JPH0380834B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] 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. Each of the storage tanks 1 ₁ to 1 ₄ stores coke of different brands, and each of the storage tanks 1 ₁ to 1 ₄ stores coke of different brands.
Cutting devices 2 ₁ to _{2 4} are installed in each of the cokes, and a desired brand of coke is cut out by the corresponding cutting device and transported by a belt conveyor (hereinafter referred to as BC) 3. It is weighed in the weighing hopper 4. (Hereinafter, this weighing amount of coke or its cutting and weighing process is called a batch.) Conventionally, in order to shorten the weighing time and improve the weighing accuracy, the weighed value is within a certain range of the target value. When the weighing value reaches the target value (usually 95% of the target value), stop the cutting devices ₂₁ to ₂₄ , switch the BC3 from high speed to low speed, and when the weighed value reaches the target value,
BC3 was stopped.

[Problems to be Solved by the Invention] In this method, coke is weighed to a target value, but the remaining 5 coke remains on top of the stopped BC3.
will occur. In this way, coke should have remained on top of BC3 in the previous batch, so in weighing hopper 4 of this batch,
Coke 6 left on top of BC3 from the previous batch
and coke 7 cut out in this batch will be mixed together. Therefore, if the brand of coke in the current batch is different from the brand of coke in the previous batch, the following two problems arise. In other words, (1) The required amount of coke is first given as a dry weight (amount that does not include water), and if the value obtained by adding the water in the coke to this dry weight value W _set is the weighing target value W _TGT , then the weighing target The value W _TGT is determined by the formula W _TGT = 1/1 - αW _set , but if different brands of coke with different moisture contents α are mixed in the weighing hopper 4, the neutron moisture meter 8 will determine the current value. Since it is not possible to accurately measure the moisture content of batches of coke brands, the necessary dry weight value _Wset could not be obtained even if the coke was weighed to the target weighing value W _TGT .

(2) 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 the overall furnace. As a result of the deteriorating business conditions, operational results were worsening.

The purpose of the present invention is to reduce the amount of coke from the previous batch mixed in the weighed coke and accurately measure the moisture content of the coke. An object of the present invention is to provide a blast furnace coke cutting control device that enables charging by particle size.

[Means for Solving the Problems] The present invention obtains 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 weighed remaining amount value and the weighed raw material value. The cutting device is stopped when the difference in loading amount becomes less than a predetermined negative amount.

That is, the blast furnace coke cutting control device of the present invention calculates the product of the average value of the cutting speed obtained from the weighing speed for each batch up to the previous batch and the elapsed time from the start of cutting to the present time, and the weighing speed. a raw material loading amount calculating means for calculating the coke loading amount on the belt conveyor from the current weighing value of the hopper; and subtracting the coke loading amount calculated by the raw material loading amount calculating means from the weighing remaining amount value with respect to the weighing target value; A cutting stop control means is provided for outputting a cutting stop signal to the cutting device when the result of this subtraction becomes less than a predetermined negative amount.

[Example] 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 calculates the weighing value W measured by the weighing hopper 4 (a value obtained by subtracting the coke weight remaining in the weighing hopper 4 from the weight measurement value at the weighing hopper 4 at the start of weighing). is input, and the weighing speed υ _W is calculated and output from the weighing value W and the time required for weighing. The cutting speed calculation unit 12 is
A cutting device designation signal S ₁ is input from a control panel (not shown) for each batch, and at the end of each batch, the cutting capacity ratio and weighing speed calculation unit 11 of each cutting device 2 ₁ to 2 ₄ that are known in advance are input. The estimated value of the cutting device specified by the cutting device designation signal _S1 is calculated from the weighing speed υ _W calculated by The average value (moving average, exponential average, etc.) of the estimated values of the past batches of the cutting device designated by the cutting device designation signal _S1 is calculated and output as the cutting speed υ _F of the current batch. The BC top raw material loading amount calculating section 13 calculates the cutting speed υ _F (set value for the first batch) output from the cutting speed calculating section 12 and the elapsed time t _F from the start of cutting of the current batch to the present time. The difference between this product and the current weight value W of the current batch measured by the weighing hopper 4 is calculated, and this is output as the raw material loading amount W _R of BC3. The cutting stop control unit 14 inputs the weighing target value designation signal _S2 from the control panel,
Weighing target value W specified by weighing target value designation signal _{S2 TGT} and weighing value W measured by weighing hopper 4
This is the weighed remaining amount value W _S , and the difference between this weighed remaining amount value W _S and the raw material loading amount W _R calculated by the raw material loading amount calculation unit 13 on the BC is W _S − W _R ≦C(C
is a negative predetermined amount), a cutting stop signal _S3 is output to the cutting device to stop the cutting device. Note that C is a safety constant to prevent an error in the raw material loading amount W _R on BC3 due to variations in the cutting speed, and to prevent the cutting amount from being insufficient.

