CN113200694A - Production process for reducing coal dilution and clinker heat consumption and improving coal powder heat value - Google Patents
Production process for reducing coal dilution and clinker heat consumption and improving coal powder heat value Download PDFInfo
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- CN113200694A CN113200694A CN202110580820.2A CN202110580820A CN113200694A CN 113200694 A CN113200694 A CN 113200694A CN 202110580820 A CN202110580820 A CN 202110580820A CN 113200694 A CN113200694 A CN 113200694A
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- clinker
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- 239000003245 coal Substances 0.000 title claims abstract description 91
- 239000000843 powder Substances 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 238000010790 dilution Methods 0.000 title claims abstract description 13
- 239000012895 dilution Substances 0.000 title claims abstract description 13
- 239000000428 dust Substances 0.000 claims abstract description 42
- 239000002817 coal dust Substances 0.000 claims abstract description 19
- 239000000779 smoke Substances 0.000 claims abstract description 16
- 238000001035 drying Methods 0.000 claims abstract description 13
- 239000002912 waste gas Substances 0.000 claims abstract description 8
- 239000011810 insulating material Substances 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 13
- 238000001354 calcination Methods 0.000 abstract description 6
- 239000004568 cement Substances 0.000 abstract description 5
- 238000002360 preparation method Methods 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 206010039509 Scab Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/44—Burning; Melting
- C04B7/4407—Treatment or selection of the fuel therefor, e.g. use of hazardous waste as secondary fuel ; Use of particular energy sources, e.g. waste hot gases from other processes
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/47—Cooling ; Waste heat management
- C04B7/475—Cooling ; Waste heat management using the waste heat, e.g. of the cooled clinker, in an other way than by simple heat exchange in the cement production line, e.g. for generating steam
Abstract
The invention provides a production process for reducing coal dilution and clinker heat consumption and improving coal powder heat value, belonging to the technical field of cement clinker production and comprising the following steps: step one, kiln tail waste gas enters a dust removal device, and drying hot air is obtained after dust removal treatment; step two, the drying hot air obtained in the step one enters a coal mill device, meanwhile, raw coal enters the coal mill device, and the drying hot air dries the raw coal to obtain pulverized coal smoke; and step three, the coal dust smoke obtained in the step two enters a dust collection device, the coal dust is separated from the smoke, the coal dust enters a coal dust bin, and the smoke is discharged from a chimney. The invention can not only fully remove the kiln dust brought by the hot air, reduce the coal quality dilution caused in the coal powder preparation process, but also improve the heat value of the coal powder, improve the coal quality, improve the fluidity of the coal powder, improve the working condition of a clinker calcining system, reduce the process accidents, improve the production quality of the clinker and reduce the coal consumption of the clinker under the condition that the raw coal entering the plant is unchanged.
Description
Technical Field
The invention relates to the technical field of cement clinker production, in particular to a production process for reducing coal dilution and clinker heat consumption and improving coal powder heat value.
Background
At present, most of coal mill systems of the novel dry-method cement clinker production line are arranged at the tail of a kiln, kiln tail waste gas is used as a drying heat source of the coal mill, and the dust content of the kiln tail waste gas is high. Taking a cement clinker production line producing 5000 tons per day as an example, kiln tail waste gas contains about 80g/Nm3 of dust, the waste gas is dedusted by a cyclone cylinder before entering a coal mill, the dedusting efficiency is less than 80%, so that part of raw material dust in the system is collected again from the kiln tail along with hot air and enters the coal mill, and the ash content of coal powder added with the raw material dust is 3.5% higher than that of the original coal powder, so that the heat value of the coal powder is reduced, the heat consumption of a cement kiln is improved, and the calorific value of the coal powder is reduced.
The coal dust dilution brings adverse effects to the calcination of clinker and is mainly reflected in three aspects: firstly, the heat value of the pulverized coal is directly reduced, a large amount of heat value is wasted, the temperature of a burning zone is not favorably improved, and energy is wasted while the production of high-quality clinker is difficult; secondly, most of the kiln dust mixed with the coal dust is undecomposed raw material powder, and the raw material powder is decomposed after being sprayed out of the combustor, so that a large amount of heat is absorbed, and the complete combustion of the coal dust is not facilitated. Especially, the incomplete combustion of the kiln tail coal powder can cause a large amount of crusts to form process accidents such as blockage of the preheater and the like. Thirdly, the raw material powder has high viscosity, and after the raw material powder is mixed into the coal powder, the raw material powder is accumulated in a coal powder bin, the fluidity is poor, the coal under a coal powder scale is unsmooth, the large fluctuation of the calcination working condition is further caused, the coal consumption is influenced, and the quality of clinker is reduced.
