CN113648805A - Double-area double-circulation flue gas carbon dioxide absorption tower and process - Google Patents

Double-area double-circulation flue gas carbon dioxide absorption tower and process Download PDF

Info

Publication number
CN113648805A
CN113648805A CN202111086748.4A CN202111086748A CN113648805A CN 113648805 A CN113648805 A CN 113648805A CN 202111086748 A CN202111086748 A CN 202111086748A CN 113648805 A CN113648805 A CN 113648805A
Authority
CN
China
Prior art keywords
absorption
layer
tower
flue gas
liquid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111086748.4A
Other languages
Chinese (zh)
Inventor
祁志福
申震
厉宸希
刘飞
高强生
翁建明
王亮
杨睿
刘羽
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Energy Group Research Institute Co Ltd
Original Assignee
Zhejiang Energy Group Research Institute Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhejiang Energy Group Research Institute Co Ltd filed Critical Zhejiang Energy Group Research Institute Co Ltd
Priority to CN202111086748.4A priority Critical patent/CN113648805A/en
Publication of CN113648805A publication Critical patent/CN113648805A/en
Pending legal-status Critical Current

Links

Images

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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/62—Carbon oxides
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/75—Multi-step processes
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/96—Regeneration, reactivation or recycling of reactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/30—Alkali metal compounds
    • B01D2251/304—Alkali metal compounds of sodium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/60—Inorganic bases or salts
    • B01D2251/604—Hydroxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/504—Carbon dioxide
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention relates to a double-region double-circulation flue gas carbon dioxide absorption tower which comprises an absorption tower main body, a lower absorption packing layer, an upper absorption packing layer, a lower layer spray device, an upper layer spray device, an absorption tower demister, a tower kettle I, a tower kettle II and an absorption liquid preparation box, wherein the absorption tower main body is provided with a first absorption layer and a second absorption layer; the absorption tower main body is divided into an upper absorption tower and a lower absorption tower; a lower absorption packing layer is arranged in the lower absorption tower, and a lower layer spraying device is arranged above the lower absorption packing layer; an upper absorption packing layer is arranged in the upper absorption tower, and an upper spraying device is arranged above the upper absorption packing layer. The invention has the beneficial effects that: according to the invention, the height of the absorption tower can be reduced on the premise of ensuring the capture rate of the carbon dioxide at the lower layer by improving the liquid-gas ratio of the absorption tower at the lower layer, the absorption reaction strength is increased by improving the concentration of the absorbent in the absorption tower at the upper layer, the height of the absorption tower is effectively reduced on the premise of ensuring the capture rate of the carbon dioxide at the upper layer, and finally, the height of the absorption tower is effectively reduced while the higher capture rate of the carbon dioxide in the whole tower is realized.

