CN113758014A - Flue gas control system and method for boiler flue gas desulfurization - Google Patents
Flue gas control system and method for boiler flue gas desulfurization Download PDFInfo
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- CN113758014A CN113758014A CN202110939217.9A CN202110939217A CN113758014A CN 113758014 A CN113758014 A CN 113758014A CN 202110939217 A CN202110939217 A CN 202110939217A CN 113758014 A CN113758014 A CN 113758014A
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 239000003546 flue gas Substances 0.000 title claims abstract description 56
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 17
- 230000023556 desulfurization Effects 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000007246 mechanism Effects 0.000 claims abstract description 57
- 238000002485 combustion reaction Methods 0.000 claims abstract description 22
- 230000001939 inductive effect Effects 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 230000003009 desulfurizing effect Effects 0.000 claims description 10
- 239000000446 fuel Substances 0.000 abstract description 9
- 239000000779 smoke Substances 0.000 description 6
- 238000001816 cooling Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
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- Engineering & Computer Science (AREA)
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- Thermal Sciences (AREA)
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention provides a flue gas control system and a flue gas control method for boiler flue gas desulfurization, which belong to the technical field of boiler flue gas control and comprise a first air supply mechanism, a first air inducing mechanism, two booster fans, a first combustion mechanism and a control module; when one of the two first air blowers, the two first induced draft fans and the booster fan trips, one of the two first air blowers, the two first induced draft fans and the two booster fans is closed, and one group of the first feeding pipes is closed; when the two first air blowers are all tripped, the two first induced draft fans are all tripped or the two booster fans are all tripped, all the first induced draft fans, the first air blowers and the booster fans are closed, and the two groups of first feeding pipes are closed; compared with the prior art, when the first air feeder is tripped completely, the first induced draft fan is tripped completely or the booster fan is tripped completely, all the fans are closed and all fuel is cut off, and the situation that equipment is damaged due to too high pressure in the boiler is avoided.
Description
Technical Field
The invention belongs to the technical field of boiler flue gas control, and particularly relates to a flue gas control system and a flue gas control method for boiler flue gas desulfurization.
Background
The boiler flue gas desulfurization is a process for removing sulfur-containing compounds in flue gas, and in the prior art, the boiler flue gas is introduced into a desulfurizing tower for flue gas desulfurization; when a boiler of a power plant normally operates, the total smoke and air in the boiler can be balanced through an air feeder and an induced draft fan at an air inlet and a smoke outlet of the boiler; however, after the blower or the induced draft fan is tripped, the fuel led into the boiler cannot be cut off in time, so that the internal pressure of the boiler is increased, and equipment damage accidents can occur.
Disclosure of Invention
The embodiment of the invention provides a flue gas control system and a flue gas control method for boiler flue gas desulfurization, and aims to solve the technical problem that equipment is damaged because boiler fuel cannot be cut off in time after a blower or an induced draft fan is tripped in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
a flue gas control system for boiler flue gas desulfurization is provided, comprising:
the first air supply mechanism comprises two first air supplies arranged in parallel, and the two first air supplies are suitable for being communicated with an air inlet of the boiler after being connected in parallel;
the first induced draft mechanism comprises two first induced draft fans which are arranged in parallel, and the two first induced draft fans are suitable for being communicated with the air outlet of the boiler after being connected in parallel;
the supercharging mechanism comprises two supercharging fans which are arranged in parallel; the two booster fans are connected with the two first induced draft fans in series through a pipeline;
the first combustion mechanism comprises two groups of first feeding pipes which are suitable for being communicated with the boiler, and a first valve is arranged on each first feeding pipe;
the control module is respectively and electrically connected with the two first air blowers, the two first induced draft fans, the two booster fans and the first valve;
when one of the two first air blowers, the two first induced draft fans and the two booster fans trips, the control module controls the operation quantity of the first air blowers, the first induced draft fans and the booster fans to be one, and the control module controls one group of first valves to be closed;
when tripping operation is carried out on all the first air blowers, tripping operation is carried out on all the first induced draft fans or tripping operation is carried out on all the booster fans, the control module controls all the first air blowers, the first induced draft fans and the booster fans to be powered off, and the control module controls two sets of first valves to be closed.
