An evaluation method for the economic production organization of sintering

Abstract

The present invention relates to a method for evaluating the economic production organization of sintering, belonging to the technical field of iron and steel. The method comprises the following steps: S1: Based on low utilization coefficient production, production data for a certain month is established; S2: High utilization coefficient production is adopted to calculate the relationships between the unit consumption of quicklime and the utilization coefficient, the power consumption and the utilization coefficient, and the cost loss of start-up and shutdown; S3: The production cost of the high coefficient is constructed; The present invention focuses on selecting the most economical production organization mode for production in the case of rich sintering production capacity to reduce the cost of sinter.

Description

Technical Field

[0001] The present invention belongs to the technical field of iron and steel, and relates to a method for evaluating the economic production organization of sintering. Background Art

[0002] The existing research on the economic performance of sintering mainly involves the field of ore blending. There is less comparative research on the economy of high utilization coefficient production and low utilization coefficient production under the condition of rich sintering production capacity. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a method for evaluating the economic production organization of sintering, which focuses on selecting the most economical production organization mode for production under the condition of rich sintering production capacity, and reducing the cost of sinter.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] A method for evaluating the economic production organization of sintering, the method comprising the following steps:

[0006] S1: Based on low utilization coefficient production, establish the production data of a certain month; including sintering machine area, utilization coefficient, calendar time, operation rate, output, unit consumption of quicklime, unit consumption of limestone, power consumption, quicklime cost, limestone cost, power consumption cost and total cost;

[0007] Among them: the sintering machine area, utilization coefficient, operation time, output, unit consumption of quicklime, unit consumption of limestone and power consumption are all original production data;

[0008] Quicklime cost = unit consumption of quicklime × unit price of quicklime;

[0009] Limestone cost = unit consumption of limestone × unit price of limestone;

[0010] Power consumption cost = power consumption × unit price of electricity;

[0011] Total cost = quicklime cost + limestone cost + power consumption cost

[0012] S2: Adopt high utilization coefficient production, and calculate the relationship between unit consumption of quicklime and utilization coefficient, the relationship between power consumption and utilization coefficient, and the relationship between start-up and shutdown cost losses;

[0013] S21: Establish the relationship between unit consumption of quicklime and utilization coefficient

[0014] Under the condition that the raw material structure remains basically unchanged, adopt the production data from March to August;

[0015] Calculate the influence of every 1 kg of quicklime on the utilization coefficient and the trend direction;

[0016] S22: Establish the relationship between power consumption and utilization coefficient

[0017] Calculate the constant value of the daily power consumption of the sintering machine.

[0018] S23: Calculate the cost loss of startup and shutdown

[0019] Startup loss: It takes 20 minutes for the sintering machine to start the desulfurization induced draft fan and the main sintering exhaust fan to normal. Among them, the desulfurization induced draft fan runs for 20 minutes, and the main sintering exhaust fan runs for 10 minutes. The electricity price is 0.70 yuan. The calculation is as follows:

[0020] Loss cost = 8900×(20÷60)×0.70 + 6500*0.6×(10÷60)×0.70 = 2531 yuan

[0021] Loss due to material waiting: After the main exhaust starts normally, start the dust removal system in sequence until it takes 30 minutes for the batching and mixing system to feed materials to the sintering machine. According to the normal hourly power consumption of 18600 kwh for the sintering machine and the electricity price of 0.70 yuan, the calculation is as follows:

[0022] Cost loss = 18600×(30÷60)×0.70 = 6510 yuan

[0023] Shutdown loss: From the start of the shutdown of the sintering machine, stop the high-voltage equipment such as dust removal until the desulfurization induced draft fan stops running, which takes about 20 minutes. Calculated according to the compromise full load of 10 minutes, based on the normal hourly power consumption of 18600 kwh for the sintering machine and the electricity price of 0.70 yuan, the calculation is as follows:

[0024] Cost loss = 18600×(10÷60)×0.70 = 2170 yuan

[0025] That is, the increased cost of a normal startup and shutdown = startup loss + loss due to material waiting + shutdown loss = 11211 yuan.

[0026] S3: Construct the production cost of the high coefficient

[0027] On the basis of low coefficient production, using the law of production data, with the same output as the basis, construct the target utilization coefficient, operation rate, unit consumption of quicklime, unit consumption of limestone, power consumption and number of startup and shutdowns.

[0028] Among them: The utilization coefficient is the set target.

