Double-converter incinerator for soil remediation
By designing a dual-converter incineration device and utilizing the spiral guide plates of the dispersion tower and the rotary drum, the problems of heat loss and poor desorption effect after primary incineration in soil remediation are solved, achieving a highly efficient soil remediation effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUBEI GEOLOGICAL TEAM 4 ENGINEERING SURVEY & DESIGN CO LTD
- Filing Date
- 2025-07-09
- Publication Date
- 2026-07-21
AI Technical Summary
In existing technologies, soil remediation processes involve direct feeding of the incinerated material into a secondary rotary kiln without further dispersing, resulting in poor desorption and significant heat loss, making it difficult to achieve efficient heat utilization and incineration.
The system employs a dual-rotor incineration device, consisting of a primary rotary kiln and a secondary rotary kiln. After primary incineration, the soil is lifted and dispersed by a dispersion tower before entering the secondary rotary kiln for re-incineration. The design of the rotary drum's spiral guide plates and central flue ensures the dispersion of the soil and the effective utilization of thermal energy.
It improves thermal energy utilization, ensures the effectiveness and thoroughness of secondary incineration, reduces thermal energy loss, and achieves efficient soil remediation.
Smart Images
Figure CN224534276U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of soil remediation technology and relates to a dual-converter incineration device for soil remediation. Background Technology
[0002] Thermal desorption remediation technology for contaminated soil involves heating the organic pollutants in the soil, causing heavy metals or organic pollutants to separate from the soil through decomposition and evaporation at sufficiently high temperatures. Generally, due to the presence of moisture in the soil, primary combustion is insufficient to completely decompose decomposable substances in the soil while maintaining a certain feed-out efficiency. Therefore, re-incineration is usually required. In existing technologies, the soil is typically fed into a secondary rotary kiln after primary combustion, followed by rapid cooling for dust removal and collection of desorbed soil. This approach has the following problems: the soil after primary incineration is fed directly into the secondary rotary kiln without being broken up, and even with re-incineration, it is difficult to ensure the desorption effect. Conventional breaking up after primary incineration results in a significant loss of heat energy (during the breaking up process and cooling before breaking up). Based on this, a low-energy-consumption, high-efficiency dual-rotor incineration device is proposed. Utility Model Content
[0003] The purpose of this invention is to address the aforementioned problems in existing technologies by providing a dual-converter incineration device for soil remediation. The technical problem this invention aims to solve is how to improve thermal energy utilization and incineration efficiency.
[0004] The objective of this utility model can be achieved through the following technical solution: A dual-rotor incineration device for soil remediation, characterized in that it includes a primary rotary kiln, a secondary rotary kiln, and a dispersion tower. There is a height difference between the primary and secondary rotary kilns, with the primary kiln being higher than the secondary kiln. The dispersion tower is located at the outlet of the primary rotary kiln. The dispersion tower includes an outer protective tower body, a rotating cylinder, and a central flue. The outlet of the primary rotary kiln connects to the middle of the outer protective tower body outside the rotating cylinder. The lower end of the outer protective tower body is connected to the inlet of the secondary rotary kiln via a walkway. The inclined tubes are connected, the rotating drum has a spiral guide plate on the outside, the upper end of the outer tower body has a conical contraction section, the distance between the outer wall of the rotating drum and the inner wall of the contraction section gradually decreases from bottom to top, the top of the rotating drum is connected to the inner cavity of the outer tower body, the outlet of the secondary rotary kiln has a collection hood, the lower end of the central flue is connected to the top of the collection hood, and the outlet of the central flue extends above the outer tower body; the rotating drum rotates between the central flue and the outer tower body in a direction that can drive the soil on the spiral guide plate to rise upward.
[0005] Furthermore, a dustproof cylinder is fixedly connected to the rotating drum outside the central flue. The dustproof cylinder is located inside the rotating drum, with its lower end located in the middle of the rotating drum and communicating with the inner cavity of the rotating drum. The upper end of the dustproof cylinder is rotatably connected to the central flue, and an interconnection hole is provided on the central flue to connect with the top of the dustproof cylinder.
[0006] Furthermore, the exhaust direction of the primary rotary kiln is located on one side of the rotary drum axis.
[0007] Furthermore, the bottom of the rotating drum has a return mesh.
[0008] After being incinerated in the primary rotary kiln, the soil enters the dispersion tower. The function of the dispersion tower is to lift the soil to the top of the rotary kiln, and then drop it from the top of the rotary kiln to the bottom of the outer protective tower body. It then enters the inclined pipe and enters the secondary rotary kiln through the inlet. After being incinerated again in the secondary rotary kiln, the soil is discharged. The flue gas generated by the secondary rotary kiln and the flue gas generated by the primary rotary kiln are both discharged from the central flue.
[0009] As the slowly rotating drum lifts the soil to the contraction section, the distance between the outer wall of the drum and the inner wall of the outer tower gradually decreases, causing the soil to be compressed. During this compression process, the soil clumps are dispersed, while soil powder and undispersible stones enter the inner cavity of the drum from the top and fall into the inlet of the feed pipe. Following the terrain difference, the soil enters the inlet of the secondary rotary kiln. Because the soil enters the secondary rotary kiln after being dispersed, the effectiveness and thoroughness of secondary combustion are ensured. In addition, the process of the dispersed soil being hoisted from top to bottom in the inner cylinder outside the central flue is also a process of heat volatilization of volatiles in the dispersed soil. The powdery soil exiting the primary rotary kiln is directly discharged from the return net at the bottom of the drum to the feed pipe. In this way, it is ensured that the soil in the secondary rotary kiln consists of refined soil and undispersible stones.
[0010] It is evident that the soil is in a heat preservation process between the first and second incineration, resulting in minimal heat loss. The flue gas generated after the second incineration is discharged through the same pipe as the flue gas from the first incineration. The flue gas from the second incineration circulates in the central flue inside the rotary drum, ensuring the maintenance of the temperature within the dispersion tower. The flue gas inside the rotary drum is connected to the central flue through a dustproof casing and is discharged from the central flue. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the structure of the incineration device.
[0012] Figure 2 This is a schematic diagram of the internal structure of the rotating drum.
[0013] Figure 3 This is a schematic diagram showing the connection location of the dispersion tower at the outlet of the primary rotary kiln.
[0014] In the diagram, 1. Primary rotary kiln; 2. Secondary rotary kiln; 3. Dispersion tower; 31. Outer tower body; 32. Rotary drum; 33. Central flue; 34. Spiral guide plate; 35. Dustproof cylinder; 36. Interconnection hole; 37. Return material net; 4. Collection hood; 5. Inclined feed pipe. Detailed Implementation
[0015] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.
[0016] like Figure 1 , Figure 2 and Figure 3 The dual-rotor incineration device for soil remediation shown includes a primary rotary kiln 1, a secondary rotary kiln 2, and a dispersion tower 3. There is a height difference between the primary and secondary rotary kilns 1 and 2. The dispersion tower 3 is located at the outlet of the primary rotary kiln 1 and includes an outer casing 31, a rotating drum 32, and a central flue 33. The outlet of the primary rotary kiln 1 connects to the middle of the outer casing 31 outside the rotating drum 32. The lower end of the outer casing 31 is connected to the inlet of the secondary rotary kiln 2 via a feed inclined pipe 5. The rotating drum 32 has spiral guide plates. 34. The upper end of the outer tower body 31 has a conical constriction section. The distance between the outer wall of the rotating cylinder 32 inside the constriction section and the inner wall of the constriction section gradually decreases from bottom to top. The top of the rotating cylinder 32 communicates with the inner cavity of the outer tower body 31. The outlet of the secondary rotary kiln 2 has a collection hood 4. The lower end of the central flue 33 is connected to the top of the collection hood 4. The outlet of the central flue 33 extends above the outer tower body 31. The rotating cylinder 32 rotates between the central flue 33 and the outer tower body 31 in a direction that can drive the soil on the spiral guide plate 34 to rise. The bottom of the rotating cylinder 32 has a return net 37.
[0017] A dustproof cylinder 35 is fixedly connected to the rotating cylinder 32 outside the central flue 33. The dustproof cylinder 35 is located inside the rotating cylinder 32, with its lower end located in the middle of the rotating cylinder 32. The lower end of the dustproof cylinder 35 communicates with the inner cavity of the rotating cylinder 32, and its upper end is rotatably connected to the central flue 33. An interconnection hole 36 is provided on the central flue 33 to connect with the top of the dustproof cylinder 35.
[0018] The exhaust direction of the primary rotary kiln 1 is located on one side of the axis of the rotary drum 32. The primary rotary kiln 1, positioned eccentrically in the dispersion tower 3, allows the flue gas discharged from the primary rotary kiln 1 to spiral upwards within the rotary drum 32, aligning with the spiral direction of the spiral guide plate 34. This ensures relatively smooth upward movement of the flue gas and soil. Simultaneously, in conjunction with the flow around the spiral guide plate 34, the flue gas and dispersed soil also form a spiral mixed airflow within the rotary drum 32, providing a certain degree of cyclone dust removal function. This separates the flue gas and soil within the rotary drum 32, with the flue gas rising and the soil descending.
[0019] After being incinerated in the primary rotary kiln 1, the soil enters the dispersion tower 3. The function of the dispersion tower 3 is to lift the soil to the top of the rotary drum 32, and then drop it from the top of the rotary drum 32 to the bottom of the outer protective tower body 31. Then it enters the inclined pipe 5 and enters the secondary rotary kiln 2 through the inlet. After being incinerated again in the secondary rotary kiln 2, it is discharged. The flue gas generated by the secondary rotary kiln 2 and the flue gas generated by the primary rotary kiln 1 are both discharged from the central flue 33.