In one possible implementation, the flue gas control system further includes:
the second air supply mechanism comprises two second air supplies which are arranged in parallel, and the two second air supplies are suitable for being communicated with an air inlet of a second boiler after being connected in parallel;
the second induced draft mechanism comprises two second induced draft fans which are arranged in parallel, and the two second induced draft fans are suitable for being communicated with the air outlet of the second boiler after being connected in parallel;
the second combustion mechanism comprises two groups of second feeding pipes which are suitable for being communicated with a second boiler, and a second valve is arranged on each second feeding pipe;
the first air inducing mechanism and the second air inducing mechanism are connected in parallel and are connected in series with two booster fans which are arranged in parallel; the second air feeder, the second induced draft fan and the second valve are all electrically connected with the control module;
when one of the two booster fans trips, the control module controls the second air feeder and the second induced draft fan to be completely powered off, and the control module controls all valves of the second combustion mechanism to be closed;
two when booster fan all trips, control module controls first forced draught blower, first draught fan, second forced draught blower and the whole outage of second draught fan, control module controls whole valves of first combustion mechanism and second combustion mechanism are closed.
In a possible implementation manner, the air inlet and the air outlet of each induced draft fan and the air inlet and the air outlet of each booster fan are respectively provided with a third valve, and the third valves are electrically connected with the control module;
and when one of the induced draft fan or the booster fan trips, the control module controls the corresponding third valve to close.
In the embodiment of the application, the first air feeder, the first induced draft fan booster fan and the first valve are in linkage control, after one of the fans trips, the control module can control the on-off of the first air feeder, the first induced draft fan and the booster fan, so that the first air feeder, the first induced draft fan and the booster fan all work only one fan, and meanwhile, the control module can control the first valve of one group of first feeding pipes to be closed; after the wind power is reduced by half, the fuel entering the boiler is reduced by half, the smoke and wind balance in the boiler is kept, and the abnormal boiler shutdown caused by the tripping of a fan is reduced; when tripping operation is carried out on all the first air feeders, all the first draught fans are tripped or all the booster fans are tripped, the air inlet and the air outlet in the boiler can not reach balance through the working quantity of the control fans, therefore, the control module controls all the fans to be powered off, and controls all the first valves to be closed, so that the condition that the internal pressure of the boiler is too high and equipment is damaged can be avoided.
Compared with the prior art, the flue gas control system for boiler flue gas desulfurization provided by the invention has the advantages that through the cooperation of the first air supply mechanism, the first air inducing mechanism, the booster fan, the first combustion mechanism and the control module, when a single fan trips, the air inlet and the air outlet can be balanced by controlling the running number of the fans, and meanwhile, half of fuel is cut off, so that the produced flue gas and the air speed in the boiler can be balanced; when the first air feeder is tripped completely, the first induced draft fan is tripped completely or the booster fan is tripped completely, all the fans are closed and all fuel is cut off, so that the condition that equipment is damaged due to too high pressure in the boiler is avoided.
In order to achieve the purpose, the invention adopts another technical scheme that:
when a control module receives a tripping signal of one of two first air blowers, two first induced draft fans and two booster fans, the control module controls the two first air blowers, the two first induced draft fans and the two booster fans to be respectively closed, and the control module controls one group of first valves to be closed;
when the tripping signal of two first blowers, the tripping signal of two first draught fans or the tripping signal of two booster fans is received at the control module, the control module controls the two first blowers, the two first draught fans and the two booster fans to be closed, and the control module controls the two sets of first valves to be closed.
In one possible implementation, when one of the fans trips, the duct connected to that fan is closed and the fan is removed.
In one possible implementation, the sealing is performed at the open end of the duct after the blower is removed.
In one possible implementation, the duct connected to the fan is cooled before the fan is removed.
In one possible implementation, before the fan is dismantled, a water receiving container is arranged below the joint of the pipeline and the fan.
In one possible implementation mode, a water leakage pipe is arranged on a pipeline connected with the fan, and the water leakage pipe is communicated with the pipeline and is positioned below the pipeline; a fourth valve is arranged on the water leakage pipe; the water leakage pipe faces the water receiving container.
The beneficial effects of the flue gas control method for boiler flue gas desulfurization provided by the invention are the same as those of the flue gas control system for boiler flue gas desulfurization, and are not repeated herein.
Drawings
FIG. 1 is a schematic diagram of a flue gas control system for desulfurizing flue gas of a boiler according to an embodiment of the present invention;
fig. 2 is a schematic view of a water receiving container part of a flue gas control system for desulfurizing flue gas of a boiler according to an embodiment of the present invention.
