CN113654345A - Operation method for pollution-free ignition temperature rise of rotary kiln - Google Patents
Operation method for pollution-free ignition temperature rise of rotary kiln Download PDFInfo
- Publication number
- CN113654345A CN113654345A CN202110968066.XA CN202110968066A CN113654345A CN 113654345 A CN113654345 A CN 113654345A CN 202110968066 A CN202110968066 A CN 202110968066A CN 113654345 A CN113654345 A CN 113654345A
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- Prior art keywords
- ignition
- kiln
- temperature rise
- rotary kiln
- temperature
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000003245 coal Substances 0.000 claims abstract description 33
- 239000000779 smoke Substances 0.000 claims abstract description 16
- 238000002485 combustion reaction Methods 0.000 claims abstract description 13
- 239000000428 dust Substances 0.000 claims abstract description 13
- 238000011017 operating method Methods 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims description 15
- 239000011819 refractory material Substances 0.000 claims description 12
- 239000011449 brick Substances 0.000 claims description 9
- 239000002283 diesel fuel Substances 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 5
- 230000007613 environmental effect Effects 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 3
- 238000004939 coking Methods 0.000 abstract description 2
- 230000000630 rising effect Effects 0.000 abstract 1
- 239000000843 powder Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 239000000571 coke Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000003570 air Substances 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
Abstract
The invention discloses an operating method of pollution-free ignition temperature rise of a rotary kiln, which comprises the steps of establishing a temperature rise curve so as to ensure the temperature rise time, and only rising and reducing the stable temperature accurately; adjusting equipment before ignition to reduce system draught; and the equipment after ignition is operated to adjust the air quantity to ensure the full combustion of the pulverized coal. According to the invention, no extra equipment cost is required, and the whole process of ignition and temperature rise of the rotary kiln can be free of pollution only by adjusting the operation mode of ignition and temperature rise, so that the phenomenon of black smoke emission is avoided; the working condition of the kiln tail bag dust collector is not influenced, and the blocking phenomenon that the filter bag is not ventilated smoothly due to the fact that the adhered dust is not easy to drop because water is adhered to the filter bag is avoided; meanwhile, the phenomenon of coking and material blockage in the feeding process is avoided, and the feeding process of the rotary kiln is safely finished.
Description
Technical Field
The invention belongs to the technical field of rotary kilns, and relates to an operating method for pollution-free ignition and temperature rise of a rotary kiln.
Background
In cement production enterprises, in the process of ignition and temperature rise of a rotary kiln each time, an ignition natural exhaust air valve needs to be opened, a chimney draws air naturally, oil and coal co-combustion is complete, and the system does not have the phenomenon of coal collection and after-combustion; the disadvantage is that the ignition chimney emits smoke and does not meet the environmental protection requirement; therefore, it is necessary to improve the ignition heating operation procedure, adjust the operation method, avoid the smoke emission of the ignition chimney and meet the requirement of environmental protection.
Disclosure of Invention
The invention aims to solve the problem that the ignition chimney emits smoke to pollute the environment in the prior art, improve the ignition heating operation process of the rotary kiln, adjust the ignition heating operation method of the rotary kiln and be suitable for the ignition heating process of the rotary kiln for cement production.
The technical scheme adopted by the invention is as follows:
a pollution-free ignition temperature rise operation method of a rotary kiln comprises the steps of establishing a temperature rise curve to ensure the temperature rise time and stabilize the temperature rise without reduction; adjusting equipment before ignition to reduce system draught; and the equipment after ignition is operated to adjust the air quantity to ensure the full combustion of the pulverized coal.
Aiming at the formulation of the temperature-rising curve, the temperature-rising curve is formulated according to the overhaul condition of the rotary kiln and the environmental temperature, particularly, the replacement of refractory bricks in the rotary kiln is less than or equal to 1/3, the replacement of refractory materials of a preheater is less than or equal to 1/5, and the temperature rise is ensured to be more than 16 hours; the refractory brick is replaced by less than or equal to 2/3, the refractory material of the preheater is replaced by less than or equal to 2/5, and the temperature is raised for more than 24 hours; the refractory bricks are replaced in the whole kiln, the refractory material of the preheater is replaced by less than or equal to 3/5, and the temperature rise is ensured to be more than 32 hours.
Aiming at the equipment adjustment before ignition, the specific operation comprises a first mode of reducing the starting frequency of a kiln tail exhaust fan; and in the second mode, the kiln tail bag dust collection cold air valve is opened, and in the third mode, the opening proportion of the ignition chimney is reduced.
