CN110090523A - One kind being used for the quenched reforming apparatus of sintering flue gas - Google Patents

Abstract

A device for tempering and modifying sintering flue gas, including a powder bin, which is connected to the compressed air system through pipelines. The pipeline at the bottom of the powder bin has a manual sliding door and a rotary feeding valve. The rotary feeding valve is connected to the The injector is connected, the injector is connected with the fan, the natural wind from the fan is mixed with the tempered powder in the powder bin in the injector; the injector is also connected with the gas distributor through the pipeline, and the gas distributor is connected with the powder spray gun Connection, the powder spray gun is connected with the compressed air system and installed on the flue before the denitrification of the sintering flue gas. Through the sintering flue gas conditioner device, the problem of soot in the sintering flue gas melting and bonding at high temperature and blocking the catalyst is effectively solved, and at the same time, the safe and stable operation of the sintering flue gas SCR denitrification system is guaranteed, and the denitrification efficiency of SCR is guaranteed. Ensure the safe and stable operation of the sintering machine system, so that the NOx of the sintering flue gas can meet the emission standards required by the environmental protection department.

Description

A device for conditioning and tempering modification of sintering flue gas

technical field

The invention relates to the technical field of flue gas treatment, in particular to a conditioning and tempering device for sintering flue gas.

Background technique

The mainstream process of sintering flue gas denitrification adopts SCR (Selective Catalytic Reduction Technology) denitrification process. Because the temperature of sintering flue gas is low, it cannot meet the temperature requirements of SCR denitrification. It is necessary to heat the flue gas to about 300°C. A large amount of alkali metal substances such as Na + and K + contained in the gas will melt at high temperature, and the smoke and dust will bond and bridge.

Sintering flue gas denitrification has just started in China, and there are only a few companies in the world that have denitrified sintering flue gas. It can be said that sintering flue gas denitrification is in the exploratory stage, and there is no mature technical experience for reference. The national policy requires that denitrification of sintering flue gas must be carried out. In this context, only power plant flue gas denitrification technology can be used. Due to the great difference in the characteristics of the two flue gases, after the completion and operation of sintering flue gas denitrification, problems such as blockage will occur, seriously affecting The denitrification efficiency and the safe and stable operation of the sintering machine.

Faced with this problem that needs to be solved urgently, measures such as interception and increased blowing intensity have certain effects on catalyst clogging, but the effect is very small, and the clogging problem cannot be fundamentally solved. Purely mechanical measures cannot solve the problem of sticky clogging.

At present, there is no technology of conditioning and tempering denitrification flue gas in China, and the present invention fundamentally solves the technology of sintering flue gas melting and lapping and clogging the catalyst at high temperature.

Contents of the invention

In order to overcome the problems in the prior art, the present invention provides a device for tempering and modifying sintering flue gas.

The technical solution adopted by the present invention to solve the technical problem is: the device for tempering and modifying sintering flue gas includes a powder bin, which is connected to the compressed air system through a pipeline, and there is a manual plug on the pipeline at the bottom of the powder bin. The plate door and the rotary feed valve, the rotary feed valve is connected with the injector, the injector is connected with the fan, the natural wind from the fan is mixed with the tempered powder in the powder bin in the injector; the injector is also connected with the air through the pipeline The uniform distributor is connected, the gas distributor is connected with the powder spray gun, the powder spray gun is connected with the compressed air system and installed on the flue before the sintering flue gas denitrification.

Further, a bag filter is installed on the top of the powder bin.

Further, an electric heater is installed on the pipeline between the compressed air system and the powder bin.

Further, the rotary feeding valve is frequency-variable, arranged on the upper part of the jet pump, and sends the powder from the powder bin into the jet evenly and quantitatively.

Further, a fluidization device is provided at the bottom of the powder silo, and the fluidization device includes fluidization plates evenly distributed at the bottom of the powder silo, and a switch valve is provided corresponding to each fluidization plate, and the wind from the compressed air system passes through the fluidization plate to the powder. The powder in the bin is fluidized.

