Waste heat recovery method for fused calcium carbide (2023)

[0004] The temperature of the molten calcium carbide released from the furnace is as high as 1800-1900 degrees, with high heat enthalpy and high heat; at present, in the calcium carbide production plant, after the calcium carbide in the molten state is discharged from the furnace, it is placed in the air for a long time to be cooled naturally or forced to cool by blasting. It is unreasonable to let a large amount of heat energy be dissipated arbitrarily

Its main disadvantages are that the heat of dissolution (latent heat) released when the molten calcium carbide is solidified and the heat (sensible heat) released during the cooling process after solidification have not been recycled; the first is that it takes a long time to cool naturally and the production efficiency is low; and Because the solidification cooling process is carried out i...

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[0021] refer to Figure 1 ~ Figure 3 , the present invention is a method for recovering residual heat from molten calcium carbide, comprising the following steps: 1. Carrying out forced air cooling to the molten calcium carbide to recover heat, and controlling the flow rate of the air to achieve that the calcium carbide releases heat evenly in the process of forced air cooling Second, the air heated by calcium carbide is used to generate stable high-temperature and high-pressure steam. The present invention achieves the effect of uniform heat release of calcium carbide by forced air cooling and controlling the size of the air flow, and solves the problems that the natural cooling takes too long and the waste heat of calcium carbide cannot be recycled. figure 1 ; Solve the problem of discontinuous and uneven heat release of ordinary forced air-cooled calcium carbide, which is not conducive to the recovery and utilization of waste heat. figure 2 The difference between ordinary forced air cooling and natural cooling is mainly that the cooling time is shortened, and the temperature change curve and heat release curve are basically the same.

[0022] In this embodiment, step 1 includes two sub-steps: a high-temperature heat exchange stage and a low-temperature heat exchange stage. The high-temperature heat exchange stage and the low-temperature heat exchange stage are respectively subjected to forced air cooling in two independent boxes. By controlling the size of the air flow To achieve the purpose of calcium carbide releasing heat evenly in the process of forced air cooling, the calcium carbide just out of the furnace first enters the box in the high-temperature heat exchange stage for heat exchange, and...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

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[0021] refer to Figure 1 ~ Figure 3 , the present invention is a method for recovering waste heat from molten calcium carbide, comprising the following steps: 1. Carrying out forced air cooling to the molten calcium carbide, recovering heat, and controlling the flow rate of the air to achieve that the calcium carbide evenly releases heat in the process of forced air cooling Second, the air heated by calcium carbide is used to generate stable high-temperature and high-pressure steam. The present invention achieves the effect of uniform heat release of calcium carbide by forced air cooling and controlling the size of the air flow, and solves the problems that the natural cooling takes too long and the waste heat of calcium carbide cannot be recycled. figure 1; Solve the problem of discontinuous and uneven heat release of ordinary forced air-cooled calcium carbide, which is not conducive to the recovery and utilization of waste heat. figure 2 The difference between ordinary forced air cooling and natural cooling is mainly that the cooling time is shortened, and the temperature change curve and heat release curve are basically the same.

[0022] In this embodiment, step 1 includes two sub-steps: a high-temperature heat exchange stage and a low-temperature heat exchange stage. The high-temperature heat exchange stage and the low-temperature heat exchange stage are respectively subjected to forced air cooling in two independent boxes. By controlling the size of the air flow To achieve the purpose of calcium carbide releasing heat evenly in the process of forced air cooling, the calcium carbide just out of the furnace first enters the box in the high-temperature heat exchange stage for heat exchange, and then enters the box in the low-temperature heat exchange stage for heat exchange. Calcium carbide in the hot stage can be directly removed from the pot and loaded into the car. To realize the above steps, two sets of calcium carbide trolleys (for transferring calcium carbide) need to be configured, one set is in the high-temperature heat exchange stage, and the other set is in the low-temperature heat exchange stage. Control and stabilize steam flow; through high temperature heat exchange stage and low temperature heat exchange stage, reduce heat fluctuation. In this embodiment, in step 1, the circulating fan is used for forced air cooling, and the rotating speed of the circulating fan is controlled by a frequency conversion controller; specifically, the frequency conversion controller has a built-in control algorithm. , the specific heat coefficient of solid calcium carbide, heat transfer parameters, and the heat transfer and heat transfer parameters of the vessel containing calcium carbide are designed after the information, so as to achieve the purpose of calcium carbide releasing heat evenly in the process of forced air cooling. The technical effect achieved by the algorithm can be found in image 3 , it can be seen that when the molten calcium carbide is forced to cool under this method, the heat released is very uniform, and it can be used as a stable heat source, which is convenient for the follow-up process.

[0023] Wherein, in the second step, a boiler or a heat exchanger or a combination of the two is used to generate stable high-temperature and high-pressure steam. In this embodiment, the coil heat exchanger is preferably used for heat exchange, and the heat exchange efficiency is relatively high.

[0024] The above-mentioned embodiments are only preferred versions of the present invention, and the present invention also has other embodiments. Those skilled in the art can also make equivalent modifications or replacements without departing from the spirit of the present invention, and these equivalent modifications or replacements are all included within the scope set by the claims of the present application.