Hazardous waste salt carbonization treatment device

Abstract

The utility model relates to the technical field of hazardous waste salt treatment, in particular to a hazardous waste salt carbonization treatment device which comprises a heating furnace, a material bed which is used for placing waste salt and extends along a first direction is arranged in the heating furnace, and a rotating shaft which is rotatably arranged and extends along the first direction is arranged above the material bed in the heating furnace. The rotating axis of the rotating shaft is parallel to the first direction; the interior of the rotating shaft is hollow to form a channel for introducing steam; the rotating shaft is fixedly connected with a plurality of turning pieces which are sequentially distributed at intervals in the first direction; a cavity communicated with the channel is formed in the turning piece; the overturning piece is driven by the rotating shaft to overturn so as to be in contact with and overturn waste salt on the material bed; the heated overturning part can directly heat the hazardous waste salt when making contact with the hazardous waste salt so as to accelerate carbonization of the hazardous waste salt, meanwhile, the overturning part disturbs and stirs the hazardous waste salt, so that the hazardous waste salt can be fully heated for carbonization, and the heat efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hazardous waste salt treatment, and particularly relates to a carbonization treatment device for hazardous waste salt. Background Technique

[0002] The treatment of hazardous waste salt has always been a difficult problem. Due to the strong corrosiveness of chloride ions, it will cause damage to the kiln furnace, and the salt-containing hazardous waste (i.e., hazardous waste salt) is prone to generate more dioxins during the incineration process, which has a greater impact on the environment. Therefore, the commonly used incineration method cannot be used as the main treatment mode.

[0003] At present, the main treatment method used in China is rigid landfill, but rigid landfill is only a storage measure. In fact, it does not dispose of or comprehensively utilize the salt-containing hazardous waste. It is only an interim measure and causes certain resource waste. Content of the Utility Model

[0004] In order to solve at least one technical problem mentioned in the background technique, the purpose of the utility model is to provide a carbonization treatment device for hazardous waste salt.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] The utility model provides a carbonization treatment device for hazardous waste salt, including a heating furnace. A material bed for placing waste salt and extending along a first direction is arranged in the heating furnace. A rotating shaft extending along the first direction is rotatably arranged above the material bed in the heating furnace, and the rotation axis of the rotating shaft is parallel to the first direction; the inside of the rotating shaft is hollow to form a channel for steam to pass through; a plurality of turning members are fixedly connected to the rotating shaft and are sequentially spaced along the first direction; a cavity communicated with the channel is formed in the turning member; the turning member is driven by the rotating shaft to turn to contact and turn the waste salt on the material bed.

[0007] As an optional implementation manner of the utility model, the material bed can reciprocate in the heating furnace along the first direction.

[0008] As an optional implementation manner of the utility model, there is a gap between the two ends of the material bed and the end walls at both ends of the heating furnace; a shielding member that can expand and contract along the first direction is connected between the end of the material bed and the end wall of the heating furnace, and the shielding member is used to shield the gap between the end of the material bed and the end wall of the heating furnace.

[0009] As an optional implementation manner of the utility model, the shielding member is a flexible fabric.

[0010] As an alternative embodiment of the present utility model, it further includes a driving component for driving the material bed to reciprocate in the first direction. The driving component includes guide rods respectively fixed at both ends of the material bed and extending in the first direction; the guide rods movably pass through the end walls at both ends of the heating furnace; the driving component further includes a power member disposed outside the heating furnace, and the power member is connected to at least one guide rod to drive the guide rod to reciprocate in the first direction.

[0011] As an alternative embodiment of the present utility model, the turning member includes one or more blades disposed on the rotating shaft; a cavity is formed inside the blade.

[0012] As an alternative embodiment of the present utility model, a sandwich space is formed inside the peripheral wall of the heating furnace, and the heating furnace is heated by introducing steam into the sandwich space or an electric heating element is provided in the sandwich space.

