CN108837662B - Carbon black drying furnace flue gas whitening device and process - Google Patents
Carbon black drying furnace flue gas whitening device and process Download PDFInfo
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- CN108837662B CN108837662B CN201810913766.7A CN201810913766A CN108837662B CN 108837662 B CN108837662 B CN 108837662B CN 201810913766 A CN201810913766 A CN 201810913766A CN 108837662 B CN108837662 B CN 108837662B
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 113
- 239000003546 flue gas Substances 0.000 title claims abstract description 112
- 230000002087 whitening effect Effects 0.000 title claims abstract description 59
- 239000006229 carbon black Substances 0.000 title claims abstract description 58
- 238000001035 drying Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 112
- 238000001816 cooling Methods 0.000 claims abstract description 57
- 239000000498 cooling water Substances 0.000 claims abstract description 47
- 239000007788 liquid Substances 0.000 claims abstract description 35
- 239000000945 filler Substances 0.000 claims abstract description 11
- 239000007921 spray Substances 0.000 claims description 31
- 238000003860 storage Methods 0.000 claims description 19
- 238000012856 packing Methods 0.000 claims description 11
- 238000004064 recycling Methods 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 6
- 230000001502 supplementing effect Effects 0.000 claims description 5
- 238000009833 condensation Methods 0.000 claims description 4
- 230000005494 condensation Effects 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 2
- 230000000007 visual effect Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000000779 smoke Substances 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 210000003298 dental enamel Anatomy 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000000571 coke Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention provides a flue gas whitening device and a flue gas whitening process for a carbon black drying furnace. The device comprises: a heat exchanger, a whitening tower and a cooling tower; the tower body is internally provided with a liquid holding tank, at least one circulating liquid distributor, at least one filler layer, a cooling water distributor and a demister from bottom to top in sequence; a flue gas inlet and a condensate water outlet are arranged on the lower side wall of the tower body positioned at the liquid holding tank; a flue gas outlet is arranged on the upper side wall of the tower body above the demister; the heat exchanger is communicated with the flue gas inlet; the flue gas outlet is communicated with the heat exchanger; the heat exchanger is communicated with the chimney; the heat exchanger is communicated with an external carbon black drying furnace; the condensed water outlet is communicated with the inlet of the cooling tower; the outlet of the cooling tower is communicated with the cooling water distributor. The invention can obviously eliminate the white visual pollution of the flue gas, and has better and obvious effect especially in winter; meanwhile, the collected condensed water is recycled, so that the water resource can be recycled to be 35m 3/h, the production cost is greatly reduced, and the water resource is saved.
Description
Technical Field
The invention belongs to the technical field of flue gas whitening, and particularly relates to a flue gas whitening device and a flue gas whitening process of a carbon black drying furnace.
Background
The tail gas furnace equipment matched with the carbon black drying furnace with annual production of 4 ten thousand tons/year is characterized in that fuel is carbon black tail gas or coke oven gas, the amount of waste gas after combustion of a single furnace is about 35000-450000Nm 3/h/line, the moisture content in wet-based flue gas is 40-50%, the main component of dry-based flue gas is CO 2、N2、O2, the outlet temperature of the dryer is about 160-180 ℃, dust removal is carried out through a bag-type filter to collect carbon black, and then the carbon black is emptied through a chimney.
However, the flue gas discharged through the exhaust bag filter contains about 40% -50% of water vapor, which causes waste of water resources on the one hand and forms white visual pollution on the other hand, especially strong visual pollution in winter.
Disclosure of Invention
The invention aims to solve the problems of white visual pollution, water resource waste and the like caused by smoke emission in the prior art, and provides a smoke whitening device of a carbon black drying furnace, and also aims to provide a smoke whitening process of the carbon black drying furnace; through the flue gas whitening device and the process treatment thereof, the white visual pollution of the flue gas can be obviously eliminated, and the effect is better and more obvious especially in winter; meanwhile, the condensed water collected by the device is recycled, the water resource can be recycled to be 35m 3/h, the production cost is greatly reduced, and the water resource is saved.
