Recycling and absorbing device for long-distance conveying of gravity dedusting ash of European smelting furnace

Abstract

Crude gas generated by a gasification furnace of the European smelting furnace is subjected to coarse dust removal through gravity dust removal, the dust removal ash is discharged to a gravity dust storage tank on the lower portion through a dust discharging valve, a material level meter of a tank body is remotely observed, a high material level is achieved, the dust discharging valve is closed, and the dust removal ash is discharged to the gravity dust storage tank through the dust discharging valve. A tank body pressure display device is remotely observed, a tank body blow-off valve is closed, the nitrogen pressure of a nitrogen source is adjusted to 0.8 MPa through a nitrogen pressure adjusting device, an in-tank stamping device 10 is started to stamp the interior of the tank to 0.8 MPa, a lower fluidization ash conveying device is started to adjust nitrogen to 0.6 MPa, the nitrogen pressure is adjusted to 0.1-0.3 MPa through an ash conveying pipe and an ash conveying device, and the nitrogen pressure is adjusted to 0.8 MPa through a nitrogen pressure adjusting device. And dense phase conveying is started, gravity ash is conveyed to a raw coal bunker of the coal injection system, and ash conveying is stopped after the ash is conveyed to the low material level. And ash conveying nitrogen is connected to the environment dust removal bag box body through a pipeline and is discharged by the environment dust removal bag box body.

Description

Technical Field

[0001] The invention relates to a recovery and disposal device for long-distance transportation of gravity dust removal ash from an Ouye furnace. Background Art

[0002] The coal gas from the reduction furnace top of Ouye furnace is purified by gravity dust removal + bag dry dust removal. Affected by the fuel structure, the amount of dust removal is large, and the gravity dust removal per ton of iron reaches about 30kg / tHM. Due to the high carbon content, fine particle size of 300-450 mesh, and poor hydrophilicity of the gravity dust removal ash of Ouye furnace, it is easy to raise dust when discharged, and it is difficult to recycle and dispose. The gravity dust removal ash is humidified by a mixer and then discharged to the open ash receiving car. Due to the fine particle size and poor hydrophilicity of the gravity ash, a large amount of dust is generated during discharge, polluting the environment. Summary of the invention

[0003] In order to solve the technical problem that gravity ash has fine particle size and poor hydrophilicity, and causes a large amount of dust when discharged, posing a great environmental risk, the present invention provides a recovery and disposal device for long-distance transportation of gravity dust removal ash from Ouye furnace.

[0004] The technical solution adopted by the present invention is: a recovery and disposal device for long-distance transportation of gravity dust removal ash from an Ouye furnace, comprising an Ouye furnace gasifier, the raw coal gas transmission pipe of the gasifier is connected to a gravity dust collector, the bottom of the gravity dust collector is connected to a gravity ash storage tank through an ash unloading valve, the gravity ash storage tank is respectively provided with a high level meter and a low level meter, a tank body release valve, a tank body pressure display device and a tank internal stamping device, a fluidized ash conveying device is arranged at the bottom of the gravity ash storage tank, the fluidized ash conveying device is connected to the raw coal bunker of the coal injection system through an ash conveyor device, an environmental dust removal bag box is arranged on the top of the raw coal bunker, a nitrogen pressure regulating device connected to a nitrogen source is also arranged at the bottom of the fluidized ash conveying device, and the outlet ends of the nitrogen pressure regulating device are respectively connected to the tank internal stamping device and the fluidized ash conveying device.

[0005] Remotely observe the tank level meter, when it reaches the high material level, close the ash discharge valve, remotely observe the tank pressure display device, close the tank release valve, adjust the nitrogen pressure of the nitrogen source to 0.8MPa through the nitrogen pressure regulating device, open the punching device 10 in the tank to punch the tank to 0.8MPa, open the lower fluidized ash conveying device to adjust the nitrogen to 0.6MPa, the ash conveying pipe and ash conveyor device adjust the nitrogen pressure to 0.1-0.3MPa, start dense phase conveying to convey gravity ash to the raw coal bunker of the coal injection system, and stop conveying ash after conveying to the low material level. Ash conveying nitrogen is connected to the environmental dust bag box through a pipeline and discharged from the environmental dust bag box. The gravity dust ash inside the raw coal bunker is mixed with the raw coal for pulverization and then sprayed back into the Ouye furnace gasifier. The gravity ash ash of the specific gravity ash conveying system enters the lower gravity ash storage tank through the ash discharge pipeline of 3 groups of ash discharge valves. The lower part of the ash storage tank is equipped with a fluidizing device, an ash conveying pipe and an ash conveyor device. The gravity ash is transported to the coal injection raw coal bunker through the DN80 ash conveying pipeline by the upper discharge method. The upper part of the gravity ash storage tank is equipped with a tank valve release (used for pressure relief during maintenance of the ash storage tank) and a tank punching device, 2 high and low level gauges, a pressure display device on the tank body, and a fluidizing ash conveying device, an ash conveying pipe and an ash conveyor device at the bottom. The distance from the gravity ash conveying described here to the raw coal bunker for coal injection is 500m, and the gas source is provided with pressure and flow by the nitrogen source system.

