System for reducing corrosion to impeller of induced draft fan and cloth bag of dust remover in coalification thermodynamic workshop

Abstract

The utility model discloses a system for reducing corrosion to an impeller of an induced draft fan and a cloth bag of a dust remover in a coalification thermodynamic workshop. The system comprises the induced draft fan and an accumulated liquid collecting device, the induced draft fan is used for extracting flue gas subjected to dust removal by the dust remover in the boiler into the outlet flue; the accumulated liquid collecting device is positioned on the ground below the outlet flue, is close to the desulfurizing tower and comprises a flow guide pipe and a liquid collecting container; and the flow guide pipe is vertically arranged, the upper end of the flow guide pipe is communicated with the outlet flue, the lower end of the flow guide pipe is communicated with the liquid collecting container, and the flow guide pipe is used for guiding corrosive liquid generated after cold condensation in the outlet flue and enabling the liquid to enter the liquid collecting container. According to the utility model, corrosive liquid in the outlet flue of the induced draft fan is guided into the liquid collecting container by the flow guide pipe, so that the corrosive liquid can be prevented from corroding an impeller of the induced draft fan and a cloth bag of the dust collector; the liquid in the liquid collecting container is discharged at regular time, so that the environment is prevented from being polluted, and the operation is convenient and safe.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of boiler exhaust equipment, especially relates to the system that coal chemical heat dynamic workshop reduces the corrosion to induced draft fan impeller and dust collector cloth bag. BACKGROUND

[0002] In thermal power plants, the flue gas generated by the boiler contains a large amount of harmful substances such as sulfur dioxide. These flue gases first pass through the electric dust collector to remove dust, and then enter the induced draft fan. The flue duct at the outlet of the induced draft fan is connected to the desulfurization tower to ensure that the flue gas has been pressurized before entering the desulfurization tower, thereby ensuring that the flue gas can smoothly pass through the desulfurization tower for desulfurization treatment.

[0003] The flue gas generated by the boiler contains moisture. On the one hand, during the combustion process, the moisture in the fuel will be converted into water vapor and enter the flue gas. On the other hand, after the flue gas is treated by wet desulfurization and other purification processes, the amount of saturated water vapor and small droplets in the flue gas will increase. These moisture may originally exist in the form of water vapor, but it will condense into liquid during the cooling process.

[0004] The induced draft fan outlet damper door is one of the important equipment for ensuring production safety and efficiency. Its main function is to control the amount and direction of gas discharge to ensure the normal operation of the equipment. During the flue gas desulfurization process, the treated flue gas may contain moisture before entering the chimney. Due to the poor closing of the induced draft fan outlet damper door, the flue gas containing moisture enters the outlet of the induced draft fan and condenses to produce corrosive liquid after cooling. The liquid may contain various pollutants such as sulfate and heavy metal ions. If it enters the induced draft fan impeller and the dust collector cloth bag, it will corrode the equipment and affect the normal operation of the equipment. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a system for reducing the corrosion of the induced draft fan impeller and the dust collector cloth bag in the coal chemical heat dynamic workshop, to solve the problem of corrosive liquid produced by the flue duct at the outlet of the induced draft fan condensing after cooling, entering the induced draft fan impeller and the dust collector cloth bag, and affecting the normal operation of the equipment.

[0006] The utility model adopts the following technical scheme:

[0007] The system for reducing the corrosion of the induced draft fan impeller and the dust collector cloth bag in the coal chemical heat dynamic workshop comprises:

[0008] The induced draft fan is used to extract the flue gas that has been dusted by the dust collector in the boiler into the outlet flue. The outlet flue of the induced draft fan is inclined upward, with its low end communicating with the induced draft fan and its high end communicating with the desulfurization tower. The outlet flue is used to guide the flue gas into the desulfurization tower, so that the flue gas is discharged after being desulfurized by the desulfurization tower;

[0009] The liquid collection device is arranged below the ground surface near the desulfurization tower, and comprises a flow guide pipe and a liquid collecting container; the flow guide pipe is vertically arranged, with the upper end communicated with the outlet flue and the lower end communicated with the liquid collecting container; the flow guide pipe is used for guiding the corrosive liquid condensed in the outlet flue, and the liquid is guided into the liquid collecting container; and the liquid in the liquid collecting container is discharged at a fixed time, so that the corrosive liquid can not corrode the impeller of the induced draft fan and the cloth bag of the dust collector.

[0010] Further, the liquid collecting container is an open-top container, and the top opening of the container is communicated with the flow guide pipe through a flange.

[0011] Further, a liquid discharge hole is arranged on the side wall of the liquid collecting container, and a discharge pipe is arranged on the liquid collecting container, and the discharge pipe is communicated with the liquid collecting container through the liquid discharge hole, and a ball valve is arranged on the discharge pipe and used for discharging the corrosive liquid at a fixed time.

[0012] Further, a support is fixedly connected to the bottom of the liquid collecting container and used for supporting the liquid collecting container.

[0013] The beneficial effects of the present application are as follows:

[0014] The flow guide pipe arranged below the outlet flue can timely guide the corrosive liquid condensed in the outlet flue, and prevent the corrosive liquid from entering the impeller of the induced draft fan and the cloth bag of the dust collector and affecting the normal operation of the equipment.