Disclosure of Invention
In view of the above, the invention provides a production process for reducing coal quality dilution and clinker heat consumption and improving coal powder heat value, which can not only fully remove kiln dust brought by hot air and reduce coal quality dilution caused in the coal powder preparation process, but also improve coal powder heat value, improve coal quality, improve coal powder fluidity, improve the working condition of a clinker calcination system, reduce process accidents, improve the clinker production quality and reduce the clinker coal consumption under the condition that raw coal entering a plant is unchanged.
In order to solve the technical problems, the invention provides a production process for reducing coal dilution and clinker heat consumption and improving coal powder heat value, which comprises the following steps:
step one, kiln tail waste gas enters a dust removal device, and drying hot air is obtained after dust removal treatment;
step two, the drying hot air obtained in the step one enters a coal mill device, meanwhile, raw coal enters the coal mill device, and the drying hot air dries the raw coal to obtain pulverized coal smoke;
and step three, the coal dust smoke obtained in the step two enters a dust collection device, the coal dust is separated from the smoke, the coal dust enters a coal dust bin, and the smoke is discharged from a chimney.
Furthermore, the dust removal device adopts a novel high-temperature closed type ash remover.
Further, novel airtight ash remover of high temperature include the ash remover body, set up in the inside filter bag dust removal mechanism of ash remover body, be equipped with air inlet and gas vent on the ash remover body.
Furthermore, the ash remover body is made of high-efficiency energy-saving heat-insulating materials.
Furthermore, the filter bag dust removal mechanism includes a plurality of filter bags, the filter bag is high temperature resistant material.
Further, a bag cage is arranged in the filter bag and arranged inside the ash remover body.
The technical scheme of the invention has the following beneficial effects:
1. the novel high-temperature closed ash remover replaces an original cyclone dust remover, fully removes kiln dust brought by hot air, effectively reduces coal quality dilution caused in the coal powder preparation process, reduces the ash content in a coal powder finished product under the condition that raw coal entering a factory is unchanged, improves the heat value of the coal powder, improves the coal quality, improves the flowability of the coal powder, improves the working condition of a clinker calcining system, reduces process accidents, improves the production quality of clinker and reduces the coal consumption of clinker;
2. the ash remover body is made of high-efficiency energy-saving heat-insulating materials, and compared with common heat-insulating materials, the ash remover has the characteristics of low heat conductivity coefficient, high heat-resisting temperature, better heat-insulating effect and low heat loss;
3. the space utilization rate is fully considered, the novel high-temperature closed ash remover is designed and installed at the position of an original cyclone cylinder according to the original bearing area, the size can be placed in the original building frame of the cyclone dust collector, the original cyclone dust collector can be directly replaced, original equipment such as an original conveyor, a rotary discharger and the like is fully utilized, the pipeline at the interface is only required to be locally adjusted, other pipelines, buildings and planning nearby a plant area are not affected, and the construction is convenient and fast;
4. the novel high-temperature closed ash remover fully considers the process characteristics of high inlet gas temperature and large fluctuation during design, and equipment such as a cold air valve, a temperature sensor, a spark catcher and the like are additionally arranged at the inlet of the dust collector, so that the safe operation is guaranteed;
5. the novel high-temperature closed ash remover system adopts an independent PLC control system, the control system comprises an on-site control cabinet, a PLC control cabinet and a junction box, the PLC control cabinet controls the whole system, receiving, calculating and transmitting remote signals are included, all signals can be displayed on site, and the PLC control cabinet can display and operate. In the normal operation process, the automatic control system can automatically adjust the temperature only by setting the inlet temperature of the ash remover in a central control mode, so that the complexity of the operation is greatly reduced;
6. the design of the novel high-temperature closed ash remover can design the resistance and the wind speed of the ash remover according to the model of the existing coal mill fan, so that the resistance of the ash remover is matched with the existing equipment, and the novel high-temperature closed ash remover can adapt to the original process equipment to the maximum extent.
Drawings
FIG. 1 is a process flow diagram of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
As shown in fig. 1: a production process for reducing coal quality dilution and clinker heat consumption and improving coal powder heat value comprises the following steps:
step one, kiln tail waste gas enters a dust removal device, and drying hot air is obtained after dust removal treatment;
step two, the drying hot air obtained in the step one enters a coal mill device, meanwhile, raw coal enters the coal mill device, and the drying hot air dries the raw coal to obtain pulverized coal smoke;
and step three, the coal dust smoke obtained in the step two enters a dust collection device, the coal dust is separated from the smoke, the coal dust enters a coal dust bin, and the smoke is discharged from a chimney.
