Primary flue gas stabilizing and pressurizing device of electric furnace flue gas deep purification system

Abstract

The utility model provides a primary flue gas stable supercharging device of an electric furnace flue gas deep purification system, which comprises a combustion settling chamber, a quench tower, an activated carbon ejector, a bag-type dust collector, a dust removal fan and a chimney which are connected in sequence, the waste heat boiler, the dioxin catalytic degradation synergistic denitration reactor and the primary flue gas booster fan are arranged between the quench tower and the activated carbon ejector and are connected in series; the first auxiliary gas conveying pipe is arranged between the quench tower and the dioxin catalytic degradation synergistic denitration reactor and is connected with the waste heat boiler in parallel; and the second auxiliary gas conveying pipe is arranged between the quench tower and the activated carbon ejector and is connected with the waste heat boiler, the dioxin catalytic degradation synergistic denitration reactor and the primary flue gas booster fan in parallel. According to the utility model, the newly increased resistance of the waste heat boiler and the dioxin catalytic degradation synergistic denitration reactor is accurately overcome, and the purpose of no influence on the stable operation of secondary flue gas and tertiary flue gas is achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of electric furnace flue gas deep purification, especially relates to an electric furnace flue gas deep purification system primary flue gas stable pressure increasing device. BACKGROUND

[0002] The NOx emission of ton steel of short process steelmaking is far lower than that of long process steelmaking. Specifically, the NOx emission of ton steel of short process steelmaking is only about 21% of that of long process steelmaking containing sintering process. Although the NOx emission of short process steelmaking is relatively low, due to the influence of production process, equipment condition and operation level and other factors, the NOx emission concentration of primary flue gas of short process steelmaking electric furnace fluctuates to a certain extent, especially in the initial section of the melting furnace working condition and the melting furnace, the NOx emission concentration is high and presents a short-time rapid fluctuation condition (peak value is more than 200mg / Nm 3 ), and the emission concentration is low (less than 50mg / Nm 3 ) in most other conditions. This condition is generally not suitable for setting a separate denitration treatment device.

[0003] In view of the above conditions, in order to realize the deep purification of electric furnace flue gas coupled with waste heat utilization, a waste heat boiler and a dioxin catalytic degradation and denitration reactor can be added in the primary flue gas process path. However, it is a new technical problem to overcome the newly added resistance and achieve the purpose of basically having no influence on the stable operation of secondary flue gas and tertiary flue gas. UTILITY MODEL CONTENTS

[0004] An object of the utility model is to provide an electric furnace flue gas deep purification system primary flue gas stable pressure increasing device, and provide at least the advantages to be explained later.

[0005] Another object of the utility model is to provide an electric furnace flue gas deep purification system primary flue gas stable pressure increasing device, which overcomes the newly added resistance by precisely controlling the pressure difference before the quenching tower and before the booster fan, and achieves the purpose of basically having no influence on the stable operation of secondary flue gas and tertiary flue gas, thereby improving the practicality of the device in use.

[0006] The technical scheme of the utility model is as follows:

[0007] The electric furnace flue gas deep purification system primary flue gas stable pressure increasing device comprises a combustion settling chamber and a quenching tower, an activated carbon injector, a bag-type dust collector, a dust removal fan and a chimney connected in sequence, and further comprises:

[0008] A waste heat boiler, a dioxin catalytic degradation and denitration reactor and a primary flue gas booster fan are arranged between the quenching tower and the activated carbon injector, and the three are connected in series.

[0009] A first auxiliary gas conveying pipe is arranged between the quench tower and the dioxin catalytic degradation and denitration reactor in parallel with the waste heat boiler;

[0010] A second auxiliary gas conveying pipe is arranged between the quench tower and the activated carbon injector in parallel with the waste heat boiler, the dioxin catalytic degradation and denitration reactor and the primary flue gas booster fan.

[0011] Preferably, in the primary flue gas stable boosting device of the electric furnace flue gas deep purification system, the primary flue gas booster fan is a variable frequency fan.

