CN217220873U - Negative pressure desulphurization unit in cement kiln - Google Patents

Abstract

The utility model provides a negative pressure desulfurization device in a cement kiln, which comprises a desulfurization spray gun arranged at each desulfurization position of the cement kiln, wherein the desulfurization device comprises a feeding mechanism, and one end of the feeding mechanism is connected with a desulfurizer bin; the other end of the feeding mechanism is connected with the tail of the desulfurization spray gun, and the desulfurizer is sucked into the desulfurization spray gun and sprayed out of the desulfurization spray gun to the ventilation pipeline under the negative pressure environment in the ventilation pipeline. The utility model discloses the sufficient place of negative pressure does not set up the pay-off fan in air pipe, directly makes through the negative pressure the desulfurizer inhales the gas material mixing chamber, gets into after and the gas mixture the desulfurization spray gun, in addition reation kettle's the function that assembles makes the desulfurizer with gaseous intensive mixing in the air pipe. The high-efficiency reaction in the reaction kettle is changed into pure flue gas.

Description

Negative pressure desulphurization unit in cement kiln

Technical Field

The utility model belongs to cement fires the field, concretely relates to negative pressure desulphurization unit in cement kiln.

Background

The cement kiln can generate sulfur-containing gas in the production process, and in order to eliminate pollution and protect the environment, the cement kiln needs to be subjected to desulfurization treatment. There are three main types of existing desulfurization techniques: firstly, wet flue gas desulfurization; secondly, dry desulfurization in the furnace; thirdly, the common dry flue gas desulfurization technology. The wet flue gas desulfurization is divided into: wet limestone desulfurization of flue gas; wet magnesia desulfurization of flue gas; ammoniation desulfurization, seawater desulfurization and the like. The dry desulfurization in the furnace is also called as in-furnace sulfur fixation, and the method comprises in-furnace calcium injection desulfurization, raw coal calcium preparation blending desulfurization, circulating fluidized bed combustion desulfurization and the like, and the common dry desulfurization techniques of flue gas comprise spray drying flue gas desulfurization, charged dry absorbent injection desulfurization, coal ash flue gas dry desulfurization and the like.

The existing cement kiln structure comprises a cyclone cylinder which is connected with C1-C5 in five stages, a desulfurization device is generally provided with one or more rows of spray guns at an air opening at the upper end of the C2 cyclone cylinder, powder or water agent for desulfurization is introduced into the spray guns, and the powder or water agent is atomized or directly sprayed out to be mixed with ascending air flow in the C2 cyclone cylinder to generate chemical reaction. With the current desulfurization requirements that are quite more and more stringent, there is a need for further improvements and improvements.

In addition, the existing desulfurization spray gun needs to be provided with a feeding mechanism and a feeding fan. And blowing the desulfurizer obtained in the feeding mechanism into the desulfurization spray gun by the feeding fan so that the desulfurizer can be mixed with gas containing sulfide. The whole feeding mechanism is relatively complex.

SUMMERY OF THE UTILITY MODEL

The utility model provides a negative pressure desulphurization unit in cement kiln.

The purpose of the utility model is realized with the following mode: a negative pressure desulfurization device in a cement kiln comprises desulfurization spray guns arranged at each desulfurization position of the cement kiln, and the desulfurization device comprises a feeding mechanism, wherein one end of the feeding mechanism is connected with a desulfurizer bin; the other end of the feeding mechanism is connected with the tail of the desulfurization spray gun, and the desulfurizer is sucked into the desulfurization spray gun and sprayed out of the desulfurization spray gun to the ventilation pipeline under the negative pressure environment in the ventilation pipeline.

The feeding mechanism comprises a buffer bin connected with a desulfurizer bin for storing desulfurizer through a valve, an annular gas-material mixing chamber is connected below the buffer bin through a valve, and the gas-material mixing chamber is connected with the tail parts of a plurality of circumferentially distributed desulfurization spray guns; and the desulfurizer is sucked into the desulfurization spray gun from the gas-material mixing chamber by the negative pressure environment in the ventilation pipeline and enters the ventilation pipeline from the desulfurization spray gun.

The desulfurizer discharging device is characterized in that a gate valve is arranged between the buffer bin and the desulfurizer bin, a rotary discharger with a metering device is arranged below the gate valve and above the buffer bin, and a valve arranged below the buffer bin is a star-shaped discharger.

