CN209968316U

CN209968316U - Flying dust curing system mixer removes dust and removes damp device

Info

Publication number: CN209968316U
Application number: CN201822263056.2U
Authority: CN
Inventors: 白力; 冯淋淋; 庞博; 舒伟康; 劳云枫; 陆钧皓; 刘露; 孙中涛; 刘焕联; 毛梦梅
Original assignee: Shanghai SUS Environment Co Ltd
Current assignee: Shanghai SUS Environment Co Ltd
Priority date: 2017-12-31
Filing date: 2018-12-31
Publication date: 2020-01-21
Anticipated expiration: 2028-12-31
Also published as: CN110201597A

Abstract

The utility model relates to the field of environmental protection equipment for stabilizing treatment of fly ash in a waste incineration plant, in particular to a dust and moisture removing device of a fly ash curing system stirrer, which comprises a stirrer, a fly ash weighing hopper, a solution weighing hopper, a Venturi negative pressure pipe and an air blower; the fly ash weighing hopper is arranged above the stirrer and is connected with a fly ash inlet of the stirrer through a valve and a pipeline; the solution weighing hopper is arranged above the stirrer and is connected with a solution inlet of the stirrer through a valve and a pipeline; a dry ash outlet with an opening at the upper part on one side of the stirrer is communicated with a negative pressure pipeline and is communicated with a fly ash weighing hopper through an air blower and a Venturi negative pressure pipe to form closed circulation; the moisture outlet of the upper opening on the other side of the stirrer is communicated with the negative pressure pipeline and the solution weighing hopper to form closed circulation. The utility model discloses avoid simultaneously forming the malleation in the mixer and lead to the flying dust to leak to the surrounding environment, reach and purify operation environment and reduce the inhalable particle risk of operating personnel.

Description

Flying dust curing system mixer removes dust and removes damp device

Technical Field

The utility model relates to a waste incineration factory flying dust stabilization handles the environmental protection equipment field, specifically is a flying dust solidification system mixer removes dust and removes damp device.

Background

Waste incineration generally consists of complex processes of heat transfer and mass transfer such as thermal decomposition, melting, evaporation and chemical reaction. A large amount of smoke is generated in the waste incineration process, and the smoke is treated by a smoke treatment and purification system (APC) and is discharged after reaching the standard. The fly ash is solid particles which are enriched by a dust removal device (a cyclone dust collector, an electrostatic dust collector or a bag type dust collector) in a flue gas treatment and purification system and a waste heat recycling system (such as a waste heat boiler and the like), and the particles contain a large amount of toxic and harmful substances such as heavy metal, dioxin and the like. Due to the characteristics of small density and small particle size of the fly ash, the fly ash is easy to leak to the surrounding environment in the transportation process, pollutes the environment and harms the health of field personnel.

At present, the fly ash solidification process of a waste incineration power plant has two modes, namely a mixing mill stirring continuous discharging mode and a stirrer intermittent discharging mode. Both methods are mixing the chelant diluent with fly ash in a stirring apparatus. Under increasingly strict standards, in order to ensure the qualification rate of each batch, the fly ash curing process of the existing waste incineration plants mostly adopts batch curing in an intermittent manner. And quantitatively weighing the fly ash and the solution, mixing and stirring in a stirrer, discharging to a ton bag for maintenance, and entering a landfill site for regional landfill after the detection is qualified. The process has the problems of large dust emission in the process of weighing and stirring the fly ash, and moisture is generated due to the heat generated by mixing oxide in the fly ash with water, and part of dry ash is mixed with the moisture to form pungent and corrosive dust-containing gas. When the blender is operated, positive pressure is formed inside the blender, resulting in gas leakage, corrosion of upstream equipment, environmental pollution and health threat to operators if the blender is discharged into the air.

