CN210772262U - Flue gas treatment device and flue gas treatment system - Google Patents

Abstract

The utility model provides a flue gas treatment device and flue gas treatment system, the flue gas treatment device includes flue gas inlet pipe, flue gas outlet pipe, heat transfer device, air inlet pipe, air outlet pipe, flue gas inlet pipe and heat transfer device's flue gas channel import intercommunication, flue gas outlet pipe and heat transfer device's flue gas channel export intercommunication, the entrance point of air outlet pipe and heat transfer device's air channel export intercommunication, the exit end and the flue gas outlet pipe of air outlet pipe intercommunication for air and flue gas after the heat transfer mix in the air outlet pipe, and in the flue gas channel, the flow direction of flue gas is vertical upwards; a flue gas processing apparatus and flue gas processing system, through setting up flue gas processing apparatus for industrial production is at the in-process of discharging the flue gas, the condition that the chimney emits white cigarette can not appear.

Description

Flue gas treatment device and flue gas treatment system

Technical Field

The utility model relates to an environmental protection technology field, in particular to flue gas processing apparatus and flue gas processing system.

Background

The problem of ultra-low emission of exhaust fumes from power plant boilers, petrochemical heating furnaces and the like has attracted general attention from heat society and strong national attention. Especially in developed areas such as the Long triangle, the bead triangle and the Jingjin in the south of east coast, in order to meet the requirement of ultra-low emission standard, the wet desulphurization accounts for 93% of the flue gas desulphurization device in the current production, the water vapor in the flue gas after the wet desulphurization is in a nearly saturated state, if the water vapor is directly discharged through a conventional chimney, the water vapor in the flue gas can be rapidly converted into a supersaturated state after entering the atmospheric environment for cooling, and the water vapor is condensed to form liquid drops, namely the phenomenon that the chimney emits white smoke is formed; meanwhile, the liquid drops formed by condensation can fall to the ground to form acid rain or gypsum rain, so that the surrounding environment is easily polluted, and potential safety hazards are caused. Therefore, the problem of white smoke emission from the chimney is one of the technical problems to be solved urgently by the technical personnel in the field.

The applicant submits a patent application with the application number of CN201610335353.6 while studying the problem of white smoke emission of a chimney in the early stage, and discloses energy-saving and environment-friendly equipment and a process for reducing the white smoke emission of the smoke. However, as the applicant further studies, it has been found that the application cannot improve the structure of the chimney itself, and thus the white smoke emission of the chimney can be reduced to some extent, but it is difficult to control the smoke emission in the chimney, and the problem of the white smoke emission of the chimney cannot be completely solved.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a smoke treatment device and a smoke treatment system to solve the problem of white smoke emission from the chimney existing in the smoke emission process in the prior art.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

the utility model provides a flue gas processing device, includes flue gas inlet pipe, flue gas outlet pipe, heat transfer device, air inlet pipe, air outlet pipe, flue gas inlet pipe and heat transfer device's flue gas channel import intercommunication, flue gas outlet pipe and heat transfer device's flue gas channel export intercommunication, air outlet pipe's entrance point and heat transfer device's air channel export intercommunication, air outlet pipe's exit end and flue gas outlet pipe intercommunication for air after the heat transfer mixes in air outlet pipe with the flue gas, and in flue gas channel, the flow direction of flue gas is vertical upwards.

Furthermore, a speed reducing pipe is arranged between the flue gas outlet pipe and the heat exchange device, the inlet end of the speed reducing pipe is communicated with the flue gas channel of the heat exchange device, and the outlet end of the speed reducing pipe is communicated with the flue gas outlet pipe.

Furthermore, the flue gas treatment device comprises a demisting device, the demisting device is arranged between the speed reduction pipe and the flue gas outlet pipe, the inlet end of the demisting device is connected with the outlet end of the speed reduction pipe, and the outlet end of the demisting device is connected with the flue gas outlet pipe.

Furthermore, the inlet end of the flue gas outlet pipe is communicated with the outlet of the flue gas channel of the heat exchange device, and the outlet end of the flue gas outlet pipe is communicated with a chimney or the external atmosphere.

Further, a mixing space is arranged in the flue gas outlet pipe.

