Waste heat recycling device, system and method

Abstract

The invention relates to the technical field of heat recovery equipment, in particular to a waste heat recycling device, system and method, and solves the technical problem that a waste heat recovery mode capable of coping with suspended matters such as mineral wool fibers in slag flushing water is lacked in the prior art. According to the technical scheme, heat exchange of a desalted water cold fluid flow is formed through the first baffle pipe, the second baffle pipe and the longitudinal baffle pipe, the incrustation intercepting assembly is used for intercepting and attaching suspended solids such as mineral wool fibers at the far-point end of the heat exchange unit bin, the incrustation intercepting assembly can be detached, the frame spiral component can be rapidly detached, rapid cleaning is facilitated, and the service life of the heat exchange unit bin is prolonged. The waste heat recovery system configuration position slag flushing hot water pool is connected with a slag flushing water inlet; one group of slag flushing water outlets are connected to a slag flushing cold water pool, and the other group of slag flushing water outlets are connected with a steam water heater which is used for providing a heat supply source for a heat user side; the demineralized water enters the cold fluid inlet as cold fluid; and the cold fluid enters the heat user side from the cold fluid outlet after heat exchange.

Description

Technical Field

[0001] This invention relates to the field of heat recovery equipment technology, and in particular to a waste heat recovery and utilization device, system and method. Background Technology

[0002] The high-temperature slag produced by blast furnace smelting is quenched in water to produce high-temperature slag called flushing water. The temperature of flushing water is approximately 70-90℃ and contains a large amount of residual heat. Currently, the composition of flushing water is complex, with a large amount of suspended solids, especially mineral wool fibers, which easily clog the processing equipment. The residual heat of flushing water cannot be directly utilized. In the current method, the waste heat recovery of blast furnace slag flushing water mostly adopts a process that combines horizontal sedimentation with high-efficiency self-cleaning filters. A steel wire mesh is installed on the slag flushing water return pipeline. The water flows through the sedimentation tank with a filter layer of pebbles and steel wire mesh. After filtration, most of the impurities remain in the sedimentation tank and then seep into the clear water tank. The water is then pressurized by a water pump and supplied to heating users. A high-precision self-cleaning filter is installed at the water pump outlet to remove fine suspended solids and ensure the smooth flow of heating water. Because the total dissolved solids in the slag flushing water are too high, the water balance is easily disrupted. Substances with low solubility are prone to precipitate and form loose scale. High-speed filters cannot fully filter the suspended solids in the slag flushing water. In addition, the water flow velocity at the heating terminal is low, which can easily cause blockage of the terminal pipes and filters. Therefore, a waste heat recovery and utilization device suitable for slag flushing water is needed.

[0003] Chinese invention application, publication number CN105806107A, entitled "A Slag Flushing Water Heat Exchanger", discloses a slag flushing water heat exchanger. The slag discharge pipe under the slag flushing water pipe box can easily discharge sewage and sludge accumulated at the bottom of the water tank, reducing the frequency of opening the box for slag cleaning and effectively reducing blockage. A contactless slag flushing water flow channel is formed between the heat transfer plates. After the internal water is discharged through the slag discharge pipe, the flat covers on both sides of the slag flushing water pipe box can be easily opened to clear sludge and blockage. However, it is still insufficient to deal with suspended matter such as mineral wool fibers. Summary of the Invention

