A slag conveying device with explosion-proof function

Abstract

The present invention discloses a slag conveying device with explosion-proof function, which relates to the technical field of slag conveying devices in thermal power plants. It includes a slag bin, a scraper slag conveyor and a bucket elevator. The output end of the scraper slag conveyor is connected to the input end of the bucket elevator, and the output end of the bucket elevator is connected to the slag bin. A transportation component is arranged above the scraper slag conveyor; an explosion-proof door is detachably installed on the scraper slag conveyor; and a fire extinguishing device is installed on the scraper slag conveyor. The transportation component includes a slag inlet pipe, and a slag inlet pipe for inputting hot slag into the scraper slag conveyor is installed on the housing of the scraper slag conveyor. By installing an explosion-proof door on the housing of the scraper slag conveyor, using the characteristics of non-woven fabric such as moisture-proof, breathable, flexible, light in weight and non-flammable, and cooperating with soft magnets to adsorb on the housing of the scraper slag conveyor, the carbon monoxide concentration in the scraper slag conveyor can be reduced to avoid explosion.

Description

Technical Field

[0001] The present invention relates to the technical field of slag conveying devices in thermal power plants, and particularly relates to a slag conveying device with explosion-proof function. Background Art

[0002] A thermal power plant, abbreviated as a coal-fired power plant, is a factory that uses combustibles (such as coal) as fuel to produce electric energy. Its basic production process is as follows: the fuel heats water to generate steam during combustion, converting the chemical energy of the fuel into heat energy. The steam pressure drives the steam turbine to rotate, converting heat energy into mechanical energy. Then the steam turbine drives the generator to rotate, converting mechanical energy into electric energy. The prime mover is usually a steam engine or a gas turbine. In some smaller power plants, an internal combustion engine may also be used. They all generate electricity by utilizing the pressure drop during the process of high-temperature, high-pressure steam or gas passing through the turbine to become low-pressure air or condensed water.

[0003] When the CFB boiler in a thermal power plant burns fuel, considering cost, a large amount of coal slime needs to be co-fired. Due to the incomplete combustion of coal slime, carbon monoxide is decomposed in the slag cooler and the scraper slag conveyor, and can form an explosive mixture when mixed with air. Therefore, internal deflagration events often occur in the slag conveying line of thermal power plants. Due to the self-flow of hot slag, a large amount of hot combustible gas-containing materials enter the scraper slag conveyor and are ignited by the high-temperature hot slag when mixed with the air inside the scraper slag conveyor. The high-temperature and high-pressure shock wave generated by the explosion will directly impact the shell of the scraper slag conveyor, causing the top plate to fly up and the shell to deform, and even injuring the staff, posing a certain safety hazard to the personal safety of the staff. For this reason, we propose a slag conveying device with explosion-proof function to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that explosions often occur in the scraper slag conveyor due to the incomplete combustion of coal slime in the prior art, and to propose a slag conveying device with explosion-proof function.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A slag conveying device with explosion-proof function, including a slag bin, a scraper slag conveyor and a bucket elevator. The output end of the scraper slag conveyor is connected to the input end of the bucket elevator, and the output end of the bucket elevator is connected to the slag bin.

[0007] A transportation component, arranged above the scraper slag conveyor; and

[0008] An explosion-proof door, detachably installed on the scraper slag conveyor; and

[0009] A fire extinguishing device, installed on the scraper slag conveyor.

[0010] Among them, the transportation component includes a slag inlet pipe, and a slag inlet pipe for inputting hot slag into the scraper slag conveyor is installed on the shell of the scraper slag conveyor.

[0011] Preferably, the explosion-proof door includes a magnetic strip arranged in a rectangular frame, the magnetic strip is adsorbed on the outer side wall of the scraper slag conveyor shell, a non-woven fabric is installed on the inner side wall of the magnetic strip, and the magnetic strip is a soft magnetic strip.

[0012] Preferably, a dust collector is installed on the top of the slag bin, and the dust collector is connected to the slag bin, the scraper slag conveyor and the bucket elevator respectively through a dust extraction pipe.

[0013] Preferably, the fire extinguishing device includes a carbon dioxide cylinder, a connecting pipe is installed on the carbon dioxide cylinder, one end of the connecting pipe penetrates through the shell of the scraper slag conveyor and a plurality of carbon dioxide nozzles are installed, an electromagnetic valve is installed on the connecting pipe, and a control device for controlling the electromagnetic valve is installed on the scraper slag conveyor.

[0014] Preferably, the control device includes a controller and a plurality of detectors installed in the scraper slag conveyor, and the controller is electrically connected to the detectors and the electromagnetic valve.

[0015] Preferably, the detectors are a carbon monoxide concentration monitor and a flame detector. Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. In the present invention, by installing an explosion-proof door on the shell of the scraper slag conveyor, and using the characteristics of the non-woven fabric such as moisture-proof, breathable, flexible, light in weight and non-flammable, and cooperating with the soft magnet to adsorb on the shell of the scraper slag conveyor, the carbon monoxide concentration in the scraper slag conveyor can be reduced, explosion can be avoided, and in addition, it can also play the role of filtering dust and avoid affecting the environment.

