Recuperative waste heat recovery system and method for hot solid slag particles

Abstract

The present invention discloses a recuperative waste heat recovery system for high-temperature solid slag particles, the system comprising: a granulation device (11), which is preferably a gas-quench granulation device, a gas-water granulation device, or a rotating cup granulation device; a recuperative heat exchanger (12), which has a slag particle inlet (1213) corresponding to the slag outlet (1112) of the granulation device (11), a slag particle outlet (1214), and a heat exchange tube set (123) disposed inside the recuperative heat exchanger (12), the heat exchange tube set (123) having a cooling medium inlet (1211) and a cooling medium outlet (1212), the cooling medium being preferably water; and a waste heat recovery facility, wherein the cooling medium inlet (1211) and the cooling medium outlet (1212) are each connected to the waste heat recovery facility via a pipeline. The waste heat recovery equipment does not use an intermediate heat transfer medium and has the advantages of high heat exchange efficiency and high heat recovery efficiency.

Description

[Technical Field]

[0001] The present invention relates to waste heat recovery technology, and more particularly to a recuperative waste heat recovery system and method for high temperature solid slag particles. [Background technology]

[0002] background In the context of modern social progress, the iron and steel industry is a key industry in China, ensuring economic development and the construction of basic livelihoods. However, it is also a major contributor to energy consumption and pollutant emissions. After research, it was found that waste heat resources in steel production account for 60% of the total energy consumption of steel production, and are mainly accumulated in products, blast furnace slag, waste, and steelmaking slag. In China, the tapping temperature of blast furnace slag is 1400-1550°C, and the slag is (1260-1880) x 10 per ton. 6 J of sensible heat, which is equivalent to the calorific value of 60 kg of standard coal. After granulation, its temperature remains at least 200-900°C, preferably 300-800°C. Therefore, research and development of high-temperature slag waste heat recovery technology is of great significance for energy conservation and emission reduction in the steelmaking industry.

[0003] The heat exchange process of high-temperature slag waste heat recovery technology mainly includes the granulation of high-temperature molten slag and the post-granulation waste heat recovery process of high-temperature slag particles, as well as the treatment of a cooling medium after heat recovery. Methods for recovering waste heat from high-temperature slag particles include direct contact heat exchange between gas and solid, direct contact heat exchange between liquid and solid, and indirect contact heat exchange. Cooling media include water and air. However, research and development into large-volume slag processing has been insufficient, and the problem of thermal energy waste still exists. Summary of the Invention

[0004] overview In view of the above technical problems, the object of the present invention is to propose a recuperative waste heat recovery system for high-temperature solid slag particles, and its heat transfer process includes: direct contact heat exchange between air and slag particles, and indirect contact heat exchange between water / steam and slag particles, thereby improving the heat recovery efficiency of high-temperature solid slag particles.

[0005] To achieve the above objectives, the technical solutions of the present invention are as follows: 1. A recuperative waste heat recovery system for hot solid slag particles, the recuperative waste heat recovery system comprising: having a granulation device, which is preferably a gas-quench granulation device, a gas-water granulation device or a rotating cup granulation device; a rolling recuperative heat exchanger having a slag particle inlet corresponding to the slag outlet of the granulation device, a slag particle outlet, and a heat exchange tube set disposed within the recuperative heat exchanger, the heat exchange tube set having a cooling medium inlet and a cooling medium outlet, the cooling medium being preferably water; and a waste heat recovery facility, and the cooling medium inlet and the cooling medium outlet are each connected to the waste heat recovery facility via a pipeline; Recuperative waste heat recovery system.

[0006] The waste heat recovery facility is used to store the heat recovered from the hot slag particles and to further utilize it according to subsequent settings.

[0007] Preferably, the waste heat recovery system comprises: a steam drum having a steam drum water inlet, a steam drum water outlet, a saturated steam outlet, and a steam-water mixture inlet; Has a water tank; The steam drum water inlet is connected to the water tank, the coolant inlet is connected to the steam drum water outlet, and the coolant outlet is connected to the steam-water mixture inlet.

[0008] The pipeline system separates saturated water and saturated steam in the steam drum, and the saturated steam (about 180°C) can then be used by downstream users to provide heat for buildings or low-pressure boilers. A water tank is used to replenish the steam drum with water so that the water level in the steam drum remains constant after the steam is discharged.

[0009] Preferably, the recuperative waste heat recovery system for high-temperature solid slag particles further includes a conveyor and a dust collector disposed below the slag particle outlet, the inlet end of the dust collector being connected to the air outlet of the recuperative heat exchanger via a pipeline, and the outlet of the dust collector being connected to the waste heat recovery facility via a pipeline.

[0010] After the slag particles exchange heat with the heat exchange tube set, the additional heat of the slag particles can be further diffused to the waste heat recovery equipment through the pipeline. Preferably, the heat exchanger has a cylinder, with a slag particle inlet and a slag particle outlet set at the top and bottom of the cylinder, respectively, an air outlet arranged at the top of one side wall of the cylinder, and an air inlet pipeline and a fan arranged at the bottom of the other side wall; preferably, a guide plate for guiding the uniform flow of the slag particles is arranged at the top of the cylinder; preferably, an air distribution device is arranged at the bottom of the cylinder.

[0011] The air distribution system can accelerate the diffusion of slag particle heat through the pipeline and accelerate the heat transfer process to the waste heat recovery system.

[0012] Preferably, the heat exchanger has a cylinder with a metal shell-and-tube structure, and the slag particle inlet and slag particle outlet are respectively arranged on the side wall of the cylinder on the cooling medium outlet side and the side wall of the cylinder on the cooling medium inlet side, a spiral plate with interconnected through holes is arranged inside the cylinder, and heat exchange tubes are inserted into the through holes; preferably, the outer shell of the cylinder adopts a water-cooled wall structure, and has a cylinder heat exchange tube sleeve, a core-shaft heat exchange tube, a spiral plate arranged inside the cylinder, and a heat exchange tube set passing through the spiral plate.

[0013] By employing a spiral plate heat exchange device similar to a rolling bed, rapid cooling (over 20°C / min) of hot slag particles can be achieved while generating saturated steam.

[0014] Preferably, the heat exchanger has a metal shell-and-tube structure, and its internal structure is vertically divided from top to bottom into a superheating section and an evaporating section. A first set of heat exchange tubes and a second set of heat exchange tubes are arranged in the superheating section and the evaporating section, respectively. The inlet end of the first set of heat exchange tubes is connected to the saturated steam outlet of the steam drum, and the outlet end of the first set of heat exchange tubes is connected to the steam pipe network via a pipeline through a buffer tank. The inlet end of the second set of heat exchange tubes is connected to the saturated water outlet of the steam drum, and the outlet end of the second set of heat exchange tubes is connected to the saturated steam-water mixture inlet of the steam drum. The heat exchanger is provided with guide plates arranged vertically spaced apart and a material distribution chute arranged below the slag material inlet, and the guide plates are arranged with through holes for the heat exchange tubes to pass through.

[0015] The guide plate provides effective support for the heat exchange tube set and prevents deflected flow of slag particles, ensuring uniform and consistent flow in all areas. The material distribution chute can rotate 360 ​​degrees and tilt up and down within a range of 0 to 90 degrees (0 degrees indicates horizontal position and 90 degrees indicates vertical position). When distributing material, the chute can rotate and tilt to distribute the hot slag particles uniformly.

[0016] Preferably, the recuperative waste heat recovery system for high-temperature solid slag particles further comprises a disturbing rod inserted between the first heat exchange tube and the second heat exchange tube in the heat exchanger, one end of the disturbing rod being fixed to the fixed base and the other end of the disturbing rod extending outside the heat exchanger; the disturbing arms are arranged on the rod body at axial intervals, and the axes of the disturbing arms and the axis of the disturbing rod form an angle; preferably, adjacent disturbing arms are arranged in an antisymmetric manner; It has a drive device, the output end of which is connected to the end of the disturbance rod that extends outside the heat exchanger.

[0017] The action of the disturbing rod and its disturbing arms can prevent clogging of slag particles between the heat exchange tubes.

[0018] Preferably, the drive device is of the worm and worm wheel type, the worm wheel being coaxially connected to the end of the disturbing rod.

[0019] Preferably, the recuperative waste heat recovery system for high-temperature solid slag particles further includes at least one high-temperature storage tank disposed between the granulation device and the recuperative heat exchanger, with an inlet connected to the slag outlet of the granulation device at the top of the high-temperature storage tank and an outlet connected to the slag particle inlet of the heat exchanger at the bottom of the high-temperature storage tank; the lower part of one side wall of the high-temperature storage tank is equipped with an air inlet, an air inlet pipeline and a fan, while the upper part of the opposite side wall is equipped with an air outlet connected to the inlet end of the dust collector via a pipeline, and the outlet of the dust collector is connected to the waste heat recovery equipment via a pipeline; preferably, a temperature detection device is installed in the pipeline connected to the dust collector; preferably, an air distribution equipment connected to the air inlet pipeline is installed at the bottom of the high-temperature storage tank; more preferably, a filter screen, a heat insulating material and an outer shell are arranged from the inside to the outside of the side wall of the high-temperature storage tank.

[0020] The hot storage tank acts as a link between the molten slag granulation and the slag-particle heat exchange, facilitating the efficient management of the molten slag produced at different power levels and allowing flexible control of the recuperative heat exchanger.

[0021] In order to prevent the hot solid slag particles in the high temperature storage tank from agglomerating, it is necessary to cool the slag particles in the high temperature storage tank. The power of the fan can be controlled through a temperature detection device. The hot air going out from the high temperature storage tank is sent to the waste heat recovery equipment after being removed by the dust collector, and then goes through the fan to the air purifier for purification, and is discharged after meeting the emission standard.

[0022] Preferably, the waste heat recovery equipment further comprises a superheater and / or an evaporator, the inlet of the superheater is connected to the saturated steam outlet of the steam drum, and the outlet of the superheater is connected to a steam pipeline network; the inlet of the evaporator is connected to a water tank, and the outlet of the evaporator is connected to the steam drum water inlet.

[0023] The superheater may further heat the saturated steam output from the steam drum and convert it to superheated steam (approximately 220°C) for use in a steam pipeline network, such as in a power plant. The heat source for converting the saturated steam to superheated steam may come from the high-temperature storage tank or hot air blown out by the air distribution system of the heat exchanger. At the same time, after heating the saturated steam to superheated steam, the heat source may further preheat water from a water tank in the evaporator. The preheated water from the evaporator then enters the steam drum. Preferably, the hot air first passes through the superheater and then through the evaporator, in this order, to maximize the use of heat for converting the saturated steam to superheated steam.