[0006] The specific nitrogen source system provides 0.8MPa nitrogen pressure, and the pressure is adjustable. Main user units: nitrogen for gravity ash conveying system punching, nitrogen pressure 0.8MPa, nitrogen for fluidization, nitrogen pressure 0.6MPa, nitrogen for ash conveying, nitrogen pressure 0.1-0.3MPa, the nitrogen pressure is regulated by the pressure reducing flow control valve at each gas point.

[0007] In the specific coal injection receiving system, dust ash enters from the top of the raw coal bin and is deposited by gravity. The ash-transporting nitrogen is connected to the raw coal bin and the environmental dust bag box through a pipeline and is discharged from the environmental dust bag box.

[0008] According to the process operation requirements, the present invention provides a long-distance conveying gravity dust removal ash recovery and disposal device, which is improved through the remote operation system, and the functions of remote operation by personnel are as follows: the three groups of ash unloading valves of the gravity ash conveying system discharge the gravity ash to the lower gravity ash storage tank through the remote operation switch, remotely observe the tank high level meter, reach the high level, close the three groups of ash unloading valves, remotely observe the tank pressure display device, open the stamping device in the tank to stamp into the tank and stabilize it at 0.6MPa, remotely operate the lower fluidized ash conveying device, ash conveying pipe and ash conveyor device, convey the gravity ash to the coal injection raw coal bin, stop conveying after the ash is conveyed to the low level, remotely adjust the nitrogen source system to provide pressure and flow, and the above operations can be cycled remotely.

[0009] The present invention has the following beneficial effects: (1) It meets the requirement of stable operation of the gas system of the Ouye furnace. The dust can be discharged from the gravity system quickly and uninterruptedly during the operation time, eliminating the uncertain disadvantages of vehicle transportation, which is beneficial to the purification efficiency of the gas dust removal system. (2) It reduces the cost requirements. The gravity dust of the Ouye furnace contains about 50% carbon and about 20% iron. The discharge from the Ouye furnace is actually a waste of C and Fe elements, which increases the production cost. The dust does not leave the factory and is recycled in the factory, which reduces the consumption of C and Fe elements in the raw fuel, improves the molten iron recovery rate, reduces the fuel ratio, ore consumption, and reduces production costs. (3) The environment is good for the development of metallurgy. Disadvantages of the discharge of dust: Gravity ash under the gravity dust collector generates dust, forming a pollution source. Gravity ash needs to be transported by vehicles, which causes a certain amount of dust at the ash unloading point. The transportation cost and energy consumption are high, which is the source of environmental pollution. After pipeline transportation, closed-circuit output effectively eliminates environmental risks and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present invention will be further described below in conjunction with the accompanying drawings.

[0011] Figure 1 It is a schematic diagram of the connection structure of the present invention. Implementation

[0012] The present invention provides a long-distance conveying gravity dust collection and disposal device, such as Figure 1 As shown in the figure, the raw gas produced by Ouye furnace gasification furnace 1 contains 20-30g / m 3 , rough dust removal is performed through the gravity dust collector 2. The dust removed by the gravity dust collector 2 is deposited at the bottom and discharged to the lower gravity ash storage tank 4 through the ash discharge valve 3. The tank high material level meter 5 is remotely observed. When the high material level is reached, the ash discharge valve 3 is closed, the tank pressure display device 9 is remotely observed, and the tank release valve 11 is closed. The nitrogen pressure of the nitrogen source 12 is adjusted to 0.8MPa through the nitrogen pressure regulating device 13, and the punching device 10 in the tank is opened to punch the tank to 0.8MPa. The lower fluidized ash conveying device 7 is opened to adjust the nitrogen to 0.6MPa. The ash conveying pipe and ash conveyor device 8 adjust the nitrogen pressure to 0.1-0.3MPa, and the dense phase conveying is started to convey the gravity ash to the raw coal bunker 15 of the coal injection system 16. When the ash is conveyed to the low material level meter 6, the ash conveying is stopped. The ash conveying nitrogen is connected to the environmental dust bag box 14 through a pipeline and discharged from the environmental dust bag box 14. The gravity dust in the raw coal bin 15 is mixed with the raw coal and pulverized and then sprayed back into the Ouye furnace gasifier.

Claims

1. A recovery and disposal device for long-distance transportation of gravity dust removal ash from an Ouye furnace, comprising an Ouye furnace gasification furnace, characterized in that: The raw coal gas transmission pipe of the gasifier is connected to the gravity dust collector, and the bottom of the gravity dust collector is connected to the gravity ash storage tank through an ash discharge valve. The gravity ash storage tank is respectively provided with a high level meter and a low level meter, a tank body release valve, a tank body pressure display device and a tank internal punching device. A fluidized ash conveying device is arranged at the bottom of the gravity ash storage tank. The fluidized ash conveying device is connected to the raw coal bunker of the coal injection system through an ash conveyor device. An environmental dust removal bag box is arranged on the top of the raw coal bunker. A nitrogen pressure regulating device connected to a nitrogen source is also arranged at the bottom of the fluidized ash conveying device, and the outlet ends of the nitrogen pressure regulating device are respectively connected to the tank internal punching device and the fluidized ash conveying device.

Images