CN103471380B - Waste heat utilization process for rotary kilns - Google Patents
Waste heat utilization process for rotary kilns Download PDFInfo
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- CN103471380B CN103471380B CN201310371922.9A CN201310371922A CN103471380B CN 103471380 B CN103471380 B CN 103471380B CN 201310371922 A CN201310371922 A CN 201310371922A CN 103471380 B CN103471380 B CN 103471380B
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- oxygen content
- rotary kiln
- preset value
- utilization
- 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 waste heat recovery comprehensive utilization, develop a circular economy and meet national industrial policies, be conducive to promoting energy-saving and emission-reduction, improve Business Economic Benefit, environmental protect.Rotary kiln production technology is mainly 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.Simultaneously due to the limitation of current production technology, cause efficiency of utilization not high, a large amount of residual heat resources are wasted.Although residual heat resources utilize by way of varied with mode, often because of 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 on-line real-time measuremen, warning device, waste heat oxygen content of waste gas is utilized to carry out uninterrupted continuous on-line detection to system, guarantee hypoxemia operation, realize 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, comprises the steps:
The first step, tail gas udst separation after preheater preheats of rotary kiln body, the hot blast after purified treatment carries out oxygen content detection through detecting oxygen device, when oxygen content is when lower than preset value, enters second step; When oxygen content reaches preset value, warning device is reported to the police, simultaneously automatic makeup inflated with nitrogen, until oxygen content is lower than preset value;
Second step, delivers to oven dry coal mill system, then enters Pulverized Coal Bin by hot blast;
3rd step, coal dust is delivered to rotary kiln combustion system through dedicated pipeline, realizes UTILIZATION OF VESIDUAL HEAT IN.
As preferably, described Pulverized Coal Bin and dedicated pipeline are equipped with explosion-proof decompression device.
As preferably, in the hot blast of the described first step after purified treatment, heat source medium dust content is lower than 50mg/m
3.
As preferably, in the described first step, temperature >=120 DEG C of the hot blast after purified treatment, 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 oven dry coal mill system through Ф 600mm pipe crimping.
Beneficial effect of the present invention is:
1, the present invention is by the combination of UTILIZATION OF VESIDUAL HEAT IN demand and Environmental-protecting dust-removing technique, makes waste gas resource obtain purified treatment in advance on the one hand, makes unnecessary waste gas obtain depositing dust process on the other hand, realizes non-pollution discharge.
2, on-line real-time measuremen, warning device is set up, waste heat oxygen content of waste gas is utilized to carry out uninterrupted continuous on-line detection to system, export with information, alarm settings device, nitrogen automatically supplements add-on system and realize interlocking and link, guarantee hypoxemia operation, realize security of system safeguard function.
Accompanying drawing explanation
Fig. 1 is system flow chart of the present invention.
Detailed description of the invention
The present invention has carried out meticulous selection to heat supply source point: one is the heat energy and the temperature that meet technique needs, and drying coal dust needs temperature 120 DEG C-150 DEG C, and the too high surplus of temperature is unfavorable for the stable of system production operation; Two is heat energy security contexts that suitable inflammable bituminous coal grinds processing, and hypoxemia waste gas is advantageously in Operation control.Relative kiln hood and other residual heat resources, have dedusting tail gas only and can meet above two conditions simultaneously.Optimum condition of the present invention is thermophilic anaerobic condition, t >=120 DEG C, oxygen content≤12%(concentration expressed in percentage by volume).Relative to the high-temperature oxygen-enriched state of kiln hood position, the anoxic thermophilic of waste gas residual heat is more conducive to security of system requirement.
As shown in Figure 1, processing step of the present invention is as follows:
The first step, tail gas udst separation after preheater preheats of rotary kiln body, the waste heat exhaust gas and dust content after udst separation is reduced to 50mg/m
3below, the hot blast after purified treatment carries out oxygen content detection through detecting oxygen device, when oxygen content is when lower than preset value, enters second step; When oxygen content reaches preset value, warning device is reported to the police, and automatically supplements simultaneously and adds nitrogen, until oxygen content is lower than preset value.Preset value can be set as 16%, when higher than 16% time, warning device is reported to the police, and adding after nitrogen dilution, oxygen content being down to less than 12% from 16%, improve security parameter, thus solving the spontaneous combustion of pulverized coal problem in pulverized bituminous coal process by automatically supplementing.
Second step, delivers to oven dry coal mill system by hot blast through Ф 600mm pipe crimping, then enters Pulverized Coal Bin;
3rd step, coal dust is delivered to rotary kiln combustion system through Ф 159mm dedicated pipeline, realizes UTILIZATION OF VESIDUAL HEAT IN.Output dedicated pipeline and coal powder grinding arrange 5 cover separate flameproof pressure relief devices altogether.
The present invention sets up on-line real-time measuremen (detecting oxygen device), warning device, waste heat oxygen content of waste gas is utilized to carry out uninterrupted continuous on-line detection to system, export with information, alarm settings device, nitrogen automatically supplements add-on system and realize interlocking and link, guarantee hypoxemia operation, realize security of system safeguard function.
Invention increases the adaptive capacity of system to dissimilar raw coal, adapt to the particular requirement of rotary kiln fuel selection to fugitive constituent index, processing uses the upper limit Con trolling index of coal dust fugitive constituent to be not more than 25% and to be increased to by original and to be not more than 35%, 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, tail gas udst separation after preheater preheats of rotary kiln body, the hot blast after purified treatment carries out oxygen content detection through detecting oxygen device, when oxygen content is when lower than preset value, enters second step; When oxygen content reaches preset value, warning device is reported to the police, simultaneously automatic makeup inflated with nitrogen, until oxygen content is lower than preset value;
Second step, delivers to oven dry coal mill system, then enters Pulverized Coal Bin by hot blast;
3rd step, coal dust is delivered to 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: described Pulverized Coal Bin and dedicated pipeline are equipped with explosion-proof decompression device.
3. a kind of rotary kiln UTILIZATION OF VESIDUAL HEAT IN technique according to claim 1, is characterized in that: in the hot blast of the described first step after purified treatment, heat source medium dust content is lower than 50mg/m
3.
4. a kind of rotary kiln UTILIZATION OF VESIDUAL HEAT IN technique according to claim 1, it is characterized in that: in the described first step, temperature >=120 DEG C of the hot blast after purified treatment, 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, 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 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103471380A CN103471380A (en) | 2013-12-25 |
| CN103471380B true CN103471380B (en) | 2015-06-03 |
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ID=49796335
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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 (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
Family Cites Families (2)
| 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 |
| JP2010156314A (en) * | 2009-01-05 | 2010-07-15 | Toyota Motor Corp | Waste heat recovery device and engine |
-
2013
- 2013-08-23 CN CN201310371922.9A patent/CN103471380B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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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| CN103471380A (en) | 2013-12-25 |
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Granted publication date: 20150603 |