Description

Double-area double-circulation flue gas carbon dioxide absorption tower and process
Technical Field
The invention relates to the field of carbon dioxide capture and absorption tower design and environmental protection, in particular to a double-zone double-circulation flue gas carbon dioxide absorption tower and a process.
Background
In 2019, the carbon emission of coal-fired power plants in the electric power industry of China accounts for about 65% of the total carbon emission of China, the coal-fired power plants are the industries with the largest carbon emission, the development condition of the thermal power industry of China is comprehensively considered, and the carbon capture is mainly realized by modifying the capture technology after combustion of thermal power generating units in stock before 2035 years. In the existing carbon capture technology, a chemical absorption method is the most promising capture technology, a single-zone single-pass packing absorption tower is used as an absorption reactor, organic amines, inorganic strong base and the like are used as chemical absorbents to perform absorption reaction with flue gas in the absorption tower, the absorbents are not circulated after passing through the absorption tower and are directly conveyed to a regeneration system, the absorption process needs enough tower height to ensure absorption efficiency, the absorption tower is increased in multiples when the absorption scale is increased, the increase of the tower height not only greatly increases the equipment investment cost, but also brings great challenges to wind resistance and earthquake resistance of the equipment.
In order to meet the requirement of the capture efficiency of the carbon dioxide in the flue gas and simultaneously reduce the height of the absorption tower to the maximum extent, the design of the absorption tower usually adopts the scheme that a plurality of towers are connected in series or a plurality of small systems replace a large system, and the schemes not only reduce the investment cost of equipment and limit but also increase the occupied area of the equipment. At present, the design of a carbon dioxide absorption tower which can meet the requirement of high-efficiency absorption and can effectively reduce the height of the tower is not reported, so that the double-area double-circulation flue gas carbon dioxide absorption tower and the process have important significance.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a double-area double-circulation flue gas carbon dioxide absorption tower and a process.
The double-region double-circulation flue gas carbon dioxide absorption tower comprises an absorption tower main body, a lower absorption packing layer, an upper absorption packing layer, a lower layer spray device, an upper layer spray device, an absorption tower demister, a tower kettle I, a tower kettle II and an absorption liquid preparation box; the absorption tower main body is divided into an upper absorption tower and a lower absorption tower; a lower absorption packing layer is arranged in the lower absorption tower, and a lower layer spraying device is arranged above the lower absorption packing layer; an upper absorption packing layer is arranged in the upper absorption tower, an upper spraying device is arranged above the upper absorption packing layer, and an upper absorption liquid collector is arranged below the upper absorption packing layer; an absorption tower demister is arranged above the upper spraying device; the bottom of the absorption tower is provided with an original flue gas distributor; a raw flue gas inlet flow regulating valve and a raw flue gas flowmeter are arranged at an inlet at the bottom of the absorption tower; a clean flue gas discharge valve is arranged at an outlet at the top of the absorption tower; a first tower kettle and a second tower kettle are sequentially arranged below the absorption tower; the first tower kettle is connected to the lower spraying device through a lower liquid supply pump, a lower liquid supply pump flow regulating valve and a lower absorption liquid flow meter in sequence; the tower kettle II is connected to the upper spraying device through an upper liquid supply pump, an upper liquid supply pump flow regulating valve and an upper absorption liquid flow meter in sequence; the upper layer absorption liquid collector is respectively connected to the first tower kettle and the second tower kettle through an upper layer absorption liquid return tower kettle first valve and an upper layer absorption liquid return tower kettle second valve; a liquid outlet of the tower kettle I is sequentially connected to an absorption liquid discharge pump and an absorption liquid discharge valve; the absorption liquid preparation box is connected to the inlet of the tower kettle II through an absorption liquid supplement pump and an absorption liquid supplement valve in sequence; the first tower kettle and the second tower kettle are respectively provided with a first tower kettle liquid level sensor and a second tower kettle liquid level sensor.
Preferably, the method comprises the following steps: the lower part of the upper absorption packing layer is provided with an upper-layer packing wall-flow-preventing ring.
Preferably, the method comprises the following steps: an inlet of the absorption liquid preparation box is provided with an inlet valve of the absorption liquid preparation box.
Preferably, the method comprises the following steps: an upper absorption liquid outlet thermometer is arranged at the outlet of the upper absorption liquid collector; the absorption tower flue gas inlet pipeline is provided with a raw flue gas analyzer, a raw flue gas temperature sensor and a raw flue gas pressure sensor; a lower-layer absorption liquid temperature sensor is arranged on a pipeline from the first tower kettle to the lower-layer spraying device; an upper layer absorption liquid temperature sensor is arranged on a pipeline from the second tower kettle to the upper layer spraying device; an interlayer flue gas analyzer, an interlayer flue gas temperature sensor and an interlayer flue gas pressure sensor are arranged between the lower absorption packing layer and the upper absorption packing layer; a clean flue gas analyzer, a clean flue gas temperature sensor and a clean flue gas pressure sensor are arranged on the absorption tower smoke exhaust pipeline; and a liquid discharge pipeline of the tower kettle is provided with an absorption liquid discharge liquid temperature sensor.
The process of the double-area double-circulation flue gas carbon dioxide absorption tower comprises the following steps:
s1, absorbent solution with a certain concentration is prepared in the absorption solution preparation box, an absorption solution replenishing valve and an absorption solution replenishing pump are opened, fresh absorption solution is conveyed to a second tower kettle, the absorption solution replenishing valve and the absorption solution replenishing pump are closed, an upper-layer liquid supply pump flow regulating valve and an upper-layer absorption solution return first tower kettle valve are opened, an upper-layer absorption solution return second tower kettle valve is closed, an upper-layer liquid supply pump is opened, the absorption solution is conveyed to the first tower kettle, and the upper-layer liquid supply pump is closed;
s2, opening an upper-layer liquid supply pump, spraying absorption liquid to an upper absorption filler layer through an upper-layer spraying device of an upper-layer absorption tower, closing a first valve of an upper-layer absorption liquid return tower kettle, opening a second valve of the upper-layer absorption liquid return tower kettle, opening an upper-layer absorption liquid flow meter, associating the upper-layer absorption liquid flow meter with the upper-layer liquid supply pump for processing, and adjusting the flow rate of the absorption liquid to a set value;
