CN104624045A - Dual-medium and dual-circulation desulphurization and dust removal device and method - Google Patents
Dual-medium and dual-circulation desulphurization and dust removal device and method Download PDFInfo
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- CN104624045A CN104624045A CN201510034481.2A CN201510034481A CN104624045A CN 104624045 A CN104624045 A CN 104624045A CN 201510034481 A CN201510034481 A CN 201510034481A CN 104624045 A CN104624045 A CN 104624045A
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Abstract
The invention belongs to the field of atmospheric environmental protection, and especially relates to a dual-medium and dual-circulation desulphurization and dust removal device and a dual-medium and dual-circulation desulphurization and dust removal method. According to the dual-medium and dual-circulation desulphurization and dust removal device and method, Flue gas flows into a first desulphurization area through a flue gas inlet, and the flue gas generates convective mass transfer with slurry droplets provided by a first circulation desulphurization device in the rising process; the flue gas flows into a second desulphurization area through a gas-liquid separating device, and the flue gas generates convective mass transfer with desulfurizer mixed liquid droplets provided by a second circulation desulphurization device for the second time in the rising process; the deeply desulphurized and dust-removed flue gas in which carried droplets are intercepted by a defogger is discharged out of a desulphurization tower. The dual-medium and dual-circulation desulphurization and dust removal device and method, provided by the invention, have the beneficial effects that the desulphurization efficiency is high, the slurry droplets cannot escape along with the flue gas, the primary investment and running energy consumption are low, the running cost is low, the load change adaption range is wide, and the utilization efficiency of the desulfurizer is high.
Description
(1) technical field
The invention belongs to atmospheric environment protection technical field, particularly a kind of two medium double circulation desulphurization and dust-removing device and desulfurization and dust-removal method.
(2) background technology
At present, the large medium-size boiler equipment desulfurization project capital construction of coal-burning power plant of China is complete, and in normal operation.Wet Flue Gas Desulfurization Technique is most widely used is calcium base hollow-spraying-tower.
But along with China's improving constantly environmental requirement, original reaction tower all cannot reach the requirement of new discharge standard.In order to meet emission request, a lot of desulfur technology supplier adopts the mode improving liquid-gas ratio or double-column in series to transform existing equipment.Although this mode likely can make the SO in flue gas
2reach discharge standard, but cause the significantly increase of desulphurization system energy consumption, cost performance reduces, and the discharge that the character of calcium base hollow-spraying-tower technique determines its flue dust can not meet the requirement of new standard.
(3) summary of the invention
The present invention, in order to make up the deficiencies in the prior art, provides a kind of desulfurization dust-removing efficiency is high, parallel-adder settle-out time is long, operating cost is cheap, absorbent utilization ratio is high two medium double circulation desulphurization and dust-removing device and desulfurization and dust-removal method.
The present invention is achieved through the following technical solutions:
A kind of two medium double circulation desulphurization and dust-removing device, comprise desulfurizing tower, it is characterized in that: described desulfurizing tower inside is provided with the first desulfurization zone and the second desulfurization zone from bottom to top successively, slurry pool is provided with below first desulfurization zone, gas-liquid separation device is provided with between first desulfurization zone and the second desulfurization zone, be provided with demister above second desulfurization zone, the first top, desulfurization zone is provided with the first circulation desulfurizing device, and the second top, desulfurization zone is provided with the second circulation desulfurizing device.
Described first desulfurization zone sidepiece is provided with smoke inlet, and gas-liquid separation device is connected with leakage fluid dram, and desulfurizing tower top is provided with exhanst gas outlet.
A kind of two medium double circulation desulphurization and dust-removing method, is characterized in that: comprise the following steps:
(1), flue gas enters the first desulfurization zone from smoke inlet, and the first circulation desulfurizing device extracts slurries in slurry pool and atomization sprays flue gas, flue gas in the process risen with the slurries generation counter current contact of spray, complete first time SO while cooling
2with the removing of flue dust;
(2) flue gas, after preliminary desulfurization retains the slurry droplet of the first desulfurization zone through gas-liquid separation device, enter the second desulfurization zone, the second circulation desulfurizing device extracts desulfurizing agent liquid and atomization sprays flue gas again, realizes the second time purification of flue gas;
(3) flue gas, after twice purification continues to rise through demister, retains the drop carried, and then discharges desulfurizing tower from exhanst gas outlet.