And the desulfurization device is arranged in the cement kiln and is close to the air inlet of the high-temperature fan or the air outlet of the high-temperature fan, and the inside of the ventilation pipeline is provided with a desulfurization device.

The ventilating duct at the position below the desulfurization spray gun is connected with a reaction kettle, and the reaction kettle becomes a part of the ventilating duct of the cement kiln; the reaction kettle comprises an outer pipeline, one end of the outer pipeline is an inlet end of the reaction kettle, and the other end of the outer pipeline is an outlet end; at least two layers of reaction rings with closed cross section shapes are arranged in the outer pipeline, the reaction rings are sleeved together according to the sequence of the inner cavities from small to large, and the reaction rings on each layer and the reaction rings and the inner wall of the outer pipeline are connected through supporting pieces; from the inlet end to the outlet end of the reaction kettle, the space between the inner wall of the outer pipeline and the outer wall of each layer of the reaction ring is gradually enlarged.

The outer pipeline is a cylindrical pipeline, and the reaction ring is a conical hollow structure; the reaction rings are arranged coaxially with the outer pipe.

The reaction ring is made of silicon carbide.

The desulfurization spray guns are circumferentially distributed above the wind direction of the inlet end of the reaction kettle, wherein each area of the outer pipeline divided by the reaction ring corresponds to at least one desulfurization spray gun.

The utility model has the advantages that: the place that the negative pressure is sufficient in the air pipe, for example high temperature fan exit does not set up the pay-off fan, directly makes through the negative pressure the desulfurizer inhales gas material mixing chamber, and gets into after mixing with the gas the desulfurization spray gun, in addition reation kettle's the function of assembling makes the desulfurizer with gas intensive mixing in the air pipe. The high-efficiency reaction in the reaction kettle is changed into pure flue gas.

Drawings

FIG. 1 is a perspective view of a reaction vessel.

FIG. 2 is a perspective view of the other side of the reaction vessel.

FIG. 3 shows a first embodiment of a desulfurization unit (provided with a feed fan).

Fig. 4 is a schematic view of the feed mechanism and fan of fig. 3.

FIG. 5 shows a second embodiment of the desulfurization apparatus (without a feeder fan).

FIG. 6 is a schematic view of the installation of the reaction vessel and the desulfurization lances within the vent conduit.

Fig. 7 is another side schematic view of fig. 6.

Wherein, 1 is a high temperature fan, 2 is a reaction kettle, 20 is an outer pipeline, 21 is a reaction ring, 22 is a support piece, 23 is an inlet end, 24 is an outlet end, 3 is a desulfurization spray gun, 4 is a ventilating pipeline, 5 is a mixing air pipe, 6 is a feeding fan, 7 is a feeding mechanism, 70 a buffer bin, 71 is a gas-material mixing chamber, 72 is a desulfurizer bin, 73 is a gate valve, 74 is a rotary feeder, and 75 is a star-shaped discharger.

Detailed Description

In the present invention, unless otherwise specifically defined and limited, the technical terms used in the present application should be the meanings commonly understood by those skilled in the art to which the present invention belongs. The terms "connected", "fixed", "arranged" and the like are to be understood in a broad sense, and may be fixedly connected, detachably connected or integrated; can be directly connected or indirectly connected through an intermediate medium; either mechanically or electrically. Unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features, or indirectly contacting the first and second features through intervening media. Also, a first feature "on" or "over" or "above" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature "under" or "beneath" a second feature may be directly under or obliquely under the first feature or may simply mean that the first feature is at a lesser level than the second feature. Relational terms such as first, second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Terms used in the description such as "center", "lateral", "longitudinal", "length", "width", "thickness", "height", "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated.

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings and specific embodiments. As shown in FIG. 5, the desulfurizing agent is transported under negative pressure. The desulfurization device comprises a feeding mechanism 7, and one end of the feeding mechanism 7 is connected with a desulfurizer bin 72; the other end of the feeding mechanism 7 is connected with the tail part of the desulfurization spray gun 3, and the negative pressure environment in the ventilation pipeline 4 sucks the desulfurizing agent into the desulfurization spray gun 3 and sprays the desulfurizing agent out of the desulfurization spray gun 3 to the ventilation pipeline 4.

