than the volume of the second slag cooler 22, the first slag trap 21 mainly functions as a stirring slag, and the second slag trap 22 and the slag breaker 23 It mainly serves to tear the slag in the molten state, so that the volume of the slag is torn less, which is convenient for sufficient heat exchange.

In an embodiment, the outer casing 12 is of a unitary structure, and the outer casing 12 and the top of the casing 11 are provided with a feeding inlet, and the feeding inlet is provided with a feeding funnel 31 and a heat insulating cover 32, and the heat insulating cover 32 Tighten by T-bolts (not shown). The heat exchange area at the feed port of the present embodiment (ie, the first inlet chamber) compared to the open-type outer casing of the related art waste heat utilization device (for example, Chinese invention patent No. CN201510754750.2) The heat exchange area of 110 is larger, and heat loss is further prevented by adding the heat insulating cover 32, and heat exchange efficiency is improved. In an embodiment, as shown in FIGS. 1 and 4, an in-position sensor 210, a controller 200, and a hydraulic cylinder (not shown) are further disposed at the inlet, when the loading tank with the slag is near At the feed port, the loading tank triggers the in-position sensor 210, and the in-position sensor 210 sends a signal to the controller 200. The controller 200 controls the hydraulic cylinder to travel, pushes the T-bolt to rotate, drives the thermal cover 32 to open, and the loading tank will slag. All of them are poured into the slag chamber 100 and left. The in-position sensor 210 does not detect the loading tank, and the controller 200 controls the hydraulic cylinder to be retracted to cover the heat insulating cover 32.

In one embodiment, the inner casing 13 and the inner casing inner sleeve 14 form a truncated-like structure, and the inner casing 13 and the inner casing inner sleeve 14 are fixed on the slag pan 16 through which the slag pan 16 passes (the bottom of the slag pan 16) The rotation is provided on the support sleeve 81, and the weight 81 is provided in the support sleeve 81. The slag waste heat utilization device further includes a hydraulic solenoid valve 220, and the controller 200 is electrically connected to the hydraulic solenoid valve 220 and the weight sensor 82, respectively. After pouring the slag into the slag chamber 100, the weight sensor 82 transmits a signal of the sudden increase in weight to the controller 200, and the controller 200 receives the signal of the weight sensor 82, starts the mathematical model of the weight reduction method, and controls the hydraulic solenoid valve. The fuel supply amount is increased by 220 to increase the rotation speed of the slag tray 16 and the slag discharge speed, and the controller 200 also controls the opening degree of the circulating water and the air volume to accelerate heat exchange and heat transfer. When the slag is gradually pushed out of the slag chamber 100, when the weight sensor 82 detects the minimum preset weight, the signal is transmitted to the controller 200, and the controller 200 stops the mathematical model operation of the weight reduction method and returns to the normal operation mode. The hydraulic solenoid valve 220 is controlled to reduce the amount of oil supplied so that the rotational speed of the slag pan 16 and the slag tapping speed are slowed down. In summary, the controller 200 adopts a mathematical model of the weight reduction method, and the hydraulic solenoid valve 220 is automatically controlled by the computer, thereby controlling the traveling speed of the hydraulic cylinder, that is, the rotation speed of the slag tray 16 and the slag discharge speed of the slag to further ensure the recovery of waste heat. The production cycle matches.

In one embodiment, the slag waste heat utilization device further includes three casings disposed inside the waste heat recovery unit 1, and the three casings include a first pipe 41, a second pipe 42, and a third pipe 43 in order from the outside to the inside. among them:

The outlet end of the first tube 41 is located in the air inlet chamber 130, and the inlet end of the first tube 41 is connected to the circulation fan 73 (shown in Figures 1 and 2);

The outlet end of the second tube 42 is provided with a water retaining cap and is located in the second water inlet chamber 120, and the inlet end of the second tube 42 is connected to the circulating water pump 63 (shown in FIG. 2);

The inlet end of the third tube 43 is located inside the first top slag 21 of the inner casing 13, and the outlet end of the third tube 43 is in communication with the first inlet chamber 110, the interior of the first slag 21 It is in communication with the second water inlet chamber 120.

