CN110986065B - System for heating smoke by cooling air of slag drying machine and method for eliminating smoke plume - Google Patents
System for heating smoke by cooling air of slag drying machine and method for eliminating smoke plume Download PDFInfo
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- CN110986065B CN110986065B CN201911125532.7A CN201911125532A CN110986065B CN 110986065 B CN110986065 B CN 110986065B CN 201911125532 A CN201911125532 A CN 201911125532A CN 110986065 B CN110986065 B CN 110986065B
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- 239000002893 slag Substances 0.000 title claims abstract description 129
- 239000000779 smoke Substances 0.000 title claims abstract description 105
- 238000001035 drying Methods 0.000 title claims abstract description 75
- 238000001816 cooling Methods 0.000 title claims abstract description 46
- 238000010438 heat treatment Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000007789 sealing Methods 0.000 claims abstract description 143
- 239000003546 flue gas Substances 0.000 claims abstract description 133
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 127
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 31
- 239000010959 steel Substances 0.000 claims abstract description 31
- 239000013049 sediment Substances 0.000 claims description 45
- 238000002156 mixing Methods 0.000 claims description 38
- 230000000694 effects Effects 0.000 claims description 9
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 238000009792 diffusion process Methods 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 7
- 230000002411 adverse Effects 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 239000000428 dust Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 description 4
- 239000002918 waste heat Substances 0.000 description 4
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
- F23J1/06—Mechanically-operated devices, e.g. clinker pushers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J13/00—Fittings for chimneys or flues
- F23J13/04—Joints; Connections
-
- 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
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2213/00—Chimneys or flues
- F23J2213/20—Joints; Connections
- F23J2213/204—Sealing arrangements
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention relates to a system for heating flue gas by utilizing cooling air of a slag drying machine, which comprises the slag drying machine, wherein a conveying steel belt is arranged on the slag drying machine, a flue gas sealing device is arranged in the slag drying machine, the slag drying machine is divided into a front half part of the slag drying machine and a rear half part of the slag drying machine by the flue gas sealing device, the front half part of the slag drying machine is positioned below a boiler, the flue gas sealing device is communicated with a booster fan through a sealed flue gas conveying pipeline, and an air inlet of the booster fan is externally connected with purified flue gas. The invention also provides a method for eliminating smoke plume, which utilizes the hot air generated after the cold air of the slag dryer fully exchanges heat with the slag to improve the temperature of the discharged smoke, thereby eliminating the white smoke. The invention improves the operation safety of the equipment, reduces the equipment investment and simplifies the system.
Description
Technical Field
The invention relates to an energy-saving and environment-friendly flue gas emission heating device. Especially, relate to one kind through installing the sealing ring for dry sediment machine, will dry the sediment machine and keep apart into two parts that do not influence each other, abundant recycle does not participate in a large amount of dry sediment machine cooling air's of boiler burning heat and improves smoke temperature, improves the fume emission height, reduces the power plant and retrencies the low northern haze that causes of gas temperature behind the GGH, belongs to energy-concerving and environment-protective technical field.
Background
Due to history and objective reality, the pattern of the coal-electricity as the main force of power supply in China can not be changed in a short period, most of the active units adopt optimized wet desulphurization, namely GGH is eliminated, and smoke is discharged at low temperature. Especially, in winter, the ambient temperature is low, the more water drops condensed in the smoke are, the more obvious the phenomenon that the smoke tube emits white smoke is, and the longer the tail of the smoke tube is. With the increasingly strict environmental protection policy, the phenomenon that the chimney emits white smoke is treated everywhere, and power plants around cities are required to treat smoke plume and then discharge the smoke plume after reaching the standard.
The most common method for eliminating smoke plume comprises heating the smoke or condensing the smoke first and then heating the smoke, but the existing heating mode after condensation has the problems of huge volume of heat exchange equipment, high energy consumption and operation cost and the like, and the heat exchange equipment has severe operation environment and has the problems of blockage and corrosion.
Disclosure of Invention
The invention aims to provide a scheme for improving the temperature of exhaust smoke by directly mixing hot air with certain temperature into the exhaust smoke.
The technical scheme of the invention is as follows:
the utility model provides an utilize system of cooling air heating flue gas of sediment machine futilely, includes and does the sediment machine, it carries the steel band to be provided with on the sediment machine futilely, be provided with flue gas sealing device in the sediment machine futilely, flue gas sealing device will do the sediment machine and divide into sediment machine first half and sediment machine latter half two parts futilely, it is located the boiler below to do sediment machine first half, flue gas sealing device passes through horizontal admission pipeline intercommunication booster fan, booster fan's the external purification flue gas of air intake.