[0024] Preferably, the superheater and the evaporator are disposed in a sealed container, and an air inlet is disposed in the sealed container and connected to the outlet of the dust collector via a pipeline; the outlet of the sealed container is connected to the air purifier via a pipeline and a fan; preferably, the evaporator and the superheater adopt a coil structure; preferably, a water treatment device is further included between the evaporator and the water tank.

[0025] This water treatment device is used for deoxygenating and desalination of water.

[0026] Preferably, the gas-quench granulation device comprises: A granulation chamber having a box structure, a molten slag inlet disposed at the top of the granulation chamber, and a molten slag chute disposed above the molten slag inlet; a slag particle outlet disposed at the bottom of the granulation chamber; The granulation chamber has a high-pressure nozzle arranged on a side wall thereof, the outlet of which faces the molten slag inlet, and an air outlet, a dust collector and a fan arranged on the upper part of the other side wall of the granulation chamber; preferably, the high-pressure nozzle is a Laval nozzle.

[0027] Impacting and granulating with high pressure air is a type of dry granulation and does not produce waste water or polluting gases.

[0028] Preferably, the gas-water granulation device comprises: A granulation chamber having a box structure, a molten slag inlet disposed at the top of the granulation chamber, and a molten slag chute disposed above the molten slag inlet; a slag particle outlet disposed at the bottom of the granulation chamber; The granulation chamber has a side wall with a high-pressure nozzle, the outlet of which faces the molten slag inlet, and a gas-water outlet, a filter, a gas-water separator and a fan arranged at the top of the other side wall of the granulation chamber, and the high-pressure nozzle is an atomizing nozzle or a gas-liquid two-fluid nozzle.

[0029] The ratio of the gas-water mixture can be controlled by the compressed air flow control valve and the water flow control valve.

[0030] Preferably, the rotating cup granulation device comprises: The granulation chamber has a box structure, and a molten slag inlet is arranged at the top of the granulation chamber, and a molten slag particle outlet is arranged at the bottom of the granulation chamber. An air inlet, an air inlet pipeline, and a fan are arranged at the bottom of one side wall of the granulation chamber. An air outlet, an air outlet pipeline, a dust collector, and a fan are arranged at the top of the other side wall of the granulation chamber. having a rotation motor located at the center of the granulation chamber; A rotary motor has a rotary cup disposed at the output end thereof.

[0031] Preferably, the heat exchanger comprises: The drum cylinder has a slag particle inlet disposed near the cooling medium outlet on a side wall of the drum cylinder, and a slag particle outlet disposed near the cooling medium inlet on a side wall of the drum cylinder; the drum cylinder is installed with an inclination downward toward the cooling medium outlet side, allowing the slag particles to move from the slag particle inlet to the slag particle outlet; preferably, the drum cylinder comprises an inner cylinder, an outer cylinder, and a thermal insulator disposed between the inner cylinder and the outer cylinder; a plurality of lifting plates disposed at intervals on the inner wall of the drum cylinder along a circumferential direction of the inner wall of the drum cylinder, the lifting plates being L-shaped; a cylinder drive device having gearing, a drive motor, and a support structure disposed outside the drum cylinder, the cylinder drive device being used to rotate the drum cylinder; and The heat exchange tube set is disposed at the center of the drum cylinder, on the inner wall of the drum cylinder, and inside the lifting plate.

[0032] The main function of the lifting plate is to scatter the hot slag particles. The length and installation angle of the lifting plate are determined based on the flow rate of the hot slag particles to be processed.

[0033] Preferably, the heat exchange tube set comprises an A-type heat exchange tube set and a B-type heat exchange tube set, and the A-type heat exchange tube set has a plurality of fins arranged vertically in the circumferential direction on the outer wall thereof to form a finned tube, the A-type heat exchange tube set is arranged at the center of the drum cylinder, and the fins are preferably ring ribs, column ribs or plate ribs; and the B-type heat exchange tube set is arranged on the lifting plate or the inner wall of the drum cylinder.

[0034] When the lifting plate scatters the hot slag particles, the B-type heat exchange tube cools the hot slag particles inside the lifting plate. The outside of the A-type heat exchange tube is welded with fins (ring ribs, column ribs, plate ribs, etc.) to improve the heat exchange between the hot slag particles and the tube wall; preferably, ring rib fins are adopted to improve the heat exchange.

[0035] The hot slag particles are scattered by the lifting plate in the drum cylinder and simultaneously exchange heat with the lifting plate and the heat exchange tubes on the drum wall. The scattered hot slag particles come into contact with the finned heat exchange tubes in the center of the drum and are thereby cooled. The drum cylinder is installed at an angle, so the hot slag particles gradually move toward the drum outlet during the rolling process while completing the heat exchange.

[0036] Preferably, the heat exchange tube set is arranged in the drum cylinder by employing multiple tube passes, and the number of tube passes is odd; preferably, the flow resistance of each heat exchange tube is consistent to ensure that the cooling medium does not experience flow misalignment.

[0037] Preferably, the recuperative waste heat recovery system for hot solid slag particles further comprises: A buffer tank drum is provided, the buffer tank drum having an inlet and an inlet pipeline on one side of its side wall, and a discharge outlet and a discharge pipeline on the other side; the buffer tank drum is installed with an inclination toward the discharge outlet side, ensuring that the slag particles move from the inlet end to the discharge end inside the cylinder; having first material lifting plates, the first material lifting plates being spaced apart vertically in a circumferential direction along the inner wall of the buffer tank drum and being L-shaped; A first drive device is included, the first drive device having gearing, a first drive motor and a corresponding support structure disposed on an outer wall of the buffer tank drum.

[0038] Preferably, the heat exchanger comprises: a horizontally disposed drum cylinder, the end of which is disposed with a feeding device having a slag particle inlet and a discharge device having a slag particle outlet; a material-guiding spiral plate disposed inside the drum cylinder, which has through holes for the heat exchange tube set to pass through; a support roller device, the support roller device being disposed at the bottom of the cylinder near the discharge device end of the cylinder and matching with the outer ring surface of the drum cylinder; the support roller device being disposed at the bottom of the cylinder and matching with the outer ring surface of the drum cylinder and used to support the drum cylinder; a holding roller device disposed at the bottom of the cylinder near the feeding device end of the cylinder and matching the side of the drum cylinder; the holding roller device is used to stabilize the drum cylinder when it is installed at an angle, ensuring stable rolling; a transmission device disposed on the support roller device; the drum cylinder is supported by the support roller device and the holding roller device and can be driven by the transmission device to perform continuous rotational motion; The heat exchange tube sets are uniformly arranged inside the drum cylinder.

[0039] It takes about 40 minutes for the slag particles to travel from the inlet end to the discharge end of the heat exchanger and the temperature drops from 750°C to below 200°C.

[0040] Preferably, the high-temperature solid slag particle recuperative waste heat recovery system satisfies one or more of the following requirements: The cylinder is composed of three sections, which are made of heat-resistant stainless steel, stainless steel and alloy steel, respectively, forming a high-temperature section, a medium-temperature section and a low-temperature section; The transmission device comprises a main transmission system and an auxiliary transmission system which are mutually self-locking, and the main motor of the main transmission system adopts a variable frequency speed regulating motor; The length of the material-guiding spiral plate extending beyond the cylinder is 100 to 200 mm.

[0041] The cylinder of the drum cylinder consists of three sections, which are made of heat-resistant stainless steel, stainless steel and alloy steel respectively, and the cylinder is divided into a high-temperature section (750°C-550°C), a medium-temperature section (550°C-350°C) and a low-temperature section (below 350°C); it can meet the temperature change demand of the heat exchanger section, from 750°C to below 200°C, and the manufacturing cost can be reduced by using different materials.

[0042] The transmission device consists of a main transmission system and an auxiliary transmission system that are mutually self-locking (when the main transmission system is operating, the auxiliary transmission system cannot operate, and vice versa), and the main motor of the main transmission system adopts a variable frequency speed regulating motor to adjust the rotation speed of the drum cylinder according to the operating requirements of the heat exchanger. When the drum cylinder is undergoing maintenance or the main motor is powered off, the auxiliary transmission system is activated.

[0043] Preferably, the heat exchanger comprises: a heat exchanger cylinder having a feed box with a slag particle inlet and a discharge box with a slag particle outlet at its ends, the ends of the heat exchanger cylinder near the discharge box and the feed box being respectively arranged with a water header and a steam-water header; The heat exchanger has twin support-holding roller devices arranged on both sides of the cylinder; a heat exchanger cylinder having a rotary drive device disposed at the bottom of the central portion of the cylinder; The steam drum and the heat exchanger form a closed circulation system; The waste heat recovery equipment includes a superheater, the superheater including, from top to bottom, a preheating module, a superheating module, and a combustion module; the steam drum is connected to the preheating module via a water inlet pipe and to the superheating module via a steam outlet pipe; A blowdown pipe and an emergency water discharge pipe are arranged at the bottom of the steam drum, and the blowdown pipe and the emergency water discharge pipe are connected to the blowdown expansion vessel; A regulating valve (preferably an electric regulating valve) is arranged in the inlet pipeline of the water tank, and the outlet pipeline of the water tank is connected to the inlet of the water supply pump, and the outlet pipeline of the water supply pump is connected to the inlet of the superheater; preferably, the water tank is equipped with a level gauge.

[0044] Preferably, the heat exchanger satisfies one or more of the following criteria: A continuous spiral support tube sheet is welded to the inner wall of the heat exchanger cylinder, and the continuous spiral support tube sheet is spirally distributed along the axial direction inside the heat exchanger cylinder; the spiral support tube sheet has corresponding through-holes, and heat exchange tube sets are inserted into the through-holes of the spiral support tube sheet; both ends of the heat exchanger cylinder are equipped with flange tube sheets, and the ends of the heat exchange tubes are fixed to the two flange tube sheets, which are fixedly connected to a steam-water header and a water header, respectively. One end of the heat exchange tube is connected to the water header, and the other end of the heat exchange tube is connected to the steam-water header. The water header is rotatably connected to the water inlet rotary joint, and the steam-water header is rotatably connected to the steam outlet rotary joint, with graphite material used for sealing the rotary joints. The steam-water header and water header rotate together with the heat exchanger cylinder.

[0045] The heat exchanger cylinder has an inner cylinder wall and an outer cylinder wall, the inner cylinder wall and the heat exchange tubes form a heat exchange space, and a heat insulating material is filled between the inner cylinder wall and the outer cylinder wall. End plates are arranged on the inner and outer cylinder walls and ends, and a discharge scraper is circumferentially welded between the end plate and the flange tube sheet on the discharge side.