Description of reference numerals: 1. a first air supply mechanism; 11. a first blower; 2. a first air inducing mechanism; 21 a first induced draft fan; 3. a booster fan; 4. a boiler; 41. a first combustion mechanism; 42. a second combustion mechanism; 5. a second air supply mechanism; 51. a second blower; 6. a second air inducing mechanism; 61. a second induced draft fan; 7. a desulfurizing tower; 8. a third valve; 9. a water receiving container; 91. a water leakage pipe; 92. and a fourth valve.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 and fig. 2 together, a flue gas control system for desulfurizing flue gas of a boiler according to the present invention will now be described. The flue gas control system for boiler flue gas desulfurization comprises a first air supply mechanism 1, a first air inducing mechanism 2, a supercharging mechanism, a first combustion mechanism 41 and a control module; the first air supply mechanism 1 comprises two first air supplies 11 which are arranged in parallel, and the two first air supplies 11 are suitable for being communicated with an air inlet of the boiler 4 after being connected in parallel; the first induced draft mechanism 2 comprises two first induced draft fans 21 which are arranged in parallel, and the two first induced draft fans 21 are suitable for being communicated with the air outlet of the boiler 4 after being connected in parallel; the supercharging mechanism comprises two supercharging fans 3 which are arranged in parallel; the two booster fans 3 are arranged in parallel through a pipeline; the two booster fans 3 are connected with the two first induced draft fans 21 in series through pipelines; the first combustion mechanism 41 comprises two groups of first feeding pipes which are suitable for being communicated with the boiler 4, and a first valve is arranged on each first feeding pipe; the control module is respectively electrically connected with the two first air blowers 11, the two first induced draft fans 21, the two booster fans 3 and the two first valves; when one of the two first blowers 11, the two first induced draft fans 21 and the two booster fans 3 trips, the control module controls the operation number of the first blowers 11, the first induced draft fans 21 and the booster fans 3 to be one, and the control module controls one group of first valves to be closed; when the first air blower 11 is tripped completely, the first induced draft fan 21 is tripped completely or the booster fan 3 is tripped completely, the control module controls the first air blower 11, the first induced draft fan 21 and the booster fan 3 to be powered off completely, and the control module controls the two sets of first valves to be closed.
In the embodiment of the application, the first blower 11, the first induced draft fan 21 and the booster fan 3 are in linkage control, after one of the blowers trips, the control module can control the on-off of the first blower 11, the first induced draft fan 21 and the booster fan 3, so that the first blower 11, the first induced draft fan 21 and the booster fan 3 all work only one, and meanwhile, the control module can control the first valve of one group of first feeding pipes to be closed; after the wind power is reduced by half, the fuel entering the boiler 4 is reduced by half, the smoke and wind balance in the boiler 4 is kept, and the abnormal shutdown caused by the tripping of a fan is reduced; when 11 total trips of first forced draught blower, the total trips of first draught fan 21 or the total trips of booster fan 3, the air inlet and the air-out in boiler 4 can't reach the equilibrium through the work quantity of control fan, consequently, control all fans outage through control module to control whole first valve and close, can avoid 4 internal pressure of boiler too high and the condition that equipment damaged appears.
Compared with the prior art, the flue gas control system for boiler flue gas desulfurization provided by the invention has the advantages that through the cooperation of the first air supply mechanism 1, the first air inducing mechanism 2, the booster fan 3, the first combustion mechanism 41 and the control module, when a single fan trips, the air inlet and the air outlet can be balanced by controlling the running number of the fans, and meanwhile, half of fuel is cut off, so that the produced flue gas and the air speed in the boiler 4 can be balanced; when the first blower 11 is tripped completely, the first induced draft fan 21 is tripped completely or the booster fan 3 is tripped completely, all the fans are turned off and all fuel is cut off, so that the situation that the pressure in the boiler 4 is too high and equipment is damaged is avoided.
It should be noted that each group of the first feeding pipes includes 4 feeding pipes, which are not limited to 4 feeding pipes, and may be other numbers.
In some embodiments, as shown in fig. 1 and 2, the flue gas control system further comprises a second air supply mechanism 5, a second air inducing mechanism 6 and a second combustion mechanism 42; the second air supply mechanism 5 comprises two second air supplies 51 arranged in parallel, and the two second air supplies 51 are suitable for being communicated with the air inlet of the second boiler 4 after being connected in parallel; the second induced draft mechanism 6 comprises two second induced draft fans 61 which are arranged in parallel, and the two second induced draft fans 61 are suitable for being communicated with the air outlet of the second boiler 4 after being connected in parallel; the second combustion means 42 comprise two sets of second feeding pipes suitable for communicating with the second boiler 4, on which second feeding pipes there are second valves; the first air inducing mechanism 2 and the second air inducing mechanism are connected in parallel and are connected in series with two booster fans 3 which are arranged in parallel; the second air blower 51, the second induced draft fan 61 and the second valve are electrically connected with the control module; when one of the two booster fans 3 trips, the control module controls the second blower 51 and the second induced draft fan 61 to be completely powered off, and the control module controls all valves of the second combustion mechanism 42 to be closed; when the two booster fans 3 are tripped, the control module controls all the first blower 11, the first induced draft fan 21, the second blower 51 and the second induced draft fan 61 to be powered off, and controls all the valves of the first combustion mechanism 41 and the second combustion mechanism 42 to be closed.
