CN114819594A - Efficiency evaluation method for sludge dewatering process - Google Patents
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Abstract
The invention discloses a sludge dewatering process efficiency evaluation method, which comprises the following steps: selecting an evaluation factor capable of reflecting the efficiency of the sludge dewatering process; determining a reference value of the evaluation factor; detecting actual measurement values of evaluation factors of sludge dewatering, and calculating to obtain standardized values of the evaluation factors through a standardized formula; obtaining a standardized matrix according to the standardized numerical values; calculating the weight of the standardized numerical value, calculating the entropy value and the difference coefficient of the evaluation factor, and obtaining the weight of each evaluation factor according to the difference coefficient; and determining the influence factor sequence of the sludge dewatering process according to the magnitude sequence of the weight of each evaluation factor. The efficiency evaluation method for the sludge dewatering process provided by the invention solves the problem that the evaluation result is not credible due to subjective influence in the existing sludge dewatering process, and provides a reference basis for improving the sludge dewatering performance.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a method for evaluating efficiency of a sludge dewatering process.
Background
With the continuous improvement of urbanization level, the sewage treatment capacity is further enhanced, and a sewage plant generates a large amount of excess sludge while running, thereby bringing huge pressure to the environment. The residual sludge treatment/disposal modes include landfill and incineration, but are limited to limited landfill space, blocked land utilization and secondary environmental pollution, and the landfill mode is not applicable any more; the incineration treatment of the excess sludge can realize harmless treatment and reduction treatment, but the sludge has high water content, dehydration treatment is required before the incineration treatment, and at the present stage, the sludge dehydration process has the defects of high water content, high energy consumption and the like, and an effective process evaluation system does not exist. A set of sludge dewatering process efficiency evaluation system is established, so that decision can be assisted, the improvement of the overall level of the industry is promoted, and the environment-friendly society is favorably built.
Disclosure of Invention
The invention aims to provide a sludge dewatering process efficiency evaluation method in order to solve the problem that the prior art cannot effectively evaluate the influence factors of sludge dewatering.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a sludge dewatering process efficiency evaluation method comprises the following steps:
(1) selecting an evaluation factor capable of reflecting the efficiency of the sludge dewatering process; determining a reference value of the evaluation factor;
(2) detecting actual measurement values of evaluation factors of sludge dewatering, and calculating to obtain standardized values of the evaluation factors through a standardized formula; obtaining a standardized matrix according to the standardized numerical values;
the method comprises the steps of standardizing a batch of behavior actual measurement data of a matrix, wherein columns of the standardized matrix are evaluation factors;
(3) calculating the weight of the standardized numerical value, calculating the entropy value and the difference coefficient of the evaluation factor, and obtaining the weight of each evaluation factor according to the difference coefficient; determining the sequencing of the influence factors of the sludge dewatering process efficiency according to the sequencing of the weight of each evaluation factor;
in the step (1), the evaluation factors comprise four criteria layers of mechanical performance, treatment effect, cost and energy consumption and environment evaluation.
Preferably, according to the efficiency evaluation method of the sludge dewatering process, the sludge dewatering process is divided into a common dewatering process, a medium-dryness dewatering process and a high-dryness dewatering process according to the final water content of the sludge; the final water content of the sludge in the common dehydration process is more than 75 percent; the final water content of the sludge of the medium dryness dehydration process is 55-75 percent; the final water content of the sludge of the high-dryness dehydration process is less than 55 percent.
Preferably, the mechanical performance of the sludge dewatering process efficiency evaluation method comprises five indexes of equipment stability, equipment operation difficulty, equipment cleaning period, equipment safety and equipment floor area.
Preferably, the efficiency evaluation method of the sludge dewatering process has the treatment effects of three indexes of water content, heat value and dioxin formation amount by combustion.
Preferably, the cost and energy consumption of the sludge dewatering process efficiency evaluation method comprise six indexes of energy consumption, water consumption, manual consumption, equipment investment intensity, building investment intensity and operation cost.
Preferably, the efficiency evaluation method of the sludge dewatering process comprises three indexes of sewage production, exhaust emission and noise level; one skilled in the art can select an appropriate evaluation factor based on the actual process run.
Preferably, in the method for evaluating the efficiency of the sludge dewatering process, the calculation mode of each evaluation factor is as follows:
equipment stability: the unit is as follows, calculated by failure days per hundred days: day;
ease of operation of the apparatus: the unit is measured by average teaching time length: day;
equipment cleaning cycle: the cleaning frequency is measured, and the unit of the interval time of cleaning once is as follows: day/time;
equipment safety: after the judgment by the risk level matrix, the risk level is determined by the loss level and the time occurrence probability level, which is specifically shown in the following table 1:
TABLE 1 Risk class determination Table
Note: and quantifying the risk levels I, II, III and IV to obtain values 1, 2, 3 and 4 respectively for calculation.