[0046] Preferably, the superheater comprises, in order from top to bottom, a preheating module, a superheating module and a combustion module; The combustion module includes a furnace, a burner, a flue gas circulation pipeline, and a circulation fan; the superheat module having a steam inlet, a steam inlet header, a steam outlet header, a steam outlet, and a superheater tube set; The steam inlet of the superheating module is connected to the steam outlet pipeline of the steam drum, and the saturated steam in the steam drum is transported into the steam inlet header through the steam inlet of the superheating module, and the saturated steam is uniformly distributed to the superheating tube set by the steam inlet header; The preheating module has a water inlet, a water inlet header, a water outlet header, a water outlet, and a preheating tube set; the outlet pipeline of the water supply pump is connected to the water inlet, and the cold water from the water tank is transported into the water inlet header through the water inlet, and the cold water is evenly distributed to the preheating tube set by the water inlet header; the flue gas after heat exchange in the superheating module flows upward through the preheating module, heats the cold water in the preheating tube set, and is collected by the water outlet header on the preheating module. After that, the water outlet on the water outlet header is connected to the water inlet pipe of the steam drum, and the hot water is transported into the steam drum.

[0047] The present invention provides a recuperative waste heat recovery method for high temperature solid slag particles, the method comprising the steps of: a) introducing molten slag into a granulation device for molten slag granulation to obtain slag particles, and air performs contact heat exchange with the molten slag during the molten slag granulation process, and is discharged through a dust collector and a fan; preferably, the molten slag granulation is performed by gas-quenching granulation, gas-water granulation or rotating cup granulation; b) introducing the slag particles into a recuperative heat exchanger, wherein the slag particles perform indirect contact heat exchange with water or steam from the steam drum via a heat exchange tube set, and the water or steam absorbs heat and is then returned to the steam drum and / or the superheater and evaporator; c) A step of sending out the heat-exchanged slag particles via a conveyor.

[0048] Preferably, in step b), the slag particles fall uniformly under the action of the guide plate of the recuperative heat exchanger, and during the falling process, they exchange heat with the air blown out from the air distribution equipment located below the recuperative heat exchanger.

[0049] Preferably, in step b), the slag particles undergo indirect contact heat exchange with water or steam from the steam drum via the heat exchange tube set and / or the cylinder heat exchange tube sleeve and / or the core-shaft heat exchange tube, and the heat-exchanged slag particles are pushed down to the conveyor by the spiral plate and discharged via the conveyor.

[0050] Preferably, in step b), saturated water from the steam drum enters the second heat exchange tube in the evaporation section of the recuperative heat exchanger, and after heat exchange with the high-temperature slag particles, it becomes a saturated water-steam mixture, which is then returned to the steam drum via the pipeline to achieve separation of steam and water; the saturated steam in the steam drum flows into the first heat exchange tube in the superheating section of the recuperative heat exchanger under pressure difference, and after heat exchange with the slag particles, it forms superheated steam, which is then connected to the steam pipe network via the buffer tank via the pipeline; preferably, when the slag flow rate is less than a set value, the steam pipeline in the superheating section is closed.

[0051] Preferably, before step b), the slag particles first enter a high-temperature storage tank for temporary storage, and then enter a recuperative heat exchanger; during the temporary storage of the slag particles in the high-temperature storage tank, the hot air generated in the high-temperature storage tank is filtered by a dust collector and then sent to a waste heat recovery equipment for heat exchange; preferably, multiple high-temperature storage tanks are adopted and arranged in parallel.

[0052] The advantages of the present invention are: 1. The present invention enables large-scale high-temperature slag particle waste heat recovery, and the heat recovery medium used is mainly water. During water evaporation, a large amount of latent heat is absorbed, and the convective heat exchange coefficient and boiling heat exchange coefficient between the water and the metal tube wall are very high (heat flux density is 10 5 W / m 2 (of the order of magnitude), improving the efficiency of waste heat recovery. 2. The present invention avoids the heat loss of the intermediate heat transfer medium through direct heat exchange between the hot slag particles, the heat exchange tube set and the cooling medium (water). The flow and heat exchange of the hot slag particles outside the heat exchange tubes transfers heat to the water or steam inside the heat exchange tubes, ultimately producing superheated steam. Meanwhile, the cold water or saturated water can further utilize the remaining waste heat, thereby achieving maximum recovery of the hot slag particle waste heat. [Brief explanation of the drawings]

[0053] [Figure 1] FIG. 1 is a schematic diagram of a slag particle waste heat recovery system according to an embodiment of the present invention. [Figure 2] FIG. 2 is a schematic diagram of a slag particle waste heat recovery system according to another embodiment of the present invention. [Figure 3] FIG. 3 is a schematic diagram of a slag particle waste heat recovery system according to another embodiment of the present invention. [Figure 4] FIG. 4 is a schematic diagram of the internal structure of a heat exchanger according to an embodiment of the present invention. [Figure 5] FIG. 5 is a schematic diagram of a slag particle waste heat recovery system according to a modified embodiment of the present invention. [Figure 6] FIG. 6 is a schematic diagram of a slag particle waste heat recovery system according to another modified embodiment of the present invention. [Figure 7] FIG. 7 is a schematic diagram of a high temperature storage tank according to the present invention. [Figure 8] FIG. 8 is a schematic diagram of the structure and process of another granulation device according to the present invention. [Figure 9] FIG. 9 is a schematic diagram of the structure and process of another granulation device according to the present invention. [Figure 10] FIG. 10 is a schematic diagram of a heat exchanger according to the present invention. [Figure 11] FIG. 11 is a cross-sectional schematic view of a heat exchanger according to the present invention. [Figure 12] FIG. 12 is a schematic diagram of a buffer tank drum according to the present invention. [Figure 13] FIG. 13 is a cross-sectional schematic view of a buffer tank drum according to the present invention. [Figure 14] FIG. 14 is a schematic diagram of another heat exchanger according to the present invention. [Figure 15] FIG. 15 is an enlarged cross-sectional view taken along line AA in FIG. [Figure 16] FIG. 16 is a cross-sectional view of a drum cylinder of another heat exchanger according to the present invention. [Figure 17] FIG. 17 is a side view of FIG. [Figure 18] FIG. 18 is a cross-sectional view of another heat exchanger feed device according to the present invention. [Figure 19] FIG. 19 is an enlarged cross-sectional view taken along line BB in FIG. [Figure 20] FIG. 20 is a cross-sectional view of another heat exchanger exhaust device according to the present invention. [Figure 21] FIG. 21 is an enlarged cross-sectional view taken along line CC in FIG. [Figure 22] FIG. 22 is a three-dimensional view of a material-guide spiral plate of another heat exchanger according to the present invention. [Figure 23] FIG. 23 is a schematic diagram of a slag particle waste heat recovery system according to another embodiment of the present invention. [Figure 24] FIG. 24 is a schematic diagram of a heat exchanger according to another embodiment of the present invention. [Figure 25] FIG. 25 is a schematic diagram of a heat exchanger cylinder according to another embodiment of the present invention. [Figure 26] FIG. 26 is a schematic diagram of a superheater according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0054] Detailed Description Reference will now be made in detail to embodiments of the invention, one or more examples of which are illustrated in the accompanying drawings. The detailed description uses numerical and alphabetical reference characters to designate features in the drawings. Like or identical reference numbers in the drawings and the description are used to refer to like or identical parts of the invention.

[0055] Each feature limitation can be combined and interchanged here and throughout the specification and claims unless the context dictates otherwise. For example, all ranges disclosed herein include and indicate interchangeability of components and devices so long as their functionality is similar. [Example]

[0056] Referring to Figure 1, it shows a recuperative waste heat recovery system for high temperature solid slag particles, which comprises: The granulation device 11 is a gas-quenching granulation device, The granulation chamber 111 has a box structure, and has a slag inlet 1111 at the top and a slag chute 1100 disposed above the slag inlet 1111; and a high-temperature slag outlet 1112 disposed at the bottom of the granulation chamber 111; The granulation chamber 111 has a high-pressure nozzle 112, which is a supersonic nozzle, located at the top of one side wall, and the outlet of the high-pressure nozzle 112 corresponds to the high-temperature molten slag 1200 entering from the slag inlet 1111; preferably, the high-pressure nozzle 112 is connected to an air compressor 113, an air handler 114, and a fan 115; the top of the other side wall of the granulation chamber 111 is equipped with an air outlet 1113, a dust collector 119, and a fan 120; more preferably, the high-pressure nozzle 112 is a Laval nozzle; and the dust collector 119 is a cyclone dust collector or a bag dust collector; The recuperative heat exchanger 12 has a cylinder 121, which is of a metal shell-and-tube structure and has a cooling medium inlet 1211 and a cooling medium outlet 1212 at its end, the cooling medium inlet 1211 and the cooling medium outlet 1212 being respectively connected to a waste heat recovery facility; preferably, a cooling medium distribution device 1215 is installed at the cooling medium outlet 1212 side; an inlet 1213 is arranged near the cooling medium outlet 1212 on the side wall of the cylinder and is connected to the high-temperature slag outlet 1112 of the granulation device 11 via a conveying pipeline; a low-temperature slag outlet 1214 is arranged at the cooling medium inlet 1211 side of the cylinder 121 of the recuperative heat exchanger 12; a spiral plate 122 is arranged on the recuperative heat exchanger 12 and has several interconnected through-holes thereon, into which heat exchange tube sets 123 are inserted; preferably, the outer surface of the outlet side of the cylinder is circumferentially welded with a scraper; A conveyor 125 is disposed below the cold slag outlet 1214 of the recuperator 12, and preferably the conveyor 125 is a spiral conveyor.

[0057] Waste heat recovery equipment: It has a steam drum 13 connected to the cooling medium inlet 1211 of the recuperative heat exchanger 12 via a downcomer tube and a circulation pump 14; the cooling medium inlet 1212 of the recuperative heat exchanger 12 is connected to the steam-water mixture of the steam drum 13 via a pipeline, and the saturated steam pipe of the steam drum 13 is connected to the steam pipe network; the water supply pipeline of the steam drum 13 is connected to the water tank 118 via a water pump 116, a water treatment device 117 and a water pump 116'.

[0058] Preferably, the shell of the cylinder 121 of the recuperative heat exchanger 12 adopts a water-cooled wall structure and has a cylinder heat exchange tube sleeve 1216, a core-shaft heat exchange tube 124, a spiral plate 122 arranged inside the cylinder 121, and a heat exchange tube set 123 inserted into the spiral plate 122.

