CN111720848A - System for reducing temperature of smoke at outlet of wet desulphurization absorption tower - Google Patents
System for reducing temperature of smoke at outlet of wet desulphurization absorption tower Download PDFInfo
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- CN111720848A CN111720848A CN202010670025.8A CN202010670025A CN111720848A CN 111720848 A CN111720848 A CN 111720848A CN 202010670025 A CN202010670025 A CN 202010670025A CN 111720848 A CN111720848 A CN 111720848A
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- cooling
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- cooling water
- tower
- absorption tower
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 30
- 239000000779 smoke Substances 0.000 title claims description 34
- 238000001816 cooling Methods 0.000 claims abstract description 67
- 239000000498 cooling water Substances 0.000 claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 10
- 239000002002 slurry Substances 0.000 claims description 23
- 238000005507 spraying Methods 0.000 claims description 8
- 229910001039 duplex stainless steel Inorganic materials 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 34
- 239000003546 flue gas Substances 0.000 abstract description 31
- 238000006477 desulfuration reaction Methods 0.000 abstract description 19
- 230000023556 desulfurization Effects 0.000 abstract description 19
- 239000007788 liquid Substances 0.000 abstract description 11
- 230000009467 reduction Effects 0.000 abstract description 5
- 239000007921 spray Substances 0.000 abstract description 4
- 230000004048 modification Effects 0.000 abstract description 3
- 238000012986 modification Methods 0.000 abstract description 3
- 230000005494 condensation Effects 0.000 description 8
- 238000009833 condensation Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- -1 water vapor Chemical compound 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/04—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/20—Sulfur; Compounds thereof
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to the technical field of industrial flue gas pollution treatment, in particular to a system for reducing the temperature of flue gas at the outlet of a wet desulphurization absorption tower. The system comprises a cooling water tower arranged outside a desulfurization tower cylinder body, and a plurality of cooling modules arranged inside the desulfurization tower cylinder body and connected with the cooling water tower; the cooling module is arranged between the uppermost spray layer and the demister in the desulfurization tower and below the rest spray layers; the cooling module comprises a plurality of cooling water pipes, and the cooling water pipes are connected with the cylinder body of the desulfurizing tower through flanges; one end of the cooling water pipe is connected with a water outlet of the cooling water tower through a water inlet pipeline of the cooling module, and the other end of the cooling water pipe is connected with a water inlet of the cooling water tower through a water outlet pipeline of the cooling module. The invention not only can effectively realize the reduction of the temperature of the flue gas after the absorption tower, but also can reduce the carrying amount of liquid drops of the flue gas at the outlet of the desulfurizing tower, and has the advantages of small modification engineering amount, simple system, low investment cost and high adaptability.
Description
Technical Field
The invention relates to the technical field of industrial flue gas pollution treatment, in particular to a system for reducing the temperature of flue gas at the outlet of a wet desulphurization absorption tower.
Background
As is well known, the wet desulphurization technology is dominant in the domestic industrial coal-fired boiler flue gas desulphurization technology. However, in the industrial coal-fired boiler adopting the wet desulphurization technology, wet saturated flue gas at the outlet of the absorption tower is cooled in the process of being discharged through a chimney, and supersaturation and condensation are generated to form white smoke plume. In contrast, due to various factors, the temperature and the moisture content of the flue gas at the outlet of the absorption tower of the industrial coal-fired boiler need to be controlled, and the emission value of the controller is strictly controlled to realize the elimination of the white smoke plume.