Furthermore, the outlet end of the air outlet pipe is connected with the side wall of the flue gas outlet pipe, and the air outlet pipe penetrates through the side wall of the flue gas outlet pipe and is communicated with the mixing space in the flue gas outlet pipe.

Further, the outlet of the air outlet pipe is tangential to the flue gas outlet pipe.

Further, the air outlet pipe comprises an outlet section, a guide section and a tangential inflow section which are sequentially connected, the outlet section is communicated with an air channel outlet of the heat exchange device, the tangential inflow section is tangent and connected with the flue gas outlet pipe, and the guide section is respectively in smooth transition connection with the outlet section and the tangential inflow section.

Further, the flue gas treatment device comprises a plurality of heat exchange devices, an air outlet pipe is formed among the heat exchange devices, an opening is formed in the side wall, facing the air outlet pipe, of any one of the heat exchange devices, and the opening is communicated with an air channel of the heat exchange device.

A flue gas treatment system comprises the flue gas treatment device.

Compared with the prior art, a flue gas processing apparatus and flue gas processing system have following advantage:

the flue gas treatment device and the flue gas treatment system can introduce the flue gas which needs to be discharged by a factory from the flue gas inlet pipe and enter the flue gas channel of the heat exchange device by arranging the flue gas treatment device, and utilize the normal temperature air to carry out heat exchange on the flue gas; after heat exchange, high-temperature flue gas is changed into low-temperature flue gas after heat is supplied to the high-temperature flue gas, meanwhile, part of steam in the flue gas can be condensed into condensed water drops along with the reduction of the temperature of the flue gas, the flue gas flows vertically upwards in a vertically arranged flue gas channel, the condensed water drops flow downwards under the action of self gravity, and therefore part of steam in the flue gas is separated, and the absolute humidity of the flue gas is reduced; the normal temperature air absorbs heat to become hot dry air, then enters the flue gas outlet pipe through the air outlet pipe, and is mixed with the low temperature flue gas to form mixed flue gas; at the moment, the temperature of the mixed flue gas in the flue gas outlet pipe is higher than that of the low-temperature flue gas, the absolute humidity of the mixed flue gas is lower than that of the low-temperature flue gas, the relative humidity of the mixed flue gas is also lower than that of the low-temperature flue gas along with the rise of the temperature of the flue gas, and finally the mixed flue gas is discharged outwards through the flue gas outlet pipe or a chimney communicated with the flue gas outlet pipe;

after the mixed flue gas is discharged into the atmosphere, the temperature of the mixed flue gas is sharply reduced; but because the relative humidity of this moment mixed flue gas is lower, at the in-process of mixing the flue gas cooling, the vapor in the mixed flue gas is in unsaturated state all the time, and vapor keeps the gaseous state all the time promptly, can not condense to the droplet, thereby through the utility model discloses set up in the flue gas treatment process flue gas processing apparatus for industrial production can not appear the condition that the chimney emits white smoke at the in-process of discharging the flue gas.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic structural diagram of a flue gas treatment device according to an embodiment of the present invention;

fig. 2 is a partial enlarged view of the embodiment of the present invention at a in fig. 1;

fig. 3 is a schematic view of a flue gas treatment device according to an embodiment of the present invention;

fig. 4 is a top view of a flue gas treatment device at a flue gas outlet pipe according to an embodiment of the present invention;

fig. 5 is another schematic structural diagram of a flue gas treatment device according to an embodiment of the present invention;

fig. 6 is a top view of a flue gas treatment device at a flue gas outlet pipe according to an embodiment of the present invention;

fig. 7 is another top view of a flue gas treatment device at a flue gas outlet pipe according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a heat exchange device in a flue gas treatment device according to an embodiment of the present invention.

Description of reference numerals:

the device comprises a flue gas inlet pipe 1, a flue gas outlet pipe 2, a mixing space 21, a guide plate 22, a heat exchange device 3, an air inlet pipe 31, an air outlet pipe 32, an outlet section 321, a guide section 322, a tangential inflow section 323, an air channel 33, a flue gas channel 34, an opening 35, a fan 4, a speed reduction pipe 5, a demisting device 6, a mixing pipe section 7, a flow mixer 8 and a sealing structure 9.

