CN115638667A - A waste heat power generation and combined heat and power generation device and system using the cooling wind of the I-type furnace - Google Patents

Abstract

The invention discloses a waste heat power generation and combined heat and power generation device utilizing the cooling wind of an I-type furnace, comprising: a heat dissipation module, a semiconductor thermoelectric power generation module, a heat transfer module, a heat collection module, a power storage-power supply module, and a heating module; The heat dissipation module, the semiconductor thermoelectric power generation module, the heat transfer module and the heat collection module are superimposed and arranged on both sides of the reduction furnace in sequence, and the modules are fixedly connected by bolts; the heat dissipation module is arranged at the air inlet of the reduction furnace, and the heat The collection module is set at the air outlet of the reduction furnace, and the heating module is connected to the air outlet of the reduction furnace; the invention uses the cooling wind of the metallurgical reduction furnace as a high-temperature heat source, changes the traditional form of waste heat recovery and utilization, and avoids the waste heat caused by impurities in the flue gas. The resulting equipment corrosion saves the investment in the construction of exhaust gas treatment equipment; at the same time, the invention uses the semiconductor thermoelectric power generation module to reuse the waste heat of equipment cooling, taking into account the cogeneration of heat and power, and reduces energy waste to the greatest extent.

Description

A waste heat power generation and combined heat and power generation device and system using the cooling wind of an I-type furnace

technical field

The invention belongs to the technical field of waste heat utilization of metallurgical process boilers, and in particular relates to a waste heat power generation and cogeneration device and system utilizing cooling air from a Type I furnace.

Background technique

At present, primary energy consumption is huge, especially in the metallurgical industry and coal-fired power plants. The use of a large number of boilers generates a lot of heat. In the actual production process, a lot of this part of heat is not recycled, but is directly discharged into the atmosphere, which not only leads to waste of energy, but also produces thermal pollution. It will inevitably cause power shortage and affect production and life. Therefore, the efficient and feasible green transformation and upgrading of waste heat recovery and utilization enterprises is of great significance.

In recent years, domestic existing technologies for utilization of flue gas waste heat in metal smelting, sintering and other processes are relatively mature, but there is a lack of utilization of medium and high temperature waste heat in molten pool smelting, smelting reduction and other processes. At present, most of the large-scale reduction furnaces represented by Isa furnace adopt the form of blast heat dissipation. The cooling air enters from the cooling air duct at the upper part of the furnace body, exchanges heat with the reduction furnace, and then flows out from the lower air duct. This part of heat is directly discharged without waste heat collection and utilization, resulting in energy waste. At present, most of the equipment aimed at utilizing the waste heat of the magnesia thermal reduction furnace adopts a heat extraction device using water as a heat medium. The heat exchanger pipe of the device is arranged in the flue. The heat exchange pipe enters water at normal temperature, absorbs heat and enters the evaporator to release heat, generates saturated steam to drive the steam turbine to generate electricity, and returns to the heat extraction device under the drive of the pump to complete the cycle after cooling down. . However, the waste heat boiler is generally large in size and difficult to install near the reduction furnace. Considering the temperature drop caused by the actual layout, it not only reduces the waste heat utilization efficiency, but also increases the construction and maintenance costs. If a small-tonnage boiler is used, a large amount of waste heat will be directly discharged problem of walking.

The application number is 202010837765.6 for an invention patent application titled "Solid Oxide Fuel Cell-Semiconductor Thermoelectric Composite Power Generation System Based on Heat Pipe Heat Dissipation". connect. Although it can use the waste heat of the fuel cell, it needs an additional fuel pump and reformer, which is complicated in structure and inconvenient to install.

The application number is 201720984316.8, an invention patent titled "an energy-saving boiler waste heat power generation device", which installs semiconductor thermoelectric power generation sheets on both sides of the boiler wall. This installation method integrates the power generation sheet with the boiler. Once a failure occurs, it needs to be shut down for maintenance, which will affect the production cycle of the boiler.