In order to realize the treatment of white smoke plume at the outlet of a chimney, the current mainstream technology is to condense and cool the smoke at the outlet of an absorption tower, then heat and raise the temperature, and finally realize white elimination. Condensation cooling is a necessary link in the smoke plume treatment process, and on one hand, the reduction of the moisture content of smoke is realized, so that the aim of whitening reduction is fulfilled; on the other hand, a large amount of fine liquid drops are separated out after the saturated flue gas is condensed, and the liquid drops can adsorb a small amount of dust and SO2、SO3And the pollutant particles are used for further removing pollutants. The existing flue gas condensation technology is more commonly used and comprises a rear gas-liquid condensation tube type heat exchanger of an absorption tower and a liquid-liquid slurry plate type heat exchanger arranged on a slurry circulating pipeline outside the absorption tower. The former has more operation performance, but the modification work amount is very large, and has high requirements on the space between the absorption tower and the chimney because the former is usually arranged on a clean flue between the absorption tower and the chimney, and the flow speed in the gas-liquid condensation tube type heat exchanger is far lower than the flow speed of flue gas in the clean flueThe arrangement position of the gas-liquid condensing tube type heat exchanger usually needs larger flue variable cross section; in addition, in order to prevent the secondary carrying of the condensate caused by the flue gas, a flue demister is often added behind the gas-liquid condensation tube type heat exchanger, so that the complexity and the water consumption of a desulfurization system are increased. The latter has less operation performance, the liquid-liquid slurry plate heat exchanger has severe operation condition, the blockage and the abrasion of the heat exchanger body are easily caused, and once the heat exchanger body breaks down, the corresponding slurry circulating pump needs to be stopped for maintenance, so that great pressure is generated on the operation of the desulfurization system.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a system for reducing the smoke temperature at the outlet of a wet desulphurization absorption tower, which not only can effectively realize the reduction of the smoke temperature after the absorption tower, the reduction of the moisture content of smoke and the prevention of condensate liquid from being brought out of the absorption tower by the smoke, but also has the function of a certain demister and can reduce the carrying capacity of liquid drops of the smoke at the outlet of the desulphurization tower; the system has the advantages of small modification engineering amount, simple system, low investment cost and high adaptability.
The invention is realized by the following technical scheme:
a system for reducing the temperature of smoke at the outlet of a wet desulphurization absorption tower comprises a cooling tower arranged outside a desulphurization tower cylinder and a plurality of cooling modules arranged inside the desulphurization tower cylinder and connected with the cooling tower; the cooling module is arranged between the uppermost layer of the desulfurization tower and the demister in the tower, and below the rest layers of the desulfurization tower.
Preferably, the cooling module comprises a plurality of cooling water pipes, and the cooling water pipes are connected with the cylinder body of the desulfurizing tower through flanges; one end of the cooling water pipe is connected with a water outlet of the cooling water tower through a water inlet pipeline of the cooling module, and the other end of the cooling water pipe is connected with a water inlet of the cooling water tower through a water outlet pipeline of the cooling module.
Furthermore, the pipe diameter range of the cooling water pipe is phi 20 mm-phi 500 mm.
Furthermore, the cooling water pipe is made of duplex stainless steel.
Furthermore, the water inlet pipeline of each cooling water pipe is respectively provided with a valve.
Furthermore, the cooling water pipes are arranged in a layer and adopt a straight pipe bundle type or a snake-shaped pipe bundle type.
Furthermore, the plurality of cooling water pipes are arranged in an upper layer and a lower layer, the plurality of cooling water pipes in each layer are in a straight pipe bundle type, and the upper layer and the lower layer are alternately paved.
Preferably, the water inlet pipeline of the cooling module is connected with the plurality of cooling modules through a plurality of connecting branch pipes; and the connecting branch pipes are provided with cooling module water inlet control valves.
Preferably, the cooling module water inlet pipeline and the cooling module water outlet pipeline are both provided with pressure and temperature testing elements.
Preferably, a cooling water circulating pump is installed on the water inlet pipeline of the cooling module; and the slurry tank and the connecting pipeline of the spraying layer are respectively provided with a slurry circulating pump.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the invention, the cooling modules are arranged between the uppermost spray layer and the demister in the desulfurizing tower and below each spray layer, so that the cooling modules directly contact with flue gas in the tower for heat exchange, thereby realizing cooling of the flue gas in the tower, condensing saturated wet flue gas, and directly intercepting condensate into the absorption tower when the condensate passes through the demister in the tower along with the flue gas, thereby reducing the temperature of desulfurizing slurry and the temperature of flue gas in the desulfurizing tower in the desulfurizing operation process, and further reducing the temperature of exhaust smoke and the temperature of slurry of the desulfurizing tower; in the process of cooling the flue gas in the desulfurizing tower, soluble salts, sulfuric acid mist, organic matters and the like in the flue gas are separated out along with the condensation of water vapor in the flue gas, so that the colored smoke plume emission at the outlet of the chimney can be effectively relieved, and the generation of gypsum rain of the chimney is avoided; meanwhile, the low-temperature slurry can reduce the amount of flue gas in the tower, improve the liquid-gas ratio of a desulfurization device, improve the desulfurization efficiency and the synergistic dust removal effect, and compared with the existing flue condensation heat exchanger, the low-temperature slurry has the advantages of low newly-increased power consumption, small reconstruction workload, low investment, reliable operation and simple overhaul and maintenance; and the temperature of the desulfurization slurry can be flexibly adjusted by controlling the cooling water amount of the slurry cooling module according to different seasonal environment temperatures and different cooling water temperatures.