The feeding mechanism 7 comprises a buffer bin 70 connected with a desulfurizer bin 72 for storing desulfurizer through a valve, an annular gas-material mixing chamber 71 is connected below the buffer bin 70 through a valve, and the gas-material mixing chamber 71 is connected with the tail parts of a plurality of circumferentially distributed desulfurization spray guns 3; the negative pressure environment in the ventilation duct 4 sucks the desulfurizing agent from the gas-material mixing chamber 71 into the desulfurizing spray gun 3, and the desulfurizing agent enters the ventilation duct 4 from the desulfurizing spray gun 3. Negative pressure exists in the ventilation pipeline 4, and the negative pressure in some areas, such as the outlet of the high-temperature fan 1, is more than 7000Mpa, so that the desulfurizer can be sucked into the gas-material mixing chamber 71 without arranging a fan, is mixed with gas and then enters the desulfurization spray gun 3, and the gathering function of the reaction kettle 2 is added, so that the desulfurizer and the gas in the ventilation pipeline 4 are fully mixed. After the high-efficiency reaction in the reaction kettle 2, the flue gas becomes pure flue gas. The desulfurizer is water agent or powder, preferably desulfurized powder.

A gate valve 73 is arranged between the buffer bin 70 and the desulfurizer bin 72, a rotary blanking device 74 with a metering device is arranged below the gate valve 73 and above the buffer bin 70, and a valve arranged below the buffer bin 70 is a star-shaped discharger 75.

Furthermore, the desulphurization device is arranged in the ventilation pipeline 4 which is close to the air inlet of the high-temperature fan 1 or the air outlet of the high-temperature fan 1 in the cement kiln. The negative pressure in the ventilation duct 4 near the high temperature fan 1, for example within twenty meters, is about 7000Mpa, and the negative pressure is high, so that the desulfurizing agent can be conveniently sucked. And the desulfurization effect at the high-temperature fan 1 is better.

As shown in fig. 1 to 7, the ventilating duct 4 of the desulfurization lance 3 located at the air downward position is connected to the reaction vessel 2, and the reaction vessel 2 is a part of the ventilating duct 4 of the cement kiln. As shown in fig. 1-2, the in-pipeline gas flow reaction kettle comprises an outer pipeline 3, wherein one end of the outer pipeline 3 is an inlet end 23 of the reaction kettle 2, and the other end of the outer pipeline 3 is an outlet end 24; at least two layers of reaction rings 21 with closed annular cross sections are arranged in the outer pipeline 3, the reaction rings 21 are sleeved together from small to large in sequence, and the reaction rings 21 on each layer and the reaction rings 21 and the inner wall of the outer pipeline 3 are connected through supporting pieces 22; from the inlet end 23 to the outlet end 24 of the reaction vessel 2, the space between the inner wall of the outer pipe 3 and the outer wall of each layer of the reaction ring 21 becomes gradually larger. Wherein, the support member 22 may be a rod member, one end of which is welded to the inner wall of the outer pipe 3, and each reaction ring 21 is welded to the support member 22. A plurality of supporting members 22 may be disposed and uniformly distributed in the reaction vessel 2 in a ring shape. The inlet end 23 of the reactor ring 21 has a larger cross-section than the outlet end 24 of the annular plate, so that the gas flow gradually converges toward the middle of the reactor 2 from the inlet end 23 to the outlet end 24 of the reactor 2. The gas flows are easier to mix in the middle area of the outlet end 24 of the reaction vessel 2, the gas is supplemented from other places at the edge position of the outlet end 24, and a vortex is formed at the outlet end 24 of the whole reaction vessel 2, so that the gas flows are more fully mixed.

Further, the outer pipeline 3 is a cylindrical pipeline, and the reaction ring 21 is a conical hollow structure; the reaction rings 21 are all arranged coaxially with the outer pipe 3. Of course, the outer pipe 3 may also be of other irregular shapes, or the reaction ring 21 may be of other tapered thin-walled structures, such as a polygonal pyramid, such as a wave-shaped ring in cross-section, or other irregular shapes. As long as the effect of the convergence and swirl of the air flow can be achieved.