In the above scheme, when the two boilers 4 are working at the same time, the power main line of the desulfurizing tower 7 and the power main line of the first boiler 4 are the same power main line, that is, after the first boiler 4 is powered off, the desulfurizing tower 7 is also powered off; therefore, after one of the booster fans 3 trips, the wind power in the pipeline is reduced by half, so that the generation speed of the flue gas can be reduced by half by closing all the second blowers 51 and the second induced draft fans 61, and the balance of the flue gas and the wind is ensured; and after the second boiler 4 is powered off, because the first blower 11 and the first induced draft fan 21 normally operate, the desulfurizing tower 7 is not powered off, and can still normally operate.
After two booster fans 3 all trip, the flue gas in the pipeline can not be conveyed to the desulfurizing tower 7, so all fans on the first boiler 4 and the second boiler 4 are powered off, and all feeding pipes on the first boiler 4 and the second boiler 4 are closed, thereby avoiding the situation that the pressure in the boiler 4 is increased due to continuous generation of the flue gas, and reducing the damage of equipment.
In some embodiments, as shown in fig. 1 and fig. 2, the air inlet and the air outlet of each induced draft fan and the air inlet and the air outlet of each booster fan 3 are provided with a third valve 8, and the third valve 8 is electrically connected with the control module; when one of the induced draft fans or the booster fan 3 trips, the control module controls the corresponding third valve 8 to be closed; by closing the third valve 8 on the pipeline corresponding to the tripping fan, the smoke leaked from the pipeline is reduced when the fault fan is disassembled, so that the fault fan is convenient to maintain; the use of the boiler 4 is not influenced in the maintenance process of the fault fan; after the fault fan is maintained, the fault fan is installed, the corresponding third valve 8 is opened, the maintained fault fan is restarted, all fans are started, all feeding pipes are opened, and the boiler 4 can be restored to the initial working state.
Based on the same inventive concept, the embodiment of the present application further provides a control method, as shown in fig. 1 and fig. 2, when a control module receives a trip signal of one of two first blowers, two first induced draft fans and two booster fans, the control module controls the two first blowers, the two first induced draft fans and the two booster fans to be respectively closed, and the control module controls one group of first valves to be closed;
when the tripping signal of two first blowers, the tripping signal of two first draught fans or the tripping signal of two booster fans is received at the control module, the control module controls the two first blowers, the two first draught fans and the two booster fans to be closed, and the control module controls the two sets of first valves to be closed.
The beneficial effect of the control method provided by the invention is the same as that of the flue gas control system for boiler desulfurization, and the description is omitted here.
In some embodiments, as shown in fig. 1 and 2, when one of the fans trips, the duct connected to that fan is closed and the fan is removed; before the fan is dismantled, cooling a pipeline connected with the fan, and arranging a water receiving container 9 below the joint of the pipeline and the fan; a water leakage pipe 91 is arranged on the pipeline connected with the fan, and the water leakage pipe 91 is communicated with the pipeline and is positioned below the pipeline; a fourth valve 92 is arranged on the water leakage pipe 91; the water leakage pipe 91 faces the water receiving container 9; after the fan is dismantled, sealing the opening end of the pipeline; when cooling this pipeline, the outer wall winding of this pipeline has the cooling tube, through letting in heat transfer medium in to the cooling tube, can realize the heat exchange to this pipeline, and then can cool down this pipeline.