According to one embodiment of the present invention, as shown in fig. 1, the dust removing apparatus employs a novel high-temperature closed type dust remover. The novel high-temperature closed ash remover comprises an ash remover body and a filter bag dust removing mechanism arranged inside the ash remover body, wherein an air inlet and an air outlet are arranged on the ash remover body, and a connecting pipeline is arranged on the air inlet and the air outlet. The ash remover body is made of high-efficiency energy-saving heat-insulating materials, and compared with common heat-insulating materials, the ash remover has the characteristics of low heat conductivity coefficient and high heat-resistant temperature, and has a better heat-insulating effect. The ash remover adopts a sealed design and is completely sealed, the air leakage rate is less than 1 percent, thereby ensuring that the temperature drop of hot air from an air inlet of the novel high-temperature sealed ash remover to a hot air inlet of the coal mill is controlled within 15 ℃, effectively utilizing the performance of the hot air, completely meeting the process requirements of original tightness and high temperature resistance of the ash collector, and not influencing the preparation process of pulverized coal. The novel high-temperature closed ash remover is used for replacing the original cyclone dust collector, the ash removing efficiency of the whole ash removing system can reach 99.9 percent, the ash collecting efficiency is greatly improved, and the novel high-temperature closed ash remover is not influenced by the resistivity and the resistance of dust.
According to another embodiment of the invention, as shown in fig. 1, the filter bag dust removing mechanism comprises 748 filter bags, and the filter bags are made of high temperature resistant materials. A bag cage is uniformly arranged in each filter bag, the bag cage is arranged in the ash remover body, and the bag cage plays a supporting role for the filter bag to ensure the normal work of the filter bag.
The novel high-temperature closed type ash remover is designed by fully considering the space utilization rate, and can be designed at the position of the original cyclone cylinder according to the original bearing area. The designed size of the dust collector can be placed in the building frame of the original cyclone dust collector, the original cyclone dust collector can be directly replaced, and original equipment such as an original conveyor and a rotary discharger can be fully utilized. Only local adjustment is needed for interface pipelines without affecting other pipelines, buildings and planning nearby plant areas.
The novel high-temperature closed ash remover fully considers the process characteristics of high inlet gas temperature and large fluctuation during design, and in order to ensure the safe operation of the dust collector, equipment such as a cold air valve, a temperature sensor, a spark catcher and the like are additionally arranged at the inlet of the dust collector. The novel high-temperature closed type ash remover instrument and the control equipment fully consider the maximum usability, reliability, controllability and maintainability. Under the specified conditions, all components should run safely and reach the instrument control equipment input rate of 100%, the protection and interlocking input rate of 100%, the automatic regulating system input utilization rate of 100% and the analytical instrument input rate of 100%.
The novel high-temperature closed ash remover system adopts an independent PLC control system, and the control system comprises an on-site control cabinet, a PLC control cabinet and a junction box. The PLC control cabinet controls the whole system, and the control comprises the receiving, the calculation and the transmission of remote signals. All signals can be displayed on site, and the PLC control cabinet can display and operate. In the normal operation process, only the inlet temperature of the ash remover needs to be set by the central control, the automatic temperature adjustment can be carried out by the automatic control system, and the complexity of the operation is greatly reduced.
The design of the novel high-temperature closed ash remover can design the resistance and the wind speed of the ash remover according to the model of the existing coal mill fan, so that the resistance of the ash remover is matched with the existing equipment, and the novel high-temperature closed ash remover can adapt to the original process equipment to the maximum extent. After transformation, because kiln dust brought in the grinding process is fully removed, the heat value of the coal powder discharged from grinding is improved by 280cal/g under the condition of the same raw coal, after the heat value of the coal powder is improved, the calcining system is obviously improved, the output and the quality of clinker are obviously improved, the coal consumption per ton of clinker is obviously reduced, and a good effect is obtained.
In the present invention, unless otherwise explicitly specified or limited, for example, it may be fixedly attached, detachably attached, or integrated; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. A production process for reducing coal quality dilution and clinker heat consumption and improving coal powder heat value is characterized by comprising the following steps:
step one, kiln tail waste gas enters a dust removal device, and drying hot air is obtained after dust removal treatment;
step two, the drying hot air obtained in the step one enters a coal mill device, meanwhile, raw coal enters the coal mill device, and the drying hot air dries the raw coal to obtain pulverized coal smoke;
and step three, the coal dust smoke obtained in the step two enters a dust collection device, the coal dust is separated from the smoke, the coal dust enters a coal dust bin, and the smoke is discharged from a chimney.
