Gas preheating device of ignition furnace of sintering machine

Abstract

The utility model discloses a coal gas preheating device of an ignition furnace of a sintering machine, which is characterized in that a heating pipe is arranged in a main body of a coal gas preheater, steam is used for heating the heating pipe, a steam pressure storage box is used for coping with the pressure fluctuation of the steam during the starting and operation of the ignition furnace, and the preheater preheats the coal gas by using the high-temperature steam. The method comprises the following steps: stirring a citric acid solution and water through a solution proportioning box, turning off a preheating device, enabling the solution to flow into a pipeline, then carrying out corrosion precipitation, and releasing compressed air from a compressed air storage tank through a pneumatic pump, so that the gas temperature is increased, and the ignition furnace is easier to ignite in winter, thereby reducing the gas consumption and the production cost; and water scale and a solution are discharged through the blow-off pipe through pressure, so that the internal cleanness is ensured, and the situation that the heating effect becomes poor due to the fact that the steam pipeline is blocked due to excessive water scale is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgical equipment, in particular to a gas preheating device for a sintering machine ignition furnace. Background Art

[0002] The sintering machine ignition furnace uses blast furnace gas, and the blast furnace gas must be transported over a long distance to reach the ignition furnace. During the transportation process, moisture is entrained in the gas, resulting in a gradual decrease in the gas temperature, especially more obvious in winter. The lower gas temperature is not conducive to the ignition of the ignition furnace, and the gas consumption increases, increasing production costs. At the same time, too much internal water scale causes pipeline blockage, thus deteriorating the heating effect. Content of the Utility Model

[0003] The purpose of the utility model is to provide a gas preheating device for a sintering machine ignition furnace, so as to solve the problems that the lower gas temperature is not conducive to the ignition of the ignition furnace, the gas consumption increases, the production cost increases, and at the same time, too much internal water scale causes pipeline blockage, thus deteriorating the heating effect.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A gas preheating device for a sintering machine ignition furnace, including a gas preheater main body, a steam main pipeline, and a cleaning device. The gas preheater main body includes a rectangular main body with a hollow interior, and reduced-diameter pipelines are fixedly connected to the front and rear ends. The tops of the reduced-diameter pipelines on the front and rear sides are docked with the gas main pipeline. A number of steam pressure accumulator boxes are evenly distributed on the outer walls on the left and right sides of the gas preheater main body. A steam main pipeline is arranged on one side of the gas preheater main body. The steam pressure accumulator boxes are connected to the steam main pipeline through steam inlet branch pipes and steam outlet branch pipes. A number of heating pipes are connected between the steam pressure accumulator boxes on the left and right sides, are arranged inside the gas preheater main body, and are in contact with the inner wall of the gas preheater main body. A steam inlet branch pipe stop valve is arranged on the steam inlet branch pipe, and a steam outlet branch pipe stop valve is arranged on the steam outlet branch pipe.

[0005] The cleaning device includes a solution proportioning tank, a solution stop valve, a compressed air storage tank, a backwashing valve, and a sewage discharge pipe. The solution proportioning tank is installed on the steam inlet branch pipe through a pipeline, and the solution switch is controlled by the solution stop valve, which is used to clean the water scale in the steam pipeline. The compressed air storage tank is connected to the steam inlet branch pipe through a backwashing pipe, and a backwashing valve is arranged on the backwashing pipe. The backwashing pipe is driven by a pneumatic pump. The sewage discharge pipe is installed on the steam outlet branch pipe, and a sewage discharge valve is arranged on the sewage discharge pipe to control the opening and closing of the sewage discharge pipe.

[0006] Preferably, each steam accumulator box is connected to the steam inlet branch pipe and the steam outlet branch pipe through pipelines. A steam accumulator box inlet stop valve is provided between the steam accumulator box and the steam inlet branch pipe, and a steam accumulator box outlet stop valve is provided between the steam accumulator box and the steam outlet branch pipe, which are used to control the opening and closing of this group of heating pipes.