The floor area of the equipment is as follows: the ratio of the occupied area to the daily treatment capacity is represented by the following unit: m is 2 /(t/d)；
Water content: the unit is: percent;
heat value: the heat value generated after 1kg of dewatered sludge is combusted is represented by the following unit: kj/kg;
amount of dioxin formed by combustion: the unit is as follows, wherein 1kg of dewatered sludge generates dioxin after combustion: mg/kg;
energy consumption: the unit is measured by 1t of dehydrated sludge consumption standard coal amount: t standard coal/t dewatered sludge;
water consumption: the unit is as follows based on the 1t dewatered sludge consumption water amount: t water/t dewatered sludge;
manual consumption: the unit is as follows according to the working day of 1 ton of absolutely dry sludge consumption: drying the sludge by the aid of work days/t;
the equipment investment intensity is as follows: measured in ten thousand yuan RMB/(t absolute dry sludge/day);
building investment intensity: measured in ten thousand yuan RMB/(t absolute dry sludge/day);
the operation cost is as follows: counting by ten-thousand yuan RMB/day;
sewage generation amount: measured as t sewage/t dewatered sludge;
exhaust emission: in m 3 A/t dehydrated sludge meter;
noise level: in a day-night average effective sound level meter, the unit is: dB;
preferably, in the method for evaluating the efficiency of the sludge dewatering process, the reference values of the evaluation factors are as follows:
equipment stability: the number of failure days per hundred days is 0.5 day;
ease of operation of the apparatus: on the basis of average teaching time length, the common dehydration process is 7 days, the medium-dryness dehydration process is 10 days, and the high-dryness dehydration process is 15 days;
equipment cleaning cycle: according to the cleaning frequency, the common dehydration process is once for 30 days, the medium-dryness dehydration process is once for 25 days, and the high-dryness dehydration process is once for 20 days;
equipment safety: the risk rating is specified as class I:
the floor area of the equipment is as follows: the common dehydration process is 0.3 by the ratio of the occupied area to the daily treatment capacitym 2 /(t/d), the medium dryness dehydration process is 0.5m 2 /(t/d), high dryness dehydration Process 0.8m 2 /(t/d)；
Water content: the common dehydration process is 80 percent, the medium dryness dehydration process is 60 percent, and the high dryness dehydration process is 50 percent;
heat value: based on the calorific value generated after 1kg of dewatered sludge is combusted, the common dewatering process is 4300kj/kg, the medium-dryness dewatering process is 4500kj/kg, and the high-dryness dewatering process is 4800 kj/kg;
amount of dioxin formed by combustion: 2mg/kg of dioxin produced after 1kg of dehydrated sludge is combusted;
energy consumption: based on the consumption of standard coal by 1t of dehydrated sludge, the high-degree dehydration process is 0.8t of standard coal/t of dehydrated sludge, the medium-dryness dehydration process is 0.7t of standard coal/t of dehydrated sludge, and the common dehydrated sludge is 0.65t of standard coal/dehydrated sludge;
water consumption: the water consumption of 1t of dehydrated sludge is 0.3t of water/t of dehydrated sludge;
manual consumption: taking the working day/t of the oven-dried sludge as 10 working days/t of the oven-dried sludge;
the equipment investment intensity is as follows: calculated as the Ten thousand yuan RMB/(t absolute dry sludge/day), is 0.03;
building investment intensity: calculated as the Ten thousand yuan RMB/(t absolute dry sludge/day), is 0.042;
the operation cost is as follows: calculated by the Ten thousand yuan RMB/day, is 0.02;
sewage generation amount: 1.2 in terms of t sewage/t dewatered sludge;
exhaust emission: in m 3 The dehydrated sludge is counted by 30;
noise level: the average effective sound level meter of day and night is 60 dB; the reference value of the evaluation factor can be adjusted appropriately by the person skilled in the art according to the actual process run.
Preferably, in the method for evaluating the efficiency of the sludge dewatering process, in the step (2), the standardized formula is as follows: c b ＝C/C h (ii) a In the formula C b As a normalized value, C is an actual measurement value of an evaluation factor before normalization, C h Is a reference value of the evaluation factor.
Preferably, in the method for evaluating the efficiency of the sludge dewatering process, in the step (3), the calculation formula of the weight of the standardized value is as follows:
in the formula: a is ij 1 is the normalized matrix element in step (1); a is ij 2 is the weight of the normalized value.
