CN109045906B - Integrated tower, device and method for realizing purification of flue gas containing coal dust - Google Patents
Integrated tower, device and method for realizing purification of flue gas containing coal dust Download PDFInfo
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- CN109045906B CN109045906B CN201810989247.9A CN201810989247A CN109045906B CN 109045906 B CN109045906 B CN 109045906B CN 201810989247 A CN201810989247 A CN 201810989247A CN 109045906 B CN109045906 B CN 109045906B
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- 239000002817 coal dust Substances 0.000 title claims abstract description 84
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 239000003546 flue gas Substances 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000000746 purification Methods 0.000 title claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 75
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 66
- 238000009835 boiling Methods 0.000 claims abstract description 63
- 238000005406 washing Methods 0.000 claims abstract description 45
- 239000002002 slurry Substances 0.000 claims abstract description 38
- 238000009826 distribution Methods 0.000 claims abstract description 32
- 239000007789 gas Substances 0.000 claims description 32
- 239000003245 coal Substances 0.000 claims description 12
- 239000012719 wet electrostatic precipitator Substances 0.000 claims description 8
- 239000002351 wastewater Substances 0.000 claims description 7
- 238000001556 precipitation Methods 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 4
- 238000004064 recycling Methods 0.000 claims description 4
- 230000001502 supplementing effect Effects 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 239000003415 peat Substances 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 description 19
- 238000003825 pressing Methods 0.000 description 16
- 239000000428 dust Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 11
- 230000005611 electricity Effects 0.000 description 7
- 230000002209 hydrophobic effect Effects 0.000 description 7
- 230000000704 physical effect Effects 0.000 description 5
- 238000000889 atomisation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000011010 flushing procedure Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000012717 electrostatic precipitator Substances 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000005367 electrostatic precipitation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention discloses an integrated tower, a device and a method for purifying flue gas containing coal dust. The integrated tower for realizing the purification of the flue gas containing the coal dust is divided into three areas from the bottom to the top, namely a slurry area, a washing area and a wet electric area; a boiling sieve is arranged in the washing area and consists of an upper layer of sieve plate and a lower layer of sieve plate; a flue gas inlet containing coal dust is arranged between the boiling sieve and the liquid level of the slurry area; the upper part of the boiling sieve is provided with a water distribution pipe network; the flue gas entering the washing zone from the flue gas inlet containing coal dust diffuses from bottom to top, meets the circulating clear liquid discharged by the water distribution pipe network from top to bottom in the fluidized bed screen, and forms gas-liquid convection in the fluidized bed screen, so that the flue gas containing coal dust is quickly washed and purified. The invention improves the purification efficiency of the flue gas containing coal dust.
Description
Technical Field
The invention belongs to the technical field of flue gas purification environment-friendly equipment, and particularly relates to an integrated tower, a device and a method for realizing purification of flue gas containing coal dust.
Background
Coal terminals or other similar working sites often generate dust in the processes of coal loading, unloading and belt transfer, and most of the dust is in an array type or intermittent type, and the instantaneous dust concentration is high (up to tens of grams per cubic meter). The traditional processing method is generally as follows: under the negative pressure of the induced draft fan, coal dust gas is collected by utilizing a gas collecting device and then enters a subsequent bag-type dust collector or an electrostatic dust collector for treatment, and is discharged through a chimney.
However, the physical properties of the flue gas containing coal dust are not considered by adopting the process method, the efficiency of treating and purifying the flue gas by adopting a bag-type dust remover or an electrostatic precipitator is low, and the problems of spontaneous combustion of the fuel on the surface of the bag, burning of the bag in autumn and winter, instantaneous exceeding of standard (black smoke generated when starting up) caused by dust explosion of coal dust and dust accumulation of an electrode plate of the electrostatic precipitator can be caused by spark discharge of the electrostatic precipitator.
In view of the foregoing, there is a need for a device and method for safely, stably and efficiently achieving deep purification of gas and recycling resources.
Disclosure of Invention
In order to solve the defects of the prior art, a first object of the invention is to provide an integrated tower for purifying flue gas containing coal dust, which can safely and stably purify the flue gas containing coal dust and can improve the purifying efficiency of the flue gas containing coal dust.
