JPS6147535A - Apparatus for controlling feeding of shaft furnace coke - Google Patents

Abstract

PURPOSE:To enable the accurate measurement of the moisture of coke, the accurate weighing of necessary quantity and the batchwise charging classified by particle size of coke into a furnace, by hourly calculating the stock coke loading quantity and weighed residual quantity value on a belt conveyor and stopping a feeding apparatus at the point of time when the difference between both of them reached predetermined quantity or less. CONSTITUTION:Estimated values over several past batches of the feeding apparatus indicated by a feeding apparatus indication signal S1 are averaged to be outputted as the feeding speed VF of a lately batch. Next, the signal showing this feeding speed VF is inputted to the stock material loading quantity operation part 13 on BC3 to hourly operate the stock material loading quantity WR on BC3 and the operated value is inputted to a feeding stop timing control part 14. This feeding stop timing control part 14 operates a weighed residual quantity value WS from the weighing objective quantity WTGT set by a weighing objective value indication signal S2 and the weighed value W in a weighing hopper 4 and outputs a feeding stop signal S3 at the point of time when the difference WS-WR of the weighed residual quantity value WS and the stock material loading quantity WR transmitted from the stock material loading quantity operation part 13 on BC3 came to WS-WR<=C. By this method, the feeding apparatus is stopped.

Description

[Detailed description of the invention] [Technology! ! 7] The present invention relates to blast furnace coke cutting and weighing equipment.

[Prior Art] FIG. 2 is a schematic diagram of a known blast furnace coke cutting and weighing equipment. Different brands of coke are stored in each of the storage tanks 11 to 14, and cutting devices 21 to 24 are installed in each of the storage tanks 11 to 14, so that a desired brand of coke can be stored. It is cut out by a cutting device, transported by a belt conveyor (hereinafter referred to as BC) 3, and weighed by a weighing hopper 4. (Hereinafter, this weighing process will be referred to as patching.) Conventionally, in order to shorten the weighing time and improve the accuracy of weighing, the weighed value has reached within a certain range from the target value (usually 85% of the target value). ), the cutting devices 21 to 24 were stopped, the BC3 was switched from high speed to low speed, and when the weighed value reached the target value, the BC3 was stopped.

In this method, the coke is weighed to the target value, but there is still 5 coke left on top of the stopped BC3.In this way, there should have been some coke left on top of BO2 in the previous batch as well. Therefore, in the weighing hopper 4 of this batch, there are coke 6 left on top of BO3 in the previous batch and coke 7 cut out in this batch.
There will be a mixture of Therefore, if the brand of coke in the current batch is different from the brand of coke in the previous batch, there are the following three problems. Namely.

-Since each brand of coke has a different moisture content α, it was not possible to accurately measure the moisture content of the brands of coke in this batch using the neutron moisture meter 8.

■The required amount of coke is first given as a dry amount (amount that does not include moisture), and the value obtained by adding the moisture in the coke to this dry amount value W2 is set as the weighing target value WTGr, so the weighing target value WTg
T is determined by the formula, and if different brands of coke with different moisture contents α are mixed in the weighing hopper 4, the required dry weight value WsRt cannot be obtained even if the coke is weighed up to the target weighing value W1. ′■ Because different brands of coke are mixed in the weighing hopper, coke with different particle sizes are charged into the furnace at the same time, which disrupts the gas flow distribution in the furnace, causing local abnormalities in the furnace and overall furnace condition. This led to deterioration in operational performance.

[Object of the Invention] The object of the present invention is to reduce the amount of coke from the previous batch mixed in weighed coke, to accurately measure the moisture content of coke, accurately weigh the required amount of coke, and to reduce the amount of coke in the furnace for each batch. An object of the present invention is to provide a blast furnace coke cutting control device that enables charging of coke according to particle size.

[Configuration 1 of the Invention] The present invention calculates the amount of raw material loaded on the belt conveyor and the weighed remaining amount value (= target weighing value - the weighed value measured by the weighing hopper) from time to time, and calculates the difference between the weighed remaining amount value and the loaded material amount. The cutting device is stopped when the amount becomes less than a predetermined amount.

That is, the blast furnace coke cutting control device of the present invention has Lf
A raw material loading amount calculation means for calculating the amount of coke loaded on the belt conveyor from the product of the cutting speed obtained from the ffi speed and the elapsed time from the start of cutting to the current time and the current weighing value of the weighing hopper, and a weighing target value. A cut-off mechanism that subtracts the loaded coke amount calculated by the raw material loaded amount calculation means from the weighed remaining amount value for the weight, and outputs a cut-off stop old signal to the cut-out device when the subtraction result becomes less than a predetermined amount. It is characterized by being equipped with output timing control means.

An embodiment of the present invention is an apparatus according to the claims, which includes a weighing speed calculation means for calculating a weighing speed at which the weighing hopper weighs coke, and a weighing speed calculation means for calculating the weighing speed at which the coke is weighed by the weighing hopper, and a weighing speed calculated by the weighing speed calculation means. The estimated value of the cutting speed of the device is calculated and stored internally, and the average value of the estimated values of the past several batches of the cutting device is calculated to determine the current cutting speed of 1<T. The apparatus further includes a cutting speed calculating means for outputting the cutting speed as a speed.

[Example 1] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a blast furnace coke cutting and weighing equipment equipped with a blast furnace coke cutting control device according to an embodiment of the present invention.

