TW201209172A - System and method for evaluating the slag revoming rate of a furnace - Google Patents

Abstract

A system and a method for evaluating the slag-removing rate of a furnace are disclosed. The furnace uses a water quenching equipment to convert the slag of the furnace into water quench slag, and the water quenching equipment uses water stored in a cooling water sink to cool the slag. The evaluating system includes a water temperature meter, a water flow rate meter, and a calculation module for calculating the slag-removing rate. A slag-removing rate equation is stored in the calculation module. In the evaluation method, at first, the water temperature meter is used to measure the temperature of the water flowing to the water quenching equipment from the cooling water sink. Thereafter, the water flow rate meter is used to measure the flow rate of the water flowing to the water quenching equipment from the cooling water sink. Then, the calculation module is used to calculate the slag-removing rate of the furnace in accordance with the measured flow rate and temperature, and the slag-removing rate equation.

Description

201209172 VI. Description of the invention: [Technical field of invention] The present invention relates to a blast furnace slag flow estimation system and estimation method. [Prior Art] In the current blast furnace ironmaking technology, slag discharge is a Important indicators. The slag discharge flow rate of the blast furnace is used to estimate the amount of slag in the blast furnace. The molten iron level can be used to further know the liquid level of the hearth, which is of great help to the stable operation of the blast furnace. At present, most of the slag discharge flow rate of the blast furnace is estimated by the water quenching furnace stone discharge rate of the water quenching equipment, and the water quenching furnace stone discharge rate of the water quenching equipment is the oil pressure of the calculus through the dewatering drum after the granulation tank The change is estimated. However, since the calculus entering the granulating tank will be mixed before the tank is mixed and then discharged, the calculated calcining amount is not equal to the instantaneous entering weight, so that accurate grit data cannot be obtained immediately. SUMMARY OF THE INVENTION Accordingly, it is an aspect of the present invention to provide a coke oven slag flow estimation system and an estimation method for instantaneously obtaining accurate slag discharge. According to an embodiment of the present invention, the blast furnace slag flow estimating system is configured to estimate a slag discharge flow rate of the blast furnace, wherein the blast furnace uses a water quenching device to convert the slag of the blast furnace into a water quenching furnace stone, and the water The quenching equipment uses the water in the cooling water storage tank to cool the furnace. The blast furnace discharge flow estimation system includes a water temperature measuring device, a water flow measuring device, and a slag flow calculating module. Water f 4 201209172 : Water in the cooling water storage tank flowing into the water quenching equipment: storage water temperature (4) ° water flow measuring device is used to measure the water flow from the cooling water storage tank Water flow data. The calculation module is used to calculate the value of the slag discharge flow based on the measured water temperature data, water flow data and the following equation: peach ~Τ^~Ψ^{ΤΧ -25) + 1.14^(Γ,^)

Where Ms is the slag discharge flow; Μι is the above measured water flow rate (kg small Tl is the temperature of the water flowing from the water quenching device to the cooling water storage tank; 21 measured water temperature; ql is the heat loss; Ss is The heat of the (four) is a heat of the slag (Celsius 沱); Ww is the water content of the water quenching furnace (%); Sw is the specific heat of water. According to another embodiment of the present invention, The foregoing blast furnace flow estimation method estimates the flow rate of the blast furnace (four), wherein the blast furnace uses water quenching equipment to convert the slag of the furnace into blast furnace, and the water quenching equipment uses the water in the cooling water storage tank. Cooling slag. In the blast furnace slag flow estimation method, the water temperature of the water flowing from the cooling water storage tank to the water quenching equipment is first measured to obtain the water temperature data. Then, the measurement is performed from the cooling water storage tank to the water quenching. Set the water flow rate of the injured water to obtain the water flow data. Then, calculate the value of the slag discharge flow based on the water temperature data, the water flow data, and the following equation:

Ms=__1·14Μ,(Γ, -T2) + Ql_ ^s(Ts ^^\)^V/[VS}v(T] —25)+ 1.14^(Γ, — Γ2) where Ms is row> Check the flow rate; Μ1 is the above measured water flow rate (kg)] Τ 攸 is the temperature production of the water flowing into the cooling water storage tank of the 攸水泮设备· Τ2 is the water temperature measured above; ql is the heat loss; Ss The specific heat of the slag (仟卡/公斤.c); the temperature of the slag (Celsius.c); Ww is the water quenching furnace 201209172 Moisture content (%); sw is the specific heat of water [Embodiment] f Reference FIG. 1 is a flow chart showing a simulation calculation, a ten-calculation system, a system 100, and a heat supply amount according to the present invention. The high modulus system 100 of the present embodiment calculates the model by the difference in the amount of slag cooling water. This gratestone flow calculation model can instantly calculate the flow reading amount for the blast furnace operator to monitor the grate level.备德=热Γ算线线为为拟炉(四)Inlet water quenching The heat exchanger system, in which the simulated heat quantity calculation system includes water = 110, condenser 120 * cooling water storage tank no. Water quenching equipment = used to convert blast furnace slag into water quenching furnace stone. It can be a large guaranteed 1NBA system. The cooling water storage tank 130 is for storing 1 : cooling water required for supplying the water quenching apparatus 110. The condenser is used to condense the evaporated water vapor emitted by the water 泮 equipment UG to facilitate calculation of the heat enthalpy of the evaporated water vapor. In the closed system composed of the water quenching apparatus 110, the condenser 120 and the cooling water storage tank 23, according to the principle of mass balance, the following formula can be obtained: M4+Ms=M5+(1 + ψ w) Ms > Μ4 =Μ5+Ψ wMs (1) where Μ» is the amount of replenished water in the cooling water storage tank i3〇 (kg/hr); is the slag flow rate (kg/hr); Ms is the cooling water storage tank 13〇 evaporation rate (kg/hr); The knowledge (9) is the water content (%) of the water quenching furnace. In the present embodiment, the water content measured by the blast furnace field is 6.64%. In the closed system of the water quenching apparatus 110, according to the principle of mass balance, 201209172 can be obtained to obtain the following formula: M1+Ms+M2, =Μ2+Μ3+(1 + Ψ w) Ms M3- Ψ w Ms (2) where ' Mi is the water quenching water flow rate (kg/hr); m2 is the water evaporation rate (kg/hr) in the water quenching process; M2' is the condensation rate of the condensation process (kg/hr); M3 is the water quenching equipment 110 flowing into the cooling water storage The water flow rate (kg/hr) of the tank 130.

In the closed system of the cooling water storage tank 130, the following equation can be obtained according to the mass balance principle: ^4+ M3 = Mi + M5 (3) Substituting equation (1) into equation (3), and equation (4) Substituting into equation (2), the following equation can be obtained: M1=M3+WwMs (4) M2: M2, (5) Then, in the simulated heat quantity calculation system 100, the following equation can be obtained according to the energy balance principle. :

S where S

MsSs*(Ts-25)+ M4Sw*(T0-25) = M$Ss*(Tr25)+ M5*[539+ (10)-25mMs*Sw*(Ti25)+QL (6) for the furnace 'check the specific heat ( Leica / kg. C); Sw is the specific heat of water; Ts ^ Celsius c); Ts is the temperature of collapse (Celsius. c); Tl is the temperature of the water of the 3 water and storage tank 230 of the water quenching equipment 21 (2) Celsius °C); QL is the whole system is 539, 'Car two is the temperature of the supplementary water; room temperature is 2rc of the evaporative heat Ϊ: 39 is the value of the parameter M5 in the process of pushing the two sides. Due to the evaporation of water to 5.39. (:, then ~f is 1, so if you want to water 1〇0 kg of water, 1 kg of water. According to this calculation, you can get it, 7 201209172 The following equation: M5*539 = M3*1*(Ti-T2 ^ M5 = M3*(Tl-T2)/539 (7) where h is the temperature (celsius jC) of the water flowing into the water quenching equipment 11 from the cooling water storage tank 130. The evaluated thermal energy is not included in the above calculation. , will be included in the heat loss Ql, so the heat loss ql is roughly equal to the heat loss of the water quenching equipment 11〇

