CN110090521A - A kind of dedusting of flue gas end takes off white system - Google Patents

Abstract

The invention discloses a flue gas terminal dust removal and whitening system, which relates to the field of air pollution control. The invention comprises: a dust removal box, the bottom of the dust removal box is provided with a sedimentation tank with an upward opening; a flue gas inlet flue, the flue gas inlet flue is introduced from the outside of the dust removal box into the interior of the dust removal box and passes through the sedimentation tank Arrive at the top of the sedimentation tank; the first-level dust removal and dehydration area and the second-level dust removal and dehydration area located inside the dust removal box, the second-level dust removal and dehydration area is located above the first-level dust removal and dehydration area, and the first-level dust removal and dehydration area is located above the sedimentation tank; the first-level dust removal Both the dehydration zone and the secondary dedusting dehydration zone include several layers of heat pipe heat exchange layers and filter dust removal layers distributed at intervals; and a flue gas outlet flue, which is connected to the top of the dust removal box. The purpose of the invention is to further remove dust from industrial flue gas to achieve nearly zero emission and eliminate white smoke under the condition of low cost and low energy consumption.

Description

A dust removal and whitening system at the end of flue gas

technical field

The invention relates to the field of air pollution control, and more specifically relates to a dust removal and whitening system at the end of flue gas, which is suitable for the treatment of industrial flue gas pollutants such as primary flue gas at the end of industrial furnaces, especially converter steelmaking.

Background technique

In recent years, with the gradual increase of my country's economic strength and stricter environmental protection standards, the emission standards of major pollutants have been subject to near-zero emission requirements. According to the national standard "Emission Standard of Air Pollutants for the Steelmaking Industry GB28664-2012", the emission concentration of primary flue gas particulate matter in the existing steelmaking enterprises is required to be below 100mg/ ^m Air particulate matter emission concentration is below 50mg/m ³ . At present, the dust concentration in primary steelmaking flue gas emission in large iron and steel enterprises is about 50-30 mg/m ³ . With the stricter environmental protection standards, the dust concentration of the primary flue gas emission will be further reduced until it reaches near-zero emission.

At present, there are two main types of dust removal for converter flue gas. One is wet dust removal system (mainly OG method), which cools down the flue gas and removes dust through spraying water and annular venturi tube. This method makes the flue gas fully wet The flue gas is saturated with water; the other is dry dust removal (mainly the LT method), which ionizes the gas through the strong corona field formed by the electrodes, and the dust and mist particles obtain electrons and charge them. Particles are captured on the dust collecting plate under the joint action of water mist collision, adsorption and condensation, so as to achieve the purpose of ash removal. The OG method can remove more than 95% of the dust content in the flue gas, reducing the dust content of the flue gas to less than 30mg/ ^m3 ; the LT method can remove 99% of the dust content of the flue gas, reducing the dust content to 10mg/ ^m3 below, and save a lot of water resources. But currently the most widely used is still the OG dust removal system, this application is mainly aimed at the rear flue gas of the OG dust removal system. Although the current OG method is effective, there are still a lot of fine dust with a particle size below 10 μm in the flue gas, and the flue gas temperature is about 80 °C. At present, in the face of increasingly stringent environmental protection requirements, the requirements for dust content in flue gas will become higher and higher. The dust concentration of 30mg/ ^m3 is still relatively high, and there is still a large room for improvement. However, the current OG method is difficult to achieve further efficient removal of smoke and dust, and consumes a large amount of water and power resources, and the investment cost is too high, which is not conducive to large-scale application, and will also cause the flue gas to contain saturated water (>300g/kg dry Smoke), white smoke (caused by condensation of smoke and precipitation of water vapor) is formed after being discharged from the chimney. Although white smoke is harmless to the environment, it affects the appearance of the city.