Preferably, the upper part of the rear half part of the slag drying machine is communicated with a hot air leading-out pipeline, the other end of the hot air leading-out pipeline is communicated with a settling chamber, a mixing chamber is arranged in the settling chamber, a flue gas nozzle is arranged on the mixing chamber, and a flue gas diffusion opening is arranged on the other side, opposite to the flue gas nozzle, of the mixing chamber;
the other side of the settling chamber, which is opposite to the smoke nozzle, is communicated with a primary clean smoke and hot air mixed discharge pipeline, and a secondary mixed discharge chamber of smoke at the outlet of a booster fan and smoke and hot air is arranged on the primary clean smoke and hot air mixed discharge pipeline; a chimney is arranged on the discharge outlet of the secondary mixing and discharging chamber of the flue gas and the hot air of the flue gas at the outlet of the booster fan;
the booster fan is communicated with the mixing chamber through a clean flue gas pipeline, and the booster fan is communicated with the outlet flue gas of the booster fan and the flue gas hot air secondary mixing discharge chamber through a clean flue gas discharge pipeline.
Preferably, the flue gas sealing device comprises an inner ring sealing ring and an outer ring sealing ring, the outer ring sealing ring is an adjustable outer ring sealing ring, the diameter of the sleeved sealing ring of the outer ring sealing ring is increased by stretching, and the air outlets of the inner ring sealing ring and the outer ring sealing ring are deviated to the movement direction of slag drying machine and blown out in the opposite direction of cooling air.
The smoke-tight sealing device is of a frame structure and comprises an outer ring sealing ring used for sealing the space between the chain steel belt of the slag drying machine and the shell of the slag drying machine and an inner ring sealing ring used for sealing the space between the upper chain steel belt and the lower chain steel belt.
The outer ring sealing ring is positioned on an adjustable sealing ring part on the steel belt, the adjustment is realized by stretching the sealing ring through a sleeving device of the sealing rings at two sides, a lifting connecting rod is arranged at the part, positioned on the steel belt, of the outer ring sealing ring, the connecting rod is of a bolt structure, the lifting of the sealing ring is lifted through a motor or a hand wheel, the upper shell of the sealing ring part of the slag drying machine is modified, a narrow rectangular opening is formed in the upper part of the upper shell, a closed convex shell is arranged at the upper part of the upper shell and is used for accommodating the outer ring sealing ring to be occupied when being lifted, and a bolt for lifting the sealing ring and a matched screw thread of the bolt are sleeved on the closed convex shell;
the sealing parts of the outer ring sealing rings, which are positioned on the two side surfaces of the chain, are of sleeved stretchable structures, so that the upper sealing ring can move upwards. When large slag is on the steel belt, the steel belt is prevented from being stuck to block the smooth passing of the front ash slag, and the sleeved sealing ring of the outer ring sealing ring enables the large slag to pass smoothly by upward stretching. Outer loop sealing ring is used for sealed upper and lower steel band and dry between the sediment machine both sides shell space, and the inner loop sealing ring divide into according to seal space's size and sealed effect and is no less than 2 rings's multiple ring structure, if the sealed effect of round inner ring is not good, increases inner ring quantity again, if the inner ring is the multiple ring, the overall arrangement is a ring cover ring structure overall arrangement, and the inner ring sealing ring air outlet all is partial to dry sediment machine slag direction of motion, blows off with the cooling air adverse direction, can follow effectual realization sealed effect.
Preferably, the mixing chamber, the flue gas nozzle arranged on the mixing chamber and the flue gas diffusion opening arranged on the other side of the mixing chamber opposite to the flue gas nozzle form a flue gas ejector, the flue gas ejector is further provided with an air suction pipe, the air suction pipe is positioned on one side of the flue gas nozzle, and the flue gas nozzle is arranged on the air suction pipe.
Preferably, an ash falling hopper is arranged below the settling chamber.
Preferably, the horizontal steam inlet pipeline and the clean flue gas pipeline are both provided with a flue gas pressure adjusting valve.
Preferably, the flue gas sealing device is arranged on the section of the slag conveying direction of the slag drying machine and the section of the overhead projection of the boiler, which is deviated to the slag conveying direction.
