CN106833708B - Method for guiding coal blending of specific kiln in cement industry - Google Patents
Method for guiding coal blending of specific kiln in cement industry Download PDFInfo
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- CN106833708B CN106833708B CN201710186326.1A CN201710186326A CN106833708B CN 106833708 B CN106833708 B CN 106833708B CN 201710186326 A CN201710186326 A CN 201710186326A CN 106833708 B CN106833708 B CN 106833708B
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
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Abstract
The invention discloses a method for guiding coal blending of a specific kiln in cement industry, which comprises the following steps: preparing multiple batches of coal, and detecting effective combustion time and heat release intensity of two characteristic parameters of each batch of coal outside the furnace; after each batch of coal is fed into the furnace for combustion production, calculating the standard coal consumption of each batch of coal relative to the unit cement clinker; the standard coal consumption and the two characteristic parameters of each batch of coal are analyzed by a data analysis program, the relation between different standard coal consumption and the two characteristic parameters of the coal used in a specific cement production line and a specific kiln is established, and finally the standard coal consumption of the coal can be selected and controlled outside the kiln by adjusting the two characteristic parameters. The invention provides the burning intensity and the effective burning time as characteristic parameters for evaluating the burning characteristics of coal, and can find the specific range of the coal characteristic indexes applicable to various cement industrial kilns by measuring the parameters, thereby providing the control requirement for the matching use of the coal in the production.
Description
Technical Field
The invention belongs to the field of cement industry, and particularly relates to a method for guiding coal blending of a specific kiln in the cement industry.
Background
In the production process of the novel cement, the pulverized coal in the decomposing furnace is combusted to release heat, the carbonate absorbs heat to decompose, and the combustion condition of the pulverized coal influences the heating capacity of the decomposing furnace and the clinker yield of the cement kiln.
Nowadays, energy is increasingly tense, coal resources are increasingly scarce, high-grade coal is nearly exhausted, low-grade coal is applied to the cement industry more and more widely, coal types are frequently replaced and different coal types are matched, so that a plurality of problems are brought to production operation, such as decomposition of in-furnace crust blockage, high coal consumption, low clinker yield and the like.
The solution of these problems depends first on the recognition and evaluation of the combustion characteristics of coal, and it is highly desirable to establish an evaluation method by which a suitable coal type can be found for different cement production lines.
The combustion behavior of coal in the cement industry is complex and traditional industrial analysis is not applicable. In China, many colleges and scientific research institutions research the combustion characteristics of coal, and various evaluation indexes and evaluation systems of the coal cannot visually describe the combustion quality of the coal and cannot provide targeted applicable coal types according to the difference of cement production lines.
Coal accounts for 50-60% of cement production cost, coal types suitable for a certain cement production line are selected, theoretical guidance can be provided for different coal types suitable for the cement industry, the utilization rate of the coal is improved, the production cost is reduced, and CO is reduced2Discharge, stabilize the production line and improve the product quality.
The largest user of coal is thermal power, so that coal combustion characteristic indexes (flammability, combustion temperature, combustion dispersity, burnout time and comprehensive combustion characteristic indexes) are basically developed around the requirements of a boiler fluidized bed and the like and are not suitable for the requirements of a cement industrial kiln; in terms of purchasing and using coal, each cement enterprise has no clear coal characteristic index as a basis.
Various cement industry research institutions propose comprehensive combustion characteristic index S values, have ambiguous physical meanings and are not related to actual coal combustion behaviors in cement industrial kilns; the requirement of enterprises for defining the type and characteristics of coal suitable for cement industrial kilns is not met, and no mention is made of quantitative coal char characteristic indexes for guiding the purchase and application of coal.
Disclosure of Invention
In order to solve the dilemma that the existing coal evaluation method can not correctly and intuitively describe the combustion characteristics of coal and can not provide theoretical guidance for different coal types in the cement industrial production, the invention aims to utilize two combustion characteristic parameters of coal: effective combustion time and heat release intensity (also called combustion intensity in the patent), and establishes a method for guiding coal blending of a specific kiln, thereby providing theoretical guidance for coal used in cement industry.
The purpose of the invention is realized by the following technical scheme:
the method for guiding the coal blending of a specific kiln in the cement industry comprises the following steps:
(1) preparing multiple batches of coal for a specific cement production line and a specific kiln;
(2) outside the furnace, detectingTwo characteristic parameters of the coal used in each batch, namely the effective combustion time (T)s) And exothermic severity (I);
(3) after each batch of coal is fed into the furnace for combustion production, calculating the standard coal consumption of each batch of coal relative to the unit cement clinker;
(4) the standard coal consumption and the two characteristic parameters of each batch of coal are analyzed by a data analysis program, the relation between different standard coal consumption and the two characteristic parameters of the coal used in a specific cement production line and a specific kiln is established, and finally the standard coal consumption of the coal can be selected and controlled outside the kiln by adjusting the two characteristic parameters.
The number of batches in step (1) is preferably 20 or more.