At present, although each incineration plant and fly ash manufacturer have some corresponding measures for solving the problems, such as adding a dust remover, adding a flexible connection and a breathing cloth bag, dry ash leaks to different degrees from the field operation, and equipment is seriously corroded.

Based on the above problem, the utility model discloses the problem of the fly ash solidification system dust disposal flow of each domestic waste incineration plant, equipment lectotype and existence is considered comprehensively, utility model a fly ash solidification system mixer removes dust and removes damp device.

SUMMERY OF THE UTILITY MODEL

The patent of the utility model aims at providing a flying dust solidification system mixer removes dust and removes damp device prevents that the flying dust from weighing and stirring the in-process and leaking, gets rid of the corrosivity moisture that produces among the stirring process, realizes clear operational environment and extension equipment life.

The utility model discloses a concrete technical scheme is:

a fly ash solidification system stirrer dust and moisture removing device comprises a stirrer, a fly ash weighing hopper 6, a solution weighing hopper 7, a Venturi negative pressure pipe 1 and an air blower 2; the fly ash weighing hopper is arranged above the stirrer and is connected with a fly ash inlet of the stirrer through a valve and a pipeline; the solution weighing hopper 7 is arranged above the stirrer and is connected with a solution inlet of the stirrer through a valve and a pipeline;

a dry ash outlet 4 with an opening at the upper part on one side of the stirrer is communicated with a negative pressure pipeline and is communicated with a fly ash weighing hopper 6 through an air blower 2 and a Venturi negative pressure pipe 1 to form closed circulation;

a moisture outlet 5 with an opening at the upper part of the other side of the stirrer is communicated with a negative pressure pipeline and a solution weighing hopper 7 to form closed circulation.

When the fly ash and solution are stirred in the stirrer, calcium hydroxide, calcium chloride and other substances in the fly ash release heat when meeting water, and a part of dry ash is mixed to form corrosive moisture. Due to the positive pressure, the moisture generated in the mixing process flows into the solution weighing hopper through the moisture outlet at the upper part of the stirrer through the negative pressure pipeline, and the pressure balance of the system is maintained. After the solution completely enters the stirrer, the valve of the solution weighing hopper is closed, and after the product is discharged out of the stirrer, the operation is repeated. Thereby realizing the step-by-step dust and moisture removal.

Further, after the stirring is finished, the discharge door of the stirrer is opened, after the products are completely discharged, the discharge door is closed, the fly ash weighing hopper continues to discharge ash, and the dust removal operation is continued. And further the above operation is circulated.

The utility model solves the ash lifting phenomenon when the dry ash falls into the mixer through the cooperation of the air blower and the Venturi tube which are arranged on one side of the mixer; simultaneously through setting up the negative pressure pipeline connection of mixer opposite side to the moisture that produces when solution weighing device stirs in order to handle the mixer, avoid forming the malleation in the mixer simultaneously and lead to the fly ash to leak to the surrounding environment.

Drawings

Fig. 1 is a schematic flow chart of the present invention.

Figure 2 is a schematic diagram of a venturi in the apparatus of the present invention.

Wherein: 1. a venturi negative pressure tube; 2. a blower; 3. a valve; 4. a dry ash outlet (a hole at the upper part of the stirrer is communicated with a negative pressure pipeline); 5. a moisture outlet (an opening on the upper part of the stirrer is communicated with a negative pressure pipeline); 6, a fly ash weighing hopper; 7. the solution was weighed.

Detailed Description

Two mixers with the same specification are arranged in a fly ash treatment workshop of a household garbage incineration power plant. According to the figure 1 show install the utility model on one of them mixer additional after, two mixers all according to following mode operation three months:

1. the valve 3 of the fly ash weighing hopper 6 is opened, the fly ash falls into the stirrer 1 from top to bottom, the blower 2 is started, and the dry ash lifted up through the dry ash outlet 4 is brought back into the fly ash weighing hopper through the venturi by the blower.