A method of eliminating smoke plume comprising the steps of:
ash residues burnt in a boiler fall into a residue drying machine and are conveyed backwards through a conveying steel belt, a smoke sealing device divides the residue drying machine into a front half part of the residue drying machine and a rear half part of the residue drying machine, sealing air is provided by a booster fan through a horizontal steam inlet pipeline, a smoke pressure adjusting valve is arranged on the horizontal steam inlet pipeline, the size of air quantity is adjusted, the smoke sealing device comprises an inner ring sealing ring and an outer ring sealing ring, the upper part and the lower part of the outer ring sealing ring are adjustable, the outer ring sealing ring is of a sleeved structure, the height is adjusted when large residues are encountered so that the large residues can pass through, the inner ring sealing ring is supported and fixed through the horizontal steam inlet pipeline, the air outlet of the inner ring sealing ring is a narrow and long strip-shaped air outlet arranged on a metal drum, the opening of the inner ring sealing ring is deviated to the rear half part of the residue drying machine, and the air outlet and cooling air of the dry residues are reversely blown out to reduce the influence on the front half part of the residue drying machine;
the cooling air only enters the boiler to participate in combustion, the quantity of the cooling air of the rear half part of the slag dryer can be increased due to the sealing device and the flue gas ejector, slag and the slag dryer part of the rear half part of the slag dryer are cooled to a lower temperature and then enter the settling chamber through the pipeline, ash is discharged into the ash hopper in the settling chamber, the dedusted hot air enters the outlet of the settling chamber, the flue gas ejector is arranged at the outlet, the working medium of the flue gas ejector is a part of clean flue gas introduced from the outlet of the booster fan, a certain negative pressure is generated through the flue gas ejector to drive the hot air to be mixed for the first time, the mixed flue gas is discharged into the secondary mixing discharge chamber of the outlet of the booster fan and the flue gas hot air after being mixed, and the other part of clean flue gas introduced by the clean flue gas discharge pipeline of the booster fan is fully subjected to heat exchange and then is discharged into the chimney.
The hot air comes from dry sediment machine cooling air, through the scheme of installing sealing device to dry sediment machine, can be effectual will dry the sediment machine space and divide into two parts, and the front portion only has a small amount of cooling arrangement's air to participate in the boiler burning, and rear portion cooling air does not get into furnace, can increase the supply of air, cools off hot sediment and equipment to lower temperature, and the waste heat of fully absorption sediment heats the desulfurization flue gas. The invention has low modification cost, obvious effect and small operation and maintenance amount, and the hot air is derived from the hot air after cooling the dry slag.
The invention provides a method for improving the smoke exhaust temperature by mixing hot air generated after cold air of a slag dryer and slag exchange heat fully and before entering a chimney by using the pulling force of a smoke ejector and the chimney, so as to eliminate white smoke. The invention comprises a dry slag extractor and a smoke sealing device, wherein the smoke sealing device is arranged on the dry slag extractor and is arranged on the section of the slag extractor in the slag conveying direction and the section of the boiler overlooking projection slightly deviated to the slag conveying direction, the smoke sealing device of the invention divides the space of the dry slag extractor into two parts by using smoke with certain pressure (the smoke is from the outlet of a booster fan to be guided into a pipeline, the pipeline is provided with a smoke pressure regulating valve which can regulate the pressure of the sealed smoke), the cooling air of the rear part of the dry slag extractor does not enter the boiler to participate in combustion, and finally the cooling hot air outside the boiler projection is guided into a chimney to heat the smoke-discharging clean smoke, the smoke sealing device comprises an inner ring and an outer ring, the outer ring seals the upper section, the lower section, the left section and the right section of a conveying steel belt of the slag drying machine, the inner ring seals the inner section of a conveying chain, and the inner rings can be designed into a plurality of inner rings according to the sealing effect until the front part and the rear part of the slag drying machine are effectively isolated. Because the smoke sealing device is arranged, the space in the slag drying machine furnace and the space outside the overlooking projection of the boiler are isolated, the slag in the space outside the overlooking projection of the boiler can be fully cooled to lower temperature by increasing the flow of cold air, the cooling air quantity is not limited by the excess air coefficient of the boiler, the slag is cooled by the maximum quantity, the waste heat and latent heat of the slag are fully absorbed, the hot air after heat exchange is introduced into the settling chamber for dedusting, the hot air after dedusting is introduced into the chimney and mixed with the purified low-temperature smoke to improve the smoke exhaust temperature, the power from the cold air entering the slag drying machine and the settling chamber to the chimney finally provides two sources, one source is the pulling force of the chimney, the other source is a smoke ejector, a pipeline is introduced from the outlet of a booster fan, and the clean smoke with certain pressure is introduced into the outlet pipeline of the hot air settling chamber (a primary clean smoke and hot air mixed discharge pipeline), the outlet of the clean flue gas pipeline is provided with a nozzle, and certain negative pressure zone is generated by nozzle jet flow to move hot air to enter the flue pipe, and the hot air is mixed with the clean flue gas and then discharged.