The cement production line is a cement production line consisting of a series of equipment for producing cement, and is mainly formed from the processes of crushing, prehomogenizing, raw material preparation homogenizing, preheating decomposition, cement clinker firing and cement grinding and packaging, etc. said invention is applicable to new-type dry kiln system, its specification is (5000t/d), and includes three-grade rotary kiln whose specification is 4.8x72 m-4.8 x74m and decomposing furnace whose specification is 7.5 × 30 m-7.6 × 32m (including goose neck tube furnace volume is about 2100m3Left and right), single or double row preheaters.
In step (2), the effective combustion time (T)s) The time from the start of the stable combustion temperature to the time when the combustible components lose weight by 98 percent is counted; the stable combustion temperature refers to the temperature at which the pulverized coal starts to stably combust, namely the weight of the sample is calculated from the observation of the continuous weight loss of the sample, and the temperature when the weight loss of the sample reaches 10 percent and is close to the maximum weight loss rate represents the stable combustion temperature and can be obtained by measuring the temperature of a hearth.
The heat release intensity (I) refers to the intensity of instantaneous heat release in the heat release process of the pulverized coal, and is calculated by 1/2 of the maximum heat release value and the obvious heat release time of a sample under standard experimental conditions; i is H/W0.5(ii) a H: the highest value of differential thermal curve measured by instrument, DSC peak height (mW/mg); w0.5: start and stop time of 1/2 position of exothermic peak of differential thermal curve, DSC half-peak width (min).
In the step (2), the detecting two characteristic parameters of each batch of coal comprises the following steps:
taking coal powder, grinding the coal powder until the fineness is less than 125 mu m, drying the coal powder for more than 4 hours at the temperature of 45 ℃, and controlling the water content to be between 1 and 2.5 percent; weighing 10-15 mg of sample, detecting by using a relaxation-resistant synchronous thermal analyzer, wherein the reaction atmosphere comprises 30ml/min of air as a flame retardant gas, 10ml/min of nitrogen as a purge gas, and heating from room temperature to 1000 ℃ at a heating rate of 10K/min; performing thermogravimetric detection according to the testing steps of the relaxation-resistant synchronous thermal analyzer, and performing data analysis and calculation by using relaxation-resistant synchronous analysis software to obtain the two characteristic parameters;
the data analysis program in the step (4) is preferably Python or Minitab.
The production process of the modern cement kiln comprises the following steps: the coal powder is sprayed into a horizontally rotating cylinder (commonly called a cement kiln) from the front end (commonly called a kiln head) along with hot air, reaches a certain temperature area like a water column, and then is combusted to form long flame. The prepared cement clinker raw material (powder) is fed from the rear end (commonly called kiln tail), and is matched with the barrel to continuously rotate and gradually move forwards; close to the surface of the flame (but not in contact with the surface of the flame to ensure the combustion of the pulverized coal), obtain enough heat and enough time to complete the combination reaction, and finally fall into a cooling machine from the kiln head to be cooled into cement clinker.
The reason for selecting the effective combustion time as the coal combustion characteristic parameter is as follows: the raw materials entering from the tail of the kiln are required to complete two-step reaction, namely, the dicalcium silicate and other intermediates are generated at the temperature of 1000-1300 ℃, and the tricalcium silicate is reacted at the temperature of 1350-1500 ℃ in the other stage. The pulverized coal is effectively combusted to transfer heat required for chemical reactions to the raw materials. Effective burning time is unfavorable for completion, the quality of chemical reaction and then influence the stability of operation that the effective burning time is too short, and the tail end of barrel is then burnt in the overlength, not only extravagant energy but also leads to equipment trouble.
The reason for choosing the combustion intensity is: the heat release capacities of pulverized coals from different sources are greatly different after combustion, and the proper heat release capacity can ensure that flames formed by the combustion of the pulverized coals quickly reach the proper temperature; lower exothermic intensity can make it difficult to reach the optimum temperature for the chemical reaction of the raw materials in the highest temperature section of the flame, but too high exothermic capacity can cause the flame to have too high a temperature, which can not only waste energy but also damage the production facility.
Compared with the prior art, the invention has the following advantages and effects:
the invention provides the burning intensity and the effective burning time as characteristic parameters for evaluating the coal burning characteristics; one is to explain the function of coal combustion factors in cement industrial kilns in abnormal conditions such as overlong black fire head, overhigh temperature of a kiln tail smoke chamber, long thick kiln skin and reduction atmosphere caused by the falling of unburned coal ash into products; secondly, the combustion characteristic values of the same coal producing areas are basically similar, and clear indication indexes are provided for purchasing coal; thirdly, the parameter can be measured to find the specific applicable coal characteristic index range of various cement industrial kilns, and the control requirement is provided for the matching use of the coal in the production.