Referring to FIG. 2, the slag waste heat utilization device further includes an accumulator 61 and a steam drum 62 connected in parallel and communicating with the top of the outer casing 11, and the accumulator 61 is located above the steam drum 62 so as to be from the first water inlet chamber 110. The soda water mixture first enters the drum 62. After the controller 200 starts the mathematical model of the weight reduction method, the controller 200 controls the inlet valve of the accumulator 61 to open, the outlet valve is closed, and the outlet valve is slightly opened, at which time excess superheated water is stored in the accumulator 61. After the controller 200 stops the mathematical model operation of the weight reduction method, the inlet valve of the accumulator 61 is closed, so that the accumulator water 61 is no longer replenished (ie, the superheated water), and the circulating water pump 63 and the circulation fan 73 are simultaneously provided. Inverter speed reduction, reduce water and gas circulation, ensure that the superheated water temperature and hot air temperature meet the system setting range. In an embodiment, the accumulator 61 and the steam outlet end of the steam drum 62 are provided with a steam flow meter (not shown), and the accumulator 61 and the steam drum 62 are connected to the steam turbine 54 through the superheater 51. When the steam flow meter detects that the steam flow is insufficient, the outlet valve of the large accumulator 61 is automatically opened, and the superheated water stored by the accumulator 61 is flashed to supplement the steam flow, thereby supplementing the steam flow to a normal value and Ensure proper operation of the turbine 54.

Referring to FIG. 3, the superheated steam enters the steam turbine 54, and the generator 55 is driven to generate electricity, and the generated electricity is connected to the steel mill (not connected to the Internet). After the superheated steam releases energy to generate electricity, the low-pressure and low-temperature steam at the outlet of the steam turbine 54 enters the condenser 56, and the steam is cooled by the cooling water pumped from the cooling water tank 58 (not shown) into distilled water, and the heat is exchanged. The cooled cooling water is cooled by the cooling tower 57 and then overflows into the cool water tank 58. The distilled water is sent to the economizer 53 via a condensate pump (not shown) and heated by the hot air to be heated and heated to 108 ° C for deoxidation, and then sent to the inlet of the circulating water pump 63 as a system by a pressurizing pump (not shown). Replenish water.

Referring to FIG. 2, the slag waste heat utilization device further includes a heat exchange device including a superheater 51, an evaporator 52, and an economizer 53 disposed in this order from top to bottom. The water outlet end of the accumulator 61 communicates with the inlet end of the second tube 42 through the circulating water pump 63, and the water outlet end of the drum 62 communicates with the inlet end of the second tube 42 and the first end of the evaporator 52 through the circulating water pump 63. The second end of the evaporator 52 is in communication with the drum 62. The circulating water that has been increased by using the circulating water pump 63 flows into the second water inlet chamber 120 and the first water inlet chamber 110 through the second tube 42 of the three casings, wherein the circulating water pump 63 drives the circulating water into the second water inlet chamber. In the cavity 120, the water flows through the water retaining cap to spread around, fills the entire second water inlet chamber 120, and the water level gradually rises until flowing into the inside of the topmost first slag trap 21 located on the inner casing 13, and flows back into the first Among the three tubes 43, the third tube 43 is in communication with the first inlet chamber 110, and the water gradually fills the entire first inlet chamber 110, the water in the first inlet chamber 110 and the second inlet chamber 120, and the slag chamber 100. The slag together achieves indirect conduction heat transfer. By communicating the first end of the soda-heat exchanger 52 with the circulating water pump 63, the second end of the soda-heat exchanger 52 is in communication with the drum 62, so that the circulating water diverted by the circulating water pump 63 can be heated to superheated water. It is refluxed to the drum 62 to be evaporated into saturated steam.