Preferably, the slurries in slurry pool are calcium-based desulfurizing agent.
Preferably, the desulfurizing agent liquid that the second circulation desulfurizing device extracts is sodium base desulfurizer.
Preferably, in slurry pool, the pH value of slurries is 5.5 ~ 6.5, and the temperature of flue gas through the first desulfurization zone is 60 DEG C ~ 100 DEG C, and the temperature of flue gas through the second desulfurization zone is 45 DEG C ~ 60 DEG C.
Preferably, the sulphite generated after the slurries that the first circulation desulfurizing device extracts carry out spray-absorption to flue gas, falling into slurry pool rear oxidation is sulfate, and outside crystallization desulfurizing tower.
The invention has the beneficial effects as follows: adopt two medium Two-way Cycle mode, by the spray flux lower than common spray column, improve desulfuration efficiency, and solve common spray column slurries droplet and to overflow the problem causing dust content to exceed standard with flue gas; Two-way Cycle independent operating, can control energy consumption respectively, adapts to boiler load change and different SO on a large scale
2change in concentration; Two-way Cycle is placed in a desulfurizing tower, reduces investment outlay, and is a kind of energy-efficient new desulfurization process.
(4) accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Accompanying drawing 1 is structural representation of the present invention;
Accompanying drawing 2 is process chart of the present invention;
In figure, 1 desulfurizing tower, 2 first desulfurization zone, 3 second desulfurization zone, 4 slurry pools, 5 gas-liquid separation devices, 6 demisters, 7 first circulation desulfurizing devices, 8 second circulation desulfurizing devices, 9 smoke inlets, 10 leakage fluid drams, 11 exhanst gas outlets.
(5) detailed description of the invention
Accompanying drawing is a kind of specific embodiment of the present invention.This embodiment comprises desulfurizing tower 1, desulfurizing tower 1 inside is provided with the first desulfurization zone 2 and the second desulfurization zone 3 from bottom to top successively, slurry pool 4 is provided with below first desulfurization zone 2, gas-liquid separation device 5 is provided with between first desulfurization zone 2 and the second desulfurization zone 3, demister 6 is provided with above second desulfurization zone 3, first top, desulfurization zone 2 is provided with the first top, circulation desulfurizing device 7, second desulfurization zone 3 and is provided with the second circulation desulfurizing device 8.First desulfurization zone 2 sidepiece is provided with smoke inlet 9, and gas-liquid separation device 5 is connected with leakage fluid dram 10, and desulfurizing tower 1 top is provided with exhanst gas outlet 11.Slurry pool 4 is connected with the first circulation desulfurizing device 7 by circulation slurry pump, and the second circulation desulfurizing device 8 is connected with the desulfurizing agent pond outside desulfurizing tower 1 by desulfurizing agent circulating pump, and the desulfurizing agent pond outside desulfurizing tower 1 is connected with leakage fluid dram 10.Oxidation and agitating device is provided with in slurry pool 4.
Adopt of the present invention pair of medium double circulation desulphurization and dust-removing method, first flue gas enters the first desulfurization zone 2 from smoke inlet 9, the slurries that first circulation desulfurizing device 7 utilizes circulation slurry pump to extract in slurry pool 4 carry out atomizing spray to flue gas, flue gas rise process in spray slurries generation counter current contact, complete while cooling first time SO
2with the removing of flue dust; Then flue gas is by the exhaust gases passes of gas-liquid separation device 5, rise and enter the second desulfurization zone 3, second circulation desulfurizing device 8 utilizes the mixed liquor extracting tower external desulfurizer pond to carry out second time atomizing spray to flue gas, flue gas after purification continues to rise through demister 6, retain the drop carried, then discharge desulfurizing tower 1 from exhanst gas outlet 11.Sprayed slurry in first desulfurization zone 2 falls to entering slurry pool 4, and the spray mixed liquor in the second desulfurization zone 3 falls to being collected by gas-liquid separation device 5, is discharged to tower external desulfurizer pond from leakage fluid dram 9.Slurries in first desulfurization zone 2 absorb SO
2the sulphite of rear generation is sulfate by oxidation air device forced oxidation after falling into slurry pool 4, and crystallization is discharged outside tower.