[0059] The slag particle waste heat recovery method of Example 1 is as follows: 1) The molten slag enters the granulation device for granulation of the molten slag to obtain slag particles. During the granulation process, the air exchanges heat with the molten slag, and is discharged through a dust collector and a fan; 2) The slag particles enter the recuperative heat exchanger, where they carry out indirect contact heat exchange with water or steam from the steam drum via a heat exchange tube set, and the water or steam absorbs heat and then returns to the steam drum and / or superheater and evaporator for heat exchange; the heat-exchanged low-temperature slag particles are pushed down to the conveyor by the spiral plate 22 and discharged via the conveyor. [Example]

[0060] Referring to FIG. 2, it shows a variation of a recuperative waste heat recovery system for hot solid slag particles, which comprises: It has a granulation device 21 which is a gas-quenched granulation device, which granulation device: The granulation chamber 211 has a box structure, and has a slag inlet 2111 at the top and a slag chute 2100 above the slag inlet 2111; and a high-temperature slag discharge outlet 2112 is disposed at the bottom of the granulation chamber 211; The granulation chamber 211 has a high-pressure nozzle 212, which is a supersonic nozzle, arranged at the top of one side wall; the outlet of the high-pressure nozzle 212 corresponds to the high-temperature slag 2200 entering from the slag inlet; the air outlet 2113, the dust collector 213 and the fan 214 are arranged at the top of the other side wall of the granulation chamber 211; preferably, the high-pressure nozzle 212 is connected to an air compressor 215, an air handler 216 and a fan 214'; more preferably, the high-pressure nozzle 212 is a Laval nozzle; The recuperative heat exchanger 22 has a cylinder 221 with a slag particle inlet 2211 and a valve at the top, corresponding to the high-temperature slag discharge outlet 2112 of the granulation device 1; the upper part of one side wall of the cylinder 221 is provided with an air outlet 2212, and the lower part of the other side wall is provided with an air inlet pipeline 2213 and a fan 2214; the bottom of the cylinder 221 is provided with a slag particle outlet 2215 and a valve; a heat exchange tube 222 is arranged inside the cylinder 221, and both ends (i.e., the inlet and outlet) of the heat exchange tube 222 are arranged outside the cylinder 221 and connected to the waste heat recovery equipment 25 via pipelines; a guide plate 223 is arranged at the upper part inside the cylinder 221 below the slag inlet 2211 to guide the uniform flow and fall of the slag particles; more preferably, the lower part inside the cylinder 221 is provided with an air distribution equipment 224, and the preferred air distribution equipment 224 is an air distribution plate; a conveyor 23 disposed below the slag particle outlet 2215 of the cylinder 221; preferably, the conveyor 23 is a spiral conveyor or a belt conveyor; It has a dust collector 24, the inlet end of which is connected to the air outlet 2212 of the cylinder 221 of the recuperative heat exchanger 22 via a pipeline and a valve F1; and the outlet of the dust collector 24 is connected to the waste heat recovery equipment 25 via a pipeline.

[0061] Preferably, the waste heat recovery facility 25 comprises: The air inlet 2531 is disposed in the sealed container 253 and is connected to the outlet of the dust collector 24 via a pipeline; the outlet 2532 of the sealed container 253 is connected to the air purifier via a pipeline and a fan 254; preferably, the evaporator 252 and the heater 251 adopt a coil-tube structure; It has a steam drum 256, the inlet of which is connected to the water outlet of the heat exchange tube 222 via a pipeline; the saturated steam outlet of the steam drum 256 is connected to the inlet of the superheater 251 via a pipeline and a valve 257, and the outlet pipeline of the superheater 251 is connected to a steam pipe network; the water inlet of the steam drum 256 is connected to the outlet of the evaporator 252 via a pipeline and a water pump 257', and the inlet of the evaporator 252 is connected to a water tank 258 via a pipeline and a water pump 257''; preferably, a water treatment device 259 is arranged in the inlet pipeline of the evaporator 252.

[0062] The slag particle waste heat recovery method of Example 2 is as follows: 1) The molten slag enters the granulation device for granulation of the molten slag to obtain slag particles. During the granulation process, the air exchanges heat with the molten slag, and is discharged through a dust collector and a fan; 2) The slag particles enter the recuperative heat exchanger, and the slag particles carry out indirect contact heat exchange with the water or steam from the steam drum through the heat exchange tube set, and the water or steam absorbs heat, and then returns to the steam drum and / or the superheater and evaporator for heat exchange; the slag particles fall evenly under the action of the guide plate of the recuperative heat exchanger, and during the falling process, they exchange heat with the air blown out by the air distribution equipment arranged at the bottom of the recuperative heat exchanger, delaying the falling time; 3) The feed water in the recuperator is supplied by the steam drum, and the feed water absorbs heat and then returns to the steam drum; the heat from the hot air from the recuperator is transferred to the superheater, and finally the water is converted into superheated steam through the superheater for external power output. [Example]

[0063] Referring to FIG. 3, it shows another variation of a recuperative waste heat recovery system for hot solid slag particles, which comprises: The heat exchanger 31 has a metal shell-and-tube structure, and is divided into a superheating section 3101 and an evaporation section 3102 from top to bottom; a first heat exchange tube 32 and a second heat exchange tube 33 are disposed in the superheating section 3101 and the evaporation section 3102, respectively; The steam drum 34 has an inlet 341, a saturated steam outlet 342, a saturated water outlet 343 and a saturated steam-water mixture inlet 344; the saturated steam outlet 342 is connected to the inlet end of the first heat exchange tube 32 in the superheating section 3101 of the heat exchanger 31 via a pipeline, and the outlet end of the first heat exchange tube 32 is connected to the steam pipe network via a buffer tank 35 and a pipeline; the saturated water outlet 343 is connected to the inlet end of the second heat exchange tube 33 in the evaporation section 3102 of the heat exchanger 31 via a pipeline and a circulation pump 36; the outlet end of the second heat exchange tube 33 is connected to the saturated steam-water mixture inlet 344 of the steam drum 34 via a pipeline; a heat exchanger (31) having guide plates (37) arranged vertically at intervals inside the heat exchanger (31), the guide plates having through holes for the first heat exchange tube (32) and the second heat exchange tube (33) to pass through; having a material loading-dispensing device 38 located at the top of the heat exchanger 31; a material distribution chute 39 disposed inside the heat exchanger 31 and below the material loading-distribution device 38; hot slag particles 3100 enter the heat exchanger 31 via the material loading-distribution device 38 and the material distribution chute 39; and The heat exchanger 31 has a discharge device 310 arranged at the discharge outlet at the bottom.

[0064] Still referring to FIG. 4, this recuperative waste heat recovery system for hot solid slag particles also: The heat exchanger 31 has a disturbance rod 3111 inserted between the first heat exchange tube 32 and the second heat exchange tube 33, one end of the disturbance rod is fixed to a fixed base 3112, and the other end of the disturbance rod extends outside the heat exchanger 31; several disturbance arms 3113 are arranged at intervals along the axial direction on the rod body of the disturbance rod 3111, and the axes of the disturbance arms 3113 and the axis of the disturbance rod 3111 form an angle; preferably, adjacent disturbance arms 3113 are arranged in an antisymmetric manner; The disturbing rod 3111 has a drive device 3114, the output end of which is connected to the end of the disturbing rod 3111 that extends outside the heat exchanger 31.

[0065] Preferably, the drive device 3114 is of the worm and worm wheel type, the worm wheel being coaxially connected to the end of the disturbing rod 3111 .

[0066] The slag particle waste heat recovery method of Example 3 is as follows: 1) The hot slag particles are uniformly distributed at the inner top of the heat exchanger by the material loading-distribution device and the material distribution chute, forming a horizontal material surface, and flowing downward under gravity; 2) Under the driving of the circulation pump, saturated water flows out of the steam drum and enters the second heat exchange tube of the evaporation section of the heat exchanger; after heat exchange with the high-temperature slag particles, it becomes a saturated steam-water mixture, which then returns to the steam drum via the pipeline to achieve the separation of steam and water; 3) The saturated steam in the steam drum flows into the first heat exchange tube of the superheating section of the heat exchanger under pressure difference; after heat exchange with the high-temperature slag particles, it forms superheated steam, which then flows into the buffer tank via the pipeline and finally enters the steam pipe network; 4) The high-temperature slag particles are converted into low-temperature slag particles through heat exchange with the first and second heat exchange tubes, move to the discharge outlet at the bottom of the heat exchanger, and are discharged from the heat exchanger via the discharge device.

[0067] Preferably, when the slug flow rate is low, the steam pipeline in the superheat section is closed and switched to saturated steam production to ensure that the pipeline outlet in the evaporation section is a water-steam mixture.

[0068] Example 3 is divided into three main cycles: 1. Heat exchange tubes are arranged in the evaporation section and superheating section of the heat exchanger. Saturated water flows out of the steam drum under the drive of the circulation pump and enters the evaporation section. After heat exchange with the hot slag particles, the saturated water turns into a mixture of saturated water and steam, which then flows into the steam drum, where the steam and water are separated. 2. The saturated steam in the steam drum flows into the superheating section of the heat exchanger under pressure difference, exchanges heat with the high-temperature slag particles, forms superheated steam, flows into the buffer tank, and finally enters the steam pipe network. 3. The hot slag particles are transported to the material loading and distribution device and uniformly distributed to the top of the heat exchanger via the material distribution chute to form a horizontal material surface. The hot slag particles flow downward inside the heat exchanger under gravity, and the heat exchange tubes and guide plates act as constraints on the flow of the slag particles to avoid macro-scale flow deviation of the slag particles. When the slag particles reach the bottom of the heat exchanger, they are discharged from the heat exchanger via the discharge device. The cold slag particles enter the next processing stage.

[0069] During operation, the device should ensure that the pipeline outlet of the evaporation section of the heat exchanger is a water-steam mixture; the device should carry out material distribution to ensure that the material surface is flat and there is no height difference between the guide plates; the discharge device should be able to control the flow rate of the slag. [Example]

[0070] Referring to FIGS. 5 and 7, Example 4, based on Example 1, further comprises: The high-temperature storage tank 55 has at least one high-temperature storage tank 55 arranged between the granulation device 111 and the recuperative heat exchanger 52; at the top of the high-temperature storage tank 55, an inlet 551 and an inlet gate connected to the high-temperature slag outlet 1112 of the granulation device 111 are arranged; at the bottom of the high-temperature storage tank 55, an outlet 552 and an outlet gate connected to the inlet 5213 of the cylinder 521 of the recuperative heat exchanger 52 are arranged; at the bottom of one side wall of the high-temperature storage tank 55, an air inlet 553, an air inlet pipeline and a fan 554 are arranged; at the top of the opposite side wall, an air outlet 555 is arranged and is connected to the dust collector 57 via a pipeline and a valve; preferably, a temperature detection device 56 is arranged in the pipeline; and preferably, at the bottom inside the high-temperature storage tank 55, an air distribution equipment 556 connected to the air inlet pipeline is arranged. In this embodiment, the air distribution equipment 556 is an air distribution plate; more preferably, a filter screen 5501, insulation 5502 and an outer shell 5503 are disposed from the inside to the outside of the side wall of the high temperature storage tank 55.