The invention relates to an integrated tower for purifying flue gas containing coal dust, which is divided into three areas from bottom to top, namely a slurry area, a washing area and a wet electric area; a boiling sieve is arranged in the washing area and consists of an upper layer of sieve plate and a lower layer of sieve plate; a flue gas inlet containing coal dust is arranged between the boiling sieve and the liquid level of the slurry area; the upper part of the boiling sieve is provided with a water distribution pipe network;
the flue gas entering the washing zone from the flue gas inlet containing coal dust diffuses from bottom to top, meets the circulating clear liquid discharged by the water distribution pipe network from top to bottom in the fluidized bed screen, and forms gas-liquid convection in the fluidized bed screen, so that the flue gas containing coal dust is quickly washed and purified.
Further, a first area and a second area with completely isolated bottoms and communicated tops are arranged in the slurry area; the first area is used for receiving coal dust-containing wastewater falling from the boiling sieve, and clear liquid formed after precipitation overflows to the second area; the bottom of the second area is provided with a liquid output pipe and is connected with a circulating pump arranged outside the integrated tower, and the circulating pump is used for conveying clear liquid to a water distribution pipe network so as to realize cyclic utilization.
The effect that it produced is: the slurry part at the bottom of the integrated tower is arranged in a partitioned way, so that clear liquid is recycled, and the overall resource consumption of the integrated tower is greatly reduced.
Further, the aperture of the lower layer sieve plate of the boiling sieve is smaller than that of the upper layer sieve plate.
The effect that it produced is: the aperture of the lower layer sieve plate of the boiling sieve is smaller than that of the upper layer sieve plate, so that a boiling liquid film can be formed between two layers, and the cleaning and purifying effects of the flue gas containing coal dust are improved.
Further, a plurality of nozzles serving as a circulating clear liquid outlet are arranged on the water distribution pipe network.
The invention is provided with the water distribution pipe network and the nozzles for distributing water for the boiling sieve instead of spray washing, and the nozzles are required to be arranged at a higher position for achieving a certain atomization effect during spray washing, so that the height of the nozzles can be reduced to a larger extent only when the water is distributed; the water distribution pipe network and the nozzles are arranged to distribute water for the boiling sieve, so that the effect of washing and purifying the flue gas containing coal dust is improved.
Further, a demister is further arranged above the water distribution pipe network.
Because the flue gas containing coal dust passes through the boiling sieve and carries a large number of liquid drops, the flue gas enters a wet electric area to be defogged, and the excessive wet electric load is avoided.
Furthermore, a wet electrostatic precipitator is arranged in the wet electric area, and a polar plate form of the wet electrostatic precipitator adopts fiber fabrics so as to meet the requirement of intermittent flushing.
A second object of the present invention is to provide a device for purifying flue gas containing coal dust, which can safely and stably purify flue gas containing coal dust and can improve the purification efficiency of flue gas containing coal dust.
The invention discloses a device for purifying flue gas containing coal dust, which comprises the integrated tower.
Further, the device for realizing the purification of the flue gas containing the coal dust further comprises a slurry pump which is used for conveying peat at the bottom of the first area of the slurry area to a coal slime filter-pressing system, and mud cakes and filtered liquid which are generated after the filter pressing of the coal slime filter-pressing system are filtered.
Further, in order to maintain water balance, a liquid supplementing pipeline is arranged, liquid in the liquid supplementing pipeline and the filtered liquid are converged, and then enter the upper part of a wet electric area of the integrated tower, are sequentially used as wet electrode plate washing water and demister washing water, and fall to a boiling sieve to be mixed with circulating clear liquid.
A third object of the present invention is to provide a purification method based on the above-mentioned device for realizing purification of flue gas containing coal dust.
The invention relates to a purifying method of a device for purifying flue gas containing coal dust, which comprises the following steps:
The flue gas entering the washing zone from the flue gas inlet containing coal dust diffuses from bottom to top, meets the circulating clear liquid discharged by the water distribution pipe network from top to bottom in the boiling sieve, and forms gas-liquid convection in the boiling sieve, so that the flue gas containing coal dust is quickly washed and purified;
The coal dust-containing flue gas after being washed by the washing area enters the wet electric area and is deeply purified, and the deeply purified gas is discharged through a direct discharge chimney;
The coal dust-containing wastewater of the boiling sieve in the washing zone falls into the slurry zone, and the clear liquid after precipitation is conveyed to a water distribution pipe network through a circulating pump, so that the recycling of the clear liquid is realized.