Claims (7)
1. a two medium double circulation desulphurization and dust-removing device, comprise desulfurizing tower (1), it is characterized in that: described desulfurizing tower (1) inside is provided with the first desulfurization zone (2) and the second desulfurization zone (3) from bottom to top successively, below, first desulfurization zone (2) is provided with slurry pool (4), gas-liquid separation device (5) is provided with between first desulfurization zone (2) and the second desulfurization zone (3), top, second desulfurization zone (3) is provided with demister (6), first desulfurization zone (2) top is provided with the first circulation desulfurizing device (7), second desulfurization zone (3) top is provided with the second circulation desulfurizing device (8).
2. the two medium double circulation desulphurization and dust-removing device of one according to claim 1, it is characterized in that: described first desulfurization zone (2) sidepiece is provided with smoke inlet (9), gas-liquid separation device (5) is connected with leakage fluid dram (10), and desulfurizing tower (1) top is provided with exhanst gas outlet (11).
3. carry out a method for desulfurization and dedusting according to the two medium double circulation desulphurization and dust-removing devices in claim 1-2 described in any one, it is characterized in that: comprise the following steps:
(1), flue gas enters the first desulfurization zone (2) from smoke inlet (9), first circulation desulfurizing device (7) extracts the slurries in slurry pool (4) and is atomized and sprays flue gas, flue gas rise process in spray slurries generation counter current contact, complete while cooling first time SO
2with the removing of flue dust;
(2) flue gas, after preliminary desulfurization retains the slurry droplet of the first desulfurization zone (2) through gas-liquid separation device (5), enter the second desulfurization zone (3), second circulation desulfurizing device (8) extracts desulfurizing agent liquid and atomization sprays flue gas again, realizes the second time purification of flue gas;
(3) flue gas, after twice purification continues to rise through demister (6), retains the drop carried, and then discharges desulfurizing tower (1) from exhanst gas outlet (11).
4. the method for desulfurization and dedusting according to claim 3, is characterized in that: the slurries in slurry pool (4) are calcium-based desulfurizing agent.
5. the method for desulfurization and dedusting according to claim 3, is characterized in that: the desulfurizing agent liquid that the second circulation desulfurizing device (8) extracts is sodium base desulfurizer.
6. the method for desulfurization and dedusting according to claim 3, it is characterized in that: the pH value of slurry pool (4) interior slurries is 5.5 ~ 6.5, the temperature of flue gas when the first desulfurization zone (2) is 60 DEG C ~ 100 DEG C, and the temperature of flue gas when the second desulfurization zone (3) is 45 DEG C ~ 60 DEG C.
7. the method for desulfurization and dedusting according to claim 3, it is characterized in that: the sulphite that the slurries that the first circulation desulfurizing device (7) extracts generate after carrying out spray-absorption to flue gas, falling into slurry pool (4) rear oxidation is sulfate, and crystallization desulfurizing tower (1) outward.
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| CN201510034481.2A CN104624045A (en) | 2015-01-23 | 2015-01-23 | Dual-medium and dual-circulation desulphurization and dust removal device and method |
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| CN201510034481.2A CN104624045A (en) | 2015-01-23 | 2015-01-23 | Dual-medium and dual-circulation desulphurization and dust removal device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105268307A (en) * | 2015-11-23 | 2016-01-27 | 金川集团股份有限公司 | Device and method for carrying out low-concentration SO2 smoke desulfurization through alkaline waste liquid |
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| US4452766A (en) * | 1982-08-30 | 1984-06-05 | Airpol, Inc. | Double alkali process for removal of sulfur dioxide from gas streams |
| CN101053744A (en) * | 2007-02-13 | 2007-10-17 | 浙江天蓝脱硫除尘有限公司 | Segmented calcium and sodium double alkali method desulfurizing technology and device thereof |
| CN102553428A (en) * | 2012-01-10 | 2012-07-11 | 华北电力大学（保定） | Absorption tower for desulfurization and denitrification combined with oxidant in forward-flow and back-flow spraying and method |
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| CN105268307A (en) * | 2015-11-23 | 2016-01-27 | 金川集团股份有限公司 | Device and method for carrying out low-concentration SO2 smoke desulfurization through alkaline waste liquid |
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