CN104437817A - Method for reducing number of times of thermal resistor failures at coal milling outlet - Google Patents
Method for reducing number of times of thermal resistor failures at coal milling outlet Download PDFInfo
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- CN104437817A CN104437817A CN201410697187.5A CN201410697187A CN104437817A CN 104437817 A CN104437817 A CN 104437817A CN 201410697187 A CN201410697187 A CN 201410697187A CN 104437817 A CN104437817 A CN 104437817A
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- coal
- thermal resistance
- thermal resistor
- measuring point
- stoppages
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Abstract
The invention discloses a method for reducing the number of times of thermal resistor failures at a coal milling outlet. The method comprises the following steps: adjusting the positions of temperature measuring points, and reducing the milling and erosion of fine materials to a thermal resistor; additionally arranging a mesh screen on a raw coal scale for screening off massive waste rocks. The method for reducing the number of times of thermal resistor failures at the coal milling outlet, disclosed by the invention, can overcome the defects of high failure rate, short service life, high maintenance cost and the like in the prior art, so as to realize the advantages of low failure rate, long service life and low maintenance cost.
Description
Technical field
The present invention relates to cement processing technique field, particularly, relate to a kind of method reducing the coal disintegrating outlet thermal resistance number of stoppages.
Background technology
Since 2012, the thermal resistance being related to the measurement coal disintegrating outlet coal dust temperature of whole pulverized coal preparation process safety frequently breaks down, and causes coal mill system safety interlocking stop jumping, has a strong impact on the normal continuously of production and runs.
My subsidiary factory of company two coal mill mair motor (category-A electrical equipment) number of stoppages is higher, find through our group's investigation: in the safe preparation process of whole coal dust, the temperature measuring coal disintegrating outlet coal dust is most important, spontaneous combustion will be caused then explosion caused if the temperature of coal disintegrating outlet coal dust exceedes certain safety value.A thermal resistance has been installed to measure the temperature of coal dust and be provided with safety interlocking on coal mill working procedure at coal disintegrating outlet for this reason.This thermal resistance breaks down frequently just, just causes coal mill system safety interlocking stop jumping, has a strong impact on the normal continuously of production and runs.
Thermal resistance number of stoppages statistical form
In order to better analysis of failure, find the main cause causing thermal resistance fault, we have carried out adding up causing several reasons of thermal resistance fault and have depicted fault Pareto diagram.Thermal resistance fault statistics table:
| Sequence number | Project | Frequency (secondary) | Cumulative frequencies (secondary) | Cumulative percentage (%) |
| 1 | Pillar is worn out | 21 | 21 | 70.0％ |
| 2 | Wiring gets loose | 5 | 26 | 86.7％ |
| 3 | Extended line breaks | 2 | 28 | 93.3％ |
| 4 | Pillar comes off | 1 | 29 | 96.7％ |
| 5 | Other | 1 | 30 | 100％ |
The worn out fault of pillar 21 times, accounts for institute out of order 70%, therefore can determine to cause the high main cause of the thermal resistance number of stoppages be: thermal resistance pillar is worn out.
Realizing in process of the present invention, inventor finds at least to exist in prior art the defect such as fault rate is high, service life is short and maintenance cost is high.
Summary of the invention
The object of the invention is to, for the problems referred to above, propose a kind of method reducing the coal disintegrating outlet thermal resistance number of stoppages, to realize the low advantage of failure rate is low, long service life and maintenance cost.
For achieving the above object, the technical solution used in the present invention is: a kind of method reducing the coal disintegrating outlet thermal resistance number of stoppages, comprising:
A, adjustment temperature point position, reduce powder to the abrasion of thermal resistance;
B, to deserve to be called at raw coal and install mesh screen additional, screen out the spoil of bulk.
Further, described step a, specifically comprises:
Carry out theory calculate according to the pipeline of on-the-spot coal mill coal powder conveying system and determine best measuring point;
Again open according to theoretical value and cut new measuring point, and at new measuring point installation and debugging thermal resistance.
Further, described step b, specifically comprises:
The width of mesh of field trial determination mesh screen;
Deserve to be called at raw coal and install mesh screen additional.