The application number is 202210160984.4, which is an invention patent application titled "an energy storage device for boiler waste heat recovery". The device is equipped with two closed structures that can be connected to each other, and a steam component is installed in the structure, and the heat of the steam is used to drive the semiconductor thermoelectric power generation device to generate electricity. . However, the device is bulky and inconvenient to install and disassemble, and it also needs to set up a water tank to convert water into steam and generate vapor pressure inside the structure, which is likely to affect the life of the boiler. In addition, the device does not consider the secondary waste heat of steam Resource recovery, waste heat utilization efficiency is limited.

Therefore, in order to overcome the above-mentioned deficiencies in the prior art and improve the utilization rate of the waste heat from the cooling air of the reduction furnace, the inventor provides a waste heat power generation and cogeneration device and system using the cooling air of the I-type furnace.

Contents of the invention

In order to solve the above technical problems, the present invention provides a waste heat power generation and cogeneration device and system using the cooling air of the I-type furnace, which is used to solve the waste heat resource waste problem caused by the direct discharge of the cooling air of the reduction furnace.

In order to achieve the above technical effects, the present invention is achieved through the following technical solutions: a waste heat power generation and combined heat and power generation device utilizing the cooling air of the I-type furnace, including: a heat dissipation module, a semiconductor thermoelectric power generation module, a heat transfer module, and a heat collection module , storage-power supply module, heating module;

The heat dissipation module, the semiconductor thermoelectric power generation module, the heat transfer module, and the heat collection module are successively superimposed on both sides of the reduction furnace, and the modules are fixedly connected by bolts; the heat dissipation module is arranged at the air inlet of the reduction furnace , the heat collection module is arranged at the air outlet of the reduction furnace, the heating module is connected to the air outlet of the reduction furnace; the heat dissipation module maintains a low temperature under the action of the cold air in the air inlet, and the heat collection module collects The heat carried in the high-temperature air is transferred to the heat transfer module. The heat transfer module and the heat dissipation module act on the two ends of the semiconductor thermoelectric power generation module with the hot end and the cold end respectively to promote its power generation. The semiconductor thermoelectric power generation module passes the wire electrically connected to the power storage-power supply module;

Further, the heating module includes a diversion air pipe and a waste heat boiler, one end of the diversion air pipe is fixedly connected to the air outlet of the reduction furnace, and the other end is fixedly connected to the waste heat boiler, and the waste heat boiler is connected to the user terminal through a pipe, providing users Heating; the air outlet of the air outlet is installed with an air outlet ventilation net;

Further, the heat dissipation module includes a rectangular steel channel and straight ribs with equal cross-section at the cold end, and the straight ribs with equal cross-section at the cold end are staggered and fixedly arranged on the side wall of the rectangular steel channel; the bottom of the rectangular steel channel is provided with a threaded hole foot, Used for bolting semiconductor thermoelectric power generation modules;

Further, the semiconductor thermoelectric power generation module includes a semiconductor thermoelectric power generation sheet, a diversion groove, and a thermoelectric component shell; the thermoelectric power generation sheets and diversion grooves are arranged alternately; and threaded hole feet for the heat transfer module;

Further, the heat transfer module includes a steel-water heat pipe body, a heat pipe end cover, a heat pipe "cold end" base, and an ultra-fine glass felt for heat preservation; the heat pipe end cover and the heat pipe "cold end" base are respectively set With the two ends of the steel-water heat pipe main body, the top of the heat transfer module is fixed with a threaded hole foot seat connected by bolts to the semiconductor thermoelectric power generation module;

Further, the heat collection module includes a heat collector base, copper heat pipes, and parallel aluminum fin sheets, the copper heat pipes are welded to the heat collector base, and the parallel aluminum fin sheets are welded between the copper heat pipes;

The beneficial effects of the present invention are:

The invention uses the cooling air of the metallurgical reduction furnace as a high-temperature heat source, changes the traditional form of waste heat recovery and utilization, avoids equipment corrosion caused by flue gas impurities, and saves the construction investment of tail gas treatment equipment; at the same time, the invention uses semiconductor thermoelectric power generation modules Reusing the waste heat of equipment cooling, taking into account the cogeneration of heat and power, minimizes energy waste.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that are required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is a kind of overall structural schematic diagram of waste heat power generation and combined heat and power generation device utilizing I-type furnace cooling wind;

