Rotary kiln slag cooling system capable of recycling waste heat

Abstract

The utility model provides a rotary kiln slag cooling system capable of recovering waste heat, which relates to the technical field of waste heat recovery equipment, is used for dry cooling and waste heat recovery of rotary kiln slag, is particularly suitable for fine material slag of a rotary kiln, and comprises a cooling machine which comprises a slag inlet, a slag outlet, a cooling circulation inlet and a cooling circulation outlet, the kiln slag waste heat recovery device is reasonable in design, simple in principle and capable of effectively replacing an existing kiln slag wet treatment process, waste heat of kiln slag is recovered, waste of water resources can be effectively reduced, dust pollution is reduced or completely eradicated, the influence on the environment is reduced, and meanwhile the kiln slag waste heat recovery device is suitable for industrial production. And the subsequent kiln slag drying process is omitted, so that the treatment cost is reduced to a great extent, and the treatment period is well shortened.

Description

TECHNICAL FIELD

[0001] The utility model relates to a waste heat recovery equipment technical field, especially in a kind of rotary kiln slag cooling system of waste heat recovery. BACKGROUND

[0002] At present, kiln slag is usually treated by wet treatment method.When high-temperature kiln slag is discharged from the rotary kiln discharge port, it is often cooled by water flow to flush slag or water pool to immerse slag.However, this cooling method has many problems, resulting in the heat of high-temperature kiln slag being seriously wasted, and also causing great waste of water resources.In addition, it can also cause unorganized emission of smoke and steam, causing serious pollution to the environment.

[0003] Especially worth paying attention to is that for fine material kiln slag with small particle size, when performing conventional water flow to flush slag cooling, not only heat and water resources are wasted, but also mud water problem is brought to the cooling site, greatly increasing the cleaning cost of the site.When water pool is used to immerse slag for cooling, there is also the problem of mud slag settlement, so that the cooling water pool needs to be frequently cleaned, which further increases the cleaning cost. SUMMARY

[0004] In view of the problems in the background art, the utility model provides a rotary kiln slag cooling system capable of waste heat recovery.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] A rotary kiln slag cooling system capable of waste heat recovery is used for dry cooling and waste heat recovery of rotary kiln slag, and is especially suitable for fine material kiln slag of rotary kiln, comprising a cooling machine, characterized in that the cooling machine is a drum-type cooling machine, comprising a slag inlet, a slag outlet, a cooling circulation inlet and a cooling circulation outlet, a screening device is arranged at the slag inlet, the screening device is used for screening fine material kiln slag, the inlet thereof is communicated with the discharge port of the rotary kiln to receive kiln slag discharged from the rotary kiln, and the screening device comprises a fine material outlet, which is communicated with the slag inlet to input fine material kiln slag screened into the cooling machine, a conveyor is arranged at the slag outlet, the front end of the conveyor is communicated with the slag outlet, and the rear end thereof is communicated with a slag storage bin.

[0007] The cooling circulation inlet and the cooling circulation outlet are communicated through a cooling pipeline, and a circulating pump and a steam drum are arranged on the cooling pipeline.

[0008] Further, a combustion-supporting air duct is arranged at the conveyor, one end of the combustion-supporting air duct is communicated with the front end of the conveyor, the other end is communicated with the combustion-supporting air inlet of the rotary kiln, and a dust collector and an induced draft fan are arranged in the combustion-supporting air duct along the rotary kiln direction of the conveyor.

[0009] Further, the steam drum is connected with a steam output pipeline and a feedwater pipeline, the steam output pipeline outputs steam for heat recycling and / or heat storage, and the feedwater pipeline is provided with a feedwater pump for supplementing the heat exchange medium.

[0010] Further, the screening device further comprises a large block material outlet for discharging the screened large block kiln slag.

[0011] The technical effects and advantages of the present application are as follows:

[0012] The present application provides a rotary kiln slag cooling system capable of waste heat recovery, and relates to the technical field of waste heat recovery equipment, which is used for dry cooling and waste heat recovery of rotary kiln slag, especially fine material kiln slag of a rotary kiln, and comprises a cooling machine, wherein the cooling machine comprises a slag inlet, a slag outlet, a cooling circulation inlet and a cooling circulation outlet, a screening device is arranged at the slag inlet, and a conveyor is arranged at the slag outlet. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The present application is a schematic diagram.

[0014] Figure 2 The present application is a schematic diagram (embodiment 2, direct discharge).

[0015] In the drawings, the reference signs are as follows: 1, rotary kiln; 2, cooling machine; 3, slag inlet; 4, slag outlet; 5, cooling circulation inlet; 6, cooling circulation outlet; 7, screening device; 8, fine material outlet; 9, conveyor; 10, slag storage bin; 11, transportation equipment / vehicle; 12, cooling pipeline; 13, circulating pump; 14, steam drum; 15, combustion air duct; 16, dust collector; 17, induced draft fan; 18, steam output pipeline; 19, feedwater pipeline; 20, feedwater pump; 21, large block material outlet. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only 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 those skilled in the art without creative work fall within the protection scope of the present application.