[0029] Operation rate = output ÷ utilization coefficient ÷ sintering machine area ÷ calendar time

[0030] Unit consumption of quicklime = (set target - utilization coefficient)×mean coefficient + unit consumption of quicklime

[0031] Unit consumption of limestone = (Unit consumption of quicklime - Unit consumption of quicklime in Table 2) × CaO content in quicklime ÷ CaO content in limestone + Unit consumption of limestone (Basis for sintering process adjustment: Unit consumption of quicklime × CaO content in quicklime = Unit consumption of limestone × CaO content in limestone)

[0032] Electricity consumption = Average electricity consumption ÷ 24 hours ÷ Sintering machine area ÷ Utilization coefficient

[0033] The number of start - up and shutdown times is used to calculate the shutdown time = Calendar time × (100 - Operating rate) ÷ 100 ÷ Interval time for each shutdown and startup (related to the total inventory in the blast furnace sinter ore bin, currently production must be resumed about 10 hours after each shutdown).

[0034] Cost of quicklime = Unit consumption of quicklime × Unit price of quicklime

[0035] Cost of limestone = Unit consumption of limestone × Unit price of limestone

[0036] Cost of electricity consumption = Electricity consumption × Unit price of electricity

[0037] Cost of start - up and shutdown = Cost of start - up and shutdown × Number of start - up and shutdown times ÷ Output

[0038] Total cost = Cost of quicklime + Cost of limestone + Cost of electricity consumption + Cost of start - up and shutdown.

[0039] Under full - load production, the process control parameters remain basically unchanged. In October, the unit consumption of quicklime, electricity consumption, and unit consumption of limestone are basically consistent with the model, with small errors. It is also found that the production cost with a high coefficient is about 1.23 yuan / ton higher than that with a low coefficient, and the monthly loss is about 1.23 × 364357 = 445,200 yuan.

[0040] The beneficial effects of the present invention are as follows:

[0041] The present invention focuses on selecting the most economical production organization mode for production when the sintering production capacity is abundant, so as to reduce the cost of sintered ore.

[0042] Other advantages, objectives, and features of the present invention will be described to some extent in the subsequent specification, and to some extent, they will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in detail preferably with reference to the accompanying drawings, where:

[0044] Figure 1 is the flow chart of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0045] The following describes the implementation modes of the present invention through specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0046] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation to the present invention; in order to better illustrate the embodiments of the present invention, some components in the drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0047] In the drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and should not be construed as a limitation to the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0048] Currently, the steel industry is generally in a slump. Some steel mills implement production cuts or shutdowns to achieve the goal of reducing losses. In the case of production cuts in steel production capacity, sintered ore will inevitably be in surplus, and sintering production will inevitably face two choices. One is to produce at a low utilization coefficient to reduce the unit consumption of quicklime, and the other is to pursue high utilization coefficient production to reduce power consumption. The present invention establishes an evaluation model and selects the optimal economic mode of production.

[0049] I. Model description

[0050] Due to the surplus of sintering production capacity, sintering achieves the goal of production reduction by reducing the utilization coefficient or shutting down. Regardless of the organizational method adopted, the output of sintered ore is a fixed value in a month, and the material input (ore, fuel) cost and the fixed asset depreciation and amortization cost in the sintered ore cost are also fixed values. The variables are the unit consumption of quicklime, the unit consumption of limestone, the power consumption, and the cost generated by starting and stopping. This article analyzes the variables and establishes a model.

[0051] II. Establishing the model

[0052] 2.1 Based on low utilization coefficient production, the production data for a certain month is established in Table 1.

[0053] Table 1 Production Data Table for a Certain Month

[0054]

[0055] Among them: the sintering machine area, utilization coefficient, operation time, output, specific consumption of quicklime, specific consumption of limestone, and power consumption are all original production data;

[0056] Quicklime cost = specific consumption of quicklime × unit price of quicklime (738 yuan / t)

[0057] Limestone cost = specific consumption of limestone × unit price of limestone (100 yuan / t)

[0058] Power consumption cost = power consumption × unit price of electricity (0.7 yuan / kwh)

[0059] Total cost = quicklime cost + limestone cost + power consumption cost

[0060] 2.2 Adopting high utilization coefficient production, it involves the relationship between the specific consumption of quicklime and the utilization coefficient, the relationship between power consumption and the utilization coefficient, and the relationship between start-up and shutdown cost losses.

[0061] 2.2.1 Relationship between the specific consumption of quicklime and the utilization coefficient

[0062] Under the condition that the raw material structure remains basically unchanged, the production data from March to August is shown in Table 2.

[0063] Table 2 Production Data Table from March to August

[0064]

[0065] It can be seen from Table 2 that every 1 kg of quicklime affects the utilization coefficient by approximately 0.026 t / m 2 .h, and the trend directions are the same.