Fig. 2 is a schematic diagram of the internal structure of a heat dissipation module of a waste heat power generation and combined heat and power generation device utilizing the cooling air of a type I furnace;

Fig. 3 is a side view of a heat dissipation module of a waste heat power generation and combined heat and power cogeneration device utilizing the cooling air of the I-type furnace;

Fig. 4 is a schematic diagram of the bottom structure of a heat dissipation module of a waste heat power generation and combined heat and power cogeneration device utilizing the cooling air of the I-type furnace;

Fig. 5 is a front sectional view of a semiconductor thermoelectric power generation module of a waste heat power generation and combined heat and power cogeneration device utilizing the cooling wind of an I-type furnace;

Fig. 6 is a side view sectional view of a semiconductor thermoelectric power generation module of a waste heat power generation and combined heat and power cogeneration device utilizing the cooling wind of an I-type furnace;

Fig. 7 is a front half-sectional view of a heat transfer module of a waste heat power generation and combined heat and power cogeneration device utilizing the cooling air of the I-type furnace;

Fig. 8 is a side view half-sectional view of a heat transfer module of a waste heat power generation and combined heat and power cogeneration device utilizing the cooling air of the I-type furnace;

Fig. 9 is a front sectional view of a heat collection module of a waste heat power generation and combined heat and power cogeneration device utilizing the cooling wind of the I-type furnace;

Fig. 10 is a side sectional view of a heat collection module of a waste heat power generation and combined heat and power cogeneration device utilizing the cooling air of the I-type furnace;

Fig. 11 is a schematic diagram of a heating system of a waste heat power generation and combined heat and power generation device utilizing the cooling air of the I-type furnace.

In the accompanying drawings, the parts represented by each label are as follows:

1. Air intake pipe; 2. Blower; 3. Motor; 4. Air intake duct; 5. Heat dissipation module; 6. Semiconductor thermoelectric power generation module; 7. Waste heat boiler; 8. User; 9. Heat transfer module; 10. Heat collection Module; 11. Diversion duct; 12. Air outlet; 13. Ventilation net; 14. Cooling duct of reduction furnace; 15. Reduction furnace; 16. Connecting wire; 17. Battery; 18. Rectangular steel channel; 19. Threaded hole feet; 20. Straight ribs with equal cross-section at the cold end; 21. Semiconductor thermoelectric power generation sheet; 22. Diversion groove; 23. Temperature difference component shell; Heat pipe end cover; 29. Heat pipe "cold end" base; 30. Collector base; 31. Copper heat pipe; 32. Parallel aluminum fin sheet; 33. Boiler room outer wall; 34. Boiler furnace wall; 35. Heating water tank ; 36, drainage air duct; 37, user terminal.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Example 1

Referring to Figure 1, a waste heat power generation and cogeneration device using the cooling wind of a type I furnace includes: a heat dissipation module 5, a semiconductor thermoelectric power generation module 6, a heat transfer module 9, a heat collection module 10, and a power storage-power supply module. module, heating module;

The heat dissipation module 5, the semiconductor thermoelectric power generation module 6, the heat transfer module 9, and the heat collection module 10 are successively superimposed on both sides of the reduction furnace 15, and the modules are fixedly connected by bolts; the heat dissipation module 5 is arranged on the reduction furnace 15. The heat collection module 10 is arranged at the air inlet channel 4 of the furnace 15, and the heat collection module 10 is arranged at the air outlet channel 12 of the reduction furnace 15, and the heating module is connected to the air outlet channel 12 of the reduction furnace 15; The low temperature is maintained under the action of air, and the heat collection module 10 collects the heat carried in the high-temperature air in the air duct 12 and transfers it to the heat transfer module 9. The heat transfer module 9 and the heat dissipation module 5 act as hot ends and cold ends respectively. Prompting it to generate electricity at both ends of the semiconductor thermoelectric power generation module 6, the semiconductor thermoelectric power generation module 6 is electrically connected to the power storage-power supply module through wires;

The heating module includes a diversion air pipe 11 and a waste heat boiler 7, one end of the diversion air pipe 11 is fixedly connected to the air outlet 12 of the reduction furnace 15, and the other end is fixedly connected to the waste heat boiler, and the waste heat boiler is connected to the user 8 through a pipe , to heat the user 8.