[0017] Embodiment 1

[0018] As shown in the figure, the embodiment proposes a rotary kiln slag cooling system with waste heat recovery, which is used for dry cooling and waste heat recovery of the rotary kiln 1 slag, especially suitable for fine material kiln slag of the rotary kiln 1, and includes a cooler 2, characterized in that the cooler 2 is a drum cooler, which includes a slag inlet 3, a slag outlet 4, a cooling circulation inlet 5 and a cooling circulation outlet 6, and the slag inlet 3 is provided with a screening device 7 for screening fine material kiln slag, the inlet of which is communicated with the slag discharge port of the rotary kiln 1 to receive the kiln slag discharged from the rotary kiln 1, and the screening device 7 includes a fine material outlet 8 communicated with the slag inlet 3 to input the screened fine material kiln slag into the cooler 2, and the slag outlet 4 is provided with a conveyor 9, the front end of which is communicated with the slag outlet 4, and the rear end of which is communicated with a slag storage bin 10.

[0019] The cooling circulation inlet 5 and the cooling circulation outlet 6 are communicated through a cooling pipeline 12, and the cooling pipeline 12 is provided with a circulating pump 13 and a steam drum 14.

[0020] In operation, the rotary kiln 1 slag is first discharged into the screening device 7, and after screening, the fine material kiln slag is sent into the cooler 2, the cooler 2 is a drum cooler, and the fine material kiln slag rolls in the cooler 2 and gradually moves to the direction of the conveyor 9, during which the cooler 2 continuously exchanges heat (waste heat recovery), until the fine material kiln slag is discharged, at this time, the discharged fine material kiln slag with low waste heat utilization value is output through the conveyor 9 and collected in the slag storage bin 10, and then transported by the transport device / vehicle 11.

[0021] In waste heat recovery, the steam drum 14 contains saturated water, which enters the cooler 2 through the cooling pipeline 12, exchanges heat with the kiln slag through the drum wall, forms a steam-water mixture, and returns to the steam drum 14 through the cooling pipeline 12.

[0022] Embodiment 2

[0023] The embodiment proposes a rotary kiln slag cooling system with waste heat recovery, wherein, in order to meet the slag discharge requirement, the conveyor 9 of the embodiment is selected as a scale hopper conveyor, and a chain plate conveyor can also be selected, and at the same time, the conveyor 9 in the embodiment is provided with a combustion air duct 15 for secondary utilization of the waste heat of the fine material kiln slag with low waste heat utilization value, to provide combustion air with a certain temperature for the rotary kiln 1, to provide temperature compensation for the rotary kiln 1, specifically, one end of the combustion air duct 15 is communicated with the front end of the conveyor 9, and the other end is communicated with the combustion air inlet of the rotary kiln 1, and the combustion air duct 15 is sequentially provided with a dust remover 16 and an induced draft fan 17 along the conveyor 9 to the rotary kiln 1, and the dust remover 16 is used for filtering dust.

[0024] Embodiment 3

[0025] The present embodiment proposes a rotary kiln slag cooling system capable of waste heat recovery, wherein the steam drum 14 is connected with a steam output pipeline 18 and a water supply pipeline 19, the steam output pipeline 18 outputs steam for supplying heat equipment and / or heat storage equipment, which can be used for heat recycling and / or heat storage, in addition, the water supply pipeline 19 is provided with a water supply pump 20 for supplementing the heat exchange medium (water used in the present embodiment and the above-mentioned embodiments), and the water supply pump 20 can be controlled to open and close by the liquid level controller built-in the steam drum 14, so as to realize automatic water supply of the steam drum.

[0026] Embodiment 4

[0027] The present embodiment proposes a rotary kiln slag cooling system capable of waste heat recovery, wherein the screening equipment 7 further comprises a large block material outlet 21 for discharging the screened large block kiln slag;

[0028] Due to the cost and the limitation of the existing roller cooler specifications, the particle size of the fine material kiln slag that can be used for waste heat recovery is generally at most 100 mm, and it is appropriate to use 0-50-60 mm, so it is necessary to screen out the large block kiln slag, and the screened large block kiln slag also has waste heat recovery value;

[0029] Firstly, the screened large block kiln slag can be recovered by using a conventional method, or by using other recovery equipment suitable for large block kiln slag;

[0030] Secondly, the screened large block kiln slag is input into a high-temperature-resistant crusher for crushing treatment, and is conveyed back to the screening equipment 7 in a sealed manner through high-temperature-resistant conveying equipment, for secondary screening, and repeating the dry cooling waste heat recovery process of the fine material kiln slag, and in the process of high-temperature crushing and high-temperature conveying, there is also a dust problem, at this time, the combustion air duct 15 described in Embodiment 2 can be additionally provided on the high-temperature-resistant crusher and the high-temperature-resistant conveying equipment, to filter the dust and return to the rotary kiln in the form of combustion air.