[0013] As an alternative embodiment of the present utility model, the heating furnace includes an outer casing with an inner casing sleeved outside the outer casing, and the inner casing and the outer casing are spaced apart to form the sandwich space.

[0014] Compared with the prior art, the advantages of adopting this solution are as follows:

[0015] During operation, the waste salt to be carbonized is spread on the material bed, and steam is introduced into both the sandwich space and the channel; and the motor is started to drive the rotating shaft to rotate, so as to drive the turning member to rotate together; in this way, after the hazardous waste salt on the material bed is heat-treated, the organic matter in the hazardous waste salt will be gradually carbonized, and finally carbonized salt (i.e., a mixture of carbide and waste salt) is formed.

[0016] During the carbonization process, since the turning member is constantly rotating and is heated by the steam in the cavity, the heated turning member will continuously contact the hazardous waste salt on the material bed and disturb the hazardous waste salt during the rotation process; when the heated turning member contacts the hazardous waste salt, it can directly heat the hazardous waste salt to accelerate the carbonization of the hazardous waste salt. At the same time, the turning member disturbs and stirs the hazardous waste salt, so that the hazardous waste salt can be fully heated for carbonization, improving the thermal efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a cross-sectional view of the present utility model;

[0018] Figure 2 is a radial cross-sectional view of the present utility model;

[0019] Figure 3 is Figure 1 a partial enlarged view of the position of the blade in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The technical solutions of the embodiments of the present utility model will be explained and described below with reference to the accompanying drawings of the embodiments of the present utility model. However, the following embodiments are only the preferred embodiments of the present utility model and not all of them. Based on the embodiments in the implementation manners, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present utility model.

[0021] In the following description, terms indicating orientation or positional relationships such as "inner", "outer", "upper", "lower", "left", "right", etc. are only for convenience of describing the embodiments and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0022] Embodiment 1

[0023] Please refer to Figures 1-3 As shown, this embodiment provides a hazardous waste salt carbonization treatment device, which is mainly used for carbonizing hazardous waste salt, mainly for the carbonization treatment of salt-containing hazardous waste containing organic matter.

[0024] The hazardous waste salt carbonization treatment device provided in this embodiment includes a heating furnace 1, which is mainly used for heating and carbonizing hazardous waste salt, and it can be in the form of steam heating or heating by electric heating elements.

[0025] In some embodiments, as Figure 1 shown, the heating furnace 1 mainly includes an inner shell 12, an outer shell 11 sleeved outside the inner shell 12, and end plates 13 provided at both ends of the inner shell 12 and the outer shell 11; the overall inner shell 12 and the outer shell 11 constitute the peripheral wall of the heating furnace 1, and the end plates 13 at both ends constitute the end walls at both ends of the heating furnace 1.

[0026] A sandwich space 10 is formed by arranging the inner shell 12 and the outer shell 11 at intervals; optionally, both the inner shell 12 and the outer shell 11 are cylindrical structures and are coaxially arranged.

[0027] The heating furnace 1 is heated by introducing steam into the sandwich space 10 or by providing electric heating elements in the sandwich space 10.

[0028] Taking the steam heating method as an example, a steam inlet 131 is opened on the end plate 13 or the outer shell 11 for connecting to an external steam pipeline. The steam output from the steam pipeline enters the sandwich space 10 through the steam inlet 131 to heat the inner shell 12, and thus the heating of the furnace interior of the heating furnace 1 is realized.

[0029] In order to drain the condensate generated by the condensation of steam in the interlayer space 10 in the later stage, a condensate drain outlet 14 is provided at the bottom of the outer casing 11. In order to control the opening and closing of the condensate drain outlet 14, the condensate drain outlet 14 can be connected to a valve.

[0030] A material bed 2 for placing waste salt to be carbonized and extending along the first direction is provided in the heating furnace 1. Here, the first direction can be understood as the length direction of the heating furnace 1 or the axial direction of the heating furnace 1.

[0031] The cross-section of the material bed 2 in the radial direction of the heating furnace 1 is a concave arc.