Preferably, in the method for evaluating efficiency of sludge dewatering process, in the step (3), the formula for calculating entropy of evaluation factor is as follows:
in the formula: entropy value j Entropy value of the j-th column evaluation factor; a is ij 2 is the weight of the normalized value.
Preferably, in the method for evaluating the efficiency of the sludge dewatering process, in the step (3), the calculation formula of the difference coefficient is as follows:
coefficient of difference j 1-entropy j 。
Preferably, in the method for evaluating efficiency of sludge dewatering process, in the step (3), the calculation formula of the weight of the evaluation factor is as follows:
after the weight of each index is calculated according to a formula, the weight of each index to the system is obtained, wherein the larger the weight value represents the larger the influence of the index on the system efficiency is, and the smaller the influence of the index on the system efficiency is, otherwise, the smaller the weight value is.
The beneficial effects of the invention are:
the invention provides a sludge dewatering process efficiency evaluation method which is simple, accurate in result and high in efficiency, an improved entropy method is used, an evaluation result can be obtained through simple standardization and average value operation, the problem that the evaluation result is not credible due to subjective influence in existing sludge dewatering is solved, and a reference basis is provided for improving the sludge dewatering performance.
Detailed Description
The present invention will be described in further detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1
The embodiment relates to an efficiency evaluation system of a common sludge dewatering process, which specifically comprises the following steps:
s1, establishing an efficiency model of the sludge dewatering process by integrating a theoretical analysis method and an expert scoring method according to the current research situation and the current industrial development situation of the current field;
s2, establishing a criterion layer of a sludge dewatering process efficiency evaluation system according to the sludge dewatering process efficiency model in the S1;
s3, establishing an index layer of the sludge dewatering process efficiency evaluation system according to the criterion layer of the sludge dewatering process efficiency evaluation system in the S2 and the efficiency model of the sludge dewatering process in the S1, namely determining an evaluation factor;
s4, constructing a sludge drying process efficiency evaluation system according to the criterion layer and the index layer in the S2 and the S3, and calculating the weight of each layer through a formula.
The criteria layers of S2 are:
mechanical properties: refers to the relative performance of the mechanical equipment involved in the overall process run.
The treatment effect is as follows: the final effect that each index of the whole process can achieve is indicated.
Cost and energy consumption: refers to the economic expenditure and energy consumption generated in the whole process operation process.
And (3) environmental evaluation: refers to the pollution emission index generated in the whole process operation process.
The index layer of S3 has a total of 17 evaluation factors, of which: the method has the advantages of 5 mechanical properties (equipment stability, equipment operation difficulty, equipment cleaning period, equipment safety and equipment floor area), 3 treatment effects (water content, heat value and dioxin amount formed by combustion), 6 cost and energy consumption (energy consumption, water consumption, manual consumption, equipment investment intensity, building investment intensity and running cost (including medicament and maintenance cost)), and 3 environmental evaluations (sewage generation amount, waste gas emission amount and noise level). The 17 indexes are numbered 1-17 respectively, and seven batches of data A-G are collected to complete the establishment of an original data matrix, as shown in the following table 2:
table 2 evaluation factor measured values of example 1
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | |
| A | 0.13 | 2 | 27 | 1 | 0.3 | 0.68 | 1100 | 1.09 | 0.63 | 0.29 | 11 | 0.032 | 0.041 | 0.022 | 1.2 | 28 | 61 |
| B | 0.57 | 7 | 34 | 1 | 0.32 | 0.63 | 2113 | 2.02 | 0.59 | 0.28 | 9 | 0.028 | 0.042 | 0.015 | 1.24 | 29 | 57 |
| C | 0.49 | 7.9 | 29 | 2 | 0.36 | 0.67 | 4300 | 1.93 | 1.56 | 0.31 | 12 | 0.029 | 0.045 | 0.024 | 1.23 | 32 | 60 |
| D | 1 | 7.1 | 25 | 1 | 0.29 | 0.5 | 4211 | 2.08 | 0.57 | 0.067 | 11 | 0.031 | 0.043 | 0.023 | 1.22 | 31 | 62 |
| E | 0.46 | 7 | 36 | 1 | 0.35 | 0.78 | 3365 | 2.16 | 0.61 | 0.32 | 9 | 0.031 | 0.041 | 0.015 | 1.07 | 28 | 62 |
| F | 0.2 | 9 | 34 | 2 | 0.33 | 0.8 | 4322 | 1.78 | 0.66 | 0.26 | 12 | 0.031 | 0.041 | 0.019 | 1.13 | 29 | 63 |
| G | 0.94 | 7 | 29 | 1 | 0.27 | 0.76 | 1359 | 2.1 | 0.63 | 0.29 | 11 | 0.029 | 0.04 | 0.19 | 1.19 | 29 | 63 |
The actual values of the evaluation factors in table 2 were normalized by the following normalization formula:
C b ＝C/C h
in the formula C b As a normalized value, C is an actual measurement value of an evaluation factor before normalization, C h Is a reference value of the evaluation factor.