At the end of each batch, the weighing speed calculation unit 11
The weighing value W measured in is output, and the weighing speed υW of each batch is calculated and output from the weighing value W and the time required for weighing. The cutting speed calculation unit 12 inputs a cutting device designation signal S5 from a control panel (not shown) for each batch, and calculates the cutting capacity ratio of each cutting device 21 to 24, which is known in advance, at the end of each batch. An estimated value of the cutting speed of the cutting device designated by the cutting device designation signal Si is obtained from the weighing speed Vw calculated by the weighing speed calculating section 11, and this estimated value is stored internally. The average value (moving average, exponential average part) of the estimated values of the past few patches of the cutting device designated by the cutting device designation signal S1 that is stored is calculated and set as the cutting speed υF of the current batch. Output. The Be fine raw material loading amount calculation section 13 calculates the cutting speed 'l/F (set value for the first batch) output from the cutting speed calculation section 12 and the elapsed time 1F from the start of cutting of the current batch to the present time. EC3
The loaded raw material amount WR is output. The cutout stop timing control unit 14 inputs the weight target value designation signal S2 from the control panel (not shown), and calculates the weight target value WTcr specified by the weighing target value designation signal S2 and the weight value measured by the weighing hopper 4. Take the difference from the weighed value W and set this as the weighed remaining amount Ws,
When the difference between this weighed residual amount value Ws and the raw material tower I & amount WR calculated by the Be top raw material loading amount calculating section 13 satisfies the relationship Ws-WR≦C, the cut-out device is The cutting device is stopped by outputting a cutting stop signal S3. In addition.

C is the raw material F5 on EC3 due to variations in cutting speed.
This is a safety constant to prevent an error in the loading amount WR and an insufficient cutting amount.

Next, the operation of this embodiment will be explained.

A cutting device designation signal S1 that specifies a cutting device corresponding to a desired brand of coke is sent to the cutting speed calculation unit 12, and a weighing target value designation signal S2 is sent to the cutting stop timing control unit 14.
, the cutting device is specified and the target weight value W is input.
w is set. First, the cutting speed calculation section 12 calculates the weighing speed υW calculated by the weighing speed calculation section 11 at the end of the batch.
It is requested from and stored internally. The cutting speed υF of the current batch is calculated by averaging the estimated values of the cutting device specified by the cutting device designation signal S1 over the past several batches.
Next, a signal indicating this cutting speed υF is input to the Be raw material loading amount calculating section 13, and the raw material loading amount WR on the EC3 is calculated every moment.
A signal indicating this is input to the cutting stop timing control section 14. The cutout stop timing control unit 14 calculates a weighing remaining amount value Ws from the weighing target value Ww set by the weighing target value designation signal S2 and the weighing value W in the weighing hopper 4, and calculates the weighing remaining amount value Ws and the weighing remaining amount value Ws. The difference Ws-WR in the raw material loading amount WFI transmitted from the BC upper raw material tower a amount calculation unit 13 is Ws-W
When R≦C, a cutting stop signal S3 is output to the cutting device. This causes the cutting device to stop. In this way, when the weighing of the current batch is finished, the weighing speed υW of the current punch is calculated in the weighing speed calculating section 11, and a signal indicating this weighing speed υ1 is input to the cutting speed calculating section 12, where the weighing speed υW of the current punch is calculated. An estimated value of the cutting speed of the cutting device specified by the cutting device designation signal S1 is obtained, and this estimated value is stored inside the cutting speed calculating section 12, and the cutting speed υ, used for calculations.

In this way, since the cutting of coke is controlled while calculating the raw material loading amount W8 on the BO3 every moment, only a small amount of coke remains on the EC3 when weighing is completed.

Furthermore, due to the safety constant C, the cutting amount is reduced to the weighing target value WW.
This prevents shortages without reaching . Therefore, the cutout amount will not fall short of the target weighing value, and only a small amount of coke paper from the previous batch will be mixed in the weighing hopper 4.

[Effect of the invention J As explained above, according to the present invention, E
Even if the amount of coke remaining in the C3 form is small and the brand of coke in the previous batch is different from the brand of coke in the current batch, the amount of different brands of coke mixed in the weighed coke will be small. Therefore, it is possible to accurately measure the moisture content of the coke brand of the current batch using the neutron moisture meter 8, and it is also possible to determine the L'f amount that accurately includes the required dry weight value. Furthermore, since coke having the same particle size can be charged into the furnace for each punch, it is possible to maintain a good gas flow distribution in the furnace and improve operational performance.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a blast furnace coke cutting and visiting control device according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of a blast furnace coke cutting and weighing equipment. I I"' l 4...Storage fyi tank 2,~24...Cutting amount jδ 3...Belt conveyor 4...Weighing hopper 5,6.7...Coke 8...Neutron moisture Total 11... Scale speed calculation section 12... Cutting speed calculation section 13... Raw material loading amount on BC @ calculation section 14... Cutting stop timing control section W... Weighing value WR... - Raw material loading amount WTGr... Weighing target value υW... Weighing speed υF... Cutting speed Sl... Cutting device designation signal Sl... Weighing target value designation signal S3... Cutting stop signal

Claims (1)

[Scope of Claim] A blast furnace coke cutting and weighing equipment having a plurality of storage tanks, a plurality of cutting devices provided corresponding to each storage tank, a belt conveyor, and a weighing hopper, comprising: a weighing speed; a raw material loading amount calculating means for calculating the coke loading amount on the belt conveyor from the product of the cutting speed obtained from the calculation and the elapsed time from the start of cutting to the present time and the current weighing value of the weighing hopper; Cutting stop timing control means for subtracting the coke loading amount calculated by the raw material loading amount calculation means from the residual amount value and outputting a cutting stop signal to the cutting device when the subtraction result becomes a predetermined amount or less. A blast furnace coke cutting control device characterized by comprising: