Tail gas control device suitable for capturing CO2 through absorption method

Abstract

The tail gas control device comprises a condensation mechanism and a high-frequency electric field communicated with the condensation mechanism, the condensation mechanism comprises a horizontally-arranged condensation cavity, a tail gas channel is arranged in the condensation cavity, the cross section of the tail gas channel is gradually enlarged from front to back, and the high-frequency electric field is communicated with the condensation cavity. Condensers which are sequentially arranged at intervals from front to back are arranged in the tail gas channel, a liquid drop collecting chamber is arranged at the lower end of the high-frequency electric field, a water outlet is formed in the bottom of the liquid drop collecting chamber, water is discharged through the water outlet, and then collected and removed water vapor and organic amine are fed into an absorption tower for circulation. The method can solve the problems of equipment damage and the like caused by too high water content in the tail gas after traditional water washing, can recover the organic amine in the tail gas, prolongs the service life of the organic amine absorbent, and ensures the trapping efficiency of the absorbent.

Description

Technical Field

[0001] The invention relates to a tail gas control device suitable for capturing CO2 by absorption method, belonging to the technical field of CO2 capture. Background Art

[0002] The large-scale emission of greenhouse gases has posed a serious threat to species ecology and human activities. The Paris Agreement stipulates that the global temperature rise will be controlled within 2°C compared with pre-industrial levels, and efforts will be made to keep the temperature rise within 1.5°C. Carbon capture, utilization and storage technology (CCUS) is considered to be one of the key technologies to mitigate global warming and is also a bottom-line technology for achieving the "dual carbon" policy.

[0003] Although China's CCUS technology started late, more than 50 related demonstration projects have been built so far. The more mature technology in the industry is chemical absorption technology, which is simple to operate, has a large absorption capacity and a high capture rate. The organic amines used in the chemical absorption method are highly volatile. Although the emission concentration of organic amines in the exhaust gas can be reduced by adding additives, it is still necessary to remove them by setting up water washing in the industry. After water washing, the concentration of organic amines in the exhaust gas is reduced, but the water vapor content in the exhaust gas is still at a high level. The CO2 infrared online detector is easily damaged or scrapped when detecting the CO2 concentration of the exhaust gas, thereby increasing the operating cost. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art and to propose a tail gas control device suitable for capturing CO2 by the absorption method, which can solve the problems such as equipment damage caused by excessive water content in the tail gas after traditional water washing. At the same time, the organic amines in the tail gas can be recovered, thereby increasing the service life of the organic amine absorbent and ensuring the capture efficiency of the absorbent.

[0005] To achieve the above-mentioned purpose, the present invention proposes an exhaust gas control device suitable for capturing CO2 by absorption method, including a condensation mechanism and a high-frequency electric field connected to the condensation mechanism, the condensation mechanism includes a horizontally arranged condensation chamber, an exhaust gas channel is arranged in the condensation chamber, the cross-section of the exhaust gas channel gradually increases from front to back, and condensers are arranged in sequence from front to back in the exhaust gas channel. A droplet collection chamber is provided at the lower end of the high-frequency electric field, and a drain outlet is provided at the bottom of the droplet collection chamber, and the liquid is discharged through the drain outlet, and then the collected and removed water vapor and organic amine are sent to an absorption tower for circulation.

[0006] Preferably, the cross-section of the exhaust gas passage is circular.

[0007] Preferably, the condensation chamber is connected to the droplet collection chamber through a connecting pipe.

[0008] Preferably, the condenser is composed of a plurality of condensing blades arranged in sequence at intervals, and the condensing blades of two adjacent condensers are arranged in a staggered manner.

[0009] Preferably, a confluence chamber and a diversion chamber are respectively provided at the upper and lower ends of the condensation chamber, the confluence chamber and the diversion chamber are connected through condensation blades, and a coolant outlet and a coolant inlet are respectively provided on the confluence chamber and the diversion chamber.

[0010] Preferably, the condensation blades are made of stainless steel, and the surfaces of the condensation blades are uniformly coated with a hydrophobic layer.

[0011] Preferably, after the exhaust gas is washed with water, the fine particles with larger particle sizes in the exhaust gas condense and grow into droplets, and the fine particles with smaller particle sizes enter the condensation chamber and the high-frequency electric field in turn for further removal.

[0012] Preferably, the high-frequency electric field includes two dust collecting electrodes and a corona electrode located between the two dust collecting electrodes, wherein the corona electrode is the cathode and the dust collecting electrode is the anode. A DC negative high voltage is applied between the two electrode plates, and the corona electrode generates a corona discharge, generating a large number of electrons and moving toward the dust collecting electrode. During the movement, the water vapor particles and organic amine particles in the exhaust gas are negatively charged and condensed. Under the action of the electric field force, the negatively charged particles move toward the anode to collect the water vapor and organic amine particles.

[0013] Beneficial effects of the present invention: The present invention removes water vapor and organic amines in the tail gas through condensation and the action of Coulomb force. Compared with the prior art, it can solve the problem of equipment damage caused by excessive water content in the tail gas after traditional water washing. At the same time, the organic amines in the tail gas can be recovered, the service life of the organic amine absorbent is increased, and the capture efficiency of the absorbent is guaranteed.

[0014] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of a tail gas control device suitable for capturing CO2 by absorption method according to the present invention; Figure 2 It is a partial top view of the condensation mechanism.

[0016] In the figure: 1-condensation mechanism, 2-high frequency electric field, 3-droplet collection chamber, 4-drain outlet, 5-connecting pipe, 11-condensation chamber, 12-exhaust channel, 13-condenser, 14-convergence chamber, 15-diversion chamber, 16-coolant outlet, 17-coolant inlet, 21-dust collecting electrode, 22-corona electrode, 131-condensation blade. DETAILED DESCRIPTION

[0017] See also Figure 1 ,2 The present invention discloses an exhaust gas control device suitable for capturing CO2 by absorption method, comprising a condensation mechanism 1 and a high-frequency electric field 2 connected to the condensation mechanism 1, wherein the condensation mechanism 1 comprises a horizontally arranged condensation chamber 11, wherein an exhaust gas channel 12 is arranged in the condensation chamber 11, wherein the cross section of the exhaust gas channel 12 gradually increases from front to back, wherein condensers 13 arranged in sequence from front to back are arranged in the exhaust gas channel 12, wherein a droplet collection chamber 3 is provided at the lower end of the high-frequency electric field 2, wherein a drain port 4 is provided at the bottom of the droplet collection chamber 3, and the liquid is discharged through the drain port 4, and then the collected and removed water vapor and organic amine are sent to an absorption tower for circulation.

[0018] The cross section of the exhaust passage 12 is circular.

[0019] The condensation chamber 11 is connected to the droplet collection chamber 3 through the connecting pipe 5 .

[0020] The condenser 13 is composed of a plurality of condenser blades 131 which are arranged in sequence at intervals, and the condenser blades 131 of two adjacent condensers 13 are arranged in a staggered manner.

[0021] The upper and lower ends of the condensation chamber 11 are respectively provided with a confluence chamber 14 and a diversion chamber 15 , the confluence chamber 14 and the diversion chamber 15 are connected through a condensation blade 131 , and the confluence chamber 14 and the diversion chamber 15 are respectively provided with a coolant outlet 16 and a coolant inlet 17 .

[0022] The condensing blade 131 is made of stainless steel, and the surface of the condensing blade 131 is evenly coated with a hydrophobic layer.

[0023] After the exhaust gas is washed with water, the fine particles with larger particle sizes in the exhaust gas condense and grow into droplets, and the fine particles with smaller particle sizes enter the condensation chamber 11 and the high-frequency electric field 2 in turn for further removal.

[0024] The high-frequency electric field 2 includes two dust collecting electrodes 21 and a corona electrode 22 located between the two dust collecting electrodes 21. The corona electrode 22 is a cathode, and the dust collecting electrode 21 is an anode. A DC negative high voltage is applied between the two electrode plates. The corona electrode 22 generates a corona discharge, generates a large number of electrons and moves toward the dust collecting electrode 21. During the movement, the water vapor particles and organic amine particles in the exhaust gas are negatively charged and condensed. Under the action of the electric field force, the negatively charged particles move toward the anode to collect the water vapor and organic amine particles.

[0025] Working process of the present invention: In the working process of the exhaust gas control device suitable for capturing CO2 by absorption method of the present invention, after the exhaust gas is washed with water, the fine particles with larger particle size in the exhaust gas condense and grow into droplets, and the fine particles with smaller particle size enter the condensation chamber 11 and the high-frequency electric field 2 in turn for further removal.