Qi, the heat loss Q2 of the condenser 120 and the heat loss Q3 of the cooling water storage tank 13〇, wherein the heat loss 冷凝器 of the condenser 12〇 is a negative value. Then, the above equations are sorted to obtain a slag flow calculation model. It can be known from equation (4):

Μ3 = Μ] - Ψ WMS (ο) Substituting equations (7) and (8) into (6) gives:

Ms[Ss*(Ts-T1)^wsw*(Ti.25)]=

(Mj-Ψ wMs)*614*(TrT2)/539+ QL Finishing the above formula:

Ms=- l.HMjT; -r2) + 0,___

Ss(Ts-Τχ)-ψ^{Τλ -25) + U4^(7^) (9) In the present embodiment, the value of Ss (Ts _Ti) of the equation (9) represents the heat of the furnace before and after water quenching. The amount of change. To find this value, make the following estimates. First of all, after the blast furnace collapses, the slag and the molten iron temperature of the iron sluice channel are measured by the paper rod (including the thermocouple), and the average temperature of the molten iron is about 1498.6. The average slag temperature was 1487.6. ^ Next, according to the well-known literature (the theory of the surface furnace milling method, the relationship between the amount of blast furnace recorded and the temperature disclosed by Professor AD GGtlib's 'Tongguan translation', as shown in Figure 2 (4)' As a condition, the amount of heat before and after the job is changed to 450 / / kg. In addition, the value of the heat loss ql is equal to KL*Minv, where Kl is the number of heat loss entries 201209172. In the case of the 杳 杳 量 施 施 施 施 施 施 量 量 量 量 量 量 量 量 量 量 量 量 量 量 量 累 累 传热 传热 传热 传热 传热 传热 传热 传热 传热 传热 传热 传热 传热 传热 传热 传热 传热 传热Loss parameter. As shown in Figure 3, the total amount of theoretical slag is not affected by the influence of the i = parameter value, so different heat loss parameters are substituted into @1(9)' and the measured and measured Calculate the total amount of slag and the different values. These calculated values form a straight line and the heat loss parameter value corresponding to the straight line of the theoretical slag total, and the parent point is the value of the heat loss parameter sought. As can be seen from the description, after the values of the parameters KL, Ww, sw, and SsOWO are determined, according to the equation (9), the temperature τ of the water that can be flowed into the cooling water storage tank 230 by the water quenching device 210, and the cooling water storage tank 13〇 The temperature h of the water flowing into the water quenching apparatus no and the water flow rate from the cooling water storage tank 23 into the water quenching β and 210 are obtained to obtain the slag flow rate ms. Further, the temperature of the water flowing into the cooling water storage tank 230 by the water quenching apparatus 210 is constant. Therefore, when the temperature T! is known (measured in advance), the slag flow rate can be calculated by knowing the values of τ2 and Μι. Ms. Please refer to FIG. 4 and FIG. 5 at the same time. FIG. 4 is a diagram showing a method for estimating the slag flow rate of the blast furnace according to an embodiment of the present invention. FIG. 5 is a diagram showing a method for estimating the slag flow rate of the blast furnace. A functional block diagram of the corresponding blast furnace slag flow estimation system 500. The blast furnace slag flow estimating system 5 〇〇 includes a water temperature measuring device 510, a water flow measuring device 52〇, and a slag flow calculating module 530, wherein the water temperature measuring device 510 is configured to measure the cooling water storage tank 550. The temperature of the water flowing into the water quenching apparatus 540 (i.e., the aforementioned τ2); the water flow measuring device 520 is for measuring the flow rate of water flowing from the cooling water storage tank 55 into the water quenching apparatus 540; the slag flow calculating module 53〇 The equation (9) described above is stored to calculate the flow rate of the blast furnace 56 根据 according to the measured water temperature and water flow rate. In this embodiment, the slag flow calculation module 53 includes a data receiving module and a computing module, and the data receiving module is configured to receive the measured water flow data and water temperature data, and the computing module is based on the memory. The calculation