Compared with the prior art, the invention has the beneficial effects that:
(1) Aiming at the physical properties of coal dust particles, the invention adopts a process route of removing most of hydrophilic particles and wet electricity by water washing to further remove residual hydrophobic particles, can efficiently purify coal dust-containing gas, and has the integral dedusting efficiency of more than 99.6 percent.
(2) In the washing area of the integrated tower, the flue gas entering the washing area from the flue gas inlet containing coal dust diffuses from bottom to top, meets the liquid discharged by the water distribution pipe network from top to bottom on the boiling sieve, forms gas-liquid convection inside the boiling sieve, and realizes full, rapid and intense contact of gas and liquid by the boiling sieve, and can realize gas-solid high-efficiency separation without depending on longer contact time and travel. Meanwhile, the atomization and spraying effect of the nozzles in the water distribution process is weakened, the height of the integrated tower can be reduced to the greatest extent, and the investment is saved.
(3) After the gas containing coal dust passes through the washing area, the gas is saturated near humidity, so that the potential safety hazard of entering subsequent wet electricity is reduced to the greatest extent.
(4) The slurry at the bottom of the integrated tower is partially partitioned, clear liquid is recycled, and filter pressing liquid is completely recycled, so that the overall resource consumption of the system is greatly reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application.
FIG. 1 is a schematic diagram of an integrated tower for purifying flue gas containing coal dust;
FIG. 2 is a schematic diagram of a device for purifying flue gas containing coal dust;
FIG. 3 (a) is a schematic diagram of a sieve plate under a fluidized bed;
Fig. 3 (b) is a schematic diagram of a screen deck on a fluidized bed screen.
Wherein: 1-1 booster fan; 1-2 circulating water pumps; 1-3 stirring devices; 1-4 slurry pumps; 1-5 an integrated filter pressing system; 1-6 coal dust-containing flue gas inlets; 1-7 boiling sieve; 1-8 water distribution pipe networks; 1-9 demisters; 1-10 wet electrostatic precipitators; 1-11 chimney; 2-1 nozzles; 2-2 wet electrode plates; 3-1 upper layer screening holes; 3-2 upper layer screen plate; 4-2 lower layer sieve plates; 4-1 lower layer of sieve plate sieve holes.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Aiming at the purification of gas containing coal dust, researches show that most of particles (mass fraction, the same below) in the coal dust are hydrophilic particles, and are easy to wash and remove; the tiny particle is hydrophobic particle, insoluble in water, and difficult to wash. For hydrophilic particles, a sufficient, rapid and strong contact environment with water is created, and the high dust removal efficiency can be achieved without the need for long contact time. For hydrophobic particles, the contact with water is enhanced, the energy consumption is increased, the effect is limited, and wet electrostatic precipitation or other processes are adopted.
The flue gas scrubbing liquid may be a pre-conditioned liquid or tap water or process water from an enterprise.
In this embodiment, the flue gas washing liquid is exemplified by purified water:
As shown in fig. 1, the integrated tower for purifying the flue gas containing coal dust is divided into three areas from bottom to top, namely a slurry area, a washing area and a wet electric area.
The washing area is internally provided with a boiling sieve 1-7, and the boiling sieve 1-7 is composed of an upper layer of sieve plate and a lower layer of sieve plate; a flue gas inlet 1-6 containing coal dust is arranged between the boiling sieve 1-7 and the liquid level of the slurry area; the upper part of the boiling sieve 1-7 is provided with a water distribution pipe network 1-8;
The flue gas entering the washing zone from the flue gas inlet containing coal dust diffuses from bottom to top, meets the liquid discharged by the water distribution pipe network 1-8 and flowing from top to bottom in the fluidized bed screen, and forms gas-liquid convection in the fluidized bed screen, so that the flue gas containing coal dust is quickly washed and purified.
In a specific implementation, the vertical distance d1 (for example, 500 mm) between the lower edge of the coal dust-containing flue gas inlet 1-6 and the liquid level of the slurry area, and the vertical distance d2 (for example, 1000 mm) between the upper edge of the coal dust-containing flue gas inlet 1-6 and the bottom surface of the boiling sieve.
In the specific implementation, the boiling sieve 1-7 has a double-layer structure and is composed of an upper layer of sieve plate and a lower layer of sieve plate, as shown in fig. 3 (a) and 3 (b).
The boiling sieve 1-7 comprises a lower sieve plate 3-2 and a lower sieve plate 4-2. For example: the vertical distance d3 between the two layers of sieve plates is 15mm.