[0017] 2. In the present invention, by setting a controller, a carbon dioxide cylinder, a connecting pipe, detectors, an electromagnetic valve and carbon dioxide nozzles, when the detectors detect a flame in the scraper slag conveyor, the electromagnetic valve can be automatically opened, so that carbon dioxide enters the scraper slag conveyor to extinguish the fire with carbon dioxide or isolate oxygen. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of a slag conveying device with explosion-proof function proposed by the present invention;

[0019] Figure 2 is Figure 1 the structural schematic diagram at A in

[0020] Figure 3 is a schematic connection structure diagram of a scraper slag conveyor and an explosion-proof door in a slag conveying device with explosion-proof function proposed by the present invention;

[0021] Figure 4 This is a control relationship diagram among the controller, solenoid valve, and detector in a slag conveying device with an explosion-proof function proposed by the present invention.

[0022] In the figure: 1. slag bin; 2. scraper slag conveyor; 3. carbon dioxide cylinder; 4. connecting pipe; 5. solenoid valve; 6. controller; 7. explosion-proof door; 701. non-woven fabric; 702. magnetic strip; 8. dust extraction pipe; 9. bucket elevator; 10. dust collector; 11. carbon dioxide nozzle; 12. slag inlet pipe. Specific Embodiment

[0023] The present invention will be further described in detail below with reference to the accompanying drawings.

[0024] Among them, the same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper", and "lower" used in the following description refer to the directions in the drawings, and the terms "bottom surface" and "top surface", "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component.

[0025] Embodiment 1

[0026] Referring to Figures 1-4 , a slag conveying device with an explosion-proof function includes:

[0027] A slag bin 1, a scraper slag conveyor 2, and a bucket elevator 9. The output end of the scraper slag conveyor 2 is connected to the input end of the bucket elevator 9, and the output end of the bucket elevator 9 is connected to the slag bin 1. A slag inlet pipe 12 for inputting hot slag into the scraper slag conveyor 2 is installed on the housing of the scraper slag conveyor 2, and a plurality of detachable explosion-proof doors 7 are installed on the scraper slag conveyor 2;

[0028] The explosion-proof door 7 includes a magnetic strip 702 arranged in a rectangular frame, the magnetic strip 702 is adsorbed on the outer side wall of the housing of the scraper slag conveyor 2, and a non-woven fabric 701 is installed on the inner side wall of the magnetic strip 702.

[0029] By installing the explosion-proof door 7 on the housing of the scraper slag conveyor 2, using the characteristics of the non-woven fabric 701 such as moisture-proof, breathable, flexible, light in weight, and non-combustible, and cooperating with the soft magnet to be adsorbed on the housing of the scraper slag conveyor 2, the carbon monoxide concentration in the scraper slag conveyor 2 can be reduced. Even when an explosion occurs, due to the light weight of the non-woven fabric 701, it is first blown open, avoiding the deformation of the housing of the scraper slag conveyor 2 under pressure.

[0030] In addition, the non-woven fabric 701 is fixed on the housing of the scraper slag conveyor 2 by the adsorption of the magnetic strip 702. When an explosion occurs, the non-woven fabric 701 is more easily blown open, avoiding the deformation of the housing of the scraper slag conveyor 2 under pressure. It can not only play a role in fixing the non-woven fabric 701, but also play a role in protecting the housing of the scraper slag conveyor 2.

[0031] In the present invention, more specifically, external air can also enter the scraper slag conveyor 2 through the non-woven fabric 701, reducing the concentration of carbon monoxide and preventing explosion. In addition, it has good air permeability and can also filter the air entering the scraper slag conveyor 2 to prevent dust from entering the scraper slag conveyor 2 and prevent dust explosion.

[0032] The non-woven fabric 701 is light in weight and is adsorbed on the shell of the scraper slag conveyor 2 through the magnetic strip 702. If an explosion occurs inside the scraper slag conveyor 2, the non-woven fabric 701 will be first blown open, avoiding deformation of the shell of the scraper slag conveyor 2 due to pressure.

[0033] In the present invention, more specifically, the magnetic strip 702 is a soft magnetic strip, which has better applicability and can be bent. In addition, using the magnetic strip 702 to fix the non-woven fabric 701 makes it more convenient to replace the explosion-proof door 7.

[0034] In the present invention, more specifically, a dust collector 10 is installed on the top of the slag bin 1. The dust collector 10 is connected to the slag bin 1, the scraper slag conveyor 2, and the bucket elevator 9 through the dust extraction pipe 8 respectively.

[0035] The function of the dust collector 10 is to extract the dust in the slag bin 1, the scraper slag conveyor 2, and the bucket elevator 9, avoiding dust explosion and playing a role in protecting the shell of the scraper slag conveyor 2.

