Chimney for fly ash melting furnace and method for disposing fly ash
By designing a chimney for fly ash melting furnace, the up and down movement of the jointed steel ring scrapes off the chloride crystals on the inner wall of the flue, the problems of flue blockage and secondary pollution are solved, and efficient flue cleaning and fly ash disposal are achieved.
Patent Information
- Application Number
- CN202510092781.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2025-04-25
AI Technical Summary
There is a dilemma of clogging chloride crystals in the flue of the plasma melting furnace. The prior art requires water washing to remove chloride ions, resulting in secondary pollution problems during the fly ash water washing process.
A chimney for fly ash melting furnace is designed, mainly composed of a steel cylinder, with an external spiral steel column and a jointed steel ring. The upper and lower sides of the jointed steel ring have oblique cutouts. The rotation of the steel column drives the jointed steel ring to move up and down, scraping off the chloride crystals on the inner wall of the steel cylinder.
It effectively avoids blockage of the fly ash melting furnace flue, eliminates the need to remove chloride ions during the fly ash water washing process, avoids secondary pollution, and achieves efficient recovery of chloride crystals on the inner wall of the flue.
Smart Images
Figure CN119879582A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a chimney for a fly ash melting furnace and also to a method for disposing of fly ash. Background Art
[0002] Domestic waste is reduced and rendered harmless through incineration, and exhaust gas is discharged in compliance with emission standards. The remaining "last mile" problem is the disposal of fly ash. These fly ashes are enriched with heavy metals and dioxins produced during the incineration process, which pose a threat to human health. They are included in the "National List of Hazardous Wastes" and need to be properly disposed of.
[0003] The melting method is an effective means to properly dispose of fly ash from the incineration of domestic waste. It uses a plasma melting furnace to heat and melt the fly ash formed after the incineration of waste under the high temperature generated by electric heating to form harmless glassy slag. This process can reduce the volume and amount of fly ash and fix heavy metals and dioxins in stable glassy slag.
[0004] However, the flue of the plasma melting furnace is blocked by chloride crystals produced when the flue gas is discharged. The existing melting method for treating fly ash requires washing the fly ash with water to remove chloride ions before it can enter the melting state, which leads to the problem of secondary pollution during the fly ash washing process.
[0005] These are the shortcomings of the existing technology. Summary of the invention
[0006] The technical problem to be solved by the present invention is to provide a chimney for a fly ash melting furnace, which can remove crystals in the flue and avoid clogging the flue.
[0007] The technical solution corresponding to the above technical problem is: a chimney for a fly ash melting furnace, mainly composed of a steel cylinder, a steel frame is provided on the outside of the steel cylinder, and the steel frame is composed of vertical channel steels and horizontal channel steels that cross in a cross shape and connect the vertical channel steels. A steel column with an external spiral and a connected steel ring are provided in the steel cylinder, the steel column is pivotally connected to the cross center of the steel frame, an internal gear that cooperates with the external thread is provided in the connected steel ring, and the upper and lower sides of the steel ring have oblique cuts.
[0008] The inner wall of the steel cylinder is covered with a stainless steel plate material that is resistant to chlorine corrosion.
[0009] The vertical error between the center of the upper circle and the center of the lower circle of the steel cylinder does not exceed 3 mm.
[0010] The connected steel ring is formed into a whole by connecting four steel rings arranged horizontally up and down and six stainless steel pipes arranged vertically between adjacent steel rings.
[0011] The spacing distance between the connected steel ring and the inner wall of the steel tube is controlled to be 0.9-1.1 cm.
[0012] The adjacent steel rings of the connected steel ring are spaced 2±0.1 meters apart.
[0013] Each of the connected steel rings has a diameter of 0.9±0.1 meters, a steel ring wall thickness of 4±0.1 centimeters, and a steel ring wall width of 25±0.1 centimeters.
[0014] The channel steel is I-shaped carbon steel.
[0015] Another technical problem to be solved by the present invention is to provide a melting method for fly ash disposal using the above chimney, which avoids the secondary pollution problem in the fly ash washing process.
[0016] The technical solution corresponding to the above technical problem is: a method for disposing of fly ash, comprising the step of heating and melting the fly ash using a plasma melting furnace; this method eliminates the step of removing chloride ions by water washing before heating and melting the fly ash; but includes the following steps: the connected steel ring moves up and down in the steel cylinder to scrape off the chloride crystals on the inner wall of the steel cylinder.
[0017] The one-piece steel ring moves up and down once per minute, and the up and down moving distance is controlled within 2±0.1 meters.
[0018] The technical effect of the present invention is that: by using the chimney of the present invention, the conjoined steel ring can be moved up and down in the steel cylinder, and the oblique cuts on the upper and lower sides of the steel ring continuously scrape off the chloride crystals on the inner wall of the steel cylinder, thereby avoiding the blockage of the flue of the fly ash melting furnace. The method for disposing fly ash of the present invention, by virtue of the conjoined steel ring moving up and down in the steel cylinder, the oblique cuts on the upper and lower sides of the steel ring continuously scrape off the chloride crystals on the inner wall of the steel cylinder, thereby eliminating the necessity of the step of washing with water to remove chloride ions, thereby perfectly avoiding the secondary pollution problem in the process of washing the fly ash. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 is a schematic diagram of a chimney for a fly ash melting furnace according to the present invention.