The aperture D2 of the upper layer sieve plate sieve opening 3-1 is 20mm, and the hole distance D1 is 30mm; the aperture D4 of the lower layer sieve plate sieve opening 4-1 is 18mm, and the hole distance D3 is 25mm. In order to create the best boiling effect, in the same boiling sieve, the aperture of the lower sieve plate is smaller than that of the upper sieve plate, but the aperture diameter difference is a preset value, for example: 5mm or 2mm or other value.
In the concrete implementation, the upper part of the boiling sieve 1-7 is provided with a water distribution pipe network 1-8, the water distribution pipe network 1-8 is connected with an integrated tower external circulating water pump, and a plurality of nozzles are arranged as water outlets. The purpose of the water distribution pipe network 1-8 and the nozzles 2-1 is to distribute water for the boiling sieve 1-7 instead of spray washing.
In order to reduce the overall height of the integrated tower, the vertical distance d4 between the nozzle 2-1 and the upper layer sieve plate of the boiling sieve 1-7 is 300mm.
The flue gas meets the water discharged from the nozzle 2-1 from bottom to top at the boiling sieve 1-7, and under the action of multiple factors such as static pressure, gravity, supporting force, blocking of the sieve plates on the upper layer and the lower layer, the flue gas and the water are highly turbulent in the boiling sieve (between the two layers of sieve plates) to form a violent boiling region in appearance, and the gas and the liquid are strongly convected, transferred and the dust-containing gas is efficiently and rapidly washed and purified in the region. The boiling effect is closely related to the mesh gas speed, the liquid-gas ratio of the integrated tower is improved, the gas speed and the liquid-gas ratio are both favorable for strengthening boiling, but the energy consumption of the system can be increased, and experiments show that the reasonable mesh gas speed is 3m/s, and the liquid-gas ratio is preferably 5.
After passing through the boiling sieve, the dust-containing gas carries a large amount of liquid drops, and the dust-containing gas is removed by a demister 1-9 arranged above the boiling sieve. The demister is not provided with a flushing water system alone and can be a conventional mechanical demister such as a baffle plate.
The vertical distance between the upper layer sieve plate of the boiling sieve 1-7 and the bottom surface of the demister 1-9 is d5 (for example, 800 mm).
In a specific implementation, a first area (an area) and a second area (an area B) with completely isolated bottoms and communicated tops are arranged in the slurry area.
The A area and the B area can be divided into a slurry area by an inclined plate.
The two areas A/B are completely isolated at the bottom and communicated at the upper part, namely the inclined plate is lower than the liquid level of the slurry area. The area A is used for receiving coal dust-containing wastewater falling from a boiling sieve, the wastewater is precipitated, supernatant overflows to the area B, and the bottom of the area B is provided with a water outlet pipe and is connected with a circulating pump 1-2 arranged outside the integrated tower.
In the concrete implementation, the lower part of the A area is also provided with a stirring device 1-3 for preventing the coal slime from depositing and hardening at the bottom of the slurry area, a water outlet pipe is arranged and connected with a coal slime filter pressing system 1-5 through a slurry pump 1-4, meanwhile, the lower part of the A area is provided with an instrument capable of measuring the concentration of the slurry on line in real time, when the concentration of the slurry is full of the discharge requirement, the slurry pump 1-4 is started, the liquid level of the slurry area is reduced along with the slurry, and when the liquid level of the B area is reduced to the lower limit, the slurry pump 1-4 is closed.
Wherein the stirring device 1-3 is of a conventional structure and will not be described here.
The wet electric area of the integrated tower is a wet electrostatic precipitator 1-10, and as most of wet electrode plate flushing water is sourced from clean water generated by a filter pressing system, the wet electrode plate is operated intermittently, the wet electrode plate 2-2 is preferably made of fiber fabrics so as to meet the requirement of intermittent flushing.
For example: the plate height d6 is 4m, and the section air speed is 2.5m/s. The wet electrostatic precipitator 1-10 is mainly used for treating coal dust which is not removed after passing through a boiling zone in gas, the coal dust is mostly hydrophobic particles, and the gas is discharged through a wet electric top direct discharge chimney 1-11 after further advanced treatment of the wet electrostatic precipitator.
The integrated tower of the invention has the following beneficial effects:
(a) Aiming at the physical properties of coal dust particles, the process route of water washing to remove most of hydrophilic particles and wet electricity to further remove residual hydrophobic particles is adopted, so that coal dust-containing gas can be purified efficiently, and the integral dedusting efficiency of the integrated tower can reach more than 99.6%.