In the prior art, there have been relevant patent disclosures about the technical solutions of the flue gas dust removal system and dust removal method, such as patent publication number: CN 105107365 A, publication date: December 02, 2015, and the name of the invention is: flue gas composite phase transition Dust removal and desulfurization process and device. This application discloses a flue gas composite phase change dust removal and desulfurization device inside the desulfurization tower. The flue gas is swirled obliquely downward by the swirling effect of the vortex phase changer at the flue entrance and enters the desulfurization tower. , the vortex phase changer is composed of multiple groups of atomizing nozzles arranged tangentially at four corners, which can fully wet the flue gas and make the dusty droplets collide and grow up. The flue gas entering the desulfurization tower passes through the desulfurization nozzle arranged above. The spray layer removes most of the dust particles and SO ₂ , and the remaining wet flue gas and a small amount of smoke pass through the high-efficiency demister above to further remove moisture and fine dust and discharge it into the atmosphere. The dust removal and desulfurization device of this application makes the flue gas supersaturated with water to remove the dust by spraying water mist and strengthening collision, and removes SO ₂ through the desulfurization spray layer. The dust removal and desulfurization efficiency is high, and the device is simple and the investment is small. However, the water saturation is increased by spraying, the water consumption is large, clean water needs to be continuously replenished, and a large amount of electric energy is consumed, and the dust removal method is relatively rough, so it is difficult to achieve fine dust removal. It is suitable for front-end dust removal, but not for end-end dust removal.

Another example is the patent publication number: CN 206730770 U, publication date: December 12, 2017, and the name of the invention is: a wet method flue gas desulfurization phase change condensation and dedusting and mist removal device, the application discloses a wet method Flue gas desulfurization phase change condensation and dedusting and mist removal device, the flue gas enters from the middle of the absorption tower, the upper end of the inlet flue is equipped with a spray layer, and the upper end of the spray layer is sequentially equipped with a pipe grid cooler and a mist eliminator, and in the pipe grid type The upper end of the cooler and the demister is provided with the flushing nozzle of the cooler and the rinsing nozzle of the demister in turn, and the lower end of the absorption tower is a sedimentation tank. The dust and mist removal device in this application can effectively improve the comprehensive dust removal effect of the wet desulfurization device, and significantly reduce the concentration of smoke and dust in the flue gas at the outlet of the absorption tower. However, the above dust and mist removal devices also have relatively large deficiencies. Among them, the heat exchange medium of the tube-grid heat exchanger uses circulating water, which consumes water resources, and has low heat exchange efficiency, large volume, and heavy weight of the absorption tower; Heaters and mist eliminators are arranged in sequence and flushing nozzles are distributed. The equipment layout is complicated, maintenance is difficult, and it is difficult to achieve fine dust removal.

To sum up, how to further remove dust from industrial flue gas to achieve near-zero emissions and achieve the goal of eliminating white smoke is a technical problem that needs to be solved urgently in the prior art.

The information disclosed in this Background section is only for enhancing the understanding of the general background of the present invention and should not be taken as an acknowledgment or any form of suggestion that the information constitutes the prior art that is already known to those skilled in the art.

Contents of the invention

1. The technical problem to be solved by the invention

The invention provides a dust removal and whitening system at the end of flue gas. The purpose of the invention is to further remove dust from industrial flue gas to achieve near-zero emission and eliminate white smoke under the condition of low cost and low energy consumption.

2. Technical solution

In order to achieve the above object, the technical scheme provided by the invention is:

The flue gas terminal dust removal and whitening system of the present invention includes:

A dust removal box, the bottom of the dust removal box is provided with a sedimentation tank with an upward opening;

The flue gas inlet flue, the flue gas inlet flue is introduced from the outside of the dust removal box to the inside of the dust removal box and passes through the sedimentation tank to reach the top of the sedimentation tank;

The first-level dust removal and dehydration area and the second-level dust removal and dehydration area located inside the dust removal box, the second-level dust removal and dehydration area is located above the first-level dust removal and dehydration area, and the first-level dust removal and dehydration area is located above the sedimentation tank; Both the primary dust removal and dehydration zone and the secondary dust removal and dehydration zone include several layers of heat pipe heat exchange layers and filter screen dust removal layers that are spaced apart from each other;

And a flue gas outlet flue, the flue gas outlet flue is connected to the top of the dust removal box.