Preferably, the starting frequency of the kiln tail exhaust fan is reduced from the original 10Hz to 5Hz, wherein the opening degree of a valve plate of the exhaust fan is closed to 10% from the original 100%.
Alternatively, the second mode is that the cold air valve of the raw material mill system is used for adjustment.
Preferably, in the third mode, the valve plate of the ignition chimney is opened by 50% or 30%, so that negative pressure always exists at the chimney valve, and the ignition chimney does not smoke when being observed on site or monitored by camera shooting.
For the operation of the equipment after ignition, the specific operation comprises the following steps:
step one, after diesel oil is ignited, prolonging the kiln drying time of the diesel oil until the temperature of a smoke chamber rises to 200 ℃, and then burning with pulverized coal;
step two, the kiln head exhaust fan is started in advance, and when the temperature of the kiln tail smoke chamber rises to be more than or equal to 600 ℃, the kiln head exhaust fan is started along with the increase of the coal feeding at the kiln head;
step three, increasing the air quantity of a primary fan and the air quantity of the kiln head coal feeding after a kiln head exhaust fan is started in advance;
in this process, the valve plate of the ignition chimney is gradually closed, and finally, the ignition chimney is completely closed.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the invention, no extra equipment cost is required, and the whole process of ignition and temperature rise of the rotary kiln can be free of pollution only by adjusting the operation mode of ignition and temperature rise, so that the phenomenon of black smoke emission is avoided; the working condition of the kiln tail bag dust collector is not influenced, and the blocking phenomenon that the filter bag is not ventilated smoothly due to the fact that water is attached to the filter bag and is not easy to fall off is avoided; the rotary kiln feeding process is safely completed, and the phenomenon of coke blocking is avoided.
2. According to the method, in each ignition heating process, a heating curve is specified according to the amount of the refractory materials replaced in the rotary kiln, the heating time is determined, the heating time is integrally shortened in the limited operation time of the rotary kiln, the heat preservation time is better held in the heating process, and the stable temperature rise is not reduced; therefore, the drying, dehydration, mineral substance decomposition and combination of the refractory material of the rotary kiln system can be ensured, the moisture of the system can be ensured to be slowly evaporated by high-temperature hot gas, and the occurrence of moisture adhesion and blockage brought into the dust collection of the kiln tail bag by a tail exhaust fan is avoided.
3. According to the invention, equipment adjustment is carried out before ignition, so that the air draft of the system can be reduced; the materials are optimized during ignition, so that the coal powder can be fully combusted; the equipment operation is carried out after ignition, so that the sufficient combustion of the coal powder can be further ensured, black smoke and dust can not be generated when the coal powder is sufficiently combusted, and the condition that the ignition chimney smokes to pollute the environment is avoided.
Drawings
FIG. 1 is a schematic view of the whole cement manufacturing apparatus of the present invention;
in the figure, 1-kiln head exhaust fan, 2-primary fan, 3-multichannel burner, 4-ignition chimney, 5-circulating fan, 6-raw material mill system cold air valve, 7-tail bag dust collection cold air valve and 8-kiln tail exhaust fan.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments.
A pollution-free ignition temperature rise operation method for a rotary kiln comprises the steps of establishing a temperature rise curve, adjusting equipment before ignition and operating the equipment after ignition.
The specific steps of the above operation are as follows, wherein the production equipment involved is as shown in FIG. 1.
Aiming at the formulation of the heating curve, the heating curve is formulated according to the overhaul condition of the rotary kiln and the environmental temperature, so that the heating time is ensured, and the stable temperature rise is not reduced.
Particularly, the replacement of refractory bricks in the rotary kiln is less than or equal to 1/3, the replacement of refractory materials in a preheater is less than or equal to 1/5, and the temperature is increased to ensure that the temperature is more than 16 hours; the refractory brick is replaced by less than or equal to 2/3, the refractory material of the preheater is replaced by less than or equal to 2/5, and the temperature is raised for more than 24 hours; the refractory bricks are replaced in the whole kiln, the refractory material of the preheater is replaced by less than or equal to 3/5, and the temperature rise is ensured to be more than 32 hours.
The operation time of the rotary kiln is limited, and the temperature rise curve is formulated, so that the temperature rise time is integrally shortened, the heat preservation time is well held in the temperature rise process, and the stable temperature rise is not reduced; therefore, the drying, dehydration, mineral substance decomposition and combination of the refractory material of the rotary kiln system can be ensured, the moisture of the system can be ensured to be slowly evaporated by high-temperature hot gas, and the phenomenon that the moisture brought into the dust collection of the kiln tail bag by a tail exhaust fan is adhered and blocked by dust is avoided.
