Steam piping system for a dry kiln
By installing a steam pipeline unit and a condensate collection system inside the rotary kiln, the problems of uneven steam heating and condensate leakage in the steam drying kiln were solved, achieving efficient drying of copper concentrate and environmental improvement.
Patent Information
- Application Number
- CN202310479697.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-04-28
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2043-04-28
AI Technical Summary
How to improve the use of steam produced by waste heat boilers as a heat source to dry mixed copper concentrate with a water content of about 10%, thereby reducing the water content of the dried copper concentrate and avoiding the problems of unsaturated steam spreading everywhere and condensate dripping arbitrarily.
A steam pipeline unit is installed inside the rotary kiln body, including a steam inlet pipe, a steam return pipe, and an arc-shaped pipe. Steam is supplied through a rotating sealed connection between a static steam chamber and a dynamic steam chamber. A condensate storage chamber and a condensate drain pipe are also provided to ensure uniform heating of steam and collection of condensate, and to prevent leakage of unsaturated steam and condensate.
It achieves uniform heating of copper concentrate, reduces the moisture content after drying to ≤0.3%, improves the environmental hygiene of the production site, and enhances heat exchange efficiency and equipment maintenance convenience.
Smart Images
Figure CN116793038B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to a powder drying equipment, in particular to a steam pipeline system of a mineral powder drying kiln. BACKGROUND
[0002] The steam drying kiln or steam drying kiln machine is simply called a dryer. The copper ore powder is dried in the drying process, which is a preparatory process for flash smelting. The mixed copper concentrate with about 10% water content is discharged from the concentrate batching bin. The iron impurities in the concentrate are removed by electromagnetic iron removal, and the blocky materials are removed by a vibrating screen. Then the mixed copper concentrate is sent to the steam dryer through a batching and conveying belt. The mixed copper concentrate is dried by using the heat source provided by the steam. Through heat conduction, the concentrate is heated and dried. After drying, the mixed copper concentrate with water content ≤0.3% is discharged from the discharge hopper of the dryer, and the dust gas concentrate is recovered and enters the corresponding 120T intermediate dry ore bin.
[0003] How to improve the steam produced by the waste heat boiler as a heat source to dry the mixed copper concentrate with about 10% water content is a problem to be solved. SUMMARY
[0004] The purpose of the present application is to provide a steam pipeline system of a drying kiln for drying mixed copper concentrate to reduce the water content of copper concentrate.
[0005] A steam pipeline system of a drying kiln, characterized in that: a steam pipeline unit is arranged in the cylinder cavity of the rotary kiln body, the steam pipeline unit comprises a steam inlet pipe and a steam return pipe, the steam inlet pipe and the steam return pipe are parallel and consistent with the length direction of the rotary kiln body, there is an arc-shaped pipe connecting between the steam inlet pipe and the steam return pipe, the arc-shaped pipe is arranged in parallel and spaced apart in the length direction of the steam inlet pipe and the steam return pipe, the steam inlet end of the steam inlet pipe and the steam outlet end of the steam return pipe are located at the discharge end of the rotary kiln body, the steam outlet end of the steam return pipe is communicated with a condensate water storage chamber.
[0006] The steam distribution chamber comprises a steam static chamber and a steam dynamic chamber communicated with a steam heat source, the steam static chamber and the steam dynamic chamber are rotationally sealed, the steam static chamber in the steam static chamber and the steam dynamic chamber is fixedly connected with the base frame and remains stationary, and the steam dynamic chamber is fixed at the tail end of the rotary kiln body and rotates synchronously with the rotary kiln body.
[0007] The steam inlet end of the steam inlet pipe is communicated with the steam dynamic chamber, and the condensate water storage chamber is communicated with the steam dynamic chamber through a condensate water connection pipe.
[0008] The condensate water drainage pipe extending to the bottom of the cavity of the steam dynamic chamber passes through the communication cavity of the steam static chamber and the steam dynamic chamber, the pipe wall of the condensate water drainage pipe is arranged in spaced apart manner with the steam dynamic chamber, and the outer end of the condensate water drainage pipe extends to the outside of the steam static chamber.