The method of the reduction coal disintegrating outlet thermal resistance number of stoppages of various embodiments of the present invention, owing to comprising: adjustment temperature point position, reduces powder to the abrasion of thermal resistance; Deserve to be called at raw coal and install mesh screen additional, screen out the spoil of bulk; Thus the defect that in prior art, fault rate is high, service life is short and maintenance cost is high can be overcome, to realize the low advantage of failure rate is low, long service life and maintenance cost.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from description, or understand by implementing the present invention.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for description, together with embodiments of the present invention for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the structural representation of coal mill system in the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
According to the embodiment of the present invention, as shown in Figure 1, a kind of method reducing the coal disintegrating outlet thermal resistance number of stoppages is provided.
Gameeing of technical solution of the present invention: group member, after determining essential factor, has carried out sufficient discussion, determines effectively the most feasible schemes of countermeasures.
the countermeasure of technical solution of the present invention is implemented:
Implement one: reselect temperature point position.
1. carry out theory calculate according to the pipeline of on-the-spot coal mill coal powder conveying system and determine best measuring point.
Check that we know through scene, coal mill mill body is east-west, entrance is exporting in the east in west, outlet is level, temperature point place pipeline is vertical, connected by the circular arc bend pipe of a section 90 degree between the two, go out coal-grinding powder and in pipe, do curvilinear motion along circular arc under the drive of air, at this moment, coal dust can be subject to the effect of centrifugal force, move towards the direction away from the circular arc center of circle, computing formula according to centrifugal force: F=mv2/r (m=quality, unit kilogram v=speed, unit metre per second (m/s), r=centrifugal motion radius, unit rice) known quality is larger, the centrifugal force be subject to is larger, space clustering in the pipe in the direction (west in pipe) away from the circular arc center of circle, therefore the large granular materials (being mainly spoil) in coal dust mainly passes through pipeline along space, west in pipe, the large granular materials that so in pipe, space is passed through in the east just should be little, therefore we determine that new temperature point should be arranged on the right opposite of original measuring point and the east wall of pipe.
2. again open according to theoretical value and cut new measuring point, and at new measuring point installation and debugging thermal resistance.
When stopping mill maintenance, we invite the colleague of flight-line maintenance to help us on old measuring point opposing pipe wall, use the measuring point that oxygen welding one is new, and good for old measuring point soldering.On new measuring point, we reinstall new thermal resistance and have carried out debugging calibration.See Fig. 1.
Implementation result: the good thermal resistance of installation and debugging, in the normal operation of coal mill, after one week, we check the abrasion situation of the thermal resistance pillar of new measuring point, substantially do not hear that granule materials impacts Pi crack the sound that sends of thermal resistance with ear thermal resistance of moving close to, grasp thermal resistance and just feel have granule materials to impact thermal resistance once in a while, thermal resistance is released in pipe and checks that pillar only finds that there is slight polishing scratch on pillar surface, can judge that new point position is selected correct thus, decrease granule materials abrasion thermal resistance, Small object reaches!
Implement two: deserve to be called at raw coal and install mesh screen additional.
1. the width of mesh of field trial determination mesh screen.
We are with the person skilled of consulting technique and visited the old employee that some are familiar with mill condition especially, known to their experience, spoil diameter grinding after grinding through coal below 100 millimeters becomes fine powder finally substantially, and the spoil only having diameter to be greater than more than 100 millimeters can exist some fully not levigate particles after the grinding of coal mill.We are tentatively designed to 100*100 millimeter the mesh of mesh screen accordingly.
2. deserve to be called at raw coal and install mesh screen additional.
After determining the size of sieve mesh; we utilize claim feed opening installs screen cloth at raw coal downtime; we are welded into the steel bar of 15 mm dias " well " font screen cloth that mesh is 100*100 millimeter; and then screen cloth is welded on raw coal claims on feed opening; like this, the spoil of bulk is stopped by screen cloth and would not enter coal and ground.Figure below is the screen cloth that we have welded.
Implementation result: install screen cloth after 3 days, we check the action effect of screen cloth, after first we see and install screen cloth, is mixed in the spoil that diameter in raw coal is greater than more than 100 millimeters and has substantially been sifted out by screen cloth.