As a further improvement of the present invention, spray units are respectively installed above the primary dust removal and dehydration area and above the secondary dust removal and dehydration area.

As a further improvement of the present invention, the opening at the top of the sedimentation tank is covered with an orifice plate, and several water holes are opened on the orifice plate.

As a further improvement of the present invention, each heat pipe heat exchange layer includes several heat pipes arranged in parallel, and the evaporation section of the heat pipes is located inside the dust removal box, and the condensation section of the heat pipes is located outside the dust removal box.

As a further improvement of the present invention, the dust removal layer of the filter screen includes a support frame on which a filter screen is laid.

As a further improvement of the present invention, several storage boards are fixed on the inner wall of the dust removal box, and the support frame is supported on the storage boards.

As a further improvement of the present invention, the opening end of the flue gas inlet flue located above the sedimentation tank is arranged vertically upward, and a wind cap is arranged above the opening end, and the top surface of the wind cap is an upwardly protruding arc surface. And the vertical downward projection of the top surface of the hood covers the opening end.

As a further improvement of the present invention, the part below the top surface of the wind cap is a cone with the apex facing downwards, and several ventilation grooves are arranged at intervals on the outer surface of the cone, and the ventilation grooves are located on the cone. on the bus.

As a further improvement of the present invention, an opening is provided at the bottom of the sedimentation tank, and a sealing plug is installed on the opening.

As a further improvement of the present invention, a flue gas inlet observation hole is provided on the side wall of the dust removal box near the top of the sedimentation tank, and a flue gas outlet observation hole is provided on the side wall of the dust removal box near the flue gas outlet flue. hole.

3. Beneficial effect

Compared with the prior art, the technical solution provided by the invention has the following remarkable effects:

(1) In the present invention, a multi-stage dust removal and dehydration zone is arranged to cool the flue gas in stages to achieve the purpose of dust removal and dehydration, and the temperature of the exhaust gas can be controlled; the heat exchange layer of the heat pipe and the dust removal layer of the filter screen are arranged at intervals, which is beneficial to adjust the dust removal in the dust removal box. The temperature makes the water vapor in the flue gas continuously condense and grow up with the fine dust as the condensation core, and the dust removal and dehydration efficiency is high.

(2) The dust removal and whitening system of the present invention can be invested in one time, and the flue gas is cooled by natural air cooling during operation, without consuming other power and hardly consuming cooling water.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

Fig. 1 is the structural schematic diagram of the flue gas terminal dedusting and whitening system in the embodiment;

Fig. 2 is a schematic cross-sectional structure diagram along A-A direction in Fig. 1;

Fig. 3 is the structural representation of filter screen dedusting unit in the embodiment;

Fig. 4 is a flow chart of the method for dust removal and whitening at the end of flue gas in the embodiment.

Explanation of the labels in the schematic diagram: 1. Flue gas inlet flue; 2. Primary dust removal and dehydration area; 3. Secondary dust removal and dehydration area; 4. Flue gas outlet flue; 5. Spray unit; 6. Sedimentation tank; 7 , sealing plug; 8, orifice plate; 9, flue gas inlet observation hole; 10, flue gas outlet observation hole; 11, heat pipe; 12, filter screen dust removal layer; 1201, support frame; 1202, filter screen; 13, dust removal box Body; 1301, storage board; 14, hood.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

In order to further understand the content of the present invention, the present invention will be described in detail in conjunction with the accompanying drawings and embodiments.

