CN-121971949-A - Activated carbon flue gas purification system and technology based on double-analytic tower cooperative operation

CN121971949ACN 121971949 ACN121971949 ACN 121971949ACN-121971949-A

Abstract

The invention belongs to the field of flue gas purification, and particularly discloses an active carbon flue gas purification system and process based on cooperative operation of double analytic towers. The system comprises an adsorption unit, a resolving unit and an activated carbon conveyor. The adsorption unit comprises an air inlet channel, an adsorption device, an air outlet channel and a chimney, and the flue gas enters the adsorption device through the air inlet channel for purification and then enters the chimney through the air outlet channel and is discharged. The adsorption device at least comprises an adsorption tower. The resolving unit comprises a first resolving tower and a second resolving tower. The activated carbon conveyor can drive the activated carbon saturated by adsorption in the adsorption tower to enter the first and second desorption towers respectively for desorption and regeneration, and the regenerated activated carbon is transported back to the adsorption tower again, so that the continuous purification of flue gas and the efficient regeneration of the activated carbon are ensured. According to the invention, through the cooperative layout of the adsorption units and the double-analysis tower, the conveying efficiency of the activated carbon can be improved, the flue gas purifying efficiency is further improved, and the occupied area of equipment can be remarkably reduced.

Inventors

LI JIANGUANG
DENG ZENGJUN
ZENG WENFENG
LI JINZHONG
WANG BING
QIN BAIHAO
YI YUHAN

Assignees

湖南中冶长天节能环保技术有限公司

Dates

Publication Date: 20260505
Application Date: 20260205

Claims (10)