Sample some coal dusts from the sample tap in powder concentrator coarse fodder exit to observe, find coal dust uniform and smooth, have no the spoil particle containing large.Again extract the inspection of 5 increment Pin Song total activation relevant departments by the method sampled on time, the results are shown in following table.From data in table, coal dust spoil granule content meets standard, spoil granule content table:
Last it is noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. reduce a method for the coal disintegrating outlet thermal resistance number of stoppages, it is characterized in that, comprising:
A, adjustment temperature point position, reduce powder to the abrasion of thermal resistance;
B, to deserve to be called at raw coal and install mesh screen additional, screen out the spoil of bulk.
2. the method for the reduction coal disintegrating outlet thermal resistance number of stoppages according to claim 1, it is characterized in that, described step a, specifically comprises:
Carry out theory calculate according to the pipeline of on-the-spot coal mill coal powder conveying system and determine best measuring point;
Again open according to theoretical value and cut new measuring point, and at new measuring point installation and debugging thermal resistance.
3. the method for the reduction coal disintegrating outlet thermal resistance number of stoppages according to claim 1 and 2, it is characterized in that, described step b, specifically comprises:
The width of mesh of field trial determination mesh screen;
Deserve to be called at raw coal and install mesh screen additional.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410697187.5A CN104437817A (en) | 2014-11-26 | 2014-11-26 | Method for reducing number of times of thermal resistor failures at coal milling outlet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410697187.5A CN104437817A (en) | 2014-11-26 | 2014-11-26 | Method for reducing number of times of thermal resistor failures at coal milling outlet |
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| CN104437817A true CN104437817A (en) | 2015-03-25 |
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| CN201410697187.5A Pending CN104437817A (en) | 2014-11-26 | 2014-11-26 | Method for reducing number of times of thermal resistor failures at coal milling outlet |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104785332A (en) * | 2015-04-10 | 2015-07-22 | 广西鱼峰水泥股份有限公司 | Selecting method for temperature measuring point at outlet of ball mill |
| CN105921250A (en) * | 2016-04-26 | 2016-09-07 | 韦国思 | Spontaneous combustion prevention structure of coal mill |
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| CN201711181U (en) * | 2010-05-27 | 2011-01-19 | 济南市琦泉热电有限责任公司 | Thermal power station coal-slurry sludge and raw coal mixed fuel feeding breaking system |
| CN202647831U (en) * | 2012-06-20 | 2013-01-02 | 绍兴市嘉宝节能新技术有限公司 | Chain boiler dusting combustion supporting device and programmable logic controller (PLC) centralized control system thereof |
| CN203379969U (en) * | 2013-08-07 | 2014-01-08 | 国家电网公司 | Pebble coal discharge device of medium speed mill |
| CN103495488A (en) * | 2013-10-18 | 2014-01-08 | 南京钢铁股份有限公司 | Full automatic control method and system for blast furnace pulverizing systems |
| CN103909006A (en) * | 2013-01-08 | 2014-07-09 | 宝山钢铁股份有限公司 | Method for detecting deflagration in coal mill outlet coal dust pipeline, and detection system thereof |
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2014
- 2014-11-26 CN CN201410697187.5A patent/CN104437817A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201711181U (en) * | 2010-05-27 | 2011-01-19 | 济南市琦泉热电有限责任公司 | Thermal power station coal-slurry sludge and raw coal mixed fuel feeding breaking system |
| CN202647831U (en) * | 2012-06-20 | 2013-01-02 | 绍兴市嘉宝节能新技术有限公司 | Chain boiler dusting combustion supporting device and programmable logic controller (PLC) centralized control system thereof |
| CN103909006A (en) * | 2013-01-08 | 2014-07-09 | 宝山钢铁股份有限公司 | Method for detecting deflagration in coal mill outlet coal dust pipeline, and detection system thereof |
| CN203379969U (en) * | 2013-08-07 | 2014-01-08 | 国家电网公司 | Pebble coal discharge device of medium speed mill |
| CN103495488A (en) * | 2013-10-18 | 2014-01-08 | 南京钢铁股份有限公司 | Full automatic control method and system for blast furnace pulverizing systems |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104785332A (en) * | 2015-04-10 | 2015-07-22 | 广西鱼峰水泥股份有限公司 | Selecting method for temperature measuring point at outlet of ball mill |
| CN105921250A (en) * | 2016-04-26 | 2016-09-07 | 韦国思 | Spontaneous combustion prevention structure of coal mill |
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Application publication date: 20150325 |