Example 2

This embodiment is a preferred implementation form of the cooling module 5:

Referring to Fig. 2 to Fig. 4, the rectangular steel channel 18 in the heat dissipation module 5 is made of cold-rolled steel plate, which plays a role of stable support and heat dissipation for the straight rib 20 of equal cross-section at the cold end, and the straight rib of equal cross-section at the cold end 20 is used as a heat sink, and the material is brass, which is installed in the air inlet 4 of the cooling air of the reduction furnace 15, and utilizes the low-temperature air blown in by the blower 2 to dissipate heat.

The lower surface of the rectangular steel channel 18 in the heat dissipation module 5 is provided with a threaded connection port, which forms a threaded connection with the semiconductor thermoelectric power generation module 6, and the cold wall surface is directly in contact with the cold end of the semiconductor thermoelectric power generation chip 21, and evenly smears heat-conducting silicone grease in the middle.

The heat dissipation module 5 is welded as a whole by the straight rib 20 of equal section at the cold end and the rectangular steel channel 18, and the material of the straight rib 20 at the cold end is brass;

Its size is width × depth × thickness = 85mm × 40mm × 2mm. It adopts a staggered side-by-side installation method. The installation interval of each straight rib with equal cross-section is 15-20mm. The material of the rectangular steel channel 18 is aluminum alloy with a thickness of 2mm. It is wide * high * deep = 145mm * 110mm * 40mm, installed in the air inlet duct 4. The four corners of the contact surface with the air inlet duct 4 and the cold end of the semiconductor thermoelectric power generation component extend outwards with a foot seat of length × width × thickness = 30mm × 30mm × 2mm, tapped with threaded holes for threaded connection of components . The connecting parts are M10 ordinary hexagonal bolts, and the material is Q235. One bolt is equipped with double nuts for anti-loosening.

Example 3

This embodiment is a preferred implementation form of the semiconductor thermoelectric power generation module 6:

5 to 6, the semiconductor thermoelectric power generation module 6 includes a semiconductor thermoelectric power generation sheet 21, a diversion groove 22, and a thermoelectric component housing 23; the thermoelectric power generation sheets and the diversion groove 22 are arranged alternately; The two ends of the power generation module 6 are fixedly provided with threaded hole feet 19 for connecting the heat dissipation module 5 and the heat transfer module 9 with bolts; diversion grooves 22 are reserved in the middle of each semiconductor thermoelectric power generation sheet 21 to enhance heat transfer efficiency;

The hot end of the semiconductor thermoelectric power generation sheet 21 in the semiconductor thermoelectric power generation module 6 is bonded to the heat pipe "cold end" base 29 of the heat transfer module 9 and evenly coated with thermal conductive silicone grease, and the heat pipe "cold end" base 29 is fixed to the thermoelectric component shell by bolts 23 on;

The semiconductor thermoelectric power generation module 6 includes three sets of thermoelectric power generation components. A single component is composed of 63 p-type β-Zn ₄ Sb ₃ &n-type n-CoSb ₃ semiconductor thermoelectric power generation chips 21, and the size of each chip is length×width×thickness= 40mm×40mm×3.4mm; the space between the power generation sheets is 5mm and the diversion groove 22 is used to improve the heat transfer efficiency in the module.

Example 4

This embodiment is a preferred implementation form of the heat transfer module 9:

7 to 8, the heat transfer module 9 includes a steel-water heat pipe body 26, a heat pipe end cover 28, a heat pipe "cold end" base 29, and an ultrafine glass felt 27 for heat preservation; the heat pipe The end cover 28 and the "cold end" base 29 of the heat pipe are respectively arranged on the two ends of the steel-water heat pipe main body 26, and the top of the heat transfer module 9 is fixed with a threaded hole foot 19 connected by a bolt to the semiconductor thermoelectric power generation module 6; The whole module is placed in the ABS plastic shell;

There are 3 steel-water heat pipes with outer diameter d _o =25 mm and inner diameter d _i =21 mm.