[0007] Preferably, the heating pipe is a seamless steel pipe.

[0008] Preferably, the outer surface of the main body of the gas preheater is sprayed with anti-corrosion paint.

[0009] Preferably, the main body of the gas preheater, the main steam pipeline, the steam branch pipe, and the gas pipeline are wrapped with rock wool to enhance the heat preservation effect.

[0010] Preferably, one end of the reduced-diameter pipe is square and the other end is round, which is used to increase the flow effect and is convenient for connection at the same time.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] By arranging heating pipes in the main body of the gas preheater and using steam to heat the heating pipes, at the same time, the steam accumulator box is used to cope with the pressure fluctuations of steam during the startup and operation of the ignition furnace. The preheater uses high-temperature steam to preheat the gas, increases the gas temperature, makes it easier to ignite the ignition furnace in winter, thereby reducing the gas consumption and lowering the production cost. Through the solution proportioning tank, the citric acid solution and water are stirred, and the preheating device is turned off. The solution flows into the pipeline, and then corrosion precipitation occurs. Compressed air is released from the compressed air storage tank by the pneumatic pump to blow back inside the pipeline. Through the pressure, the water scale and the solution are discharged through the sewage pipe to ensure the internal cleanliness and avoid the steam pipeline being blocked due to excessive water scale, which may lead to a deterioration of the heating effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic front view of the overall structure of the present utility model.

[0014] Figure 2 It is a schematic diagram of the overall structure of the gas preheating device of the present utility model.

[0015] Figure 3 It is a schematic internal sectional view of the gas preheating device of the present utility model.

[0016] Figure 4 It is a schematic diagram of the steam flow direction when the gas of the present utility model is not heated.

[0017] Figure 5 It is a schematic diagram of the steam flow direction when the gas of the present utility model is heated.

[0018] In the figure: 1. Main body of gas preheater; 2. Main gas pipeline; 3. Main steam pipeline; 4. Steam accumulator box; 5. Reducing pipeline; 6. Compressed air storage tank; 7. Solution proportioning tank; 8. Drain pipe; 31. Steam inlet branch pipe; 32. Steam outlet branch pipe; 300. Main steam pipeline stop valve; 310. Steam inlet branch pipeline stop valve; 320. Steam outlet branch pipeline stop valve; 41. Heating pipe; 401. Steam accumulator box inlet stop valve; 402. Steam accumulator box outlet stop valve; 801. Drain valve. Detailed implementation mode

[0019] In order to make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the present utility model will be further described below in conjunction with the specific implementation modes.