s3, opening a flow regulating valve of a lower-layer liquid supply pump, opening the lower-layer liquid supply pump, spraying absorption liquid to a lower absorption packing layer through a lower-layer spraying device of a lower-layer absorption tower, returning the absorption liquid to a tower I, opening a lower-layer absorption liquid flowmeter, associating the lower-layer absorption liquid flowmeter with the lower-layer liquid supply pump for treatment, and adjusting the flow of the absorption liquid to a set value;
s4, opening a raw flue gas inlet flow regulating valve and a clean flue gas discharge valve, opening a raw flue gas flowmeter, regulating the flow to a set flow according to a raw flue gas temperature sensor and a raw flue gas pressure sensor, uniformly dispersing the raw flue gas to the bottom of an absorption tower through a raw flue gas distributor, sequentially passing through a lower absorption packing layer, an upper absorption packing layer and an absorption tower demister, and discharging the raw flue gas from the top of the tower, wherein the carbon dioxide capture rate is calculated by data collected by a raw flue gas analyzer, an interlayer flue gas analyzer and a clean flue gas analyzer;
s5, monitoring the carbon dioxide capture rate of the lower absorption tower and the upper absorption tower respectively during operation, adjusting the flow regulating valve of the lower liquid supply pump, controlling the carbon dioxide capture rate of the lower absorption tower to be not less than 60%, adjusting the flow regulating valve of the upper liquid supply pump, controlling the carbon dioxide capture rate of the upper absorption tower to be not less than 50%, and enabling the carbon dioxide capture rate of the whole tower to be not less than 80%;
s6, monitoring the concentration of the absorption liquid in the first tower kettle, opening an absorption liquid discharge valve and an absorption liquid discharge pump when the concentration is lower than a set value, conveying the absorption liquid to a subsequent regeneration system, determining the discharge amount of the absorption liquid according to a liquid level sensor of the first tower kettle, closing the absorption liquid discharge valve and the absorption liquid discharge pump when the discharge amount reaches the set value, opening a valve of the first tower kettle for feeding the upper layer of absorption liquid, feeding the absorption liquid in the first tower kettle to the set value according to the feedback value of the liquid level sensor of the first tower kettle, closing the valve of the first tower kettle for feeding the upper layer of absorption liquid after the feeding is finished, opening an absorption liquid feeding valve and an absorption liquid feeding pump, and feeding the absorption liquid in the second tower kettle to the set value according to the feedback value of the liquid level sensor of the first tower kettle;
s7, when the equipment is stopped, closing the raw flue gas inlet flow regulating valve and the clean flue gas discharge valve in sequence, closing the flue gas system, closing the lower liquid supply pump and the lower liquid supply pump flow regulating valve in sequence, closing the lower absorption cycle, closing the upper liquid supply pump and the upper liquid supply pump flow regulating valve in sequence, when the upper absorption tower does not have the absorption liquid to flow back, closing the upper absorption liquid return valve to the tower kettle, closing the upper absorption cycle, closing each flue gas analyzer and sensor in sequence, and stopping the equipment.
Preferably, the method comprises the following steps: step S1 the absorption liquid preparation box uses stainless steel or engineeringAlkali-resistant material such as plastic with a volume of 1-10m3Within the range; the absorption liquid is organic amine absorbent, sodium hydroxide or potassium hydroxide and the like; the stirrer of the absorption liquid preparation box is provided with 2-3 stirring blades and 1-3 stirring layers, and the rotating speed is within the range of 100-400 rpm; the absorption liquid replenishing pump is alkali-resistant and has a flow rate of 2-5m3Within the range of/h, the precision is not lower than 1%.
Preferably, the method comprises the following steps: step S1, the second tower kettle is made of stainless steel material, the section is square or round, the height is within the range of 0.3-1m, and the volume is 1-3m3Within the range; a liquid level sensor is arranged in the second tower kettle, the measuring range of the liquid level sensor is 0.3-1m, and the precision is not lower than 0.05 m; the upper layer liquid supply pump is alkali-resistant, and the flow rate is 0.5-10m3Within the range of/h, the precision is not lower than 1%, and the outlet flow is regulated according to the feedback of the upper-layer absorption liquid flowmeter.
Preferably, the method comprises the following steps: step S2, the upper absorption tower is made of stainless steel, the inner diameter is not less than 100mm, and the effective filler height is not less than 1 m; the upper absorption packing layer uses regular packing made of alkali-resistant materials including stainless steel, plastics or ceramics, and has a specific surface area of 50-800m2/m3The inclination angle of the packing is within the range of 30-60 degrees, the thickness of a packing plate sheet (the packing is made of stainless steel plates) is within the range of 0.1-0.2mm, the height of a packing disc (the regular packing is spliced into a whole, each block is called as a packing disc) is within the range of 40-200mm, and the packing is provided with a wall flow prevention device.
Preferably, the method comprises the following steps: s2, the upper layer spray device uses stainless steel or alkali-proof plastic, the density of the spray points is determined according to the specific surface area of the filler, when the specific surface area of the filler is not more than 600m2/m3When the density of the spraying points is not less than 250/m2When the specific surface area of the filler is more than 600m2/m3When the density of the spraying points is not less than 300/m2。
Preferably, the method comprises the following steps: step S3, the lower absorption tower is made of stainless steel, the inner diameter is not less than 100mm, and the effective filler height is not less than 1 m; the lower absorption packing layer uses regular packing made of alkali-resistant materials including stainless steel, plastics or ceramics, and has a specific surface area of 50-800m2/m3The inclination angle of the packing is within the range of 30-60 degrees, the thickness of a packing plate sheet (the packing is made of stainless steel plates) is within the range of 0.1-0.2mm, the height of a packing disc (the regular packing is spliced into a whole, each block is called as a packing disc) is within the range of 40-200mm, and the packing is provided with a wall flow prevention device.
Preferably, the method comprises the following steps: s3, the lower layer spray device uses stainless steel or alkali-proof plastic, the density of the spray point is determined according to the specific surface area of the filler, when the specific surface area of the filler is not more than 600m2/m3When the density of the spraying points is not less than 250/m2When the specific surface area of the filler is more than 600m2/m3When the density of the spraying points is not less than 300/m2。
Preferably, the method comprises the following steps: step S3, the first tower kettle is made of stainless steel material, the section is square or round, the height is within the range of 0.3-1m, and the volume is 1-3m3Within the range; a liquid level sensor is arranged in the first tower kettle, the measuring range of the liquid level sensor is 0.3-1m, and the precision is not lower than 0.05 m; the lower layer liquid supply pump is alkali-resistant, and the flow rate is 0.5-10m3Within the range of/h, the precision is not lower than 1%, the outlet flow is regulated according to the feedback of the lower-layer absorption liquid flowmeter, and the regulation precision is not lower than 1%.