(B) In the washing zone of the integrated tower, flue gas entering the washing zone from the flue gas inlet containing coal dust diffuses from bottom to top, meets liquid flowing from top to bottom and discharged from the water distribution pipe network on the boiling sieve, and forms gas-liquid convection in the boiling sieve, so that the boiling sieve realizes full, rapid and intense contact of gas and liquid, and can realize gas-solid high-efficiency separation without depending on longer contact time and travel. Meanwhile, the atomization and spraying effects of the water distribution nozzles are weakened, the height of the integrated tower can be reduced to the greatest extent, and the investment is saved.
(C) After the gas containing coal dust passes through the washing area, the gas is saturated near humidity, so that the potential safety hazard of entering subsequent wet electricity is reduced to the greatest extent.
(D) The slurry at the bottom of the integrated tower is partially partitioned, clear liquid is recycled, and filter pressing liquid is completely recycled, so that the overall resource consumption of the system is greatly reduced.
The invention discloses a device for purifying flue gas containing coal dust, which comprises an integrated tower as shown in figure 1.
As shown in fig. 2, the device for purifying the flue gas containing coal dust further comprises a slurry pump 1-4 for conveying peat at the bottom of the slurry zone to a coal slime filter-pressing system 1-5, and filtering liquid and mud cakes generated after filter pressing by the coal slime filter-pressing system 1-5.
Specifically, the water content of mud cakes generated by the coal mud filter pressing systems 1-5 is 30%, so that the coal mud filter pressing systems are convenient to transport. In order to save the occupied space, the filter pressing system is preferably an integrated plate-and-frame filter press.
In order to maintain the water balance of the system, one path of process water and clean water generated by the coal slime filter pressing system are combined and then used as make-up water of the integrated tower, a make-up water inlet is positioned above a wet electrode plate of the integrated tower, and the plate washing and demister washing are sequentially completed and then fall to a boiling sieve and are mixed with circulating clear liquid.
The device for realizing the purification of the flue gas containing coal dust has the following beneficial effects:
(1) Aiming at the physical properties of coal dust particles, the process route of water washing to remove most of hydrophilic particles and wet electricity to further remove residual hydrophobic particles is adopted, so that coal dust-containing gas can be purified efficiently, and the integral dedusting efficiency of the integrated tower can reach more than 99.6%.
(2) In the washing area of the integrated tower, the flue gas entering the washing area from the flue gas inlet containing coal dust diffuses from bottom to top, meets the liquid discharged by the water distribution pipe network from top to bottom on the boiling sieve, forms gas-liquid convection inside the boiling sieve, and realizes full, rapid and intense contact of gas and liquid by the boiling sieve, and can realize gas-solid high-efficiency separation without depending on longer contact time and travel. Meanwhile, the atomization and spraying effect of the nozzles in the water distribution process is weakened, the height of the integrated tower can be reduced to the greatest extent, and the investment is saved.
(3) After the gas containing coal dust passes through the washing area, the gas is saturated near humidity, so that the potential safety hazard of entering subsequent wet electricity is reduced to the greatest extent.
(4) The slurry at the bottom of the integrated tower is partially partitioned, clear liquid is recycled, and filter pressing liquid is completely recycled, so that the overall resource consumption of the system is greatly reduced.
The invention also provides a purifying method based on the device for purifying the flue gas containing the coal dust.
The invention relates to a purifying method of a device for purifying flue gas containing coal dust, which comprises the following steps:
The flue gas entering the washing zone from the flue gas inlet containing coal dust diffuses from bottom to top, meets the circulating clear liquid discharged by the water distribution pipe network from top to bottom in the boiling sieve, and forms gas-liquid convection in the boiling sieve, so that the flue gas containing coal dust is quickly washed and purified;
The coal dust-containing flue gas after being washed by the washing area enters the wet electric area and is deeply purified, and the deeply purified gas is discharged through a direct discharge chimney;
The coal dust-containing wastewater of the boiling sieve in the washing zone falls into the slurry zone, and the clear liquid after precipitation is conveyed to a water distribution pipe network through a circulating pump, so that the recycling of the clear liquid is realized.
