Automatic heating control system of coke oven

Abstract

The invention discloses an automatic heating control system for a coke oven, and particularly relates to the technical field of coke oven control, and the system comprises a raw gas temperature measurement module which is used for obtaining real-time temperature data of raw gas in a coke oven system; the vertical flue temperature module is used for acquiring temperature data in a vertical flue; the coal gas flow control unit is used for automatically adjusting the heating coal gas flow according to the temperature data in the vertical flue; the branch flue control unit is used for controlling the suction force in the branch flue according to the flow of the heating coal gas; and the multi-mode fuzzy control unit is used for controlling the temperature in the coke oven by using multi-mode fuzzy control according to the vertical flue temperature data and the raw gas temperature data. According to the invention, the temperature data in the coke oven is fully automatically acquired and captured, so that the temperature in the coke oven can be effectively controlled, automatically collected and automatically adjusted, the temperature fluctuation in the coke oven is small, the temperature is more stable, the timeliness and accuracy of the temperature management of the coke oven are improved, and the labor intensity of workers is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of coke oven control, and more specifically, to a coke oven automatic heating control system. Background Art

[0002] The temperature control system of the vertical fire channel of the coke oven is a typical system with large inertia, nonlinearity, and time-varying characteristic parameters. In the production process, it is often disturbed by factors such as delayed coke pushing, changing coking time, and fluctuations in the moisture content of the coal in the furnace. Therefore, it is difficult to ensure the stability of the furnace temperature by using conventional PID control. According to production requirements, the fluctuation of the furnace temperature should be within the range of ±7℃ of the standard temperature, but in actual production, under greater interference, the fluctuation of the furnace temperature often exceeds the range of ±7℃. In view of this feature of the coke oven, it is more appropriate to use a fuzzy control algorithm, but ordinary fuzzy algorithms also have their shortcomings. If the quantization level of the fuzzy input / output is divided too finely, the fuzzy control rules become very complicated. If it is divided too roughly, it is difficult to meet the requirements of control accuracy. Summary of the invention

[0003] To achieve the above object, the present invention provides the following technical solution: a coke oven automatic heating control system, comprising:

[0004] Raw gas temperature measurement module, used to obtain real-time temperature data of raw gas in the coke oven system;

[0005] The vertical fire channel temperature module is used to obtain the temperature data in the vertical fire channel;

[0006] The gas flow control unit automatically adjusts the heating gas flow according to the temperature data in the vertical fire channel;

[0007] The sub-smoke duct control unit controls the suction force in the sub-smoke duct according to the heating gas flow rate;

[0008] The multi-mode fuzzy control unit controls the temperature inside the coke oven using multi-mode fuzzy control according to the vertical fire channel temperature data and the raw gas temperature data.

[0009] In a preferred embodiment, a feedforward control model for suction of the sub-ducts is established according to the suction data in the sub-ducts, and then the feedforward control model is corrected according to the oxygen content data of zirconium oxide.

[0010] In a preferred embodiment, a mode combining forward and feedback control is adopted, the suction of the sub-flue is feedforward adjusted according to the feedforward control model and the change of the heating gas flow rate, and then the suction target value is feedback adjusted and corrected according to the residual oxygen content in the sub-flue.

[0011] In a preferred embodiment, the raw gas temperature measurement module includes a K-type thermocouple installed at the coke oven bridge pipe position, and a GH3039 special high-temperature resistant steel casing is added to the outside of the K-type thermocouple.

[0012] In a preferred embodiment, the vertical fire channel temperature module includes an optical lens installed at the end of the air blowing pipe, an optical fiber placed in a stainless steel double-layer bridge frame, and a photoelectric conversion instrument installed on the furnace table or end table. The optical fiber is a double quartz infrared conduction optical fiber with a core diameter of 0.2 mm.

[0013] In a preferred embodiment, the gas flow control unit includes a valve for controlling the gas flow, and the gas flow is controlled according to the vertical fire channel temperature data.

[0014] In a preferred embodiment, the sub-smoke duct control unit adjusts the suction force in the sub-smoke duct by controlling the opening of the inner flap of the sub-smoke duct.

[0015] In a preferred embodiment, the multi-mode module control unit controls the vertical flue temperature of the coke oven, and the analytical expression of the control rule is as follows:

[0016] U=〈α*E+(1-α)*EC〉(0<α<1)

[0017] 〈·〉 is a rounding operation, where α is an adjustment factor. The fuzzy control rule is adjusted by adjusting the size of α, that is, the weights of E and EC in the control output are changed.