[0071] Waste heat recovery equipment: A steam drum 53 is connected to a cooling medium inlet 5211 of the recuperative heat exchanger 52 via a downcomer tube and a circulation pump 54; a cooling medium outlet 5212 of the recuperative heat exchanger 52 is connected to a steam-water mixture inlet of the steam drum 53 via a pipeline and a circulation pump 54'; It has a superheater 58 and an evaporator 59 arranged in a sealed container 510, and the sealed container 510 has an inlet 51001 and an outlet 51002 arranged therein; the inlet is connected to the outlet pipeline of the dust collector 57 via a pipeline; the outlet of the sealed container 510 is connected to the fan 520' and the air purifier 531 via a pipeline; the saturated steam pipe of the steam drum 53 is connected to the inlet of the superheater 58 via a saturated steam valve 533, and the outlet of the superheater 58 is connected to a steam pipe network; the inlet pipeline of the evaporator 59 is connected to a water treatment device 517, a water pump 516 and a water tank 518; a water pump 532 is arranged in the outlet pipeline of the evaporator 59 and is connected to the water supply pipeline of the steam drum 53.

[0072] The slag particles first enter a high-temperature storage tank for temporary storage, and then enter a recuperative heat exchanger. During the temporary storage of the slag particles in the high-temperature storage tank, the hot air generated in the high-temperature storage tank is filtered by a dust collector and then sent to a waste heat recovery facility for heat exchange. Preferably, multiple high-temperature storage tanks are employed and arranged in parallel. [Example]

[0073] Referring to FIGS. 6 and 7, Example 5, which is based on Example 2, further comprises: At least one hot storage tank 66 is disposed between the granulation device 211 and the recuperative heat exchanger 22 .

[0074] At the top of the high-temperature storage tank 66, there is an inlet 551 and an inlet gate connected to the discharge outlet at the bottom of the granulation tank 211; at the bottom of the high-temperature storage tank 66, there is an outlet 552 and an outlet gate connected to the slag particle inlet 2211 of the cylinder 221 of the recuperative heat exchanger 22; at the bottom of one side wall of the high-temperature storage tank 66, there is an air inlet 553, an air inlet pipeline and a fan 554; at the top of the other opposite side wall, there is an air outlet 555 and it is connected to the inlet pipeline of the dust collector 24 via a pipeline; preferably, a temperature detection device 67 is arranged in the pipeline; at the bottom of the high-temperature storage tank 66, there is an air distribution equipment 556 and it is connected to the air inlet pipeline; the air distribution equipment 556 is preferably an air distribution plate and it is connected to a fan; more preferably, a filter screen 5501, an insulating material 5502 and an outer shell 5503 are arranged from the inside to the outside of the side wall of the high-temperature storage tank 66.

[0075] The slag particles first enter a high-temperature storage tank for temporary storage, and then enter a recuperative heat exchanger. During the temporary storage of the slag particles in the high-temperature storage tank, the hot air generated in the high-temperature storage tank is filtered by a dust collector and then sent to a waste heat recovery facility for heat exchange; preferably, multiple high-temperature storage tanks are adopted and arranged in parallel. [Example]

[0076] Referring to Figure 8, it shows a gas-water granulation device as another embodiment of a granulation device that can replace the gas-quench granulation device in the preceding examples. This gas-water granulation device: The granulation tank 611 has a box structure, and a slag inlet 6111 is disposed at the top of the granulation tank, and a slag chute 6100 is disposed above the slag inlet 6111; and a slag outlet 6112 is disposed at the bottom of the granulation tank 611; The granulation tank 611 has a high-pressure nozzle 612, which is a spray nozzle or a gas-liquid two-fluid nozzle, arranged on the upper side wall; the outlet of the high-pressure nozzle 612 corresponds to the high-temperature molten slag 6200 entering through the slag inlet 6111; the high-pressure nozzle 612 is connected to a gas-water mixer 629, which is connected to a compressed air pipeline and an air flow control valve 6291, and a water supply pipeline having a water flow control valve 6292, respectively; and an air-water outlet 6114, a filter 626, a gas-water separator 627 and a fan 628 are arranged on the upper part of the other side wall of the granulation tank 611. [Example]

[0077] Referring to Figure 9, it shows a rotating cup granulation device as another embodiment of a granulation device that can replace the gas-quench granulation device in the preceding examples. This rotating cup granulation device: The granulation chamber 711 has a box structure, and a slag inlet 7111 is arranged at the top of the granulation chamber, and a slag outlet 7112 is arranged at the bottom of the granulation chamber; air inlets 7115, 7115', an air inlet pipeline, and fans 734, 734' are arranged at the bottom of the side wall of the granulation chamber 711; an air outlet 7113, an air outlet pipeline, a dust collector 719, and a fan 720 are arranged at the top of the other side wall of the granulation chamber 711; a rotary motor 735 disposed vertically in the center of the granulation chamber 711; A rotary motor 735 has a rotary cup 736 disposed at the output end thereof. [Example]

[0078] Referring to FIG. 10 and FIG. 11, it further shows the structure of the recuperative heat exchanger 22 in Example 2, which comprises: The drum cylinder 81 has a cooling medium inlet 8101 and a cooling medium outlet 8102 at both ends, which are respectively connected to external pipelines via rotary joints; a high-temperature slag particle inlet and an inlet pipeline 8103 are arranged near the cooling medium outlet 8102 on the side wall of the drum cylinder 81, and a low-temperature slag particle outlet and an outlet pipeline 8104 are arranged near the cooling medium inlet 8101 on the side wall of the drum cylinder 81; the drum cylinder 81 is installed with a downward inclination toward the cooling medium outlet side, ensuring that the high-temperature slag particles move inside the drum cylinder 81 from the inlet end to the discharge end; It has several lifting plates 82, each L-shaped, with one end circumferentially spaced apart vertically along the inner wall of the drum cylinder 81; The drum cylinder 81 has heat exchange tubes 83 disposed at the center thereof, on the inner wall thereof, and on the inside of the lifting plate 82; It has a drive device (not shown) with gearing, a drive motor and corresponding support structure located outside the drum cylinder 81.

[0079] Preferably, the drum cylinder 81 comprises an inner cylinder 811, an outer cylinder 812 and a thermal insulator 813 between the inner cylinder 811 and the outer cylinder 812.

[0080] Preferably, the heat exchange tubes 83 have an A-type heat exchange tube set 831 and a B-type heat exchange tube set 832; the outer wall of the A-type heat exchange tube set 831 has fins 8311 vertically along the circumferential direction to form a finned tube; the A-type heat exchange tube set 831 is arranged at the center of the drum cylinder 81, and preferably, the fins 8311 are ring ribs, column ribs or plate ribs; and the B-type heat exchange tube set 832 is arranged on the inner wall of the lifting plate 82 or the drum cylinder 81.

[0081] Preferably, the heat exchange tubes 83 are arranged in the drum cylinder using multiple tube passes, and the number of tube passes is an odd number; preferably, the resistance of the tube pass of each heat exchange tube is consistent. [Example]

[0082] Referring to FIG. 12 and FIG. 13, based on Example 8, a buffer tank drum 91 can be further connected in series before the hot slag particle inlet of the recuperative heat exchanger 22, which is: The buffer tank drum 91 has an inlet and an inlet pipeline 9101 arranged on one side wall of the buffer tank drum, and a discharge outlet and a discharge outlet pipeline 9102 arranged on the other side wall of the buffer tank drum; the buffer tank drum 91 is installed with an inclination toward the discharge outlet side, ensuring that the high-temperature slag particles move from the inlet end to the discharge end inside the cylinder; first lifting plates 92, which are L-shaped and have one end circumferentially spaced apart vertically along the inner wall of the buffer tank drum 91; It has a first drive device (not shown) having gearing, a first drive motor and a corresponding support structure disposed on the outer wall of the buffer tank drum. [Example]

[0083] Referring to FIGS. 14 to 22, another structure of the recuperative heat exchanger 22 in the second embodiment is further shown, which includes: The drum cylinder 101 is horizontally arranged and mainly consists of a cylinder 1011, a material guide spiral plate 1012, and a heat exchange tube set 1013; the material guide spiral plate 1012 is welded to the inner wall of the cylinder 1011, and there are several through holes 10121 arranged in the material guide spiral plate 1012; the heat exchange tube set 1013 is inserted through the through holes of the material guide spiral plate 1012 and is uniformly arranged inside the cylinder 1011; the cylinder 1011 is covered with an insulating layer on the outside; a feeding device 102 and a discharging device 103 respectively arranged at the ends of the drum cylinder 101; a support roller device 104 disposed at the bottom of the drum cylinder 101 near the discharge device end of the drum cylinder; a holding roller device 105 disposed at the bottom of the drum cylinder 101 near the feeding device end of the drum cylinder; The drum cylinder 101 is supported by the supporting roller device 104 and the holding roller device 105 and can perform continuous rotational movement under the drive of the transmission device 106.

[0084] The heat exchange tube set is uniformly distributed inside the cylinder.

[0085] Preferably, the cylinder 1011 of the drum cylinder 101 consists of three sections, which are made of heat-resistant stainless steel, stainless steel and alloy steel, respectively, forming a high-temperature section, a medium-temperature section and a low-temperature section, respectively.

[0086] Preferably, the transmission device 106 is composed of a main transmission system and an auxiliary transmission system that are mutually self-locking, and the main motor of the main transmission system adopts a variable frequency speed regulating motor.

[0087] Referring to Figures 18 and 19, the delivery device 102 of the present invention: It has a first fixed base 1021, and a first connecting tube body 10211 is arranged on the top of the first fixed base; one end of the first connecting tube body 10211 of the first fixed base 1021 is inserted into one end of the cylinder 1011 of the drum cylinder 101, there is a clearance fit between them, and it is sealed by a sealing device 1024; the top of the tube body 10211 is provided with an inlet 102111 and a discharge connecting tube 10212; preferably, the distance L between the center line of the drum cylinder 1011 extending into the first connecting tube body 10211 of the first fixed base 1021 and the discharge connecting tube 10212 is half the radius of the inlet of the discharge connecting tube 10212; a first block plate 1022 inserted into the other end of the first connecting tube body 10211 of the first fixed base 1021, with a clearance fit therebetween and sealed by a sealing device 1024'; a number of fixing holes 10221 are arranged in the first block plate 1022 for the heat exchange tube set 1013 to pass through, and one end of the heat exchange tube set 1013 is welded to the first block plate 1022; preferably, a manhole 10222 is arranged in the center of the first block plate 1022; It has a first rotary connecting pipe 1023 fixedly connected to the first blocking plate 1022 via a flange.