Furthermore, the cooling water pipe in the cooling module is made of duplex stainless steel and above materials, so that the corrosion resistance, the erosion wear resistance, the good mechanical property and the high strength of the cooling water pipe are ensured.
Furthermore, the mode of arranging the valve for independent control on the inlet pipeline of each cooling water pipe is adopted, so that the cooling water pipes can be separately disconnected when in fault or damage, and the normal operation of the whole cooling device is not influenced.
Furthermore, the pressure and temperature testing elements are respectively arranged on the water inlet pipeline of the cooling module and the water outlet pipeline of the cooling module, so that the operating pressure and temperature of the cooling water pipe can be effectively monitored.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Fig. 2 is a schematic structural diagram of a cooling module according to embodiment 1 of the present invention.
Fig. 3 is a schematic structural diagram of a cooling module according to embodiment 2 of the present invention.
Fig. 4 is a schematic structural diagram of a cooling module according to embodiment 3 of the present invention.
In the figure: 1-a cooling water tower, 2-a desulfurization tower flue gas inlet, 3-a slurry pool, 41-a cooling water circulating pump, 42-a slurry circulating pump, 5-a cooling module, 51-a cooling water pipe, 6-a desulfurization tower flue gas outlet, 7-a cooling module water inlet pipeline, 8-a spraying layer, 9-a cooling module water inlet control valve, 10-a cooling module water outlet pipeline, 11-a desulfurization tower cylinder and 12-a demister.
Detailed Description
The present invention will now be described in further detail with reference to the attached drawings, which are illustrative, but not limiting, of the present invention.
Example 1
The invention discloses a system for reducing the smoke temperature at the outlet of a wet desulphurization absorption tower, which comprises a desulphurization tower cylinder 11, a demister 12, a desulphurization tower smoke inlet 2, a desulphurization tower smoke outlet 6, a slurry pool 3, a spraying layer 8, a slurry circulating pump 42, a cooling module 5, a cooling water pipe 51, a cooling water tower 1, a cooling water circulating pump 41, a cooling module water inlet pipeline 7, a cooling module water inlet control valve 9 and a cooling module water outlet pipeline 10, wherein the desulphurization tower smoke inlet 2 is connected with the slurry pool 3 through a pipeline;
desulfurization slurry in a desulfurization tower cylinder body 11 enters a multilayer spraying layer 8 through a slurry circulating pump 42 and then falls from top to bottom, flue gas enters the desulfurization tower cylinder body 11 from a desulfurization tower flue gas inlet 2 from bottom to top, the flue gas is not only in countercurrent contact with the spraying slurry for cooling, but also is further subjected to heat exchange and cooling through a plurality of cooling water pipes 51 in a multilayer cooling module 5, in the process, wet saturated flue gas is changed into supersaturated wet flue gas, substances such as water vapor, soluble salt, sulfuric acid mist and organic matters in the flue gas are condensed and separated out from the flue gas, the generation of colored smoke plume at the outlet of a chimney and gypsum rain is relieved, and the treated flue gas is discharged from a desulfurization tower flue gas outlet 6 through a demister 12;
the high-temperature cooling water after heat exchange enters the cooling water tower 1 for cooling through the cooling module water outlet pipeline 10, and the low-temperature cooling water after cooling enters the cooling module 5 through the cooling module water inlet pipeline 7 and the cooling water circulating pump 41 to exchange heat with the desulfurization slurry and the flue gas;
wherein, the cooling water pipe 51 in the cooling module 5 adopts a straight pipe bundle type, as shown in fig. 2, and has simple processing and convenient maintenance.
Aiming at different cooling water sources of different power plants, the cooling water source of the invention can adopt circulating water, river water or seawater and the like in the cooling water tower 1.
Example 2
According to the system for reducing the smoke temperature at the outlet of the wet desulphurization absorption tower, as shown in fig. 3, the cooling water pipe 51 in the cooling module 5 is in a serpentine pipe bundle type, so that the action area of the cooling water pipe 51 is increased, the cooling efficiency is improved, and the rest of the structure is the same as that in the embodiment 1.
Example 3
According to the system for reducing the temperature of the smoke at the outlet of the wet desulphurization absorption tower, if the temperature of the smoke at the outlet is higher, the cooling module 5 shown in fig. 4 can be adopted, the cooling water pipes 51 in the cooling module 5 in fig. 4 are in a straight pipe bundle type and are laid in a vertically staggered mode, and the rest of the structure is the same as that in the embodiment 1.
