A thermal desorption rotary kiln for a waste high-temperature pretreatment system

Abstract

The present invention discloses a thermal desorption rotary kiln for a waste high-temperature pretreatment system, which includes a kiln body. At both ends of the kiln body, there are laminated kiln head sealing devices and kiln tail sealing devices. On the outside, there are several tyre structures, which are tangential suspension structures and are placed above two sets of supporting roller devices. On both sides of the tyre structures, there are retaining roller devices. The supporting roller device is a rolling bearing mechanism, and a gear transmission mechanism is also provided on the outside of the kiln body. On the inner side of the kiln body, a double-layer refractory brick with spiral protrusions is laid. The present invention uses a double-layer refractory brick to avoid the corrosion of the cylinder body, while strengthening the agitation of the materials and improving the heat-receiving reaction effect of the materials. By using a tangential suspension tyre structure, the transmission stability is improved. The kiln speed of the present invention can be increased by 100% compared with that of a conventional waste disposal rotary kiln, and the processing capacity can be increased by 200%. It has good application prospects and realizes the efficient operation of the waste high-temperature pretreatment system.

Description

Technical Field

[0001] The present invention relates to a rotary kiln, and particularly to a thermal desorption rotary kiln for a waste high-temperature pretreatment system. Background Art

[0002] Most of the existing devices for co-disposing waste with cement kilns are for disposing a single type of waste. For the few devices that can dispose of multiple types of waste, different wastes are pre-treated and then directly added to different parts of the cement kiln system separately. These methods are greatly restricted by the material composition, with low disposal capacity, and will affect the stability of the cement burning system and reduce the quality of cement clinker. In order to effectively and stably treat various types of waste with large compositional variations, a high-temperature pretreatment system has been developed. However, this system lacks a supporting thermal desorption rotary kiln. The existing rotary kiln has unstable wheel band support and limit, making it difficult to operate normally at a high rotational speed. Moreover, the materials in the kiln are prone to accumulation, affecting the heating of the materials, resulting in low processing efficiency and being unable to be applied to the high-temperature pretreatment system. Summary of the Invention

[0003] Object of the Invention: The object of the present invention is to provide an efficient and stable thermal desorption rotary kiln for a waste high-temperature pretreatment system.

[0004] Technical Solution: The present invention provides a thermal desorption rotary kiln for a waste high-temperature pretreatment system, including a kiln barrel. The two ends of the kiln barrel are provided with a kiln head sealing device and a kiln tail sealing device. Several wheel band structures are arranged on the outer side. The wheel band structures are placed above two sets of supporting roller devices, and retaining roller devices are arranged on both sides. A gear transmission mechanism is also arranged on the outer side of the kiln barrel. It is characterized in that a double-layer refractory brick with spiral protrusions is laid on the inner side of the kiln barrel. The supporting roller device is a rolling bearing mechanism, and the wheel band structure is a tangential suspension structure.

[0005] Preferably, the kiln head sealing device and the kiln tail sealing device adopt a laminated sealing structure.

[0006] Preferably, the wheel band structure includes a wheel band installed on the outer surface of the kiln barrel. Several fixed teeth and suspensions are arranged on both sides of the wheel band. The fixed teeth are welded on the outer surface of the kiln barrel. The suspensions are fixedly installed on the wheel band through a stud-nut combination. The suspensions are arranged between adjacent fixed teeth and are connected to the fixed teeth on both sides. The retaining roller device abuts against the side surface of the wheel band.

[0007] Preferably, the fixed teeth are "T"-shaped, and the suspensions are circumferentially fixed to the side surface of the fixed teeth through wedge blocks. The wedge blocks wedge tightly between the suspensions and the fixed teeth and play a role in transmitting loads.

[0008] Preferably, a limiting block for preventing the wedge blocks from slipping is also arranged on the outer side of the kiln barrel.