[0031] In summary, the rotary kiln slag cooling system capable of waste heat recovery proposed in the above-mentioned embodiments has reasonable design, simple principle, and can effectively replace the existing kiln slag wet treatment process, recover the waste heat of the kiln slag, effectively reduce the waste of water resources, reduce or eliminate dust pollution, reduce the impact on the environment, at the same time, it also eliminates the process of drying the kiln slag, not only greatly reduces the treatment cost, but also greatly shortens the treatment period.

[0032] In the description of the utility model, unless another definite provision and limitation, the term "arrangement", "installation", "connection", "connect", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be direct connection, also can pass through intermediate medium indirectly connect, can be two element internal communication or two element's interaction relationship.For the ordinary skill in the art, the above-mentioned terms can be understood according to the specific meaning of the utility model.

[0033] The standard parts used in the utility model can be purchased from the market, and the special-shaped parts can be ordered according to the description and the drawings.

[0034] Although the embodiments of the utility model have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A rotary kiln slag cooling system with heat recovery, comprising a cooler (2), characterized in that, The cooling machine (2) is a drum-type cooling machine, comprising a slag inlet (3), a slag outlet (4), a cooling circulation inlet (5) and a cooling circulation outlet (6), the slag inlet (3) is provided with a screening device (7), the inlet of the screening device (7) is communicated with the slag discharge port of the rotary kiln (1), the screening device (7) comprises a fine material outlet (8), the fine material outlet (8) is communicated with the slag inlet (3), the slag outlet (4) is provided with a conveyor (9), the front end of the conveyor (9) is communicated with the slag outlet (4), and the rear end of the conveyor (9) is communicated with a slag storage bin (10). The cooling circulation inlet (5) and the cooling circulation outlet (6) are communicated through a cooling pipeline (12), the cooling pipeline (12) is provided with a circulating pump (13) and a steam drum (14).

2. A rotary kiln slag cooling system with recoverable waste heat according to claim 1, characterized in that, The conveyor (9) is provided with a combustion air duct (15), one end of the combustion air duct (15) is communicated with the front end of the conveyor (9), the other end of the combustion air duct (15) is communicated with the combustion air inlet of the rotary kiln (1), and the combustion air duct (15) is sequentially provided with a dust remover (16) and an induced draft fan (17) along the conveyor (9) to the rotary kiln (1).

3. A rotary kiln slag cooling system with residual heat recovery according to any one of claims 1-2, characterized in that, The steam drum (14) is connected with a steam output pipeline (18) and a feedwater pipeline (19), the steam output pipeline (18) outputs steam, and the feedwater pipeline (19) is provided with a feedwater pump (20).

4. A rotary kiln slag cooling system with recoverable waste heat according to claim 1, characterized in that, The screening device (7) further comprises a large block material outlet (21). The cooling machine (2) is a drum-type cooling machine, comprising a slag inlet (3), a slag outlet (4), a cooling circulation inlet (5) and a cooling circulation outlet (6), the slag inlet (3) is provided with a screening device (7), the inlet of the screening device (7) is communicated with the slag discharge port of the rotary kiln (1), the screening device (7) comprises a fine material outlet (8), the fine material outlet (8) is communicated with the slag inlet (3), the slag outlet (4) is provided with a conveyor (9), the front end of the conveyor (9) is communicated with the slag outlet (4), and the rear end of the conveyor (9) is communicated with a slag storage bin (10). The cooling circulation inlet (5) and the cooling circulation outlet (6) are communicated through a cooling pipeline (12), the cooling pipeline (12) is provided with a circulating pump (13) and a steam drum (14). The conveyor (9) is provided with a combustion air duct (15), one end of the combustion air duct (15) is communicated with the front end of the conveyor (9), the other end of the combustion air duct (15) is communicated with the combustion air inlet of the rotary kiln (1), and the combustion air duct (15) is sequentially provided with a dust remover (16) and an induced draft fan (17) along the conveyor (9) to the rotary kiln (1). The steam drum (14) is connected with a steam output pipeline (18) and a feedwater pipeline (19), the steam output pipeline (18) outputs steam, and the feedwater pipeline (19) is provided with a feedwater pump (20). The screening device (7) further comprises a large block material outlet (21). The cooling machine (2) is a drum-type cooling machine, comprising a slag inlet (3), a slag outlet (4), a cooling circulation inlet (5) and a cooling circulation outlet (6), the slag inlet (3) is provided with a screening device (7), the inlet of the screening device (7) is communicated with the slag discharge port of the rotary kiln (1), the screening device (7) comprises a fine material outlet (8), the fine

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