Referring to FIG. 2, the outlet end of the exhaust pipe 15 is connected with a cyclone 71 and a gravity dust collector 72 in sequence. The air outlet pipe of the gravity dust collector 72 communicates with the top end of the superheater 51, and the bottom end of the economizer 53 is The circulation fan 73 is in communication. The circulating fan 73 blasts the cold air formed by the heat exchange of the heat exchange device into the first tube 41, and the cold air passes through the air inlet chamber 130, the ventilation tube 24, the through hole of the second slag trap 22, and the slag chamber 100. And the exhaust pipe 15, the gradually rising air is sucked out through the exhaust pipe 15, and the hot air enters the cyclone 71 and the gravity precipitator 72 to remove most of the dust particles, and then enters the superheater 51 to superheat the saturated steam generated by the steam drum 62. Then, the evaporator 52 and the economizer 53 are heated to heat the water, and the temperature of the hot air is lowered to enter the inlet of the circulation fan 73, and then bubbled into the waste heat recovery unit 1.

Referring to FIG. 1 , the slag tray 16 is provided with a slag ring 17 in the circumferential direction. The slag ring 17 cooperates with the outer casing 11 to form a slag opening, and the slag opening is filled with water which is arranged to cool the slag. The slag added to the waste heat recovery unit 1 is accompanied by the hydraulic cylinder driving the slag tray 16, the inner casing 13 and the inner casing inner sleeve 14 to rotate together, and transfers heat to the circulating water and the circulating air while being immersed in the second slag trap 22 and the slag. The device 23 is gradually crushed and gradually lowered until all the water falling into the slag outlet is stored, and the waste heat higher than 100 ° C is transferred to the storage water, and the water vapor formed by the heated water is raised to a higher temperature. In the block gap, the heat is further absorbed, and the medium is better than the air heat carrying capacity (that is, the air having a higher moisture content), and then mixed with the warm air after the temperature rise, and is taken out from the exhaust pipe 15 together. The heat is transferred to saturated steam, circulating water and make-up water.

Referring to FIG. 2, the cold-slump block automatically rolled off from the slag tray 16 falls into the discharge chute 91 and falls onto the conveyor belt conveyor 92 at the lower portion of the discharge chute 91, and finally falls into the lifting hopper 93, lifting An electronic weight sensor (not shown) is mounted under the hopper 93. When the lifting hopper 93 is full, the electronic weight sensor activates the lifting hoist 94 to raise the lifting hopper 93 to the position of the dumping dump (ie, the top position of the hoist 94). Stopping, at the same time, stopping the conveyor belt conveyor 92, the scraping block falling into the discharge chute 91 temporarily accumulates in the discharge chute 91, and when the lifting hopper 93 falls to the original position, the controller 200 controls the hoisting machine 94 to stop rotating and transport the belt Machine 92 begins feeding. After the lifting hopper 93 rises and the bucket is dumped, the magnetic separation belt machine 95 runs, and the broken iron pieces in the scrap block are selected and dropped into the scrap steel bin 97, and the remaining scrap blocks fall into the silo 96, when the silo 96 is full. After the material is transported by the transport truck 98.

In this embodiment, the slag is not limited, and may be, for example, a liquid heat carrying object such as an electric arc furnace steelmaking slag, a converter steelmaking slag, a submerged furnace slag, an alloy furnace slag or a pyrometallurgical slag, or a fluidized bed boiler slag. Solid-state heat-carrying objects such as boiling boiler slag, metal magnesium roasting residue or calcined sulfuric acid slag, and solid heat-carrying objects such as sinter or pellets.

The slag waste heat utilization device provided in this embodiment has the following advantages:

1) An air circulation heat exchange system (i.e., a heat exchange mode in which convection heat transfer is added) is added, so that the heat exchange efficiency of the waste heat utilization device of the present embodiment is improved, and superheated steam can also be generated.