Preferably, the method comprises the following steps: s4, the original flue gas inlet flow regulating valve is subjected to feedback regulation according to data collected by an original flue gas flowmeter, and the regulation precision is not lower than 1%; the raw flue gas distributor is made of alkali-resistant materials such as stainless steel, plastics or ceramics, and the gas outlet direction is downward and is not lower than the liquid level of the tower kettle.
Preferably, the method comprises the following steps: step S4 shows that the original flue gas analyzer has a carbon dioxide test range of 5-25% and an accuracy of not less than 0.5%, the interlayer flue gas analyzer has a carbon dioxide test range of 1-10% and an accuracy of not less than 0.5%, and the clean flue gas analyzer has a carbon dioxide test range of 0.01-5% and an accuracy of not less than 0.5%.
Preferably, the method comprises the following steps: the absorbing liquid discharge pump of step S6 should be alkali-resistant, and the flow rate should be 0.5-10m3Within the range of/h, the precision is not lower than 1 percent; the concentration of the absorption liquid can be measured by an on-line concentration meter or by manual sampling.
Preferably, the method comprises the following steps: the process of discharging and replenishing the absorption liquid in the step S6 is automatically controlled by a control system, and the control system has a liquid level automatic alarm function and an emergency pump stop function.
The invention has the beneficial effects that:
1. the dual-zone dual-circulation flue gas and carbon dioxide absorption tower adopts flue gas at the outlet of a desulfurization absorption tower of a thermal power plant as raw flue gas, realizes gas flow control through a raw flue gas flow meter and a raw flue gas inlet flow regulating valve, adopts an upper dual-zone dual-circulation absorption tower and a lower dual-zone dual-circulation absorption tower as carbon dioxide traps, adopts a lower absorption tower as a main carbon dioxide trapping zone, has a trapping rate of not less than 60 percent, adopts an upper absorption tower as an auxiliary trapping zone, has a trapping rate of not less than 50 percent, ensures that the integral trapping rate of the absorption tower is not less than 80 percent, and realizes green and clean emission of the flue gas.
2. According to the invention, the height of the absorption tower can be reduced on the premise of ensuring the capture rate of the carbon dioxide at the lower layer by improving the liquid-gas ratio of the absorption tower at the lower layer, the absorption reaction strength is increased by improving the concentration of the absorbent in the absorption tower at the upper layer, the height of the absorption tower is effectively reduced on the premise of ensuring the capture rate of the carbon dioxide at the upper layer, and finally, the height of the absorption tower is effectively reduced while the higher capture rate of the carbon dioxide in the whole tower is realized.
3. The invention replaces single-pass absorption by circulating absorption, and the absorbent is regenerated when the conversion rate of the absorbent (the ratio of sodium hydroxide to sodium carbonate) is high, so that the circulating absorption capacity of the absorbent carbon dioxide is improved, and the energy consumption of the regeneration link can be effectively reduced.
4. The invention adopts a multi-point data acquisition and feedback control mode to realize automatic control and safe operation in the operation process.
Drawings
FIG. 1 is a schematic diagram of a two-zone dual cycle flue gas carbon dioxide absorber.
Description of reference numerals: a raw flue gas inlet flow regulating valve 1, a raw flue gas distributor 2, a lower absorption packing layer 3, an upper absorption packing layer 4, a lower layer spray device 5, an upper layer spray device 6, an absorption tower demister 7, an upper layer absorption liquid collector 8, an upper layer packing wall-flow prevention ring 9, a first tower kettle 10, a second tower kettle 11, a lower layer liquid supply pump 12, an upper layer liquid supply pump 13, an upper layer liquid supply pump flow regulating valve 14, an upper layer absorption liquid return tower kettle second valve 15, an upper layer absorption liquid flowmeter 16, an upper layer absorption liquid return tower kettle first valve 17, a lower layer liquid supply pump flow regulating valve 18, a lower layer absorption liquid flowmeter 19, a purified flue gas discharge valve 20, an absorption liquid discharge pump 21, an absorption liquid discharge valve 22, an absorption liquid replenishing valve 23, an absorption liquid replenishing pump 24, an absorption liquid preparation box 25, an absorption liquid preparation box incoming water valve 26, a tower kettle two liquid level sensor 27, a first tower kettle liquid level sensor 28, an upper layer absorption liquid thermometer 29, A raw flue gas temperature sensor 31, a raw flue gas pressure sensor 32, a lower absorption liquid temperature sensor 33, an upper absorption liquid temperature sensor 34, an interlayer flue gas analyzer 35, an interlayer flue gas temperature sensor 36, an interlayer flue gas pressure sensor 37, a clean flue gas analyzer 38, a clean flue gas temperature sensor 39, a clean flue gas pressure sensor 40, an absorption liquid discharge liquid temperature sensor 41, and a raw flue gas flow meter 42.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The double-area double-circulation flue gas carbon dioxide absorption tower and the process can realize high-efficiency absorption of flue gas carbon dioxide in a power plant, highly effective reduction of the absorption tower and increase of the cyclic absorption capacity of an absorbent. The principle of the carbon dioxide high-efficiency absorption is as follows: the lower absorption tower is used as a main carbon dioxide capture area, the flow of absorption liquid is large, the capture rate under high carbon dioxide concentration is not lower than 60%, the upper absorption tower is used as an auxiliary capture area, the concentration of the absorption liquid is high, the capture rate under low carbon dioxide concentration is not lower than 50%, and the whole capture rate of the absorption tower is not lower than 80%; the principle of the height of the absorption tower is as follows: the height of the absorption tower can be reduced on the premise of ensuring the capture rate of the carbon dioxide at the lower layer by improving the liquid-gas ratio of the absorption tower at the lower layer, the absorption reaction strength is increased by improving the concentration of an absorbent in the absorption tower at the upper layer, the height of the absorption tower is effectively reduced on the premise of ensuring the capture rate of the carbon dioxide at the upper layer, and finally the height of the absorption tower is effectively reduced while the higher capture rate of the carbon dioxide in the whole tower is realized; the principle of increasing the cyclic absorption capacity of the absorbent is as follows: by replacing single-pass absorption with cyclic absorption, the absorbent is regenerated when the conversion rate of the absorbent (the ratio of sodium hydroxide to sodium carbonate) is high, so that the cyclic absorption capacity of the absorbent carbon dioxide is improved, and the energy consumption of the regeneration link can be effectively reduced.
Example one