[0032] A rotating shaft 3 that is rotatably arranged and extends along the first direction is provided above the material bed 2 in the heating furnace 1. The rotation axis of the rotating shaft 3 is parallel to the first direction; the rotating shaft 3 rotatably penetrates through the two end plates 13.

[0033] The inside of the rotating shaft 3 is hollowly arranged to form a channel 31 for steam to pass through. One end of the channel 31 is open for connection to a steam input pipeline, and steam is introduced into the channel 31 through the steam input pipeline.

[0034] One end of the rotating shaft 3 away from the steam input pipeline is connected to a motor 32 installed outside the heating furnace 1, and the rotating shaft 3 is driven to rotate by the motor 32; in order to ensure the normal rotation of the rotating shaft 3, one end of the rotating shaft 3 away from the motor 32 is rotatably connected and communicated with the steam input pipeline. For example, a rotary joint for pipeline connection can be used to achieve the rotational connection and communication between the two.

[0035] A number of turning members are fixedly connected to the rotating shaft 3 and are sequentially spaced along the first direction. The turning members can rotate together with the rotating shaft 3; as Figure 3 shown, the turning member has a cavity 331 communicated with the channel 31, so that the steam in the channel 31 enters the cavity 331, and then heats the turning member. The turning member is made of a heat-conducting material, such as a hard metal material, such as steel.

[0036] The turning member is driven by the rotating shaft 3 to flip to contact and turn the waste salt on the material bed 2.

[0037] During operation, the waste salt to be carbonized is spread on the material bed 2, and steam is introduced into both the interlayer space 10 and the channel 31; and the motor 32 is started to drive the rotating shaft 3 to rotate, so as to drive the turning members to flip together; in this way, the hazardous waste salt on the material bed 2 will be gradually carbonized after heat treatment to form carbonized salt (i.e., a mixture of carbide and waste salt).

[0038] During the carbonization process, since the turning member is constantly rotating and is heated by the steam in the cavity 331, the heated turning member will continuously contact the hazardous waste salt in the material bed 2 and disturb the hazardous waste salt during rotation; when the heated turning member contacts the hazardous waste salt, it can directly heat the hazardous waste salt to accelerate the carbonization of the hazardous waste salt. At the same time, the turning member disturbs and stirs the hazardous waste salt, enabling the hazardous waste salt to be better heated for carbonization and improving the thermal efficiency.

[0039] In order to enable the hazardous waste salt in the material bed 2 to be fully stirred by the turning member, in this embodiment, the material bed 2 can reciprocate in the heating furnace 1 along the first direction;

[0040] In this way, during the carbonization process, the turning member rotates to stir the hazardous waste salt in the material bed 2, and at the same time, the material bed 2 itself also moves reciprocally along the first direction, which is equivalent to the material bed 2 shaking left and right, so that the hazardous waste salt on the material bed 2 can be fully stirred by the turning member.

[0041] In other words, assuming that the material bed 2 remains stationary, the hazardous waste salt between two adjacent turning members on the material bed 2 at this time cannot be stirred by the turning member; when the material bed 2 can shake left and right, the hazardous waste salt on the material bed 2 is equivalent to constantly changing positions, so that the hazardous waste salt between two adjacent turning members can also be stirred by the turning member to improve the carbonization efficiency.

[0042] This hazardous waste salt carbonization treatment device further includes a driving assembly for driving the material bed 2 to reciprocate along the first direction. The driving assembly includes guide rods 22 respectively fixed at both ends of the material bed 2 and extending along the first direction. Preferably, two guide rods 22 are provided at each end of the material bed 2.

[0043] The guide rods 22 pass through the end walls at both ends of the heating furnace 1 movably, that is, through the end plates 13 at both ends; the guide rods 22 can move relative to the end plates 13 along the first direction; in this way, the material bed 2 is supported by the guide rods 22, and the material bed 2 can move reciprocally along the first direction as a whole with the guide rods 22.