2) Increasing the accumulator 61 can effectively adjust the changing waste heat recovery conditions and balance the contradiction between steam production and stable power generation.

3) Introducing the weight loss method mathematical model control mode, hydraulic solenoid valve 220 and inverter, etc., the waste heat recovery power generation system is easy to match the production conditions of the heat carrier.

4) Full-process artificial intelligence control to make the waste heat recovery power generation system safe, efficient, simple, accurate and compact;

5) Increasing the inlet insulation cover 32 and other heat exchange equipment, by thickening the insulation of the pipeline, the heat loss is less, and the residual heat recovery rate is high;

6) The radiant heat exchange tube 33 disposed on the inner side of the inner casing 12 is increased, and the high-temperature radiation heat transfer is fully utilized, so that the heat exchange efficiency is further accelerated.

In this embodiment, a heat exchange mode of convective heat transfer is added to the slag waste heat recovery device, that is, a through hole of the second slag trap 22 and the slag breaker 23 is used, and the air inlet chamber 130, the air duct 24, and the air exhaust duct are used. 15 forming an air passage, thereby further improving the heat exchange efficiency of the slag waste heat utilization device; and the hot air extracted from the exhaust pipe 15 is further repeatedly subjected to dust removal by the cyclone 71 and the gravity dust remover 72, and then passes through the superheater 51 to make the steam The saturated steam of the package 62 is superheated, and the superheated steam is sent to the steam turbine for power generation; the hot air extracted from the exhaust pipe 15 passes through the superheater 51, passes through the evaporator 52 and the economizer 53, and heats the water in the system. The low-temperature hot air after heat exchange between the heater 51, the evaporator 52 and the economizer 53 flows out from the bottom end of the economizer 53 and enters the inlet of the circulation fan 73 to supply cold air to the waste heat recovery unit 1, thereby forming the slag waste heat utilization device. Closed loop heat absorption, heat transfer and heat transfer.

Embodiment 2

FIG. 5 is a flow chart of a method for slag granulation according to an embodiment of the present invention. The molten slag granulation method is carried out by using the slag waste heat utilization device of the first embodiment, and the slag granulation method comprises the following steps:

In S10, the molten slag and the cooled solidified solid block are poured together into a waste heat recovery unit. Wherein, the molten slag can be filled in a gap of the solid block to cool the molten slag, and the molten slag forms a slag having the same volume as that of the solid block:

The waste heat recovery unit may be the waste heat recovery unit 1 in the first embodiment. In other embodiments, the waste heat recovery unit may also be a barrel type device configured to hold molten slag, such as a vertical tube type device.

There is a gap between the solid blocks, the molten slag can penetrate into the gap, and the solid block material can quickly transfer heat, while the solid block material heats up, the molten slag cools down until solidified, forming the same or similar gap with the solid block. Slag block.

In S20, air is introduced into the waste heat recovery device to absorb heat, so that the slag block is gradually broken into particle slag. In one embodiment, air is introduced into the waste heat recovery unit from top to bottom.

In one embodiment, the cold air is passed into the waste heat recovery device, and the air penetrates into the gap of the solid block to further convectively exchange heat with the slag block, further reducing the temperature of the slag block, and causing the slag block to gradually expand and become Particle slag.

In an embodiment, in order to ensure that the temperature in the waste heat recovery device is different (that is, the slag formed by the molten slag and the solid slag which is the same as the solid slag and the solid slag which is placed in the waste heat recovery device in advance) Sufficiently, by using a stirring device provided in the waste heat recovery device, the molten slag, the solid block, the slag block, and the solid slag placed in the waste heat recovery device in advance are continuously stirred until the molten slag becomes a slag block and then all It becomes granular residue.