of the molding is performed to calculate the slag flow value of the furnace 560. The slag flow calculation module 530 of the present embodiment can be designed in a program-controlled computer of a blast furnace to facilitate automatic control of the operation of the blast furnace. In the blast furnace slag flow estimation method 400, step 410 is first performed to measure the temperature of the water that the water quenching apparatus 540 flows into the cooling water storage tank 550. Next, step 420 is performed to measure the flow rate of water flowing from the cooling water storage tank 55 into the water quenching apparatus 540. Then, step 430 is performed to calculate the slag flow rate based on the water temperature, water flow rate, and slag discharge flow equation (9) measured in steps 410 and 420. It is to be noted that in other embodiments of the present invention, a correction step of the heat loss parameter KL may be added to increase the accuracy of the slag flow rate calculated by equation (9). For example, if the program-controlled computer updates the heat loss parameter KL ’ every six months, before proceeding to step 430, the program-controlled computer will first check whether the current thermal parameter KL has exceeded the preset usage period (ie, half a year). If the result of the check is YES, the correction step of the heat loss parameter k1 is performed first, and then step 430 is performed. If the result of the check is no, proceed to step 430. In addition, it is noted that the above embodiments may utilize a computer program product to implement 'which may include machine readable media storing a plurality of instructions'. The instructions may be programmed to perform the computer in the above embodiment. step. The machine readable medium can be, but is not limited to, a floppy disk, a CD, a CD-ROM, a magneto-optical disk, a read-only memory, a random access memory, an erasable programmable read only memory (EPROM), or an electronic Erasable programmable read only memory (EEPROM), optical card or magnetic card, flash memory 35 201209172, or any machine readable medium suitable for storing electronic instructions. Furthermore, embodiments of the present invention can also be downloaded as a computer program product that can be transferred from a remote computer to a requesting computer by using a data signal of a communication connection (e.g., a connection such as a network connection). While the invention has been described above in terms of several embodiments, it is not intended to limit the scope of the invention, and the invention may be practiced in various embodiments without departing from the spirit and scope of the invention. The scope of protection of the present invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, and advantages of the present invention will become more apparent and understood. The figure shows a simulation heat quantity calculation system and a heat quantity calculation flow according to an embodiment of the present invention. Figure 2 shows the relationship between the enthalpy of blast furnace slag and temperature. Figure 3 is a plot of the total amount of theoretical stains and the calculated total slag versus heat loss parameters. Fig. 4 is a view showing a method for estimating a slag discharge flow rate according to an embodiment of the present invention. Figure 5 is a functional block diagram showing the blast furnace slag flow estimation system. [Description of Main Component Symbols] 201209172 100: Simulated Heat Mass Calculation System 110: Water Quenching Apparatus 120: Condenser 130: Cooling Water Storage Tank 400: Blast Furnace Slag Flow Estimation Method 410: Step 420: Step 430: Step 500: Blast Furnace Slag Flow Estimation System 510: Water Temperature Measurer 520: Water Flow Measurer 530: Collapse Flow Calculation Module 540: Water Quenching Apparatus 550: Cooling Water Storage Tank 560: Blast Furnace: Water Quenching Water Flow M2: Water Evaporation rate of quenching process M2 ' : Condensation rate of condensation process M3 : Water flow rate M4 : Replenishment water volume M5 : Moisture evaporation rate Ms : Slag flow rate T 〇. Water temperature T1 · Water temperature T 2 . Water temperature T s ·〉 Temperature Ql, Ql, Q2, Q3: heat loss ¥w: water quenching furnace water content