Further, the blower is a Roots blower, and there are two Roots blowers, and the two Roots blowers are connected to the injector through a pipeline.

In summary, the beneficial effects of the technical solution of the present invention are as follows:

Through the sintering flue gas conditioner device, the problem of soot in the sintering flue gas melting and bonding at high temperature and blocking the catalyst is effectively solved, and at the same time, the safe and stable operation of the sintering flue gas SCR denitrification system is guaranteed, and the denitrification efficiency of SCR is guaranteed. Ensure the safe and stable operation of the sintering machine system, so that the NOx of the sintering flue gas can meet the emission standards required by the environmental protection department.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a schematic diagram of the installation position relationship between the spray gun and the flue gas pipe.

In the picture:

1. Roots blower, 2. Ejector 3. Rotary feeding valve, 4. Manual sliding door, 5. Fluidization device, 6. Powder bin, 7. Bag filter, 8. Gas uniform distributor, 9. Spray gun, 10. Electric heater, 11. Compressed air system, 12. Flue.

Detailed ways

The features and principles of the present invention will be described in detail below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, not to limit the protection scope of the present invention.

As shown in Figure 1 and Figure 2, this kind of device for sintering flue gas conditioning and modification includes a powder bin 6, which is connected to the compressed air system 11 through pipelines, and there is a manual insert on the pipeline at the bottom of the powder bin 6 Plate door 4 and rotary feed valve 3, rotary feed valve 3 is connected with injector 2, injector 2 is connected with fan, the natural wind from fan is mixed with the tempered powder in powder bin 6 in injector 2; The injector 2 is also connected to the gas distributor 8 through the pipeline, the gas distributor 8 is connected to the powder spray gun 9, and the powder spray gun 9 is connected to the compressed air system 11 and installed on the flue 12 before the sintering flue gas denitrification.

A bag filter 7 is installed on the top of the powder bin 6 .

An electric heater 10 is installed on the pipeline between the compressed air system 11 and the powder bin 6 , and the electric heater 10 passes into the powder bin 6 after heating the compressed air from the compressed air system 11 .

A fluidization device 5 is arranged at the bottom of the powder bin 6, and the fluidization device 5 includes a fluidization plate evenly distributed at the bottom of the powder bin 6, and an on-off valve is provided corresponding to each fluidization plate, and the wind from the compressed air system 11 passes through the fluidization plate to the powder. The powder in bin 6 is fluidized.

The rotary feeding valve 3 is frequency-converted, and is arranged on the upper part of the jet pump, and sends the powder from the powder bin 6 into the injector 2 evenly and quantitatively.

The blower is a Roots blower 1, and the Roots blower 1 includes two sets, and the two Roots blowers 1 are connected to the ejector 2 through a pipeline.

How the device works:

The conditioner powder is stored in the powder bin 6, and the system adopts dilute phase transportation (when the velocity of the fluidized medium is high, the solid particles begin to be carried out. As the velocity of the fluidized medium increases, more particles are entrained; this When the void ratio increases, the pressure drop decreases; the solid particles form a suspended dilute phase in the fluid, and are entrained out of the fluidized bed together with the fluid. This stage is called the airflow conveying stage, also known as dilute phase conveying), There are two Roots blowers 1 for transporting conditioner powder, the natural wind from Roots blower 1 and the conditioner powder are in the ejector 2 (ejector 2, also known as: ejector, jet vacuum pump, Jet vacuum ejector 2, jet pump, water ejector 2, and vacuum ejector 2 are vacuum obtaining devices that use fluid to transfer energy and quality. out, aggregated at a focal point; due to the particularly high flow rate of the jet water, the pressure energy is converted into velocity energy, so that the pressure in the suction area is reduced to generate a vacuum) and mixed in, under the action of the Roots blower 1, the ejector is blown at a certain speed 2, the jet pump sprays out, and transports it to the gas uniform distributor 8 through the delivery pipeline, and evenly distributes the powder-air mixture into the powder spray gun 9. At the same time, the powder spray gun 9 is also provided with a compressed air interface. The function of the compressed air is to atomize the powder-air mixture into fine particles. The tempering powder particles react quickly with the dust in the flue gas, and the purpose of dust modification is completed in a short time.

