CN109482039B

CN109482039B - Counter-current flue gas purification device

Info

Publication number: CN109482039B
Application number: CN201811536937.5A
Authority: CN
Inventors: 朱廷钰; 李玉然; 王斌; 林玉婷
Original assignee: Institute of Process Engineering of CAS
Current assignee: Institute of Process Engineering of CAS
Priority date: 2018-12-14
Filing date: 2018-12-14
Publication date: 2020-09-11
Anticipated expiration: 2038-12-14
Also published as: CN109482039A

Abstract

The invention belongs to the technical field of flue gas purification, and discloses a countercurrent flue gas purification device. The countercurrent flue gas purification device comprises a tower body, the tower body comprises at least two purification areas which are communicated with each other from top to bottom, each purification area is provided with an inlet and an outlet, the inlet is positioned at each of the bottoms of the purification areas, the outlet is positioned at each of the tops of the purification areas, a flowing adsorbent is arranged in the purification areas, and flue gas enters from the inlet to be adsorbed by the purification areas and then is discharged from the outlets. The adsorbent of the countercurrent flue gas purification device is in countercurrent contact with flue gas, has the advantages of good adsorption effect, simple structure, less equipment, smooth running of activated carbon, low wear rate and high utilization rate, can obviously improve the flue gas purification efficiency, and has considerable economic benefit.

Description

Counter-current flue gas purification device

Technical Field

The invention relates to the technical field of flue gas purification, in particular to a countercurrent flue gas purification device.

Background

The activated carbon flue gas purification technology has the advantages of high desulfurization efficiency, capability of simultaneously realizing denitration, dioxin removal, hydrogen sulfide removal, dust removal, no wastewater and the like, and is a flue gas purification technology with great development prospect. The prior flue gas purification process by an activated carbon method is widely applied in industry, and the technologies are mainly single-stage multi-chamber cross-flow moving bed and double-stage cross-flow moving bed. The desulfurization efficiency can reach more than 98 percent, the denitration efficiency of the single-stage multi-chamber cross-flow moving bed is about 33 to 40 percent, and the denitration efficiency of the multi-stage series connection is about 60 to 70 percent; the denitration efficiency of the double-stage cross-flow moving bed can reach 70-80%. With the increasing strictness of the environmental protection policy, the single-stage multi-chamber cross-flow moving bed and the double-stage cross-flow moving bed in the activated carbon desulfurization and denitrification technology cannot well meet the emission requirement.

Chinese patent publication No. CN 108371872 a, "a desulfurization and denitrification apparatus for high efficiency denitrification", discloses an activated carbon desulfurization and denitrification apparatus, which is mainly characterized in that a single-stage cross-flow moving bed absorption tower has a certain improvement in denitrification efficiency, but the overall efficiency is not high.

Chinese patent publication No. CN 106693603A, "counter-current flue gas purification apparatus and flue gas purification method by activated carbon method", discloses an activated carbon absorption tower apparatus, which is characterized in that the activated carbon absorption tower includes an upper activated carbon bed layer part and a lower activated carbon bed layer part, and a transition region located between the two parts, the activated carbon bed layer part is separated by a porous partition plate to form 2-7 activated carbon chambers, and the thicknesses of the activated carbon chambers located at the lower part are sequentially thickened along the flow direction of flue gas, which is essentially a two-stage cross-flow moving bed technology.

Chinese patent No. CN 107812444A discloses a sectional activated coke partial circulation desulfurization and denitrification system, which is characterized in that flue gas is firstly desulfurized by one activated carbon tower and then denitrated by the other activated carbon tower, and is a cross-flow bed with a two-stage series structure. Although the device can achieve certain purification efficiency, the device has the advantages of large occupied area, more equipment and low effective utilization rate of the activated carbon.

The contact between the active carbon of the single-stage/double-stage cross-flow moving bed designed in the current patent and the flue gas is not sufficient, and the effective utilization rate of the active carbon is not high. Therefore, a new type of counter-current flue gas cleaning device is needed to solve the above problems.

Disclosure of Invention

The invention aims to provide a counter-flow flue gas purification device to solve the problem that the existing counter-flow flue gas purification device adopting cross-flow contact is low in purification efficiency.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a flue gas purification device against current, includes the tower body, the tower body includes the clean area of intercommunication about two at least, every the clean area all is equipped with import and export, the import is located every the bottom of clean area, the export is located every the top of clean area, be equipped with mobile adsorbent in the clean area, flue gas by import gets into follow after the clean area adsorbs the export is discharged.