[0066] 2.2.2 Relationship between power consumption and the utilization coefficient

[0067] Take the data of the months with a relatively high sintering operation rate. Since most of the sintering power consumption comes from dust removal, cooling, and main extraction, and the daily control is relatively stable, that is, the total daily power consumption is basically fixed.

[0068] Table 3 Relationship Table between Power Consumption and Utilization Coefficient

[0069]

[0070] It can be seen from Table 3 that the daily power consumption of the sintering machine is basically constant at 401301 kwh.

[0071] 2.2.3 Start-up and shutdown cost losses

[0072] Start-up loss: It takes 20 minutes for the sintering machine to start the desulfurization induced draft fan and the main sintering exhaust fan to normal operation. Among them, the desulfurization induced draft fan (8900 kw) runs for 20 minutes, and the main sintering exhaust fan (6500 kw, frequency conversion operation is calculated at 60%) runs for 10 minutes. The electricity price is 0.70 yuan. The calculation is as follows:

[0073] Loss cost = 8900×(20÷60)×0.70 + 6500*0.6×(10÷60)×0.70 = 2531 yuan,

[0074] Loss due to material shortage: After the main exhaust fan starts normally, start the dust removal system in sequence until it takes 30 minutes for the batching and mixing system to feed materials to the sintering machine. According to the normal hourly power consumption of 18600 kwh of the sintering machine and the electricity price of 0.70 yuan, the calculation is as follows:

[0075] Cost loss = 18600×(30÷60)×0.70 = 6510 yuan

[0076] Shutdown loss: From the start of the shutdown of the sintering machine, stop the high-voltage equipment such as dust removal until the desulfurization induced draft fan stops running, which takes about 20 minutes. Calculated according to the compromise full load of 10 minutes, according to the normal hourly power consumption of 18600 kwh of the sintering machine and the electricity price of 0.70 yuan, the calculation is as follows:

[0077] Cost loss = 18600×(10÷60)×0.70 = 2170 yuan

[0078] That is, a normal start-up and shutdown increases the cost = start-up loss + loss due to material shortage + shutdown loss = 11211 yuan.

[0079] 2.3 High coefficient production cost structure

[0080] On the basis of low coefficient production, using the production data law in 2.2 above, with the same output as the basis, construct the target utilization coefficient, operating rate, unit consumption of quicklime, unit consumption of limestone, power consumption, and start-up and shutdown times.

[0081] Table 4 High coefficient production cost table

[0082]

[0083] Among them: The utilization coefficient is the set target.

[0084] Operating rate = output ÷ utilization coefficient ÷ sintering machine area ÷ calendar time

[0085] Unit consumption of quicklime = (set target - utilization coefficient in Table 2)×mean coefficient in Table 2 + unit consumption of quicklime in Table 2

[0086] Limestone unit consumption = (Quicklime unit consumption in Table 3 - Quicklime unit consumption in Table 2) × CaO in quicklime ÷ CaO in limestone + Limestone unit consumption in Table 2 (Basis for sintering process adjustment: Quicklime unit consumption × CaO in quicklime = Limestone unit consumption × CaO in limestone)

[0087] Power consumption = Average power consumption in Table 3 ÷ 24h ÷ Sintering machine area ÷ Utilization coefficient in Table 3

[0088] The number of start - up and shutdown times is used to calculate the shutdown time = Calendar time × (100 - Operating rate) ÷ 100 ÷ Interval time for each start - up and shutdown (Related to the total inventory of blast furnace sinter in the bin. Currently, production must resume about 10h after each shutdown).

[0089] Quicklime cost = Quicklime unit consumption × Quicklime unit price

[0090] Limestone cost = Limestone unit consumption × Limestone unit price

[0091] Power consumption cost = Power consumption × Power unit price

[0092] Start - up and shutdown cost = Start - up and shutdown cost in 2.2.3 × Number of start - up and shutdown times ÷ Output

[0093] Total cost = Quicklime cost + Limestone cost + Power consumption cost + Start - up and shutdown cost.

[0094] The data in Table 1 above are the actual production data in July. The production data in October are as follows:

[0095] Table 5 Production data table in October

[0096]

[0097] It can be seen from Table 5 that production was basically at full capacity this month, and the process control parameters remained basically unchanged. The quicklime unit consumption, power consumption, and limestone unit consumption in October were basically consistent with the model, with a small error. It was also found that the production cost with a high coefficient was about 1.23 yuan / ton higher than that with a low coefficient, and the monthly loss was about 1.23 × 364357 = 445,200 yuan. This invention has great economic value.