[0088] Referring to Figures 20 and 21, the discharge device 103 of the present invention comprises: It has a second fixed base 1031, and a second connecting tube body 10311 is arranged on the top of the second fixed base; the other end of the cylinder 1011 of the drum cylinder 101 is inserted into one end of the second connecting tube body 10311 of the second fixed base 1031, there is a clearance fit between them, and it is sealed by a sealing device 1035; the top of the second connecting tube body 10311 is provided with a smoke exhaust outlet 103111 and a smoke exhaust connecting pipe 10312; the discharge outlet 103112 and a corresponding discharge pipe 10313 are arranged on one side of the middle or bottom of the second connecting tube body 10311; preferably, the discharge pipe 10313 is arranged tangentially along the outer periphery of the second connecting tube body 10311; a second block plate 1032 inserted into the other end of the second connecting tube body 10311 of the second fixed base 1031, with a clearance fit therebetween and sealed by a sealing device 1035'; a number of fixing holes 10321 are arranged in the second block plate 1032 for the heat exchange tube set 1013 to pass through, and the other end of the heat exchange tube set 1013 is welded to the second block plate 1032; preferably, a manhole 10322 is arranged in the center of the second block plate 1032; a second rotary connecting pipe 1033 fixedly connected to the second blocking plate 1032 via a flange; There are several scrapers 1034, which are uniformly arranged along the circumference of the inner wall of the drum cylinder 1011 in the second connecting pipe 10311; preferably, the angle between the scraper 1034 and the tangent direction of the circumference of the drum cylinder 101 is 40 to 50 degrees; one end of the scraper 1034 is welded to the drum cylinder 101, and the other end is welded and connected to the second block plate 1032.

[0089] Preferably, the length of the material guide spiral plate extending outside the drum cylinder is 100 to 200 mm.

[0090] Preferably, the distance between the end of the drum cylinder extending into the second connecting pipe and the second blocking plate 32 is 500 to 800 mm.

[0091] During operation, the horizontally disposed drum cylinder is supported by the support roller device and the holding roller device, and can perform continuous rotational motion under the drive of the main transmission system of the transmission device. The rotation of the drum cylinder drives the rotation of the material guide spiral plate 32, which then drives the high-temperature solid particles to move from right to left in the gap between the inner wall of the drum cylinder and the outer surface of the heat exchange tube. The heat exchange medium flows from left to right inside the heat exchange tube, ensuring that the high-temperature solid particles and the heat exchange medium do not come into direct contact with each other, thereby meeting the requirement of indirect heat transfer and exchange.

[0092] The main and auxiliary transmission systems of the transmission device are mutually self-locking, i.e., when the main transmission system is operating, the auxiliary transmission system cannot operate, and vice versa. The main transmission system operates during operation, but the auxiliary transmission system cannot operate. The auxiliary transmission system only operates when the drum cylinder is undergoing maintenance or the main motor is powered off. [Example]

[0093] 23-26, there is further shown another recuperative waste heat recovery system for high temperature solid slag particles of the present invention, which comprises: A heat exchanger 1110 is provided, which comprises: It has a heat exchange cylinder 11101, and at both ends of the heat exchange cylinder, a feed box 11102, a discharge box 11103, and corresponding inlets 111021, discharge outlets 111031, and smoke exhaust outlets 111032 are arranged; a water header 11104 and a steam-water header 11105 disposed at the ends of the discharge box 11103 and the feed box 11102 of the heat exchange cylinder 11101, respectively; a water inlet rotary joint 11106 and a steam outlet rotary joint 11107 disposed at the outer ends of a water header 11104 and a steam-water header 11105, respectively, on the heat exchange cylinder 11101; having twin support-holding roller devices 11108 arranged on both sides of the heat exchange cylinder 11101; a rotary drive device 11109 disposed below the central portion of the heat exchange cylinder 11101; a steam drum 1120 having an ascending pipe 11201, a descending tube 11202, a steam outlet pipe 11203, a vent pipe 11204, a safety valve 11205, a pressure gauge 11206, a water level gauge 11207, a steam drum blowdown pipe 11208, an emergency water discharge pipe 11209 and a water inlet pipe 11210; The steam drum 1120 is connected to the steam outlet rotary joint 11107 of the heat exchanger 1110 via an ascending pipe 11201 and to the water inlet rotary joint 11106 of the heat exchanger 1110 via a descending tube 11202; the heat exchanger 1110 and the steam drum 1120 form a closed circulation system; the descending tube 11202 is connected in parallel with a booster pipe 11211, and a booster pump 1130 is disposed in the booster pipe 11211 to provide auxiliary power for the steam-water circulation flowing via the booster pump 1130; a superheater 1140, which includes, from top to bottom, a preheat module 1141, a superheat module 1142, and a combustion module 1143; a steam drum 1120 connected to the preheat module 1141 via a water inlet pipe 11210 and to the superheat module 1142 via a steam outlet pipe 11203; A blowdown expansion vessel 1150 is provided, and a heat exchanger blowdown pipe 11212 is disposed at the end of the downcomer tube 11202 of the steam drum 1120 and the water inlet rotary joint 11106 of the heat exchanger 1110, and the heat exchanger blowdown pipe 11212 of the heat exchanger is connected to the blowdown expansion vessel 1150; The water tank 116 has a water tank 116 equipped with a level gauge 1164, an inlet pipeline of the water tank equipped with an electric regulating valve 1163, and an outlet pipeline of the water tank connected to the inlet of a water supply pump 1170; an outlet pipeline 1171 of the water supply pump 1170 connected to a water inlet 11411 of a preheating module 1141 of the superheater 1140; a water outlet 11412 of the preheating module 1141 connected to the steam drum 1120 via a water inlet pipe 11210 of the steam drum 1120; an outlet pipeline of the water supply pump 1170 A bypass pipe 1172 is arranged between the superheater 1140 preheating module 1141 and the inlet pipeline 11210 of the steam drum 1120; when the superheater 1140 is undergoing maintenance due to a malfunction, the preheating module 1141 of the superheater 1140 can be short-circuited via the bypass pipe 1172; the water tank level gauge 1164 is interlocked with the electric regulating valve 1163 on the inlet pipeline to adjust the amount of water supplied to the water tank based on the liquid level in the water tank, thereby ensuring the amount of water in the water tank and preventing water shortage accidents.

[0094] A continuous spiral support tube sheet 111013 is welded to the inner wall of the heat exchange cylinder 11101, and the continuous spiral support tube sheet 111013 is spirally distributed along the axial direction inside the heat exchange cylinder 11101; the spiral support tube sheet cylinder has corresponding through holes, and several heat exchange tubes 111014 are inserted into the through holes of the spiral support tube sheet 111013; both ends of the heat exchange cylinder 11101 are equipped with flange tube sheets 111015, and both ends of the heat exchange tubes 111014 are fixed to the two flange tube sheets 111015 respectively; two The flange tube sheets 111015 are fixedly connected to the steam-water header 11105 and the water header 11104, respectively; one end of the heat exchange tubes 111014 is connected to the water header 11104, and the other end of the heat exchange tubes 111014 is connected to the steam-water header 11105; the water header 11104 is rotatably connected to the water inlet rotary joint 11106, and the steam-water header 11105 is rotatably connected to the steam outlet rotary joint 11107, with graphite material used for sealing the connections; the steam-water header 11105 and the water header 11104 rotate together with the heat exchanger cylinder 11101.

[0095] Referring to Figure 25, the heat exchange cylinder 11101 has an inner cylinder wall 111011 and an outer cylinder wall 111012, where the inner cylinder wall 111011 and several heat exchange tubes 111014 form a heat exchange space, and insulation material is filled between the inner cylinder wall 111011 and the outer cylinder wall 111012; end plates 111016 are arranged at the ends of the inner cylinder wall 111011 and the outer cylinder wall 111012, and several discharge scrapers are welded between the end plates 111016 and the discharge side flange tube sheet 111015.

[0096] When the heat exchanger 1110 is in operation, hot slag enters the heat exchanger cylinder 11101 from the inlet 111021 via the feed box 11102. The rotary drive device 11109 drives the heat exchanger drum 11101 to rotate and provides forward motive force to the hot slag via the helical support tube sheet 111013 inside the heat exchanger cylinder 11101. When the hot slag reaches the discharge box 11103, it is lifted via the discharge scraper 111017 to the discharge outlet 111031 and discharged from the heat exchanger 1110 via the discharge outlet 111031.

[0097] The top of the steam drum 1120 is equipped with a safety valve 11205 and a pressure gauge 11206 to detect the pressure inside the steam drum and ensure the safe use of the steam drum. When the pressure in the steam drum exceeds the upper limit of the working pressure, the valve on the vent pipe 11204 is opened to reduce the pressure in the steam drum to the working pressure, and then the valve on the vent pipe 11204 is closed.

[0098] The bottom of the steam drum 1120 is equipped with a steam drum blowdown pipe 11208 and an emergency water discharge pipe 11209. The emergency water discharge pipe 11209 joins with the steam drum blowdown pipe 11208 and is connected to the blowdown expansion vessel 1150. The side wall of the steam drum is equipped with a water level gauge 11207 used to detect the water level inside the steam drum. When the water level in the steam drum exceeds the upper limit of the safe water level, a valve on the emergency water discharge pipe is opened and the water level is quickly lowered to a safe range. When the water level in the steam drum falls below the lower limit of the safe water level, the system stops working to ensure safe operation.

[0099] Referring to FIG. 26, a preheating module 1141, a superheating module 1142, and a combustion module 1143 are arranged in the superheater 1140 in this order from top to bottom.

[0100] The combustion module 1143 has a furnace 11431, a burner 11432, a flue gas circulation pipeline 11433, and a circulation fan 11434; fuel gas and air are ejected from the burner 11432, thoroughly mixed, and burned in the furnace 11431 to generate high-temperature flue gas. The high-temperature flue gas is mixed with the low-temperature flue gas drawn back by the circulation fan 11434 to form medium-high-temperature flue gas, which flows upward to the superheating module 1142. The circulation fan 11434 adjusts the return rate of the flue gas in the flue gas circulation pipeline 11433, thereby adjusting the temperature of the flue gas entering the superheating module 1142, and ensures that the output superheated steam meets the process requirements.

[0101] The superheat module 1142 has a steam inlet 11421 , a steam inlet header 11422 , a steam outlet header 11423 , a steam outlet 11424 and a superheater tube set 11425 .

[0102] The steam outlet tube 11203 of the steam drum 1120 is connected to the steam inlet 11421 of the superheat module 1142. The saturated steam in the steam drum 1120 is transported to the steam inlet header 11422 via the steam inlet 11421 of the superheat module 1142. The saturated steam is uniformly distributed to the superheat tube set 11425 by the steam inlet header 11422. The medium- to high-temperature flue gas generated by the combustion module 1143 flows upward through the superheat module 1142 and heats the saturated steam in the superheat tube set 11425 to become superheated steam. The superheated steam is collected via the steam outlet header 11423 and then connected to a pipeline via the steam outlet 11424 on the steam outlet header of the superheat module for user use. After heat exchange, the temperature of the flue gas is reduced and continues to flow towards the preheat module 1141.