[0004] The present invention aims to solve the technical problem of the lack of a waste heat recovery method in the prior art that can handle suspended matter such as mineral wool fibers in slag flushing water, and provides a waste heat recovery and utilization device, system and method.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: Firstly, a waste heat recovery and utilization device includes: main housing; The main shell has a cold water tank, and a set of heat exchange unit compartments are connected to both sides of the cold water tank. The cold water tank is divided into an outlet water tank and an inlet water tank; A first baffle pipe forms a baffle in the heat exchange unit bin and communicates the outlet water tank and the inlet water tank; A second baffle pipe forms a baffle in the heat exchange unit bin and communicates the outlet water tank and the inlet water tank; The first baffle pipe and the second baffle pipe each have a transverse baffle pipe; The second baffle pipe has a longitudinal baffle pipe in communication with the transverse baffle pipe of the second baffle pipe, and the longitudinal baffle pipe is located at an end of the heat exchange unit bin away from the cold water tank; and A scale interception assembly, one set of the scale interception assembly is detachably connected to one side of each set of the heat exchange unit bin away from the cold water tank, and the scale interception assembly is closed by a head part; The scale interception assembly has a plurality of frame spiral parts arranged adjacent to the longitudinal baffle pipe; The heat exchange unit bin is provided with a baffle plate; The heat exchange unit bin has a deslagging water inlet and a deslagging water outlet.

[0006] Specifically, the outlet water tank is located above the inlet water tank, and a heat insulation layer is arranged between the outlet water tank and the inlet water tank; The outlet water tank is connected to a cold fluid outlet; The inlet water tank is connected to a cold fluid inlet; The deslagging water inlet is arranged adjacent to the cold fluid outlet; The deslagging water outlet is connected below an extended shell of the heat exchange unit bin.

[0007] Specifically, the extended shell has a composite interface flange, and the composite interface flange has an outer ring connecting hole and an inner ring connecting hole; The extended shell forms an interception inner cavity.

[0008] Specifically, the scale interception assembly has: An inner sleeve; The inner sleeve has an inner extension body connected to an inner interface flange with a diameter larger than an inner diameter of the inner extension body, and the inner interface flange is connected to the inner ring connecting hole of the composite interface flange, so that the inner extension body is located in the interception inner cavity.

[0009] Specifically, the upper convex side of the cross section of the inner extension body is connected to a plurality of threaded sleeves; A side of the inner extension body away from the threaded sleeve is connected to a pull ring.

[0010] Specifically, the frame spiral part includes: A threaded connecting rod capable of being screwed into the threaded hole of the threaded sleeve; The threaded connecting rod is connected with a spiral arrangement rod which is perpendicular to the longitudinal baffle tube; Spiral fins are evenly arranged on the spiral arrangement rod; A cylindrical frame is connected with the spiral arrangement rod and the spiral fins are located in the cylindrical frame, and the cylindrical frame forms a hollow space.

[0011] Specifically, the head part comprises: A primary head part has a butt flange on one side, which is connected with the outer ring connecting hole of the composite interface flange; The butt flange and the composite interface flange are respectively provided with a sealing groove, and the sealing groove is filled with a sealing pad; The primary head part has an opening part, and the diameter of the opening part is greater than the diameter of the end flange of the extended shell; A secondary head cover is connected to the opening part.

[0012] Specifically, a baffle sleeve connecting strip hole is formed on the baffle plate, which is used to adapt to the baffle spacing of the first baffle tube and the second baffle tube.

[0013] Further, a waste heat recycling system applying the waste heat recycling device comprises: A deslagging hot water pool is connected with the deslagging water inlet; One group of the deslagging water outlets is connected to a deslagging cold water pool, and another group of the deslagging water outlets is connected to a steam water heater, which is used to provide a heat source for a heat user end; Desalted water enters the cold fluid inlet as a cold fluid; The cold fluid exchanges heat and then enters the heat user end from the cold fluid outlet; Then, a waste heat recycling method applying the waste heat recycling system is provided, and when the waste heat recycling system is stopped, after the deslagging water is discharged through the blowdown port, the secondary head cover is first disassembled, the inner sleeve is disassembled, the inner extension body is pulled out through the pull ring, and the spiral fins and the cylindrical frame are cleaned.

[0014] The present application has the following beneficial effects: The first baffle tube, the second baffle tube and the longitudinal baffle tube form a heat exchange of the desalted water cold fluid flow process, the water scale interception assembly is arranged at the far point end of the heat exchange unit bin to intercept and adhere suspended matters such as mineral wool fibers, the water scale interception assembly can be disassembled, the frame spiral part can be quickly disassembled, and quick cleaning is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0015] The application will be described in further detail below with reference to the drawings and specific embodiments.