Example 1

Referring to Figures 1-3, the flue gas terminal dust removal and whitening system of this embodiment includes:

A dust removal box 13, the bottom of the dust removal box 13 is provided with a sedimentation tank 6 with an upward opening;

The flue gas inlet flue 1, the flue gas inlet flue 1 is introduced from the outside of the dust removal box 13 to the inside of the dust removal box 13 and passes through the sedimentation tank 6 to reach the top of the sedimentation tank 6;

The first-level dust removal and dehydration area 2 and the second-level dust removal and dehydration area 3 located inside the dust removal box 13, the second-level dust removal and dehydration area 3 is located above the first-level dust removal and dehydration area 2, and the first-level dust removal and dehydration area 2 is located above the sedimentation tank 6; The first-stage dedusting and dehydration zone 2 and the secondary dedusting and dehydration zone 3 all include several layers of heat pipe heat exchange layers and filter screen dust removal layers 12 distributed at intervals; The heat exchange layer of the heat pipe.....The interval distribution forms the first-level dust removal and dehydration area 2 or the second-level dust removal and dehydration area 3)

And the flue gas outlet flue 4, the flue gas outlet flue 4 communicates with the top of the dust removal box 13.

In this embodiment, the flue gas after wet dedusting enters the dust removal box 13 through the flue gas inlet flue 1, because the flue gas inlet flue 1 is introduced into the dust removal box 13 from the outside of the dust removal box 13 and passes through the sediment The tank 6 reaches the top of the sedimentation tank 6. When the flue gas circulates in the flue gas inlet flue 1 located in the sedimentation tank 6, the water stored in the sedimentation tank 6 will exchange heat with the flue gas, so that the flue gas from the flue gas inlet flue 1 The flue gas flowing out of the interior is pre-cooled to a certain extent, and then the flue gas is sequentially processed through the first-level dust removal and dehydration zone 2 and the second-level dust removal and dehydration zone 3. Small droplets, part of the water vapor condenses and grows on the surface of the heat pipe, falls into the lower filter dust removal layer 12 under the action of gravity, collides, grows up, and finally falls into the sedimentation tank 6, and part of the small droplets are carried by the flue gas into the upper The dust removal layer 12 of the filter screen gradually collides and grows, and finally falls into the sedimentation tank 6 below, and the flue gas after fine dust removal and dehydration after the first-level dust removal and dehydration zone 2 and the second-level dust removal and dehydration zone 3 passes through the flue gas outlet flue 4 is discharged into the atmosphere, the temperature of the discharged flue gas is about 50°C, the dust content and water content are significantly reduced, and the white smoke is eliminated. It should be noted that the interior of the dust removal box 13 in this embodiment is not limited to the first-level dust removal and dehydration area 2 and the second-level dust removal and dehydration area 3, and the third-level dust removal and dehydration area and the fourth-level dust removal and dehydration area can also be set above the second-level dust removal and dehydration area 3. Dust removal and dehydration area... How many levels of dust removal and dehydration area to set up is determined by the actual installation and use.

The existing flue gas dust removal technology can reduce the amount of dust to below 30mg/m ³ , but it is difficult to achieve further dust removal of the flue gas under the premise of low cost and low energy consumption, that is, to achieve near-zero emissions, and the dust removal in the prior art The gas contains a lot of moisture, which can easily lead to white smoke emission. The purpose of this embodiment is to further remove dust from industrial flue gas to achieve near-zero emission and eliminate white smoke under the condition of low cost and low energy consumption. Specifically, in this embodiment, a multi-stage dust removal and dehydration zone is arranged, and the flue gas is cooled in stages to achieve dust removal and dehydration Purpose, and can control the exhaust gas temperature; the heat exchange layer of the heat pipe and the dust removal layer 12 of the filter screen are arranged at intervals, which is beneficial to adjust the temperature inside the dust removal box 13, so that the water vapor in the flue gas will continue to condense and grow by colliding with the fine dust as the condensation core. The dust removal and dehydration efficiency is high; the dust removal and whitening system of this embodiment can be invested in one time, and the flue gas is cooled by natural air cooling during operation, without consuming other power and hardly consuming cooling water.

Example 2

The structure of the dust removal and whitening system at the end of the flue gas in this embodiment is basically the same as that of Embodiment 1, and further: the top of the first-level dust removal and dehydration area 2 and the top of the second-level dust removal and dehydration area 3 are respectively installed with spray units 5 (specifically In this embodiment, the spraying unit 5 includes a water pipe arranged horizontally, and several nozzles are installed on the water pipe).