The powder spray gun 9 is a dual-fluid spray gun 9, and is provided with two interfaces, one is a powder-air mixture interface, and the other is a compressed air interface. A fluidization device 5 is installed at the bottom of the conditioner powder bin 6, and the fluidization wind heated by the electric heater 10 fluidizes the powder through the fluidization plate to prevent the powder from compacting in the bin and the system operates.

The spray gun 9 is arranged on the wall of the flue before entering the SCR reactor. The arrangement on the flue needs to be simulated on the flow field. The quantity, layout and installation form must meet the requirements of the flow field, so as to ensure that the powder-gas mixture can flow in the flue. The flue gas in the flue gas is in contact with the largest area and mixed as evenly as possible.

The powder jet atomizer is arranged on the flue gas wall according to the flow field simulation. The gas-powder mixture entering the powder atomization device is atomized into fine particles under the action of compressed air and sprayed into the flue. The soot in the flue gas is uniformly mixed. Under the action of the conditioner, the soot characteristics of the sintering flue gas are modified. The original sintering soot is melted and bonded at high temperature, and after modification, it is no longer bonded and has good fluidity. The device can effectively change the characteristics of the soot in the sintering flue gas, thereby avoiding the problem of the sintering fume bonding and bridging at high temperature, and easily blocking the catalyst, and ensuring the normal and efficient operation of the sintering flue gas SCR denitrification system.

The sintering flue gas conditioning modification device can effectively change the melting and bonding characteristics of Na+, K+ and other alkali metal substances in the sintering flue gas at high temperature, and the flue dust will change from the original bonding bridging to good fluidity and non-sticking It is not sticky, and can easily pass through the catalyst pores, thus avoiding the blockage of the catalyst and the deactivation of the catalyst to reduce the denitrification efficiency, ensuring the normal and efficient operation of the sintering flue gas SCR denitrification system and the sintering machine system.

The above-mentioned embodiments are only descriptions of preferred implementations of the present invention, and are not intended to limit the scope of the present invention. On the premise of not departing from the design spirit of the present invention, those skilled in the art should make various modifications and improvements of the present invention. Into the scope of protection defined by the claims of the present invention.

Claims (6)

1. A device for tempering and modifying sintering flue gas, which is characterized in that it includes a powder bin, which is connected to the compressed air system through a pipeline, and there is a manual sliding door and a rotary feeding valve on the pipeline at the bottom of the powder bin , the rotary feeding valve is connected to the injector, and the injector is connected to the fan, and the natural wind from the fan is mixed with the tempered powder in the powder bin in the injector; The distributor is connected with the powder spray gun, and the powder spray gun is connected with the compressed air system and installed on the flue before denitrification of the sintering flue gas. 2 . The device for tempering and modifying sintering flue gas according to claim 1 , wherein a bag filter is installed on the top of the powder bin. 3 . 3. A device for tempering and modifying sintering flue gas according to claim 1, characterized in that an electric heater is installed on the pipeline between the compressed air system and the powder bin. 4. A device for conditioning and tempering modification of sintering flue gas according to claim 1, characterized in that, the rotary feed valve is frequency-converted, arranged on the upper part of the jet pump, and evenly distributes the powder from the powder bin Quantitatively fed into the injector. 5. A device for conditioning and tempering modification of sintering flue gas according to claim 1, characterized in that a fluidization device is provided at the bottom of the powder bin, and the fluidization device includes fluidization plates evenly distributed at the bottom of the powder bin , Corresponding to each fluidizing plate is equipped with a switch valve, the wind from the compressed air system fluidizes the powder in the powder bin through the fluidizing plate. 6. A kind of device for sintering flue gas conditioning and tempering modification according to claim 1, is characterized in that, described blower fan is Roots blower, and Roots blower comprises two, and two Roots blowers pass pipeline and jet device connection.