[0016] Figure 1 A structure diagram of the waste heat recovery device of the application; Figure 2 A structure diagram of the composite interface flange of the application; Figure 3 A structure diagram of the head component of the application; Figure 4 A structure diagram of the scale interception assembly of the application; Figure 5 A structure diagram of the sealing groove of the application; Figure 6 A diagram of the baffle sleeve jointing strip hole of the application; Figure 7 A diagram of the waste heat recovery system of the application.

[0017] The reference signs in the drawings represent: Cold water tank 1, heat exchange unit bin 2, water outlet tank 11, water inlet tank 12; First baffle pipe 100, second baffle pipe 200, longitudinal baffle pipe 300; Scale interception assembly 30, head component 40, baffle plate 50, deslagging water inlet 3, deslagging water outlet 4; Cold fluid outlet 5, cold fluid inlet 6, extended shell 21; Composite interface flange 22, outer ring connecting hole 221, inner ring connecting hole 222, interception inner cavity 210; Inner sleeve 31, inner extended body 32, inner interface flange 321, composite interface flange 22, inner ring connecting hole 222; Threaded sleeve 322, pull ring 323, threaded connecting rod 330, spiral arrangement rod 331, spiral piece 332, cylindrical frame 333; Primary head 41, butt joint flange 401, sealing groove 402, sealing gasket 403; Open part 404, secondary head cover 42, baffle sleeve jointing strip hole 51; Deslagging hot water pool 1001, deslagging cold water pool 1002, steam water heater 1003, heat user end 1004, blowdown 7. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the protection scope of the present application. It should be noted that, in the present application, in order to facilitate description, the "left side" in the current view is the "first end", the "right side" is the "second end", the "upper side" is the "first end", and the "lower side" is the "second end". The purpose of such description is to clearly express the technical solutions, and should not be understood as an improper limitation on the technical solutions of the present application.

[0019] The present application aims to solve the technical problem of lacking a waste heat recovery mode that can cope with suspended matters such as mineral wool fibers in the slag flushing water in the prior art, and provides a waste heat recovery and utilization device, system and method.

[0020] A waste heat recovery and utilization device, in one specific embodiment, please refer to Figure 1 The device includes a main shell; The main shell has a cold water tank 1, and a group of heat exchange unit compartments 2 are connected to the two sides of the cold water tank 1 respectively, and the cold water tank 1 and the two sides of the heat exchange unit compartments 2 are integrated; the cold water tank 1 is divided into a water outlet tank 11 and a water inlet tank 12, and the water outlet tank 11 and the water inlet tank 12 and a first baffle tube 100, a second baffle tube 200 and a longitudinal baffle tube 300 jointly form a "tube side" for desalted water heat exchange; The first baffle tube 100 forms a baffle in the heat exchange unit compartment 2 and connects the water outlet tank 11 and the water inlet tank 12; The second baffle tube 200 also forms a baffle in the heat exchange unit compartment 2 and connects the water outlet tank 11 and the water inlet tank 12; The first baffle tube 100 and the second baffle tube 200 each have a transverse baffle tube to increase heat exchange efficiency; The second baffle tube 200 has a longitudinal baffle tube 300 connected to the transverse baffle tube of the second baffle tube 200, the longitudinal baffle tube 300 is located at the end of the heat exchange unit compartment 2 away from the cold water tank 1, and the longitudinal baffle tube 300 forms a detachable connection with the second baffle tube 200, the longitudinal baffle tube 300 forms heat exchange near a scale interception assembly 30, and due to the longitudinal arrangement, heat exchange can be performed near the scale interception assembly 30, and the scale interception assembly 30 is used to block and attach suspended matters such as mineral wool fibers; The scale interception assembly 30 is detachable, and each group of heat exchange unit compartments 2 is detachably connected to a group of scale interception assemblies 30 on the side away from the cold water tank 1, and the scale interception assembly 30 is closed by a head part 40; The scale interception assembly 30 has a plurality of frame spiral components arranged adjacent to the longitudinal baffle pipe 300, mainly relying on the frame spiral components to intercept and attach suspended matters such as mineral wool fibers, and concentrating the suspended matters such as mineral wool fibers in the extended shell 21 outside the heat exchange unit bin 2. In actual configuration, the heat exchange unit bin 2 is provided with a baffle plate 50. The heat exchange unit bin 2 has a deslagging water inlet 3 and a deslagging water outlet 4. Figure 1 As shown in the drawings, the deslagging water inlet 3 is two groups, and the deslagging water outlet 4 is two groups. The technical scheme forms heat exchange of desalted water cold fluid process through the first baffle pipe 100, the second baffle pipe 200 and the longitudinal baffle pipe 300, the scale interception assembly 30 is used as an interception and attachment of suspended matters such as mineral wool fibers at the far end of the heat exchange unit bin 2, the scale interception assembly 30 can be disassembled, and the frame spiral component can be quickly disassembled, which is convenient for quick cleaning.