Preferably, the top and the bottom of the tower body are respectively provided with a feeding area and a discharging area, and the adsorbent flows into the upper purifying area and the lower purifying area from the feeding area to top in sequence and is discharged from the discharging area.

Preferably, the feeding area and the discharging area are both provided with valves, and the valves are double-layer nitrogen sealing valves.

Preferably, a gas outlet area is arranged at the top of each purification area, and the gas outlet areas are communicated with the outlets.

Preferably, a plurality of tapered passages with wide top and narrow bottom are arranged between the feeding zone and the upper purifying zone, between the upper purifying zone and the lower purifying zone, and between the lower purifying zone and the discharging zone, and the tapered passages between the feeding zone and the upper purifying zone and between the upper purifying zone and the lower purifying zone are arranged in the gas outlet zone in a penetrating manner.

Preferably, a long shaft discharger is arranged below the conical channel between the lower purifying area and the discharging area, and the adsorbent enters the discharging area through the conical channel through the long shaft discharger.

Preferably, a conical baffle is arranged in the feeding zone, the conical baffle is positioned above the upper purification zone, and the side edge of the conical baffle is smoothly connected with the conical channel between the feeding zone and the upper purification zone.

Preferably, the adsorbent is any one or a combination of at least two of activated carbon, activated coke, activated semicoke and semi-coke.

The invention has the beneficial effects that:

the adsorbent of the countercurrent flue gas purification device is in countercurrent contact with flue gas, has the advantages of good adsorption effect, simple structure, less equipment, smooth running of activated carbon, low wear rate and high utilization rate, can obviously improve the flue gas purification efficiency, and has considerable economic benefit.

Drawings

FIG. 1 is a schematic structural diagram of a counter-current flue gas purification device provided by the present invention;

fig. 2 is a schematic cross-sectional view of a counter-current flue gas cleaning device provided by the present invention.

In the figure:

1. a purification zone; 11. an inlet; 12. an outlet; 13. an adsorbent; 14. a gas outlet zone;

21. a feed zone; 22. a discharge area; 23. a valve; 24. a conical baffle;

31. a tapered channel; 32. a long shaft discharger.

Detailed Description

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

As shown in fig. 1, the present invention provides a counter-current flue gas purification device, which comprises a tower body, comprising at least two purification regions 1 which are communicated up and down, wherein the top and the bottom of the tower body are respectively provided with a feeding region 21 and a discharging region 22, the feeding region 21 and the discharging region 22 are both provided with a valve 23, the valve 23 is preferably a double-layer nitrogen-sealed valve, and the adsorbent 13 sequentially flows into the upper purification region 1 and the lower purification region 1 from top to bottom through the valve 23 of the feeding region 21, and is discharged from the valve 23 of the discharging region 22. Every purifying area 1 all is equipped with import 11 and export 12, import 11 is located the bottom of every purifying area 1, export 12 is located the top of every purifying area 1, be equipped with mobile adsorbent 13 in the purifying area 1, the top of every purifying area 1 all is equipped with out gas zone 14, it communicates with export 12 to go out gas zone 14, in every purifying area 1, the flue gas homoenergetic gets into in this purifying area 1 by import 11 and adsorbs the back with adsorbent 13, discharge from export 12 along going out gas zone 14. The adsorbent 13 of the countercurrent flue gas purification device is in countercurrent contact with flue gas, has the advantages of good adsorption effect, simple structure, less equipment, smooth running of activated carbon, low wear rate and high utilization rate, can obviously improve the flue gas purification efficiency, and has considerable economic benefit.

As shown in fig. 2, which is a schematic sectional view of the counter-current flue gas cleaning device provided by the present invention, a plurality of tapered channels 31 with wide top and narrow bottom are arranged between the feeding zone 21 and the upper cleaning zone 1, between the upper cleaning zone 1 and the lower cleaning zone 1, and between the lower cleaning zone 1 and the discharging zone 22. Wherein, the conical passages 31 between the feeding area 21 and the upper purifying area 1 and between the upper purifying area 1 and the lower purifying area 1 are all arranged through the gas outlet area 14, the adsorbent 13 enters the upper purifying area 1 from the feeding area 21 through the conical passages 31, the adsorbent 13 in the upper purifying area 1 enters the lower purifying area 1 through the conical passages 31, and finally the conical passages 31 in the lower purifying area 1 enter the discharging area 22.