[0018] Technical effects and advantages of the present invention:

[0019] The present invention can effectively control the temperature in the coke oven by fully automatically acquiring and capturing the temperature data in the coke oven, automatically collecting and automatically adjusting, so that the temperature fluctuation in the coke oven is small and the temperature is more stable, thereby improving the timeliness and accuracy of the coke oven temperature management and reducing the labor intensity of workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the optical fiber structure.

[0021] Figure 2 It is a schematic diagram of the structure of the optical lens.

[0022] Figure 3 This is the system control block diagram.

[0023] Figure 4 This is the block diagram of the smoke duct suction control. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] A coke oven automatic heating control system, comprising:

[0026] Raw gas temperature measurement module, used to obtain real-time temperature data of raw gas in the coke oven system;

[0027] The vertical fire channel temperature module is used to obtain the temperature data in the vertical fire channel;

[0028] The gas flow control unit automatically adjusts the heating gas flow according to the temperature data in the vertical fire channel;

[0029] The sub-smoke duct control unit controls the suction force in the sub-smoke duct according to the heating gas flow rate;

[0030] The multi-mode fuzzy control unit controls the temperature inside the coke oven using multi-mode fuzzy control according to the vertical fire channel temperature data and the raw gas temperature data.

[0031] The sub-smoke duct control unit adjusts the suction force in the sub-smoke duct by controlling the opening of the inner flap of the sub-smoke duct;

[0032] Based on the above, the sub-smoke duct flap is automatically controlled to keep the sub-smoke duct suction in an appropriate range, ensuring the reasonable pressure of the combustion system and the appropriate flue oxygen content (excess air coefficient). Since suction control is generally affected by the heating gas flow, air door opening, gas calorific value and climatic conditions, a mathematical model is established through theoretical analysis to find the optimal control value of the sub-smoke duct suction.

[0033] Furthermore, according to the suction data in the sub-smoke duct, a feedforward control model of the suction of the sub-smoke duct is established, and then according to the oxygen content data of zirconium oxide, the feedforward control model is corrected;

[0034] The establishment of the suction model is as follows:

[0035] Collect data on gas flow, flue suction, exhaust oxygen content, damper opening, etc. for more than one month, conduct statistical analysis and significance test analysis, find out the main parameters affecting suction, and establish a flue suction model;

[0036] The parameters include but are not limited to heating gas flow, damper opening, gas calorific value, and temperature and humidity data.

[0037] Based on the above, in addition to the oxygen content data of zirconium oxide, the model can also be corrected based on the analytical data of artificial tests;

[0038] A mode combining forward and feedback control is adopted to adjust the suction of the flue gas duct according to the feedforward control model and the change of the heating gas flow rate, and then feedback adjust and correct the suction target value according to the residual oxygen content in the flue gas duct.

[0039] The raw gas temperature measurement module includes a K-type thermocouple installed in the coke oven bridge pipe, and a GH3039 special high-temperature resistant steel casing is added to the outside of the K-type thermocouple;

[0040] Among them, the temperature measurement range of K-type thermocouple is 0-1100℃, and short-term measurement can reach 1300℃. The normal temperature of raw gas is around 700℃, but under abnormal conditions (not long, at most 20 minutes), it may exceed 1300℃. In order to increase the service life, firstly, the core of the thermocouple is thickened, and secondly, the GH3039 special high-temperature resistant steel casing is selected, which has both good heat resistance and good mechanical properties.

[0041] K-type thermocouples are installed at the bridge pipe. In the large coke oven bridge pipe, a thermocouple flange interface is reserved, which makes installation more convenient.

[0042] The vertical fire channel temperature module includes an optical lens installed at the end of the air blowing pipe, an optical fiber placed in a stainless steel double-layer bridge, and a photoelectric conversion instrument installed on the furnace table or end table;

[0043] like Figure 1 As shown, double quartz infrared transmission optical fiber is used, the core diameter of the optical fiber is 0.2mm, and the heat resistance mainly depends on the material of the coating layer. Polyimide is used, and the temperature resistance can reach 350℃. In addition, there are protective materials and heat insulation hoses outside the optical fiber. The optical fiber is arranged along the rails without affecting the operation of the furnace top. The optical fiber is placed in a stainless steel double-layer bridge frame and heat-insulating materials are laid to prevent direct grilling by flames.

[0044] like Figure 2 As shown, the main materials of optical lenses include optical quartz glass and stainless steel, which are resistant to high temperatures and are not afraid of high-temperature baking. The most important problem with optical lenses is to prevent smoke and dust from polluting the lens and affecting the light intensity. A dustproof system is used to overcome this problem: a one-way valve (one-way ventilation) is installed in front of the optical lens to blow a breeze to the lens to avoid smoke and dust from polluting the lens.