[0021] In one specific embodiment, please refer to Figure 1 As shown in the drawings, the water outlet tank 11 is located above the water inlet tank 12, and a heat insulation layer is arranged between the water outlet tank 11 and the water inlet tank 12; the water outlet tank 11 is connected with the cold fluid outlet 5; the water inlet tank 12 is connected with the cold fluid inlet 6; the deslagging water inlet 3 is arranged adjacent to the cold fluid outlet 5, and synchronous heat preservation can be realized after the heat preservation layer is arranged, so as to avoid heat loss; the deslagging water outlet 4 is connected below the extended shell 21 of the heat exchange unit bin 2 and adjacent to the longitudinal baffle pipe 300.

[0022] In one specific embodiment, please refer to Figure 2 、 3 As shown in the drawings, the extended shell 21 has a composite interface flange 22, and the composite interface flange 22 has an outer ring connecting hole 221 and an inner ring connecting hole 222; the extended shell 21 forms an interception inner cavity 210 to increase the space for interception and attachment.

[0023] In one specific embodiment, please refer to Figure 2 、 3 As shown in the drawings, in a specific configuration mode, the scale interception assembly 30 has an inner sleeve 31. The inner sleeve 31 has an inner extension body 32, and the inner extension body 32 is connected with an inner interface flange 321 having a diameter larger than the inner diameter of the inner extension body 32, and the inner interface flange 321 is connected with the inner ring connecting hole 222 of the composite interface flange 22, so that the inner extension body 32 is located in the interception inner cavity 210.

[0024] In one specific embodiment, please refer to Figure 2 、 3As shown, the inner extension body 32 is connected with a plurality of threaded sockets 322 on the upper arc side of the cross section; the inner extension body 32 is connected with a pull ring 323 on the side away from the threaded socket 322; when the machine is stopped, the pull ring 323 is connected with a hand-operated hoist or a steel wire rope after being disassembled and opened, and the inner socket 31 is pulled out after the bolts are removed; In one embodiment, please refer to Figure 4 As shown, the frame screw component includes: a threaded connecting rod 330 capable of being screwed into the threaded hole of the threaded socket 322; the threaded connecting rod 330 is connected with a spiral arrangement rod 331, and the spiral arrangement rod 331 is perpendicular to the longitudinal baffle pipe 300; the spiral arrangement rod 331 is uniformly provided with spiral fins 332; a cylindrical frame 333 is connected with the spiral arrangement rod 331, and the spiral fins 332 are located in the cylindrical frame 333, and the cylindrical frame 333 forms a hollow space.

