Automatic temperature control and air supplement device for wood-burning stage of top-blown furnace

Abstract

The utility model discloses a kind of top-blown furnace wood charcoal oven stage automatic temperature control air supplementing device, including combustion-supporting air pipe, secondary air supplementing pipe, flue gas sampling tube, carbon monoxide analyzer and controller, combustion-supporting air pipe, secondary air supplementing pipe and flue gas sampling tube are all inserted in top-blown furnace;The side of combustion-supporting air pipe extending out of top-blown furnace is equipped with compressed air control valve;The side of secondary air supplementing pipe extending out of top-blown furnace is equipped with secondary air supplementing valve;Carbon monoxide analyzer is installed at the end of flue gas sampling tube extending out of top-blown furnace;Carbon monoxide analyzer and controller are electrically connected, and controller is electrically connected with compressed air control valve and secondary air supplementing valve respectively.The utility model realizes the temperature online accurate control of wood charcoal oven stage, eliminates the safety environmental protection risk caused by flue gas CO.

Description

Technical Field

[0001] This utility model relates to the field of metallurgical furnace technology, specifically an automatic temperature control and air supply device for the wood drying stage of a top-blown furnace. Background Technology

[0002] To improve the performance of refractory materials in top-blown furnaces used in smelting, a rigorous furnace drying process is required after each replacement of the furnace lining refractory material. A reasonable temperature rise curve is formulated based on the physicochemical properties of the refractory material, and the refractory material is dried according to this curve before use. In the initial stage of the furnace temperature rise, wood burning is often used to meet the low-temperature drying requirements. However, because top-blown furnaces are designed to be very tall, typically exceeding 10 meters, the distribution of exhaust ports at the bottom is uneven, and there are limitations to air supply from these ports. This results in insufficient and uneven drying of the furnace, leading to a significant safety and environmental risk due to the large amount of CO entering the flue. Furthermore, the furnace temperature trend deviates significantly from the planned temperature rise curve during the drying process, resulting in unsatisfactory drying effects.

[0003] Therefore, providing an automatic temperature control and air supply device for the firewood drying stage of a top-blown furnace is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the present invention provides an automatic temperature control and air supply device for the firewood drying stage of a top-blown stove, which realizes online and precise temperature control during the firewood drying stage and eliminates the safety and environmental risks caused by CO in the flue gas.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An automatic temperature control and air supply device for the wood drying stage of a top-blown furnace includes a combustion air duct, a secondary air supply duct, a flue gas sampling pipe, a carbon monoxide analyzer, and a controller. The combustion air duct, the secondary air supply duct, and the flue gas sampling pipe are all inserted into the top-blown furnace. A compressed air control valve is installed on one side of the combustion air duct extending out of the top-blown furnace. A secondary air supply valve is installed on one side of the secondary air supply duct extending out of the top-blown furnace. The carbon monoxide analyzer is installed at the end of the flue gas sampling pipe extending out of the top-blown furnace. The carbon monoxide analyzer is electrically connected to the controller, and the controller is electrically connected to both the compressed air control valve and the secondary air supply valve.

[0007] By adopting the above technical solutions, the beneficial technical effects of this utility model are as follows:

[0008] The carbon monoxide analyzer transmits the collected data to the controller, which then controls the compressed air control valve and the secondary air supply valve online to adjust the combustion air volume and the secondary air supply volume. This enables precise online temperature control during the wood drying stage, eliminating the safety and environmental risks posed by CO in the flue gas.

[0009] Furthermore, it also includes two compression hoses, one end of which is connected to the outer extension end of the combustion air duct and the secondary air supply duct respectively via a connector, and the other end of each hose is connected to a blower.

[0010] Furthermore, the combustion-supporting air duct, the secondary air supply duct, and the flue gas sampling duct are bonded together.

[0011] Furthermore, it also includes a fixed crossbar, through which the combustion air duct, the secondary air supply duct, and the flue gas sampling pipe extend from one side of the top-blown furnace and are connected together.

[0012] Furthermore, the combustion air duct is inserted into the top-blown furnace to a depth of 2 / 3 of the furnace's height, and the inner diameter of the combustion air duct is 50mm; the flue gas sampling pipe is inserted into the top-blown furnace to a depth of 1 / 3 of its height, and the inner diameter of the flue gas sampling pipe is 15mm; the secondary air supply duct is inserted into the top-blown furnace to a depth of 2 meters, and the inner diameter of the secondary air supply duct is 50mm. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0014] Figure 1 The attached figure is a structural schematic diagram of an automatic temperature control and air supply device for the firewood drying stage of a top-blown stove provided by this utility model;