The above embodiments 1-3 are preferred embodiments of the cooling module 5 of the present invention, and are not intended to limit the present invention, and the cooling module 5 may be modified, improved or replaced with equivalents within the principles of the present invention.
Claims (10)
1. A system for reducing the smoke temperature at the outlet of a wet desulphurization absorption tower is characterized by comprising a cooling tower (1) arranged outside a desulphurization tower cylinder (11) and a plurality of cooling modules (5) arranged in the desulphurization tower cylinder (11) and connected with the cooling tower (1); the cooling module (5) is arranged between the uppermost layer spraying layer (8) in the desulfurizing tower and the demister (12) in the tower, and the rest layers are arranged below the spraying layer (8).
2. The system for reducing the smoke temperature at the outlet of the wet desulphurization absorption tower according to claim 1, wherein the cooling module (5) comprises a plurality of cooling water pipes (51), and the cooling water pipes (51) are connected with the desulphurization tower cylinder (11) through flanges; one end of the cooling water pipe (51) is connected with the water outlet of the cooling water tower (1) through a cooling module water inlet pipeline (7), and the other end of the cooling water pipe is connected with the water inlet of the cooling water tower (1) through a cooling module water outlet pipeline (10).
3. The system for reducing the smoke temperature at the outlet of the wet desulphurization absorption tower according to claim 2, wherein the cooling water pipe (51) has a pipe diameter ranging from phi 20mm to phi 500 mm.
4. The system for reducing the smoke temperature at the outlet of the wet desulphurization absorption tower according to claim 2, wherein the cooling water pipe (51) is made of duplex stainless steel.
5. The system for reducing the smoke temperature at the outlet of the wet desulphurization absorption tower according to claim 2, wherein the inlet pipeline of each cooling water pipe (51) is provided with a valve.
6. The system for reducing the smoke temperature at the outlet of the wet desulphurization absorption tower according to claim 2, wherein the cooling water pipes (51) are arranged in a layer and adopt a straight pipe bundle type or a serpentine pipe bundle type.
7. The system for reducing the smoke temperature at the outlet of the wet desulphurization absorption tower according to claim 2, wherein the plurality of cooling water pipes (51) are arranged in an upper layer and a lower layer, the plurality of cooling water pipes (51) in each layer are in a straight pipe bundle type, and the upper layer and the lower layer are alternately laid.
8. The system for reducing the smoke temperature at the outlet of the wet desulphurization absorption tower according to claim 1, wherein the cooling module water inlet pipeline (7) is connected with a plurality of cooling modules (5) through a plurality of connecting branch pipes; and the connecting branch pipes are provided with cooling module water inlet control valves (9).
9. The system for reducing the outlet smoke temperature of the wet desulphurization absorption tower according to claim 1, wherein the inlet pipeline (7) of the cooling module and the outlet pipeline (10) of the cooling module are provided with pressure and temperature test elements.
10. The system for reducing the smoke temperature at the outlet of the wet desulphurization absorption tower according to claim 1, wherein a cooling water circulating pump (41) is installed on the cooling module water inlet pipeline (7); and a slurry circulating pump (42) is respectively arranged on the connecting pipeline of the slurry pool (3) and the spraying layer (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010670025.8A CN111720848A (en) | 2020-07-13 | 2020-07-13 | System for reducing temperature of smoke at outlet of wet desulphurization absorption tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010670025.8A CN111720848A (en) | 2020-07-13 | 2020-07-13 | System for reducing temperature of smoke at outlet of wet desulphurization absorption tower |
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| Publication Number | Publication Date |
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| CN111720848A true CN111720848A (en) | 2020-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010670025.8A Pending CN111720848A (en) | 2020-07-13 | 2020-07-13 | System for reducing temperature of smoke at outlet of wet desulphurization absorption tower |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112121590A (en) * | 2020-09-30 | 2020-12-25 | 华中科技大学 | Rectification-heat exchange coupling type tray and wet flue gas desulfurization tower |
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| CN212511237U (en) * | 2020-07-13 | 2021-02-09 | 西安热工研究院有限公司 | System for reducing temperature of smoke at outlet of wet desulphurization absorption tower |
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| CN112121590A (en) * | 2020-09-30 | 2020-12-25 | 华中科技大学 | Rectification-heat exchange coupling type tray and wet flue gas desulfurization tower |
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