Aiming at the physical properties of coal dust particles, the invention adopts a process route of removing most of hydrophilic particles and wet electricity by water washing to further remove residual hydrophobic particles, can efficiently purify coal dust-containing gas, and has the integral dedusting efficiency of more than 99.6 percent.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (6)
1. An integrated tower for realizing the purification of flue gas containing coal dust is characterized in that the integrated tower is divided into three areas from the bottom to the top, namely a slurry area, a washing area and a wet electric area; a boiling sieve is arranged in the washing area, and is of a double-layer structure and consists of an upper layer of sieve plate and a lower layer of sieve plate; a flue gas inlet containing coal dust is arranged between the boiling sieve and the liquid level of the slurry area; the upper part of the boiling sieve is provided with a water distribution pipe network;
the flue gas entering the washing zone from the flue gas inlet containing coal dust diffuses from bottom to top and meets the circulating clear liquid discharged by the water distribution pipe network from top to bottom in the fluidized bed screen, a fluidized liquid film is formed between two layers of screen plates, and gas-liquid convection is formed in the fluidized bed screen, so that the flue gas containing coal dust is quickly washed and purified;
The aperture of the lower layer sieve plate of the boiling sieve is smaller than that of the upper layer sieve plate;
The water distribution pipe network is provided with a plurality of nozzles serving as a circulating clear liquid outlet;
A first area and a second area with completely isolated bottoms and communicated tops are arranged in the slurry area; the first area is used for receiving coal dust-containing wastewater falling from the boiling sieve, and clear liquid formed after precipitation overflows to the second area; the bottom of the second area is provided with a liquid output pipe and is connected with a circulating pump arranged outside the integrated tower, and the circulating pump is used for conveying the clear liquid to a water distribution pipe network so as to realize cyclic utilization;
And a demister is further arranged above the water distribution pipe network.
2. An integrated tower for purifying flue gas containing coal dust according to claim 1, wherein a wet electrostatic precipitator is arranged in the wet electric area, and the plate form of the wet electrostatic precipitator adopts fiber fabrics.
3. An apparatus for effecting purification of flue gas containing coal dust, comprising an integrated tower as claimed in any one of claims 1-2.
4. A device for effecting a cleaning of a flue gas containing coal as recited in claim 3, further comprising a slurry pump for delivering peat from the bottom of the first section of the slurry zone to a slurry press system, a cake produced by the slurry press system and a filtered liquid.
5. The device for purifying flue gas containing coal dust according to claim 4, wherein a supplementing liquid pipeline is arranged, and liquid in the supplementing liquid pipeline is converged with the filtering liquid, enters the upper part of a wet electric area of the integrated tower, sequentially serves as wet electrode plate washing water and demister washing water, and falls to a boiling sieve to be mixed with circulating clear liquid.
6. A cleaning method based on the device for realizing the cleaning of flue gas containing coal dust according to any one of claims 3-5, characterized by comprising:
The flue gas entering the washing zone from the flue gas inlet containing coal dust diffuses from bottom to top and meets the circulating clear liquid discharged by the water distribution pipe network from top to bottom in the boiling sieve, a boiling liquid film is formed between two layers of sieve plates, and gas-liquid convection is formed inside the boiling sieve, so that the flue gas containing coal dust is quickly washed and purified;
The coal dust-containing flue gas after being washed by the washing area enters the wet electric area and is deeply purified, and the deeply purified gas is discharged through a direct discharge chimney;
The coal dust-containing wastewater of the boiling sieve in the washing zone falls into the slurry zone, and the clear liquid after precipitation is conveyed to a water distribution pipe network through a circulating pump, so that the recycling of the clear liquid is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810989247.9A CN109045906B (en) | 2018-08-28 | 2018-08-28 | Integrated tower, device and method for realizing purification of flue gas containing coal dust |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810989247.9A CN109045906B (en) | 2018-08-28 | 2018-08-28 | Integrated tower, device and method for realizing purification of flue gas containing coal dust |
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| Publication Number | Publication Date |
|---|---|
| CN109045906A CN109045906A (en) | 2018-12-21 |
| CN109045906B true CN109045906B (en) | 2024-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810989247.9A Active CN109045906B (en) | 2018-08-28 | 2018-08-28 | Integrated tower, device and method for realizing purification of flue gas containing coal dust |
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| CN (1) | CN109045906B (en) |
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| EP2113490A1 (en) * | 2008-04-28 | 2009-11-04 | Edgar Bonnaire | Method and device for mechanical separation of secondary raw materials from sludge containing iron |
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