[0015] Figure 2 The attached figure is a partially enlarged structural schematic diagram of an automatic temperature control and air supply device for the firewood drying stage of a top-blown stove provided by this utility model. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] like Figures 1-2As shown in the figure, this utility model embodiment discloses an automatic temperature control and air supply device for the firewood drying stage of a top-blown furnace, including a combustion air duct 1, a secondary air supply duct 2, a flue gas sampling pipe 3, a carbon monoxide analyzer 4, and a controller 5. The combustion air duct 1, the secondary air supply duct 2, and the flue gas sampling pipe 3 are all inserted into the top-blown furnace 6. A compressed air control valve 7 is installed on the side of the combustion air duct 1 extending out of the top-blown furnace 6; a secondary air supply valve 8 is installed on the side of the secondary air supply duct 2 extending out of the top-blown furnace 6; and the carbon monoxide analyzer 4 is installed in the flue gas sampling pipe 6. The gas sampling tube 3 extends from the end of the top-blown furnace 6. In this embodiment, the carbon monoxide analyzer 4 is an infrared CO analyzer. The carbon monoxide analyzer 4 can monitor the CO concentration in the flue gas and the furnace temperature online. The CO concentration monitoring range is 0-5000ppm, and the furnace temperature is 0-1200℃. The carbon monoxide analyzer 4 is electrically connected to the controller 5, which is electrically connected to the compressed air control valve 7 and the secondary air supply valve 8. In this embodiment, the controller model is YC-PF. The carbon monoxide analyzer 4 transmits the collected data to the controller 5. The controller 5 implements online control of the compressed air control valve 7 and the secondary air supply valve 8 to adjust the combustion air volume and the secondary air supply volume, thereby achieving precise online temperature control during the wood drying stage, improving the baking and preheating effect of refractory materials, and eliminating the safety and environmental risks caused by CO in the flue gas.

[0018] Specifically, it also includes two compression hoses 9. One end of each compression hose 9 is connected to the outer extension of the combustion air duct 1 and the secondary air supply duct 2 via a connector 10, and the other end is connected to the blower. The compressed air supply pressure is 0.2-1MPa.

[0019] Specifically, the combustion air duct 1, the secondary air supply duct 2, and the flue gas sampling pipe 3 are bonded together. In this embodiment, the combustion air duct 1, the secondary air supply duct 2, and the flue gas sampling pipe 3 are all intermediate steel pipes.

[0020] Specifically, it also includes a fixed crossbar 11, and the combustion air duct 1, the secondary air supply duct 2 and the flue gas sampling pipe 3 extend out of one side of the top-blown furnace 6 and are connected together by the fixed crossbar 11.

[0021] Specifically, the combustion air duct 1 is inserted into the top-blown furnace 6 to a depth of 2 / 3 of the height of the top-blown furnace 6, and the inner diameter of the combustion air duct 1 is 50mm; the flue gas sampling pipe 3 is inserted into the top-blown furnace 6 to a depth of 1 / 3 of the height of the top-blown furnace 6, and the inner diameter of the flue gas sampling pipe 3 is 15mm; the secondary air supply pipe 2 is inserted into the top-blown furnace 6 to a depth of 2 meters, and the inner diameter of the secondary air supply pipe 2 is 50mm.

[0022] The working process of this utility model:

[0023] Before the wood drying operation begins, a layer of wood about 2m deep is laid at the bottom of the top-blown furnace 6, and a small amount of diesel oil is poured on it for ignition. The temperature control and air supply device is lifted high using a crane with a fixed crossbar 11. The combustion air pipe 1, the secondary air supply pipe 2, and the flue gas sampling pipe 3 are inserted into the cavity in the center of the top of the top-blown furnace 6. The operator sets the temperature on the controller 5 and throws a lit torch into the furnace to ignite the wood. The temperature control and air supply device automatically adjusts the combustion air volume according to the set temperature. The CO generated during the drying process is burned off by the secondary air supply. The controller 5 adjusts the secondary combustion air volume to ensure that the CO concentration in the flue gas is between 0-1200ppm.

[0024] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0025] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for automatic temperature control and air supply in the wood firing stage of a top-blown furnace, characterized in that, The system includes a combustion air duct, a secondary makeup air duct, a flue gas sampling tube, a carbon monoxide analyzer, and a controller. The combustion air duct, the secondary makeup air duct, and the flue gas sampling tube are all inserted into a top-blown furnace. A compressed air control valve is installed on the side of the combustion air duct extending out of the top-blown furnace. A secondary makeup air valve is installed on the side of the secondary makeup air duct extending out of the top-blown furnace. The carbon monoxide analyzer is installed at the end of the flue gas sampling tube extending out of the top-blown furnace. The carbon monoxide analyzer is electrically connected to the controller, and the controller is electrically connected to both the compressed air control valve and the secondary makeup air valve.

2. The automatic temperature control air supplement device for the wood-fired oven phase of a top-blown furnace according to claim 1, characterized in that, It also includes two compression hoses, one end of which is connected to the outer extension of the combustion air duct and the secondary air supply duct respectively via a connector, and the other end of each hose is connected to a blower.

3. The automatic temperature control and air supply device for the wood drying stage of a top-blown stove according to claim 1, characterized in that, The combustion-supporting air duct, the secondary air supply duct, and the flue gas sampling duct are bonded together.

4. The automatic temperature control air supplement device for the wood-chip baking stage of a top-blown furnace according to claim 1 or 3, characterized in that, It also includes a fixed crossbar, and the combustion air duct, the secondary air supply duct and the flue gas sampling pipe extend out of one side of the top-blown furnace and are connected together by the fixed crossbar.

5. The automatic temperature control air supplement device for the wood-fired oven phase of a top-blown furnace according to claim 1, characterized in that, The combustion air duct is inserted into the top-blown furnace to a depth of 2 / 3 of the furnace's height, and the inner diameter of the combustion air duct is 50 mm; the flue gas sampling pipe is inserted into the top-blown furnace to a depth of 1 / 3 of its height, and the inner diameter of the flue gas sampling pipe is 15 mm; the secondary air supply duct is inserted into the top-blown furnace to a depth of 2 meters, and the inner diameter of the secondary air supply duct is 50 mm.

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