1. The active carbon flue gas purification system based on the cooperative operation of the double desorption towers is characterized by comprising an adsorption unit, a desorption unit and an active carbon conveyor, wherein the adsorption unit comprises an air inlet channel (L1), an adsorption device, an air outlet channel (L2) and a chimney (4), flue gas enters the adsorption device through the air inlet channel (L1) to be purified and then enters the chimney (4) through the air outlet channel (L2) to be discharged, the adsorption device at least comprises one adsorption tower, the desorption unit comprises a first desorption tower (2) and a second desorption tower (3), a material flow channel of the active carbon conveyor, a communicating pipe of a material inlet and outlet of the adsorption tower, a communicating pipe of a material inlet and outlet of the first desorption tower (2) and a communicating pipe of a material inlet and outlet of the second desorption tower (3) form a continuous active carbon conveying channel together, the active carbon conveying channel comprises a plurality of feeding channels and a plurality of discharging channels, the feeding channels are configured so that the material inlet of any adsorption tower can be communicated with the first desorption tower (2) and the second desorption tower (3), the feeding channels are configured to be communicated with the material inlet and outlet of the first desorption tower (2), and the active carbon conveying tower (3) can be communicated with the material outlet of the active carbon conveying tower, and the active carbon conveying tower can be communicated with the material inlet and the active carbon conveying tower through the discharging channel.
2. The activated carbon flue gas purification system based on the cooperative operation of double desorption towers according to claim 1, wherein the adsorption device comprises a primary adsorption tower (1), the feed channel comprises a first feed channel (X1) and a second feed channel (X2), the feed channel comprises a first feed channel (S1) and a second feed channel (S2), one end of the first feed channel (X1) is communicated with a feed port of the first desorption tower (2), the other end of the first feed channel is communicated with a feed port of the primary adsorption tower (1), one end of the second feed channel (X2) is communicated with a feed port of the second desorption tower (3), the other end of the second feed channel is communicated with a feed port of the primary adsorption tower (1), one end of the first feed channel (S1) is communicated with a feed port of the first desorption tower (2), and the other end of the second feed channel (S2) is communicated with a feed port of the primary adsorption tower (1), and the other end of the second feed channel (S2) is communicated with a feed port of the second desorption tower (3).
3. The activated carbon flue gas purification system based on cooperative operation of double resolution towers according to claim 2, wherein an air inlet of the primary adsorption tower (1) is communicated with a working condition flue gas source through the air inlet channel (L1), and an air outlet of the primary adsorption tower (1) is communicated with the chimney (4) through the air outlet channel (L2).
4. The activated carbon flue gas purification system based on the cooperative operation of double resolution towers according to claim 2, wherein the adsorption device further comprises a secondary adsorption tower (5) or a plurality of secondary adsorption towers (5) which are sequentially connected in series through flue gas connecting channels (L3), the feed channel further comprises a first diversion channel (T1) and a second diversion channel (T2) which are in one-to-one correspondence with the secondary adsorption towers (5), the discharge channel further comprises a third diversion channel (T3) and a fourth diversion channel (T4) which are in one-to-one correspondence with the secondary adsorption towers (5), one end of the first diversion channel (T1) is communicated with the first feed channel (X1), the other end of the first diversion channel is communicated with the feed inlet of the secondary adsorption towers (5), one end of the second diversion channel (T2) is communicated with the second feed inlet (X2), one end of the third diversion channel (T3) is communicated with the first discharge channel (S1), the other end of the third diversion channel (T3) is communicated with the feed inlet of the secondary adsorption towers (5), and the other end of the third diversion channel (T3) is communicated with the second discharge channel (S2).
5. The activated carbon flue gas purification system based on cooperative operation of double resolution towers as claimed in claim 4, wherein the air inlet of the primary adsorption tower (1) is communicated with a working condition flue gas source through the air inlet channel (L1), the air outlet of the primary adsorption tower (1) is communicated with the air inlet of the first secondary adsorption tower (5) through the flue gas connecting channel (L3), the air outlet and the air inlet of the adjacent secondary adsorption towers (5) are communicated through the flue gas connecting channel (L3), and the air outlet of the last secondary adsorption tower (5) is communicated with the chimney (4) through the air outlet channel (L2).
6. The activated carbon flue gas purification system based on the cooperative operation of the double-resolution towers according to any one of claims 1 to 5 is characterized in that the number of the adsorption units is one or more, a plurality of the adsorption units are arranged in parallel on the activated carbon conveying channel, and the adsorption units are used for adsorbing and purifying flue gas under different working conditions.
7. The activated carbon flue gas purification system based on cooperative operation of double resolution towers of any one of claims 1 to 6, further comprising at least one activated carbon distribution device arranged at a branching node of the activated carbon conveying channels for distributing activated carbon to different downstream conveying channels.
8. The activated carbon flue gas purification system based on cooperative operation of double resolution towers of any one of claims 1 to 7, wherein the activated carbon conveyor comprises one or more of a Z-type conveyor, a scraper conveyor and a bucket elevator.
9. The activated carbon flue gas purification process based on the cooperative operation of the double-resolution towers is characterized by being applied to the activated carbon flue gas purification system based on the cooperative operation of the double-resolution towers according to any one of claims 1-8, and comprises the following steps: s1, introducing working condition flue gas into an adsorption tower of a corresponding adsorption unit for adsorption purification, introducing the purified flue gas into a chimney (4), and then discharging; S2, selectively conveying the activated carbon which is adsorbed and saturated in the adsorption towers of the adsorption units to a first analysis tower (2) and a second analysis tower (3) respectively through a discharge channel for analysis and regeneration; S3, selectively conveying the activated carbon regenerated in the first analysis tower (2) and the second analysis tower (3) back to the adsorption towers of the adsorption units respectively through the feed channels.
10. The activated carbon flue gas purification process based on the cooperative operation of double resolution towers as recited in claim 9, wherein the step S1 further comprises: s101, respectively introducing working condition flue gas into primary adsorption towers (1) of corresponding adsorption units through air inlet channels (L1); s102, sequentially introducing the flue gas subjected to adsorption purification in the primary adsorption tower (1) into each secondary adsorption tower (5) through a flue gas connecting channel (L3); S103, introducing the flue gas which is adsorbed and purified in the last secondary adsorption tower (5) into a chimney (4) through an air outlet channel (L2).