C of reference value of each evaluation factor h The following were used:
equipment stability: the number of failure days per hundred days is defined as 0.5 day;
ease of operation of the apparatus: the common dehydration process is specified to be 7 days in terms of average teaching time;
equipment cleaning cycle: the common dehydration process is specified to be once in 30 days according to the cleaning frequency;
equipment safety: judging by a risk grade determination table;
the floor area of the equipment is as follows: the common dehydration process is specified to be 0.3m by the ratio of the occupied area to the daily treatment capacity 2 /(t/d)；
The water content standard is as follows: the common dehydration process accounts for 80 percent;
heat value: the heat value generated after 1kg of dewatered sludge is combusted is defined as 4300kj/kg by a common dewatering process;
amount of dioxin formed by combustion: the amount of dioxin produced after 1kg of dewatered sludge is combusted is specified to be 2 mg/kg;
energy consumption: the consumption of standard coal by 1t of dehydrated sludge is measured, and the common dehydrated sludge is specified to be 0.65t of standard coal/dehydrated sludge;
water consumption: the water consumption of 1t of dehydrated sludge is measured and is defined as 0.3t of water/t of dehydrated sludge;
manual consumption: the method comprises the following steps of (1) counting by working day/t of oven dry sludge, wherein the regulation is 10 working days/t of oven dry sludge;
the equipment investment intensity is as follows: the stipulation is 0.03 in terms of Ten thousand yuan RMB/(t absolute dry sludge/day);
building investment intensity: the stipulation is 0.042 in terms of Ten thousand yuan RMB/(t absolute dry sludge/day);
the operation cost is as follows: the standard is 0.02 in terms of Ten thousand yuan RMB/day;
sewage generation amount: the specification is 1.2 in terms of t sewage/t dewatered sludge;
exhaust emission: in m 3 A/t dewatered sludge meter, specified as 30;
noise level: the regulation is 60dB in a day-night average effective sound level meter.
The matrix after normalization of the raw data is shown in Table 3 below:
table 3 example 1 normalized matrix data
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | |
| A | 0.26 | 0.29 | 0.90 | 1.00 | 1.00 | 1.04 | 0.26 | 0.55 | 0.97 | 0.97 | 1.10 | 1.07 | 0.98 | 1.10 | 1.00 | 0.93 | 1.02 |
| B | 1.14 | 1.00 | 1.13 | 1.00 | 1.07 | 2.00 | 0.49 | 1.01 | 0.91 | 0.93 | 0.90 | 0.93 | 1.00 | 0.75 | 1.03 | 0.97 | 0.95 |
| C | 0.98 | 1.13 | 0.97 | 2.00 | 1.20 | 0.91 | 1.00 | 0.97 | 2.40 | 1.03 | 1.20 | 0.97 | 1.07 | 1.20 | 1.03 | 1.07 | 1.00 |
| D | 2.00 | 1.01 | 0.83 | 1.00 | 0.97 | 0.63 | 0.98 | 1.04 | 0.88 | 0.22 | 1.10 | 1.03 | 1.02 | 1.15 | 1.02 | 1.03 | 1.03 |
| E | 0.92 | 1.00 | 1.20 | 1.00 | 1.17 | 1.50 | 0.78 | 1.08 | 0.94 | 1.07 | 0.90 | 1.03 | 0.98 | 0.75 | 0.89 | 0.93 | 1.03 |
| F | 0.40 | 1.29 | 1.13 | 2.00 | 1.10 | 1.00 | 1.01 | 0.89 | 1.02 | 0.87 | 1.20 | 1.03 | 0.98 | 0.95 | 0.94 | 0.97 | 1.05 |
| G | 1.88 | 1.00 | 0.97 | 1.00 | 0.90 | 0.95 | 0.32 | 1.05 | 0.97 | 0.97 | 1.10 | 0.97 | 0.95 | 9.50 | 0.99 | 0.97 | 1.05 |
Calculating the weight of the standardized numerical value, calculating the entropy value and the difference coefficient of the evaluation factor, and obtaining the weight of each evaluation factor according to the difference coefficient; and determining the sequencing of the influence factors of the sludge dewatering process efficiency according to the sequencing of the weight of each evaluation factor.