The invention has the beneficial effects that:
1) the invention is energy-saving and environment-friendly, and can fully utilize the residual heat of slag discharge to heat wet flue gas and eliminate smoke plume.
2) The smoke sealing device arranged on the slag drying machine can reduce air leakage of the boiler, and fully uses a large amount of cooled hot air, so that the efficiency of the boiler is improved, and the coal consumption is reduced.
3) The additional power consumption and energy consumption are not increased basically or are increased little, and the positive benefit is obtained compared with the obtained benefit.
4) The method has universality, provides a new concern and direction for energy conservation and consumption reduction, and can be expanded to most industrial and mining enterprises.
5) The slag can be cooled to a lower temperature, and the safe operation of the equipment is guaranteed.
The invention combines the reduction of air leakage at the bottom of the boiler and the elimination of residual heat and smoke plume of the recovered slag together, on one hand, the slag dryer is divided into two parts in a sealing mode, the two parts are basically not interfered with each other, a large amount of cooling air of the slag dryer does not participate in the combustion of the boiler, the disturbance to the boiler is reduced, the air leakage at the bottom of the boiler is reduced, the sealing air adopts purified clean smoke, a pipeline is led out from an outlet of a booster fan to provide sealing medium with certain pressure, although one part of the sealing smoke enters the boiler, the air quantity of the part is small, the oxygen content is lower, the part of the sealing smoke is not directly blown to the bottom of the boiler, and the influence on the boiler can be ignored. The part of the slag drying machine outside the furnace bottom can fully increase the amount of cooling air without considering the limitation of the excess air coefficient of the boiler, cool slag and equipment to lower temperature, fully absorb the waste heat of the slag to heat low-temperature desulfurization clean flue gas, and avoid white smoke from a chimney. Therefore, the low-cost operation of the smoke plume eliminating system is realized under the condition of not influencing the operation of the boiler, the efficiency of the boiler is improved, and the coal consumption is reduced. On the other hand, as the flue gas is heated by adopting a mode of directly mixing hot air, the problem of blockage of the flue gas heat exchanger caused by heating the flue gas by adopting a conventional flue gas heat exchanger is avoided, the equipment investment is reduced while the operation safety of the equipment is improved, and the system is simpler.
Drawings
FIG. 1 is a schematic flow diagram of a system;
FIG. 2 is a schematic structural view of a sealing device for separating a slag drying machine into two parts;
FIG. 3 is a schematic diagram of a flue gas ejector.
In the figure, 1-boiler, 2-front half part of slag dryer, 3-conveying steel belt, 4-flue gas sealing device, 41-inner ring sealing ring, 42-outer ring sealing ring, 43-sleeving device, 44-convex shell, 45-motor, 46-hand wheel, 5-cooling air of roller shell of slag dryer, 6-rear half part of slag dryer, 7-cooling air of roller of dry chain, 8-cooling air of slag, 9-booster fan, 10-flue gas cleaning pipeline, 11-ash falling bucket, 12-flue gas nozzle, 13-hot air leading-out pipeline, 14-mixing chamber, 15-settling chamber, 16-chimney, 17-booster fan outlet flue gas and flue gas hot air secondary mixing discharge chamber, 18-clean flue gas discharge pipeline, 19-horizontal steam inlet pipeline, 20-a primary clean flue gas and hot air mixed discharge pipeline, 21-a flue gas pressure adjusting valve, 26-a flue gas diffusion port and 27-an air suction pipe.
Detailed Description
The utility model provides an utilize system of cooling air heating flue gas of dry sediment machine, includes dry sediment machine, be provided with on the dry sediment machine and carry steel band 3, be provided with flue gas sealing device 4 in the dry sediment machine, flue gas sealing device 4 will dry the sediment machine and divide into dry sediment machine first half 2 and dry sediment machine latter half 6 two parts, dry sediment machine first half 2 and be located boiler 1 below, flue gas sealing device 4 passes through horizontal admission pipeline 19 intercommunication booster fan 9, the external purification flue gas of booster fan 9's air intake.