Detailed Description

The inventive concepts of the present disclosure will be described hereinafter using terms commonly employed by those skilled in the art to convey the substance of their work to others skilled in the art. These utility concepts may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Example 1

In order to solve the problem that white smoke is easy to be emitted from a chimney in the process of discharging the smoke after the smoke is treated by the existing smoke treatment system, as shown in fig. 1-2, the present embodiment proposes a flue gas treatment device, which comprises a flue gas inlet pipe 1, a flue gas outlet pipe 2, a heat exchange device 3, the flue gas inlet pipe 1 is communicated with the inlet of a flue gas channel 34 of the heat exchange device 3, the flue gas outlet pipe 2 is communicated with the outlet of the flue gas channel 34 of the heat exchange device 3, the heat exchange device 3 is provided with an air inlet pipe 31 and an air outlet pipe 32, the inlet end of the air outlet pipe 32 is communicated with the outlet of an air channel 33 of the heat exchange device 3, the outlet end of the air outlet pipe 32 is communicated with the flue gas outlet pipe 2, so that the heat-exchanged air and the flue gas are mixed in the air outlet pipe 32, and the flue gas channel 34 extends in the vertical direction.

Wherein, in the flue gas channel 34, the flow direction of the flue gas is vertically upward; preferably, in the overall flow direction of the flue gas and the air, the flow direction of the flue gas is vertically upward in the flue gas channel 34, and the overall flow direction of the air is vertically upward in the air channel 33, that is, the heat transfer between the flue gas and the air is cocurrent.

It should be noted that, the air flow direction here is vertically upward, which refers to the overall flow direction of the air; baffles may also be provided in the air passages 33 to allow the air to flow in a fold-line fashion, but still maintain the overall air flow direction vertically upward.

For industrial application, the flue gas treatment device provided by the embodiment can be directly applied to the existing flue gas treatment system, the original flue gas treatment system is not required to be changed, and the flue gas treatment device can be used only by adjusting part of the pipeline structure; specifically, the flue gas inlet pipe 1 is communicated with a flue gas pipeline of an existing flue gas treatment system, for example: directly communicating a flue gas inlet pipe 1 with a flue gas outlet of a desulfurizing tower, or directly communicating the flue gas inlet pipe 1 with a flue gas outlet of a boiler, and the like; and then the flue gas outlet pipe 2 is communicated with a chimney, or the flue gas outlet pipe 2 with enough length is directly used as the chimney to realize the outward discharge of the flue gas.

Therefore, by arranging the flue gas treatment device, flue gas to be discharged by a factory can be introduced from the flue gas inlet pipe 1 and enters the flue gas channel 34 of the heat exchange device 3, and the flue gas is subjected to heat exchange by utilizing normal-temperature air; after heat exchange, the high-temperature flue gas is changed into low-temperature flue gas after supplying heat, meanwhile, part of steam in the flue gas can be condensed into condensed water drops along with the reduction of the temperature of the flue gas, the flue gas flows vertically upwards in the vertically arranged flue gas channel 34, the condensed water drops flow downwards under the action of self gravity, and therefore part of steam in the flue gas is separated, and the absolute humidity of the flue gas is reduced; the normal temperature air absorbs heat to become hot dry air, then enters the flue gas outlet pipe 2 through the air outlet pipe 32, and is mixed with the low temperature flue gas to form mixed flue gas; at this time, in the flue gas outlet pipe 2, the temperature of the mixed flue gas is higher than that of the low-temperature flue gas, the absolute humidity of the mixed flue gas is lower than that of the low-temperature flue gas, and along with the rise of the temperature of the flue gas, the relative humidity of the mixed flue gas is also lower than that of the low-temperature flue gas, and finally the mixed flue gas is discharged outside through the flue gas outlet pipe 2 or a chimney communicated with the flue gas outlet pipe 2.

Specifically, after the mixed flue gas is discharged into the atmosphere, the temperature of the mixed flue gas is sharply reduced; but because the relative humidity of the mixed flue gas is lower at this moment, at the in-process of mixed flue gas cooling, the vapor in the mixed flue gas is in unsaturated state all the time, and vapor keeps the gaseous state all the time promptly, can not condense into the droplet, thereby set up flue gas processing apparatus in flue gas treatment process through this embodiment for industrial production can not appear the condition that the chimney emits white smoke at the in-process of discharging the flue gas.

