Calcium carbide waste heat recovery device

Abstract

The utility model relates to the technical field of molten calcium carbide heat recovery, in particular to a calcium carbide waste heat recovery device. The device comprises a calcium carbide pot, a furnace discharging trolley, an energy conversion device, a heat exchange device a and a heat exchange device b, wherein the calcium carbide pot is used for containing high-temperature calcium carbide, the high-temperature calcium carbide comprises molten calcium carbide and solidified calcium carbide, the discharging trolley is used for conveying the molten calcium carbide into the heat exchange device a, the heat exchange device a cools the molten high-temperature calcium carbide into the solidified calcium carbide, and after the calcium carbide is cooled and solidified, the calcium carbide is moved out of the calcium carbide pot and continuously conveyed into the heat exchange device b; the heat exchange device b is used for cooling the cured calcium carbide again; according to the calcium carbide waste heat recovery device, a supercritical CO2 heat exchange medium is designed and developed to recover heat in the molten calcium carbide cooling process, and a high-temperature supercritical medium is generated and used for generating power or heating other media.

Description

Technical Field

[0001] The utility model relates to the technical field of heat recovery of molten calcium carbide, in particular to a calcium carbide waste heat recovery device. Background Art

[0002] Calcium carbide (CaC2) is an important chemical raw material. It appears as a gray, brownish-yellow, or black solid mass. Industrial products are gray-black masses with a purple or gray cross-section. Calcium carbide has a relative density of 2.22 and a melting point of 2300°C.

[0003] In the traditional calcium carbide production process, calcium carbide is discharged from the furnace intermittently. During discharge, a cart carrying the calcium carbide pot is guided to the furnace outlet by a traction device. Molten calcium carbide flows into each pot, where the temperature of the liquid calcium carbide exceeds 2000°C. After discharge, the pots, filled with molten calcium carbide, are hauled into a cooling workshop for cooling. When the surface temperature drops to around 200°C, the calcium carbide is formed and removed from the pot for further cooling in a storage workshop. The entire cooling process is natural, and all heat is dissipated, resulting in energy waste and hindering energy conservation and emission reduction. Furthermore, the high temperature environment is a pollutant, making the cooling workshop unsuitable for long-term work.

[0004] In the existing patented technology "Method for collecting and reusing waste heat during the solidification process of liquid calcium carbide (Patent Announcement No.: CN201110080034.2)", liquid calcium carbide and water exchange heat through radiation. If water leaks, the reaction between calcium carbide and water will cause a violent explosion, posing a huge safety hazard.

[0005] In the "Calcium Carbide Furnace Waste Heat Recovery System (Patent Announcement No.: CN200720191198.1)", the calcium carbide discharged from the furnace is cooled by a hot air tunnel kiln. Cold air is introduced each time, and the air thermal enthalpy is not high, which consumes a lot of electricity. At the same time, the high-temperature calcium carbide reacts with the nitrogen in the air, reducing the quality of the calcium carbide.

[0006] In view of this, we propose a calcium carbide waste heat recovery device and utilization method to improve the deficiencies in the existing technology. Summary of the Invention

[0007] The purpose of the utility model is to provide a calcium carbide waste heat recovery device to solve the problems raised in the above background technology.

[0008] To achieve the above purpose, the utility model provides a calcium carbide waste heat recovery device, including a calcium carbide pot, a furnace trolley, an energy conversion device, a heat exchange device a and a heat exchange device b;

[0009] Among them, the calcium carbide pot is used to hold high-temperature calcium carbide, and the high-temperature calcium carbide includes molten calcium carbide and solidified calcium carbide. The furnace-outlet trolley is used to transport the molten calcium carbide into the heat exchange device a, and the heat exchange device a cools the liquid high-temperature calcium carbide into solidified calcium carbide. The furnace-outlet trolley can transport the solidified calcium carbide into the heat exchange device b, and the heat exchange device b is used to cool the solidified calcium carbide again.

[0010] As a further improvement of the present technical solution, the outer walls of the heat exchange device a and the heat exchange device b are both provided with thermal insulation materials, and the interiors of the heat exchange device a and the heat exchange device b are both provided with heat exchange tube groups.

[0011] As a further improvement of the present technical solution, the heat exchange device a and the heat exchange device b are both provided with heat exchange tube groups inside, and baffle doors are provided on both sides. Valve a is provided on the outside of the heat exchange device a, and valve b is provided on the outside of the heat exchange device b. The heat exchange tube groups include heat exchange tubes and manifolds.