Example 5

This embodiment is a preferred implementation form of the heat collection module 10:

9 to 10, the heat collection module 10 includes a heat collector base 30, a copper heat pipe 31, a parallel aluminum fin sheet 32, the copper heat pipe 31 is welded to the heat collector base 30, and the parallel aluminum fin sheet 32 is welded between the copper heat pipes 31, each piece is about 1mm thick, and the spacing between the pieces is 5mm; in this way, on the premise of ensuring sufficient heat exchange efficiency, it also has sufficient strength, so that the entire tower column can withstand the impact of the cooling wind.

The overall height of the heat collection module 10 is 120mm, the thickness of the base 30 of the heat collector is 30mm, the height of the tower body is 100mm, and the base, heat pipes and stainless steel sheets are combined into a whole by welding.

The copper heat pipes 31 are arranged in two rows, with 6 in each row and 12 in total. The whole copper pipe is ring-shaped, with a diameter of 15mm and a diameter of 45mm at the elbow. The 30 size material of the heat collector base is made of stainless steel, the size is height × width × depth = 100mm × 100mm × 30mm, and there are feet extending outwards with length × style × thickness = 30mm × 30mm × 2mm, and tapped with threaded holes for Threaded connection of components. One end of the copper pipe is buried in the base with a depth of 15mm. The parallel aluminum fin sheet 32 and the copper tube are combined in the form of welding, the material is carbon steel, and the thickness of a single piece is 1mm. In addition, the outer periphery of the base is wrapped with thermal insulation material, which reduces the heat loss and avoids the occurrence of scald incidents.

Example 6

This embodiment is a kind of operation principle of waste heat power generation and combined heat and power generation device utilizing the cooling wind of the I-type furnace;

During the working process of the system, outside air at normal temperature enters the blower 2 through the intake pipe 1, driven by the motor 3, the low-temperature air is compressed, and blows into the cooling air duct 14 of the reduction furnace from the air intake duct 4. The incoming cold air flows through the heat dissipation module 5 installed at the air inlet duct 4 to maintain a lower temperature of the module, and then absorbs the heat radiated from the reduction furnace 15 in the air duct to become high-temperature air. The lower part of the heat dissipation module 5 is in close contact with the upper end of the semiconductor thermoelectric power generation module 6, and becomes the "cold end" of the thermoelectric power generation assembly. When the high-temperature air flows out from the air outlet channel 12, it has a temperature of about 310° C., exchanges heat with the heat collection module 10 arranged inside the air outlet channel 12, and then flows out. In addition, an air outlet ventilation net 13 is installed at the air outlet of the air outlet duct 12 . The heat collection module 10 collects the heat carried in the high-temperature air and transfers it to the heat transfer module 9, and then the heat transfer module 9 brings the heat to the lower end of the semiconductor thermoelectric power generation assembly, so that the upper end of the assembly is maintained as the cold end of the low-temperature air , the lower end receives heat from a high-temperature heat source and becomes the hot end, forming a thermoelectric potential and completing the main part of waste heat power generation. The electricity generated by the system can be delivered to the storage battery 17 through the connecting wire 16 for storage, can also be directly supplied to the motor 3 as a supplement to the power supply of the motor 3, and can also be supplied to the waste heat boiler 7 for supplementary heat. The hot air discharged from the air outlet 12 is connected to the waste heat boiler 7 through the guide air pipe 11 for secondary waste heat utilization, and the water in the heating water tank 35 is boiled and supplied to the user terminal 37 on site to meet the hot water demand of the factory area.

The working process of the waste heat power generation and combined heat and power system is as follows: the air is blown into the cooling air duct 14 of the reduction furnace by the blower 2 to absorb the radiant heat of the reduction furnace 15, and the heated air first performs heat exchange in the heat collection module 10, The heat is transferred to the semiconductor thermoelectric power generation module 6 for power generation, and then the air enters the waste heat boiler 7 through the diversion air pipe 36 for secondary heat exchange to achieve secondary utilization of waste heat resources.

