JPS6071685A - Method for controlling combustion of fuel gas in coke oven - Google Patents

Abstract

PURPOSE:To keep the input heat quantity and the flow rate of mixed gas in a coke oven to a respective preset levels by setting the heat quantity to be inputted, detecting the heat quantity of the supplied fuel gas, and controlling the input heat quantity so as to equalize both head quantities. CONSTITUTION:The heat quantity to be inputted to a coke oven is preset to a desired level, and the heat quantities of the blast furnace gas and the coke oven gas supplied to the coke oven are detected. The combustion of the fuel gas in the coke oven can be controlled by controlling the heat quantity supplied by the blast furnace gas and/or coke oven gas to the coke oven so as to attain the inputted heat quantity stably to a level almost equal to the preset heat quantity according to the preset heat quantity and the heat quantities of the fuel gases.

Description

[Detailed description of the invention] This is related to the first method of production.

Generally, a coke oven has a carbonization chamber 1 as shown in FIG.
A large number of flues (combustion chambers) 2 for heating are arranged alternately to form h11, raw coal is sequentially charged into each carbonization chamber 1 through its coal charging port 3, and in each flue 2 a furnace (combustion chamber) is charged. Coal is carbonized to produce coke by burning the fuel gas supplied through the gas tank 4 and heating each carbonization chamber 1 with flues 2 on both sides.In each carbonization chamber 1, carbonization The by-product residue generated therein passes through the riser pipe 5, is collected in the dry main 6, and is sent to a by-product processing plant.

The slag used in coke ovens includes blast furnace scum (BFG) and coke oven gas (COG) generated within the Le 4 ironworks. A mixed gas of these is used for 'r:'+. As shown in FIG. 2, these BFG and COG are drawn from the BFG main pipe 7 and COG main pipe 8, respectively, mixed in a mixing gas pipe 9, and branched from this mixed gas pipe 9 in correspondence to each flue 2. fuel waste 1
12'v4 is supplied to each flue 2 in red and burned. crucian carp! 8 The waste residue after firing is drawn down from each flue 2 through the heat storage chamber to a small flue 10 at the bottom of the heat storage chamber, collected in the flue 11, and guided from the flue 11 to the chimney 12 and discharged into the atmosphere. Ru.

In such coke oven operation, in order to ensure stable coke production, it is necessary to maintain the flue temperature at a constant value of 0. It is necessary to keep I'Kca/Kha] at a constant value. Here, input heat amount E
is the calorific value of the mixed waste Q y, CKcalAma)
m gas mixture VM CNm'3/h) Torto,
E = Q M -V y, (Kcaj/h) ・-
(Represented as 1,1〇 Therefore, conventionally, as shown in Fig. 3, the BFG flow gl drawn from the BFG main pipe 7 and the O drawn from the OOG main pipe 8
The flow rate of OG is detected by the flow rate sensors 13 and 14, respectively, and the flow rate ratio
OOG via fiij device 16 device upper 6 flow rate control valve 17
While controlling the flow rate, the flow rate sensor 18 in the mixed gas pipe 9 detects the mixed waste flowing upstream l, so that the mixed gas flow rate becomes the desired hot rice VM set by the mixed waste flow manual setting device 19. The mixed gas flow rate is controlled by the MP controller 20 via the flow rate control valve 21.

However, the heat generation h of BFG and the heat generation of 00G)17 are not constant as shown by QB and Qc in Fig. 4, respectively, and QB is approximately 600 to 750 (KcalAma
), Qc is approximately 4000-4500CKCaj/I
RF
When the flow J1 ratio of C and COG is controlled to a set value r, the mixed waste calorific value QM fluctuates, and on the other hand, the mixed waste b1. Since the combustion is constant at the set value VM, the input heat jjIE expressed by equation 11 above will fluctuate with the fluctuation of QM. Therefore, in the conventional combustion control method, Conceive the momentum of QM and input M 11
The flow rate I and the mixed gas flow rate VM are set so that E is greater than the heart rate, thereby ensuring the lowest furnace temperature. For this reason, there are many cases where there is no energy consumption.
In addition, even if a hi-low furnace temperature is ensured, fluctuations in furnace temperature will affect coke quality and cause variations in carbonization time.
Operations were also unstable.