Preferably, a mixing space 21 is arranged in the flue gas outlet pipe 2, so as to provide a space for the mixing process of low-temperature flue gas and hot dry air formed after heat exchange; the length of the flue gas outlet pipe 2 is more than 5 meters, so that the flue gas outlet pipe 2 can have a large enough mixing space 21, low-temperature flue gas and hot dry air can be fully mixed, more uniform mixed flue gas is formed, and white smoke emission of a chimney is avoided.

In addition, in order to ensure that the air has enough flow and flow rate to ensure the heat exchange effect, the inlet end of the air inlet pipe 31 is communicated with the fan 4, and the fan 4 is used for providing power to send external air into the smoke treatment device.

Example 2

Considering that the flue gas in the flue gas channel 34 tends to have a high flow velocity, after heat exchange, a part of condensed water drops still carried out with the flue gas still moves upwards and enters the flue gas outlet pipe 2, and the part of condensed water drops affects the humidity condition of the mixed flue gas, which is not beneficial to ensuring the condition of stopping white smoke from the chimney.

Therefore, in order to solve this problem, as shown in fig. 1 to 3, this embodiment further improves the flue gas treatment device on the basis of embodiment 1, specifically:

a speed reducing pipe 5 is arranged between the flue gas outlet pipe 2 and the heat exchange device 3, the inlet end of the speed reducing pipe 5 is communicated with the flue gas channel 34 of the heat exchange device 3, and the outlet end of the speed reducing pipe 5 is communicated with the flue gas outlet pipe 2; wherein, the sectional area of deceleration pipe 5 is greater than the sectional area sum of all flue gas passageway 34 in heat transfer device 3, thereby to the flue gas, the inside of deceleration pipe 5 forms a deceleration space, after the heat transfer, the flue gas flows out from flue gas passageway 34, get into in deceleration pipe 5, along with the increase of flowing sectional area, the velocity of flow of flue gas can sharply reduce, thereby the condensation water droplet that the flue gas carried out can separate with the flue gas under the effect of self gravity, thereby avoided the condensation water droplet to get into in flue gas outlet pipe 2 along with the flue gas, in order to ensure the humidity situation of mixing the flue gas, avoid appearing the condition that the chimney emits the white cigarette and take place.

Simultaneously, because the flue gas in the deceleration pipe 5 is for after the heat transfer, and not with the flue gas of air mixing to through the setting of deceleration pipe 5, in actual flue gas treatment process, can gather the flue gas after the heat transfer through deceleration pipe 5, acquire the state of relevant flue gas, be convenient for on the one hand carry out the analysis to heat exchange efficiency of heat transfer device 3, on the other hand is convenient for carry out the analysis to the white cigarette effect of disappearing after flue gas and air mixing and compares.

Preferably, as shown in fig. 3, the deceleration pipe 5 is a flared pipe, the inlet end of the deceleration pipe 5 is a necking end of the flared pipe, and the outlet end of the deceleration pipe 5 is a flaring end of the flared pipe, so that the flow speed of the flue gas in the deceleration pipe 5 is constantly reduced, condensed water droplets carried by the flue gas are separated from the flue gas under the action of self gravity, the flue gas is ensured to have lower humidity, and the occurrence of white smoke in a chimney is avoided.

In addition, in order to further stop the condensation water droplet along with the flue gas gets into flue gas outlet pipe 2, flue gas processing apparatus includes defogging device 6, defogging device 6 sets up between speed reduction pipe 5 and flue gas outlet pipe 2, defogging device 6's entrance point is connected with speed reduction pipe 5's exit end, defogging device 6's exit end is connected with flue gas outlet pipe 2 to behind speed reduction pipe 5 fully reduced the flue gas velocity of flow, set up defogging device 6 again, be favorable to fully getting rid of the condensation water droplet that carries in the flue gas, stopped the condensation water droplet and taken place along with the condition that the flue gas got into in flue gas outlet pipe 2, further ensured the humidity situation of mixing the flue gas in flue gas outlet pipe 2, avoid appearing the condition that the chimney emits the white cigarette and take place.