[0044] In order to reduce the falling of the hazardous waste salt from both sides (mainly referring to the front and back sides) of the material bed 2; both sides of the material bed 2 are slidably attached to the peripheral wall of the inner housing 12.

[0045] The driving assembly further includes a power member provided outside the heating furnace 1. The power member is connected to at least one guide rod 22 to drive the guide rod 22 to reciprocate along the first direction. The driving member can be a cylinder, a hydraulic cylinder or a motor 32, etc. Taking the hydraulic cylinder as an example, it is fixed to the outer end of one of the guide rods 22; the telescopic movement of the hydraulic cylinder drives the guide rod 22 to reciprocate along the first direction, thereby realizing the reciprocating movement of the material bed 2 in the first direction.

[0046] Since the material bed 2 needs to rock left and right in the first direction, a space for the material bed 2 to move left and right needs to be reserved between the two end plates 13 and the two ends of the material bed 2. Therefore, in this embodiment, the two ends of the material bed 2 are spaced from the two end walls of the heating furnace 1, and this space serves as the left and right movement space for the material bed 2.

[0047] Due to the existence of the aforementioned space, the hazardous waste salt on the material bed 2 will fall into this space from the two ends of the material bed 2. Therefore, in this embodiment, a shielding member 21 that can expand and contract in the first direction is connected between the end of the material bed 2 and the end wall of the heating furnace 1. The shielding member 21 is used to shield the space between the end of the material bed 2 and the end wall of the heating furnace 1, and the shielding by the shielding member 21 can reduce the falling of the hazardous waste salt from the two ends of the material bed 2.

[0048] Among them, the shielding member 21 can be made of a high-temperature resistant flexible fabric. When connecting, the two ends of the flexible fabric are respectively fixed on the end of the rocking bed and the end plate 13.

[0049] In some embodiments, the turning member includes one or more blades 33 provided on the rotating shaft 3; for example, in this embodiment, as Figure 2 shown, one turning member includes three blades 33, and the three blades 33 are arrayed around the rotating shaft 3 with the rotating shaft 3 as the center; cavities 331 communicating with the channel 31 are formed inside the blades 33.

[0050] It should be noted that, in order to enable the hazardous waste salt to enter the material bed 2, in this embodiment, at least one end plate 13 is provided with a furnace opening 132 as the feed inlet; a furnace door 133 that can be opened and closed is provided on the furnace opening 132.

[0051] Embodiment 2

[0052] On the basis of Embodiment 1, this embodiment provides a method for treating hazardous waste salt, including the following steps:

[0053] S1. Preliminary screening; since a large part of the hazardous waste salt comes from evaporation, it is very easy to form lumps. Therefore, a vibrating screen can be used for preliminary screening, which can effectively prevent the lumped salt from entering the device, thereby making more effective use of heat energy and reducing the operating cost.

[0054] S2. Carbonization treatment to obtain carbonized salt. Specifically, the hazardous waste salt carbonization treatment device provided in Embodiment 1 can be used; specifically;

[0055] - Spread the preliminarily screened hazardous waste salt on the material bed 2.

[0056] - Steam is introduced into the interlayer space 10 and the channel 31 respectively, and the motor 32 is started; the temperature in the heating furnace 1 is set between 550 °C and 650 °C, and a gas that isolates oxygen, such as nitrogen or steam, is filled into the heating furnace 1 to isolate air and reduce the generation of dioxins.

[0057] It should be noted that in step S2, since the melting point of salt is about 801 °C, the corrosiveness of the molten salt causes too much damage to the equipment and will greatly increase the operating cost. Therefore, the carbonization temperature must be controlled below 800 °C.

[0058] When the carbonization temperature is below 800 °C, since the hazardous waste salt itself contains a large amount of halogen elements, dioxins are easily generated; therefore, in this embodiment, by setting the temperature of the heating furnace 1 between 550 °C and 650 °C, and at the same time introducing a gas that isolates oxygen into the furnace body, such as nitrogen or steam, the generation of dioxins is reduced.

[0059] - Finally, carbonized salt is obtained, that is, a mixture of carbide and waste salt.