In order to solve this problem, a combustion control device as shown in FIG. 5 has been proposed. Instead of setting the flow rate ratio r of BFG and COG, this combustion and restraint device 1 sets the desired mixed gas calorific value Q and M using the mixed gas heat generation threat manual setting residue 22, and also sets the desired mixed gas calorific value Q and M of BFG and COG. The heat generation QB and QG are detected by the calorie meters 23 and 24, respectively, and the set heat generation amount QM
Based on the detected heat generation kIIQB, QG, the flow rate ratio r is calculated by the calculator 25, and the flow rate ratio r, Ii stagnation device 16 and flow: heat, iA 3r+valve 1 are determined.
By changing the COG flow 1r'k to hilJω(1) through 7, the calorific value of the mixed sludge is always set to Qhx, and is similar to other lII1 or the one in Fig. be.

That is, in this fuel %f, control device +6, BF
If G flow 1i1V43 and G OG flow jii are VC, then V B +V C= VM (Nm8/h)
−(21QBVB+Q(HV=QMVM(Kcaj
/Nm8) - (31 forces were established, fAi h'i ratio 7
From equations (21 and (3)), (-VC/VB) is expressed as: Based on the heat generation 1'j5QBrQG detected at a total of 22.23 cuffs, the flow rate ratio l is successively calculated using the formula (4+), and the flow rate ratio: Jir clause is adjusted so that the calculated chick f0 ratio r is obtained. Fuku 16 and flow 47i, -14
By feeding the GOG flow iii through the negative I valve 17 during flipζ, the mixed sludge heat generation 11 is reduced to the set value QM.
1 lil + wholesale.

In addition, the mixed waste flow rate is always set by the mixed waste flow ↓I (manual construction force h11) ((IV
1. i, 1/if ′Lij :, (
f71'l vessel 20 and Ul'lr b, j', ii
fulj tl+ via '+1 clause 1-21.

In this way, according to the jli-iJ system shown in FIG. I lII
Therefore, the input (transformation) yftE represented by their product is always constant. There is.

That is, in coke oven operation, coking Mf
It is necessary to change the input heat amount E in response to changes in coke oven heat load due to changes in e and changes in the moisture content of charged coal. In this case, in Fig. 5, it is only necessary to change the setting of either or both of the mixed gas calorific value QM and the mixed gas flow VM, but the mixed gas calorific value i QM is the BFG calorific value QB and the COG light thermal iM described above. Since the settable range, that is, the degree of freedom in setting QM changes over time in response to fluctuations in QQ, it is difficult to use as a setting constant, and this is handled by changing the setting of the mixed waste flow l1iV M. However, the mixed waste sitt + tie is determined by the coke temperature to be the optimal flow h1, and if this limit range is exceeded, the temperature distribution in the flue becomes unbalanced, which has a negative impact on the fire-off time and coke quality. The mixed gas flow rate V
If only the setting of M is changed, the change range of the amount of input heat E is extremely narrow, and the desired input heat 1+t may not be obtained.

An object of the present invention is to solve the above-mentioned problems, and to make it possible to change the input heat amount over a wide range, and to make it possible to change the input heat amount over a wide range.
yi - It is an object of the present invention to provide a method for stably burning fuel scum in a coke oven.

The burn-in-one control method of the present invention sets a specific amount of heat input to the coke oven, and also sets the amount of heat input to the coke oven.
The heat generation 811 of each fuel scum of the The main feature is to control the feed flow b(ml+) of the BFG and/or OOG to the coke oven.

That is, in the present invention, the input heat Ili:E is used as the lung θ1] parameter in place of the above-mentioned RFC and OOG flow rate ratio r and mixed gas calorific value QM, and the set input heat is approximately equal to E. The flow of BFG and/or COG is controlled so that a stable heat flow is always obtained.

Here, the benevolence vB and VC of the BFG and OOG to be controlled are
By eliminating M, it is possible to combine MQO-E, and substitute vB or vc, which is related to equation (5) or (6), into equation (21) to obtain VQ or vB, VQ=Vl-VB...・(7) V B ” V M −V C...(8) can be intertwined.