In this embodiment, spray units 5 are respectively installed above the primary dedusting and dehydrating area 2 and above the secondary dedusting and dehydrating area 3. There is a small amount of sticky matter on the surface of the net dust removal layer 12, and the spray unit 5 above the first-level dust removal and dehydration area 2 and the spray unit 5 above the second-level dust removal and dehydration area 3 can be opened for washing to ensure the reliability of the system operation.

Example 3

The structure of the dust removal and whitening system at the end of the flue gas in this embodiment is basically the same as in Embodiment 2, further: the opening at the top of the sedimentation tank 6 is covered with an orifice plate 8, and several water holes are opened on the orifice plate 8 .

In this embodiment, the opening at the top of the sedimentation tank 6 is covered with an orifice 8, and the orifice 8 is provided with a plurality of water holes, and the moisture falling from the top of the sedimentation tank 6 can enter the sedimentation tank 6 along the water holes. Storage, other bonded dust and particles are blocked on the orifice plate 8, which can be cleaned regularly.

Example 4

The structure of the dust removal and whitening system at the end of the flue gas in this embodiment is basically the same as that of Embodiment 3, further: each layer of heat pipe heat exchange layer includes several heat pipes 11 arranged in parallel with each other, and the evaporation section of the heat pipes 11 is located in the dust removal box Inside the body 13 , the condensation section of the heat pipe 11 is located outside the dust removal box 13 .

In this embodiment, each heat pipe heat exchange layer includes several heat pipes 11 arranged parallel to each other, and the evaporation section of the heat pipes 11 is located inside the dust removal box 13, and the condensation section of the heat pipes 11 is located outside the dust removal box 13. During the evaporation section of the heat pipe 11 inside the dust removal box 13, the heat is quickly absorbed, and then the absorbed heat of the flue gas is released to the outside of the dust removal box 13 in time through the working medium in the heat pipe 11.

Example 5

The dust removal and whitening system at the end of the flue gas in this embodiment has the same structure as that of Embodiment 4, and further: the filter screen dust removal layer 12 includes a support frame 1201, and a filter screen 1202 is laid on the support frame 1201 (specifically, the filter screen 1202 of this embodiment Among them, the support frame 1201 is a rectangular frame fixed on the inner wall of the dust removal box 13, the support frame 1201 is covered with a filter screen 1202, and the edge of the filter screen 1202 is fixed on the edge of the support frame 1201 by screws.)

In this embodiment, the filter dust removal layer 12 includes a support frame 1201, and the support frame 1201 is covered with a filter screen 1202, through which the moisture and dust in the flue gas are blocked and adsorbed, and the dust removal of the flue gas can be effectively realized. off white.

Example 6

The structure of the dust removal and whitening system at the end of the flue gas in this embodiment is basically the same as that in Embodiment 5, further: several storage boards 1301 are fixed on the inner wall of the dust removal box 13, and the support frame 1201 is supported on the storage boards 1301 (specifically in this embodiment, at the same level, a storage board 1301 is respectively provided on the four surfaces of the inner wall of the dust removal box 13, and a support frame 1201 is placed above the four storage boards 1301).

In this embodiment, several storage boards 1301 are fixed on the inner wall of the dust removal box 13, and the support frame 1201 is supported on the storage boards 1301, which greatly facilitates the installation and disassembly of the support frame 1201.

Example 7

The structure of the dust removal and whitening system at the end of the flue gas in this embodiment is basically the same as that in Embodiment 6, further: the opening end of the flue gas inlet flue 1 located above the sedimentation tank 6 is set vertically upward, and a wind cap is arranged above the opening end 14. The top surface of the wind cap 14 is an upwardly protruding arc surface, and the vertical downward projection of the top surface of the wind cap 14 covers the opening end (specifically in this embodiment, referring to FIG. 1 , the edge part of the wind cap 14 passes through connecting rod attached to the open end).