[0025] In one embodiment, please refer to Figure 2 、 3 As shown, the head component 40 includes: a primary head 41, and the primary head 41 has a butt flange 401 on one side, and the butt flange 401 is connected with the outer ring connecting hole 221 of the composite interface flange 22. The butt flange 401 and the composite interface flange 22 are respectively provided with a sealing groove 402, and the sealing groove 402 is filled with a sealing gasket 403. The primary head 41 has an opening part 404, and the diameter of the opening part 404 is greater than the diameter of the end flange of the extension shell 21. A secondary head cover 42 is connected to the opening part 404.

[0026] In one embodiment, please refer to Figure 6 As shown, the baffle plate 50 is provided with a baffle sleeve connecting strip hole 51, and the baffle sleeve connecting strip hole 51 is used to adapt to the baffle spacing of the first baffle pipe 100 and the second baffle pipe 200.

[0027] In one embodiment, please refer to Figure 7 、 1 As shown, a waste heat recycling system applying the waste heat recycling device includes: The deslagging hot water pool 1001 is connected with the deslagging water inlet 3. A group of deslagging water outlets 4 are connected to the deslagging cold water pool 1002, and another group of deslagging water outlets 4 are connected to the steam water heater 1003, which is used to provide a heat source to the heat user end 1004. The desalted water enters the cold fluid inlet 6 as a cold fluid; The cold fluid exchanges heat and then enters the heat user end 1004 from the cold fluid outlet 5; (1) Compared with the current slag flushing water recycling facilities, a waste heat recycling system is suitable for the modification of the existing slag flushing system, without setting high-efficiency filter and other equipment for treating impurities in the blast furnace slag flushing water, and the heat recovery efficiency in the slag water is high, which saves the initial investment and the operation cost in the later period; The added waste heat recovery device has no any influence on the original slag flushing system, recovers the waste heat of the blast furnace slag flushing water, can save energy and protect the environment, can reduce the cooling tower, and can also perform rapid cleaning.

[0028] Process equipment selection conditions: the design operation pressure of the slag flushing water system is 0.4 MPa; the design water quantity of the blast furnace slag flushing is 2600 m 3 / h (primary water), the design operation temperature is 90℃ / 55℃, the design pressure drop is 156kPa; the design water quantity of the heating water is 3125 m 3 / h (secondary water), the design operation temperature is 50℃ / 85℃, the design operation pressure is 0.40 MPa, and the design pressure drop is 153kPa.

[0029] In one specific embodiment, referring to Figure 1 Fig. 7, a waste heat recycling method, applying a waste heat recycling system, when the waste heat recycling system is stopped, the slag flushing water is discharged through the blowdown port 7, then the secondary head cover 42 is disassembled, the inner adapter 31 is disassembled, the inner extension body 32 is pulled out through the pull ring 323, and the spiral blade 332 and the cylindrical frame 333 are cleaned.

[0030] Obviously, the above embodiments are only examples for clearly illustrating, and are not limited to the embodiments. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments do not need to be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A waste heat recovery and utilization device, characterized in that, include: main housing; The main shell has a cold water tank (1), and a set of heat exchange unit compartments (2) are connected to both sides of the cold water tank (1). The cold water tank (1) is divided into an outlet tank (11) and an inlet tank (12). The first baffle tube (100) forms a baffle in the heat exchange unit compartment (2) and connects the outlet tank (11) and the inlet tank (12). The second baffle tube (200) forms a baffle in the heat exchange unit compartment (2) and connects the outlet tank (11) and the inlet tank (12). Both the first baffle tube (100) and the second baffle tube (200) have transverse baffle tubes; The second baffle (200) has a longitudinal baffle (300) communicating with the transverse baffle of the second baffle (200), the longitudinal baffle (300) being located at the end of the heat exchange unit compartment (2) away from the cold water tank (1); and A scale interception assembly (30) is detachably connected to the side of each heat exchange unit compartment (2) away from the cold water tank (1), and the scale interception assembly (30) is closed by a head member (40). The scale interception component (30) has multiple frame spiral components, which are arranged adjacent to the longitudinal baffle tube (300). The heat exchange unit compartment (2) is equipped with baffles (50); The heat exchange unit compartment (2) has a slag flushing water inlet (3) and a slag flushing water outlet (4).