[0012] Preferably, in the primary flue gas stable boosting device of the electric furnace flue gas deep purification system, a quench tower front pressure transmitter and a booster fan front pressure transmitter are arranged in front of the quench tower and the primary booster fan respectively, and both are electrically connected with the primary flue gas booster fan.

[0013] Preferably, in the primary flue gas stable boosting device of the electric furnace flue gas deep purification system,

[0014] The primary flue gas is from the smelting furnace, passes through the combustion settling chamber, the quench tower, the waste heat boiler and the dioxin catalytic degradation and denitration reactor, and enters the primary flue gas booster fan, at this time the quench tower is in an unopened state;

[0015] Or in the waste heat boiler maintenance condition, the quench tower is interlocked and opened, the primary flue gas is from the smelting furnace, passes through the combustion settling chamber, the quench tower and the dioxin catalytic degradation and denitration reactor, and enters the primary flue gas booster fan;

[0016] Or in the primary flue gas booster fan maintenance condition, the primary flue gas is from the smelting furnace, passes through the combustion settling chamber and the quench tower, enters the bag-type dust collector, and is introduced to the chimney for emission by the dust removal fan.

[0017] The utility model has the following beneficial effects:

[0018] In order to realize the electric furnace flue gas deep purification coupling waste heat utilization, the primary flue gas process path is increased with the waste heat boiler and the dioxin catalytic degradation and denitration reactor;

[0019] In order to overcome the newly added resistance, the first auxiliary gas conveying pipe and the second auxiliary gas conveying pipe are arranged, three paths are arranged for the primary flue gas, and the stable operation of the secondary flue gas and the tertiary flue gas is basically not affected.

[0020] Other advantages, objects and features of the utility model will be embodied partly through the following description, and will be understood by those skilled in the art through the research and practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1An embodiment structure diagram of the primary flue gas stable pressure boosting device of the electric furnace flue gas deep purification system is provided. DETAILED DESCRIPTION

[0022] The utility model makes further detailed description in combination with the drawings, so that the person skilled in the art can implement according to the description text.

[0023] It should be understood that the terms such as "have", "contain" and "include" used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0024] As Figure 1 The utility model provides a kind of primary flue gas stable pressure boosting device of electric furnace flue gas deep purification system, including combustion sedimentation chamber 1 and quench tower 2, activated carbon injector 3, cloth bag dust collector 4, dust fan 5 and chimney 6 connected in sequence, further include:

[0025] Waste heat boiler 7, dioxin catalytic degradation synergic denitration reactor 8 and primary flue gas booster fan 9 are connected in series, which are arranged between the quench tower 2 and the activated carbon injector 3.

[0026] First auxiliary gas conveying pipe 10 is arranged between the quench tower 2 and the dioxin catalytic degradation synergic denitration reactor 8, which is connected in parallel with the waste heat boiler 7.

[0027] Second auxiliary gas conveying pipe 11 is arranged between the quench tower 2 and the activated carbon injector 3, which is connected in parallel with the waste heat boiler 7, the dioxin catalytic degradation synergic denitration reactor 8 and the primary flue gas booster fan 9.

[0028] The primary flue gas passes through waste heat boiler and dioxin catalytic degradation synergic denitration reactor, and the primary flue gas booster fan is additionally arranged, the pressure head is accurately controlled by the pressure difference between the front of the quench tower and the front of the booster fan, the newly added resistance is overcome, and the stable operation of the secondary flue gas and the tertiary flue gas is basically unaffected.

[0029] In an embodiment of the primary flue gas stable pressure boosting device of the electric furnace flue gas deep purification system provided by the utility model, the primary flue gas booster fan 9 is a variable frequency fan. The pressure head is accurately controlled by the pressure difference between the front of the quench tower and the front of the booster fan.

[0030] In an embodiment of the primary flue gas stable pressure boosting device of the electric furnace flue gas deep purification system provided by the utility model, a quench tower front pressure transmitter and a booster fan front pressure transmitter are arranged respectively before the quench tower 2 and the primary booster fan 9, and the two are electrically connected with the primary flue gas booster fan.