[0020] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0021] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0023] Example 1: Please refer to Figures 1-5, an embodiment provided by the present utility model: a gas preheating device for a sintering machine ignition furnace, including a gas preheater main body 1, which is used to preheat the blast furnace gas entering the sintering machine ignition furnace, increase its temperature to promote the ignition and combustion process. The outer surface of the gas preheater main body 1 is sprayed with anti-corrosion paint. Spraying anti-corrosion paint on the surface can effectively protect the gas preheater main body 1 from the influence of corrosion, extend its service life, reduce maintenance costs, a steam main pipeline 3, a cleaning device. The gas preheater main body 1 includes a rectangular main body with a hollow interior. The front and rear ends are fixedly connected with variable-diameter pipes 5. One end of the variable-diameter pipe 5 is square, and the other end is circular. The circular end usually has more smooth flow characteristics, which is beneficial to reducing fluid resistance and pressure loss. The square end can be more easily connected to other equipment or pipelines and provide a more uniform flow distribution. The design of the square end can better adapt to the situation where a larger flow cross-section is required, while reducing space occupation, meeting the use in some occasions with limited space or where it is necessary to convey through narrow channels. The top ends of the variable-diameter pipes 5 on the front and rear sides are docked with the gas main pipeline 2. The gas main pipeline 2 conveys gas into the preheating device, and then conveys the preheated blast furnace gas to the ignition furnace to supply the gas required for ignition and combustion. A number of steam accumulator boxes 4 are evenly distributed on the outer walls on the left and right sides of the gas preheater main body 1. A steam main pipeline 3 is arranged on one side of the gas preheater main body 1. The steam main pipeline 3 is used to convey steam. The steam accumulator boxes 4 are connected to the steam main pipeline 3 through steam inlet branch pipes 31 and steam outlet branch pipes 32. A number of heating pipes 41 are connected between the steam accumulator boxes 4 on the left and right sides. The heating pipes 41 are seamless steel pipes, arranged inside the gas preheater main body 1 and in contact with the inner wall of the gas preheater main body 1. A steam inlet branch pipe stop valve 310 is arranged on the steam inlet branch pipe 31. The steam inlet branch pipe stop valve 310 is used to control or cut off the flow of the steam inlet branch pipe 31. A steam outlet branch pipe stop valve 320 is arranged on the steam outlet branch pipe 32. The gas preheater main body 1, the steam main pipeline 3, the steam branch pipes, and the gas pipelines are externally wrapped with rock wool to increase the heat preservation effect. Wrapping with rock wool externally can provide a good heat preservation effect, reduce heat loss, and improve energy utilization efficiency. This is particularly important for equipment such as preheaters and pipelines that need to maintain a certain temperature. Especially in a cold environment, it can maintain a stable working temperature. By increasing the heat preservation effect, the surface temperature of the equipment can be reduced, and the risk of accidental accidents caused by touching the high-temperature surface can be reduced.Meanwhile, the anti-corrosion paint can also ensure the flatness of the equipment surface, reduce the possibility of accidental injuries, improve energy utilization efficiency by reducing heat loss. Such a design can reduce energy consumption and greenhouse gas emissions, meeting the requirements of environmental protection and energy conservation and emission reduction. The steam outlet branch pipe stop valve 320 is used to control or cut off the flow of the steam outlet branch pipe 32. In the specific implementation manner, the gas enters the preheater main body through the main pipe, and enters the ignition furnace direction through the pipe from the outlet. Open the steam main pipe stop valve 300, close the steam inlet branch pipe stop valve 310 and the steam outlet branch pipe stop valve 320. At this time, the steam does not enter the heating pipe 41 in the preheater main body, and the gas is not heated. The gas enters the preheater main body through the main pipe, and enters the ignition furnace direction through the pipe from the outlet. Close the steam main pipe stop valve 300, open the steam inlet branch pipe stop valve 310 and the steam outlet branch pipe stop valve 320, and at the same time open the steam accumulator inlet stop valve 401; the steam accumulator outlet stop valve 402. The high-temperature steam passes through the heating pipe 41 in the preheater main body in the direction of the illustrated arrow to heat the gas in the preheater main body.

[0024] Example 2: Please refer to Figure 1 , on the basis of Example 1, it further includes the following structure:

[0025] Cleaning device, including a solution proportioning tank 7, used to store the cleaning solution (the solution is citric acid solution, and the concentration of the solution is controlled through proportioning to effectively clean the scale in the steam pipeline), a solution stop valve (the solution stop valve is used to control the flow of the solution, and can open or close the pipeline for the solution to flow to the cleaning device, thereby controlling the progress of the cleaning operation), a compressed air storage tank 6, a backflush valve, and a drain pipe 8. The solution proportioning tank 7 is installed on the steam inlet branch pipe 31 through a pipeline, and the solution switch is controlled by the solution stop valve, which is used to clean the scale in the steam pipeline. The compressed air storage tank 6 is connected to the steam inlet branch pipe 31 through a backflush pipe, and a backflush valve is arranged on the backflush pipe and installed on the backflush pipe, which is used to control the compressed air flowing from the storage tank to the steam inlet branch pipe 31 for backflush operation. The backflush pipe is driven by a pneumatic pump. The drain pipe 8 is installed on the steam outlet branch pipe 32, and a drain valve 801 is arranged on the drain pipe 8. The drain valve 801 is a valve used to discharge waste water, waste gas, etc., and is used to control the switch of the drain pipe 8. When in use, the whole preheating device is closed, then the solution stop valve is opened, and at the same time the steam main pipeline stop valve 300 is closed. The liquid mixed with citric acid solution and water flows into the steam pipeline and the heating pipe 41, and then stands for reaction. After the reaction, the backflush valve is opened, and driven by the pneumatic pump, the compressed air in the compressed air storage tank 6 is used to backflush the inside through the backflush pipe. Then the solution and the scale are taken out under pressure. Then the drain valve 801 is opened, and at the same time the drain valve on the steam outlet branch pipe 32 is closed, and the sewage is discharged through the drain pipe 8 to ensure the inside is clean and avoid the steam pipeline being blocked due to excessive scale, which will lead to a deterioration of the heating effect.