[0026] A tail gas channel 12 is provided in the condensation chamber 11, and the cross-section of the tail gas channel 12 gradually increases from front to back. A condenser 13 is provided in the tail gas channel 12, which is arranged in sequence from front to back. The condenser 13 is composed of a plurality of condensation blades 131 arranged in sequence, and the condensation blades 131 of two adjacent condensers 13 are staggered to increase gas turbulence, promote the collision of particles in the tail gas to form droplets, and condense and grow to form droplets under the condensation effect; the tail gas cooled by the condensation chamber enters the high-frequency electric field 2, and a DC negative high voltage is applied between the two plates. The corona electrode 22 generates corona discharge, generates a large number of electrons and moves to the dust collecting electrode 21. During the movement, the water vapor particles and organic amine particles in the tail gas are negatively charged and condensed. Under the action of the electric field force, the negatively charged particles move toward the anode to collect the water vapor and organic amine particles, and then fall into the droplet collection chamber 3, and are discharged through the drain port 4. Then the collected and removed water vapor and organic amine are sent to the absorption tower for circulation.

[0027] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. A tail gas control device suitable for capturing CO2 by absorption method, characterized in that: The invention comprises a condensation mechanism (1) and a high-frequency electric field (2) connected to the condensation mechanism (1), wherein the condensation mechanism (1) comprises a horizontally arranged condensation chamber (11), wherein an exhaust gas passage (12) is arranged in the condensation chamber (11), wherein the cross section of the exhaust gas passage (12) gradually increases from front to back, wherein condensers (13) are arranged in sequence from front to back in the exhaust gas passage (12), wherein a droplet collection chamber (3) is arranged at the lower end of the high-frequency electric field (2), wherein a drain outlet (4) is arranged at the bottom of the droplet collection chamber (3), and the water vapor and organic amines after the collection and removal are then sent to an absorption tower for circulation.

2. The tail gas control device for capturing CO2 by absorption method according to claim 1, characterized in that: The cross section of the exhaust gas channel (12) is circular.

3. A tail gas control device suitable for capturing CO2 by absorption method as claimed in claim 2, characterized in that: The condensation chamber (11) is connected to the droplet collection chamber (3) via a connecting pipe (5).

4. The tail gas control device for capturing CO2 by absorption method according to claim 1, characterized in that: The condenser (13) is composed of a plurality of condensing blades (131) arranged in sequence at intervals, and the condensing blades (131) of two adjacent condensers (13) are arranged in a staggered manner.

5. A tail gas control device suitable for capturing CO2 by absorption method as claimed in claim 4, characterized in that: The upper and lower ends of the condensation chamber (11) are respectively provided with a confluence chamber (14) and a diversion chamber (15); the confluence chamber (14) and the diversion chamber (15) are connected via a condensation blade (131); and the confluence chamber (14) and the diversion chamber (15) are respectively provided with a coolant outlet (16) and a coolant inlet (17).

6. A tail gas control device suitable for capturing CO2 by absorption method as claimed in claim 4, characterized in that: The condensation blade (131) is made of stainless steel, and the surface of the condensation blade (131) is evenly coated with a hydrophobic layer.

7. The tail gas control device for capturing CO2 by absorption method according to claim 1, characterized in that: After the exhaust gas is washed with water, fine particles with larger particle sizes in the exhaust gas condense and grow into droplets, while fine particles with smaller particle sizes enter the condensation chamber (11) and the high-frequency electric field (2) in turn for further removal.

8. A tail gas control device suitable for capturing CO2 by absorption method according to any one of claims 1 to 6, characterized in that: The high-frequency electric field (2) comprises two dust collecting electrodes (21) and a corona electrode (22) located between the two dust collecting electrodes (21), wherein the corona electrode (22) is a cathode and the dust collecting electrode (21) is an anode. A DC negative high voltage is applied between the two electrode plates, and the corona electrode (22) generates a corona discharge, generating a large number of electrons that move toward the dust collecting electrode (21). During the movement, water vapor particles and organic amine particles in the exhaust gas are negatively charged and condensed. Under the action of the electric field force, the negatively charged particles move toward the anode to collect the water vapor and organic amine particles.

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