The embodiment of the application provides a double-zone double-circulation flue gas carbon dioxide absorption tower, which comprises a raw flue gas inlet flow regulating valve 1, a raw flue gas distributor 2, a lower absorption packing layer 3, an upper absorption packing layer 4, a lower layer spray device 5, an upper layer spray device 6, an absorption tower demister 7, an upper layer absorption liquid collector 8, an upper layer packing wall-flow prevention ring 9, a tower kettle I10, a tower kettle II 11, a lower layer liquid supply pump 12, an upper layer liquid supply pump 13, an upper layer liquid supply pump flow regulating valve 14, an upper layer absorption liquid return tower kettle II valve 15, an upper layer absorption liquid flowmeter 16, an upper layer absorption liquid return tower kettle I valve 17, a lower layer liquid supply pump flow regulating valve 18, a lower layer absorption liquid flowmeter 19, a purified flue gas discharge valve 20, an absorption liquid discharge pump 21, an absorption liquid discharge valve 22, an absorption liquid supplement valve 23, an absorption liquid supplement pump 24, an absorption liquid preparation box 25, an absorption liquid preparation box water inlet valve 26, A tower bottom liquid level sensor 27, a tower bottom liquid level sensor 28, an upper layer absorption liquid outlet thermometer 29, a raw flue gas analyzer 30, a raw flue gas temperature sensor 31, a raw flue gas pressure sensor 32, a lower layer absorption liquid temperature sensor 33, an upper layer absorption liquid temperature sensor 34, an interlayer flue gas analyzer 35, an interlayer flue gas temperature sensor 36, an interlayer flue gas pressure sensor 37, a clean flue gas analyzer 38, a clean flue gas temperature sensor 39, a clean flue gas pressure sensor 40, an absorption liquid outlet liquid temperature sensor 41 and a raw flue gas flowmeter 42.
The absorption tower main body is divided into an upper absorption tower and a lower absorption tower; a lower absorption packing layer 3 is arranged in the lower absorption tower, and a lower spraying device 5 is arranged above the lower absorption packing layer 3; an upper absorption packing layer 4 is arranged in the upper absorption tower, an upper spraying device 6 is arranged above the upper absorption packing layer 4, and an upper absorption liquid collector 8 is arranged below the upper absorption packing layer 4; an absorption tower demister 7 is arranged above the upper spraying device 6; the bottom of the absorption tower is provided with an original flue gas distributor 2; the bottom inlet of the absorption tower is provided with a raw flue gas inlet flow regulating valve 1 and a raw flue gas flowmeter 42; a clean flue gas discharge valve 20 is arranged at the outlet of the top of the absorption tower; a first tower kettle 10 and a second tower kettle 11 are sequentially arranged below the absorption tower; the tower kettle I10 is connected to the lower-layer spraying device 5 through a lower-layer liquid supply pump 12, a lower-layer liquid supply pump flow regulating valve 18 and a lower-layer absorption liquid flowmeter 19 in sequence; the second tower bottom 11 is connected to the upper spraying device 6 through an upper liquid supply pump 13, an upper liquid supply pump flow regulating valve 14 and an upper absorption liquid flowmeter 16 in sequence; the upper layer absorption liquid collector 8 is respectively connected to the first tower kettle 10 and the second tower kettle 11 through an upper layer absorption liquid return tower kettle first valve 17 and an upper layer absorption liquid return tower kettle second valve 15; a liquid outlet of the first tower kettle 10 is sequentially connected to an absorption liquid discharge pump 21 and an absorption liquid discharge valve 22; the absorption liquid preparation box 25 is connected to the inlet of the second tower kettle 11 through an absorption liquid supplement pump 24 and an absorption liquid supplement valve 23 in sequence; the first tower kettle 10 and the second tower kettle 11 are respectively provided with a second tower kettle liquid level sensor 27 and a first tower kettle liquid level sensor 28.
The lower part of the upper absorption packing layer 4 is provided with an upper-layer packing wall-flow-proof ring 9.
An inlet of the absorption liquid preparation box 2 is provided with an absorption liquid preparation box water inlet valve 26.
An upper layer absorption liquid outlet thermometer 29 is arranged at the outlet of the upper layer absorption liquid collector 8.
The absorption tower flue gas inlet pipeline is provided with a raw flue gas analyzer 30, a raw flue gas temperature sensor 31 and a raw flue gas pressure sensor 32.
And a lower-layer absorption liquid temperature sensor 33 is arranged on a pipeline from the first tower kettle 10 to the lower-layer spraying device 5.
An upper layer absorption liquid temperature sensor 34 is arranged on a pipeline from the second tower kettle 11 to the upper layer spraying device 6.
An interlayer flue gas analyzer 35, an interlayer flue gas temperature sensor 36 and an interlayer flue gas pressure sensor 37 are arranged between the lower absorption filler layer 3 and the upper absorption filler layer 4.
The absorption tower smoke discharge pipeline is provided with a clean smoke gas analyzer 38, a clean smoke gas temperature sensor 39 and a clean smoke gas pressure sensor 40.
And the liquid discharge pipeline of the first tower 10 is provided with an absorption liquid discharge liquid temperature sensor 41.
Example two
The second embodiment of the application provides a process for a double-zone double-circulation flue gas carbon dioxide absorption tower, wherein flue gas is introduced into the absorption tower through a raw flue gas inlet flow regulating valve 1 and a raw flue gas distributor 2, and is discharged out of the absorption tower after sequentially passing through a lower absorption packing layer 3, an upper absorption packing layer 4 and an absorption tower demister 7; absorbing liquid is prepared in an absorbing liquid preparation box 25 and then is pumped into a second tower kettle 11 through an absorbing liquid supplement pump 24, absorbing liquid in the second tower kettle 11 is conveyed to an upper-layer absorbing tower through an upper-layer liquid supply pump 13 and is uniformly sprayed on an upper absorbing filler layer 4 through an upper-layer spraying device 6, the absorbing liquid flows back to the second tower kettle 11 or the first tower kettle 10 from an upper-layer absorbing liquid collector 8 after reaction is finished, absorbing liquid in the first tower kettle 10 is conveyed to a lower-layer absorbing tower through a lower-layer liquid supply pump 12 and is uniformly sprayed on a lower absorbing filler layer 3 through a lower-layer spraying device 5 and returns to the first tower kettle 10 along the absorbing tower, and the purposes of large absorbing capacity of the lower-layer absorbing tower and strong absorbing capacity of the upper-layer absorbing tower are achieved by controlling the concentration of absorbing agent in the first tower kettle 10 and the second tower kettle 11 and the spraying flow of the absorbing agent. The method specifically comprises the following steps:
s1, absorbent solution with a certain concentration is prepared in the absorbent preparation box 25, the absorbent supplement valve 23 and the absorbent supplement pump 24 are opened, fresh absorbent is conveyed to the second tower bottom 11, the absorbent supplement valve 23 and the absorbent supplement pump 24 are closed, the upper-layer liquid supply pump flow regulating valve 14 and the upper-layer absorbent return first tower bottom valve 17 are opened, the upper-layer absorbent return second tower bottom valve 15 is closed, the upper-layer liquid supply pump 13 is opened, the absorbent is conveyed to the first tower bottom 10, and the upper-layer liquid supply pump 13 is closed;
wherein the absorption liquid preparation tank is made of stainless steel and has a volume of 4m3In the range, the absorption liquid should be sodium hydroxide, the stirrer is provided with 3 stirring blades and 2 stirring layers, the rotating speed is 300rpm, the absorption liquid supplementing pump is alkali-resistant, and the flow is 4m3H, precision 0.5%. The second tower kettle is made of stainless steel, the cross section of the second tower kettle is circular, the height of the second tower kettle is 0.8m, and the volume of the second tower kettle is 1m3A liquid level sensor is arranged in the tower kettle, the measuring range of the sensor is 1m, the precision is 0.03m, the upper layer supplies liquidThe pump is alkali-resistant and has a flow rate of 1.5m3The accuracy is 0.5%, and the outlet flow is regulated according to the feedback of the upper-layer absorption liquid flowmeter.