[0009] Preferably, the inner refractory bricks of the refractory bricks are of the same size and arranged staggeredly, and the outer refractory bricks are arranged staggeredly, including a number of thick bricks and a number of thin bricks. The thick bricks are arranged in a spiral pattern on the inner wall of the kiln to form a spiral protrusion; the brick joints between the inner refractory bricks and the outer refractory bricks are arranged staggeredly. The spiral protrusion, as a material lifting structure, can strengthen the material turnover, prevent material accumulation and penetration, and enhance the heat-reaction effect of the material.

[0010] Preferably, the gear transmission mechanism includes a large gear ring fixed on the outer side of the kiln shell, and a motor and a gear structure for driving the large gear ring.

[0011] Preferably, the diameter of the kiln shell is 3.8 - 4.6 m, and the length is 15 - 20 m.

[0012] Preferably, the rolling bearings of the supporting roller device are fixed through bearing seats, and the outer peripheral sides thereof are in contact with the tyre.

[0013] Preferably, the working speed of the rotary kiln is 2 r / min - 3 r / min.

[0014] Advantages: Compared with the prior art, the present invention has the following advantages: 1. The kiln speed is 100% faster than that of the conventional waste disposal rotary kiln, and the processing capacity is increased by 200%; 2. The refractory bricks are divided into inner and outer layers, and the brick joints between the inner and outer layers and adjacent bricks in the same layer are arranged staggeredly, which can effectively prevent the molten corrosive material from penetrating and eroding the shell from the inside to the outside; the spiral protrusion, as a material lifting structure, strengthens the material turnover, prevents material accumulation and penetration, and at the same time enhances the heat-reaction effect of the material; 3. The tyre adopts a tangential suspension structure. Compared with the traditional tyre structure, it can greatly improve the roundness of the shell, ensure that the double-layer refractory bricks have a long service life at a higher kiln speed; at the same time, this tyre can also improve the transmission stability; 4. The laminated structure is adopted to strengthen the sealing effect of the kiln head seal and the kiln tail seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the present invention;

[0016] Figure 2 is a schematic structural diagram of the refractory bricks of the present invention;

[0017] Figure 3 is a schematic structural diagram of the tyre of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] The technical solution of the present invention will be further described below with reference to the drawings.

[0019] As Figures 1-3As shown in the figure, a thermal desorption rotary kiln for a waste high-temperature pretreatment system includes a kiln shell 1 with a diameter of 4 m and a length of 20 m. A double-layer refractory brick 2 is laid inside the kiln shell 1. The kiln shell 1 is sleeved inside two tyre structures 3. Each tyre structure 3 is supported on two sets of supporting roller devices 4, and the supporting roller devices 4 adopt a rolling bearing structure, and the outer peripheral surface of the rolling bearing is in contact with the tyre structure 3. Mechanical stop wheel devices 5 are arranged on both sides of one of the tyre structures 3, and the stop wheel devices 5 abut against the side surface of the tyre structure to prevent the kiln shell from shifting. A large gear ring 6 is arranged on the outer surface of the kiln shell 1, and the large gear ring 6 is driven by a gear transmission device and a motor 7 arranged parallel to the center line of the rotary kiln, and drives the kiln shell 1 to rotate. Laminated kiln head sealing devices 8 and laminated kiln tail sealing devices 9 are arranged at both ends of the rotary kiln to prevent external cold air from invading and affecting the temperature inside the kiln.

[0020] The refractory brick 2 has a double-layer structure. The inner refractory bricks of the refractory brick 2 are of the same size and are arranged staggeredly. The outer refractory bricks are arranged staggeredly, including a number of thick bricks and a number of thin bricks. The thick bricks are arranged in a spiral shape on the inner wall of the kiln to form a spiral protrusion 21. The brick joints between the inner refractory bricks and the outer refractory bricks are arranged staggeredly.