Aiming at equipment adjustment before ignition and aiming at reducing system draught, the specific operation mode is one, and the starting frequency of a kiln tail exhaust fan 8 is reduced; and in the second mode, the kiln tail bag dust collection cold air valve 7 is opened, and in the third mode, the opening proportion of the ignition chimney 4 is reduced.
In a preferred mode of the first mode, the starting frequency of the kiln tail exhaust fan 8 is reduced from the original 10Hz to 5Hz, wherein the opening degree of the valve plate is closed to 10% from the original 100% so as to reduce the air pulling quantity of the system.
As an alternative mode of the second mode, a rotary kiln with a kiln tail bag dust collection cold air valve 7 is omitted, and the cold air valve 6 of a raw material mill system can be opened for adjustment.
As a preferred mode of the third mode, the valve plate of the ignition chimney 4 is opened by 50% or 30% to reduce the influence of large wind pulling of the kiln tail exhaust fan 8 on the incomplete combustion of the pulverized coal at low temperature and the taking away of the pulverized coal, so that the negative pressure at the valve of the chimney is ensured to exist all the time; the device can be used for on-site watching or camera monitoring, so that no smoke is emitted.
The ignition operation is carried out through a multi-channel combustor 3, the multi-channel combustor 3 automatically conveys pulverized coal, air and diesel oil required by ignition, wherein the pulverized coal preparation quality is that the fineness of the pulverized coal is less than or equal to 4.0 percent, the water content is less than or equal to 2.0 percent, the heat productivity is more than or equal to 5800 kcal/kg, the volatile matter is more than or equal to 25 percent, and the ash content is less than or equal to 20 percent, so that the burnout degree of the pulverized coal at low temperature is ensured; the diesel oil combustion-supporting dosage is increased by 20 percent to ensure the complete combustion of the pulverized coal, and avoid the phenomena that the pulverized coal is formed near a cold wall, oxygen-deficient incomplete combustion is caused, coal ash is partially and seriously accumulated, coking is formed when feeding is carried out at high temperature, and material blockage occurs.
Aiming at the equipment operation after ignition and aiming at further ensuring the sufficient combustion of the coal powder, the specific operation comprises the following steps:
step one, after diesel oil is ignited, the kiln drying time of the diesel oil is prolonged, and when the temperature of a smoke chamber rises to 200 ℃, pulverized coal is carried to burn so as to avoid incomplete combustion of the pulverized coal caused by low temperature in a rotary kiln.
And step two, the kiln head exhaust fan 1 is started in advance, when the temperature of the kiln tail smoke chamber rises to be more than or equal to 600 ℃, the kiln head exhaust fan 1 is started along with the increase of the coal fed by the kiln head so as to ensure that the coal powder is fully combusted in front of the kiln and reduce the post combustion phenomenon of the coal powder.
Step three, after the kiln head exhaust fan 1 is started in advance, the air quantity of the primary fan 2 and the air quantity of the kiln head coal conveying are increased; so that sufficient air quantity is supplied for burning the pulverized coal, and the burnout rate of the pulverized coal is improved.
Preferably, the air volume of the primary fan 2 is increased from 35Hz to 40Hz, and the air volume of the coal fed to the kiln head is increased from 25Hz to 28 Hz.
In the operation of the equipment after ignition, the pulverized coal gradually reaches complete combustion under the condition of meeting the temperature along with the rise of the temperature in the kiln, and the valve plate of the ignition chimney 4 needs to be slowly closed in the process until the temperature is completely closed to 0 percent.
In the actual operation process, the whole process of ignition and temperature rise of the rotary kiln is pollution-free, and the phenomenon of black smoke emission is avoided; the working condition of the kiln tail bag dust collector is not influenced, and the blocking phenomenon that the filter bag is not ventilated smoothly due to the fact that water is attached to the filter bag and is not easy to fall off is avoided; the phenomenon of coke blockage is avoided, and the rotary kiln feeding process is safely completed.
Claims (7)
1. A pollution-free ignition heating operation method of a rotary kiln is characterized by comprising the steps of establishing a heating curve to ensure the heating time, and only raising the stable temperature and reducing the stable temperature accurately; adjusting equipment before ignition to reduce system draught; and the equipment after ignition is operated to adjust the air quantity to ensure the full combustion of the pulverized coal.
2. The operating method of pollution-free ignition temperature rise of the rotary kiln as claimed in claim 1, wherein the temperature rise curve is formulated according to the overhaul condition of the rotary kiln and the environmental temperature, specifically, the refractory brick in the rotary kiln is replaced by not more than 1/3, the temperature rise of the preheater by replacing refractory materials is not more than 1/5, and the temperature rise is ensured to be more than 16 hours; the refractory brick is replaced by less than or equal to 2/3, the refractory material of the preheater is replaced by less than or equal to 2/5, and the temperature is raised for more than 24 hours; the refractory bricks are replaced in the whole kiln, the refractory material of the preheater is replaced by less than or equal to 3/5, and the temperature rise is ensured to be more than 32 hours.