[0103] The preheat module 1141 has a water inlet 11411 , a water inlet header 11412 , a water outlet header 11413 , a water outlet 11414 and a preheat tube set 11415 .

[0104] The outlet pipeline 1171 of the water supply pump is connected to the water inlet 11411 of the preheating module 1141. The cold water in the water tank 1160 is transported to the water inlet header 11412 of the preheating module 1141 via the water inlet 11411 of the preheating module 1141. The cold water is uniformly distributed to the preheating tube set 11415 via the water inlet header 11412. The flue gas after heat exchange in the superheating module 1142 flows upward through the preheating module 1141 and heats the cold water in the preheating tube set 11415 to 90°C, which is then collected by the water outlet header 11413 of the preheating module 1141. The water outlet 11414 on the water outlet header 11413 is connected to the water inlet pipe 11210 of the steam drum 1120 to deliver hot water to the steam drum 1120.

[0105] The working steps of Example 11 are as follows: A water supply pump 1170 delivers cold water in the water tank 1160 via a pipeline to the preheating module 1141 of the superheater 1140. The cold water is preheated by the preheating module 1141 of the superheater 1140 and becomes hot water, which is then sent to the steam drum 1120 via the steam drum water inlet pipe 11210. Hot water is sent to the heat exchanger's water inlet rotary joint 11106 via a downcomer tube 11202, and a water header 11104 distributes the hot water evenly among the heat exchanger tubes 111014. Hot slag continuously enters the heat exchanger 1110 via the inlet 111021, and the heat exchanger 1110 continuously rotates. A helix support tube sheet 111013 transports the hot slag to the discharge end. During this process, the hot slag is in continuous contact with the heat exchange tubes 111014, and the hot water in the heat exchange tubes 111014 absorbs the heat carried by the high-temperature material and becomes high-temperature water and saturated steam; due to the decrease in density, there is a density difference with the hot water in the downcomer tubes 11202, and the high-temperature water and saturated steam then enter the steam drum 1120 via the upcomer pipe 11201. The high-temperature water and saturated steam are separated in the steam drum 1120. The saturated steam is transported via the steam drum outlet pipe 11203 to the superheating module 1142 of the superheater 1140, where it is heated to superheated steam and sent out for external use. The high-temperature water enters the steam drum 1120 and returns to the heat exchanger 1110 via the downcomer tubes 11202, completing the heat absorption cycle. The slag after heat exchange is discharged from the heat exchanger 1110 via the discharge outlet 111031. The slag dust and flue gas produced in the heat exchanger 1110 is sent to the dust removal system via the flue gas outlet 111032.

[0106] The above description is only a preferred specific embodiment of the present invention, and the protection scope of the present invention is not limited thereto. Within the technical scope disclosed in the present invention, any equivalent replacement or modification made by those skilled in the art based on the technical solutions and inventive concepts disclosed in the present invention should belong to the protection scope of the present invention.

Claims

1. 1. A recuperative waste heat recovery system for hot solid slag particles, comprising: having a granulation device which is preferably a gas-quench granulation device, a gas-water granulation device or a rotating cup granulation device; a rolling recuperative heat exchanger having a slag particle inlet corresponding to the slag outlet of the granulation device, a slag particle outlet, and a heat exchange tube set disposed within the recuperative heat exchanger, the heat exchange tube set having a cooling medium inlet and a cooling medium outlet, the cooling medium being preferably water; and a waste heat recovery facility, wherein the cooling medium inlet and the cooling medium outlet are each connected to the waste heat recovery facility via a pipeline; a recuperative waste heat recovery system for said hot solid slag particles;

2. The waste heat recovery equipment comprises: a steam drum having a steam drum water inlet, a steam drum water outlet, a saturated steam outlet, and a steam-water mixture inlet; having a water tank; the steam drum water inlet is connected to the water tank, the cooling medium inlet is connected to the steam drum water outlet, and the cooling medium outlet is connected to the steam-water mixture inlet.

10. The recuperative waste heat recovery system for high temperature solid slag particles according to claim 1.

3. 3. The recuperative waste heat recovery system for high-temperature solid slag particles according to claim 1 or 2, further comprising a conveyor and a dust collector disposed below the slag particle outlet, the inlet end of the dust collector being connected to the air outlet of the recuperative heat exchanger via a pipeline, and the outlet of the dust collector being connected to the waste heat recovery facility via a pipeline.

4. 4. The recuperative waste heat recovery system for high-temperature solid slag particles according to claim 1, wherein the heat exchanger has a cylinder with a metal shell-and-tube structure, the slag particle inlet and the slag particle outlet are respectively arranged on the side wall of the cylinder on the side of the cooling medium outlet and the side wall of the cylinder on the side of the cooling medium inlet; a spiral plate with interconnected through holes is arranged inside the cylinder, and heat exchange tubes are inserted into the through holes; preferably, the outer shell of the cylinder adopts a water-cooled wall structure, and has a cylinder heat exchange tube sleeve, a core-shaft heat exchange tube, a spiral plate arranged inside the cylinder, and a heat exchange tube set passing through the spiral plate.

5. the heat exchanger comprising: The present invention provides a drum cylinder, wherein the slag particle inlet is disposed on a side wall of the drum cylinder near the cooling medium outlet, and the slag particle outlet is disposed on the side wall of the drum cylinder near the cooling medium inlet; the drum cylinder is installed with a downward inclination toward the cooling medium outlet side, allowing the slag particles to move from the slag particle inlet to the slag particle outlet; preferably, the drum cylinder comprises an inner cylinder, an outer cylinder, and a thermal insulator disposed between the inner cylinder and the outer cylinder; a plurality of lifting plates disposed at intervals on the inner wall of the drum cylinder along a circumferential direction of the inner wall of the drum cylinder, the lifting plates being L-shaped; a cylinder drive device, the cylinder drive device having gearing, a drive motor, and a support structure disposed outside the drum cylinder, the cylinder drive device being used to rotate the drum cylinder; the heat exchange tube set is disposed at the center of the drum cylinder, on the inner wall of the drum cylinder, and inside the lift plate; A recuperative waste heat recovery system for high-temperature solid slag particles according to any one of claims 1 to 3.

6. 6. The recuperative waste heat recovery system for high-temperature solid slag particles according to claim 5, wherein the heat exchange tube set comprises an A-type heat exchange tube set and a B-type heat exchange tube set, and the outer wall of the A-type heat exchange tube set has a plurality of fins arranged vertically in the circumferential direction to form finned tubes, the A-type heat exchange tube set is arranged at the center of the drum cylinder, and the fins are preferably ring ribs, column ribs, or plate ribs; and the B-type heat exchange tube set is arranged on the lifting plate or the inner wall of the drum cylinder.

7. 7. The recuperative waste heat recovery system for high-temperature solid slag particles as described in claim 6, wherein the heat exchange tube set is arranged in the drum cylinder by adopting multiple tube passes, and the number of tube passes is odd; preferably, the flow resistance of each heat exchange tube is consistent.

8. moreover: A buffer tank drum is provided, the buffer tank drum having an inlet and an inlet pipeline on one side of its side wall, and a discharge outlet and a discharge outlet pipeline on the other side; the buffer tank drum is installed with an inclination toward the discharge outlet side, ensuring that the slag particles move from the inlet end to the discharge end inside the cylinder; a first material lift plate disposed circumferentially and vertically at intervals along the inner wall of the buffer tank drum, the first material lift plate being L-shaped; and a first drive device, the first drive device having a gearing, a first drive motor, and a corresponding support structure disposed on an outer wall of the buffer tank drum; A recuperative waste heat recovery system for high-temperature solid slag particles according to any one of claims 5 to 7.

9. the heat exchanger comprising: a drum cylinder disposed horizontally, the drum cylinder having a feeding device with a slag particle inlet and a discharge device with a slag particle outlet disposed at an end thereof; a material guide spiral plate disposed inside the drum cylinder, the material guide spiral plate having a through hole for the heat exchange tube set to pass through; a support roller device disposed at the bottom of the cylinder near the discharge device end of the cylinder; a holding roller device disposed at the bottom of the cylinder near the feed device end of the cylinder; a transmission device disposed on the support roller device; the cylinder is supported by the support roller device and the holding roller device, and can perform continuous rotational movement under the driving of the transmission device; the heat exchange tube set is uniformly distributed within the cylinder; A recuperative waste heat recovery system for high-temperature solid slag particles according to any one of claims 1 to 3.

10. The heat exchanger satisfies one or more of the following criteria, which criteria include: The cylinder is made of three sections, the three sections being made of heat-resistant stainless steel, stainless steel and alloy steel, respectively, forming a high-temperature section, a medium-temperature section and a low-temperature section in that order; The transmission device is composed of a main transmission system and an auxiliary transmission system that are mutually self-locking, and the main motor of the main transmission system adopts a variable frequency speed regulating motor; The length of the material guide spiral plate extending outside the cylinder is 100 to 200 mm.

10. The recuperative waste heat recovery system for hot solid slag particles according to claim 9.

11. the heat exchanger comprising: a heat exchanger cylinder having an inlet box with a slag particle inlet and an outlet box with a slag particle outlet at an end of the heat exchanger cylinder, the ends of the heat exchanger cylinder near the outlet box and the inlet box being respectively arranged with a water header and a steam-water header; twin support-holding roller devices disposed on either side of the heat exchanger cylinder; a rotary drive device disposed at the bottom of the central portion of the heat exchanger cylinder; the steam drum and the heat exchanger form a closed circulation system; The waste heat recovery equipment includes a superheater, and the superheater includes, from top to bottom, a preheating module, a superheating module, and a combustion module; the steam drum is connected to the preheating module via a water inlet pipe and to the superheating module via a steam outlet pipe; A blowdown pipe and an emergency water discharge pipe are arranged at the bottom of the steam drum, and the blowdown pipe and the emergency water discharge pipe are connected to a blowdown expansion vessel; A regulating valve, preferably an electric regulating valve, is arranged in the inlet pipeline of the water tank, and the outlet pipeline of the water tank is connected to the inlet of a water supply pump, and the outlet pipeline of the water supply pump is connected to the inlet of the superheater; preferably, the water tank is equipped with a level gauge. A recuperative waste heat recovery system for high-temperature solid slag particles according to any one of claims 1 to 3.

