Temperature control method for heating furnace based on heat accumulating type nozzle

A temperature control method and heating furnace technology, which are applied to fluid heaters, lighting and heating equipment, etc., can solve the problems of inadaptability to the furnace temperature control of the original system and large investment of the all-digital discrete control system.

Active Publication Date: 2010-12-29
宝钢日铁汽车板有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a heating furnace temperature control method based on the regenerative burner, which solves the problem of inadaptability to the furnace temperature control of the original system brought about by the use of the regenerative burner and the large investment of the all-digital discrete control system. At the same time, consider reducing the number of actions of the gas opening and closing valve, make full use of the function of the original analog continuous control system, develop a simple digital discrete control system, and organically combine the characteristics of the two to realize the temperature control of the heating furnace based on the transformation of the regenerative burner

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  • Temperature control method for heating furnace based on heat accumulating type nozzle
  • Temperature control method for heating furnace based on heat accumulating type nozzle
  • Temperature control method for heating furnace based on heat accumulating type nozzle

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Experimental program
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Embodiment 1

[0020] The following takes the furnace with eight burners as an example to illustrate the digital discrete control. The burner numbers are A1, A2, A3, A4, B1, B2, B3, and B4, as shown in Table 1. There are five modes (the specific data are for reference only, and different furnaces need to obtain corresponding data through experiments), which can be used to control the burning and stopping to realize the rough adjustment of the temperature. It is generally considered to adopt a feed-forward method, and the overall temperature control strategy is controlled in the manner shown in Table 1.

[0021] Table 1 Digital Discrete Control

[0022] set temperature

[0023] When the set temperature changes from high to low, you can directly switch to the corresponding mode in mode B; when the set temperature changes from low to high, in order to reduce the heating time, you need to first put in MODE1, and cooperate with mode A to heat up at full speed , when the actual temperat...

Embodiment 2

[0025] Such as Figure 4 As shown, a more typical temperature control process. In the initial heating process, mode A is put into operation, Mode 1 is activated in mode B, and all burners burn. At this time, the gas flow rate is opened to the maximum (100%), and the temperature is raised with the maximum capacity. When reaching or approaching the set temperature, according to the PID control, the flow rate begins to decrease. When it decreases to about 40%, if the furnace temperature has not dropped to the set value, it is not appropriate to reduce the flow rate in order to prevent the exhaust gas from being too high. A mode in mode B closes part of the burners for rough temperature control. When the rough adjustment makes the temperature drop to a certain temperature (pre-control temperature, generally 30°C lower than the set temperature), the A mode is put into operation again, and the gas flow starts to be adjusted by PID until the set temperature, and then enters the stab...

Embodiment 3

[0027] When producing a certain product, the furnace temperature is set to 250°C. At this time, mode A is in a stable closed-loop control state, and the gas flow rate V is about 75%. The corresponding mode of mode B is MODE3, that is, A1, A2, B1, and B2 are in the OFF state. . When producing another product, the furnace temperature needs to rise to 300°C. At this time, according to the closed-loop control characteristics of mode A, the gas flow rate V quickly rises to 100%, and at the same time, the mode corresponding to mode B changes to MODE1, that is, A1, A2 and B1, B2 are switched to the ON state, so that all burners are fully opened. Cooperate with method A for rapid heating. When approaching or reaching 300°C, the gas flow rate V gradually decreases to 40%. Due to the inertia of the temperature, the actual temperature will still rise a little. After reaching the pre-control temperature of 270°C, mode A is put into operation again to raise the temperature, and the gas f...

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Abstract

The invention discloses a temperature control method for a heating furnace based on a heat accumulating type nozzle. When the flow of air and gas is larger than that of a balance point, a continuous simulation control mode is adopted for controlling; when the flow of air and gas is smaller than that of the balance point, the adopted continuous simulation control is stopped; burning and stopping controls are carried out on partial nozzles in the heating furnace; the heating furnace is roughly adjusted to the temperature 30 DEG C lower than a set temperature, heating is carried out by reutilizing the continuous simulation control mode to the set temperature while the gas flow starts to be increased based on PID adjustment, and a stable feedback control state is realized. The method provided by the invention can adapt to the temperature control requirements of the heating furnace based on the heat accumulating type nozzle, utilize an organic DCS system to perform digital discrete control programming, make full use of the original system, and save investment, thus having good application and promotion prospects.

Description

technical field [0001] The invention belongs to the field of processing, in particular to a heating furnace temperature control method based on a regenerative burner. Background technique [0002] The hot blast stove is one of the important processes for heating and drying the strip steel in the cold rolling process. Generally, the hot blast stove uses traditional radiant tubes for heating, and the control system is a conventional PID (Proportional Integral Derivative Controller, proportional integral differential adjustment. Device, referred to as PID) closed-loop analog continuous control system, by adjusting the flow rate of combustion gas to control the furnace temperature. The regenerative burner has good energy-saving and consumption-reducing characteristics, and is widely used in the transformation of hot blast stoves. However, due to the different combustion characteristics of the two types of burners, the control system cannot simply copy the conventional closed-loo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24H9/20
Inventor 张伟王鲁
Owner 宝钢日铁汽车板有限公司
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