The defogging device 6 is a conventional defogger in the prior art, and the specific structure and the working principle thereof are both in the prior art and are not described herein again.

Example 3

In the flue gas outlet pipe 2, in order to ensure that the low-temperature flue gas and the hot dry air are fully mixed, as shown in fig. 1 to 4, the present embodiment further improves the flue gas treatment device on the basis of embodiment 1 or embodiment 2, specifically:

the inlet end of the flue gas outlet pipe 2 is communicated with the outlet of the flue gas channel 34 of the heat exchange device 3, and the outlet end of the flue gas outlet pipe 2 is communicated with a chimney or the external atmosphere, so that the flue gas can be discharged sequentially through the inlet end of the flue gas outlet pipe 2 and the outlet end of the flue gas outlet pipe 2 after heat exchange.

Meanwhile, a mixing space 21 is arranged in the flue gas outlet pipe 2, so that a space is provided for the mixing process of low-temperature flue gas and hot dry air formed after heat exchange.

The air outlet pipe 32 is communicated with the flue gas outlet pipe 2, specifically, the outlet end of the air outlet pipe 32 is connected with the side wall of the flue gas outlet pipe 2, and the air outlet pipe 32 penetrates through the side wall of the flue gas outlet pipe 2 and is communicated with the mixing space 21 in the flue gas outlet pipe 2; so that the hot dry air formed after heat exchange can enter the mixing space 21 through the air outlet pipe 32 and be mixed with the low-temperature flue gas to form mixed flue gas.

Considering that the flowing directions of the flue gas and the air in the mixing space 21 are both vertical and upward, the problem of insufficient mixing is easy to occur; in order to solve the problem, the outlet of the air outlet pipe 32 is tangent to the flue gas outlet pipe 2, that is, in the flue gas outlet pipe 2, the inflow direction of the hot dry air is tangent to the flue gas outlet pipe 2, so that the hot dry air flows into the mixing space 21 along the tangential direction of the flue gas outlet pipe 2, and the hot dry air can form a spiral airflow in the mixing space 21, which is beneficial to increasing the turbulence condition of the hot dry air and the low-temperature flue gas, ensuring that the flue gas and the hot dry air can be further and fully mixed in the mixing space 21, avoiding the situation that the flue gas and the hot dry air are not fully mixed, directly ascending to a smoke outlet and discharging to the atmosphere, and further avoiding the occurrence of the situation that a chimney emits white smoke.

The air outlet pipe 32 comprises an outlet section 321, a guiding section 322 and a tangential inflow section 323 which are connected in sequence, wherein the outlet section 321 is communicated with the outlet of the air channel 33 of the heat exchange device 3, the tangential inflow section 323 is tangent and connected with the flue gas outlet pipe 2, and the guiding section 322 is smoothly and transitionally connected with the outlet section 321 and the tangential inflow section 323 respectively.

The outlet section 321, the guide section 322 and the tangential inflow section 323 are integrally formed, so that the air outlet pipe 32 is convenient to process and manufacture, the mechanical strength of the air outlet pipe 32 is ensured, a smooth flow channel is provided for the flow of the hot dry air, the flow resistance is reduced, the hot dry air is ensured to have sufficient flow velocity, and the mixing efficiency of the low-temperature smoke and the hot dry air is improved.

Example 4

As shown in fig. 1 to 3, this embodiment will explain the arrangement of the air inlet pipe 31 and the air outlet pipe 32 based on any of the embodiments 1 to 3.

At least one air inlet pipe 31 is arranged on the flue gas treatment device, preferably, the air inlet pipes 31 are multiple and arranged in an array mode along the side wall of the heat exchange device 3, so that enough air quantity and air flow rate are provided for the heat exchange device 3, and the heat exchange effect is ensured.

The flue gas treatment device is provided with at least one air outlet pipe 32, preferably, the air outlet pipes 32 are arranged in an array mode along the side wall of the flue gas outlet pipe 2, so that hot dry air can quickly form spiral airflow in the mixing space 21, the turbulence condition of the hot dry air and low-temperature flue gas can be increased, the flue gas and the hot dry air can be fully mixed in the mixing space 21, and the occurrence of white smoke in a chimney can be avoided.