To sum up, the present invention uses the cooling air of the metallurgical reduction furnace as a high-temperature heat source, changes the traditional form of waste heat recovery and utilization, avoids equipment corrosion caused by flue gas impurities, and saves the construction investment of tail gas treatment equipment; at the same time, the present invention The semiconductor thermoelectric power generation module is used to reuse the waste heat of equipment cooling, taking into account the cogeneration of heat and power, which minimizes energy waste.

In the description of this specification, descriptions with reference to the terms "one embodiment", "example", "specific example" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment of the present invention. In an embodiment or example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are only to help illustrate the invention. The preferred embodiments are not exhaustive in all detail, nor are the inventions limited to specific embodiments described. Obviously, many modifications and variations can be made based on the contents of this specification. This description selects and specifically describes these embodiments in order to better explain the principle and practical application of the present invention, so that those skilled in the art can well understand and utilize the present invention. The invention is to be limited only by the claims, along with their full scope and equivalents.

Claims (6)

1. A cogeneration device utilizing waste heat of cooling air of an I-type furnace is characterized by comprising: the system comprises a heat dissipation module, a semiconductor temperature difference power generation module, a heat transfer module, a heat collection module, an electric power storage-supply module and a heating module;

the heat dissipation module, the semiconductor thermoelectric generation module, the heat transfer module and the heat collection module are sequentially overlapped and arranged on two sides of the reduction furnace, and the modules are fixedly connected through bolts; the heat dissipation module is arranged at an air inlet channel of the reduction furnace, the heat collection module is arranged at an air outlet channel of the reduction furnace, and the heating module is connected with the air outlet channel of the reduction furnace; the heat dissipation module maintains low temperature under the action of cold air in the air inlet duct, the heat collection module collects heat carried in high-temperature air in the air outlet duct and transfers the heat to the heat transfer module, the heat transfer module and the heat dissipation module respectively act on two ends of the semiconductor thermoelectric power generation module through a hot end and a cold end to enable the semiconductor thermoelectric power generation module to generate power, and the semiconductor thermoelectric power generation module is electrically connected to the power storage-supply module through a lead.

2. The cogeneration device of claim 1, wherein the heating module comprises a diversion air duct and a waste heat boiler, one end of the diversion air duct is fixedly connected with the air outlet channel of the reduction furnace, the other end of the diversion air duct is fixedly connected with the waste heat boiler, and the waste heat boiler is connected to a user side through a pipeline to supply heat to the user; and an air outlet ventilation net is arranged at the air port of the air outlet channel.

3. The cogeneration device of claim 2, wherein the heat dissipation module comprises a rectangular steel channel and cold end uniform-section straight ribs, and the cold end uniform-section straight ribs are fixedly arranged on the side wall of the rectangular steel channel in a staggered manner; and a threaded hole foot seat is arranged at the bottom of the rectangular steel channel and used for connecting the semiconductor temperature difference power generation module through bolts.

4. The cogeneration device according to claim 3, wherein said semiconductor thermoelectric generation module comprises semiconductor thermoelectric generation fins, a guide groove, and a thermoelectric module housing; the thermoelectric generation pieces and the diversion trenches are arranged in a staggered manner; and threaded hole foot seats for connecting the heat dissipation module and the heat transfer module through bolts are fixedly arranged at two ends of the semiconductor thermoelectric generation module.

5. The cogeneration device according to claim 4, wherein said heat transfer module comprises a steel-water heat pipe main body, a heat pipe end cap, a heat pipe "cold end" base, and a super fine glass felt for heat insulation; the heat pipe end cover and the heat pipe cold end base are respectively arranged at two ends of the steel-water heat pipe main body, and the top end of the heat transfer module is fixedly provided with a threaded hole foot seat connected with the semiconductor temperature difference power generation module through a bolt.

6. The cogeneration apparatus according to claim 1, wherein said heat collection module comprises a heat collector base, a copper heat pipe, and a parallel aluminum finned sheet, wherein the copper heat pipe is welded to the heat collector base, and the parallel aluminum finned sheet is welded between the copper heat pipes.

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