[0009] The above scheme is to set the steam pipeline unit in the rotary kiln body, the steam will heat the pipe wall when passing through the steam pipeline unit, each steam pipeline unit, especially each arc-shaped pipe, is uniformly heated, and the contact probability of the pipe wall and the mixed ore is increased due to the arrangement of the arc-shaped pipe, and through heat conduction, the concentrate is heated and dried, and the mixed copper concentrate with water content ≤0.3% after drying is discharged from the discharge hopper of the dryer and the dust gas concentrate is recovered and enters the corresponding 120T intermediate dry ore bin of the dryer;
[0010] The steam static chamber in the steam static chamber and the steam dynamic chamber connected by the rotary seal is fixedly connected with the base frame and keeps a static state, the steam dynamic chamber is fixed at the tail end of the rotary kiln body and rotates synchronously with the rotary kiln body to supply steam to the steam pipeline unit; the steam outlet end of the steam return pipe is in communication with the condensate water storage chamber, and the condensate water storage chamber contains condensate water, the condensate water in the condensate water storage chamber is guided by the condensate water drainage pipe, sequentially passes through the communication section of the steam static chamber and the steam dynamic chamber, and is then discharged from the steam static chamber, so that the condensate water is not arbitrarily scattered at the discharge end of the rotary kiln body, and the phenomenon that unsaturated steam is diffused everywhere is avoided. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 is a structural schematic view of the drying kiln involved in the present application;
[0012] Figure 2 is a three-dimensional structural schematic view of the steam pipeline unit in the present application;
[0013] Figure 3 is Figure 2 an end view of the steam pipeline unit shown in
[0014] Figure 4 is Figure 2 a top view of
[0015] Figure 5 is a sectional view of the drying kiln;
[0016] Figure 6 is a steam supply schematic view of the present application;
[0017] Figure 7 is a three-dimensional structural schematic view of the steam static chamber of the present application;
[0018] Figure 8 is a structural schematic view of the steam dynamic chamber of the present application. DETAILED DESCRIPTION
[0019] As Figures 1-6As shown, the present application relates to the steam pipeline system of the mineral powder drying kiln, the supporting ring 11 arranged on the outer peripheral wall of the cylindrical horizontal rotary kiln body 10 is in rolling cooperation with the roller 20 at the lower side of the rotary kiln body 10 to implement rotation around the cylinder core of the rotary kiln body 10, the steam pipeline unit 30 is arranged in the cylinder cavity of the rotary kiln body 10, the steam pipeline unit 30 includes the steam inlet pipe 31 and the steam return pipe 32, the steam inlet pipe 31 and the steam return pipe 32 are parallel and consistent with the length direction of the rotary kiln body 10, there is an arc-shaped pipe 33 between the steam inlet pipe 31 and the steam return pipe 32, the arc-shaped pipe 33 is arranged in parallel and at intervals in the length direction of the steam inlet pipe 31 and the steam return pipe 32, the steam inlet end of the steam inlet pipe 31 and the steam outlet end of the steam return pipe 32 are located at the discharge end of the rotary kiln body 10, the steam outlet end 321 of the steam return pipe 32 is communicated with the condensed water storage chamber 50;
[0020] The steam distribution chamber 40 includes the steam static chamber 41 and the steam dynamic chamber 42 communicated with the steam heat source, the steam static chamber 41 and the steam dynamic chamber 42 are rotationally sealed, the steam static chamber 41 in the steam static chamber 41 and the steam dynamic chamber 42 is fixedly connected with the base frame and keeps static state, the steam dynamic chamber 42 is fixed at the tail end of the rotary kiln body 10 and rotates synchronously with the rotary kiln body 10;
[0021] The steam inlet end 311 of the steam inlet pipe 31 is communicated with the steam dynamic chamber 42, and the condensed water storage chamber 50 is communicated to the steam dynamic chamber 42 by the condensed water connecting pipe 422;
[0022] The condensed water drainage pipe 70 extending to the bottom of the cavity of the steam dynamic chamber 42 passes through the communication cavity of the steam static chamber 41 and the steam dynamic chamber 42, the pipe wall of the condensed water drainage pipe 70 is arranged at a distance from the steam dynamic chamber 42, and the outer end of the condensed water drainage pipe 70 extends to the outside of the steam static chamber 41.