[0015] The liquid collecting container arranged below the flow guide pipe can collect the corrosive liquid in the flow guide pipe and avoid environmental pollution; the discharge pipe arranged on the side wall of the liquid collecting container and the ball valve arranged on the discharge pipe can facilitate the collection and treatment of the corrosive liquid discharged at a fixed time, and the operation is convenient and safe. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The figure is a structural schematic view of the present application;

[0017] Figure 2 The figure is a structural schematic view of the liquid collection device of the present application;

[0018] Wherein: 1. boiler; 2. dust collector; 3. induced draft fan; 4. outlet flue; 5. flow guide pipe; 6. liquid collecting container; 7. desulfurization tower; 8. discharge pipe; 9. ball valve; 10. support. DETAILED DESCRIPTION

[0019] The present application will be described in detail below in combination with the drawings and specific embodiments.

[0020] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0021] This utility model discloses a system for reducing corrosion of induced draft fan impellers and dust collector filter bags in coal chemical thermal power plants, such as... Figure 1 As shown, it includes an induced draft fan 3 and a liquid collection device.

[0022] The induced draft fan 3 is used to draw the flue gas that has been dusted by the dust collector 2 from the boiler 1 into the outlet flue 4. The outlet flue 4 of the induced draft fan 3 is set at an angle upward. The lower end of the induced draft fan 3 is connected to the induced draft fan 3, and the upper end of the induced draft fan 3 is connected to the desulfurization tower 7. The outlet flue 4 is used to guide the flue gas into the desulfurization tower 7 so that the desulfurization tower 7 desulfurizes the flue gas and then discharges it.

[0023] The structure of the liquid collection device is as follows Figure 2 As shown, the liquid collection device is located on the ground below the outlet flue 4 and near the desulfurization tower 7, and includes a guide pipe 5 and a liquid collection container 6.

[0024] The guide pipe 5 is set vertically, with its upper end connected to the outlet flue 4 and its lower end connected to the liquid collection container 6. The guide pipe 5 is used to guide the corrosive liquid generated in the outlet flue 4 after it is cooled and condensed, and to allow the liquid to enter the liquid collection container 6.

[0025] The liquid collection container 6 is an open-top container. The top opening of the liquid collection container 6 is connected to the guide pipe 5 through a flange. A drain hole is provided on the side wall of the liquid collection container 6. A drain pipe 8 is provided on the liquid collection container 6. The drain pipe 8 is connected to the liquid collection container 6 through the drain hole. A ball valve 9 is installed on the drain pipe 8. The drain pipe 8 is used to periodically discharge corrosive liquid. A bracket 10 is fixedly connected to the bottom of the liquid collection container 6 to support the liquid collection container 6. By periodically discharging the liquid in the liquid collection container 6, the corrosion of the induced draft fan impeller and the dust collector bag by the corrosive liquid can be avoided.

[0026] The utility model discloses a flow guide pipe 5 is provided below the outlet flue 4, can in time with the liquid of corrosive that the outlet flue 4 in the cold condensation after producing is guided to the cold condensation after producing, prevents the liquid of corrosive into the induced draft fan 3 impeller, dust catcher cloth bag influence equipment normal operation.

[0027] The utility model discloses a liquid collecting container 6 is provided below the flow guide pipe 5, can collect the corrosive liquid in the flow guide pipe 5, avoid environmental pollution, install ball valve 9 on the discharge pipe 8 on the discharge pipe 8 side wall of liquid collecting container 6, convenient to collect and handle the corrosive liquid of regularly discharging, convenient operation, safety.

[0028] The above is only the preferred embodiment of the utility model, and does not restrict the utility model, and any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A system for reducing the corrosion of an induced draft fan impeller and dust collector cloth bags in a coal-fired power plant, characterized in that, The application relates to a boiler induced draft fan system. The boiler induced draft fan system comprises an induced draft fan (3) for extracting flue gas in a boiler (1) after dedusting by a dust remover (2) into an outlet flue (4); the outlet flue (4) of the induced draft fan (3) is arranged in an upward inclination, the low end of the outlet flue (4) is communicated with the induced draft fan (3), the high end of the outlet flue (4) is communicated with a desulfurization tower (7), the outlet flue (4) is used for guiding the flue gas into the desulfurization tower (7) so that the desulfurization tower (7) discharges the flue gas after desulfurization; The liquid collection device is arranged on the ground below the outlet flue (4) and close to the desulfurization tower (7) and comprises a flow guide pipe (5) and a liquid collecting container (6); the flow guide pipe (5) is vertically arranged, the upper end of the flow guide pipe (5) is communicated with the outlet flue (4), the lower end of the flow guide pipe (5) is communicated with the liquid collecting container (6), the flow guide pipe (5) is used for guiding the corrosive liquid produced after condensation of the flue gas in the outlet flue (4) and making the liquid enter the liquid collecting container (6); and the liquid in the liquid collecting container (6) is discharged at a fixed time, so that the corrosive liquid can not corrode the induced draft fan impeller and the dust remover bag.

2. The system for reducing the corrosion of the induced draft fan impeller and the dust collector cloth bag of the coal thermal power plant according to claim 1, characterized in that, The liquid collecting container (6) is an open-top container, the top opening of the liquid collecting container (6) is communicated with the flow guide pipe (5) through a flange.

3. The system for reducing the corrosion of the induced draft fan impeller and the dust collector cloth bag of the coal thermal power plant according to claim 1, characterized in that, A liquid discharging hole is arranged on the side wall of the liquid collecting container (6), a discharge pipe (8) is arranged on the liquid collecting container (6), the discharge pipe (8) is communicated with the liquid collecting container (6) through the liquid discharging hole, a ball valve (9) is arranged on the discharge pipe (8) and used for discharging the corrosive liquid at a fixed time.

4. The system for reducing the corrosion of the induced draft fan impeller and the dust collector cloth bag of the coal thermal power plant according to claim 1, characterized in that, A support (10) is fixedly connected to the bottom of the liquid collecting container (6) and used for supporting the liquid collecting container (6).

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