JPS62280320A - Exhaust gas pressure control device for refining furnace - Google Patents

Abstract

PURPOSE:To easily permit the effective utilization of the heat energy retained by the exhaust gas of an installation utilizing the exhaust gas and to automate the pressure control of the exhaust gas by controlling the throttling rate of a flow rate controller provided to the exhaust gas outlet of said installation in accordance with the pressure detected at the tap hole of a refining furnace. CONSTITUTION:The exhaust gas of a melt reduction furnace 1 is supplied through a flue 4 made into hermetic structure to a fluidized preheater 3 so that the heat energy retained by the above-mentioned exhaust gas is effectively utilized. A pressure detector 7 having a pressure sensor 8 is disposed to the tap hole 2 of the above-mentioned melt reduction furnace 1 to detect the pressure in the melt reduction furnace 1. The detected pressure is outputted by an output device 9 to a control device 10. The throttling rate of the flow rate controller 5 installed in the exhaust gas outlet of the fluidized preheater 3 is controlled by a driving device 6 in accordance with the detected value of the pressure. The pressure of the exhaust gas is thereby increased and is automatically controlled to the specified pressure.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Application in Industry A] This invention relates to an exhaust gas pressure control device for a refining furnace, particularly to increasing the exhaust gas pressure and automating the pressure control. .

[Conventional technology] Since the gas pressure is low, when using this exhaust gas,
An exhaust gas treatment device was required to pressurize this exhaust gas. Since the exhaust gas discharged from the furnace mouth is at a high temperature, it is difficult to increase the pressure using a normal exhaust gas treatment device, and therefore a special exhaust gas treatment device is required. That is,
If the exhaust gas is once cooled and then pressurized, and the next step requires heating, such as in a fluidized preheater, it is necessary to raise the gas temperature by partial combustion.

[Problems to be Solved by the Invention] The conventional exhaust gas treatment device as described above has problems in that the device is complicated, there are many unnecessary operations, and thermal energy is wasted.

This invention was made to solve this problem, and provides an exhaust gas pressure IJ control device for a refining furnace that can increase the pressure of exhaust gas with a simple device without wasting the thermal energy possessed by the exhaust gas. The purpose is to

[Means for Solving the Problems] The exhaust gas pressure control device for a refining furnace according to the present invention includes a flue of a closed structure that supplies exhaust gas from the refining furnace to exhaust gas utilization equipment outside the furnace, and a flue of the stray gas utilization equipment. A flow rate adjustment device provided at the wandering gas outlet, a drive device for driving the flow rate adjustment device, and a pressure detection device attached to the outlet of the refining furnace.
It is comprised of a control device that controls the amount of drive of the drive device, that is, the throttle flap of the flow rate adjustment device, based on the output of the pressure detection device to keep the exhaust gas pressure constant.

[Operation] In this invention, the pressure of the refining furnace is detected by the pressure detection device, and the detected result is output to the control device, and this control device controls the amount of drive of the drive device, that is, the amount of throttling of the flow rate adjustment device. and automatically control the exhaust gas pressure of the exhaust gas utilization equipment to a constant value.

[Example] Fig. 1 is an explanatory diagram showing an example of the present invention. In the figure, (1) shows a melting reduction furnace, and (2) shows a melting reduction furnace (1
), (3) is the melting reduction furnace (1).
) installed outside the fluid preheating device (exhaust gas utilization equipment),
(4) is a flue with a closed structure that supplies exhaust gas from the melting reduction furnace (1) to the fluidized preheating device (3), (5) is a flow rate adjustment device provided at the outlet of the fluidized preheating device (3), and (6) ) is the drive device that drives the flow rate adjustment device (5), (7) is the pressure detection device, (8) is the pressure sensor inserted in the outlet (2), and (9) is the output of the pressure detection device (7). The device (10) is a control device that adjusts the drive amount of the drive device (6), that is, the throttle amount of the flow rate adjustment device (5), based on the output of the output device (9).

In the exhaust gas pressure control system of the refining furnace configured as described above, the pressure sensor (8) of the pressure detection device (7) or the pressure of the smelting reduction furnace (1) is detected, and the detected result is output. The device (9) outputs an output to the control device (10), and the control tube device (10) adjusts the drive amount of the drive device (6), that is, the throttle of the flow rate adjustment device (5), and as a result, the flow preheating The exhaust gas pressure of the device (3) is automatically controlled to a constant value.

According to this example, a furnace internal pressure of 1 to 5 Kg/cm2 was achieved. The increase in exhaust gas pressure promotes the next process, that is, the reduction reaction in the fluidized preheater, making it easier to use the exhaust gas, reducing the amount of exhaust gas, and making the equipment more compact.

Incidentally, in the above explanation, the case where the present invention is applied to a smelting reduction furnace has been described, but it goes without saying that it can be applied to other refining furnaces.

[Effects of the Invention] As explained above, in this invention, the pressure detection device detects the pressure in the refining furnace, the detected result is output to the control device, and this control device determines the drive amount of the drive device, that is, the flow rate. The exhaust gas pressure in the exhaust gas usage equipment is automatically controlled to a constant value by adjusting the throttle amount of the exhaust gas adjustment device, making it easier to use the exhaust gas, reducing the amount of exhaust gas, and making the equipment more compact. There is.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

Claims (1)

[Claims] A flue with a closed structure that supplies exhaust gas from the refining furnace to exhaust gas utilization equipment outside the furnace, a flow rate adjustment device provided at the exhaust gas outlet of the exhaust gas utilization equipment, a drive device that drives the flow rate adjustment device, and the smelting process. A pressure detection device attached to the outlet of the furnace, and a control device that controls the drive amount of the drive device, that is, the throttling amount of the flow rate adjustment device, using the output of the pressure detection device to keep the exhaust gas pressure constant. Exhaust gas pressure control device for smelting furnace.