CN103471380A - Waste heat utilization process for rotary kilns - Google Patents
Waste heat utilization process for rotary kilns Download PDFInfo
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- CN103471380A CN103471380A CN2013103719229A CN201310371922A CN103471380A CN 103471380 A CN103471380 A CN 103471380A CN 2013103719229 A CN2013103719229 A CN 2013103719229A CN 201310371922 A CN201310371922 A CN 201310371922A CN 103471380 A CN103471380 A CN 103471380A
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- oxygen content
- rotary kiln
- preset value
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- vesidual heat
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Abstract
The invention discloses a waste heat utilization process for rotary kilns. The process includes the steps of firstly, preheating tail gas of a body of a rotary kiln by a preheater, removing dust, purifying, subjecting purified hot gas to oxygen content detection by an oxygen detector, and entering a second step when oxygen content is lower than a preset value; allowing an alarm to warn when the oxygen content reaches the preset value, and automatically supplying and adding nitrogen till the oxygen content is lower than a preset value; secondly, supplying the hot gas to a drying coal mill system, and feeding pulverized coal into a pulverized coal bunker; thirdly, conveying the pulverized coal to a rotary kiln combustion system through a special pipeline to allow waste heat utilization. According to the process, waste heat utilization and waste gas treatment are combined, the online real-time detection and alarm device is added, waste heat, waste gas and oxygen content used by the system are detected continuously online, low-oxygen operation is guaranteed, and the system is safeguarded.
Description
Technical field
The present invention is mainly used in the waste heat recovery of lime production industry or utilizes field, is specifically related to a kind of rotary kiln UTILIZATION OF VESIDUAL HEAT IN technique.
Background technology
Carry out the waste heat recovery comprehensive utilization, develop a circular economy and meet national industrial policies, be conducive to promote energy-saving and emission-reduction, improve Business Economic Benefit, improve environment.The rotary kiln production technology is mainly passed through CaCO
2decomposes discharges CO
2obtain final products, i.e. industrial active lime, chemical molecular formula: CaO, a large amount of heat energy of production process consumption.Due to the limitation of current production technology, cause efficiency of utilization not high, a large amount of residual heat resources are wasted simultaneously.Although residual heat resources utilize by way of varied with mode, often, because of the scale restriction, the level of utilization and ability are generally on the low side.
Summary of the invention
By Given this, the invention provides a kind of rotary kiln UTILIZATION OF VESIDUAL HEAT IN technique, UTILIZATION OF VESIDUAL HEAT IN and waste gas purification are combined, set up online detection, warning device in real time, to system, utilize the waste heat oxygen content of waste gas to carry out uninterrupted continuous on-line detection, guarantee the hypoxemia operation, realize the security of system safeguard function.
To achieve these goals, the present invention is by the following technical solutions:
A kind of rotary kiln UTILIZATION OF VESIDUAL HEAT IN technique, comprise the steps:
The first step, the udst separation after the preheater preheating of the tail gas of rotary kiln body, the hot blast after purified treatment carries out the oxygen content detection through detecting oxygen device, when oxygen content, lower than preset value the time, enters second step; When oxygen content reaches preset value, warning device is reported to the police, and automatically supplements and adds nitrogen simultaneously, until oxygen content is lower than preset value;
Second step, deliver to the oven dry coal mill system by hot blast, then enters Pulverized Coal Bin;
The 3rd step, coal dust is delivered to the rotary kiln combustion system through dedicated pipeline, realizes UTILIZATION OF VESIDUAL HEAT IN.
As preferably, on described Pulverized Coal Bin and dedicated pipeline, be equipped with explosion-proof decompression device.
As preferably, in the hot blast of the described first step after purified treatment, the heat source medium dust content is lower than 50mg/m
3below.
As preferably, in the described first step, the temperature of the hot blast after purified treatment >=120 ℃, oxygen content≤12%, in concentration expressed in percentage by volume.
As preferably, the preset value of described oxygen content is 16%.
As preferably, in described second step, hot blast is transported to the oven dry coal mill system through Ф 600mm pipe crimping.
Beneficial effect of the present invention is:
1, the present invention, by the combination of UTILIZATION OF VESIDUAL HEAT IN demand and Environmental-protecting dust-removing technique, makes the waste gas resource obtain purified treatment in advance on the one hand, makes on the other hand unnecessary waste gas obtain depositing dust and processes, and realizes non-pollution discharge.
2, set up online detection, warning device in real time, to system, utilize the waste heat oxygen content of waste gas to carry out uninterrupted continuous on-line detection, automatically supplement add-on system with information output, alarm settings device, nitrogen and realize the interlocking interlock, guarantee the hypoxemia operation, realize the security of system safeguard function.
The accompanying drawing explanation
Fig. 1 is system flow chart of the present invention.
The specific embodiment
The present invention has carried out meticulous selection to the heat supply source point: the one, meet heat energy and the temperature of technique needs, and drying coal dust needs 120 ℃-150 ℃ of temperature, and the excess Temperature surplus is unfavorable for the stable of system production operation; The 2nd, suitable inflammable bituminous coal grinds the heat energy security context of processing, and hypoxemia waste gas more is conducive to operation and controls.Kiln hood and other residual heat resources, have dedusting tail gas only and can meet above two conditions simultaneously relatively.Optimum condition of the present invention is the thermophilic anaerobic condition, t >=120 ℃, oxygen content≤12%(concentration expressed in percentage by volume).With respect to the high-temperature oxygen-enriched state of kiln hood position, the anoxic thermophilic of waste gas residual heat is more conducive to the security of system requirement.