The aim of the invention is achieved by the following technical scheme:
In one aspect, the present invention provides a flue gas whitening apparatus for a carbon black drying furnace, the flue gas whitening apparatus for a carbon black drying furnace comprising: a heat exchanger, a whitening tower and a cooling tower;
the white tower comprises a tower body and a chimney, and the chimney is positioned above the tower body and is abutted with the tower body;
the tower body is internally provided with a liquid holding tank, at least one circulating liquid distributor, at least one filler layer, a cooling water distributor and a demister from bottom to top in sequence;
A flue gas inlet and a condensate water outlet are arranged on the lower side wall of the tower body at the liquid holding tank; a flue gas outlet is formed in the upper side wall of the tower body above the demister;
the heat exchanger is communicated with the flue gas inlet; the flue gas outlet is communicated with the heat exchanger; the heat exchanger is communicated with the chimney; the heat exchanger is communicated with an external carbon black drying furnace;
The condensed water outlet is communicated with the inlet of the cooling tower; and the outlet of the cooling tower is communicated with the cooling water distributor.
In the flue gas whitening device of the carbon black drying furnace, preferably, the demister is a flat baffle type demister; the chimney
In the above-mentioned flue gas whitening device for a carbon black drying furnace, preferably, the tower body of the whitening tower includes 2 circulating liquid distributors and 2 packing layers; the circulating liquid distributor and the packing layer are sequentially and alternately arranged in the tower body from bottom to top. The circulating liquid distributor can uniformly distribute condensed water after water sprayed by the cooling water distributor exchanges with the filler layer.
In the flue gas whitening device of the carbon black drying furnace, preferably, the filler layer is a ceramic filler layer consisting of a raschig ring and/or a pall ring. The packing layer is favorable for increasing the contact area of the flue gas and the cooling water, thereby increasing the cooling effect of the cooling water.
In the above-mentioned carbon black dry furnace flue gas whitening device, preferably, a liquid level transmitter, a flue gas temperature transmitter and a differential pressure transmitter are further arranged in the whitening tower; respectively used for monitoring the liquid level, the temperature and the pressure difference inside the white removal tower.
In the flue gas whitening device of the carbon black drying furnace, preferably, a first spray pump is arranged at the condensed water outlet; the condensed water outlet, the first spray pump and the inlet of the cooling tower are sequentially communicated.
In the flue gas whitening device of the carbon black drying furnace, preferably, a second spray pump parallel to the first spray pump is arranged at the condensed water outlet; the second spray pump is communicated with a subsequent working section device and is used for recycling condensed water as a water source of other workshops.
In the above-mentioned carbon black drying furnace flue gas whitening device, preferably, the carbon black drying furnace flue gas whitening device further includes a blower; the external carbon black drying furnace, the air increasing machine and the heat exchanger are sequentially communicated. The air increasing machine can overcome the resistance brought by the white tower to the flue gas system (the components such as the filler, the demister and the like in the white tower have certain resistance).
In the above-mentioned flue gas whitening device for a carbon black drying furnace, preferably, the heat exchanger is a GGH heat exchanger (which adopts double-sided plating industrial enamel).
In the flue gas whitening device of the carbon black drying furnace, preferably, the cooling tower is a closed cooling tower and comprises a cooling tower body, and a water storage tank, a heat exchange coil, a third spray pump and a sprayer which are arranged in the cooling tower body;
The heat exchange coil is arranged in the water storage tank, and the sprayer is arranged in the water storage tank and is positioned at the upper end of the heat exchange coil; the third spray pump is communicated with the sprayer and is used for pumping water in the water storage tank into the sprayer for spraying the heat exchange coil pipe so as to realize the circulation of water in the water storage tank;
The condensed water outlet, the heat exchange coil and the cooling water distributor are sequentially communicated.
In the above-mentioned flue gas whitening device for a carbon black drying furnace, preferably, the cooling tower further comprises at least one fan, wherein the fan is arranged at the top of the water storage tank and is positioned at the upper end of the sprayer, and is used for accelerating the flow rate of gas, taking away heat, and discharging air which passes through the heat exchange coil upwards and has a large amount of heat out of the machine body.
In the above-mentioned flue gas whitening device for a carbon black drying furnace, preferably, the number of the fans is 2.
In the above carbon black drying furnace flue gas whitening device, preferably, the cooling tower further comprises a water supplementing device, and the water supplementing device is communicated with the inside of the water storage tank. The evaporated part of spray water in the cooling tower is automatically replenished by a water replenishing valve of a water replenishing device, and the water replenishing is about 25-30m 3 per day.