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Claims (1)

201209172 VII. Patent application scope: 1. A blast furnace slag flow estimation system for estimating a slag flow in a blast furnace, wherein § Haishang furnace uses a water quenching device to convert one slag of the blast furnace The water quenching furnace stone is cooled by the water in a cooling water storage tank, and the blast furnace slag flow estimating system comprises: a water temperature measuring device for measuring the The cooling water storage tank flows into the water temperature of one of the water of the water quenching device to obtain a water temperature data; a water flow summer measuring device for measuring a water flow rate of water flowing from the cooling water storage tank to the water quenching device to obtain a water flow data; and a slag flow calculation module comprising: a receiving module for receiving the water temperature data and the water flow data; and a juice calculation module for calculating the value of the slag discharge flow according to the water temperature data, the water flow data, and the following equation: -JilM.cr, ~t2)+ql ss(Ts-Τλ)-Ψίν3ΛΤχ -25) + 1.14^(7,-τ2) where Ms is the slag flow rate; Μι is the water flow rate (kg/field jin), Τι is the water from the water quenching device flowing into the cooling water storage tank for the 7jc temperature; ~ is the heat loss; ^ is the specific heat of the furnace collapse (仟檐^8/) · 'Where the temperature of the slag (Celsius c); water quenching furnace water content (%); sw is the specific heat of water. System, blast furnace slag flow _ [S 13 201209172 Such as Shen Yi patent I 巳 帛! According to the item, the blast furnace discharge flow rate is estimated, and the middle SsWD system represents the change of the heat supply amount before and after the water quenching, and the value of the heat enthalpy change is 450 (leica/kg). 4. The blast furnace money evaluation estimating system according to claim 1, wherein the temperature of the water flowing into the cooling water storage tank from the water mitigation device is fixed. w 5. A method for estimating the slag discharge flow rate of a blast furnace for estimating a slag discharge flow rate of a blast furnace, the blast furnace slag water quenching device is converted into a blast furnace, and the water quenching The device uses a water in a cooling water storage tank to cool the slag. The blast furnace slag flow estimating method comprises: 9 measuring a water temperature of the water flowing from the cooling water storage tank into the water quenching device to obtain a Water temperature data: measuring a water flow rate of water flowing into the water quenching device from the cooling water storage tank to obtain a water flow data; and calculating the row according to the water temperature data, the water flow data, and the following equation The value of the slag flow rate: Ms=__1.14Μ, (Γ, -T2) + Ql__ where Ms is the slag discharge flow rate; M〗 is the water flow rate (kg/hour) · τ〗 is the flow from the water quenching device to the cooling The temperature of the water in the water storage tank; τ is the water temperature; ql is the heat loss; ss is the specific heat of the slag (仟卡/kg.c) · ^ is the temperature of the slag (Celsius C); Ww is the water quenching Hearth water content (% 'ss is the specific heat of water. ' w S] 14 201209172, 6. If you apply for The method for estimating the slag discharge flow rate of the blast furnace according to the fifth item, wherein the water content of the water quenching furnace is 6 64%. 7. The method for estimating the slag discharge flow rate according to the fifth item of the patent application scope , wherein Ss*(Ts-T〇 represents a change in the amount of heat enthalpy of the slag before and after water quenching, and the value of the change in the amount of heat enthalpy is 450 (leica/kg). ', 8. 5 blast furnace (4) flow estimation method • The temperature of the water flowing into the cooling water storage tank from the water quenching equipment is depreciated. 9. The blast furnace slag flow rate estimation mentioned in item 5 of the patent scope The value of the square sister's damage (QL) is directly proportional to the heat loss parameter. The blast furnace check flow estimation method further includes a parameter correction step to correct the heat loss parameter according to a theoretical total slag. h 凊 凊 凊 凊 凊 第 第 第 第 第 第 第 第 第 第 第 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高 高And when the time exceeds the preset use period, the heat loss is performed 15