The formula for calculating the weight of the normalized value is:
in the formula: a is ij 1 is a normalized matrix; a is ij 2 is the weight of the normalized value.
The formula for calculating the entropy of the evaluation factor is as follows:
in the formula: entropy value j Entropy value of the j-th column evaluation factor; a is ij 2 is the weight of the normalized value.
The calculation formula of the difference coefficient is as follows:
coefficient of difference j 1-entropy j
The calculation formula of the weight of the evaluation factor is as follows:
and obtaining the weight of each index to the system, wherein the larger the weight value represents the larger the influence of the index on the system efficiency, and the smaller the weight value is.
The final result is calculated as: the sludge evaluation system is 0.13 × equipment stability +0.09 × equipment operation difficulty +0.07 × equipment cleaning cycle +0.11 × equipment safety +0.03 × equipment floor area +0.12 × water content +0.15 × heat value +0.02 × amount of dioxin formed by combustion +0.05 × energy consumption +0.05 × water consumption +0.01 × manual consumption +0.02 × equipment investment intensity +0.01 × construction investment intensity +0.08 × operating cost +0.03 × amount of sewage generated +0.01 × amount of exhaust gas +0.02 × noise level.
Three indexes which have great influence on the evaluation system of the common sludge dewatering process can be seen as follows: heat value, equipment stability and moisture content.
Example 2
The embodiment relates to an efficiency evaluation system for a sludge dryness dehydration process, which specifically comprises the following steps.
S1, establishing an efficiency model of the sludge dewatering process by integrating a theoretical analysis method and an expert scoring method according to the current research situation and the current industrial development situation of the current field;
s2, establishing a criterion layer of a sludge dewatering process efficiency evaluation system according to the sludge dewatering process efficiency model in the S1;
s3, establishing an index layer of the sludge dewatering process efficiency evaluation system according to the criterion layer of the sludge dewatering process efficiency evaluation system in the S2 and the efficiency model of the sludge dewatering process in the S1, namely determining an evaluation factor;
s4, constructing a sludge drying process efficiency evaluation system according to the criterion layer and the index layer in the S2 and the S3, and calculating the weight of each layer through a formula.
The criteria layers of S2 are:
mechanical properties: refers to the relative performance of the mechanical equipment involved in the overall process run.
The treatment effect is as follows: the final effect that each index of the whole process can achieve is indicated.
Cost and energy consumption: refers to the economic expenditure and energy consumption generated in the whole process operation process.
And (3) environmental evaluation: refers to the pollution emission index generated in the whole process operation process.
The index layer of S3 has a total of 17 evaluation factors, of which: the method has the advantages of 5 mechanical properties (equipment stability, equipment operation difficulty, equipment cleaning period, equipment safety and equipment floor area), 3 treatment effects (water content, heat value and dioxin amount formed by combustion), 6 cost and energy consumption (energy consumption, water consumption, manual consumption, equipment investment intensity, building investment intensity and running cost (including medicament and maintenance cost)), and 3 environmental evaluations (sewage generation amount, waste gas emission amount and noise level). The 17 indexes are numbered 1-17 respectively, and seven batches of data A-G are collected to complete the establishment of an original data matrix, as shown in the following table 4:
table 4 measured values of evaluation factors of example 2
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | |
| A | 0.11 | 1.73 | 23.30 | 1 | 0.26 | 0.60 | 965.80 | 0.96 | 0.55 | 0.25 | 9.66 | 0.03 | 0.04 | 0.02 | 1.05 | 24.58 | 53.56 |
| B | 0.49 | 6.04 | 29.34 | 1 | 0.28 | 0.55 | 1855.21 | 1.77 | 0.52 | 0.25 | 7.90 | 0.02 | 0.04 | 0.01 | 1.09 | 25.46 | 50.05 |
| C | 0.42 | 6.82 | 25.03 | 2 | 0.32 | 0.59 | 3775.40 | 1.69 | 1.37 | 0.27 | 10.54 | 0.03 | 0.04 | 0.02 | 1.08 | 28.10 | 52.68 |
| D | 0.86 | 6.13 | 21.58 | 1 | 0.25 | 0.44 | 3697.26 | 1.83 | 0.50 | 0.06 | 9.66 | 0.03 | 0.04 | 0.02 | 1.07 | 27.22 | 54.44 |
| E | 0.40 | 6.04 | 31.07 | 1 | 0.31 | 0.68 | 2954.47 | 1.90 | 0.54 | 0.28 | 7.90 | 0.03 | 0.04 | 0.01 | 0.94 | 24.58 | 54.44 |
| F | 0.17 | 7.77 | 29.34 | 2 | 0.29 | 0.70 | 3794.72 | 1.56 | 0.58 | 0.23 | 10.54 | 0.03 | 0.04 | 0.02 | 0.99 | 25.46 | 55.31 |
| G | 0.81 | 6.04 | 25.03 | 1 | 0.24 | 0.67 | 1193.20 | 1.84 | 0.55 | 0.25 | 9.66 | 0.03 | 0.04 | 0.17 | 1.04 | 25.46 | 55.31 |
The measured values of the evaluation factors are normalized according to a normalization formula, wherein the normalization formula is as follows:
C b ＝C/C h
in the formula C b As a normalized value, C is an actual measurement value of an evaluation factor before normalization, C h Is a reference value of the evaluation factor.