In one embodiment, the molten slag granulation method further comprises indirectly water cooling the waste heat recovery device to cause the molten slag to rapidly solidify to form a slag having cracks, and the cold air can enter the crack of the slag block. The molten slag and the solid block are poured into the slag chamber 100, and the water is introduced into the first inlet chamber 110 and the second inlet chamber 120 to indirectly water-cool the molten slag in the slag chamber 100. The molten slag is rapidly solidified, cooled and shrunk. During the crystal transformation of a large amount of solidified slag to form dicalcium silicate, the volume of the solidified slag expands to form an internal stress against the contraction force during cooling. The faster the cooling rate, the greater the internal stress. The internal stress causes the solidified slag to burst and form a crack to form a granule.

In one embodiment, prior to S10, a quantity of cooled solidified solid slag is placed in the waste heat recovery unit. When the higher temperature molten slag is poured into the waste heat recovery device containing the solidified slag solidified by cooling, the molten slag can be infiltrated into the gap between the solid slag blocks, and the solid slag block can be quickly transferred to heat, thereby solid The slag is heated and the molten slag is cooled. In addition, the solid slag placed in the waste heat recovery device in advance can also prevent the molten slag from directly flowing into the bottom of the waste heat recovery device, and extend the molten slag separately from the solid block, the cold air, the first water inlet chamber 110 and the second The heat exchange time between the inlet chambers 120.

In summary, in this embodiment, the solidified solid block and the molten slag are simultaneously poured into the waste heat recovery device to cool the first heat exchange of the molten slag; after entering the waste heat recovery device, the waste heat recovery device is placed in advance. The solid slag is contacted, and the second heat exchange is cooled; and the water in the first water inlet 110 and the second water inlet 120 of the waste heat recovery device is used to cool the third indirect heat exchange of the molten slag; The cold air is introduced into the device, so that the air enters the crack of the slag block and the slag granule gap, and the slag block is subjected to the fourth heat exchange to cool down; finally, the slag block with different temperature in the waste heat recovery device is continuously stirred to make the waste heat recovery device The slag block inside heat exchange is more sufficient until the slag block in the waste heat recovery unit becomes all particulate slag.

In an embodiment, a temperature sensor is disposed at the bottom of the waste heat recovery device, and when the temperature sensor monitors that the temperature of the bottom of the waste heat recovery device is lowered to a preset temperature (it is considered that the slag block at the bottom of the waste heat recovery device has all become particle slag) The particulate slag and solid block falling into the bottom of the waste heat recovery device are removed from the waste heat recovery device, and the solid particles at the bottom of the waste heat recovery device are continuously removed, and the free space at the top of the waste heat recovery device is inevitably gradually increased to achieve continuous melting. The slag is granulated, and at the same time, the same amount of molten slag and solid block of the particulate slag and the solid block which are removed from the waste heat recovery device are continuously added to the waste heat recovery device.

In one embodiment, the particle slag and the solid block of the waste heat recovery device are sieved; after sieving, the particle slag and the solid block having a particle diameter larger than a predetermined particle diameter are separated, and the separated particle slag is separated. And the solid block continues to be poured into the waste heat recovery device for continuous granulation; and the particle slag having a particle size smaller than the predetermined particle size is shipped to the customer market for engineering applications. Among them, the preset particle size is 3 cm.

Claims

A slag waste heat utilization device, comprising a waste heat recovery device (1); wherein the waste heat recovery device (1) comprises: an outer casing (11), an outer casing inner casing (12) and an inner casing (13) arranged in order from the outside to the inside. ) and inner casing inner sleeve (14);