[0023] The steam pipeline unit 30 is installed in the rotary kiln body 10 and has a whole disc pipe shape, so the steam pipeline unit 30 is also called a disc pipe unit. The arrangement is beneficial to uniform stirring of the concentrate and increases the heat exchange area, and the concentrate is heated and dried in time. In addition, the heat exchange pipeline is formed by unit elements, which is extremely beneficial to assembly of the steam pipeline unit 30. When serious wear or steam leakage fault occurs, the steam pipeline unit 30 with problems is extremely convenient to maintain and replace, and the processing difficulty of the heat exchange pipeline and the disassembly and assembly workload are significantly reduced. The steam static chamber 41 and the steam dynamic chamber 42 are connected in a rotary sealing mode, which is convenient for the steam static chamber 41 to communicate with the steam heat source and is convenient for the steam dynamic chamber 42 to distribute steam to the steam pipeline unit 30, so that stable steam supply to the steam pipeline unit 30 rotating synchronously with the rotary kiln body 10 is realized. The condensed water storage chamber 50 collects condensed water formed by further cooling of the unsaturated steam after heat exchange, and the condensed water is drained and discharged through the condensed water drain pipe 70. The unsaturated steam is prevented from diffusing in the production site, and the arbitrary dripping of the condensed water is avoided, so that the water content of the dried ore powder is ensured, and the environmental hygiene of the production site is improved.
[0024] Preferably, the pipe end of the condensed water connecting pipe 422 in the steam dynamic chamber 42 is higher than the height of the inner end of the condensed water drain pipe 70. As shown in Figure 7 、 8 , the collected condensed water is always at the low position of the cavity of the steam dynamic chamber 42, the pipe end of the condensed water drain pipe 70 is immersed below the condensed water liquid level, and the pipe end of the condensed water connecting pipe 422 is ensured to be higher than the height of the condensed water liquid level when it is at the lowest position, so that the phenomenon of backflow of the condensed water in the steam dynamic chamber 42 to the condensed water connecting pipe 422 is avoided.
[0025] More preferably, when the steam dynamic chamber 42 is designed in a cylindrical or prismatic cylindrical shape, the pipe end of the condensed water connecting pipe 422 protrudes from the cavity wall of the steam dynamic chamber 42, as shown in Figure 7 、 8 . At this time, when the pipe end of the condensed water drain pipe 70 is arranged close to the cavity wall of the steam dynamic chamber 42, it is extremely easy to realize the height difference between the pipe end of the condensed water connecting pipe 422 in the steam dynamic chamber 42 and the inner end of the condensed water drain pipe 70. In specific implementation, the condensed water connecting pipe 422 can be appropriately extended to the core position of the steam dynamic chamber 42 without interference with the condensed water drain pipe 70.
[0026] The steam static chamber 41 and the steam dynamic chamber 42 are both cylindrical and the cylinder cores of the two are coincident, and the cylinder diameter of the steam dynamic chamber 42 is greater than the pipe diameter of the connection between the steam static chamber 41 and the steam dynamic chamber 42. In combination with Figure 8The pipe diameter of the steam static chamber 41 and the steam dynamic chamber 42 at the pipe section L is smaller than the cavity diameter of the steam dynamic chamber 42, so that the condensed water can be accumulated in the steam dynamic chamber 42 and drained by the condensed water drain pipe 70, and the steam dynamic chamber 42 has a large part of the volume above the condensed water liquid level for accommodating saturated steam, and the steam distribution pipe 421 connected with the steam inlet end 311 of the steam inlet pipe 31 is also above the condensed water liquid level, so that the saturated steam is stably delivered to the steam distribution pipe 421.