Example 5

On the basis of any of embodiments 1 to 4, this embodiment provides another flue gas treatment device, as shown in fig. 5 to 7, the flue gas treatment device includes a flue gas inlet pipe 1, a flue gas outlet pipe 2, and a plurality of heat exchange devices 3;

for any heat exchange device 3, the flue gas inlet pipe 1 is communicated with the inlet of a flue gas channel 34 of the heat exchange device 3, and the flue gas outlet pipe 2 is communicated with the outlet of the flue gas channel 34 of the heat exchange device 3; an air inlet pipe 31 is arranged on the heat exchange device 3, and the inlet end of the air inlet pipe 31 is communicated with the fan 4;

an air outlet pipe 32 is formed among the plurality of heat exchange devices 3, an opening 35 is arranged on a side wall of any one of the heat exchange devices 3 facing the air outlet pipe 32, the opening 35 is communicated with the air channel 33 of the heat exchange device 3, that is, the opening 35 can be regarded as an inlet end of the air outlet pipe 32, so that the air outlet pipe 32 is communicated with an outlet of the air channel 33 of the heat exchange device 3 through the opening 35, and an outlet end of the air outlet pipe 32 is communicated with the flue gas outlet pipe 2, so that the heat-exchanged air and the flue gas are mixed in the air outlet pipe 32.

Each heat exchange device 3 is arranged along the side wall of the shell of the flue gas treatment device, so that a flow space is formed among a plurality of heat exchange devices 3, the cross section of the shell is of a rectangular or square structure, as shown in fig. 5-6, 2 heat exchange devices 3 can be arranged and arranged on two opposite side surfaces of the shell; or 4 heat exchange devices 3 are arranged, and each heat exchange device is arranged to be close to the side wall of the shell; or, 3 heat exchange devices 3 are arranged on any three side walls of the shell;

specifically, as shown in fig. 6, the air outlet pipe 32 is a channel space formed by two heat exchange devices 3 arranged at intervals; as shown in fig. 7, the air outlet pipe 32 is surrounded by at least three heat exchange devices 3 to form a channel space;

the air outlet pipe 32 is an open mouth at one end close to the smoke outlet pipe 2, and the air outlet pipe 32 is provided with a sealing structure 9 at one end far away from the smoke outlet pipe 2 in consideration of the flowing direction of the air and the sealing performance; it can also be seen that the flue gas treatment device comprises a sealing structure 9, wherein the sealing structure 9 is connected with the side wall of the heat exchange device 3 facing the air outlet pipe 32, and is used for sealing one end of the air outlet pipe 32, so that the hot dry air after heat exchange can only flow towards the open mouth of the air outlet pipe 32.

As in embodiment 2, for any one of the heat exchangers 3, a velocity reduction tube 5 is arranged between the flue gas outlet tube 2 and the heat exchanger 3, an inlet end of the velocity reduction tube 5 is communicated with the flue gas channel 34 of the heat exchanger 3, and an outlet end of the velocity reduction tube 5 is communicated with the flue gas outlet tube 2; the demisting device 6 is arranged between the speed reducing pipe 5 and the flue gas outlet pipe 2, the inlet end of the demisting device 6 is connected with the outlet end of the speed reducing pipe 5, and the outlet end of the demisting device 6 is communicated with the flue gas outlet pipe 2.

In addition, a mixing pipe section 7 is arranged at one end, close to the heat exchange device 3, of the flue gas outlet pipe 2, the mixing pipe section 7 is communicated with an outlet end of the air outlet pipe 32 and an outlet end of the demisting device 6 respectively, so that hot dry air after heat exchange enters the mixing pipe section 7 through the air outlet pipe 32, low-temperature flue gas after heat exchange enters the mixing pipe section 7 after demisting through the demisting device 6, is mixed with the hot dry air after heat exchange, and then enters a main pipeline of the flue gas outlet pipe 2.