2. After the fly ash completely falls into the stirrer, the valve 3 of the fly ash weighing hopper 6 and the air blower 2 are closed, the valve 3 of the solution weighing hopper 7 is opened at the same time, and the solution enters the stirrer from top to bottom to be mixed with the fly ash. The moisture generated in the mixing process flows into the solution weighing hopper 7 through the moisture outlet 5 on the upper part of the stirrer through a negative pressure pipeline, so that the step-by-step dust and moisture removal is realized. And 3, after all the solution enters the stirrer, closing the valve 3 of the solution weighing hopper 7, and after the product is discharged out of the stirrer, repeating the operation.

Fig. 2 is a schematic diagram of a venturi tube in the device of the present invention. The venturi tube is a pipeline which is contracted and then gradually expanded, dry ash enters an inlet, a contraction section, a throat and an outlet section from the air blower and enters the fly ash weighing hopper through the pipeline.

2 mixers were run for the same time under the same conditions as a control. The following data were obtained by field recording:

therefore, compared with the existing dust removal device of the stirrer, the dust removal and moisture removal device of the fly ash solidification system stirrer can better prevent the fly ash from leaking and create a clean operating environment; meanwhile, corrosive moisture generated during stirring is removed, the service life of the equipment is prolonged, and the operation cost is reduced.

In the process that the fly ash falls into the stirrer after being weighed, the air blower and the venturi are utilized to increase the air speed, so that negative pressure is formed in the pipe, dry ash leaked from the stirrer and the upper connection part is returned to the fly ash weighing device, and the process can accelerate the speed of the dry ash falling into the stirrer; and after the dry ash completely falls into the stirrer, turning off the air blower, starting the stirrer to mix and stir the fly ash and the solution, and introducing the generated moisture into the solution weighing device along with the negative pressure pipeline through an opening in the upper part of the stirrer. The utility model discloses an air-blower and venturi according to control logic order, through the air-blower blast air, utilize the venturi reducing principle with higher speed, will descend the flying dust that grey in-process leaked to enter the flying dust weighing device through the venturi reducing in, prevent that the dry ash from leaking. The fly ash does not pass through the fan in the process, so that the corrosion to fan equipment is reduced, and the service life is prolonged.

When the fly ash is mixed and stirred with the solution, substances such as calcium hydroxide, calcium chloride and the like in the fly ash release heat when meeting water, and corrosive moisture can be formed by mixing a part of dry ash. If the upstream and downstream equipment is not sealed, the gas can cause corrosion and cause the fly ash to harden at locations such as valves. The device introduces the corrosive moisture into the solution weighing device through a negative pressure pipeline. Because the solution weighing device is made of corrosion-resistant materials and the interior of the weighing device is in a humid environment, the hardening condition of the fly ash can be avoided.

In order to ensure that the fly ash is not leaked out to the maximum extent, the connection of upstream equipment of the stirrer is in hard connection, so that the use of soft connection is avoided, and the fly ash is prevented from leaking to the surrounding environment from the soft connection in the fly ash conveying process.

Claims

1. A dust and moisture removing device of a stirrer of a fly ash solidification system is characterized by comprising a stirrer, a fly ash weighing hopper (6), a solution weighing hopper (7), a Venturi negative pressure pipe (1) and an air blower (2); the fly ash weighing hopper is arranged above the stirrer and is connected with a fly ash inlet of the stirrer through a valve and a pipeline; the solution weighing hopper (7) is arranged above the stirrer and is connected with a solution inlet of the stirrer through a valve and a pipeline;

a dry ash outlet (4) with an opening at the upper part of one side of the stirrer is communicated with a negative pressure pipeline and is communicated with a fly ash weighing hopper (6) through an air blower (2) and a Venturi negative pressure pipe (1) to form closed circulation;

a moisture outlet (5) with an opening at the upper part of the other side of the stirrer is communicated with a negative pressure pipeline and a solution weighing hopper (7) to form closed circulation.