On the other hand, the invention also provides a carbon black drying furnace flue gas whitening process, which is carried out by adopting the carbon black drying furnace flue gas whitening device, and comprises the following steps:
the flue gas from the carbon black drying furnace enters a heat exchanger for preliminary heat exchange and cooling, and then enters a white removal tower through a flue gas inlet;
The flue gas entering the whitening tower flows from bottom to top, cooling water is sprayed downwards from a cooling water distributor to enter a filler layer section, and the cooling water contacts with the flue gas to further cool and condense the flue gas, and condensed water in the flue gas flows into a liquid holding tank at the lower end of the whitening tower after being separated out;
The condensed flue gas continuously flows upwards, flows out from a flue gas outlet after passing through a demister, enters a heat exchanger for heat exchange and temperature rise, enters a chimney, and is discharged into the atmosphere through the chimney;
Condensed water collected by the liquid holding tank is cooled further by the cooling tower and then returns to the cooling water distributor for recycling.
In the above-mentioned carbon black dry furnace flue gas whitening process, preferably, the condensed water collected by the liquid holding tank enters into the heat exchange coil in the cooling tower, and returns to the cooling water distributor for recycling after realizing heat exchange and temperature reduction with the water sprayed by the sprayer in the cooling tower and the convection air generated by the fan.
In the flue gas whitening process of the carbon black drying furnace, preferably, the temperature of the flue gas discharged from the carbon black drying furnace is 160-180 ℃, and the water content is 40-42.23%; heat exchange is carried out through a heat exchanger, and the temperature is reduced to 120-125 ℃; the temperature of the flue gas after the flue gas enters the whitening tower and is subjected to condensation exchange with the water of the cooling water distributor is reduced to 55-60 ℃, and the water content is reduced to 16-18.7%; the flue gas is discharged from a chimney after being subjected to heat exchange by a heat exchanger and heated to 100-105 ℃;
the temperature of cooling water sprayed by the cooling water distributor in the white tower is 38-40 ℃; the temperature of the cooling water after condensation exchange with the flue gas is 50-55 ℃; cooling water is cooled to 38-40 ℃ again through a cooling tower and circulated into a cooling water distributor.
The cooling tower of the invention is a closed cooling tower, which can reduce the temperature of cooling water and maintain pure water quality, and has the following characteristics: the device has the characteristics of strong adaptability, simple structure, small volume, small occupied area, high cooling efficiency, simple connecting pipeline, small engineering quantity, convenient installation, maintenance and cleaning, water and electricity saving (low lift and large flow of a spray water pump, low power of a motor), low running cost, capability of cooling medium such as high temperature water, oil, liquid gasification and the like, safety, fire prevention and the like.
The flue gas whitening device of the carbon black drying furnace and the process thereof can obviously eliminate white visual pollution of flue gas, and particularly has better and obvious effect in winter; meanwhile, the condensed water collected by the device is recycled, the water resource can be recycled to be 35m 3/h, the production cost is greatly reduced, and the water resource is saved.
Specific embodiments of the invention are disclosed in detail below with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not limited in scope thereby. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims. Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments in combination with or instead of the features of the other embodiments.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, proportional sizes, and the like of the respective components in the drawings are merely illustrative for aiding in understanding the present invention, and are not particularly limited. Those skilled in the art with access to the teachings of the present invention can select a variety of possible shapes and scale sizes to practice the present invention as the case may be.
FIG. 1 is a schematic diagram of a flue gas whitening device of a carbon black drying furnace in an embodiment of the invention;
Description of the drawings:
1 carbon black drying furnace, 2 booster fan, 3 GGH heat exchanger, 4 white tower, 41 liquid holding tank, 42 circulating liquid distributor, 43 filler layer, 44 cooling water distributor, 45 demister, 46 chimney, 51 first spray pump, 52 second spray pump, 6 closed cooling tower, 61 water storage tank, 62 heat exchange coil, 63 third spray pump, 64 spray, 65 fan, 7 moisturizing device, 8 follow-up workshop section device.