As shown in fig. 3 to 7, a desulfurization apparatus using the in-duct air flow reaction vessel 2 includes desulfurization lances 3 provided at respective desulfurization positions of a cement kiln, an inlet end 23 of the reaction vessel 2 is connected to a cement kiln ventilation duct 4 at a position downstream of the desulfurization lances 3, and the reaction vessel 2 is a part of the cement kiln ventilation duct 4. Here, the position of the desulfurization lance 3 facing downward is not physically a position below the desulfurization lance 3, but a position of the desulfurization lance 3 near the cement kiln duct facing downward in the flow direction of the air flow in the cement kiln. If the gas flows upward, the reaction vessel 2 is located above the desulfurization lances 3. The air speed in the ventilating duct 4 of the cement kiln can reach 30m/s, and the desulfurizer directly passes through the desulfurization spray gun 3 and is thrown into the ventilating duct 4 and adheres to the wall, and can not be fully mixed with the flue gas when the desulfurizer cannot reach the central position. In the invention, the reaction kettle 2 is arranged at the position below the air of the desulfurization spray gun 3, the reaction kettle 2 comprises a plurality of layers of reaction rings 21 arranged from inside to outside, and the desulfurizing agent can be dispersed into different reaction rings 21 and can be mixed with more air flows. In addition, the conical structure of the reaction ring 21 can play a role in converging the desulfurizing agent and forming a vortex, so that the mixing of the desulfurizing agent and the airflow is further increased, and the reaction efficiency is increased.

The desulfurization lances 3 are circumferentially distributed above the wind direction at the inlet end 23 of the reaction vessel 2, wherein each region of the outer duct 3 divided by the reaction ring 21 corresponds to at least one of the desulfurization lances 3. The desulfurizer can enter each area, and the uniform mixing degree between the desulfurizer and the air flow is further increased.

As shown in fig. 3-4, a way of conveying the desulfurizing agent under positive pressure. The desulfurization device comprises a mixed air pipe 5 connected with the desulfurization spray gun 3, a feeding fan 6 respectively connected with the mixed air pipe 5 and a feeding mechanism 7; the feeding fan 6 is arranged behind the feeding mechanism 7, and the feeding mechanism 7 is connected with the desulfurizer bin 72 and is provided with a metering mechanism and a valve. The feeding fan 6 feeds air with pressure, the air in the mixed air pipe 5 is mixed with the desulfurizer entering the mixed air pipe 5, then the mixed air enters the desulfurization spray gun 3 through a mixing component, and the mixed air is sprayed out of the desulfurization spray gun 3 and enters the ventilation pipeline 4 of the cement kiln. The feeding mechanism 7 comprises a buffer bin 70 connected with the desulfurizer bin 72 through a gate valve 73 and an air lock valve with a metering device, and the lower end of the buffer bin 70 is communicated with the mixing air pipe 5 through a valve and a pipeline. The structure of blowing desulfurization powder into the desulfurization spray gun 3 by the feed fan 6 is known in the art and will not be described in detail.

As shown in fig. 6 to 7, the reaction ring 21 is made of silicon carbide. The reaction ring 21 has a catalytic action, so that the desulfurization reaction can be accelerated, and the desulfurization efficiency can be improved.

In addition, the cement kiln comprises a primary cyclone, a secondary cyclone, a tertiary cyclone, a four-stage cyclone and a five-stage cyclone which are arranged from top to bottom in sequence; the top end of the primary cyclone cylinder is connected with an air inlet of a high-temperature fan 1 through a pipeline, an air outlet of the high-temperature fan 1 is communicated with a dust remover through a pipeline, and the dust remover is communicated with a chimney through a pipeline; the desulfurization spray gun 3 and the reaction kettle 2 are arranged in the ventilation pipeline 4 at least one position, namely the position close to the air inlet of the high-temperature fan 1, the position close to the air outlet of the high-temperature fan 1, the position of the flue gas outlet pipeline of the secondary cyclone cylinder and the position of the flue gas outlet pipeline of the tertiary cyclone cylinder.

In the specific implementation: the sulfur-containing gas sequentially passes through a rotary kiln, a decomposing furnace, a five-stage cyclone, a four-stage cyclone, a three-stage cyclone, a two-stage cyclone and a one-stage cyclone of the cement kiln; high temperature fan 1, dust remover. The desulfurization treatment is carried out in the ventilation duct 4 with the desulfurization spray gun 3, and finally the desulfurization solution flows out through a chimney.