[0060] S3. Dissolve the carbonized salt with water to obtain a waste salt solution. Specifically: According to the characteristics that carbide is insoluble in water and salt is soluble in water, the carbonized salt is put into water for dissolution to obtain a waste salt solution.

[0061] S4. Filter. Since salt is soluble in water and carbide is insoluble in water, as long as the solution is filtered, solid-liquid separation can be achieved, and the carbide insoluble in water and the brine dissolved with salt can be obtained respectively; the obtained carbide has a certain calorific value and can be used for coal powder incineration subsequently.

[0062] The specific process of filtration can be to use a centrifuge (rotating speed of 4000 r / min) and a layer of filter cloth to perform solid-liquid separation on the waste salt solution to obtain carbide and nearly saturated brine.

[0063] And the brine enters step S5 for treatment.

[0064] S5. Evaporative crystallization. Evaporative crystallization is performed on the nearly saturated brine to obtain salt that can be recycled; and the distilled water generated by evaporation can be used as irrigation water, cooling water, circulating water, production water, etc. according to actual needs.

[0065] S6. Screening and salt separation. The salt obtained in step S5 is screened to obtain coarse salt and fine salt respectively; this part of the coarse salt and fine salt can be used for the salt demand of some enterprises such as dyeing factories and chemical factories for comprehensive utilization to achieve the recycling of resources.

[0066] Among them, in step S6, specifically, a sieve with a passable pore size can be used to screen the salt obtained in step S5 to obtain coarse salt and fine salt.

[0067] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-mentioned exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model.

Claims

1. A hazardous waste salt carbonization treatment device, characterized in that: It comprises a heating furnace, wherein a material bed for placing waste salt and extending along a first direction is provided in the heating furnace, a rotating shaft which is rotatably arranged and extends along the first direction is provided in the heating furnace above the material bed, and the rotating axis of the rotating shaft is parallel to the first direction; the interior of the rotating shaft is hollow to form a channel for steam to pass through; a plurality of flipping members which are distributed in sequence along the first direction are fixedly connected to the rotating shaft; the flipping member has a cavity connected to the channel; the flipping member flips under the drive of the rotating shaft to contact and flip the waste salt on the material bed.

2. A hazardous waste salt carbonization treatment device according to claim 1, characterized in that: The material bed can reciprocate in the heating furnace along a first direction.

3. A hazardous waste salt carbonization treatment device according to claim 2, characterized in that: The two ends of the material bed are spaced apart from the end walls of the heating furnace; a shielding member extending and retracting along a first direction is connected between the ends of the material bed and the end walls of the heating furnace, and the shielding member is used to shield the space between the ends of the material bed and the end walls of the heating furnace.

4. A hazardous waste salt carbonization treatment device according to claim 3, characterized in that: The shielding member is made of flexible fabric.

5. A hazardous waste salt carbonization treatment device according to any one of claims 2 to 4, characterized in that: It also includes a driving assembly for driving the material bed to reciprocate along a first direction, the driving assembly includes guide rods respectively fixed at both ends of the material bed and extending along the first direction; the guide rods movably pass through the end walls at both ends of the heating furnace; the driving assembly also includes a power member arranged outside the heating furnace, the power member is connected to at least one guide rod to drive the guide rod to reciprocate along the first direction.

6. The hazardous waste salt carbonization treatment device according to claim 1 is characterized in that: The flapping member comprises one or more blades arranged on the rotating shaft; the cavity is formed inside the blades.

7. The hazardous waste salt carbonization treatment device according to claim 1 is characterized in that: An interlayer space is formed in the peripheral wall of the heating furnace, and the heating furnace is heated by introducing steam into the interlayer space or by arranging an electric heating element in the interlayer space.

8. The hazardous waste salt carbonization treatment device according to claim 7 is characterized in that: The heating furnace comprises an outer shell in which an inner shell is sleeved outside an outer shell, and the inner shell and the outer shell are spaced apart to form the interlayer space.

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