[0027] It should be noted that, due to the flowability of water, the condensed water liquid level is horizontal, the steam distribution pipe 421 and the condensed water connecting pipe 422 rotate synchronously with the steam dynamic chamber 42 and the rotary kiln body 10, and the height of the pipe end of the steam distribution pipe 421 and the condensed water connecting pipe 422 when reaching the lowest position is higher than the condensed water liquid level, so that the condensed water can be prevented from entering the steam distribution pipe 421 and then flowing into the steam pipeline unit 30, and the saturated steam can be ensured to flow in the steam pipeline unit 30 to realize stable and efficient heat exchange.
[0028] In combination with Figure 5 The rotary kiln body 10 is provided with the web 60 arranged in the cylindrical cavity of the rotary kiln body 10 from the upstream end to the downstream end, the web 60 comprises the radial web 61 connected with the cylindrical wall of the rotary kiln body 10 at the outer end, and the circular ring plate 62 is fixedly connected with the inner end of the radial web 61, and 3-6 radial webs 61 are arranged in the circumferential range, the two adjacent radial webs 61 and the circular ring plate 62 on the same web 60 and the inner wall of the rotary kiln body 10 form a sector area, the profiles of the sector areas at the corresponding positions of the adjacent upstream and downstream in the projection plane perpendicular to the cylinder core of the rotary kiln body 10 coincide with each other, the steam inlet pipe 31 and the steam outlet pipe 32 on the same steam pipeline unit 30 are connected with the two adjacent radial webs 61 forming the same sector area, and the steam pipeline units 30 are arranged in the radial range from inside to outside in the same sector area to form a steam pipeline unit group 30A.
[0029] The web 60 is arranged to fix the steam inlet pipe 31 and the steam outlet pipe 32, and in turn, the steam inlet pipe 31 and the steam outlet pipe 32 enhance the bending strength and rigidity of the rotary kiln body 10. As shown in the example of Figure 5 5 radial webs 61 are arranged to form 5 sector areas A, B, C, D and E, the steam pipeline units 30 arranged in each sector area form a steam pipeline unit group 30A, and 9 layers of steam pipeline units 30 are arranged in the radial range from inside to outside in each sector area, and the rotary kiln body 10 has a total of 45 steam pipeline units 30, so that it can be seen that the present application has high heat exchange efficiency and remarkable contribution to the rigidity and strength of the rotary kiln body 10.
[0030] In combination with Figure 6The steam dynamic chamber 42 rotates synchronously with the rotary kiln body 10, so that the steam can be conveniently and reliably distributed to the steam pipe unit 30, and the rotary sealing connection between the steam static chamber 41 and the steam dynamic chamber 42 can ensure that the steam is reliably transmitted into the steam dynamic chamber 42 for distribution.
[0031] The steam dynamic chamber 42 is connected with a radially arranged steam distribution pipe 421, which is in communication with the steam inlet end 311 of each steam inlet pipe 31 in the same steam pipe unit group 30A. Figure 6 In the shown example, five steam distribution pipes 421 are provided, each of which is in communication with the steam inlet end 311 of nine steam inlet pipes 31 in the same steam pipe unit group 30A.
[0032] The steam outlet end 321 of the steam outlet pipe 32 in the same steam pipe unit group 30A is connected in reflux to a condensate connecting pipe 422, one end of which is connected to the condensate storage chamber 50 and the other end of which is connected to the steam dynamic chamber 42, and the condensate connecting pipe 422 is provided with a valve in the communication pipe with the steam dynamic chamber 42.