The upper part of the rear half part 6 of the slag drying machine is communicated with a hot air leading-out pipeline 13, the other end of the hot air leading-out pipeline 13 is communicated with a settling chamber 15, a mixing chamber 14 is arranged in the settling chamber 15, a flue gas nozzle 12 is arranged on the mixing chamber 14, and a flue gas diffusion opening 26 is arranged on the other side, opposite to the flue gas nozzle 12, of the mixing chamber 14;
the other side of the settling chamber 15 opposite to the smoke nozzle 12 is communicated with a primary clean smoke and hot air mixed discharge pipeline 20, and a booster fan outlet smoke and hot air secondary mixed discharge chamber 17 is arranged on the primary clean smoke and hot air mixed discharge pipeline 20; a smoke pipe 16 is arranged on the discharge outlet of the secondary mixing discharge chamber 17 of the smoke and the smoke hot air at the outlet of the booster fan;
the booster fan 9 is communicated with the mixing chamber 14 through a clean flue gas pipeline 10, and the booster fan 9 is communicated with a booster fan outlet flue gas and flue gas hot air secondary mixing discharge chamber 17 through a clean flue gas discharge pipeline 18.
The smoke-sealing device is of a frame structure and comprises an outer ring sealing ring 42 used for sealing the space between the chain steel belt of the slag drying machine and the shell of the slag drying machine and an inner ring sealing ring 41 used for sealing the space between the upper chain steel belt and the lower chain steel belt.
The mixing chamber 14, the flue gas nozzle 12 arranged on the mixing chamber and the flue gas diffusion opening 26 arranged on the other side of the mixing chamber 14 opposite to the flue gas nozzle 12 form a flue gas ejector, the flue gas ejector is further provided with an air suction pipe 27, the air suction pipe is positioned on one side of the flue gas nozzle 12, and the flue gas nozzle 12 is arranged on the air suction pipe 27.
An ash falling hopper 11 is arranged below the settling chamber 15.
The horizontal steam inlet pipeline 19 and the clean flue gas pipeline 10 are both provided with a flue gas pressure adjusting valve 21.
The flue gas sealing device 4 is arranged on the section of the slag conveying direction of the slag dryer and the section of the overlooking projection of the boiler 1, which is deviated to the slag conveying direction.
The outer ring sealing ring 42 is positioned on the adjustable sealing ring part on the steel belt, the adjustment is realized by stretching the sealing ring through the sleeving device 43 of the sealing rings at two sides, the part, positioned on the upper surface of the steel belt, of the outer ring sealing ring 42 is provided with a lifting connecting rod, the connecting rod is of a bolt structure, the lifting of the sealing ring is lifted through a motor 45 or a hand wheel, the slag drying machine is provided with an upper shell of the sealing ring part, the upper part of the upper shell is provided with a narrow rectangular opening, the upper part is provided with a closed convex shell 44 for accommodating the occupation when the outer ring sealing ring is lifted, and a bolt for lifting the sealing ring and a matched screw thread of the bolt are sleeved on the closed convex shell 44.
The sealing parts of the outer ring sealing rings 42 positioned on the two side surfaces of the chain are of sleeved stretchable structures; outer loop sealing ring 42 is used for sealed steel band and dry sediment machine both sides shell space from top to bottom, and inner ring sealing ring 41 divide into according to the size and the sealed effect of seal space and is no less than 2 rings, and the overall arrangement is a ring cover ring structure overall arrangement, and inner ring sealing ring 41, outer loop sealing ring 42 air outlet all are partial to dry sediment machine sediment motion direction, blow off with the cooling air adverse direction.
A method for systematically eliminating smoke plume, comprising the steps of:
ash residues combusted in a boiler 1 fall into a slag drying machine and are conveyed backwards through a conveying steel belt 3, a smoke sealing device 4 divides the slag drying machine into a front half part 2 of the slag drying machine and a rear half part 6 of the slag drying machine, sealing air is provided by a booster fan 9 through a horizontal steam inlet pipeline 19, the horizontal steam inlet pipeline 19 is provided with a smoke pressure adjusting valve 21 for adjusting the air quantity, the smoke sealing device comprises an inner ring sealing ring 41 and an outer ring sealing ring 42, two side parts 43 of the outer ring sealing ring are of an upper and a lower adjustable structure in a sleeved mode, when large slag is encountered, a motor 45 on a convex shell 44 of the slag drying machine shell positioned at the sealing ring part drives a screw rod to lift the height of the outer ring sealing ring so that the large slag passes through, the inner ring sealing ring 41 is supported and fixed through the horizontal steam inlet pipeline 19, an air outlet of the inner ring sealing ring 41 is a narrow and long strip-shaped air outlet formed in the rear half part of a metal drum, and the opening is deviated to the rear half part of the slag drying machine part 6, the air outlet and the dry slag cooling air are blown out in the reverse direction, so that the influence on the front half part 2 of the slag drying machine is reduced;
only cooling air for cooling the box body of the slag drying machine enters the boiler 1 to participate in combustion, and due to the sealing device 4 and the smoke ejector, the cooling air quantity of the rear half part 6 of the slag drying machine can be increased, the slag and the slag drying machine part of the rear half part 6 of the slag drying machine are cooled to lower temperature and then enter the settling chamber through the pipeline 13, the ash is discharged into an ash bucket 11 in the settling chamber, the hot air after dust removal enters the outlet of the settling chamber, a flue gas ejector is arranged at the outlet, the working medium of the flue gas ejector is a part of clean flue gas led from the outlet of a booster fan 9, the hot air is driven to be mixed for the first time by a certain negative pressure generated by the flue gas ejector, the mixed flue gas and the flue gas hot air are discharged into a secondary mixing and discharging chamber 17 of the booster fan outlet, and the other part of clean flue gas introduced by the booster fan 9 through a clean flue gas discharging pipeline 18 is fully mixed for the second time and then is fully subjected to heat exchange and discharged into a chimney 16.
The invention will be further described with reference to the following figures 1-3:
(1) the principle of the invention is that the GGH of a thermal power plant is high in operation cost and easy to block and corrode equipment, most of the existing wet desulphurization power plants operating in service are optimized and have no GGH, smoke is discharged at low temperature, the current environmental protection requirement is strict, the urban and peripheral thermal power plants have to eliminate 'white smoke', the most effective method for eliminating the white smoke is wet smoke heating, the most common method for eliminating smoke plume comprises heating the smoke or firstly condensing and heating the smoke, but the existing heating mode after condensation has the problems of huge volume of heat exchange equipment, high energy consumption, high operation cost and the like, and the heat exchange equipment has severe operation environment and has the problems of blocking and corrosion. The scheme is characterized in that smoke is directly mixed with hot air at a certain temperature to improve the smoke exhaust temperature, the scheme is low in modification cost, obvious in effect and small in operation and maintenance amount, the air is heated, and the air can be heated by waste heat of slag discharge at a certain rate. Sealed bad being divided into inner ring and outer loop, the outer loop is isolated about defeated sediment steel band and the hourglass wind of the annular cross section of dry sediment machine shell, and the outer loop is adjustable outer loop, can increase the internal diameter and satisfy passing through of sediment when meetting big sediment, the sealed suit sealing ring that designs into of outer loop can stretch and increase the diameter, the interior ring sealing ring air outlet is partial to dry sediment machine sediment direction of motion, blow off with the cooling air adverse direction, most cooling air does not get into the boiler, do not influence the air distribution and the burning of boiler, and sealed wind adopts the net flue gas of increase fan export to seal moreover. Therefore, the supply amount can be increased by cooling air which does not participate in boiler combustion, slag and slag drier equipment can be cooled to a lower temperature, and more residual slag heat is absorbed to heat the exhaust smoke temperature.
(2) The design of discharging fume increases certain suction force with the flue gas sprayer and takes out hot air admission flue gas and hot-air mixer, and on the one hand through the flue gas sprayer with more abundant of air and flue gas mixture, the homogeneity of increase heat transfer, on the other hand has increased the suction force of hot-air, has strengthened the heat transfer effect of hot-air and sediment, and the flue gas sprayer can adjust the pressure of spraying the flue gas through adjusting valve 22.
(3) The working process is as follows: ash residue after the burning falls into dry sediment machine 2 in boiler 1, carry 3 backward transports through dry sediment conveying steel band, dry sediment machine sealing ring divide into 2 and 6 two parts to dry sediment machine, the sealing ring divide into two parts of inner ring and outer loop, sealed wind is drawn forth the pipeline by booster fan 9 and is provided, booster fan inhales the clean flue gas of low temperature after the desulfurization by flue gas diffusion mouth 26, booster fan export pipeline is equipped with flue gas pressure mediation valve 21, can adjust the size of amount of wind, the outer loop is adjustable from top to bottom, for the suit structure, can adjust the height when meetting big sediment and make big sediment pass through, inner ring sealing ring 41 supports and fixes through horizontal admission pipeline 19. The inner and outer ring air outlets are narrow and long strip-shaped air outlets formed in the metal drum, the openings of the inner and outer ring air outlets are deviated to the rear half part 6 of the slag drying machine, and the air outlet and the dry slag cooling air are blown reversely to reduce the influence on the front half part 2 of the slag drying machine. Basically, the front half part 2 of the slag drying machine burns, only cooling air for cooling a box body of the slag drying machine enters a boiler to participate in combustion, the quantity of the cooling air of the rear half part 6 of the slag drying machine can be increased due to the sealing ring and the mixing chamber 14, the slag and the slag drying machine part of the rear half part 6 of the slag drying machine enter the settling chamber 15 through the pipeline 13 after being cooled to be lower in temperature, ash is discharged into the ash bucket 11 in the settling chamber 15, hot air after dust removal enters an outlet of the settling chamber 15, a smoke ejector is arranged at the outlet, a working medium of the smoke ejector is a part of clean smoke introduced from an outlet of a booster fan, certain negative pressure is generated through the smoke ejector to drive the hot air to carry out primary mixing, the mixed smoke is discharged into the smoke air mixing chamber 17 together and is fully subjected to heat exchange after being mixed with the other part of the clean smoke introduced from the booster fan, and then is discharged into a smoke tube.
Claims (7)
1. The system for heating the flue gas by utilizing the cooling air of the slag drying machine is characterized by comprising the slag drying machine, wherein a conveying steel belt (3) is arranged on the slag drying machine, a flue gas sealing device (4) is arranged in the slag drying machine, the slag drying machine is divided into a front half part (2) of the slag drying machine and a rear half part (6) of the slag drying machine by the flue gas sealing device (4), the front half part (2) of the slag drying machine is positioned below a boiler (1), the flue gas sealing device (4) is communicated with a booster fan (9) through a sealed flue gas conveying pipeline (19), and an air inlet of the booster fan (9) is externally connected with purified flue gas;
the upper part of the rear half part (6) of the slag drying machine is communicated with a hot air leading-out pipeline (13), the other end of the hot air leading-out pipeline (13) is communicated with a settling chamber (15), a mixing chamber (14) is arranged in the settling chamber (15), a flue gas nozzle (12) is arranged on the mixing chamber (14), and a flue gas diffusion opening (26) is arranged on the other side, opposite to the flue gas nozzle (12), of the mixing chamber (14);
the other side of the settling chamber (15) opposite to the smoke nozzle (12) is communicated with a primary clean smoke and hot air mixed discharge pipeline (20), and a booster fan outlet smoke and hot air secondary mixed discharge chamber (17) is arranged on the primary clean smoke and hot air mixed discharge pipeline (20); a smoke pipe (16) is arranged on the discharge outlet of the secondary mixing discharge chamber (17) of the smoke at the outlet of the booster fan and the hot air of the smoke;
the booster fan (9) is communicated with the mixing chamber (14) through a clean flue gas pipeline (10), and the booster fan (9) is communicated with a secondary mixing and discharging chamber (17) of flue gas and flue gas hot air at the outlet of the booster fan through a clean flue gas discharging pipeline (18);
the smoke-sealing device is of a frame structure and comprises an outer ring sealing ring (42) for sealing the space between the chain steel belt of the slag drying machine and the shell of the slag drying machine and an inner ring sealing ring (41) for sealing the space between the upper chain steel belt and the lower chain steel belt;
the outer ring sealing ring (42) is positioned on the adjustable sealing ring part on the steel belt, the adjustment is realized by drawing the sealing ring through a sleeving device (43) of the sealing rings at two sides, a lifting connecting rod is arranged at the part, positioned on the upper surface of the steel belt, of the outer ring sealing ring (42), the connecting rod is of a bolt structure, the lifting of the sealing ring is lifted through a motor (45) or a mounting hand wheel (46), an upper shell of the sealing ring part is arranged on a slag drying machine, a narrow rectangular opening is formed in the upper part of the upper shell, a closed raised shell (44) is arranged on the upper part of the upper shell and is occupied when the outer ring sealing ring is lifted, and a bolt for lifting the sealing ring and a matched screw thread of the bolt are sleeved on the closed raised shell (44).