An exhaust pipe (15) is disposed between the outer casing (11) and the outer casing (12);

a slag tray (16) fixed to the bottom of the inner casing (13) and the inner casing inner casing (14), and the inner casing (13), the inner casing inner casing (14) and the The slag trays (16) are each disposed to rotate relative to the outer casing (11) and the inner casing (12), and the inner casing inner casing (14) cooperates with the slag pan (16) to form an air inlet chamber ( 130), the outer casing (12), the inner casing (13) and the slag disc (16) cooperate to form a slag chamber (100), and the air inlet end of the air duct (15) faces Slag chamber (100);

a slag trap, the slag cooler being outside the inner casing (13); and

a ventilation tube (24), the ventilation tube (24) being in communication with the air inlet chamber (130).
The slag waste heat utilization device according to claim 1, wherein the waste heat recovery device (1) further comprises a first water inlet chamber (110) and a second water inlet chamber (120), and the first water inlet chamber (110) Provided to be formed by the outer casing (11) and the inner casing (12), the second water inlet chamber (120) is disposed by the inner casing (13) and the inner casing inner casing (14) The first water inlet chamber (110) and the second water inlet chamber (120) are in communication.
A slag waste heat utilization apparatus according to claim 2, wherein said slag cooler comprises a first slag trap (21) and a second slag trap (22), said second slag trap (22) being located Below the first slag cooler (21), the second slag cooler (22) is provided with a through hole, and the vent pipe (24) is disposed in the second slag trap (22).
The slag waste heat utilization apparatus according to claim 3, wherein the first slag cooler (21) and the second slag cooler (22) are disposed to be spirally distributed outside the inner casing (13).
A slag waste heat utilization apparatus according to claim 4, wherein said waste heat recovery unit (1) further comprises a slag breaker (23), said slag breaker (23) being disposed in said outer casing (12) On the inner side, the interior of the breaker (23) is in communication with the first inlet chamber (110).
The slag waste heat utilization device according to claim 5, wherein the outer casing (12) is of a unitary structure, and the outer casing (12) and the top of the outer casing (11) are provided with a feed. The waste heat recovery unit (1) further includes a feed funnel (31) and a heat retention cover (32) disposed at the feed port.
The slag waste heat utilization device according to claim 5, wherein the waste heat recovery device (1) further comprises a radiant heat exchange tube (33) disposed inside the outer casing inner casing (12), the radiation heat exchange Both ends of the tube (33) are in communication with the outer casing (12).
The slag waste heat utilization device according to claim 5, wherein an inside of the first slag cooler (21) is in communication with the second water inlet chamber (120), and the first slag trap (21) The volume is greater than the volume of the second slag cooler (22).
The slag waste heat utilization device according to claim 8, wherein the waste heat recovery device (1) further comprises a circulating water pump (63) and three casings disposed inside the waste heat recovery device (1), the three sets The tube comprises, in order from the outside to the inside, a first tube (41), a second tube (42) and a third tube (43); wherein

An outlet end of the first tube (41) is located in the air inlet chamber (130), and an inlet end of the first tube (41) is connected to a circulation fan (73);

The waste heat recovery device (1) further includes a water retaining cap disposed at an outlet end of the second tube (42) and located in the second water inlet chamber (120), the second An inlet end of the tube (42) is connected to the circulating water pump (63);