[0098] Principle of cost saving: In October, a high - utilization - coefficient production test was carried out for sintering. With the process control parameters remaining basically unchanged, the quicklime unit consumption, power consumption, and limestone unit consumption in October were basically consistent with the model prediction. Compared with the low - utilization - coefficient production, the quicklime unit consumption increased by 4.47 kg / t, the limestone unit consumption decreased by 7.60 kg / t, and the power consumption decreased by 3.02 kw.h / t. The unit price of quicklime is 738 yuan / t, the unit price of limestone is 100 yuan / t, and the unit price of power is 0.70 yuan / t. Through comprehensive calculation, the production cost with a high coefficient is about 0.63 yuan / ton higher than that with a low coefficient. Calculated based on a monthly output of 342,100 tons, the monthly loss is about 0.63 × 34.21 = 215,500 yuan.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An evaluation method for sintering economic production organization, characterized in that: The method includes the following steps: S1: Based on low utilization coefficient production, establish the production data for a certain month, including sintering machine area, utilization coefficient, calendar time, operation rate, output, unit consumption of quicklime, unit consumption of limestone, power consumption, cost of quicklime, cost of limestone, cost of power consumption, and total cost; Among them, the sintering machine area, utilization coefficient, operation time, output, unit consumption of quicklime, unit consumption of limestone, and power consumption are all original production data; Cost of quicklime = unit consumption of quicklime × unit price of quicklime; Cost of limestone = unit consumption of limestone × unit price of limestone; Cost of power consumption = power consumption × unit price of electricity; Total cost = cost of quicklime + cost of limestone + cost of power consumption S2: Adopt high utilization coefficient production, and calculate the relationships between unit consumption of quicklime and utilization coefficient, power consumption and utilization coefficient, and cost loss of start-up and shutdown; S21: Establish the relationship between unit consumption of quicklime and utilization coefficient Under the condition of unchanged raw material structure, use the production data from March to August; Calculate the impact of every 1 kg of quicklime on the utilization coefficient and the trend direction; S22: Establish the relationship between power consumption and utilization coefficient Calculate the constant value of the daily power consumption of the sintering machine; S23: Calculate the cost loss of start-up and shutdown Start-up loss: It takes 20 minutes for the sintering machine to start the desulfurization induced draft fan and the main sintering exhaust fan to normal. Among them, the desulfurization induced draft fan runs for 20 minutes, and the main sintering exhaust fan runs for 10 minutes. The electricity price is 0.70 yuan. The calculation is as follows: Loss cost = 8900×(20÷60)×0.70 + 6500×0.6×(10÷60)×0.70 = 2531 yuan Material waiting loss: After the main exhaust starts normally, start the dust removal system in sequence until it takes 30 minutes for the batching and mixing system to feed the sintering machine; According to the normal hourly power consumption of the sintering machine of 18600 kwh and the electricity price of 0.70 yuan, the calculation is as follows: Cost loss = 18600×(30÷60)×0.70 = 6510 yuan Shutdown loss: From the start of the shutdown of the sintering machine, stop the high-voltage equipment such as dust removal until the desulfurization induced draft fan stops running, which takes 20 minutes. According to the compromise full load of 10 minutes, and the normal hourly power consumption of the sintering machine of 18600 kwh and the electricity price of 0.70 yuan, the calculation is as follows: Cost loss = 18600×(10÷60)×0.70 = 2170 yuan That is, a normal start-up and shutdown increases the cost = start-up loss + material waiting loss + shutdown loss = 11211 yuan; S3: Construct the production cost of high coefficient On the basis of low coefficient production, using the law of production data, with the same output as the basis, construct the target utilization coefficient, operation rate, unit consumption of quicklime, unit consumption of limestone, power consumption, and number of start-up and shutdowns; Among them, the utilization coefficient is the set target; Operation rate = output ÷ utilization coefficient ÷ sintering machine area ÷ calendar time Unit consumption of quicklime = (set target - utilization coefficient) × mean coefficient + unit consumption of quicklime Unit consumption of limestone = (unit consumption of quicklime - unit consumption of quicklime) × CaO of quicklime ÷ CaO of limestone + unit consumption of limestone; Basis for sintering process adjustment: unit consumption of quicklime × CaO of quicklime = unit consumption of limestone × CaO of limestone; Power consumption = mean power consumption ÷ 24h ÷ sintering machine area ÷ utilization coefficient The number of start-up and shutdown cycles is used to calculate the downtime. Downtime = Calendar time × (100 - Operating rate) ÷ 100 ÷ Interval time between each shutdown and startup; Quicklime cost = Quicklime unit consumption × Quicklime unit price Limestone cost = Limestone unit consumption × Limestone unit price Power consumption cost = Power consumption × Power unit price Start-up and shutdown cost = Start-up and shutdown cost × Number of start-up and shutdown cycles ÷ Output Total cost = Quicklime cost + Limestone cost + Power consumption cost + Start-up and shutdown cost.

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