Meanwhile, the heat exchange device 3 is often a plate heat exchanger and is integrally of a cuboid structure or a cubic structure, the smoke outlet pipe 2 or the chimney is often a cylindrical pipe, for convenience of assembly, the mixing pipe section 7 is arranged as a transition pipe section, namely, the mixing pipe section 7 is a square opening at one end close to the heat exchange device 3, and the mixing pipe section 7 is a circular opening at one end far away from the heat exchange device 3, so that the bottom of the smoke treatment device is a main body of a square structure, the upper part of the smoke exhaust pipeline of the cylindrical structure is a smoke exhaust pipeline of the cylindrical structure, and the whole smoke exhaust pipeline is integrally of a round-top appearance.

In order to improve the mixing degree of hot dry air and low-temperature flue gas, a mixer 8 is arranged in the mixing pipeline section 7, and the air and the flue gas are forced to convect by external force, so that the air and the flue gas can be fully mixed; the mixer 8 is a conventional air mixing device, such as a fan blade and other conventional devices.

As for the heat exchange device 3, a plate heat exchanger is preferred in the present embodiment, wherein the plate heat exchanger is a conventional plate heat exchanger structure, or a plate heat exchanger structure in the applicant's earlier application, and the whole body of the plate heat exchanger structure is a rectangular parallelepiped structure or a cubic structure and is assembled by a plurality of heat exchange plate groups; for example, as shown in fig. 8, which is a structural drawing of a plate heat exchanger in the prior application of the applicant, the plate heat exchanger includes a plurality of heat exchange plate groups which are matched with each other; since the heat exchange device 3 is a conventional plate heat exchanger in the prior art, it will not be described in detail herein.

In the flue gas treatment device, the heat exchange device 3 is detachably disposed in the flue gas treatment device, and the heat exchange plate sets in the heat exchange device 3 are also detachably disposed in the flue gas treatment device, so that any one of the heat exchange plate sets in the heat exchange device 3 or any one of the heat exchange devices 3 can be detached from the flue gas treatment device, thereby facilitating maintenance or component replacement of the flue gas treatment device.

Example 6

As shown in fig. 1 to 7, this embodiment is modified based on any one of embodiments 1 to 5, specifically:

the embodiment is basically the same as any one of embodiments 1 to 5, except that a plurality of guide plates 22 are arranged on the inner wall of the flue gas outlet pipe 2, so that on one hand, flue gas is guided to flow along the flue gas outlet pipe 2, and on the other hand, the turbulence condition between flue gas components and air components in mixed flue gas is improved, which is beneficial to further improving the mixing degree of flue gas and air, ensuring that flue gas and air can be fully mixed, and avoiding the occurrence of white smoke from a chimney.

Example 7

This embodiment proposes a flue gas treatment method based on any one of embodiments 1 to 6, where the flue gas treatment method is applied to the flue gas treatment device, and specifically, the method includes the following steps:

s1, an air inlet process of the smoke and the air: the flue gas enters a flue gas channel 34 of the heat exchange device 3 through the flue gas inlet pipe 1, and the air enters an air channel 33 of the heat exchange device 3 through the air inlet pipe 31;

s2, heat exchange process of flue gas and air: in the heat exchange device 3, the flue gas exchanges heat with air;

s3, demisting the flue gas after heat exchange: the flue gas after heat exchange passes through a deceleration pipe 5 and a demisting device 6 to remove condensed liquid drops in the flue gas;

in addition, in step S3, a part of the liquid droplets is separated from the flue gas in the flue gas channel 34 or the deceleration pipe 5 by itself under the action of its own gravity, and another part of the liquid droplets carried by the flue gas is separated from the flue gas by the defogging device 6.

S4, mixing the air after heat exchange and the flue gas after demisting: the air after heat exchange passes through the air outlet pipe 32, enters the flue gas outlet pipe 2 and is mixed with the demisted flue gas;

specifically, for the structure in embodiment 3, the air after heat exchange passes through the air outlet pipe 32, flows into the mixing space 21 along the direction tangential to the flue gas outlet pipe 2, forms a spiral air flow, and is mixed with the demisted flue gas;

for the structure in embodiment 5, the heat-exchanged air enters the air outlet pipe 32 from the outlet 35, and enters the mixing pipeline 7 along the air outlet pipe 32, and is mixed with the demisted flue gas under the driving of the flow mixer 8 to form mixed flue gas, and enters the flue gas outlet pipe 2.

S5, flue gas emission process: the mixed flue gas is discharged out of the flue gas treatment device through the flue gas outlet pipe 2.