Specifically, a conical baffle 24 is arranged in the feeding area 21, the conical baffle 24 is positioned above the upper purification area 1, and the side edge of the conical baffle 24 is smoothly connected with a conical channel 31 positioned between the feeding area 21 and the upper purification area 1, so that the adsorbent 13 can enter the purification area 1 from the feeding area 21 more smoothly. It is to be understood that the number of the conical baffles 24 in fig. 2 is one, and when the number of the conical passages 31 between the feed zone 21 and the upper purification zone 1 is n (n is 3 or more), the number of the conical baffles 24 is n-1, i.e., the number of the conical baffles 24 is not limited by the present invention, and is determined according to the number of the conical passages 31 between the feed zone 21 and the upper purification zone 1.

Further, a long shaft discharger 32 is provided below the tapered passage 31 between the lower purification zone 1 and the discharge zone 22, the adsorbent 13 is introduced from the tapered passage 31 into the discharge zone 22 through the long shaft discharger 32, the tapered passage 31 connected to the long shaft discharger 32 functions to reduce the discharge resistance of the long shaft discharger 32 in addition to the above-described function of facilitating the discharge, and the adsorbent 13 is allowed to fall from the plurality of discharge passages 31 into the discharge zone 22 by the communication between the plurality of discharge passages 31 and the long shaft discharger 32 when the long shaft discharger 32 rotates for discharge.

Specifically, the adsorbent 13 is a granular catalyst, and may be, for example, any one or a combination of at least two of activated carbon, activated coke, activated semicoke, and semi-coke, and is preferably activated carbon.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art based on the foregoing description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A counter-current flue gas purification device comprises a tower body and is characterized in that the tower body comprises at least two purification areas (1) which are communicated up and down, each purification area (1) is provided with an inlet (11) and an outlet (12), the inlet (11) is positioned at the bottom of each purification area (1), the outlet (12) is positioned at the top of each purification area (1), a flowing adsorbent (13) is arranged in each purification area (1), and flue gas enters the purification areas (1) from the inlets (11) to be adsorbed and then is discharged from the outlets (12);

the top and the bottom of the tower body are respectively provided with a feeding area (21) and a discharging area (22), and an adsorbent (13) sequentially flows into the upper purifying area (1) and the lower purifying area (1) from top to bottom from the feeding area (21) and is discharged from the discharging area (22);

the top of each purification area (1) is provided with an air outlet area (14), and the air outlet area (14) is communicated with the outlet (12);

a plurality of tapered channels (31) which are wide at the top and narrow at the bottom are arranged between the feeding area (21) and the upper purifying area (1), between the upper purifying area (1) and the lower purifying area (1) and between the lower purifying area (1) and the discharging area (22), and the tapered channels (31) which are positioned between the feeding area (21) and the upper purifying area (1) and between the upper purifying area (1) and the lower purifying area (1) are all arranged in the gas outlet area (14) in a penetrating way.

2. Counter-current flue gas purification device according to claim 1, wherein both the feeding zone (21) and the discharge zone (22) are provided with valves (23), the valves (23) being double-layer nitrogen-tight valves.

3. Counter-current flue gas cleaning apparatus according to claim 1, characterized in that a long axis discharger (32) is arranged below said conical channel (31) between said lower cleaning zone (1) and said discharge zone (22), and that sorbent (13) is introduced from said conical channel (31) through said long axis discharger (32) into said discharge zone (22).

4. Counter-current flue gas cleaning device according to claim 1, characterized in that a conical baffle (24) is provided in the feed zone (21), the conical baffle (24) being located above the upper cleaning zone (1), and the sides of the conical baffle (24) being in smooth connection with the conical channel (31) between the feed zone (21) and the upper cleaning zone (1).

5. Counter-current flue gas cleaning device according to any one of claims 1 to 4, characterized in that the adsorbent (13) is any one or a combination of at least two of activated carbon, activated coke, activated semi-coke or semi-coke.