[0026] The above are only embodiments of the present invention, and common knowledge such as the specific structures and characteristics known in the solutions is not described in detail here. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A gas preheating device for a sintering machine ignition furnace, characterized in that: The invention comprises a gas preheater body (1), a steam main pipeline (3), and a cleaning device. The gas preheater body (1) comprises a rectangular body with a hollow interior. A reducing pipeline (5) is fixedly connected at both ends. The top ends of the reducing pipelines (5) on both sides are connected to the gas main pipeline (2). A plurality of steam pressure accumulators (4) are evenly distributed on the left and right outer walls of the gas preheater body (1). A steam main pipeline (3) is arranged on one side of the gas preheater body (1). The steam pressure accumulator (4) is connected to the steam main pipeline (3) through a steam inlet branch pipe (31) and a steam outlet branch pipe (32). A plurality of heating pipes (41) are connected between the steam pressure accumulators (4) on the left and right sides. The heating pipes (41) are arranged in the gas preheater body (1) and contact the inner wall of the gas preheater body (1). A steam inlet branch pipe stop valve (310) is arranged on the steam inlet branch pipe (31), and a steam outlet branch pipe stop valve (320) is arranged on the steam outlet branch pipe (32). The cleaning device comprises a solution proportioning box (7), a solution stop valve, a compressed air storage tank (6), a backflush valve and a drain pipe (8); the solution proportioning box (7) is installed on a steam intake branch pipe (31) via a pipeline; the solution switch is controlled by the solution stop valve and is used to clean scale in the steam pipeline; the compressed air storage tank (6) is connected to the steam intake branch pipe (31) via a backflush pipe; a backflush valve is provided on the backflush pipe; the backflush pipe is driven by a pneumatic pump; the drain pipe (8) is installed on a steam outlet branch pipe (32); a drain valve (801) is provided on the drain pipe (8) and is used to control the switch of the drain pipe (8).

2. The gas preheating device for the sintering machine ignition furnace according to claim 1, characterized in that: Each steam accumulator box (4) is connected to the steam inlet branch pipe (31) and the steam outlet branch pipe (32) via a pipeline; a steam accumulator box inlet stop valve (401) is provided between the steam accumulator box (4) and the steam inlet branch pipe (31); and a steam accumulator box outlet stop valve (402) is provided between the steam accumulator box (4) and the steam outlet branch pipe (32), for controlling the opening and closing of the group of heating pipes (41).

3. The gas preheating device for the sintering machine ignition furnace according to claim 1, characterized in that: The heating tube (41) is a seamless steel tube.

4. The gas preheating device for the sintering machine ignition furnace according to claim 1, characterized in that: The outer surface of the gas preheater body (1) is sprayed with anti-corrosion paint.

5. The gas preheating device for the sintering machine ignition furnace according to claim 1, characterized in that: The gas preheater body (1), the steam main pipe (3), the steam branch pipe, and the gas pipe are wrapped with rock wool to increase the thermal insulation effect.

6. The gas preheating device for the sintering machine ignition furnace according to claim 1, characterized in that: The variable diameter pipe (5) has a square shape at one end and a round shape at the other end, which is used to increase the flow effect and facilitate connection.

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