In step S5, the flue gas outlet pipe 2 may be communicated with a chimney, or the flue gas outlet pipe 2 with a sufficient length may be directly used as the chimney, so as to realize the outward discharge of the flue gas.

In addition, the utility model also provides a flue gas treatment system, the flue gas treatment system includes the flue gas treatment device, and also includes the conventional desulphurization unit in the prior art, exhaust-heat boiler etc. when installing the flue gas treatment device, can directly communicate flue gas inlet pipe 1 with the flue gas outlet of desulfurizing tower, or directly communicate flue gas inlet pipe 1 with the flue gas outlet of exhaust-heat boiler etc.; and then the flue gas outlet pipe 2 is communicated with a chimney, or the flue gas outlet pipe 2 with enough length is directly used as the chimney to realize the outward discharge of the flue gas. The rest components and the assembly relationship in the flue gas treatment system are all the prior art, and are not described herein again.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. The utility model provides a flue gas processing apparatus, its characterized in that, flue gas processing apparatus includes flue gas inlet pipe (1), flue gas outlet pipe (2), heat transfer device (3), air inlet pipe (31), air outlet pipe (32), flue gas inlet pipe (1) and heat transfer device's (3) flue gas passageway (34) import intercommunication, flue gas outlet pipe (2) and heat transfer device's (3) flue gas passageway (34) export intercommunication, the entrance point of air outlet pipe (32) and heat transfer device's (3) air channel (33) export intercommunication, the exit end and the flue gas outlet pipe (2) intercommunication of air outlet pipe (32) for air and flue gas after the heat transfer mix in air outlet pipe (32), and in flue gas passageway (34), the flow direction of flue gas is vertical upwards.

2. A flue gas treatment device according to claim 1, wherein a velocity reduction pipe (5) is arranged between the flue gas outlet pipe (2) and the heat exchange device (3), the inlet end of the velocity reduction pipe (5) is communicated with the flue gas channel (34) of the heat exchange device (3), and the outlet end of the velocity reduction pipe (5) is communicated with the flue gas outlet pipe (2).

3. A flue gas treatment device according to claim 2, characterized in that the flue gas treatment device comprises a demister (6), the demister (6) being arranged between the velocity reduction pipe (5) and the flue gas outlet pipe (2), the inlet end of the demister (6) being connected to the outlet end of the velocity reduction pipe (5), the outlet end of the demister (6) being connected to the flue gas outlet pipe (2).

4. A flue gas treatment device according to claim 1, wherein the inlet end of the flue gas outlet pipe (2) is in communication with the outlet of the flue gas channel (34) of the heat exchange device (3), and the outlet end of the flue gas outlet pipe (2) is in communication with a chimney or the outside atmosphere.

5. A flue gas treatment device according to claim 1, wherein the outlet end of the air outlet pipe (32) is connected to the side wall of the flue gas outlet pipe (2), and the air outlet pipe (32) extends through the side wall of the flue gas outlet pipe (2) and communicates with the mixing space (21) in the flue gas outlet pipe (2).

6. A flue gas treatment device according to claim 1, wherein the outlet of the air outlet pipe (32) is tangential to the flue gas outlet pipe (2).

7. A flue gas treatment device according to claim 6, wherein the air outlet pipe (32) comprises an outlet section (321), a guiding section (322) and a tangential inflow section (323) which are connected in sequence, the outlet section (321) is communicated with the outlet of the air channel (33) of the heat exchange device (3), the tangential inflow section (323) is tangent and connected with the flue gas outlet pipe (2), and the guiding section (322) is smoothly and transitionally connected with the outlet section (321) and the tangential inflow section (323) respectively.

8. A flue gas treatment device according to claim 1, characterized in that the flue gas treatment device comprises a plurality of heat exchange devices (3), an air outlet pipe (32) is formed between the plurality of heat exchange devices (3), and an opening (35) is provided on the side wall of any one of the heat exchange devices (3) facing the air outlet pipe (32), wherein the opening (35) is communicated with the air channel (33) of the heat exchange device (3).

9. A flue gas treatment system, characterized in that the system comprises a flue gas treatment device according to any one of claims 1-8.

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