S2, opening an upper liquid supply pump 13, spraying absorption liquid to an upper absorption packing layer 4 through an upper spraying device 6 of an upper absorption tower, closing a first valve 17 of an upper absorption liquid return tower kettle, opening a second valve 15 of the upper absorption liquid return tower kettle, opening an upper absorption liquid flow meter 16, associating the upper absorption liquid flow meter with the upper liquid supply pump 13 for treatment, and adjusting the flow of the absorption liquid to a set value;
wherein the upper absorption tower is made of stainless steel, the inner diameter is 300mm, the effective packing height is 5m, the upper absorption packing layer is made of regular packing and is made of stainless steel, and the specific surface area of the packing is 750m2/m3The filler inclination angle is 45 degrees, the thickness of a filler plate sheet (the filler is made of stainless steel plates) is 0.1mm, the height of a filler disc (regular fillers are spliced into a whole, each filler disc is called as a filler disc) is 100mm, and the filler is provided with a wall flow preventing device. The upper layer of spraying device uses stainless steel, and the density of spraying points is 300/m2。
S3, opening a flow regulating valve 18 of a lower liquid supply pump, opening a lower liquid supply pump 12, spraying absorption liquid to a lower absorption packing layer 3 through a lower spraying device 5, returning the absorption liquid to the tower I10, opening a lower absorption liquid flowmeter 19, associating the lower absorption liquid flowmeter with the lower liquid supply pump 12 for treatment, and regulating the flow of the absorption liquid to a set value;
wherein the absorption tower is made of stainless steel, the inner diameter is 300mm, the effective packing height is 5m, the lower absorption packing layer is made of regular packing, the material is stainless steel, and the specific surface area of the packing is 750m2/m3The filler inclination angle is 45 degrees, the thickness of a filler plate sheet (the filler is made of stainless steel plates) is 0.1mm, the height of a filler disc (regular fillers are spliced into a whole, each filler disc is called as a filler disc) is 100mm, and the filler is provided with a wall flow preventing device. The lower layer spraying device uses stainless steel, and the density of spraying points is 300/m2. The tower kettle should be made of stainless steel material, with square or round cross section, height of 0.3-1m, and volume of 1-3m3In the range, a liquid level sensor is arranged in the tower kettle, the measuring range of the sensor is 0.3-1m, the precision is not lower than 0.05m, and a lower-layer liquid supply pump is resistant to the liquid level sensorAlkali with flow rate of 0.5-10m3Within the range of/h, the precision is not lower than 1%, the outlet flow is regulated according to the feedback of the upper-layer absorption liquid flowmeter, and the regulation precision is not lower than 1%.
S4, opening a raw flue gas inlet flow regulating valve 1 and a clean flue gas discharge valve 20, opening a raw flue gas flowmeter 42, regulating the flow to a set flow according to a raw flue gas temperature sensor 31 and a raw flue gas pressure sensor 32, uniformly dispersing raw flue gas to the bottom of an absorption tower through a raw flue gas distributor 2, sequentially passing through a lower absorption packing layer 3, an upper absorption packing layer 4 and an absorption tower demister 7, and discharging the raw flue gas from the top of the tower, wherein the carbon dioxide trapping rate is calculated by data collected by a raw flue gas analyzer 30, an interlayer flue gas analyzer 35 and a clean flue gas analyzer 38;
wherein the flow regulating valve of the original flue gas inlet is fed back and regulated according to the data collected by the original flue gas flowmeter, the regulating precision is 0.5 percent, the distributor is made of stainless steel, the gas outlet is downward, and the position is not lower than the first liquid level of the tower kettle. The carbon dioxide test range of the original flue gas analyzer is 5-25%, the precision is 0.5%, the carbon dioxide test range of the interlayer flue gas analyzer is 1-10%, the precision is 0.5%, the carbon dioxide test range of the clean flue gas analyzer is 0.01-5%, and the precision is 0.5%.
S5, monitoring the carbon dioxide capture rate of the lower absorption tower and the upper absorption tower respectively during operation, adjusting the flow regulating valve 18 of the lower liquid supply pump, controlling the carbon dioxide capture rate of the lower absorption tower to be not less than 60%, adjusting the flow regulating valve 14 of the upper liquid supply pump, controlling the carbon dioxide capture rate of the upper absorption tower to be not less than 50%, and ensuring the carbon dioxide capture rate of the whole tower to be not less than 80%.
S6, monitoring the concentration of the absorbent in the absorption liquid in the first tower kettle 10, when the concentration is lower than a set value, opening an absorption liquid discharge valve 22 and an absorption liquid discharge pump 21, conveying the absorption liquid to a subsequent regeneration system, determining the discharge amount of the absorption liquid according to the first tower kettle liquid level sensor 28, closing the absorption liquid discharge valve 22 and the absorption liquid discharge pump 21 after the discharge amount reaches the set value, opening a first upper absorption liquid return valve 17, replenishing the absorption liquid in the first tower kettle 10 according to the feedback value of the first tower kettle liquid level sensor 28 to the set value, closing the first upper absorption liquid return valve 17 after the replenishment, opening an absorption liquid replenishment valve 23 and an absorption liquid replenishment pump 24, and replenishing the absorption liquid in the second tower kettle 11 to the set value according to the feedback value of the second tower kettle liquid level sensor 27;
wherein the absorption liquid discharge pump is alkali-resistant and has a flow rate of 2m3Within the range of/h, the precision is 0.5 percent, the measurement range of the tower kettle-liquid level sensor is 1m, and the precision is 0.03 m. The process of discharging and supplementing the absorption liquid is automatically controlled by a control system, and the control system has the functions of automatic liquid level alarm and emergency pump stop. The concentration of the absorption liquid can be measured by an on-line concentration meter or by manual sampling.
S7, when the equipment is stopped, closing the raw flue gas inlet flow regulating valve 1 and the clean flue gas discharge valve 20 in sequence, closing the flue gas system, closing the lower liquid supply pump 12 and the lower liquid supply pump flow regulating valve 18 in sequence, closing the lower absorption cycle, closing the upper liquid supply pump 13 and the upper liquid supply pump flow regulating valve 14 in sequence, when the upper absorption tower has no absorption liquid backflow, closing the upper absorption liquid return valve 15 of the tower kettle II, closing the upper absorption cycle, closing each flue gas analyzer and sensor in sequence, and stopping the equipment.
The carbon dioxide absorption rate of the flue gas of the power plant obtained in the second embodiment is 82%, and the height of the absorption tower is reduced by 30% compared with the conventional design.
The application of this patent absorption tower and technology can effectively reduce the absorption tower height when carbon dioxide in the high-efficient absorption flue gas, but wide application in chemical industry environmental protection and carbon entrapment field.