In the desulfurization process, under the condition that the negative pressure of the ventilation pipeline 4 is enough, a fan is not arranged, and the desulfurizing agent and air are mixed through the negative pressure, sucked into the desulfurization spray gun 3 and sprayed into the ventilation pipeline 4.

Under the condition of insufficient negative pressure, a feeding fan 6 is arranged, the desulfurizing agent and air are mixed and blown into the desulfurizing spray gun 3 and sprayed into the corresponding ventilating duct 4 by blowing air through the feeding fan 6,

After entering the ventilation duct 4, the desulfurizing agent enters the reaction kettle 2, and the desulfurizing agent is dispersed in different reaction rings 21 and mixed with more sulfide-containing airflow. The conical structure of the reaction ring 21 can play a role in converging the desulfurizer and forming a vortex, so that the mixing of the desulfurizer and the airflow is further increased, and the reaction efficiency is increased.

The features of the embodiments described above may be arbitrarily combined, and the combination of the features is not contradictory, and should be considered as a range described in the present specification. Without departing from the overall concept of the present invention, the technical solution of the present invention and equivalent replacements or changes, and a plurality of changes and improvements made, should also be regarded as the protection scope of the present invention.

Claims (8)

1. The utility model provides a negative pressure desulphurization unit in cement kiln, desulphurization unit is including setting up the desulfurization spray gun at each desulfurization position of cement kiln, its characterized in that: the desulfurizing device comprises a feeding mechanism, and one end of the feeding mechanism is connected with the desulfurizing agent bin; the other end of the feeding mechanism is connected with the tail of the desulfurization spray gun, and the negative pressure environment in the ventilation pipeline sucks the desulfurizing agent into the desulfurization spray gun and sprays the desulfurizing agent out of the desulfurization spray gun to the ventilation pipeline.

2. The negative pressure desulfurization device in a cement kiln as claimed in claim 1, characterized in that: the feeding mechanism comprises a buffer bin connected with a desulfurizer bin for storing desulfurizer through a valve, an annular gas-material mixing chamber is connected below the buffer bin through a valve, and the gas-material mixing chamber is connected with the tail parts of a plurality of circumferentially distributed desulfurization spray guns; and the desulfurizer is sucked into the desulfurization spray gun from the gas-material mixing chamber by the negative pressure environment in the ventilation pipeline and enters the ventilation pipeline from the desulfurization spray gun.

3. The negative pressure desulfurization device in the cement kiln as claimed in claim 2, characterized in that: the desulfurizer discharging device is characterized in that a gate valve is arranged between the buffer bin and the desulfurizer bin, a rotary discharger with a metering device is arranged below the gate valve and above the buffer bin, and a valve arranged below the buffer bin is a star-shaped discharger.

4. The negative pressure desulfurization device in a cement kiln as claimed in claim 2, characterized in that: and the desulfurization device is arranged in the ventilation pipeline close to the air inlet or the air outlet of the high-temperature fan in the cement kiln.

5. The negative pressure desulfurization device in the cement kiln as recited in claim 4, characterized in that: the ventilating duct at the position below the desulfurization spray gun is connected with a reaction kettle, and the reaction kettle becomes a part of the ventilating duct of the cement kiln; the reaction kettle comprises an outer pipeline, one end of the outer pipeline is an inlet end of the reaction kettle, and the other end of the outer pipeline is an outlet end; at least two layers of reaction rings with closed cross section shapes are arranged in the outer pipeline, the reaction rings are sleeved together according to the sequence of the inner cavities from small to large, and the reaction rings on each layer and the reaction rings and the inner wall of the outer pipeline are connected through supporting pieces; from the inlet end to the outlet end of the reaction kettle, the space between the inner wall of the outer pipeline and the outer wall of each layer of the reaction ring is gradually enlarged.

6. The negative pressure desulfurization device in the cement kiln as recited in claim 5, characterized in that: the outer pipeline is a cylindrical pipeline, and the reaction ring is in a conical hollow structure; the reaction rings are arranged coaxially with the outer pipe.

7. The negative pressure desulfurization device in a cement kiln as claimed in claim 5, characterized in that: the reaction ring is made of silicon carbide.

8. The negative pressure desulfurization device in a cement kiln as claimed in claim 5, characterized in that: the desulfurization spray guns are circumferentially distributed above the wind direction of the inlet end of the reaction kettle, wherein each area of the outer pipeline divided by the reaction ring corresponds to at least one desulfurization spray gun.

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