2. The waste heat recovery and utilization device as described in claim 1, characterized in that, The outlet tank (11) is located above the inlet tank (12), and a heat insulation layer is provided between the outlet tank (11) and the inlet tank (12); The water outlet tank (11) is connected to the cold fluid outlet (5); The water inlet tank (12) is connected to the cold fluid inlet (6); The slag flushing water inlet (3) is arranged adjacent to the cold fluid outlet (5); The flushing water outlet (4) is connected to the lower part of the extended shell (21) of the heat exchange unit compartment (2).

3. The waste heat recovery and utilization device as described in claim 2, characterized in that, The extended housing (21) has a composite interface flange (22), which has an outer ring connection hole (221) and an inner ring connection hole (222). The extended housing (21) forms an interception cavity (210).

4. The waste heat recovery and utilization device as described in claim 3, characterized in that, The scale interception component (30) has: internal socket (31); The inner sleeve (31) has an inner extension (32) connected to an inner flange (321) with a diameter larger than the inner diameter of the inner extension (32). The inner flange (321) is connected to the inner ring connection hole (222) of the composite interface flange (22) so that the inner extension (32) is located in the interception cavity (210).

5. The waste heat recovery and utilization device as described in claim 4, characterized in that, Multiple threaded sleeves (322) are connected to the upper arc side of the inner extension body (32) section. The inner extension (32) is connected to a pull ring (323) on the side away from the threaded sleeve (322).

6. The waste heat recovery and utilization device as described in claim 5, characterized in that, The frame spiral component includes: A threaded connecting rod (330) is capable of being screwed into the threaded hole of the threaded sleeve (322); The threaded connecting rod (330) is connected to a spiral arrangement rod (331), and the spiral arrangement rod (331) is perpendicular to the longitudinal baffle tube (300). Spiral blades (332) are evenly distributed on the spiral arrangement rod (331); A cylindrical frame (333) is connected to the spiral arrangement rod (331), and the spiral blade (332) is located inside the cylindrical frame (333), which forms a hollow space.

7. The waste heat recovery and utilization device as described in claim 6, characterized in that, The head component (40) includes: The primary sealing head (41) has a mating flange (401) on one side, which is connected to the outer ring connection hole (221) of the composite interface flange (22); The docking flange (401) and the composite interface flange (22) are respectively provided with sealing grooves (402), and the sealing grooves (402) are filled with sealing gaskets (403). The primary sealing head (41) has an opening (404) with a diameter larger than that of the end flange of the extension housing (21). A secondary end cap (42) is attached to the opening (404).

8. The waste heat recovery and utilization device as described in claim 7, characterized in that, The baffle plate (50) has a baffle sleeve strip hole (51) which is used to adapt to the baffle spacing of the first baffle tube (100) and the second baffle tube (200).

9. A waste heat recovery and utilization system, using the waste heat recovery and utilization device as described in claim 8, characterized in that, include: The slag flushing hot water tank (1001) is connected to the slag flushing water inlet (3); One set of the flushing water outlets (4) is connected to the flushing cold water tank (1002), and another set of the flushing water outlets (4) is connected to the steam water heater (1003), which is used to provide a heat source to the heat user (1004). Demineralized water enters the cold fluid inlet (6) as a cold fluid. After heat exchange, the cold fluid enters the heat user terminal (1004) from the cold fluid outlet (5).

10. A method for waste heat recovery and utilization, using the waste heat recovery and utilization system as described in claim 9, characterized in that, When the waste heat recovery system is shut down, after the flushing water is discharged through the drain outlet (7), the secondary end cap (42) is first removed, the inner sleeve (31) is removed, and the inner extension body (32) is pulled out through the pull ring (323) to clean the spiral blade (332) and the cylindrical frame (333).

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