Claims (10)

1. The utility model provides a two district dual cycle flue gas carbon dioxide absorption towers which characterized in that: comprises an absorption tower main body, a lower absorption packing layer (3), an upper absorption packing layer (4), a lower layer spray device (5), an upper layer spray device (6), an absorption tower demister (7), a tower kettle I (10), a tower kettle II (11) and an absorption liquid preparation box (25); the absorption tower main body is divided into an upper absorption tower and a lower absorption tower; a lower absorption packing layer (3) is arranged in the lower absorption tower, and a lower spraying device (5) is arranged above the lower absorption packing layer (3); an upper absorption packing layer (4) is arranged in the upper absorption tower, an upper spraying device (6) is arranged above the upper absorption packing layer (4), and an upper absorption liquid collector (8) is arranged below the upper absorption packing layer (4); an absorption tower demister (7) is arranged above the upper spraying device (6); the bottom of the absorption tower is provided with an original flue gas distributor (2); a raw flue gas inlet flow regulating valve (1) and a raw flue gas flowmeter (42) are arranged at the bottom inlet of the absorption tower; a clean flue gas discharge valve (20) is arranged at an outlet at the top of the absorption tower; a first tower kettle (10) and a second tower kettle (11) are sequentially arranged below the absorption tower; the tower kettle I (10) is connected to the lower-layer spraying device (5) through a lower-layer liquid supply pump (12), a lower-layer liquid supply pump flow regulating valve (18) and a lower-layer absorption liquid flowmeter (19) in sequence; the second tower bottom (11) is connected to the upper spraying device (6) through an upper liquid supply pump (13), an upper liquid supply pump flow regulating valve (14) and an upper absorption liquid flowmeter (16) in sequence; the upper layer absorption liquid collector (8) is respectively connected to the tower kettle I (10) and the tower kettle II (11) through an upper layer absorption liquid return tower kettle I valve (17) and an upper layer absorption liquid return tower kettle II valve (15); a liquid outlet of the first tower kettle (10) is sequentially connected to an absorption liquid discharge pump (21) and an absorption liquid discharge valve (22); the absorption liquid preparation box (25) is connected to the inlet of the tower bottom II (11) through an absorption liquid supplement pump (24) and an absorption liquid supplement valve (23) in sequence; the first tower kettle (10) and the second tower kettle (11) are respectively provided with a second tower kettle liquid level sensor (27) and a first tower kettle liquid level sensor (28).
2. The dual zone dual cycle flue gas carbon dioxide absorber of claim 1, wherein: the lower part of the upper absorption packing layer (4) is provided with an upper-layer packing wall-flow-proof ring (9).
3. The dual zone dual cycle flue gas carbon dioxide absorber of claim 1, wherein: an inlet of the absorption liquid preparation box (2) is provided with an inlet valve (26) of the absorption liquid preparation box.
4. The dual zone dual cycle flue gas carbon dioxide absorber of claim 1, wherein: an upper absorption liquid outlet thermometer (29) is arranged at the outlet of the upper absorption liquid collector (8); the absorption tower flue gas inlet pipeline is provided with a raw flue gas analyzer (30), a raw flue gas temperature sensor (31) and a raw flue gas pressure sensor (32); a lower-layer absorption liquid temperature sensor (33) is arranged on a pipeline from the tower kettle I (10) to the lower-layer spraying device (5); an upper-layer absorption liquid temperature sensor (34) is arranged on a pipeline from the tower kettle II (11) to the upper-layer spraying device (6); an interlayer flue gas analyzer (35), an interlayer flue gas temperature sensor (36) and an interlayer flue gas pressure sensor (37) are arranged between the lower absorption filler layer (3) and the upper absorption filler layer (4); a clean flue gas analyzer (38), a clean flue gas temperature sensor (39) and a clean flue gas pressure sensor (40) are arranged on the absorption tower smoke exhaust pipeline; and a liquid discharge pipeline of the first tower kettle (10) is provided with an absorption liquid discharge liquid temperature sensor (41).
5. A process for a two-zone two-cycle flue gas carbon dioxide absorber tower as claimed in claim 1, comprising the steps of:
s1, absorbent solution with a certain concentration is prepared in an absorbent preparation box (25), an absorbent supplement valve (23) and an absorbent supplement pump (24) are opened, fresh absorbent is conveyed to a second tower bottom (11), the absorbent supplement valve (23) and the absorbent supplement pump (24) are closed, an upper-layer liquid supply pump flow regulating valve (14) and an upper-layer absorbent return valve (17) are opened, an upper-layer absorbent return valve (15) is closed, an upper-layer liquid supply pump (13) is opened, the absorbent is conveyed to the first tower bottom (10), and the upper-layer liquid supply pump (13) is closed;
s2, opening an upper-layer liquid supply pump (13), spraying absorption liquid to an upper absorption packing layer (4) through an upper-layer spraying device (6) of an upper-layer absorption tower, closing a first valve (17) of an upper-layer absorption liquid returning tower kettle, opening a second valve (15) of the upper-layer absorption liquid returning tower kettle, opening an upper-layer absorption liquid flow meter (16), associating the upper-layer absorption liquid flow meter with the upper-layer liquid supply pump (13) for processing, and adjusting the flow of the absorption liquid to a set value;
s3, opening a lower liquid supply pump flow regulating valve (18), opening a lower liquid supply pump (12), spraying the absorption liquid to a lower absorption packing layer (3) through a lower spraying device (5) of a lower absorption tower, returning the absorption liquid to a tower kettle I (10), opening a lower absorption liquid flowmeter (19), associating the lower absorption liquid flowmeter with the lower liquid supply pump (12), and regulating the flow of the absorption liquid to a set value;
s4, opening a raw flue gas inlet flow regulating valve (1) and a clean flue gas discharge valve (20), opening a raw flue gas flowmeter (42), regulating the flow to a set flow according to a raw flue gas temperature sensor (31) and a raw flue gas pressure sensor (32), uniformly dispersing raw flue gas to the bottom of an absorption tower through a raw flue gas distributor (2), sequentially passing through a lower absorption packing layer (3), an upper absorption packing layer (4) and an absorption tower demister (7), and discharging the raw flue gas from the top of the absorption tower, wherein the carbon dioxide capture rate is obtained by calculating data collected by a raw flue gas analyzer (30), an interlayer flue gas analyzer (35) and a clean flue gas analyzer (38);
s5, monitoring the carbon dioxide capturing rate of the lower absorption tower and the upper absorption tower respectively during operation, adjusting a flow regulating valve (18) of a lower liquid supply pump, controlling the carbon dioxide capturing rate of the lower absorption tower to be not less than 60%, adjusting a flow regulating valve (14) of an upper liquid supply pump, controlling the carbon dioxide capturing rate of the upper absorption tower to be not less than 50%, and enabling the carbon dioxide capturing rate of the whole tower to be not less than 80%;
s6, monitoring the concentration of the absorption liquid in the first tower kettle (10), when the concentration is lower than a set value, opening an absorption liquid discharge valve (22) and an absorption liquid discharge pump (21), conveying the absorption liquid to a subsequent regeneration system, determining the discharge amount of the absorption liquid according to a first tower kettle liquid level sensor (28), closing the absorption liquid discharge valve (22) and the absorption liquid discharge pump (21) after the discharge amount reaches the set value, opening a first upper layer absorption liquid return valve (17), supplementing the absorption liquid in the first tower kettle (10) to the set value according to the feedback value of the first tower kettle liquid level sensor (28), closing a first upper layer absorption liquid return valve (17), opening an absorption liquid supplementing valve (23) and an absorption liquid supplementing pump (24), and supplementing the absorption liquid in the second tower kettle (11) to the set value according to the feedback value of a second tower kettle liquid level sensor (27);
s7, when the equipment is stopped, the original flue gas inlet flow regulating valve (1) and the clean flue gas discharge valve (20) are closed in sequence, the flue gas system is closed, the lower-layer liquid supply pump (12) and the lower-layer liquid supply pump flow regulating valve (18) are closed in sequence, the lower-layer absorption cycle is closed, the upper-layer liquid supply pump (13) and the upper-layer liquid supply pump flow regulating valve (14) are closed in sequence, when the upper-layer absorption tower does not return absorption liquid, the upper-layer absorption liquid return tower kettle two valve (15) is closed, the upper-layer absorption cycle is closed, each flue gas analyzer and each sensor are closed in sequence, and the equipment is stopped.
6. According to claimThe process of the double-zone double-circulation flue gas carbon dioxide absorption tower in the claim 1 is characterized in that: step S1, the absorption liquid preparation box is made of stainless steel or engineering plastic and has a volume of 1-10m3Within the range; the absorption liquid is organic amine absorbent, sodium hydroxide or potassium hydroxide; the stirrer of the absorption liquid preparation box is provided with 2-3 stirring blades and 1-3 stirring layers, and the rotating speed is within the range of 100-400 rpm; the flow rate of the absorption liquid replenishing pump is 2-5m3Within the range of/h, the precision is not lower than 1 percent; the second tower bottom is made of stainless steel material, the cross section is square or round, the height is within the range of 0.3-1m, and the volume is 1-3m3Within the range; a liquid level sensor is arranged in the second tower kettle, the measuring range of the liquid level sensor is 0.3-1m, and the precision is not lower than 0.05 m; the flow rate of the upper-layer liquid supply pump is 0.5-10m3Within the range of/h, the precision is not lower than 1%, and the outlet flow is regulated according to the feedback of the upper-layer absorption liquid flowmeter.
7. The process of the two-zone two-cycle flue gas carbon dioxide absorption tower of claim 1, wherein: step S2, the upper absorption tower is made of stainless steel, the inner diameter is not less than 100mm, and the effective filler height is not less than 1 m; the upper absorption packing layer uses regular packing made of stainless steel, plastic or ceramic, and the specific surface area of the packing is 50-800m2/m3In the range, the inclination angle of the filler is within the range of 30-60 degrees, the sheet thickness of the filler plate is within the range of 0.1-0.2mm, the height of the filler disc is within the range of 40-200mm, and the filler is provided with a wall flow prevention device; the upper layer of spraying device is made of stainless steel or alkali-resistant plastic, the density of the spraying points is determined according to the specific surface area of the filler, and when the specific surface area of the filler is not more than 600m2/m3When the density of the spraying points is not less than 250/m2When the specific surface area of the filler is more than 600m2/m3When the density of the spraying points is not less than 300/m2。
8. The process of the two-zone two-cycle flue gas carbon dioxide absorption tower of claim 1, wherein: step S3, the lower absorption tower is made of stainless steel, the inner diameter is not less than 100mm, and the effective filler height is not less than 1 m; the lower absorption packing layer uses regular packing materialThe filler is stainless steel, plastic or ceramic, and the specific surface area of the filler is 50-800m2/m3In the range, the inclination angle of the filler is within the range of 30-60 degrees, the sheet thickness of the filler plate is within the range of 0.1-0.2mm, the height of the filler disc is within the range of 40-200mm, and the filler is provided with a wall flow prevention device; the lower layer spraying device is made of stainless steel or alkali-resistant plastic, the density of the spraying points is determined according to the specific surface area of the filler, and when the specific surface area of the filler is not more than 600m2/m3When the density of the spraying points is not less than 250/m2When the specific surface area of the filler is more than 600m2/m3When the density of the spraying points is not less than 300/m2(ii) a The first tower bottom is made of stainless steel material, the cross section is square or round, the height is within the range of 0.3-1m, and the volume is 1-3m3Within the range; a liquid level sensor is arranged in the first tower kettle, the measuring range of the liquid level sensor is 0.3-1m, and the precision is not lower than 0.05 m; the flow rate of the lower layer liquid supply pump is 0.5-10m3Within the range of/h, the precision is not lower than 1%, the outlet flow is regulated according to the feedback of the lower-layer absorption liquid flowmeter, and the regulation precision is not lower than 1%.
9. The process of the two-zone two-cycle flue gas carbon dioxide absorption tower of claim 1, wherein: s4, the original flue gas inlet flow regulating valve is subjected to feedback regulation according to data collected by an original flue gas flowmeter, and the regulation precision is not lower than 1%; the raw flue gas distributor is made of stainless steel, plastic or ceramic, the gas outlet direction is downward, and the position is not lower than the first liquid level of the tower kettle; the carbon dioxide test range of the original flue gas analyzer is 5-25%, the precision is not lower than 0.5%, the carbon dioxide test range of the interlayer flue gas analyzer is 1-10%, the precision is not lower than 0.5%, the carbon dioxide test range of the clean flue gas analyzer is 0.01-5%, and the precision is not lower than 0.5%.
10. The process of the two-zone two-cycle flue gas carbon dioxide absorption tower of claim 1, wherein: in step S6, the flow rate of the absorption liquid discharge pump is 0.5 to 10m3Within the range of/h, the precision is not lower than 1 percent; the process of discharging and supplementing the absorption liquid is controlled by a control system, and the control system has the functions of automatic liquid level alarm and emergency pump stopCan be used.
CN202111086748.4A 2021-09-16 2021-09-16 Double-area double-circulation flue gas carbon dioxide absorption tower and process Pending CN113648805A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111086748.4A CN113648805A (en) 2021-09-16 2021-09-16 Double-area double-circulation flue gas carbon dioxide absorption tower and process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111086748.4A CN113648805A (en) 2021-09-16 2021-09-16 Double-area double-circulation flue gas carbon dioxide absorption tower and process