12. The recuperative waste heat recovery system for hot solid slag particles satisfies one or more of the following criteria, wherein: a continuous spiral support tube sheet welded to the inner wall of the heat exchanger cylinder, the continuous spiral support tube sheet being spirally distributed along the axial direction inside the heat exchanger cylinder; the spiral support tube sheet has corresponding through holes arranged therein, and the heat exchange tube sets are inserted into the through holes of the spiral support tube sheet; both ends of the heat exchanger cylinder are provided with flange tube sheets, and ends of the heat exchange tubes are fixed to the two flange tube sheets, respectively, and the flange tube sheets are fixedly connected to the steam-water header and the water header, respectively; one end of the heat exchange tubes is connected to the water header, and the other end of the heat exchange tubes is connected to the steam-water header; the water header is rotatably connected to a water inlet rotary joint, and the steam-water header is rotatably connected to a steam outlet rotary joint, and the rotary connections are sealed with a graphite material; the steam-water header and the water header rotate together with the heat exchanger cylinder; The heat exchanger cylinder has an inner cylinder wall and an outer cylinder wall, the inner cylinder wall and the heat exchange tubes form a heat exchange space, and a heat insulating material is filled between the inner cylinder wall and the outer cylinder wall; end plates are arranged on the inner cylinder wall, the outer cylinder wall and the end, and a discharge scraper is welded circumferentially between the end plate and the flange tube sheet on the discharge side.

12. The recuperative waste heat recovery system for hot solid slag particles according to claim 11.

13. The superheater includes, from top to bottom, a preheating module, a superheating module, and a combustion module; The combustion module includes a furnace, a burner, a flue gas circulation pipeline, and a circulation fan; the superheat module having a steam inlet, a steam inlet header, a steam outlet header, a steam outlet, and a superheater tube set; The steam outlet pipeline of the steam drum is connected to the steam inlet of the superheating module, and the saturated steam in the steam drum is transported into the steam inlet header through the steam inlet of the superheating module, and the saturated steam is uniformly distributed to the superheating tube set by the steam inlet header; The preheating module has a water inlet, a water inlet header, a water outlet header, a water outlet, and a preheating tube set; the outlet pipeline of the water supply pump is connected to the water inlet, and cold water in a water tank is transported into the water inlet header through the water inlet, and the cold water is uniformly distributed to the preheating tube set by the water inlet header; the flue gas after heat exchange in the superheating module flows upward through the preheating module, heats the cold water in the preheating tube set, and is collected by the water outlet header on the preheating module, and then the water outlet on the water outlet header is connected to the water inlet pipe of the steam drum, and hot water is transported into the steam drum.

13. The recuperative waste heat recovery system for hot solid slag particles according to claim 12.

14. The heat exchanger has a cylinder, the slag particle inlet and the slag particle outlet are respectively arranged at the top and bottom of the cylinder, the upper part of one side wall of the cylinder is arranged with an air outlet, and the lower part of the other side wall is arranged with an air inlet pipeline and a fan; preferably, a guide plate for uniformly guiding the flow of slag particles is arranged at the upper part inside the cylinder; preferably, an air distribution device is arranged at the lower part inside the cylinder, a recuperative waste heat recovery system for high-temperature solid slag particles according to any one of claims 1 to 3.

15. 4. The recuperative waste heat recovery system for high-temperature solid slag particles according to claim 1, wherein the heat exchanger has a metal shell-and-tube structure, the interior of which is divided into an upper and lower superheating section and an evaporating section, a first set of heat exchange tubes is disposed in the superheating section, and a second set of heat exchange tubes is disposed in the evaporating section, respectively, an inlet end of the first set of heat exchange tubes is connected to the saturated steam outlet of the steam drum, and an outlet end of the first set of heat exchange tubes is connected to a steam pipe network through a pipeline via a buffer tank, an inlet end of the second set of heat exchange tubes is connected to the saturated water outlet of the steam drum, and an outlet end of the second set of heat exchange tubes is connected to the saturated steam-water mixture inlet of the steam drum, and the heat exchanger comprises guide plates arranged vertically at a distance from each other and a material distribution chute arranged below the slag inlet, and the guide plates are arranged with through holes for the heat exchange tubes to pass through.

16. The heat exchanger further includes a disturbing rod inserted between the first heat exchange tube and the second heat exchange tube, one end of the disturbing rod being fixed to a fixed base and the other end of the disturbing rod extending outside the heat exchanger; disturbing arms are arranged on a rod body of the disturbing rod at intervals in the axial direction, and the axes of the disturbing arms and the axis of the disturbing rod form an angle; preferably, adjacent disturbing arms are arranged in an antisymmetrical manner; a drive device, the output end of the drive device being connected to an end of the disturbance rod extending outside the heat exchanger; 7. The recuperative waste heat recovery system for high temperature solid slag particles according to claim 6.

17. 8. The recuperative waste heat recovery system for high temperature solid slag particles according to claim 7, wherein said driving device is of the worm and worm wheel type, said worm wheel being coaxially connected to the end of said disturbing rod.

18. 15. The recuperative waste heat recovery system for high temperature solid slag particles according to claim 1, further comprising: at least one high temperature storage tank disposed between the granulation device and the recuperative heat exchanger, wherein an inlet connected to the slag outlet of the granulation device is disposed at the top of the high temperature storage tank, and an outlet connected to the slag particle inlet of the heat exchanger is disposed at the bottom of the high temperature storage tank; a lower part of one side wall of the high temperature storage tank is provided with an air inlet, an air inlet pipeline, and a fan, while an upper part of the opposite side wall is provided with an air outlet, the air outlet being connected to an inlet end of a dust collector via a pipeline, and the outlet of the dust collector is connected to the waste heat recovery equipment via a pipeline; preferably, a temperature detection device is installed in the pipeline connected to the dust collector; preferably, an air distribution equipment connected to the air inlet pipeline is disposed at the bottom of the high temperature storage tank; and more preferably, a filter screen, a heat insulating material, and an outer shell are disposed on the inside and outside of the side wall of the high temperature storage tank.

19. The recuperative waste heat recovery system for high-temperature solid slag particles according to any one of claims 1 to 4 or 14, wherein the waste heat recovery equipment further comprises a superheater and / or an evaporator, the inlet of the superheater being connected to the saturated steam outlet of the steam drum and the outlet of the superheater being connected to a steam pipeline network; the inlet of the evaporator being connected to the water tank and the outlet of the evaporator being connected to the water inlet of the steam drum.

20. 20. The recuperative waste heat recovery system for high-temperature solid slag particles as described in claim 19, wherein the superheater and the evaporator are arranged in a sealed container, and an air inlet is arranged in the sealed container and connected to the outlet of a dust collector via a pipeline; the outlet of the sealed container is connected to an air purifier via a pipeline and a fan; preferably, the evaporator and the superheater adopt a coil structure; and preferably, a water treatment device is further included between the evaporator and the water tank.

21. The gas-quench granulation device comprises: A granulation chamber having a box structure, a molten slag inlet is disposed at the top of the granulation chamber, and a molten slag chute is disposed above the molten slag inlet; a slag particle outlet is disposed at the bottom of the granulation chamber; a high-pressure nozzle arranged on a side wall of the granulation chamber, the outlet of the high-pressure nozzle facing the molten slag inlet, and an air outlet, a dust collector and a fan arranged on the upper part of the other side wall of the granulation chamber; preferably, the high-pressure nozzle is a Laval nozzle; A recuperative waste heat recovery system for high temperature solid slag particles according to any one of claims 1 to 20.

22. The gas-water granulation device comprises: A granulation chamber having a box structure, a molten slag inlet is disposed at the top of the granulation chamber, and a molten slag chute is disposed above the molten slag inlet; a slag particle outlet is disposed at the bottom of the granulation chamber; The granulation chamber has a side wall with a high-pressure nozzle, the outlet of which faces the molten slag inlet, and the other side wall of the granulation chamber has an upper portion with a gas-water outlet, a filter, a gas-water separator and a fan, and the high-pressure nozzle is a spray nozzle or a gas-liquid two-fluid nozzle. A recuperative waste heat recovery system for high temperature solid slag particles according to any one of claims 1 to 20.

23. The rotating cup granulation device comprises: A granulation chamber having a box structure, the granulation chamber has a molten slag inlet at the top and a molten slag particle outlet at the bottom, an air inlet, an air inlet pipeline and a fan at the bottom of one side wall of the granulation chamber, and an air outlet, an air outlet pipeline, a dust collector and a fan at the top of the other side wall of the granulation chamber; a rotary motor disposed at the center of the granulation chamber; a rotary cup disposed at an output end of the rotary motor; A recuperative waste heat recovery system for high temperature solid slag particles according to any one of claims 1 to 20.

24. 1. A recuperative waste heat recovery method for high temperature solid slag particles, comprising the steps of: a) introducing molten slag into a granulation device for granulating molten slag to obtain slag particles, in which the air in the granulation process exchanges heat with the molten slag and is discharged through a dust collector and a fan; preferably, the granulation process employs gas-quenching granulation, gas-water granulation or rotating cup granulation; b) introducing the slag particles into a rolling recuperative heat exchanger, wherein the slag particles perform indirect contact heat exchange with water or steam from a steam drum via a heat exchange tube set, and the water or steam absorbs heat to generate high-temperature water, saturated steam, or superheated steam; c) sending the heat-exchanged slag particles via a conveyor; A recuperative waste heat recovery method for said high temperature solid slag particles.

25. 25. The recuperative waste heat recovery method for high-temperature solid slag particles according to claim 24, wherein in step b), the slag particles undergo indirect contact heat exchange with the water or steam from the steam drum via the heat exchange tube set and / or the cylinder heat exchange tube sleeve and the core-shaft heat exchange tube; the heat-exchanged slag particles are pushed down to the conveyor by a spiral plate and discharged via the conveyor.

26. 25. The recuperative waste heat recovery method for high-temperature solid slag particles according to claim 24, wherein in step b), the slag particles fall uniformly under the action of the guide plate of the recuperative heat exchanger, and during the falling process, they come into contact with air blown out from an air distribution device arranged at the bottom of the recuperative heat exchanger to exchange heat with the air.

27. 25. The recuperative waste heat recovery method for high temperature solid slag particles according to claim 24, wherein in step b), the saturated water from the steam drum enters the second heat exchange tube of the evaporation section of the recuperative heat exchanger, and becomes a saturated water-steam mixture after heat exchange with the high temperature slag particles, and then returns to the steam drum via a pipeline to achieve separation of steam and water; the saturated steam in the steam drum flows into the first heat exchange tube of the superheating section of the recuperative heat exchanger under a pressure difference, and forms superheated steam after heat exchange with the slag particles, and then connects to a steam pipe network via a buffer tank via a pipeline; preferably, when the slag flow rate is less than a set value, the steam pipeline of the superheating section is closed.

28. 25. The recuperative waste heat recovery method for high-temperature solid slag particles according to claim 24, wherein before step b), the slag particles first enter a high-temperature storage tank for temporary storage, and then enter the recuperative heat exchanger; during the temporary storage of the slag particles in the high-temperature storage tank, the hot air generated in the high-temperature storage tank is filtered by a dust collector and then sent to a waste heat recovery facility for heat exchange; preferably, multiple high-temperature storage tanks are adopted and arranged in parallel.

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