Flil the vB and/or vc that you have created in this way.
BFG and/or SoG fA as a J-campaign target
By controlling ε, it is possible to maintain the mixed waste flow vM at an appropriate value for the coke oven, while keeping the official heat I (not always set to 51) to the value E. Therefore, the coke The furnace temperature is stabilized and fluctuations in the temperature distribution inside the furnace are suppressed, resulting in significant effects such as stabilization of energy-saving operations and improved coke quality.In addition, the control range of VB and/or VQ is relatively wide. Therefore, the setting range of the input heat jig H can be widened.In addition, the mixed gas flow f4 (VM is the number of carbonized silkworms handled by the present inventors, 6
6. Coke production capacity at 100% operation: 4500
0) 500'00 Nm8 in a coke oven at about 1000 Nm/month
/h is optimal, but this v B (is optimally allowable fi
Since it can be changed within flood p1(, this allows the setting of input heat ↓i(E) to be made wider.

Hereinafter, with reference to the drawings, the fuel 93tl Flill of the present invention will be explained.
A specific example of the combustion 1filJ sub-device which is the actual sister of the 1i (11 method) will be explained.

Figure 6 shows a combustion engine 11i11 f++ that implements the method of the present invention.
This shows an example of 41:1 configuration of 1 device 1 no 1. In this example, the heat generation of BFG drawn from BFG main pipe 7 and COG drawn from OOG main pipe 8 is ii′Q 13 and Qa
are detected by the calorie meters 23 and 24, respectively, and the flow (j
The input heat f, 3 F and the mixed gas flow 1i-4 set in 27 are supplied to the I control calculator 26 and calculated in column 72e with these calorific values QB, QG and setting 8i;
Based on VM, the above (51 and (6) formula, or (5) and (7) formula, or (6) formula and (8)
The control target value vB for the BFG flow rate and GOG flow left is determined by the formula.
and vc respectively? IIJ7;l: Then, B
FG flow rate and OOG flow rate are independently controlled by 6v to target values vB and Vc, respectively. For this reason, the sweat flow of the BFG is detected by the flow rate J11 sensor 13, and the flow rate and the target value vB from the flow rate control 1 calculator 26 are compared and precalculated by the flow rate regulator 28, and based on the output. The BFG flow set is controlled via the flow control valve 29 so that both are equal, and
Similarly, the COG flow 1IjJ is detected by the flow hi sensor 14, and the flow tf1 and the target value V(
3 and 3 are adjusted to flow h-(comparison value t> by the regulator 30, and based on the output thereof, the COG flow is controlled via the B4 control valve 17 so that both flows are equal to η.

On the other hand, the setting device 27 includes an operating rate setting device and a coal moisture M1.
Alternatively, data on the operating rate and the moisture content of charged coal is supplied from an external device 31 having a coal moisture setting device, and
The output of a temperature sensor 32 installed in the flue 2 is supplied. The setting device 27 calculates the required input thermal power ↓E from these input data.
The output TJ,L is supplied to the flow rate IJ calculation unit 26. Note that the mixed waste i =, V yl is set to the optimum value for the coke oven in the setting device 27 and is supplied to the flow rate production 1 computing unit 26.

Book [flJ Ni, J:hLt, B F G style tit B
J: HOOG m m, each style (1) self-control l
BFG fever 'MQB, GOG in fiiH calculator 26
Fever? fi: Q c, the system based on the required input heat 9rEi6 and the optimal 1 slag flow rate ■λ1? ++a f
ili! independently of the standard values vB and VQ. I fh+, so the actual input heat; and the photocombination scum m
It is possible to maintain constant values of E and VM at the respective set values E and VM, and also to change the setting of the required input heat and E while maintaining the optimum volume range of the mixed waste flow section.
It can be made into υJ1.

Figure 7 shows combustion that implements the method of the present invention! filJ tiU
2 shows another example of the hr+ configuration of the device if-; In this example, the COG flow jj', '+IIU ml is the 6th
The process is carried out in the same manner as in the case shown in the figure, but the BFC flow is not controlled; instead, in the mixing waste pipe 9, the mixed waste flow h1 is adjusted to the optimum value VM set by the setting device 27.
r control. For this reason, the flow rate of the mixed scum is detected by the flow rate sensor 18 in Mixed dregs danger 9, and the flow rate and the set value VM are compared and calculated by the Meteor controller 20, and based on the output, the two are made equal. Then, the temperature of the mixed gas is controlled via the flow control valve 21.