Publications (1)

Publication Number Publication Date
CN113648805A true CN113648805A (en) 2021-11-16

Family

ID=78494058

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111086748.4A Pending CN113648805A (en) 2021-09-16 2021-09-16 Double-area double-circulation flue gas carbon dioxide absorption tower and process

Country Status (1)

Country Link
CN (1) CN113648805A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114377522A (en) * 2022-01-21 2022-04-22 安徽理工大学 Carbon sealing device and using method
CN114515505A (en) * 2022-01-05 2022-05-20 中煤地第二勘探局集团有限责任公司 Method for capturing carbon in blast furnace flue gas

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114515505A (en) * 2022-01-05 2022-05-20 中煤地第二勘探局集团有限责任公司 Method for capturing carbon in blast furnace flue gas
CN114377522A (en) * 2022-01-21 2022-04-22 安徽理工大学 Carbon sealing device and using method

Similar Documents

Publication Publication Date Title
CN113648805A (en) Double-area double-circulation flue gas carbon dioxide absorption tower and process
CN104722203B (en) A kind of SCR denitration control system of flue gas of heating furnace and method
CN215916934U (en) Double-area double-circulation flue gas carbon dioxide absorption tower
CN212663207U (en) Baking soda dry purification device for waste incineration flue gas treatment
CN102544553A (en) Gas humidifying system for fuel cell testing platform
CN112546829A (en) Double-alkali carbon dioxide cyclic absorption device and process
CN104258719A (en) Desulfuration, denitration and dust removal (PM2.5 removal) three-in-one technical system for boiler exhaust gas by adopting ammonia method
CN201458752U (en) Urea hydrolysis system for preparing reducing agent needed by flue gas denitrification
CN112540158B (en) Method for testing utilization rate of limestone wet desulphurization forced oxidation air
CN109126408A (en) A kind of wet desulphurization device and intelligent control method
CN103007711B (en) Equipment and tail gas treatment method for synchronously treating tail gas of multiple graphitization furnaces
CN105749729A (en) Ammonification system based on automatic-adjusted pH value
CN108479380A (en) A kind of hypergravity SCR denitration device and its denitrating technique
CN113617196B (en) Flue gas desulfurization experiment simulation device
CN110237652A (en) A kind of spiral board reaction system automatically adjusting blade angle
CN106390707A (en) Flue gas wet-desulfurization system
CN213160199U (en) Closed-loop control's desulfurization system
CN111841259B (en) Control system and method for circulating absorption process of ammonia absorption tower
CN1467495A (en) On-line testing method for PH value of bypass supercritical water oxidation environment and private apparatus thereof
CN215388698U (en) Spray type reaction tower for industrial waste gas treatment
CN214486373U (en) Modularization limestone wet flue gas desulfurization reaction unit
CN209020156U (en) A kind of wet desulphurization device
CN213913106U (en) Double-alkali method carbon dioxide circulating absorption device
CN206688503U (en) A kind of high-performance circulating fluid bed desulfurization device
CN206082139U (en) A tail gas absorbing device for sulphuric acid apparatus for producing

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination