CN203177196U - Desulphurization system of coal-fired boiler - Google Patents
Desulphurization system of coal-fired boiler Download PDFInfo
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- CN203177196U CN203177196U CN2013201750294U CN201320175029U CN203177196U CN 203177196 U CN203177196 U CN 203177196U CN 2013201750294 U CN2013201750294 U CN 2013201750294U CN 201320175029 U CN201320175029 U CN 201320175029U CN 203177196 U CN203177196 U CN 203177196U
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- heat exchanger
- flue gas
- absorption tower
- temperature
- desulphurization system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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Abstract
The utility model discloses a desulphurization system of a coal-fired boiler. The desulphurization system comprises an induced draft fan, a heat exchanger, an absorption tower and a chimney which are connected in sequence, wherein the induced draft fan is used for introducing high temperature smoke gas in the heat exchanger; the heat exchanger is used for utilizing low temperature smoke gas discharged out from the absorption tower to cool down the high temperature smoke gas entering the absorption tower; the absorption tower is used for performing desulphurization on the entered smoke gas and then discharging the smoke gas out from the chimney through the heat exchanger; a pipeline between the induced draft fan and the heat exchanger is provided with a bypass smoke channel for emergent smoke discharge when the desulphurization system is in failure; and the bypass smoke channel is sealed through a steel plate or a sealing layer made of insulating bricks. The bypass smoke channel of the original desulphurization system is sealed, and the control component of the bypass smoke channel is opened after the original failures are eliminated, so that the smoke gas is also discharged out from the absorption tower after the failures occur, normal desulphurization of the smoke gas is realized under the condition that the bypass smoke channel is cancelled in the existing desulphurization system, and normal work of the existing desulphurization system is ensured under the condition that corresponding structures are removed.
Description
Technical field
The utility model relates to the boiler flue gas purification field, is specifically related to a kind of system's bypass flue plugging structure that adopts the limestone-gypsum wet method to carry out desulfurization to flue gas.
Background technology
In thermal power plant, contain a large amount of sulfide in the flue gas that burning produces, if do not add being discharged in the atmosphere of processing, meeting severe contamination atmosphere, therefore there is strict regulation in China to sulfur content in the fume emission of boiler, the boiler of thermal power plant all is equipped with flue gas desulfur device at present, because the SO in the flue gas
2Come down to acid, therefore by can from flue gas, removing SO with suitable alkali substance reaction
2, the method for flue gas desulfurization has multiple, but alkaline matter commonly used is that (calcium oxide, Cao) and white lime (calcium hydroxide), this is because lime stone output is enriched, thereby relatively cheap, the SO in quick lime or white lime and the flue gas for lime stone (calcium carbonate), quick lime
2After reacting, can produce the mixture of a kind of sulphite and sulfate, this desulfurization method is limestone-gypsum wet desulphurization technology.As shown in Figure 1, the general work flow process of limestone-gypsum desulfur technology is that flue gas-air-introduced machine-heat exchanger-absorption tower-demister-heat exchanger-chimney is discharged.Wherein between air-introduced machine and heat exchanger, be provided with the bypass flue; the main effect of bypass flue is the pipeline that is discharged into atmosphere when going wrong (breaking down as air-introduced machine or absorption tower) in desulphurization system for flue gas is directly introduced chimney; sealed by by-pass damper at ordinary times; when breaking down or safeguard, then utilize the baffle plate sealing to enter the pipeline of heat exchanger; open by-pass damper again flue gas is directly discharged, thereby ensure that the safe and reliable operation of unit, protection desulfurizer are not damaged when accident condition.But along with improving constantly of national environmental standard, requirement to desulfurization operation is more and more stricter, this undressed fume emission form must be cancelled, and enters the scheme of atmosphere after must the handling through desulfurization of generation again, so coal-burning boiler desulfurization bypass flue will carry out shutoff or replacement.
After the cancellation of bypass flue, be to occur in heat exchanger or air preheater part as fault, high-temperature flue gas just can't be lowered the temperature so, high-temperature flue-gas behind the process heat exchanger is about 150 ℃, and the temperature that the absorption tower can be accepted is only at 60-80 ℃, if directly high-temperature flue gas is entered the absorption tower, then can the various device in the absorption tower be caused damage.
The utility model content
Cause environmental pollution problems at the direct exhaust of bypass flue in steam power plant's flue gas desulfurization device in the prior art, flue gas was passed through by the absorption tower when the utility model provided a kind of structure by independent control to make fault, not only avoided the direct exhaust emission environment of flue gas but also avoid high-temperature flue gas to destroy the desulphurization plant bypass flue plugging structure on absorption tower.Concrete scheme is as follows: a kind of desulphurization system of coal-burning boiler, comprise the air-introduced machine that connects successively, heat exchanger, absorption tower and chimney, wherein air-introduced machine is introduced heat exchanger with high-temperature flue gas, the low-temperature flue gas that heat exchanger utilizes the absorption tower to discharge is lowered the temperature to the high-temperature flue gas that enters the absorption tower, the absorption tower is carried out desulfurization to the flue gas that enters and is discharged by chimney by heat exchanger, the bypass flue that is used for urgent smoke evacuation when the pipeline between described air-introduced machine and the heat exchanger is provided with the desulphurization system fault, it is characterized in that the confining bed sealing that described bypass flue is made by steel plate or insulating brick.
Be the convenient state of understanding the bypass flue: described confining bed is provided with the peep hole of observing bypass flue state, and described peep hole is closed by the observation door seal of activity folding.
Temperature for flue gas under the convenient control different situations: the pipeline between described heat exchanger and the absorption tower is provided with cooling and spraying system, and the high-temperature flue gas outlet of described heat exchanger and the high-temperature flue gas import department on absorption tower are equipped with temperature element.
Be the accurately temperature of control flue gas: described cooling and spraying system has three grades and be spaced successively on pipeline between heat exchanger and the absorption tower.
Be the different temperatures of understanding flue gas in each stage: inside, described absorption tower is disposed with from the bottom to top and stores demister and the low-temperature flue gas outlet that aqueous vapor in the flue gas of back is reacted in also liquid storage tank, high-temperature flue gas import, the spray system of spraying reactant liquor, the removal of recycling reactant liquor, wherein the face that demister is relative with entering flue gas is provided with temperature element, described temperature element comprise three and each each other 120 degree be distributed in the circumference of demister.
For avoiding each parts to influence each other when the fault: described heat exchanger adopts different electric power systems respectively with liquid storage tank.
For alleviating the flue internal pressure: the pipeline between described air-introduced machine and the heat exchanger is provided with booster fan, and the pipeline between described air-introduced machine and the booster fan is provided with the explosion proof door that prevents local flue superpressure.
Protection flue for the maximum restriction: described explosion proof door has four roads.
The utility model seals the bypass flue of former desulphurization system, removes the control assembly of opening the bypass flue after the former fault, makes fault that the back flue gas take place and is also discharged by the absorption tower, has avoided not purifying flue gas to the pollution of atmosphere.The cooling and spraying system that utilize to increase does not enter in the absorption tower flue gas of temperature standard and lowers the temperature reaching, and has guaranteed the flue gas cool-down when cooling systems such as heat exchanger break down, and has avoided the infringement of high-temperature flue gas to the absorption tower.The temperature element that utilize to increase is monitored the temperature of flue gas everywhere, guarantees the normal operation of whole desulphurization system.Can remove smoke detonation and second-time burning of setting by explosion proof door brings pressure in the flue.Prevent that by confining bed sealing bypass flue flue gas is discharged in the atmosphere by the bypass flue, utilize peep hole can understand the closed state of bypass flue at any time.Can realize the output of different flue-gas temperatures by the cooling and spraying system of multistage setting, to utilize resource to greatest extent.By the electric power system of separate configurations, when being broken down in system, the periodic duty of the circulation of liquid storage tank and heat exchanger can also normally move, guarantee the desulfurization of flue gas, the flue gas of avoiding not having purification enters atmosphere by the absorption tower.The utility model under the situation of removing corresponding construction, has guaranteed the operate as normal of existing desulphurization system by increasing cooling system and to the transformation of circuit, having guaranteed that existing desulphurization system under the situation of cancellation bypass flue, realizes the normal desulfurization of flue gas.
Description of drawings
The structural representation of desulphurization system in Fig. 1 prior art;
Fig. 2 desulphurization system structural representation of the present utility model;
Label declaration in the accompanying drawing: 1-absorption tower, 2-heat exchanger, 3-air-introduced machine, 4-chimney, 5-baffle plate, 6-by-pass damper, 7-booster fan, 8-explosion proof door, 801-confining bed, 802-bypass flue, 9-cooling and spraying system, 10-temperature element.
The specific embodiment
As shown in Figure 2, the desulphurization system of coal-burning boiler of the present utility model, comprise the air-introduced machine 3 that connects successively, heat exchanger 2, absorption tower 1 and chimney 4, wherein air-introduced machine 3 is introduced heat exchanger 2 with high-temperature flue gas, the low-temperature flue gas that heat exchanger 2 utilizes absorption tower 1 to discharge is lowered the temperature to the high-temperature flue gas that enters absorption tower 1, the 1 pair of flue gas that enters in absorption tower carries out desulfurization and is discharged by chimney 4 by heat exchanger 2, the bypass flue 802 that is used for urgent smoke evacuation when the pipeline between described air-introduced machine 3 and the heat exchanger 2 is provided with the desulphurization system fault, confining bed 801 sealings that described bypass flue 802 is made by steel plate or insulating brick.
The utility model seals the bypass flue of former desulphurization system, in case system opens by-pass damper automatically and flue gas is discharged in the atmosphere during anti-avulsion sulphur system failure, enter atmosphere again after forcing flue gas to purify through the absorption tower, thereby reach the effect that prevents the smoke pollution environment.Adopt steel plate or refractory brick to make confining bed and can prevent that high-temperature flue gas from destroying confining bed.This programme is removed baffle plate and the corresponding control panel in the former flue collector simultaneously, to avoid system to close plate washer automatically when the fault by-pass damper opened, and the problem that causes flue gas to drain.Such scheme is applicable to the situation that heat exchanger is working properly.Be the convenient situation of grasping the bypass flue, the utility model confining bed is provided with the peep hole of observing bypass flue state, and described peep hole is closed by the observation door seal of activity folding.This programme is removed former by-pass damper and corresponding control appliance thereof, for detecting the shutoff situation at any time, the observation door that can movable open is set.
Such scheme is adapted to the situation that the heat transmission equipment of desulphurization system does not go wrong, this moment, high-temperature flue gas can just be entered the absorption tower after the cooling, can not cause damage to the absorption tower, but for preventing that the heat transmission equipment fault can not be to the phenomenon of cooling high-temperature fume, pipeline between the utility model heat exchanger and the absorption tower is provided with cooling and spraying system 9, and the high-temperature flue gas outlet of described heat exchanger 2 and the high-temperature flue gas import department on absorption tower are equipped with temperature element 10.High-temperature flue gas by the outlet of temperature element 10 heat exchanging devices detects, if temperature surpasses the temperature upper limit that stand on absorption tower 1, then starting 9 pairs of high-temperature flue gas of cooling and spraying system lowers the temperature, can understand the actual temperature of the high-temperature flue gas that enters the absorption tower by the temperature element of absorption tower high-temperature flue gas import department, not being inconsistent as temperature then can be by spray pattern or the intensity of control cooling and spraying system 9, with the temperature of further reduction high-temperature flue gas, till meeting the requirements.Be quantified controlling cooling and spraying system 9, cooling and spraying system 9 of the present utility model has three grades and be spaced successively on pipeline between heat exchanger 2 and the absorption tower 1.According to the temperature of temperature element 10 reaction, control one-level, secondary, three grades are worked respectively or simultaneously, reach the purpose of not only lowering the temperature but also not wasting resource.The cooling and spraying system 9 that increases newly is independently-powered system, its duty is foundation according to the temperature that temperature element is measured fully, when heat exchanger is working properly, when miscellaneous equipment breaks down (as boiler), the meeting of high-temperature flue gas can't be impacted the absorption tower by the heat exchanger cooling, and need not start cooling and spraying system this moment.Undesired or cooling-down effect does not reach when requiring as heat exchanger work, then the temperature actuated cooling and spraying system that can measure according to temperature element is further lowered the temperature to high-temperature flue gas, till the requirement that meets the absorption tower.
For preventing in the flue that detonation takes place or second-time burning destroys desulphurization system, pipeline between the utility model air-introduced machine 3 and the heat exchanger 2 is provided with booster fan 7, and the pipeline between described air-introduced machine 3 and the booster fan 7 is provided with the explosion proof door 8 that prevents local flue superpressure.Explosion proof door 8 can adopt existing turnover plate type explosion proof door or explosion membrane type explosion proof door.For further improving security, described explosion proof door 8 has four roads.Inside, absorption tower of the present utility model is disposed with from the bottom to top and stores demister and the low-temperature flue gas outlet that aqueous vapor in the flue gas of back is reacted in also liquid storage tank, high-temperature flue gas inlet port, the spray system of spraying reactant liquor, the removal of recycling reactant liquor, wherein the face that demister is relative with entering flue gas is provided with temperature element, described temperature element comprise three and each each other 120 degree be distributed in the circumference of demister.By being set at the demister place, temperature element can measure temperature through reacted flue gas, because reactant liquor with smoke reaction in also have certain cooling effect, the temperature of this moment also is not equal to the temperature of high-temperature flue gas import department, what obtain here is temperature to the low-temperature flue gas of cooling high-temperature fume in the heat exchanger, whether the heat exchange efficiency that can judge heat exchanger this moment by this temperature reaches requirement, when if this temperature can make the high-temperature flue gas in the heat exchanger drop in the acceptable scope of absorption tower, then can keep current state, as do not reach when requiring, then need to open or further improve the cooling ability of cooling and spraying system.The different operate as normal of equipment that cause other for avoiding certain equipment of desulphurization system to break down, heat exchanger of the present utility model adopts different electric power systems respectively with liquid storage tank.When heat exchanger is not worked like this, can replace by cooling and spraying system, and liquid storage tank primary circuit fault can be carried out work by emergency electric system, purify to guarantee that flue gas can access timely.
The utility model also needs to be equipped with corresponding management control when work, as:
1, the booster fan Trip Logic is optimized: when booster fan directions X vibration values greater than 7.1mm/s and Y-direction vibration values greater than 4mm/s or booster fan directions X vibration values greater than 4mm/s and Y-direction vibration values greater than 7.1mm/s, time-delay 2s;
When booster fan 1#, 2# grease pump all stop and the booster fan bearing temperature is higher than 100 ℃ or booster fan 1#, the 2# grease pump all stops and booster fan motor bearings temperature when being higher than 80 ℃, time-delay 10s;
2, to the optimization of slurry circulating pump Trip Logic: when slurry circulating pump motor bearings temperature is higher than 95 ℃ or slurry circulating pump bearing temperature and is higher than 80 ℃, the low oil pressure of slurry circulating pump reductor and oil pump tripping operation.The entrance Electrically operated gate is closed and is put signal in place and do not open signal simultaneously after slurry circulating pump starts, and delays time and jumps slurry circulating pump in 60 seconds.
3, to the optimization of booster fan movable vane control mode: when booster fan 1#, the arbitrary hydraulic oil pump operation of 2# hydraulic oil pump and low oil pressure signal send time-delay 10s, the action of block increase pressure fan movable vane; Booster fan 1#, when the 2# hydraulic oil pump all stops to delay time 30s, block increase pressure fan movable vane action.Booster fan operation and load are forbidden booster fan movable vane aperture is adjusted in below 20% during greater than 250MW; Movable vane standard-sized sheet behind the booster fan emergency stop valve trip, and keep and manually can not adjust the movable vane aperture in 100 seconds, unimpeded to keep flue, load down is kept unit operation, reduces the unplanned stoppage in transit of unit.The booster fan movable vane does not have influence to blower fan when 20% aperture starts, former movable vane aperture can be closed to be optimized for aperture and to be not more than 20%, needs the problem of stoppage in transit boiler to satisfy the underrun of unit band to start booster fan.
4, report to the police accordingly at the measurement result of each temperature element or point out, be specially: during 140 ℃ of the high-temperature flue gas inlet temperatures on absorption tower, and/or demister place inlet temperature is reported to the police when being higher than 60 ℃.
5, the interlocking of fault and cooling and spraying system:
(1), absorption tower high-temperature flue gas inlet temperature is higher than 100 ℃, connection opens absorption tower entrance one-level cooling and spraying system;
(2), absorption tower high-temperature flue gas inlet temperature is higher than 110 ℃, connection opens absorption tower entrance secondary cooling and spraying system;
(3), absorption tower high-temperature flue gas inlet temperature is higher than 120 ℃, connection opens three grades of cooling and spraying systems of absorption tower entrance;
(4), the demister entrance flue gas temperature is higher than 55 ℃ and opens one, two, three cooling and spraying system simultaneously;
(5), when the high-temperature flue gas exit gas temperature of heat exchanger is higher than 150 ℃, connection opens cooling and spraying system, to reduce the flue-gas temperature of absorption tower high-temperature flue gas import;
6, to the control of the interrelated logic of explosion proof door: when former flue gas pressures greater than 1600Pa (four get two), drive explosion proof door.
The above only is preferred embodiment of the present utility model, be not that the utility model is done any pro forma restriction, though the utility model discloses as above with preferred embodiment, yet be not in order to limit the utility model, anyly be familiar with the technical staff of this patent in not breaking away from the technical solutions of the utility model scope, when the technology contents that can utilize above-mentioned prompting is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solutions of the utility model, any simple modification that foundation technical spirit of the present utility model is done above embodiment, equivalent variations and modification all still belong in the scope of the utility model scheme.
Claims (8)
1. the desulphurization system of a coal-burning boiler, comprise the air-introduced machine (3) that connects successively, heat exchanger (2), absorption tower (1) and chimney (4), wherein air-introduced machine (3) is introduced heat exchanger (2) with high-temperature flue gas, the low-temperature flue gas that heat exchanger (2) utilizes absorption tower (1) to discharge is lowered the temperature to the high-temperature flue gas that enters absorption tower (1), absorption tower (1) is carried out desulfurization to the flue gas that enters and is discharged by chimney (4) by heat exchanger (2), the bypass flue (802) that is used for urgent smoke evacuation when the pipeline between described air-introduced machine (3) and the heat exchanger (2) is provided with the desulphurization system fault, it is characterized in that confining bed (801) sealing that described bypass flue (802) is made by steel plate or insulating brick.
2. the desulphurization system of a kind of coal-burning boiler as claimed in claim 1 is characterized in that, described confining bed (801) is provided with the peep hole of observing bypass flue (802) state, and described peep hole is closed by the observation door seal of activity folding.
3. the desulphurization system of a kind of coal-burning boiler as claimed in claim 1, it is characterized in that, pipeline between described heat exchanger (2) and absorption tower (1) is provided with cooling and spraying system (9), and the high-temperature flue gas outlet of described heat exchanger (2) and the high-temperature flue gas import department of absorption tower (1) are equipped with temperature element (10).
4. the desulphurization system of a kind of coal-burning boiler as claimed in claim 3 is characterized in that, described cooling and spraying system (9) has three grades and be spaced successively on pipeline between heat exchanger (2) and absorption tower (1).
5. the desulphurization system of a kind of coal-burning boiler as claimed in claim 4, it is characterized in that, inside, described absorption tower (1) is disposed with from the bottom to top and stores demister and the low-temperature flue gas outlet that aqueous vapor in the flue gas of back is reacted in also liquid storage tank, high-temperature flue gas import, the spray system of spraying reactant liquor, the removal of recycling reactant liquor, wherein the face that demister is relative with entering flue gas is provided with temperature element, described temperature element comprise three and each each other 120 degree be distributed in the circumference of demister.
6. the desulphurization system of a kind of coal-burning boiler as claimed in claim 5 is characterized in that, described heat exchanger (2) adopts different electric power systems respectively with liquid storage tank.
7. the desulphurization system of a kind of coal-burning boiler as claimed in claim 1, it is characterized in that, pipeline between described air-introduced machine (3) and the heat exchanger (2) is provided with booster fan (7), and the pipeline between described air-introduced machine (3) and the booster fan (7) is provided with the explosion proof door (8) that prevents local flue superpressure.
8. the desulphurization system of a kind of coal-burning boiler as claimed in claim 7 is characterized in that, described explosion proof door (8) has four roads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201750294U CN203177196U (en) | 2013-04-10 | 2013-04-10 | Desulphurization system of coal-fired boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201750294U CN203177196U (en) | 2013-04-10 | 2013-04-10 | Desulphurization system of coal-fired boiler |
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| CN203177196U true CN203177196U (en) | 2013-09-04 |
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| CN2013201750294U Expired - Fee Related CN203177196U (en) | 2013-04-10 | 2013-04-10 | Desulphurization system of coal-fired boiler |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108211748A (en) * | 2018-03-27 | 2018-06-29 | 陕西大秦环境科技有限公司 | A kind of desulfurization white-smoke-removing device and technique |
| CN110038419A (en) * | 2019-05-22 | 2019-07-23 | 武汉武泵泵业制造有限公司 | A kind of device and method applied to flue gas desulphurization |
| CN113230873A (en) * | 2021-06-16 | 2021-08-10 | 深圳市格瑞斯达科技有限公司 | Desulfurization and denitrification equipment |
-
2013
- 2013-04-10 CN CN2013201750294U patent/CN203177196U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108211748A (en) * | 2018-03-27 | 2018-06-29 | 陕西大秦环境科技有限公司 | A kind of desulfurization white-smoke-removing device and technique |
| CN110038419A (en) * | 2019-05-22 | 2019-07-23 | 武汉武泵泵业制造有限公司 | A kind of device and method applied to flue gas desulphurization |
| CN113230873A (en) * | 2021-06-16 | 2021-08-10 | 深圳市格瑞斯达科技有限公司 | Desulfurization and denitrification equipment |
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| CF01 | Termination of patent right due to non-payment of annual fee |