Detailed Description
The technical solution of the present invention will be described in detail below for a clearer understanding of technical features, objects and advantageous effects of the present invention, but should not be construed as limiting the scope of the present invention. Given the teachings of the present invention, one of ordinary skill in the related art will contemplate any possible modification based on the present invention, and such should be considered to be within the scope of the present invention. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, may be in communication with each other in two elements, may be directly connected, or may be indirectly connected through an intermediary, and the specific meaning of the terms may be understood by those of ordinary skill in the art in view of the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
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. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
This implementation provides a carbon black drying furnace flue gas whitening device, as shown in fig. 1, this carbon black drying furnace flue gas whitening device includes: a GGH heat exchanger 3 (adopting double-sided plating industrial enamel), a white tower 4 and a closed cooling tower 6;
The white tower 4 comprises a tower body and a chimney 46, and the chimney 46 is positioned above the tower body and is abutted with the tower body; the inside of the tower body is provided with a liquid holding tank 41, 2 circulating liquid distributors 42 and 2 packing layers 43 in sequence from bottom to top (the circulating liquid distributors 42 and the packing layers 43 are alternately arranged in the tower body from bottom to top in sequence, preferably the packing layers 43 are ceramic packing layers consisting of Raschig rings and/or pall rings), a cooling water distributor 44 and a demister 45 (a flat baffle type demister); the lower side wall of the tower body positioned at the liquid holding tank 41 is provided with a flue gas inlet and a condensed water outlet; a flue gas outlet is arranged on the upper side wall of the tower body above the demister 45; the GGH heat exchanger 3 is communicated with the flue gas inlet; the flue gas outlet is communicated with the GGH heat exchanger 3; the GGH heat exchanger 3 is communicated with a chimney 46; the GGH heat exchanger 3 is communicated with an external carbon black drying furnace 1; the condensed water outlet is communicated with the inlet of the closed cooling tower 6; the outlet of the closed cooling tower 6 communicates with a cooling water distributor 44.
The cooling water sprayed by the cooling water distributor 44 is in direct contact with the flue gas in the filler layer 43, so that the saturated flue gas is cooled and condensed, the water content in the flue gas can be further reduced, and meanwhile, the separated condensed water can be sent to a subsequent working section device 8 for use; the cooling water can be further cooled by the closed cooling tower 6 and sent to the cooling water distributor 44 for recycling.
In a preferred embodiment, a first spray pump 51 is provided at the condensate outlet; the condensed water outlet, the first spray pump 51 and the inlet of the closed cooling tower 6 are sequentially communicated; a second spray pump 52 which is parallel to the first spray pump 51 is also arranged at the condensed water outlet; the second spray pump 52 is in communication with the subsequent station apparatus 8 for recycling condensed water as a water source for other plants (e.g., for supplementing water to flue gas desulfurization towers which may be sent to a first coking plant (about 12-15 t/h) and a second coking plant (about 30 t/h)).
In a preferred embodiment, the flue gas whitening device of the carbon black drying furnace further comprises a blower 2; the external carbon black drying furnace 1, the booster fan 2 and the GGH heat exchanger 3 are communicated in turn.
In a preferred embodiment, a liquid level transmitter, a flue gas temperature transmitter and a differential pressure transmitter are also arranged in the white tower 4; respectively used for monitoring the liquid level, the temperature and the pressure difference inside the white removal tower.
In a preferred embodiment, the closed cooling tower 6 comprises a cooling tower body and a water reservoir 61, a heat exchange coil 62, a third spray pump 63 and a sprayer 64 arranged inside the cooling tower body; the heat exchange coil 62 is arranged in the water storage tank 61, and the sprayer 64 is arranged in the water storage tank 61 and is positioned at the upper end of the heat exchange coil 62; the third spray pump 63 is communicated with the sprayer 64, and the third spray pump 63 is used for pumping water in the water storage tank 61 into the sprayer 64 to spray the water onto the heat exchange coil 62, so that the circulation of the water in the water storage tank 61 is realized; the condensate outlet, heat exchange coil 62 and cooling water distributor 44 are in communication in sequence.
The closed cooling tower 6 can reduce the temperature of cooling water and maintain the pure cooling equipment of water quality, and has the following characteristics: the device has the characteristics of strong adaptability, simple structure, small volume, small occupied area, high cooling efficiency, simple connecting pipeline, small engineering quantity, convenient installation, maintenance and cleaning, water and electricity saving (low lift and large flow of a spray water pump, low power of a motor), low running cost, capability of cooling medium such as high temperature water, oil, liquid gasification and the like, safety, fire prevention and the like.