[0045] The gas flow control unit includes a valve for controlling the gas flow, and controls the gas flow according to the vertical fire channel temperature data.

[0046] like Figure 3As shown, a combination of forward and feedback is adopted to automatically adjust the heating gas flow rate according to the fire channel temperature, and automatically adjust the smoke channel suction according to the heating gas flow rate. The multi-mode module control unit controls the vertical fire channel temperature of the coke oven. The analytical expression of its control rule is as follows:

[0047] U=〈α*E+(1-α)*EC〉(0<α<1)

[0048] 〈·〉 is a rounding operation, where α is an adjustment factor. The fuzzy control rule is adjusted by adjusting the size of α, that is, the weights of E and EC in the control output are changed. When the deviation is large, the control system needs to eliminate the deviation. At this time, the weight of the deviation E is too large. When the deviation is small, the control system needs to stabilize the system as soon as possible. At this time, the weight of the change in the deviation EC is too large.

[0049] Based on the above, if Figure 4 As shown, a mode combining forward and feedback control is adopted. The suction of the branch flue is adjusted according to the feedforward control model and the change of the heating gas flow rate. The suction target value is adjusted and corrected according to the residual oxygen content in the branch flue. Considering that the exchange process has a great influence on the oxygen content of the exhaust gas in the branch flue, the residual oxygen content of the flue gas measured by zirconia cannot be directly used as a control parameter, and the data calculated by the feedback model is required as a control parameter.

[0050] On the basis of the above, by fully automatically acquiring and capturing the temperature data in the coke oven, the temperature in the coke oven can be effectively controlled, automatically collected and adjusted, so that the temperature fluctuation in the coke oven is small and the temperature is more stable, which improves the timeliness and accuracy of the coke oven temperature management and reduces the labor intensity of workers.

[0051] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0052] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0053] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A coke oven automatic heating control system, characterized in that: include: Raw gas temperature measurement module, used to obtain real-time temperature data of raw gas in the coke oven system; The vertical fire channel temperature module is used to obtain the temperature data in the vertical fire channel; The gas flow control unit automatically adjusts the heating gas flow according to the temperature data in the vertical fire channel; The sub-smoke duct control unit controls the suction force in the sub-smoke duct according to the heating gas flow rate; The multi-mode fuzzy control unit controls the temperature inside the coke oven using multi-mode fuzzy control according to the vertical fire channel temperature data and the raw gas temperature data.

2. A coke oven automatic heating control system according to claim 1, characterized in that: According to the suction data in the sub-duct, a sub-duct suction feedforward control model is established, and then according to the zirconium oxide oxygen content data, the feedforward control model is corrected.

3. The coke oven automatic heating control system according to claim 1 is characterized in that: A mode combining forward and feedback control is adopted to adjust the suction of the flue gas duct according to the feedforward control model and the change of the heating gas flow rate, and then feedback adjust and correct the suction target value according to the residual oxygen content in the flue gas duct.

4. The coke oven automatic heating control system according to claim 1 is characterized in that: The raw gas temperature measurement module includes a K-type thermocouple installed in the coke oven bridge pipe, and a GH3039 special high-temperature resistant steel casing is added to the outside of the K-type thermocouple.

5. The coke oven automatic heating control system according to claim 1, characterized in that: The vertical fire channel temperature module includes an optical lens installed at the end of the air blowing pipe, an optical fiber placed in a stainless steel double-layer bridge frame, and a photoelectric conversion instrument installed on the furnace table or end table. The optical fiber is a double quartz infrared conduction optical fiber with a core diameter of 0.2mm.

6. A coke oven automatic heating control system according to claim 1, characterized in that: The gas flow control unit includes a valve for controlling the gas flow, and controls the gas flow according to the vertical fire channel temperature data.

7. The coke oven automatic heating control system according to claim 1, characterized in that: The sub-smoke duct control unit adjusts the suction force in the sub-smoke duct by controlling the opening of the inner flap of the sub-smoke duct.

8. The coke oven automatic heating control system according to claim 1, characterized in that: The multi-mode module control unit controls the vertical fire channel temperature of the coke oven, and the analytical expression of its control rule is as follows: U=〈α*E+(1-α)*EC〉(0<α<1) 〈·〉 is a rounding operation, where α is an adjustment factor. The fuzzy control rule is adjusted by adjusting the size of α, that is, the weights of E and EC in the control output are changed.

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