[0020] As the slowly rotating drum 32 lifts the soil to the contraction section, the distance between the outer wall of the drum 32 and the inner wall of the outer protective tower 31 gradually decreases, causing the soil to be compressed. During the compression process, the soil clumps are dispersed, and soil powder and non-dispersible stones enter the inner cavity of the drum 32 from the top and fall into the inlet of the feed pipe 5. Following the terrain difference, the soil enters the inlet of the secondary rotary kiln 2. Since the soil enters the secondary rotary kiln 2 after being dispersed, the effectiveness and thoroughness of secondary combustion are ensured. In addition, the process of the dispersed soil being hoisted from top to bottom in the inner cylinder outside the central flue 33 is also a process of heating and volatilizing the volatiles in the dispersed soil. The powdery soil exiting from the primary rotary kiln 1 is directly discharged from the return net 37 at the bottom of the drum 32 to the feed pipe 5. In this way, it is ensured that the soil in the secondary rotary kiln 2 consists of refined soil and non-refined stones.
[0021] It is evident that the soil is in a heat preservation process after the first incineration and before the second incineration, resulting in minimal heat loss. The flue gas generated after the second incineration is discharged through the same pipe as the flue gas from the first incineration. The flue gas from the second incineration circulates within the central flue 33 inside the rotary drum 32, ensuring the maintenance of the temperature within the dispersion tower 3. The flue gas inside the rotary drum 32 is connected to the central flue 33 through the dustproof casing 35 and is discharged from the central flue 33.
[0022] The height difference between the primary rotary kiln 1 and the secondary rotary kiln 2 is achieved through the ground layout. The inclined feeding pipe 5 is set at an angle so that the soil can directly enter the secondary rotary kiln 2 along the height difference. The inlet of the primary rotary kiln 1 is fed with soil to be burned, natural gas, and combustion-supporting gas, while the inlet of the secondary rotary kiln 2 is fed with combustion-supporting gas and natural gas. Both the primary rotary kiln 1 and the secondary rotary kiln 2 rotate slowly. Since the soil is refined before entering the secondary rotary kiln 2, the rotation speed of the secondary rotary kiln 2 can be appropriately increased. The connection between the primary rotary kiln 1 and the outer tower body 31 is achieved through a clearance fit. The connection between the central flue 33 and the rotating cylinder 32, and between the rotating cylinder 32 and the outer tower body 31, are also clearance fits. The top of the rotating cylinder 32 extends outward from the high-temperature zone. This extension is used for the rotation positioning of the rotating cylinder 32 and its cooperation with the drive unit.
[0023] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.
Claims
1. A dual-converter incineration device for soil remediation, characterized in that, The system includes a primary rotary kiln (1), a secondary rotary kiln (2), and a dispersion tower (3). There is a height difference between the primary and secondary rotary kilns (1 and 2), with the primary kiln (1) being higher than the secondary rotary kiln (2). The dispersion tower (3) is located at the outlet of the primary rotary kiln (1). The dispersion tower (3) includes an outer protective tower body (31), a rotating drum (32), and a central flue (33). The outlet of the primary rotary kiln (1) is connected to the middle of the outer protective tower body (31) outside the rotating drum (32). The lower end of the outer protective tower body (31) is connected to the inlet of the secondary rotary kiln (2) via a feed inclined pipe (5). The rotating drum (32) has a spiral... The upper end of the outer tower body (31) has a conical constriction section. The distance between the outer wall of the rotating cylinder (32) inside the constriction section and the inner wall of the constriction section gradually decreases from bottom to top. The top of the rotating cylinder (32) is connected to the inner cavity of the outer tower body (31). The outlet of the secondary rotary kiln (2) has a collection hood (4). The lower end of the central flue (33) is connected to the top of the collection hood (4). The outlet of the central flue (33) extends above the outer tower body (31). The rotating cylinder (32) rotates between the central flue (33) and the outer tower body (31) in a direction that can drive the soil on the spiral guide plate (34) to rise.
2. The dual-converter incineration device for soil remediation according to claim 1, characterized in that, A dustproof cylinder (35) is fixedly connected to the rotating cylinder (32) outside the central flue (33). The dustproof cylinder (35) is located inside the rotating cylinder (32). The lower end of the dustproof cylinder (35) is located in the middle of the rotating cylinder (32). The lower end of the dustproof cylinder (35) communicates with the inner cavity of the rotating cylinder (32). The upper end of the dustproof cylinder (35) is rotatably connected to the central flue (33). An interconnection hole (36) is opened on the central flue (33) to connect with the top of the dustproof cylinder (35).
3. The dual-converter incineration device for soil remediation according to claim 2, characterized in that, The exhaust direction of the primary rotary kiln (1) is located on one side of the axis of the rotary drum (32).
4. The dual-converter incineration device for soil remediation according to claim 2, characterized in that, The bottom of the rotating drum (32) has a return mesh (37).