Description

Activated carbon flue gas purification system and technology based on double-analytic tower cooperative operation Technical Field The invention relates to the technical field of flue gas purification, in particular to an active carbon flue gas purification system and process based on cooperative operation of double analytic towers. Background The industrial flue gas (comprising the fields of coal-fired power plants, steel sintering, garbage incineration and the like) contains various pollutants such as SO 2、NOx, dioxin, heavy metals and the like, and the pollutants become important factors threatening the ecological environment and human health. The active carbon adsorption process has been developed as a mainstream technology path in the field of industrial flue gas treatment by virtue of its core advantage of efficient synergistic purification of various pollutants. In the process system, the activated carbon after saturated adsorption is heated and regenerated by an analytical tower, and the regenerated activated carbon is recycled to the adsorption system for continuous use. The analytical tower sequentially comprises a charging section, a heating section, a degassing section, a cooling section and a discharging section from top to bottom, wherein the heating section and the cooling section adopt a multi-tube heat exchanger structure, the activated carbon passes through a tube pass, and the heat exchange gas passes through a shell pass. The method is limited by the requirements of uniform temperature and air flow distribution, anti-blocking design standards, equipment manufacturing and transportation difficulties, capability of matched conveying equipment and upper limit of length, the maximum single tower analytic capability of the analytic tower in the current market is only 40t/h, the corresponding cross section size is 6.2mx4.2m at maximum, and the actual conveying capability of part of equipment cannot reach the design standards. Meanwhile, the heating air inlet and outlet of the existing analytic tower adopt a single-inlet single-outlet mode, if the tower body is oversized, uneven distribution of the near-end temperature field and the far-end temperature field of the heating air inlet can be caused, and further unbalance of the active carbon temperature field of the degassing section is caused, uneven thermal stress of the heated expansion of the heat exchange tube is caused, faults such as damage to the heat exchange tube and weld joint cracking are easy to occur, machining precision is difficult to guarantee due to the oversized tower body structure size, and the service life of equipment is directly influenced. The adsorption tower and the analytic tower are used as core devices of the whole set of purification system, the research and optimization of the adsorption tower in the industry is more complete, the emission index is continuously optimized, but the technical attention of the analytic tower is insufficient. The problems of insufficient resolving power, poor running stability and the like of the resolving tower can directly limit the purification efficiency of the whole system, thereby influencing the capacity release of upstream production equipment. While some design houses and enterprises optimize the partial problems of the analysis tower, such as pipeline blockage, cooling section heat exchange pipe leakage and the like, a systematic solution is not provided for the core pain point of insufficient analysis capability. Therefore, for the activated carbon flue gas purification project with large flue gas amount and high desulfurization amount, the prior art adopts a double series process (namely two independent adsorption-analysis systems), so that equipment redundancy, large occupied area and high investment and operation cost are caused, and the method becomes a key problem to be solved urgently in the industry. The core configuration of the conventional double-series cross-flow moving bed active carbon purification device is that two independent systems of a primary adsorption tower, a secondary adsorption tower (if any) and a single analysis tower are adopted, each system is used for independently completing adsorption-analysis circulation, and the two systems are used for sharing and processing the large flue gas treatment load in parallel. However, this prior art has the following significant drawbacks: 1. Because of the reasons of equipment capacity, structural limitation and the like, two sets of independent adsorption-analysis devices are required to be arranged in a large flue gas amount project, the investment of equipment and supporting facilities is high, the occupied area is large (generally, the occupied area is increased by more than 40% compared with a single series of independent installation spaces of two sets of systems), and the energy consumption is high due to the parallel operation of the two sets of systems. 2. In the existing two-stage adsorption process, th