[0031] In an embodiment of the primary flue gas stable pressure increasing device of the electric furnace flue gas deep purification system, the primary flue gas is from the smelting furnace, passes through the combustion settling chamber, the quenching tower, the waste heat boiler and the dioxin catalytic degradation and denitration reactor, enters the primary flue gas booster fan, and the quenching tower is in an unopened state at this time.

[0032] The primary flue gas is from the smelting furnace, passes through the combustion settling chamber, the quenching tower, the waste heat boiler and the dioxin catalytic degradation and denitration reactor, enters the primary flue gas booster fan, and the quenching tower is in an unopened state at this time.

[0033] The primary flue gas is from the smelting furnace, passes through the combustion settling chamber, the quenching tower, the waste heat boiler and the dioxin catalytic degradation and denitration reactor, enters the primary flue gas booster fan, and the quenching tower is in an unopened state at this time.

[0034] The primary flue gas is from the smelting furnace, passes through the combustion settling chamber, the quenching tower, the waste heat boiler and the dioxin catalytic degradation and denitration reactor, enters the primary flue gas booster fan, and the quenching tower is in an unopened state at this time.

[0035] The primary flue gas is from the smelting furnace, passes through the combustion settling chamber, the quenching tower, the waste heat boiler and the dioxin catalytic degradation and denitration reactor, enters the primary flue gas booster fan, and the quenching tower is in an unopened state at this time.

[0036] The primary flue gas is from the smelting furnace, passes through the combustion settling chamber, the quenching tower, the waste heat boiler and the dioxin catalytic degradation and denitration reactor, enters the primary flue gas booster fan, and the quenching tower is in an unopened state at this time.

[0037] Although the embodiments of the utility model have been disclosed as above, it is not limited to the application listed in the specification and the embodiments, and it can be fully applied to various fields suitable for the utility model, and other modifications can be easily realized by those skilled in the art, so that the utility model is not limited to specific details and the drawings shown and described in the specification without departing from the general concept defined by the claims and equivalent scope.

Claims

1. The primary flue gas stable pressure boosting device of the deep purification system for the flue gas of the electric furnace, comprising the combustion settling chamber and the quench tower, the activated carbon injector, the bag-type dust collector, the dust removal fan and the chimney which are connected in sequence, characterized in that, Also include: A waste heat boiler, a dioxin catalytic degradation and denitration reactor, and a primary flue gas booster fan are arranged in series between the quench tower and the activated carbon injector; A first auxiliary gas conveying pipe is arranged between the quench tower and the dioxin catalytic degradation and denitration reactor in parallel with the waste heat boiler; A second auxiliary gas conveying pipe is arranged between the quench tower and the activated carbon injector in parallel with the waste heat boiler, the dioxin catalytic degradation and denitration reactor, and the primary flue gas booster fan.

2. The primary flue gas stable pressurization device of the deep purification system for the flue gas of an electric furnace according to claim 1, characterized in that, The primary flue gas booster fan is a variable frequency fan.

3. The primary flue gas stable pressurization device of the deep purification system for the flue gas of the electric furnace according to claim 2, characterized in that, A quench tower pre-tower pressure transmitter and a booster fan pre-pressure transmitter are arranged before the quench tower and the primary flue gas booster fan respectively, and are electrically connected to the primary flue gas booster fan.

4. The primary flue gas stable booster device of the electric furnace flue gas deep purification system according to claim 3, characterized in that, The primary flue gas from the smelting furnace passes through the combustion settling chamber, the quench tower, the waste heat boiler, and the dioxin catalytic degradation and denitration reactor, and enters the primary flue gas booster fan, at this time the quench tower is in an unopened state; Or in the waste heat boiler maintenance condition, the quench tower is opened by interlocking, the primary flue gas from the smelting furnace passes through the combustion settling chamber, the quench tower, and the dioxin catalytic degradation and denitration reactor, and enters the primary flue gas booster fan; Or in the primary flue gas booster fan maintenance condition, the primary flue gas from the smelting furnace passes through the combustion settling chamber and the quench tower, and then enters the bag filter, and is introduced to the chimney by the dust removal fan for emission.

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