CN203240767U - Hot blast stove combustion optimal control system - Google Patents

Abstract

The utility model provides a hot blast stove combustion optimal control system. The system comprises a hot blast stove (1), a DCS (2), an OPC uploading port (3), an OPC downloading port (4) and an optimal controller (5). Operating parameters of the hot blast stove in the DCS is read by the hot blast stove combustion optimal control system through the OPC uploading port. An optimal coal-air ratio under the current working condition is calculated by the optimal controller according to the actual operational condition. The optimized control parameters are sent to the DCS through the OPC downloading port so that closed loop and optimal control of the hot blast stove can be achieved. According to the hot blast stove combustion optimal control system, the hot blast stove is prevented from being influenced by the negative factors of coal and air pressure frequency fluctuation, the change of gas calorific values and the like, so that the arch top temperature of the hot blast stove is stabilized to a set value and the stable operation and the economical combustion of the hot blast stove are achieved.

Description

Combustion Optimization Control System for Hot Blast Stove

technical field

The utility model relates to a computer control system, in particular to a combustion optimization control system for a hot blast stove.

Background technique

The hot blast stove is an important accessory equipment of the blast furnace ironmaking process. It is a heat exchanger for heating the blast. Modern blast furnaces generally use regenerative hot blast stoves. The operation of the hot blast stove directly affects the level of the air temperature. Since the gas pressure and calorific value are constantly changing, in order to achieve the best combustion state, it is necessary to continuously adjust the supply of air and gas, which will bring great harm to the operation of the hot blast stove. Certain difficulty and high labor intensity. At the same time, if the air volume is insufficient and the combustion is insufficient, the combustion efficiency is definitely not high, and it is also directly related to the quality of the soot emission of the hot blast stove, which will cause serious pollution to the environment; but too much air It will also increase the heat taken away by the smoke exhaust, which is also uneconomical. At present, the combustion optimization of the hot blast stove mainly relies on the commissioning personnel to continuously observe the change of the vault temperature. If the current vault temperature rises rapidly and the current ratio is considered appropriate based on experience, no adjustment will be made; if the vault rises slowly or falls, according to experience If it is judged that the ratio is out of balance, the operator will adjust the amount of air or gas to obtain the best air-to-coal ratio operation mode. This control method is time-consuming and labor-intensive. At the same time, this combustion adjustment method cannot be changed according to operating conditions. Real-time automatic adjustment of the control scheme makes the hot blast stove in the best operating condition, resulting in waste of resources.

Based on this, how to invent a hot blast stove combustion optimization control system, so that the hot blast stove can automatically operate under various gas pressure and calorific value changes, and achieve the maximum combustion efficiency, improve the air supply temperature, is the main problem to be solved by the utility model .

Contents of the invention

The utility model overcomes the deficiencies of the prior art, and proposes a combustion optimization control system for a hot blast stove, which can automatically operate under different gas pressures and calorific value changes. It has changed the situation that the hot blast stove has been basically operated manually for a long time, greatly improved the operating efficiency of the hot blast stove, increased the temperature of the air supply, and reduced the cost of personnel. The system has a high degree of automation and good reliability.

In order to achieve the above technical problems, the utility model adopts the following technical solutions to achieve: a hot stove combustion optimization control system, including hot stove (1), DCS control system (2), OPC upload interface (3), OPC download interface ( 4), optimize the controller (5). The system reads the operating parameters of the hot blast stove in the DCS control system through the OPC upload interface, stores them in the optimization controller, and establishes a mathematical model of the combustion effect of the hot blast stove. Coal ratio and optimal control mode are selected, and the optimized control parameters are sent to the DCS control system through the OPC download interface to realize the closed-loop and optimal control of the hot blast stove.

Furthermore, the optimization controller (5) in the combustion optimization control system of the hot blast stove is realized by an embedded controller, which is composed of a PID controller and a self-optimization controller. Suppose the set value of the vault temperature of the hot blast stove is S, the current real-time value of the vault temperature is T, and the selection error is e. When the difference between the real-time value T of the vault temperature and the set value S is greater than the selection error e, the PID controller is used to quickly and smoothly control the vault temperature of the hot blast stove to the vicinity of the set value; when the real-time value T of the vault temperature and When the set value S difference is less than or equal to the selection error e, the self-optimizing controller is used to continuously optimize the air-to-coal ratio, so that the vault temperature of the hot blast stove is gradually controlled to the set value, and the stable operation and economical combustion of the hot blast stove are realized.