In this embodiment, the opening end of the flue gas inlet flue 1 located above the sedimentation tank 6 is set vertically upward, and a wind cap 14 is arranged above the opening end. The top surface of the wind cap 14 is an upwardly convex arc surface, and the wind cap The vertical downward projection of the top surface of 14 covers the opening end. When there is moisture, dust and particles falling above the sedimentation tank 6, it will first fall on the top surface of the wind cap 14, and then slide down to the hole along the top surface of the wind cap 14. On the plate 8, moisture, dust, and particles are effectively prevented from falling into the flue gas inlet flue 1.

Example 8

The structure of the flue gas end dust removal and whitening system in this embodiment is basically the same as that in Embodiment 7, further: the part below the top surface of the wind cap 14 is a cone with the apex facing downward, and the outer surface of the cone is provided with Several ventilation grooves are located on the generatrix of the cone.

In this embodiment, the part below the top surface of the wind cap 14 is a cone with the apex facing downwards. Several ventilation grooves are arranged at intervals on the outer surface of the cone. The ventilation grooves are located on the generatrix of the cone. The flue gas discharged from the opening end of the flue 1 above the sedimentation tank 6 is diverted and dispersed along several ventilation grooves on the wind cap 14, so that the flue gas can fully flow in the first-level dust removal and dehydration area 2 and the second-level dust removal and dehydration area. Diffusion in 3, which significantly improves the effect of dust removal and whitening of flue gas.

Example 9

The dust removal and whitening system at the end of flue gas in this embodiment has basically the same structure as in Embodiment 8, further: the bottom of the sedimentation tank 6 is provided with an opening, and a sealing plug 7 is installed on the opening (specifically in this embodiment, the sealing Plug 7 is a pressure handle type rubber plug).

In this embodiment, the bottom of the sedimentation tank 6 is provided with an opening, and a sealing plug 7 is installed on the opening. When the water in the sedimentation tank 6 accumulates to a certain extent, the sealing plug 7 at the bottom of the sedimentation tank 6 can be opened to discharge excess water .

Example 10

The structure of the dust removal and whitening system at the end of the flue gas in this embodiment is basically the same as that of Embodiment 9, further: the side wall of the dust removal box 13 near the top of the sedimentation tank 6 is provided with a flue gas inlet observation hole 9, and the dust removal box 13 A flue gas outlet observation hole 10 is provided on the side wall near the flue gas outlet flue 4 .

In this embodiment, the side wall of the dust removal box 13 near the top of the sedimentation tank 6 is provided with a flue gas inlet observation hole 9, and the side wall of the dust removal box 13 near the flue gas outlet flue 4 is provided with a flue gas outlet observation hole 10. Through the flue gas inlet observation hole 9 and the flue gas outlet observation hole 10, the dust removal and whitening effect of the flue gas in the dust removal box 13 can be compared and observed, and the dust removal box 13 can be regularly inspected and maintained.

Example 11

The dust removal and whitening system at the end of the flue gas in this embodiment has basically the same structure as that in Embodiment 10, and further: the evaporation section of the heat pipe 11 is a light pipe, which is conducive to the condensation, growth and fall of the water vapor in the flue gas on the surface of the light pipe , the condensation section of the heat pipe 11 is a finned tube, which strengthens the heat exchange with the external environment; the lowermost layer of the first-stage dust removal and dehydration zone 2 is the heat exchange layer of the heat pipe, and the flue gas is cooled first, which is conducive to improving the subsequent dust removal effect; the flue gas The part of the inlet flue 1 located inside the sedimentation tank 6 includes a coil section (that is, a spiral piping system), through which the heat in the flue gas can be efficiently transferred to the water in the sedimentation tank 6, improving the flue gas. The effect of dedusting and whitening after the gas is removed; the surface of the evaporation section of the heat pipe 11 is coated with a non-stick anti-corrosion coating (i.e. a polytetrafluoroethylene coating), and the ultra-low surface energy of the non-stick anti-corrosion coating makes the water vapor precipitated on the surface of the heat pipe 11 form a beaded and fall quickly under the action of gravity, avoiding the formation of film-like condensation and deteriorating heat transfer, and will not form scale or sticky matter on the surface of the heat pipe 11. The surface of 1202 is easy to reunite into liquid droplets and fall quickly under the action of gravity. It will not form a water film on the surface of the filter 1202 to increase the smoke resistance, and will not form scale or sticky matter on the surface of the filter 1202 to cause blockage. The above settings It is conducive to the removal of water vapor, dust and particles, and improves the effect of dust removal and whitening; in the first-level dust removal and dehydration area 2 and the second-level dust removal and dehydration area 3, the heat pipes 11 on the heat exchange layers of the adjacent two layers of heat pipes are perpendicular to each other, and the above The orthogonal arrangement of the heat pipes 11 improves the uniformity and efficiency of heat exchange in the entire primary dedusting and dehydrating zone 2 and the secondary dedusting and dehydrating zone 3, thereby improving the dedusting and whitening effect.