C of reference value of each evaluation factor h The following were used:
equipment stability: the number of failure days per hundred days is defined as 0.5 day;
ease of operation of the apparatus: the medium dryness dehydration process is specified to be 10 days in terms of average teaching time;
equipment cleaning cycle: the medium dryness dehydration process is specified to be once every 25 days by the cleaning frequency;
equipment safety: judging by a risk grade determination table;
the floor area of the equipment is as follows: the medium dryness dehydration process is defined as 0.5m by the ratio of the occupied area to the daily throughput 2 /(t/d)；
The water content standard is as follows: the medium dryness dehydration process is calculated as 60 percent;
heat value: the heat value generated after 1kg of dewatered sludge is combusted, and the medium dryness dewatering process is set to be 4500 kj/kg;
amount of dioxin formed by combustion: the amount of dioxin produced after 1kg of dewatered sludge is combusted is specified to be 2 mg/kg;
energy consumption: the medium dryness dehydration process is defined as 0.7t of standard coal/t of dehydrated sludge based on the consumption of standard coal by 1t of dehydrated sludge;
water consumption: the water consumption of 1t of dehydrated sludge is measured and is defined as 0.3t of water/t of dehydrated sludge;
manual consumption: the method comprises the following steps of (1) counting by working day/t of oven dry sludge, wherein the regulation is 10 working days/t of oven dry sludge;
the equipment investment intensity is as follows: the stipulation is 0.03 in terms of Ten thousand yuan RMB/(t absolute dry sludge/day);
building investment intensity: the stipulation is 0.042 in terms of Ten thousand yuan RMB/(t absolute dry sludge/day);
the operation cost is as follows: the standard is 0.02 in terms of Ten thousand yuan RMB/day;
sewage generation amount: the specification is 1.2 in terms of t sewage/t dewatered sludge;
exhaust emission: in m 3 A/t dewatered sludge meter, specified as 30;
noise level: the regulation is 60dB in a day-night average effective sound level meter.
The standardized matrix is constructed in the same manner as in example 1.
Calculating the weight of the standardized numerical value, calculating the entropy value and the difference coefficient of the evaluation factor, and obtaining the weight of each evaluation factor according to the difference coefficient; the calculation mode is the same as that of the example 1, and the ranking of the influence factors of the sludge dewatering process efficiency is determined according to the ranking of the weight of each evaluation factor.
The final result is calculated as: the sludge evaluation system is 0.08 × equipment stability +0.09 × equipment operation difficulty +0.05 × equipment cleaning cycle +0.08 × equipment safety +0.05 × equipment floor area +0.10 × water content +0.18 × heat value +0.04 × amount of dioxin formed by combustion +0.03 × energy consumption +0.04 × water consumption +0.01 × manual consumption +0.02 × equipment investment intensity +0.01 × construction investment intensity +0.07 × operating cost +0.02 × amount of sewage generated +0.03 × amount of exhaust gas +0.10 × noise level.
Three indexes which have great influence on the evaluation system of the sludge dryness dehydration process are shown as follows: heat value, noise level, and moisture content.
Example 3
The embodiment relates to an efficiency evaluation system of a sludge high-dryness dehydration process, which specifically comprises the following steps.
S1, establishing an efficiency model of the sludge dewatering process by integrating a theoretical analysis method and an expert scoring method according to the current research situation and the current industrial development situation of the current field;
s2, establishing a criterion layer of a sludge dewatering process efficiency evaluation system according to the sludge dewatering process efficiency model in the S1;
s3, establishing an index layer of the sludge dewatering process efficiency evaluation system according to the criterion layer of the sludge dewatering process efficiency evaluation system in the S2 and the efficiency model of the sludge dewatering process in the S1, namely determining an evaluation factor;
s4, constructing a sludge drying process efficiency evaluation system according to the criterion layer and the index layer in the S2 and the S3, and calculating the weight of each layer through a formula.