3. The operating method of pollution-free ignition temperature rise of the rotary kiln as claimed in claim 1, wherein the equipment adjustment before ignition comprises a first mode of reducing the starting frequency of a kiln tail exhaust fan; and in the second mode, the kiln tail bag dust collection cold air valve is opened, and in the third mode, the opening proportion of the ignition chimney valve is reduced.
4. The method as claimed in claim 3, wherein the starting frequency of the kiln tail exhaust fan is reduced from 10Hz to 5Hz, and the valve plate is closed to 10% from 100%.
5. The method as claimed in claim 3, wherein the operation of the rotary kiln is adjusted by using a cold air valve of a raw material mill system instead of the second mode.
6. The operating method of the rotary kiln pollution-free ignition temperature rise according to the claim 3, wherein the third mode is that the valve plate of the ignition chimney is opened by 50% or 30%, so that negative pressure always exists at the valve of the ignition chimney, and the ignition chimney does not smoke when being observed on site or monitored by camera shooting.
7. The operation method of pollution-free ignition temperature rise of the rotary kiln according to any one of claims 4 to 6, wherein the operation of the equipment after ignition comprises the following specific operations:
step one, after diesel oil is ignited, prolonging the kiln drying time of the diesel oil until the temperature of a smoke chamber rises to 200 ℃, and then burning with pulverized coal;
step two, the kiln head exhaust fan is started in advance, and when the temperature of the kiln tail smoke chamber rises to be more than or equal to 600 ℃, the kiln head exhaust fan is started along with the increase of the coal supply amount of the kiln head;
step three, increasing the air volume of a primary fan and the air volume of the kiln head coal feeding after a kiln head exhaust fan is started in advance;
in this process, the valve plate of the ignition chimney is gradually closed, and finally, the ignition chimney is completely closed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110968066.XA CN113654345A (en) | 2021-08-23 | 2021-08-23 | Operation method for pollution-free ignition temperature rise of rotary kiln |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110968066.XA CN113654345A (en) | 2021-08-23 | 2021-08-23 | Operation method for pollution-free ignition temperature rise of rotary kiln |
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| CN113654345A true CN113654345A (en) | 2021-11-16 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4259081A (en) * | 1977-04-30 | 1981-03-31 | Metallgesellschaft Aktiengesellschaft | Process of calcining limestone in a rotary kiln |
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| CN101423347A (en) * | 2008-11-11 | 2009-05-06 | 万长均 | Ignition warming up method of cement dry method rotary kiln |
| CN202630710U (en) * | 2012-03-28 | 2012-12-26 | 曲大伟 | Plasma baking furnace and ignition temperature automatic control system for rotary kiln |
| CN104315841A (en) * | 2014-10-24 | 2015-01-28 | 湖南创元新材料有限公司 | Rotary kiln starting method |
| CN106839778A (en) * | 2017-01-14 | 2017-06-13 | 安徽芜湖海螺建筑安装工程有限责任公司 | Castable preliminary drying roasting method and application apparatus in a kind of cement rotary kiln |
| CN109612268A (en) * | 2018-11-30 | 2019-04-12 | 湖南嘉力亚新材料有限公司 | A kind of rotary kiln energy conservation starting method |
-
2021
- 2021-08-23 CN CN202110968066.XA patent/CN113654345A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4259081A (en) * | 1977-04-30 | 1981-03-31 | Metallgesellschaft Aktiengesellschaft | Process of calcining limestone in a rotary kiln |
| CN1033871A (en) * | 1988-07-13 | 1989-07-12 | 武汉工业大学 | Outer decomposing furnace of cement kiln ignition method and device |
| CN101423347A (en) * | 2008-11-11 | 2009-05-06 | 万长均 | Ignition warming up method of cement dry method rotary kiln |
| CN202630710U (en) * | 2012-03-28 | 2012-12-26 | 曲大伟 | Plasma baking furnace and ignition temperature automatic control system for rotary kiln |
| CN104315841A (en) * | 2014-10-24 | 2015-01-28 | 湖南创元新材料有限公司 | Rotary kiln starting method |
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| CN109612268A (en) * | 2018-11-30 | 2019-04-12 | 湖南嘉力亚新材料有限公司 | A kind of rotary kiln energy conservation starting method |
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Application publication date: 20211116 |