In the scheme, by closing the pipeline communicated with the fault fan, when the fault fan is dismounted, the smoke can be prevented from flowing out of the pipeline; before the failed fan is dismounted, the temperature of the pipeline is reduced, scalding of operators can be avoided, and the failed fan can be dismounted conveniently by the operators; after the flue gas is cooled, condensed water exists in the pipeline, and after the third valve 8 is closed and the fourth valve 92 is opened, the condensed water in the pipeline can enter the water receiving container 9 through the water leakage pipe 91, so that the accumulation of the condensed water in the pipeline can be reduced; after the fault fan is dismantled, the opening end of the pipeline is sealed through the sealing plug, and impurities entering the pipeline can be reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A flue gas control system for boiler flue gas desulfurization, comprising:
the first air supply mechanism comprises two first air supplies arranged in parallel, and the two first air supplies are suitable for being communicated with an air inlet of the boiler after being connected in parallel;
the first induced draft mechanism comprises two first induced draft fans which are arranged in parallel, and the two first induced draft fans are suitable for being communicated with the air outlet of the boiler after being connected in parallel;
the supercharging mechanism comprises two supercharging fans which are arranged in parallel; the two booster fans are connected with the two first induced draft fans in series through a pipeline;
the first combustion mechanism comprises two groups of first feeding pipes which are suitable for being communicated with the boiler, and a first valve is arranged on each first feeding pipe;
the control module is respectively and electrically connected with the two first air blowers, the two first induced draft fans, the two booster fans and the first valve;
when one of the two first air blowers, the two first induced draft fans and the two booster fans trips, the control module controls the operation quantity of the first air blowers, the first induced draft fans and the booster fans to be one, and the control module controls one group of first valves to be closed;
when tripping operation is carried out on all the first air blowers, tripping operation is carried out on all the first induced draft fans or tripping operation is carried out on all the booster fans, the control module controls all the first air blowers, the first induced draft fans and the booster fans to be powered off, and the control module controls two sets of first valves to be closed.
2. The flue gas control system for desulfurization of boiler flue gas according to claim 1, wherein the flue gas control system further comprises:
the second air supply mechanism comprises two second air supplies which are arranged in parallel, and the two second air supplies are suitable for being communicated with an air inlet of a second boiler after being connected in parallel;
the second induced draft mechanism comprises two second induced draft fans which are arranged in parallel, and the two second induced draft fans are suitable for being communicated with the air outlet of the second boiler after being connected in parallel;
the second combustion mechanism comprises two groups of second feeding pipes which are suitable for being communicated with a second boiler, and a second valve is arranged on each second feeding pipe;
the first air inducing mechanism and the second air inducing mechanism are connected in parallel and are connected in series with two booster fans which are arranged in parallel; the second air feeder, the second induced draft fan and the second valve are all electrically connected with the control module;
when one of the two booster fans trips, the control module controls the second air feeder and the second induced draft fan to be completely powered off, and the control module controls all valves of the second combustion mechanism to be closed;
two when booster fan all trips, control module controls first forced draught blower, first draught fan, second forced draught blower and the whole outage of second draught fan, control module controls whole valves of first combustion mechanism and second combustion mechanism are closed.
3. The flue gas control system for boiler flue gas desulfurization according to claim 1, wherein the air inlet and the air outlet of each first induced draft fan and the air inlet and the air outlet of each booster fan are provided with third valves, and the third valves are electrically connected with the control module;
when one of the first induced draft fans or the booster fan trips, the control module controls the corresponding third valve to be closed.
4. A control method of a flue gas control system for desulfurizing flue gas of a boiler according to any one of claims 1 to 3,
when the control module receives a tripping signal of one of the two first air blowers, the two first induced draft fans and the two booster fans, the control module controls the two first air blowers, the two first induced draft fans and the two booster fans to be respectively closed, and the control module controls one group of first valves to be closed;
when the tripping signal of two first blowers, the tripping signal of two first draught fans or the tripping signal of two booster fans is received at the control module, the control module controls the two first blowers, the two first draught fans and the two booster fans to be closed, and the control module controls the two sets of first valves to be closed.
5. The control method of claim 4, wherein when one of the fans is tripped, a duct connected to the fan is closed and the fan is removed.
6. A control method according to claim 5, wherein the duct is sealed at its open end after the fan has been removed.
7. The control method of claim 5, wherein the duct connected to the fan is cooled prior to removing the fan.
8. A control method as claimed in claim 7, wherein a water receiving container is provided below the connection of the pipe to the fan before the fan is removed.
9. The control method according to claim 8, wherein a water leakage pipe is provided on a pipe connected to the blower, the water leakage pipe being in communication with the pipe and being located below the pipe; a fourth valve is arranged on the water leakage pipe; the water leakage pipe faces the water receiving container.
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| CN202110939217.9A CN113758014A (en) | 2021-08-16 | 2021-08-16 | Flue gas control system and method for boiler flue gas desulfurization |
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| CN202110939217.9A CN113758014A (en) | 2021-08-16 | 2021-08-16 | Flue gas control system and method for boiler flue gas desulfurization |
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Application publication date: 20211207 |