[0036] In the present invention, more specifically, a fire extinguishing device is also installed on the scraper slag conveyor 2. The fire extinguishing device includes a carbon dioxide cylinder 3. A connecting pipe 4 is installed on the carbon dioxide cylinder 3. One end of the connecting pipe 4 penetrates the shell of the scraper slag conveyor 2 and is installed with a plurality of carbon dioxide nozzles 11. An electromagnetic valve 5 is installed on the connecting pipe 4. A control device for controlling the electromagnetic valve 5 is installed on the scraper slag conveyor 2.

[0037] The control device includes a controller 6 and a plurality of detectors installed inside the scraper slag conveyor 2. The controller 6 is electrically connected to the detectors and the electromagnetic valve 5. The detectors are a carbon monoxide concentration monitor and a flame detector. The carbon monoxide concentration monitor can monitor the carbon monoxide concentration inside the scraper slag conveyor 2 in real time. When the carbon monoxide concentration exceeds the threshold, the controller 6 issues an instruction to control the opening of the electromagnetic valve 5. When the electromagnetic valve 5 is opened, the carbon dioxide in the carbon dioxide cylinder 3 is sprayed into the scraper slag conveyor 2 through the connecting pipe 4 and the carbon dioxide nozzles 11, which can play a role in isolating oxygen and preventing explosion.

[0038] The flame detector can play a role in real-time monitoring of the flame. When the flame detector detects a flame in the scraper slag conveyor 2, the flame detector transmits the detection result to the controller 6. The controller 6 issues an instruction to control the opening of the solenoid valve 5. When the solenoid valve 5 is opened, the carbon dioxide in the carbon dioxide cylinder 3 is sprayed into the scraper slag conveyor 2 through the connecting pipe 4 and the carbon dioxide nozzle 11, which can play a role in carbon dioxide fire extinguishing or oxygen isolation, avoiding explosion.

[0039] The functional principle of the present invention can be elaborated through the following operation modes:

[0040] In the present invention, the hot slag after combustion enters the scraper slag conveyor 2 through the slag inlet pipe 12 and is conveyed to the bucket elevator 9 by the scraper slag conveyor 2. The bucket elevator 9 conveys the hot slag to the slag bin 1. When the scraper slag conveyor 2 conveys the hot slag, the flame detector monitors the inside of the scraper slag conveyor 2 in real time. When the flame detector detects a flame in the scraper slag conveyor 2, the flame detector transmits the detection result to the controller 6. The controller 6 issues an instruction to control the opening of the solenoid valve 5. When the solenoid valve 5 is opened, the carbon dioxide in the carbon dioxide cylinder 3 is sprayed into the scraper slag conveyor 2 through the connecting pipe 4 and the carbon dioxide nozzle 11, which can play a role in carbon dioxide fire extinguishing or oxygen isolation, avoiding explosion.

[0041] The above shows and describes the basic principle, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A slag conveying device with explosion-proof function, comprising a slag bin (1), a scraper slag conveyor (2) and a bucket elevator (9), wherein the output end of the scraper slag conveyor (2) is connected to the input end of the bucket elevator (9), and the output end of the bucket elevator (9) is connected to the slag bin (1), and is characterized in that: a transportation component, arranged above the scraper slag conveyor (2); and an explosion-proof door (7), detachably installed on the scraper slag conveyor (2); and a fire extinguishing device, installed on the scraper slag conveyor (2), wherein the transportation component includes a slag inlet pipe (12), and the slag inlet pipe (12) for inputting hot slag into the scraper slag conveyor (2) is installed on the housing of the scraper slag conveyor (2); the explosion-proof door (7) includes a magnetic strip (702) arranged in a rectangular frame, the magnetic strip (702) is adsorbed on the outer side wall of the housing of the scraper slag conveyor (2), a non-woven fabric (701) is installed on the inner side wall of the magnetic strip (702), and the magnetic strip (702) is a soft magnetic strip; a dust collector (10) is installed on the top of the slag bin (1), and the dust collector (10) is connected to the slag bin (1), the scraper slag conveyor (2) and the bucket elevator (9) respectively through a dust extraction pipe (8). the fire extinguishing device includes a carbon dioxide cylinder (3), a connecting pipe (4) is installed on the carbon dioxide cylinder (3), one end of the connecting pipe (4) penetrates through the housing of the scraper slag conveyor (2) and a plurality of carbon dioxide nozzles (11) are installed, a solenoid valve (5) is installed on the connecting pipe (4), and a control device for controlling the solenoid valve (5) is installed on the scraper slag conveyor (2).

2. The slag conveying device with explosion-proof function according to claim 1, wherein, the control device includes a controller (6) and a plurality of detectors installed in the scraper slag conveyor (2), and the controller (6) is electrically connected to the detectors and the solenoid valve (5).

3. The slag conveying device with explosion-proof function according to claim 2, characterized in that, the detectors are a carbon monoxide concentration monitor and a flame detector.

4. The slag conveying device with explosion-proof function according to claim 3, characterized in that, ​

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