In a preferred embodiment, the closed cooling tower 6 further comprises at least one fan 65 (preferably 2) and the fan 65 is disposed at the top of the reservoir 61 and at the upper end of the shower 64 for accelerating the flow rate of the gas, removing heat and exhausting the air with a large amount of heat across the heat exchange coil 62 upwards out of the machine body.
In a preferred embodiment, the cooling tower 6 further comprises a water replenishment device 7, the water replenishment device 7 being in communication with the interior of the reservoir 61. Part of spray water evaporated in the closed cooling tower 6 is automatically replenished by a water replenishing valve of a water replenishing device 7.
On the other hand, the embodiment also provides a carbon black drying furnace flue gas whitening process, which is performed by adopting the carbon black drying furnace flue gas whitening device shown in fig. 1, and comprises the following steps:
Collecting the flue gas from a No. 1-6 carbon black drying furnace, wherein the total flue gas amount is about 20-22 Nm 3/h, the flue gas temperature is 170 ℃, the water content is 42.23%, and the flue gas enters a GGH heat exchanger 3 to perform preliminary heat exchange and cooling to 125 ℃, and then enters a white tower 4 through a flue gas inlet;
the flue gas entering the white tower 4 flows from bottom to top, cooling water (about 40 ℃) is sprayed downwards from a cooling water distributor 44 to enter a filler layer 43 section, the cooling water contacts with the flue gas to further cool and condense the flue gas, the temperature of the flue gas is reduced to 60 ℃, the water content is reduced to 18.7%, condensed water (the amount of the condensed water is about 34.5m 3/h and the temperature is 55 ℃) in the flue gas is separated out and flows into a liquid holding tank 41 at the lower end of the white tower 4;
the condensed flue gas continuously flows upwards, flows out from a flue gas outlet after passing through a demister 45, enters a GGH heat exchanger 3 to exchange heat and raise the temperature to 105 ℃, enters a chimney 46, and is discharged into the atmosphere through the chimney 46;
The condensed water collected by the liquid holding tank 41 is further cooled to 40 ℃ by the closed cooling tower 6 and then returned to the cooling water distributor 44 for recycling.
In a preferred embodiment, the condensed water (about 55 ℃) collected by the liquid holding tank 41 enters into a heat exchange coil 61 in the closed cooling tower 6, exchanges heat with water sprayed by a sprayer 64 and convection air generated by a fan 65 in the closed cooling tower 6, cools to 40 ℃, and returns to the cooling water distributor 44 for recycling.
The smoke whitening device and the process thereof can obviously eliminate white visual pollution of smoke, and particularly have better and obvious effect in winter; meanwhile, the condensed water collected by the device is recycled, the water resource can be recycled to be 35m 3/h (shown in the table 1), the production cost is greatly reduced, and the water resource is saved.
Table 1:
Multiple elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, component, section or step is not intended to exclude other elements, components, sections or steps.
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.
Claims (8)
1. A carbon black dry furnace flue gas whitening process adopts a carbon black dry furnace flue gas whitening device to carry out the whitening process;
the flue gas whitening device of the carbon black drying furnace comprises a heat exchanger, a whitening tower, a cooling tower and a blower;
the white tower comprises a tower body and a chimney, and the chimney is positioned above the tower body and is abutted with the tower body;
The inside of the tower body is sequentially provided with a liquid holding tank, 2 circulating liquid distributors, 2 packing layers, a cooling water distributor and a demister from bottom to top; the circulating liquid distributor and the packing layer are sequentially and alternately arranged in the tower body from bottom to top;
A flue gas inlet and a condensate water outlet are arranged on the lower side wall of the tower body at the liquid holding tank; a flue gas outlet is formed in the upper side wall of the tower body above the demister;
the heat exchanger is communicated with the flue gas inlet; the flue gas outlet is communicated with the heat exchanger; the heat exchanger is communicated with the chimney; the external carbon black drying furnace, the air increasing machine and the heat exchanger are sequentially communicated;
The condensed water outlet is communicated with the inlet of the cooling tower; the outlet of the cooling tower is communicated with the cooling water distributor;
The cooling tower is a closed cooling tower and comprises a cooling tower body, and a water storage tank, a heat exchange coil, a third spray pump and a sprayer which are arranged in the cooling tower body;
The heat exchange coil is arranged in the water storage tank, and the sprayer is arranged in the water storage tank and is positioned at the upper end of the heat exchange coil; the third spray pump is communicated with the sprayer and is used for pumping water in the water storage tank into the sprayer for spraying the heat exchange coil pipe so as to realize the circulation of water in the water storage tank;