[0033] Figure 6 The condensate in the condensate connecting pipe 422 above the cylinder core of the steam dynamic chamber 42 in the shown state will flow directly into the steam dynamic chamber 42 under the open state of the valve, and when the condensate connecting pipe 422 is rotated from the high position to the position where the pipe body is lower than the cylinder core of the steam dynamic chamber 42, the condensate in it will flow to the condensate storage chamber 50, and when it continues to rotate from the low position to the high position, the condensate in the condensate storage chamber 50 will flow back to the condensate connecting pipe 422 and then to the steam dynamic chamber 42, ensuring that all the pre-cooled condensate flows into the steam dynamic chamber 42 in time and then is discharged.
[0034] More preferably, the condensate storage chamber 50 is an arc-shaped pipe arranged at the wall of the rotary kiln body 10, and the condensate storage chamber 50 connected by the steam pipe unit group 30A arranged in the upstream sector area adjacent to the sector area is arranged in the sector area, and the condensate connecting pipe 422 is connected to the downstream end 50A of the condensate storage chamber 50.
[0035] As Figure 6As shown, assuming the rotary direction of the rotary kiln body 10 is counterclockwise, the condensate water storage chamber 50 at the lowest position is lower than the height of the steam pipeline unit group 30A connected thereto, i.e. the steam pipeline unit group 30A is located at the upper left position of the condensate water storage chamber 50 at the lowest position connected thereto, so that the condensate water in the steam pipeline unit group 30A can flow to the condensate water storage chamber 50 in time. Since the pipe diameter of the condensate water storage chamber 50 can be appropriately made larger, and the linear velocity of its movement is larger and easier to be cooled, it is beneficial to the rapid condensation of the unsaturated steam stored therein, which can avoid the unsaturated steam entering the steam driving chamber 42 to mix with the saturated steam to reduce the temperature of the saturated steam, thereby reducing the drying effect.
[0036] In addition, in order to avoid the mixing of unsaturated steam after heat exchange into the steam driving chamber 42, the condensate water connecting pipe 422 only communicates with the condensate water storage chamber 50 and the condensate water connecting pipe 422 does not communicate with the steam driving chamber 42, or the valve provided in the pipeline connecting the condensate water connecting pipe 422 and the steam driving chamber 42 is closed, and a communication pipeline is directly connected between the condensate water storage chamber 50 and the steam driving chamber 42, which can avoid the backflow of unsaturated steam after heat exchange to the steam driving chamber 42 to reduce the temperature of the saturated steam which has not been subjected to drying heat exchange.
[0037] Figure 7 、 8 In the middle, the small arrow is the flow direction of the condensate water, and the large arrow is the flow direction of the saturated steam. In order to smoothly discharge the condensate water in the steam driving chamber 42 through the condensate water drain pipe 70, a water pump can be connected to the downstream end of the condensate water drain pipe 70, or a vacuum pump can be connected to the downstream end of the condensate water drain pipe 70, first draining water with the condensate water drain pipe 70, then closing the water pump or the vacuum pump, and the pressure environment maintained by the saturated steam in the steam driving chamber 42 can form a siphon phenomenon to discharge the condensate water through the condensate water drain pipe 70, which can also save energy.