[0012] As a further improvement of the present technical solution, the energy conversion device includes a generator set and a heat exchange device, the generator set includes a cooler, and the heat exchange device includes a pump.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] This calcium carbide waste heat recovery device was designed and developed to recover heat from the cooling process of molten calcium carbide using a supercritical CO2 heat exchange medium. This produces a high-temperature supercritical medium that is used for power generation or heating other media, recovering energy and improving workers' working conditions. Furthermore, because the supercritical CO2 heat exchange medium does not chemically react with calcium carbide, the quality of the calcium carbide and the safety of the calcium carbide cooling process are guaranteed. This system can recycle waste heat from the calcium carbide cooling process without changing existing calcium carbide production methods and ensuring its quality. It can also reduce the temperature of the cooling workshop and the dust content in the air, improving the workshop working environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a process flow chart of an embodiment of the utility model;

[0016] Figure 2 This is a working principle diagram of the heat exchanger a in the embodiment of the present utility model;

[0017] Figure 3 This is a working principle diagram of the heat exchanger b in the embodiment of the present utility model;

[0018] Figure 4 This is a flow chart of the device according to an embodiment of the present utility model;

[0019] The meaning of each number in the figure is:

[0020] 100, calcium carbide pot; 101, solidified calcium carbide; 110, furnace unloading trolley; 120, heat exchange device a; 130, heat exchange device b; 140, insulation material; 150, heat exchange tube group; 151, heat exchange tube; 152, header; 160, baffle door; 170, valve a; 171, valve b;

[0021] 200. Cooler; 210. Compressor; 220. Pump; 250. Energy conversion device. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0023] See also Figures 1-4 As shown, this embodiment provides a calcium carbide waste heat recovery device, including a calcium carbide pot 100, a furnace trolley 110, an energy conversion device 250, a heat exchange device a120 and a heat exchange device b130;

[0024] Among them, the calcium carbide pot is used to hold high-temperature calcium carbide, which includes molten calcium carbide and solidified calcium carbide 101. The furnace trolley 110 is used to transport the molten calcium carbide into the heat exchange device a120. The heat exchange device a120 cools the molten high-temperature calcium carbide into solidified calcium carbide 101. The furnace trolley 110 can transport the solidified calcium carbide 101 into the heat exchange device b130. The heat exchange device b130 is used to cool the solidified calcium carbide 101 again.

[0025] The outer walls of the heat exchange device a120 and the heat exchange device b130 are both provided with insulation materials 140, and the interiors of the heat exchange device a120 and the heat exchange device b130 are both provided with heat exchange tube groups 150.

[0026] Heat exchange device a120 and heat exchange device b130 are both internally provided with heat exchange tube groups 150, and baffle doors 160 are provided on both sides. A valve a170 is provided on the outside of heat exchange device a120, and a valve a171 is provided on the outside of heat exchange device b130. The heat exchange tube group 150 includes heat exchange tubes 151 and a header 152.

[0027] The energy conversion device 250 includes a generator set and a heat exchange device. The generator set includes a cooler 200 , and the heat exchange device includes a pump 220 .

[0028] What needs to be disclosed is: the outer shell of the solidified calcium carbide 101 and the core of the solidified calcium carbide 101 are still in a high-temperature state. After the high-temperature calcium carbide (divided into initial molten calcium carbide and solidified calcium carbide 101 after the initial cooling) enters the interior of the heat exchange device a120 and the heat exchange device b130 respectively, the baffle door 160 is closed to reduce the internal heat loss of the heat exchange device a120 and the heat exchange device b130.

[0029] Furthermore, the heat exchange tube group 150 exchanges heat for high-temperature calcium carbide in a manner including radiation heat exchange and convection heat exchange. The heat exchange medium in the heat exchange tube group 150 absorbs the heat released by the high-temperature calcium carbide, and the heat absorbed by the heat exchange medium is recycled and utilized through the energy conversion device 250.

[0030] Furthermore, the heat exchange medium is supercritical CO2, and the flow direction of the heat exchange medium is opposite to the direction of high-temperature calcium carbide in the heat exchange device a120 and the heat exchange device b130. The countercurrent heat exchange method makes the heat exchange efficiency of the heat exchange medium to the high-temperature calcium carbide higher;

[0031] It should be noted that under normal circumstances, heat exchanger a120 and heat exchanger b130 operate in series. High-temperature calcium carbide enters heat exchanger a120 first. Driven by compressor 210 or pump 220, supercritical CO2 heat exchange medium enters heat exchange tube assembly 150, absorbing heat released by the high-temperature calcium carbide in heat exchanger a120 and heat exchanger b130. After partially releasing heat, solidified calcium carbide 101 exits heat exchanger a120, removes the solidified calcium carbide from the calcium carbide pot 100, and enters heat exchanger b130 to continue releasing heat. After passing through heat exchanger b130, the calcium carbide cools down and enters the next production process, while the supercritical CO2 heat exchange medium completes its heat absorption process. Under special circumstances (such as during maintenance of heat exchanger a120 or heat exchanger b130), heat exchanger a120 and heat exchanger b130 can be switched via control valves 170 and 171 to exchange heat independently.