Example 12

The structure of the dust removal and whitening system at the end of the flue gas in this embodiment is basically the same as in Embodiment 11. Further: in this embodiment, the heat pipe 11 is a negative pressure heat pipe, and the working medium in the heat pipe 11 can be water, acetic acid, methanol , acetone, etc. and control the phase transition temperature (ie, boiling point) of the working medium in the heat pipe 11 to be between 45 and 70°C, and control the mesh number of the filter screen 1202 to be between 30 and 60 mesh; among them: the primary dust removal and dehydration zone 2 The phase transition temperature of the working fluid in the middle heat pipe 11 is higher than the phase transition temperature of the working fluid in the heat pipe 11 in the secondary dust removal and dehydration zone 3; The aperture of 1202; Specifically in the present embodiment, the working medium in the heat pipe 11 in the first-level dedusting and dehydration zone 2 is methyl alcohol, and its phase transition temperature is controlled at 60° C., and the working medium in the heat pipe 11 in the second-level dedusting and dehydration zone 3 is acetone. The phase change temperature is controlled at 45°C; the mesh number of the filter screen 1202 in the primary dust removal and dehydration zone 2 is 35 mesh, and the mesh number of the filter screen 1202 in the secondary dust removal and dehydration zone 3 is 50 mesh.

In this embodiment, the apertures of the filter screen 1202 in the first-level dust removal and dehydration area 2 and the second-level dust removal and dehydration area 3 are designed to be different, and the phase change temperature of the working medium in the heat pipe 11 is different, specifically the filter screen 1202 meshes in the second-level dust removal and dehydration area 3 The number is greater than the 1202 mesh number of the filter screen in the first-level dust removal and dehydration zone 2, and the phase transition temperature of the working fluid in the heat pipe 11 in the first-level dust removal and dehydration zone 2 is greater than the phase transition temperature of the working fluid in the heat pipe 11 in the second-level dust removal and dehydration zone 3, so that The temperature difference between the working medium and the flue gas in the heat pipe 11 in the dust removal and dehydration zone of the same level is increased, the heat exchange rate is increased, and the temperature of the flue gas is reduced, so that the moisture content and dust content of the flue gas are reduced more obviously. The different pore diameters of the filter screen 1202 in the dust removal and dehydration area reduce the moisture content of the flue gas in the next stage of dust removal and dehydration area and the particle size of the precipitated water is smaller. The finer filter screen 1202 helps the water droplets to collide, fuse and grow up and be absorbed Remove, and finally improve the effect of dust removal and whitening.

Example 13

Referring to FIG. 4 , the method for dust removal and whitening at the end of flue gas based on the dust removal and whitening system at the end of flue gas in Embodiment 12 of this embodiment includes the following steps:

Step A: Prepare the flue gas terminal dust removal and whitening system, set the working medium in the heat pipe 11 in the first-level dust removal and dehydration zone 2 as methanol, and control its phase transition temperature to 60°C; set the working fluid in the heat pipe 11 in the second-level dust removal and dehydration zone 3 The substance is acetone, and the phase transition temperature is controlled at 45° C.; the mesh number of the filter screen 1202 in the first-level dust removal and dehydration zone 2 is set to 35 mesh, and the mesh number of the filter screen 1202 in the second-level dust removal and dehydration zone 3 is set to 50 mesh;