As shown in Figure 1, processing step of the present invention is as follows:
The first step, the udst separation after the preheater preheating of the tail gas of rotary kiln body, the waste heat exhaust gas and dust content after udst separation is reduced to 50mg/m
3below after, the hot blast after purified treatment carries out the oxygen content detection through detecting oxygen device, when oxygen content, lower than preset value the time, enters second step; When oxygen content reaches preset value, warning device is reported to the police, and automatically supplements and adds nitrogen simultaneously, until oxygen content is lower than preset value.Preset value can be set as 16%, and when higher than 16% the time, warning device is reported to the police, and by after automatically supplementing and adding nitrogen dilution, oxygen content is down to below 12% from 16%, has improved security parameter, thereby has solved the spontaneous combustion of pulverized coal problem in the pulverized bituminous coal process.
Second step, deliver to the oven dry coal mill system by hot blast through Ф 600mm pipe crimping, then enters Pulverized Coal Bin;
The 3rd step, coal dust is delivered to the rotary kiln combustion system through Ф 159mm dedicated pipeline, realizes UTILIZATION OF VESIDUAL HEAT IN.Output dedicated pipeline and coal powder grinding arrange the independent explosion-proof decompression device of 5 cover altogether.
The present invention sets up online (detecting oxygen device), the warning device of detecting in real time, to system, utilize the waste heat oxygen content of waste gas to carry out uninterrupted continuous on-line detection, automatically supplement add-on system with information output, alarm settings device, nitrogen and realize the interlocking interlock, guarantee the hypoxemia operation, realize the security of system safeguard function.
The present invention has improved the adaptive capacity of system to dissimilar raw coal, adapt to rotary kiln fuel and select the particular requirement to the fugitive constituent index, processing is used the upper limit of coal dust fugitive constituent to control index and is not more than 25% and is increased to and is not more than 35% by original, has widened the scope of application of raw coal kind.
Claims (6)
1. a rotary kiln UTILIZATION OF VESIDUAL HEAT IN technique, is characterized in that: comprise the steps:
The first step, the udst separation after the preheater preheating of the tail gas of rotary kiln body, the hot blast after purified treatment carries out the oxygen content detection through detecting oxygen device, when oxygen content, lower than preset value the time, enters second step; When oxygen content reaches preset value, warning device is reported to the police, and automatically supplements and adds nitrogen simultaneously, until oxygen content is lower than preset value;
Second step, deliver to the oven dry coal mill system by hot blast, then enters Pulverized Coal Bin;
The 3rd step, coal dust is delivered to the rotary kiln combustion system through dedicated pipeline, realizes UTILIZATION OF VESIDUAL HEAT IN.
2. a kind of rotary kiln UTILIZATION OF VESIDUAL HEAT IN technique according to claim 1, is characterized in that: on described Pulverized Coal Bin and dedicated pipeline, be equipped with explosion-proof decompression device.
3. a kind of rotary kiln UTILIZATION OF VESIDUAL HEAT IN technique according to claim 1, it is characterized in that: in the hot blast of the described first step after purified treatment, the heat source medium dust content is lower than 50mg/m
3below.
4. a kind of rotary kiln UTILIZATION OF VESIDUAL HEAT IN technique according to claim 1 is characterized in that: in the described first step, and the temperature of the hot blast after purified treatment >=120 ℃, oxygen content≤12%, in concentration expressed in percentage by volume.
5. a kind of rotary kiln UTILIZATION OF VESIDUAL HEAT IN technique according to claim 1, it is characterized in that: the preset value of described oxygen content is 16%.
6. a kind of rotary kiln UTILIZATION OF VESIDUAL HEAT IN technique according to claim 1, it is characterized in that: in described second step, hot blast is transported to the oven dry coal mill system through Ф 600mm pipe crimping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310371922.9A CN103471380B (en) | 2013-08-23 | 2013-08-23 | Waste heat utilization process for rotary kilns |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310371922.9A CN103471380B (en) | 2013-08-23 | 2013-08-23 | Waste heat utilization process for rotary kilns |
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| CN103471380A true CN103471380A (en) | 2013-12-25 |
| CN103471380B CN103471380B (en) | 2015-06-03 |
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| CN201310371922.9A Expired - Fee Related CN103471380B (en) | 2013-08-23 | 2013-08-23 | Waste heat utilization process for rotary kilns |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0849820A (en) * | 1994-08-03 | 1996-02-20 | Mitsui Eng & Shipbuild Co Ltd | Device and method for treating waste |
| CN201335608Y (en) * | 2008-12-15 | 2009-10-28 | 鞍钢股份有限公司 | Waste heat utilization device for burning waste gas of annealing furnace |
| JP2010156314A (en) * | 2009-01-05 | 2010-07-15 | Toyota Motor Corp | Waste heat recovery device and engine |
| CN102878820A (en) * | 2012-10-22 | 2013-01-16 | 徐州燃控科技股份有限公司 | Application process of smoke recirculation on rotary kiln |
-
2013
- 2013-08-23 CN CN201310371922.9A patent/CN103471380B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0849820A (en) * | 1994-08-03 | 1996-02-20 | Mitsui Eng & Shipbuild Co Ltd | Device and method for treating waste |
| CN201335608Y (en) * | 2008-12-15 | 2009-10-28 | 鞍钢股份有限公司 | Waste heat utilization device for burning waste gas of annealing furnace |
| JP2010156314A (en) * | 2009-01-05 | 2010-07-15 | Toyota Motor Corp | Waste heat recovery device and engine |
| CN102878820A (en) * | 2012-10-22 | 2013-01-16 | 徐州燃控科技股份有限公司 | Application process of smoke recirculation on rotary kiln |
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|---|---|
| CN103471380B (en) | 2015-06-03 |
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Granted publication date: 20150603 |