[0032] Next, a compressor 210 or a pump 220 is provided outside the heat exchange device a120 and the heat exchange device b130. When the high-temperature calcium carbide enters the heat exchange device a120, the compressor 210 or the pump 220 pushes the supercritical CO2 heat exchange medium into the heat exchange tube group 150.

[0033] In addition, the heat exchange device a120 and the heat exchange device b130 work in series under normal conditions, and can also work independently.

[0034] Finally, the supercritical CO2 heat exchange medium absorbs the heat of the high-temperature calcium carbide and enters the energy conversion device 250.

[0035] In summary, the working principle of this scheme is as follows: first, the molten calcium carbide taken out of the furnace is introduced into the calcium carbide pot 100, and the calcium carbide pot 100 filled with red-hot high-temperature liquid calcium carbide is transported by the furnace trolley 110 into the heat exchange device a120 placed on the track. After cooling to a solidified state in the heat exchange device a120, the calcium carbide pot 100 containing the solidified calcium carbide 101 is pulled out of the heat exchange device a120. The solidified calcium carbide 101 is crusted on the outside at this time, but the core temperature is still very high.

[0036] After the initial heat exchange is complete, the solidified calcium carbide 101 is removed from the calcium carbide pot 100 and placed on a trolley 110 for continued heat exchange in heat exchanger b 130. After the high-temperature calcium carbide enters heat exchangers a 120 and b 130, the damper door 160 is closed to minimize heat loss within heat exchangers a 120 and b 130.

[0037] When high-temperature calcium carbide enters heat exchanger a120 and heat exchanger b130, the supercritical CO2 heat exchange medium in heat exchange tube assembly 150 absorbs the heat released by the high-temperature calcium carbide primarily through radiation and convection. The heat absorbed by the supercritical CO2 heat exchange medium is then recycled through energy conversion device 250. If the high-temperature supercritical CO2 medium releases heat through power generation, it enters cooler 200 for cooling. The cooled supercritical CO2 medium is pressurized by compressor 210 and then recirculated into heat exchanger a120 and heat exchanger b130. If the high-temperature supercritical CO2 medium is used to heat other media (such as water) through heat exchange equipment, the supercritical CO2 medium, after releasing heat, is re-entered into heat exchanger a120 and heat exchanger b130 through pump 220 for recycling.

[0038] Through the above process, the heat contained in the high-temperature calcium carbide is continuously brought out for energy conversion.

[0039] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A calcium carbide waste heat recovery device, characterized in that: It includes an electric stone pot (100), a furnace unloading trolley (110), an energy conversion device (250), a heat exchange device a (120) and a heat exchange device b (130); The calcium carbide pot is used to hold high-temperature calcium carbide, and the high-temperature calcium carbide includes molten calcium carbide and solidified calcium carbide (101). The furnace-discharging trolley (110) is used to transport the molten calcium carbide into the heat exchange device a (120). The heat exchange device a (120) cools the molten high-temperature calcium carbide into solidified calcium carbide (101). The furnace-discharging trolley (110) can transport the solidified calcium carbide (101) into the heat exchange device b (130). The heat exchange device b (130) is used to cool the solidified calcium carbide (101) again.

2. The calcium carbide waste heat recovery device according to claim 1, characterized in that: The heat exchange medium is supercritical CO2.

3. The calcium carbide waste heat recovery device according to claim 1, characterized in that: The outer walls of the heat exchange device a (120) and the heat exchange device b (130) are both provided with a heat insulation material (140), and the interiors of the heat exchange device a (120) and the heat exchange device b (130) are both provided with a heat exchange tube group (150).

4. The calcium carbide waste heat recovery device according to claim 2, characterized in that: The heat exchange device a (120) and the heat exchange device b (130) are both provided with a heat exchange tube group (150) inside, and baffle doors (160) are provided on both sides. The heat exchange device a (120) is provided with a valve a (170) on the outside, and the heat exchange device b (130) is provided with a valve b (171) on the outside. The heat exchange tube group (150) includes a heat exchange tube (151) and a header (152).

5. The calcium carbide waste heat recovery device according to claim 1, characterized in that: The energy conversion device (250) comprises a generator set and a heat exchange device, the generator set comprises a cooler (200), and the heat exchange device comprises a pump (220).

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