That is, in this example, the OOG flow Hi is determined by the control σ! obtained from the above equation (6). By controlling to the target value vc, the mixed gas heat generation in the mixed gas 'i7f9 is
is maintained constant at a value corresponding to the set value E and VM, and in this state, the mixed waste flow rate is controlled to the set value VM. Therefore, in this example as well, as in the case of Fig. 6, the input heat amount and the mixed gas flow rate can be maintained constant at the set values E and VM and m, respectively, and the heat generation of GOG is much more cylindrical than that of BFG. Therefore, since the control range of vA+ can be set extremely wide, the setting of the required input heat amount E can be changed over a wide range.

FIG. 8 shows the configuration of still another example of a combustion control device implementing the method of the present invention. In this example, the 00G flow 111 suppression is performed in the same manner as in FIGS. 6 and 7, but the BFG flow rate control is not performed, and instead the BFG
The flow rate hi' is detected by the flow rate sensor 13, and the deviation between the detected flow rate and the BFC flow control target value vB calculated by the flow rate control calculator 26 is calculated by the calculator 26,
Based on the deviation, the flow rate is calculated as 4 negative j unit 20 and the flow rate π! J
The mixing force flow rate is controlled to a set value VM via the m valve 21.

That is, in this example, by controlling the COG flow rate to the control target value v (3) obtained from the above equation (6), the mixed waste source heat fr (Q M in the mixed waste pipe 9 is set to the set value E and VM, In that state, the mixed waste flow is maintained at a constant value (instead of ejecting, the flow
In 6, flow i! The deviation between the BFG dispersion from the l sensor 13 and the BFG flow starvation feeding control 1 target value vB determined by the above equation (5) or (8) is calculated, and based on this deviation, the flow rate is changed from the flow rate to the moderator 20. And the flow rate -1゛The mixed gas flow rate is set to the set value VM via the 4-node valve 21! 1JII control.

Therefore, in this example as well, the same effect as in the case of FIG. 7 can be obtained.

It should be noted that the present invention is not limited to the above-mentioned example, and many modifications and variations are possible.

For example, in FIGS. 6 to 8, the required input heat amount E is automatically set by calculating it from the flue temperature, operation rate, and charging coal moisture content in the setting device 27. , may be set manually. Further, the mixed gas flow rate vM may not be uniformly set to the optimum value in the setting device 27, but may be changed within the optimum allowable range according to the friendliness of the input heat filE. Furthermore, in FIGS. 7 and 8, the OOG flow I is controlled to the ω11 target value VQ by +1, but even if the BFG flow is generally controlled to the ω11 target value vB. good.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the configuration of the main parts of a coke oven, Fig. 2 is a diagram showing the fuel gas supply line and the exhaust nose exhaust line, and Fig. 3 is a diagram showing the conventional combustion section 1fjl equipment. A diagram showing the structure of the
Figure 4 is a diagram showing the variation in heat generation 1° of BFG and OOG. Figure 5 is a diagram showing another configuration of the conventional combustion restraint system Wj.
FIG. 1, FIG. 6, FIG. 7, and FIG. 8 are diagrams each showing the configuration of a combustor subsystem for carrying out the method of the present invention. 2...Flue 4...Fuel waste pipe 7...BF
G main pipe 8...OOG main pipe 9...Mixed gas pipe ],
, 3, 14□, 18...flow h (sensor 17.21.2
9... Flowing claw cylinder valve 20, 28.30... iAl+
'ii' + Seiseki 23.24-h o Lee-total 26-
...Flow*4' 1171j (all 1m r' i
+27... Setting device 81... -32... to external housing
Humidity sensor. Patent applicant Kawatetsu Kagaku Co., Ltd. Representative Patent Attorney Hideto Sugimura Akatsuki Patent Attorney Oki Sugimura Figure 1 Broom 2 Figure 3 Rei 4 Figure 5 LS Figure 6 Broom Figure 7? ;581ne1

Claims (1)

[Claims] 1 Set the desired input heat m to the coke oven,
The heat generation (it) of each of the blast furnace gas and coke oven gas fuel gas supplied to the coke oven is detected, and based on these set input heat f + t and the calorific value of each fuel gas, the input heat amount is approximately equal to the set input heat amount. 1. A method for controlling fuel combustion in a coke oven, which comprises controlling the flow rate of blast furnace gas and/or coke oven scum to the coke oven by mJ so that a stable amount of heat can be obtained.