An inlet end of the third tube (43) is located inside the first slag trap (21) at the top end of the inner casing (13), and an outlet end of the third tube (43) is opposite to the first The inlet chamber (110) is in communication.
The slag waste heat utilization apparatus according to claim 9, further comprising heat exchange equipment including a superheater (51), an evaporator (52), and an economizer (53) disposed in this order from top to bottom.
A slag waste heat utilization apparatus according to claim 10, further comprising an accumulator (61), a steam drum (62) and a steam turbine (54), said accumulator (61) and said steam drum (62) being connected in parallel The accumulator (61) and the steam drum (62) are both in communication with the top of the outer casing (11); the accumulator (61) and the steam outlet end of the steam drum (62) pass the A superheater (51) is coupled to the steam turbine (54), and a water outlet end of the steam drum (62) passes through an inlet end of the circulating water pump (63) and the second pipe (42) and the evaporator (52) The first end of the evaporator is in communication with the second end of the evaporator (52) in communication with the drum (62).
The slag waste heat utilization device according to claim 10, further comprising a cyclone (71) and a gravity dust remover (72), wherein an outlet end of the exhaust pipe (15) is sequentially connected to the cyclone (71) And the gravity dust collector (72), an air outlet pipe of the gravity dust remover (72) is in communication with a top end of the superheater (51), a bottom end of the economizer (53) and the circulating fan (73) Connected.
The slag waste heat utilization device according to claim 5, further comprising a controller (200) and a hydraulic solenoid valve (220), the waste heat recovery device (1) further comprising a support sleeve (81) and a weight sensor (82), The slag tray (16) is disposed on the support sleeve (81) by bearing rotation, the weight sensor (82) is disposed in the support sleeve (81), and the controller (200) is respectively The hydraulic solenoid valve (220) and the weight sensor (82) are electrically connected.
The slag waste heat utilization device according to any one of claims 1 to 13, wherein the waste heat recovery device (1) further comprises a slag ring (17) in which the slag ring (17) is located (16) In the circumferential direction, the slag ring (17) cooperates with the outer casing (11) to form a slag opening, and the slag opening is provided to fill the water for cooling the slag.
A molten slag granulation method, which is carried out by using the slag waste heat utilization device according to any one of claims 1 to 14, the slag granulation method comprising:

Pour molten slag and cooled solidified solid block together into the waste heat recovery device, so that the molten slag is filled in a gap between the solid blocks, thereby cooling the molten slag, and The molten slag forms a slag block; and

Air is introduced into the waste heat recovery device from top to bottom to absorb heat, and the slag is gradually broken into particulate slag.
The molten slag granulation method according to claim 15, further comprising: water cooling the waste heat recovery device to indirectly water-cool the molten slag before the heat is introduced into the waste heat recovery unit; .
The molten slag granulation method according to claim 16, wherein the slag chamber is provided to accommodate the molten slag and the solid block, and the first inlet chamber and the second inlet chamber are disposed In order to pour the molten slag and the solid block into the slag cavity, and after the water is introduced into the first water inlet chamber and the second water inlet chamber, respectively, The molten slag in the chamber is indirectly water cooled.
The molten slag granulation method according to claim 17, wherein before the pouring of the molten slag and the solid block together into the waste heat recovery device, further comprising placing a solid in the waste heat recovery device a slag block, wherein the solid slag block is for preventing the molten slag from flowing directly to the bottom of the waste heat recovery device, and extending the molten slag and the solid block, the cold air, the first The heat exchange time between the inlet chamber and the second inlet chamber.
The slag granulation method according to claim 18, wherein said introducing heat into said waste heat recovery unit to absorb heat to gradually rupture said slag into particulate slag comprises: to said waste heat recovery device The molten slag, the solid block, the slag and the solid slag are continuously stirred until the slag forms a slag, and the slag is further formed into particulate slag.
The molten slag granulation method according to claim 19, wherein said introducing air into said waste heat recovery unit to absorb heat to gradually break said slag into particulate slag further comprises: monitoring bottom of waste heat recovery device a temperature, when the temperature of the bottom of the waste heat recovery device is lowered to a preset temperature, the particulate slag and the solid block falling into the bottom of the waste heat recovery device are removed from the waste heat recovery device while being the residual heat The same amount of molten slag and solid block as the particulate slag and the solid lumps of the waste heat recovery unit are continuously added to the recycler.
The slag granulation method according to claim 20, wherein after the particulate slag and the solid lumps which are to fall into the bottom of the waste heat recovery device are removed from the waste heat recovery device, Separating the particle slag of the waste heat recovery device and the solid block; after sieving, separating the particle slag and the solid block having a particle diameter larger than a predetermined particle size; and separating the The particulate slag and the solid block continue to be poured into the waste heat recovery unit for continuous granulation.