Step B: Pass the flue gas into the flue gas inlet flue 1, and when the flue gas circulates in the flue gas inlet flue 1 located in the sedimentation tank 6, the temperature of the flue gas is lowered due to heat exchange with the water stored in the sedimentation tank 6 ;

Step C: The flue gas is discharged from the opening end of the flue gas inlet flue 1 above the sedimentation tank 6, and the discharged flue gas is diverted and dispersed along several ventilation grooves on the wind cap 14;

Step D: After the flue gas is dedusted and dehydrated through the primary dust removal and dehydration zone 2 and the secondary dust removal and dehydration zone 3, it is discharged from the flue gas outlet flue 4.

The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be described in the foregoing embodiments Modifications are made to the recorded technical solutions, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. a kind of dedusting of flue gas end takes off white system, characterized by comprising:

Dust-removing box (13), the internal bottom of the dust-removing box (13) are equipped with the sedimentation basin (6) of opening upwards；

Smoke inlet flue (1), it is internal simultaneously which introduces dust-removing box (13) from outside dust-removing box (13) It is reached above sedimentation basin (6) across sedimentation basin (6)；

The primary dust removing drying zone (2) and two-stage dust removal drying zone (3) internal positioned at dust-removing box (13), the two-stage dust removal are de- Pool (3) is located at the top of the primary dust removing drying zone (2), and the primary dust removing drying zone (2) is located on sedimentation basin (6) Side；The primary dust removing drying zone (2) and the two-stage dust removal drying zone (3) include the several layers heat pipe for being spaced apart from each other distribution Heat exchange layer and strainer remove knoisphere (12)；

And exhanst gas outlet flue (4), the exhanst gas outlet flue (4) are connected to dust-removing box (13) top.

2. flue gas end according to claim 1 dedusting takes off white system, it is characterised in that: the primary dust removing drying zone (2) top and the two-stage dust removal drying zone (3) top respectively correspond and are equipped with spray unit (5).

3. flue gas end according to claim 1 dedusting takes off white system, it is characterised in that: sedimentation basin (6) top Opening covers abacus (8), offers several limbers on the orifice plate (8).

4. flue gas end according to claim 1 dedusting takes off white system, it is characterised in that: if every layer of heat pipe heat exchanging layer includes The dry heat pipe (11) being arranged parallel to each other, and the evaporator section of heat pipe (11) is located at dust-removing box (13) inside, heat pipe (11) It is external that condensation segment is located at dust-removing box (13).

5. flue gas end according to claim 4 dedusting takes off white system, it is characterised in that: the strainer is wrapped except knoisphere (12) Braced frame (1201) are included, are covered with strainer (1202) in the braced frame (1201).

6. flue gas end according to claim 5 dedusting takes off white system, it is characterised in that: the dust-removing box (13) it is interior Several parcel shelf (1301) are fixed on side wall, the braced frame (1201) is supported on parcel shelf (1301).

7. flue gas end according to claim 1 dedusting takes off white system, it is characterised in that: the smoke inlet flue (1) Open end above sedimentation basin (6) is arranged vertically upwards, and blast cap (14), the blast cap are provided with above the open end (14) top surface is the arc surface to raise upward, and the projection of blast cap (14) top surface straight down covers the open end.

8. flue gas end according to claim 7 dedusting takes off white system, it is characterised in that: below blast cap (14) top surface Part be vertex cone directed downwardly, be equipped at intervals with several ventilation grooves on the outer surface of the cone, it is described divulge information it is recessed Slot position is on the bus of the cone.

9. flue gas end according to claim 1 dedusting takes off white system, it is characterised in that: the bottom of the sedimentation basin (6) Equipped with opening, sealing-plug (7) are installed in the opening.

10. flue gas end dedusting described in -9 any one takes off white system according to claim 1, it is characterised in that: the dedusting Side wall of the cabinet (13) above sedimentation basin (6) is equipped with smoke inlet peep hole (9), and the dust-removing box (13) is close to cigarette The side wall of gas exhaust pass (4) is equipped with exhanst gas outlet peep hole (10).