2. The system for heating flue gas with cooling air of a slag dryer according to claim 1, characterized in that the mixing chamber (14), the flue gas nozzles (12) arranged on the mixing chamber and the flue gas diffusion openings (26) arranged on the mixing chamber (14) on the other side opposite to the flue gas nozzles (12) form a flue gas injector, and the flue gas injector is further provided with a suction pipe (27), the suction pipe (27) is located on one side of the flue gas nozzles (12), and the flue gas nozzles (12) are arranged on the suction pipe (27).
3. System for heating flue gases with cooling air of slag dryers according to claim 1, characterized in that a hopper (11) is placed under said settling chamber (15).
4. The system for heating flue gases by means of cooling air of a slag dryer according to claim 1, characterized in that the sealed flue gas duct (19) and the clean flue gas duct (10) are each provided with a flue gas pressure regulating valve (21).
5. The system for heating flue gases by means of cooling air of a slag dryer according to claim 1, characterized in that said flue gas sealing device (4) is arranged on a section of the slag dryer in the slag conveying direction offset to the slag conveying direction from the top view projection of the boiler (1).
6. The system for heating flue gas by utilizing cooling air of a slag drying machine according to claim 1, wherein the sealing parts of the outer ring sealing rings (42) at the two sides of the chain are of a sleeved stretchable structure; inner ring sealing ring (41) are used for sealed steel band and dry sediment machine both sides shell space from top to bottom, and inner ring sealing ring (41) divide into according to the size and the sealed effect of confined space and are no less than 2 rings, and the overall arrangement is a ring cover ring structure overall arrangement, and inner ring sealing ring (41), outer ring sealing ring (42) air outlet all are partial to and dry sediment machine sediment direction of motion, blow off with the cooling air adverse direction.
7. A method for eliminating smoke plume in a system, comprising the steps of:
ash residues after combustion in a boiler (1) fall into a slag drying machine and are conveyed backwards through a conveying steel belt (3), a flue gas sealing device (4) divides the slag drying machine into a front half part (2) of the slag drying machine and a rear half part (6) of the slag drying machine, sealing air is provided by a booster fan (9) through a horizontal steam inlet pipeline (19), a flue gas pressure regulating valve (21) is arranged in the horizontal steam inlet pipeline (19) to regulate the air quantity, the flue gas sealing device comprises an inner ring sealing ring (41) and an outer ring sealing ring (42), the two side parts of the outer ring sealing ring are sleeved with upper and lower adjustable structures, when large slag is encountered, the height of the outer ring sealing ring is increased through a hand wheel (46) or a motor on a raised shell (44) of the sealing ring position of a slag drying machine shell to enable the large slag to pass through, the inner ring sealing ring (41) is supported and fixed through the horizontal steam inlet pipeline (19), the air outlet of the inner ring sealing ring (41) is a narrow and long strip-shaped air outlet formed in a metal barrel, the opening of the air outlet is deviated to the rear half part (6) of the slag drying machine, and the air outlet and the dry slag cooling air are blown reversely to reduce the influence on the front half part (2) of the slag drying machine;
only cooling air for cooling the box body of the slag drying machine enters the boiler (1) to participate in combustion, the sealing device (4) and the flue gas injector increase the amount of the cooling air of the rear half part (6) of the slag drying machine, the slag and the slag drying machine part of the rear half part (6) of the slag drying machine are cooled to a lower temperature and then enter the settling chamber through the pipeline (13), the ash is discharged into an ash bucket (11) in the settling chamber, the hot air after dust removal enters an outlet of the settling chamber, a smoke ejector is arranged at the outlet, the working medium of the smoke ejector is a part of clean smoke led from the outlet of the booster fan (9), the hot air is driven to be mixed for the first time by generating a certain negative pressure through the smoke ejector, the mixed smoke is discharged into a secondary mixing discharge chamber (17) of the smoke and the hot air of the smoke at the outlet of the booster fan, and the other part of the clean smoke introduced by the booster fan (9) through a clean smoke discharge pipeline (18) is fully subjected to heat exchange and then discharged into a smoke tube (16).
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