2. The production process for reducing coal dilution and clinker heat consumption and improving coal powder heat value according to claim 1 is characterized in that: the dust removing device adopts a novel high-temperature closed type ash remover.
3. The production process for reducing coal depletion and clinker heat consumption and improving coal powder calorific value according to claim 2, wherein the production process comprises the following steps: the novel high-temperature closed ash remover comprises an ash remover body and a filter bag dust removing mechanism arranged in the ash remover body, wherein an air inlet and an air outlet are formed in the ash remover body.
4. The production process for reducing coal depletion and clinker heat consumption and improving coal powder calorific value according to claim 3, wherein the production process comprises the following steps: the ash remover body is made of high-efficiency energy-saving heat-insulating materials.
5. The production process for reducing coal depletion and clinker heat consumption and improving coal powder calorific value according to claim 3, wherein the production process comprises the following steps: the filter bag dust removal mechanism comprises a plurality of filter bags, and the filter bags are made of high-temperature-resistant materials.
6. The production process for reducing coal depletion and clinker heat consumption and improving coal powder calorific value according to claim 5, wherein the production process comprises the following steps: a bag cage is arranged in the filter bag and arranged inside the ash remover body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110580820.2A CN113200694A (en) | 2021-05-26 | 2021-05-26 | Production process for reducing coal dilution and clinker heat consumption and improving coal powder heat value |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110580820.2A CN113200694A (en) | 2021-05-26 | 2021-05-26 | Production process for reducing coal dilution and clinker heat consumption and improving coal powder heat value |
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| CN113200694A true CN113200694A (en) | 2021-08-03 |
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| CN202110580820.2A Pending CN113200694A (en) | 2021-05-26 | 2021-05-26 | Production process for reducing coal dilution and clinker heat consumption and improving coal powder heat value |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT8020051A0 (en) * | 1979-06-06 | 1980-02-20 | Heidelberger Zement Ag | A COMBINATION FEEDING PROCESS OF A COAL PROCESS WITH HIGH GRINDING, DRYING AND HEAT RECOVERY. |
| CN101173837A (en) * | 2008-02-03 | 2008-05-07 | 江苏中科节能环保技术有限公司 | Macrotype cement kiln flue gas managing technique and device thereof |
| CN203043752U (en) * | 2012-12-17 | 2013-07-10 | 安徽省元琛环保科技有限公司 | Pulse ash removing bag type dust collector |
| CN204555718U (en) * | 2015-03-30 | 2015-08-12 | 中建材（合肥）环境与资源科技有限公司 | Cement kiln end waste gas dries coal mill deliming system |
| WO2017024247A1 (en) * | 2015-08-06 | 2017-02-09 | Calportland Company | Use of clinker kiln dust for gas scrubbing |
| CN207694456U (en) * | 2017-12-15 | 2018-08-07 | 湖州煤山南方水泥有限公司 | A kind of kiln tail gas multistage temperature bag dust arrester installation |
| CN212645389U (en) * | 2020-07-11 | 2021-03-02 | 成都天宇飞翔科技有限责任公司 | Preheating device with high-temperature bag dust collection function |
-
2021
- 2021-05-26 CN CN202110580820.2A patent/CN113200694A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT8020051A0 (en) * | 1979-06-06 | 1980-02-20 | Heidelberger Zement Ag | A COMBINATION FEEDING PROCESS OF A COAL PROCESS WITH HIGH GRINDING, DRYING AND HEAT RECOVERY. |
| CN101173837A (en) * | 2008-02-03 | 2008-05-07 | 江苏中科节能环保技术有限公司 | Macrotype cement kiln flue gas managing technique and device thereof |
| CN203043752U (en) * | 2012-12-17 | 2013-07-10 | 安徽省元琛环保科技有限公司 | Pulse ash removing bag type dust collector |
| CN204555718U (en) * | 2015-03-30 | 2015-08-12 | 中建材（合肥）环境与资源科技有限公司 | Cement kiln end waste gas dries coal mill deliming system |
| WO2017024247A1 (en) * | 2015-08-06 | 2017-02-09 | Calportland Company | Use of clinker kiln dust for gas scrubbing |
| CN207694456U (en) * | 2017-12-15 | 2018-08-07 | 湖州煤山南方水泥有限公司 | A kind of kiln tail gas multistage temperature bag dust arrester installation |
| CN212645389U (en) * | 2020-07-11 | 2021-03-02 | 成都天宇飞翔科技有限责任公司 | Preheating device with high-temperature bag dust collection function |
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Application publication date: 20210803 |