Drawings
FIG. 1 is a graph of the normalized coal consumption of each batch of coal used in a particular kiln as a function of two characteristic parameters.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Examples
The method for guiding the coal blending of a specific kiln in the cement industry comprises the following steps:
(1) the Huarun cement (Shangsi) company is located in the Si Yan town of Si county, Fangcheng, City, Yongxi, autonomous region of Guangxi Zhuang province, has two clinker production lines with daily production (5000t/d), and prepares multiple batches of coal for the production line and the kiln of the company;
(2) outside the furnace, two characteristic parameters of each batch of coal are detected, and the effective combustion time (T)s) And exothermic severity (I); the results are shown in Table 1;
(3) after each batch of coal is fed into the furnace for combustion production, calculating the standard coal consumption of each batch of coal relative to the unit cement clinker; the results are shown in Table 1;
the coal consumption of the batch 1 in Table 1 was taken as an example to calculate the standard coal consumption:
the standard coal consumption (kg coal/t clinker) is the total amount of coal fed into the kiln per batch (ton) x (calorific value of the coal (Kcal/kg)/7000 Kcal)/the total amount of clinker produced from the coal (ton) x 1000
5014(t coal) x (5692(Kcal/kg)/7000)/38439(t clinker) x 1000
106.06kg coal/t clinker
(4) The nominal coal consumption and the two characteristic parameters of each batch of coal are analyzed by using a data analysis program Mintab, and the relationship between different nominal coal consumption and the two characteristic parameters for the coal used in a specific cement production line and a specific kiln is established, as shown in figure 1.
It can be seen that:
A. the optimal standard coal consumption is less than 103, the heat release intensity is approximately 1.20-1.32, and the effective combustion time is approximately 16.0-18.1.
B. The sub-optimal standard coal consumption is 103-105, and the effective combustion time is approximately below 18.5.
C. The coal consumption is higher by 105-107, and the effective combustion time is approximately more than 18.6.
D. The coal consumption is higher than 107-110, the heat release intensity is approximately 0.87-1.12, and the effective combustion time is approximately 19.8-22.0.
Through the above relationship, the standard coal consumption of the coal used in the specific kiln can be selected and controlled outside the kiln through the adjustment of the two characteristic parameters.
TABLE 1
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (3)
1. The method for guiding the coal blending of a specific kiln in the cement industry is characterized by comprising the following steps of:
(1) preparing multiple batches of coal for a specific cement production line and a specific kiln;
(2) detecting two characteristic parameters of coal used in each batch outside the furnace, namely effective combustion time and heat release intensity;
(3) after each batch of coal is fed into the furnace for combustion production, calculating the standard coal consumption of each batch of coal relative to the unit cement clinker;
standard coal consumption (kg coal/t clinker) = total amount of coal fed into kiln per batch (ton) × (calorific value of the coal (Kcal/kg)/7000 Kcal)/total amount of clinker produced from the coal (ton) × 1000;
(4) analyzing the standard coal consumption and the two characteristic parameters of each batch of coal by using a data analysis program, establishing a relation between different standard coal consumption and the two characteristic parameters aiming at the coal used in a specific cement production line and a specific kiln, and finally selecting and controlling the standard coal consumption of the coal by adjusting the two characteristic parameters outside the furnace;
in the step (2), the detecting two characteristic parameters of each batch of coal comprises the following steps:
taking coal powder, grinding the coal powder until the fineness is less than 125 mu m, drying the coal powder for more than 4 hours at the temperature of 45 ℃, and controlling the water content to be between 1 and 2.5 percent; weighing 10-15 mg of sample, detecting by using a relaxation-resistant synchronous thermal analyzer, wherein the reaction atmosphere comprises 30ml/min of air as a flame retardant gas, 10ml/min of nitrogen as a purge gas, and heating from room temperature to 1000 ℃ at a heating rate of 10K/min; performing thermogravimetric detection according to the testing steps of the relaxation-resistant synchronous thermal analyzer, and performing data analysis and calculation by using relaxation-resistant synchronous analysis software to obtain the two characteristic parameters;
in the step (2), the effective combustion time refers to the time from the beginning of timing the stable combustion temperature of the pulverized coal to the time when the combustible components lose weight by 98%;
the stable combustion temperature refers to the temperature at which the pulverized coal starts to stably combust, namely the weight of the sample is calculated from the start of observing the continuous weight loss of the sample, and the temperature when the weight loss of the sample reaches 10 percent and is close to the maximum weight loss rate represents the stable combustion temperature;
the data analysis program in the step (4) is Python or Minitab.
2. The method of claim 1, wherein: the cement production line in the step (1) is a novel dry kiln system.
3. The method of claim 1, wherein: the number of the batches in the step (1) is more than 20.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103214199A (en) * | 2012-12-15 | 2013-07-24 | 昆明钢铁控股有限公司 | Method for calcining novel dry-method cement clinker by brown coal |
| CN106007425A (en) * | 2016-05-23 | 2016-10-12 | 临沂中联水泥有限公司 | Method for producing cement clinker by adopting matching of high and low volatile bituminous coal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103214199A (en) * | 2012-12-15 | 2013-07-24 | 昆明钢铁控股有限公司 | Method for calcining novel dry-method cement clinker by brown coal |
| CN106007425A (en) * | 2016-05-23 | 2016-10-12 | 临沂中联水泥有限公司 | Method for producing cement clinker by adopting matching of high and low volatile bituminous coal |
Non-Patent Citations (1)
| Title |
|---|
| "水泥工业中煤的燃烧特性评价方法";刘瑞芝等;《水泥技术》;20080703(第3期);第18-21页 * |
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