[0021] The tyre structure 3 is a tangential suspension structure. The tyre structure 3 includes a tyre 32 installed on the outer surface of the kiln shell 1. A number of fixed teeth 31 and suspensions 33 are arranged on both sides of the tyre 32. The fixed teeth 31 are evenly arranged and fixedly welded on the outer surface of the kiln shell 1. The suspensions 33 are fixed on the tyre 32 through a stud-nut combination. The suspensions 33 are arranged between adjacent fixed teeth 31 and are connected to the fixed teeth 31 on both sides. The fixed teeth 31 are in a "T" shape. The suspensions 33 and the side surfaces of the fixed teeth 31 are circumferentially fixed through two wedge blocks 34. The fixed teeth 31 and the suspensions 33 are wedged tightly by the wedge blocks 34 to transmit the load. A limit block 35 for preventing the wedge blocks 34 from slipping is arranged outside the kiln shell 1.

[0022] This device is applied to a waste high-temperature pretreatment system. When working, the working speed of the rotary kiln is 2 r / min to 3 r / min.

Claims

1. A thermal desorption rotary kiln for a waste high-temperature pretreatment system, comprising a kiln shell (1), with a kiln head sealing device (8) and a kiln tail sealing device (9) provided at both ends of the kiln shell (1), several tyre structures (3) provided on the outside, each tyre structure (3) placed above two sets of supporting roller devices (4), with a retaining roller device (5) provided on both sides thereof, and a gear transmission mechanism is also provided on the outside of the kiln shell (1); characterized in that, A double-layer refractory brick (2) with spiral protrusions is laid on the inner side of the kiln shell (1). The supporting roller device (4) is a rolling bearing mechanism, and the tyre structure (3) is a tangential suspension structure. The tyre structure (3) includes a tyre (32) installed on the outer surface of the kiln shell (1). A number of fixed teeth (31) and suspensions (33) are arranged at intervals on both sides of the tyre (32). The fixed teeth (31) are welded and fixed on the outer surface of the kiln shell (1). The suspensions (33) are fixedly installed on the tyre (32) by a stud-nut combination. The suspensions (33) are arranged between adjacent fixed teeth (31) and are connected to the fixed teeth (31) on both sides. The retaining ring device (5) abuts against the side of the tyre (32).

2. The thermal desorption rotary kiln for a waste high-temperature pretreatment system according to claim 1, characterized in that, The kiln head seal device (8) and the kiln tail seal device (9) adopt a laminated seal structure.

3. The thermal desorption rotary kiln for a waste high-temperature pretreatment system according to claim 1, characterized in that, The fixed teeth (31) are in a "T" shape, and the circumferential fixation between the suspension (33) and the side surface of the fixed teeth (31) is realized through a wedge block (34).

4. The thermal desorption rotary kiln for a waste high-temperature pretreatment system according to claim 3, characterized in that, A limiting block (35) for preventing the wedge block (34) from slipping is further arranged on the outer side of the kiln shell (1).

5. The thermal desorption rotary kiln for a waste high-temperature pretreatment system according to claim 1, characterized in that, The inner layer refractory bricks of the refractory brick (2) are of the same size and are staggered. The outer layer refractory bricks are staggered, including a number of thick bricks and a number of thin bricks. The thick bricks are spirally arranged on the inner wall of the kiln to form a spiral protrusion (21). The brick joints of the inner layer refractory brick and the outer layer refractory brick are arranged staggeredly.

6. The thermal desorption rotary kiln for a waste high-temperature pretreatment system according to claim 1, characterized in that, The gear transmission mechanism includes a large gear ring (6) fixed on the outer side of the kiln shell, a motor (7) for driving the large gear ring (6), and a gear coaxial with the motor (7).

7. The thermal desorption rotary kiln for a waste high-temperature pretreatment system according to claim 1, characterized in that, The diameter of the kiln shell (1) is 3.8 - 4.6 m, and the length is 15 - 20 m.

8. The thermal desorption rotary kiln for a waste high-temperature pretreatment system according to claim 1, characterized in that, The rolling bearing of the supporting roller device (4) is fixed through a bearing seat, and its outer peripheral side is in contact with the tyre (32).

Images