Next, the operation of this embodiment will be explained.

A cutting device designation signal _S1 specifying a cutting device corresponding to a desired brand of coke is input to the cutting speed calculation section 12, and a weighing target value designation signal _S2 is input to the cutting stop control section 14. Then, the cutting device is designated and the weighing target value W _TGT is set. First, the cutting speed calculating section 12 calculates the cutting speed specified by the cutting device designation signal S ₁ , which is determined from the weighing speed υ _W calculated by the weighing speed calculating section 11 at the end of each batch and is stored internally. The average of the estimated values for the past several batches of the extraction device is taken and output as the cutting speed υ _F of the current batch. Next, the signal indicating this cutting speed υ _F is
It is input to the BC upper raw material load calculation unit 13,
The above raw material loading amount W _R is calculated every moment, and a signal indicating this raw material loading amount W _R is input to the cut-out stop control section 14. The cutting-out stop control unit 14 calculates the remaining weighing amount W _S from the weighing target value W _TGT set by the weighing target value designation signal S ₂ and the weighing value W at the weighing hopper 4, and Weighing remaining amount value W _S and BC
When the difference W _S − W _R in the raw material loading amount W _R transmitted from the upper raw material loading amount calculation unit 13 becomes W _S − W _R ≦C, a cutting stop signal S ₃ is sent to the cutting device. Output.
This causes the cutting device to stop. In this way, when the weighing of the current batch is finished, the weighing speed υ _W of the current batch is calculated in the weighing speed calculation section 11,
A signal indicating this weighing speed υ _W is output from the cutting speed calculation unit 1.
2, an estimated value of the cutting speed of the cutting device designated by the cutting device designation signal _S1 is obtained, and this estimated value is stored inside the cutting speed calculation unit 12 and used from now on. It is used to calculate the cutting speed υ _F in batches of .

In this way, since the cutting of coke is controlled while calculating the raw material loading amount W _R on BC3 from time to time, only a small amount of coke remains on BC3 when weighing is completed. Moreover, the safety constant C prevents the cutting amount from becoming insufficient and not reaching the weighing target value W _TGT . Therefore, the cutting amount will not be insufficient than the weighing target value, and the weighing hopper 4
The amount of coke from the previous batch mixed in is small.

[Effects of the Invention] As explained above, according to the present invention, even if the amount of coke remaining on the BC3 at the end of a batch is small and the coke brand of the previous batch and the coke brand of the current batch are different, The amount of different brands of coke mixed in the weighed coke is small, so the neutron moisture meter 8 can be used to accurately measure the moisture content of this batch of coke brands, and the necessary It is possible to weigh accurately including the dry weight value, and furthermore, it is possible to charge coke with the same particle size in each batch into the furnace, which maintains a good gas flow distribution in the furnace and improves operational performance. It has the effect of

[Brief explanation of drawings]

FIG. 1 is a block diagram of a blast furnace coke cutting 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. 1 ₁ to 1 ₄ ... carcass storage tank, 2 ₁ to 2 ₄ ... cutting device,
3...Belt conveyor, 4...Weighing hopper, 5,
6,7...Coke, 8...Neutron moisture meter, 11
... Weighing speed calculation section, 12 ... Cutting speed calculation section,
13... BC raw material loading amount calculation unit, 14... Cutting stop control unit, W... weighing value, W _R ... raw material loading amount,
W _TGT ...Weighing target value, υ _W ...Weighing speed, υ _F ...
Cutting speed, S ₁ ... Cutting device designation signal, S ₂ ... Weighing target value designation signal, S ₃ ... Cutting stop signal.

Claims (1)

[Claims] 1. In 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, Coke loading on the belt conveyor is determined based on the product of the average value of the cutting speed calculated from the weighing speed for each batch of multiple times up to and the elapsed time from the start of cutting to the present time, and the current weighing value of the weighing hopper. a raw material loading amount calculating means for calculating the amount, and a coke loading amount calculated by this raw material loading amount calculating means from the weighed remaining amount value with respect to the weighing target value, and when the result of this subtraction becomes a negative predetermined amount or less. A blast furnace coke cutting control device comprising a cutting stop control means for outputting a cutting stop signal to the cutting device.