The criteria layers of S2 are:
mechanical properties: refers to the relative performance of the mechanical equipment involved in the overall process run.
The treatment effect is as follows: the final effect that each index of the whole process can achieve is indicated.
Cost and energy consumption: refers to the economic expenditure and energy consumption generated in the whole process operation process.
And (3) environmental evaluation: refers to the pollution emission index generated in the whole process operation process.
The index layer of S3 has a total of 17 evaluation factors, of which: the method has the advantages of 5 mechanical properties (equipment stability, equipment operation difficulty, equipment cleaning period, equipment safety and equipment floor area), 3 treatment effects (water content, heat value and dioxin amount formed by combustion), 6 cost and energy consumption (energy consumption, water consumption, manual consumption, equipment investment intensity, building investment intensity and running cost (including medicament and maintenance cost)), and 3 environmental evaluations (sewage generation amount, waste gas emission amount and noise level). The 17 indexes are numbered 1-17 respectively, and seven batches of data A-G are collected to complete the establishment of an original data matrix, as shown in the following table 5:
TABLE 5 evaluation values of the evaluation factors in example 3
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | |
| A | 0.12 | 1.88 | 25.43 | 1 | 0.26 | 0.58 | 936.10 | 0.93 | 0.54 | 0.25 | 9.36 | 0.03 | 0.03 | 0.02 | 1.02 | 23.83 | 51.91 |
| B | 0.54 | 6.59 | 32.03 | 1 | 0.27 | 0.54 | 1798.16 | 1.72 | 0.50 | 0.24 | 7.66 | 0.02 | 0.04 | 0.01 | 1.06 | 24.68 | 48.51 |
| C | 0.46 | 7.44 | 27.32 | 2 | 0.31 | 0.57 | 3659.30 | 1.64 | 1.33 | 0.26 | 10.21 | 0.02 | 0.04 | 0.02 | 1.05 | 27.23 | 51.06 |
| D | 0.94 | 6.69 | 23.55 | 1 | 0.25 | 0.43 | 3583.56 | 1.77 | 0.49 | 0.06 | 9.36 | 0.03 | 0.04 | 0.02 | 1.04 | 26.38 | 52.76 |
| E | 0.43 | 6.59 | 33.91 | 1 | 0.30 | 0.66 | 2863.62 | 1.84 | 0.52 | 0.27 | 7.66 | 0.03 | 0.03 | 0.01 | 0.91 | 23.83 | 52.76 |
| F | 0.19 | 8.48 | 32.03 | 2 | 0.28 | 0.68 | 3678.02 | 1.51 | 0.56 | 0.22 | 10.21 | 0.03 | 0.03 | 0.02 | 0.96 | 24.68 | 53.61 |
| G | 0.89 | 6.59 | 27.32 | 1 | 0.23 | 0.65 | 1156.51 | 1.79 | 0.54 | 0.25 | 9.36 | 0.02 | 0.03 | 0.16 | 1.01 | 24.68 | 53.61 |
The measured values of the evaluation factors are normalized according to a normalization formula, wherein the normalization formula is as follows:
C b ＝C/C h
in the formula C b As a normalized value, C is an actual measurement value of an evaluation factor before normalization, C h Is a reference value of the evaluation factor.
C of reference value of each evaluation factor h The following were used:
equipment stability: the number of failure days per hundred days is defined as 0.5 day;
ease of operation of the apparatus: the high-dryness dehydration process is specified to be 15 days in terms of average teaching time;
equipment cleaning cycle: the high-dryness dehydration process is specified to be once every 20 days by the cleaning frequency;
equipment safety: judging by a risk grade determination table;
the floor area of the equipment is as follows: the high-dryness dehydration process is specified to be 0.8m by the ratio of the occupied area to the daily treatment capacity 2 /(t/d)；
The water content standard is as follows: the high-dryness dehydration process is calculated by 50 percent;
heat value: the calorific value generated after 1kg of dewatered sludge is combusted, and the specification of the high-dryness dewatering process is 4800 kj/kg;
amount of dioxin formed by combustion: the amount of dioxin produced after 1kg of dewatered sludge is combusted is specified to be 2 mg/kg;
energy consumption: the high dehydration process is specified to be 0.8t of standard coal/t of dehydrated sludge based on the consumption of standard coal by 1t of dehydrated sludge;
water consumption: the water consumption of 1t of dehydrated sludge is measured and is defined as 0.3t of water/t of dehydrated sludge;
manual consumption: the method comprises the following steps of (1) counting by working day/t of oven dry sludge, wherein the regulation is 10 working days/t of oven dry sludge;
the equipment investment intensity is as follows: the stipulation is 0.03 in terms of Ten thousand yuan RMB/(t absolute dry sludge/day);
building investment intensity: the stipulation is 0.042 in terms of Ten thousand yuan RMB/(t absolute dry sludge/day);
the operation cost is as follows: the standard is 0.02 in terms of Ten thousand yuan RMB/day;
sewage generation amount: the specification is 1.2 in terms of t sewage/t dewatered sludge;
exhaust emission: in m 3 A/t dewatered sludge meter, specified as 30;
noise level: the regulation is 60dB in a day-night average effective sound level meter.
The standardized matrix is constructed in the same manner as in example 1.
Calculating the weight of the standardized numerical value, calculating the entropy value and the difference coefficient of the evaluation factor, and obtaining the weight of each evaluation factor according to the difference coefficient; the calculation mode is the same as that of the example 1, and the ranking of the influence factors of the sludge dewatering process efficiency is determined according to the ranking of the weight of each evaluation factor.
The final result is calculated as: the sludge evaluation system is 0.08 × equipment stability +0.04 × equipment operation difficulty +0.07 × equipment cleaning cycle +0.09 × equipment safety +0.05 × equipment floor area +0.10 × water content +0.20 × heat value +0.01 × amount of dioxin formed by combustion +0.04 × energy consumption +0.04 × water consumption +0.01 × manual consumption +0.02 × equipment investment intensity +0.01 × construction investment intensity +0.06 × operating cost +0.02 × amount of sewage generated +0.03 × amount of exhaust gas +0.12 × noise level.
Three indexes which have great influence on the evaluation system of the sludge high-dryness dehydration process are shown as follows: heat value, noise level, and moisture content.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (10)
1. The efficiency evaluation method of the sludge dewatering process is characterized by comprising the following steps of:
(1) selecting an evaluation factor capable of reflecting the efficiency of the sludge dewatering process; determining a reference value of the evaluation factor;
(2) detecting actual measurement values of evaluation factors of sludge dewatering, and calculating to obtain standardized values of the evaluation factors through a standardized formula; obtaining a standardized matrix according to the standardized values;
the batch of the behavior actual measurement data of the standardized matrix, wherein the column of the standardized matrix is each evaluation factor;
(3) calculating the weight of the standardized numerical value, calculating the entropy value and the difference coefficient of the evaluation factor, and obtaining the weight of each evaluation factor according to the difference coefficient; determining the sequencing of the influence factors of the sludge dewatering process efficiency according to the sequencing of the weight of each evaluation factor;
in the step (1), the evaluation factors comprise four criteria layers of mechanical performance, treatment effect, cost and energy consumption and environment evaluation.
2. The method for evaluating the efficiency of a sludge dewatering process according to claim 1, wherein the mechanical properties include five indexes of equipment stability, equipment operation difficulty, equipment cleaning period, equipment safety and equipment floor space.
3. The method for evaluating the efficiency of a sludge dewatering process according to claim 1, wherein the treatment effect includes three indexes of water content, calorific value and amount of dioxin formed by combustion.
4. The method for evaluating the efficiency of a sludge dewatering process according to claim 1, wherein the cost and energy consumption include six indexes of energy consumption, water consumption, labor consumption, equipment investment intensity, building investment intensity and operation cost.
5. The method for evaluating the efficiency of a sludge dewatering process according to claim 1, wherein the environmental evaluation includes three indexes of sewage production, exhaust emission, and noise level.
6. The method for evaluating the efficiency of a sludge dewatering process according to any one of claims 1-5, wherein in the step (2), the standardized formula is: c b ＝C/C h (ii) a In the formula C b As a normalized value, C is an actual measurement value of an evaluation factor before normalization, C h Is a reference value of the evaluation factor.
7. The method for evaluating sludge dewatering process performance according to claim 6, wherein in the step (3), the weight of the normalized value is calculated by the formula:
in the formula: a is ij 1 is the normalized matrix element in step (1); a is ij 2 is the weight of the normalized value.
8. The method for evaluating efficiency of a sludge dewatering process according to claim 7, wherein in the step (3), the formula for calculating the entropy of the evaluation factor is as follows:
in the formula: entropy value j Entropy value of the j-th column evaluation factor; a is ij 2 is the weight of the normalized value.
9. The method for evaluating the efficiency of a sludge dewatering process according to claim 8, wherein in the step (3), the calculation formula of the difference coefficient is:
coefficient of difference j 1-entropy j 。
10. The method for evaluating the efficiency of a sludge dewatering process according to claim 9, wherein in the step (3), the weight of the evaluation factor is calculated by the formula:
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