Claims
1. A steam piping system for a dry kiln, characterized by: The steam pipeline unit (30) is arranged in the barrel cavity of the rotary kiln body (10), the steam pipeline unit (30) comprises a steam inlet pipe (31) and a steam return pipe (32), the steam inlet pipe (31) and the steam return pipe (32) are parallel and consistent with the length direction of the rotary kiln body (10), the steam inlet pipe (31) and the steam return pipe (32) are communicated by an arc-shaped pipe (33), the arc-shaped pipe (33) is arranged in parallel and at intervals in the length direction of the steam inlet pipe (31) and the steam return pipe (32), the steam inlet end of the steam inlet pipe (31) and the steam outlet end of the steam return pipe (32) are located at the discharge end of the rotary kiln body (10), and the steam outlet end (321) of the steam return pipe (32) is communicated with the condensed water storage chamber (50). The steam distribution chamber (40) comprises a steam static chamber (41) and a steam dynamic chamber (42) communicated with a steam heat source, the steam static chamber (41) and the steam dynamic chamber (42) are rotationally and sealingly connected, the steam static chamber (41) is fixedly connected with the base frame and keeps a static state, and the steam dynamic chamber (42) is fixed at the tail end of the rotary kiln body (10) and synchronously rotates with the rotary kiln body (10). The steam inlet end (311) of the steam inlet pipe (31) is communicated with the steam dynamic chamber (42), the steam dynamic chamber (42) is connected with a radially arranged steam distribution pipe (421), and the steam distribution pipe (421) is communicated with the steam inlet end (311) of each steam inlet pipe (31) in the same steam pipeline unit group (30A). The condensed water storage chamber (50) is communicated to the steam dynamic chamber (42) by a condensed water connecting pipe (422), the steam outlet end (321) of the steam return pipe (32) in the same steam pipeline unit group (30A) is connected to the condensed water connecting pipe (422) in a reflux manner, a valve is arranged on the pipeline communicated between the condensed water connecting pipe (422) and the steam dynamic chamber (42), and a communication pipeline is directly connected between the condensed water storage chamber (50) and the steam dynamic chamber (42). The condensed water drainage pipe (70) extending to the bottom of the cavity of the steam dynamic chamber (42) penetrates through the communication cavity of the steam static chamber (41) and the steam dynamic chamber (42), the pipe wall of the condensed water drainage pipe (70) is arranged in a spaced manner with the steam dynamic chamber (42), and the outer end of the condensed water drainage pipe (70) extends to the outside of the steam static chamber (41).
2. The steam plumbing system of claim 1, wherein: The pipe end of the condensed water connecting pipe (422) in the steam dynamic chamber (42) is higher than the height of the inner end of the condensed water drainage pipe (70), and the pipe end of the steam distribution pipe (421) connected with the steam inlet end (311) of the steam inlet pipe (31) in the steam dynamic chamber (42) is higher than the liquid level of the condensed water.
3. The steam line system according to claim 1 or 2, characterized in that: The pipe end of the condensed water connecting pipe (422) protrudes from the cavity wall of the steam dynamic chamber (42).
4. The steam line system according to claim 1 or 2, characterized in that: The steam static chamber (41) and the steam dynamic chamber (42) are both cylindrical, and the cylinder cores of the two are coincident, and the cylinder diameter of the steam dynamic chamber (42) is greater than the pipe diameter of the connection part of the steam static chamber (41) and the steam dynamic chamber (42).
5. The steam plumbing system of claim 1, wherein: The rotary kiln body (10) is provided with a plurality of webs (60) arranged at intervals from the upstream end to the downstream end in the barrel cavity. The web (60) comprises a radial web (61) connected to the barrel wall of the rotary kiln body (10) at the outer end, and a circular ring plate (62) fixedly connected to the inner end of the radial web (61). The radial web (61) is arranged at 3-6 in the circumferential range. Two adjacent radial webs (61) and the circular ring plate (62) on the same web (60) and the inner wall of the rotary kiln body (10) form a sector area. The profiles of the sector areas at corresponding positions of the adjacent upstream and downstream sectors on the projection plane perpendicular to the barrel core of the rotary kiln body (10) coincide with each other. The steam inlet pipe (31) and the steam return pipe (32) of the same steam pipe unit (30) are respectively connected to two adjacent radial webs (61) forming the same sector area. The steam pipe units (30) are arranged at intervals from inside to outside in the radial range in the same sector area to form a steam pipe unit group (30A).
6. The steam plumbing system of claim 5, wherein: The condensate water storage chamber (50) is an arc-shaped pipe arranged at the furnace wall of the rotary kiln body (10). The condensate water storage chamber (50) connected to the steam pipe unit group (30A) arranged in the sector area is arranged at the adjacent upstream sector area of the sector area. The condensate water connection pipe (422) is connected to the downstream end (50A) of the condensate water storage chamber (50).
Citation Information
Patent Citations
Steam distribution chamber
CN103206849A
Rotating steam drier
CN104110947A
Steam dryer
CN104251607A