[0020] Figure 2 yes Figure 1 A three-dimensional schematic diagram of .
[0021] In the figure: 1-steel column, 2-steel frame, 3-steel cylinder, 4-jointed steel ring, 5-connecting pipe, 6-smoke pipe, 7-collection box DETAILED DESCRIPTION
[0022] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
[0023] See also Figure 1~Figure 2The chimney for the fly ash melting furnace of the present invention comprises a steel frame 2 mainly composed of four upright channel steels. The upright channel steels are cross-connected at the top by horizontal channel steels to form a cross shape. A steel cylinder 3 is arranged in the steel frame 2. The steel cylinder 3 has a diameter of 1 meter and a height of 15 meters. The inner wall surface of the steel cylinder 3 is completely covered with a 3 mm thick chlorine corrosion-resistant stainless steel plate material. The error between the upper center and the lower center of the steel cylinder 3 cannot exceed 3 mm.
[0024] A sleeve similar to an engine cylinder is installed on the inner wall of the steel cylinder 3. The sleeve is composed of four conjoined steel rings 4, which are connected to form a whole by six stainless steel connecting pipes 5. Each steel ring is 2 meters apart and connected by stainless steel pipes. Each steel ring has a diameter of 0.9 meters, a wall thickness of 4 cm, and a width of 25 cm. The upper and lower sides of the steel ring are cut with an oblique knife to facilitate scraping. The distance between the four conjoined steel rings and the inner wall of the steel cylinder is controlled at about 1 cm to ensure that they can move up and down on the inner wall of the steel cylinder, and the chloride crystals on the inner wall of the steel cylinder can be scraped off when moving up and down.
[0025] A spiral gear steel column 1 is set in the steel cylinder 3, which is connected to the cross steel frame 2. The four installed connected steel rings are connected to the spiral gear steel column 1. The steel column 1 is rotated by the motor to drive the connected steel ring up and down. In this way, a steel ring similar to an engine cylinder that can move up and down on the inner wall of the steel cylinder is formed. It moves up and down once per minute, and the up and down movement distance is controlled at 2 meters. The flue gas from the flue pipe 6 of the plasma treatment fly ash melting furnace sublimates to the inner wall of the steel cylinder 3. As the flue temperature of the steel cylinder 3 drops, condensation is easily formed, causing chloride crystals to hang on the flue wall. At this time, the four connected inner steel rings move up and down on the inner wall of the steel cylinder chimney, and the chloride crystals hanging on the wall are easily scraped off and enter the collection box 7. Basically, more than 95% of the chloride crystals on the inner wall of the flue can be recovered, which completely solves the problem of chloride crystals generated in the plasma treatment fly ash melting furnace.
[0026] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.
Claims
1. A chimney for a fly ash melting furnace, mainly composed of a steel cylinder, characterized in that: A steel frame is provided on the outside of the steel cylinder, and the steel frame is composed of vertical channel steels and horizontal channel steels that cross in a cross shape and connect the vertical channel steels. A steel column with an external spiral and a connected steel ring are provided in the steel cylinder. The steel column is pivotally connected to the cross center of the steel frame. An internal gear that cooperates with the external thread is provided in the connected steel ring. The upper and lower sides of the steel ring have oblique cuts.
2. The chimney for a fly ash melting furnace according to claim 1, characterized in that: The inner wall of the steel cylinder is covered with a stainless steel plate material that is resistant to chlorine corrosion.
3. The chimney for a fly ash melting furnace according to claim 2, characterized in that: The vertical error between the center of the upper circle and the center of the lower circle of the steel cylinder does not exceed 3 mm.
4. The chimney for a fly ash melting furnace according to any one of claims 1 to 3, characterized in that: The connected steel ring is formed into a whole by connecting four steel rings arranged horizontally up and down and six stainless steel pipes arranged vertically between adjacent steel rings.
5. The chimney for a fly ash melting furnace according to claim 4, characterized in that: The spacing distance between the connected steel ring and the inner wall of the steel tube is controlled to be 0.9-1.1 cm.
6. The chimney for a fly ash melting furnace according to claim 4, characterized in that: The adjacent steel rings of the connected steel ring are spaced 2±0.1 meters apart.
7. The chimney for a fly ash melting furnace according to claim 4, characterized in that: Each of the connected steel rings has a diameter of 0.9±0.1 meters, a steel ring wall thickness of 4±0.1 centimeters, and a steel ring wall width of 25±0.1 centimeters.
8. The chimney for a fly ash melting furnace according to claim 1, characterized in that: The channel steel is I-shaped carbon steel.
9. A method for disposing fly ash, comprising the step of heating and melting the fly ash using a plasma melting furnace; wherein: The method eliminates the step of washing the fly ash with water to remove chloride ions before heating and melting the fly ash; however, the method includes the following steps: The one-piece steel ring moves up and down in the steel cylinder to scrape off the chloride crystals on the inner wall of the steel cylinder.
10. The method for disposing fly ash according to claim 9, characterized in that: The one-piece steel ring moves up and down once per minute, and the up and down moving distance is controlled within 2±0.1 meters.