Furthermore, in order to ensure the rapidity and reliability of the communication between the DCS control system (2) and the optimization controller (5), the system adopts the OPC communication method, which mainly includes two parts: the OPC download interface and the OPC upload interface; the OPC upload interface The interface is mainly used to optimize the controller (5) to read the data in the DCS control system (2), and the OPC download interface is mainly used to optimize the controller (5) to send the optimized control data to the DCS control system (2). The DCS control system (2) realizes optimal control of the hot blast stove (1).

Compared with the prior art, the utility model has the following functions and advantages:

(1) The system solves the problem of how to maximize the combustion efficiency of the hot blast stove under the existing conditions - the hot blast stove combustion optimization control system can greatly increase the temperature of the air supply, increase the output, and save costs;

(2) The system improves the stability of the operation of the hot blast stove;

(3) The system improves the self-control rate, reduces the labor intensity of workers, and significantly improves production efficiency.

After reading the detailed description of the embodiments of the utility model in conjunction with the accompanying drawings, other features and advantages of the utility model will become more clear. the

Description of drawings

Fig. 1 is a block diagram of a hot stove combustion optimization control system proposed by the utility model.

Fig. 2 is a schematic diagram of the control mode of a hot stove combustion optimization control system proposed by the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in further detail.

Embodiment 1, referring to Fig. 1, this embodiment is a block diagram of a hot blast stove combustion optimization control system;

Including hot blast stove (1), DCS control system (2), OPC upload interface (3), OPC download interface (4), optimization controller (5). The system reads the operating parameters of the hot blast stove (1) in the DCS control system (2) through the OPC upload interface (3), and stores the operating parameters of the hot blast stove in the optimization controller (5). The exhaust gas temperature judges the operation of the hot blast stove, and then judges whether to use PID control or self-optimization control according to the change of the main control target parameters of the hot blast stove, such as the set value of the vault temperature. The optimization controller calculates the gas valve opening, air valve opening, induced draft motor opening and other specific optimization values of the hot blast stove according to the actual operating conditions, as well as the best air-to-coal ratio under the current working conditions, and the optimized The control parameters are sent to the DCS control system (2) through the OPC download interface (4) to realize closed-loop and optimal control of the hot blast stove (1).

Embodiment 2, as shown in Figure 2, this embodiment is a schematic diagram of the control mode of a hot blast stove combustion optimization control system;

Set the selection error e=5%, and the control steps are as follows: (1) Temperature rising process: the first step, the operator inputs the temperature setting value of the hot blast stove vault according to the actual needs; the second step, the system judges the actual temperature and Set the temperature difference, if the difference is greater than the selection error e, the system adopts PID control to quickly and steadily increase the temperature of the vault of the hot blast stove to the vicinity of the set value, if the difference between the actual temperature and the set temperature is less than the selection error e , the system adopts rolling self-optimization control, takes the thermal efficiency of the hot blast stove as the optimization goal, and continuously optimizes the air-to-coal ratio through the self-optimization algorithm, and finally stabilizes the vault temperature of the hot blast stove at the set value. (2) Temperature drop process: In the first step, the operator inputs the set value 2 of the temperature value of the hot blast stove vault according to actual needs; in the second step, the system judges the difference between the actual temperature and the set temperature, if the difference is greater than the selection error When e, the system adopts PID control to quickly and smoothly lower the temperature of the hot blast stove vault to the vicinity of the set value. The thermal efficiency of the furnace is the optimization goal. Through the self-optimization algorithm, the air-to-coal ratio is continuously optimized, and finally the vault temperature of the hot blast furnace is stabilized at the set value.

Of course, the above description is not a limitation of the present utility model, and the present utility model is not limited to the above-mentioned examples. Those of ordinary skill in the art may make changes, modifications, additions or replacements within the essential scope of the present utility model. It should also belong to the protection scope of the present utility model. the

Claims (3)

1. blast furnace and hot blast cupola combustion Optimal Control System, comprise hot-blast stove (1), DCS control system (2), OPC uploads interface (3), OPC download interface (4), optimal controller (5), it is characterized in that: system uploads the operational factor that interface (3) reads hot-blast stove (1) in the DCS control system (2) by OPC, calculate best coal-air ratio under the current working by optimal controller according to practical operation situation, and the control parameter after will optimizing is given DCS control system (2) by OPC download interface (4) hot-blast stove (1) is realized closed loop and optimal control.

2. a kind of Combustion of Hot Air Furnace Optimal Control System according to claim 1 is characterized in that: described optimal controller (5) adopts embedded controller to realize, is made of PID controller and self-optimizing control device two parts.

3. a kind of Combustion of Hot Air Furnace Optimal Control System according to claim 1, it is characterized in that: for guaranteeing rapidity and the reliability of communication between DCS control system (2) and the optimal controller (5), adopt the OPC communication modes, comprise that OPC download interface and OPC upload interface two parts.

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