the condensed water outlet, the heat exchange coil and the cooling water distributor are sequentially communicated;
The cooling tower also comprises at least one fan, wherein the fan is arranged at the top of the water storage tank and is positioned at the upper end of the sprayer and used for accelerating the flow rate of gas and taking away heat;
The process comprises the following steps:
the flue gas from the carbon black drying furnace enters a heat exchanger for preliminary heat exchange and cooling, and then enters a white removal tower through a flue gas inlet;
The flue gas entering the whitening tower flows from bottom to top, cooling water is sprayed downwards from a cooling water distributor to enter a filler layer section, and the cooling water contacts with the flue gas to further cool and condense the flue gas, and condensed water in the flue gas flows into a liquid holding tank at the lower end of the whitening tower after being separated out;
The condensed flue gas continuously flows upwards, flows out from a flue gas outlet after passing through a demister, enters a heat exchanger for heat exchange and temperature rise, enters a chimney, and is discharged into the atmosphere through the chimney;
condensed water collected by the liquid holding tank enters a heat exchange coil in the cooling tower, exchanges heat with water sprayed by a sprayer in the cooling tower and convection air generated by a fan, and returns to the cooling water distributor for recycling after being cooled;
wherein the temperature of the flue gas from the carbon black drying furnace is 160-180 ℃, and the water content is 40-42.23%; heat exchange is carried out through a heat exchanger, and the temperature is reduced to 120-125 ℃; the temperature of the flue gas after the flue gas enters the whitening tower and is subjected to condensation exchange with the water of the cooling water distributor is reduced to 55-60 ℃, and the water content is reduced to 16-18.7%; the flue gas is discharged from a chimney after being subjected to heat exchange by a heat exchanger and heated to 100-105 ℃;
The temperature of cooling water sprayed by the cooling water distributor in the white removing tower is 38-40 ℃; the temperature of the cooling water after condensation exchange with the flue gas is 50-55 ℃; cooling water is cooled to 38-40 ℃ again through a cooling tower and circulated into a cooling water distributor.
2. The carbon black drying furnace flue gas whitening process according to claim 1, wherein: the packing layer is a ceramic packing layer formed by Raschig rings and/or pall rings.
3. The carbon black drying furnace flue gas whitening process according to claim 1, wherein: the white tower is also provided with a liquid level transmitter, a flue gas temperature transmitter and a differential pressure transmitter; respectively used for monitoring the liquid level, the temperature and the pressure difference inside the white removal tower.
4. The carbon black drying furnace flue gas whitening process according to claim 1, wherein: a first spray pump is arranged at the condensed water outlet; the condensed water outlet, the first spray pump and the inlet of the cooling tower are sequentially communicated.
5. The carbon black drying furnace flue gas whitening process according to claim 4, wherein: a second spray pump parallel to the first spray pump is arranged at the condensed water outlet; the second spray pump is communicated with a subsequent working section device and is used for recycling condensed water as a water source of other workshops.
6. The carbon black drying furnace flue gas whitening process according to claim 1, wherein: the heat exchanger is a GGH heat exchanger.
7. The carbon black drying furnace flue gas whitening process according to claim 1, wherein: the number of fans in the cooling tower is 2.
8. The carbon black drying furnace flue gas whitening process according to claim 1, wherein: the cooling tower also comprises a water supplementing device, and the water supplementing device is communicated with the inside of the water storage tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810913766.7A CN108837662B (en) | 2018-08-13 | 2018-08-13 | Carbon black drying furnace flue gas whitening device and process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810913766.7A CN108837662B (en) | 2018-08-13 | 2018-08-13 | Carbon black drying furnace flue gas whitening device and process |
Publications (2)
| Publication Number | Publication Date |
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| CN108837662A CN108837662A (en) | 2018-11-20 |
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| CN109260914B (en) * | 2018-11-30 | 2024-01-30 | 山东华创节能环保科技有限公司 | Flue gas whitening system and process utilizing air circulation |
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| CN110093465B (en) * | 2019-04-16 | 2021-06-08 | 浙江菲达环保科技股份有限公司 | Blast furnace slag flushing steam whitening system and method |
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