CN112413617B - Scraper type dehydration and deslagging system suitable for thermal power plant - Google Patents
Scraper type dehydration and deslagging system suitable for thermal power plant Download PDFInfo
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- CN112413617B CN112413617B CN202011315160.7A CN202011315160A CN112413617B CN 112413617 B CN112413617 B CN 112413617B CN 202011315160 A CN202011315160 A CN 202011315160A CN 112413617 B CN112413617 B CN 112413617B
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- slag
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- 230000018044 dehydration Effects 0.000 title claims abstract description 18
- 238000006297 dehydration reaction Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 151
- 239000002893 slag Substances 0.000 claims abstract description 124
- 230000009194 climbing Effects 0.000 claims abstract description 25
- 230000001502 supplementing effect Effects 0.000 claims abstract description 9
- 238000007789 sealing Methods 0.000 claims abstract description 5
- 238000011010 flushing procedure Methods 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000013589 supplement Substances 0.000 claims description 7
- 239000003245 coal Substances 0.000 claims description 6
- 239000010865 sewage Substances 0.000 claims description 5
- 230000017525 heat dissipation Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000002351 wastewater Substances 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 2
- 238000009833 condensation Methods 0.000 abstract description 4
- 230000005494 condensation Effects 0.000 abstract description 4
- 239000002918 waste heat Substances 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 2
- 239000008235 industrial water Substances 0.000 description 2
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
- F23J1/06—Mechanically-operated devices, e.g. clinker pushers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gasification And Melting Of Waste (AREA)
Abstract
The invention discloses a scraper type dehydration and deslagging system suitable for a thermal power plant, which comprises an ash slag dehydration system, a scraper type slag conveyor and a water supplementing system, wherein the ash slag dehydration system comprises a slag well, a slag bin, an air inlet, a heat exchanger and a water collecting plate; the scraper type slag conveyor comprises a slag conveyor climbing way, and a sealing plate is arranged at the top of the slag conveyor climbing way, so that the slag conveyor climbing way becomes a part of a climbing way air loop of the slag conveyor; the water charging system comprises a water collecting plate. According to the invention, the compressed air is heated by utilizing the waste heat of the high-temperature ash at the outlet of the slag well, then the heated compressed air is sent into the slag bin to reduce the moisture content of the ash, and in addition, the wet and hot air is utilized to recover part of water when meeting condensation, so that the purposes of reducing the water consumption of a deslagging system, reducing the moisture content of discharged ash and reducing the environmental pollution caused by ash water leakage of a slag transport vehicle are finally realized.
Description
Technical Field
The invention belongs to the field of ash removal of thermal power generation, and particularly relates to a scraper type dehydration and slag removal system suitable for a thermal power plant.
Background
After pulverized coal in a thermal power plant is combusted, slag falls into a water tank of a slag conveyor through a slag well and a shutoff door, and ash slag with the temperature of 800 ℃ takes away a large amount of heat, so that local water in the water tank is boiled, and the water loss of a slag removal system is increased; secondly, in the traditional deslagging system, ash and slag rise on a climbing slope through a scraper, the water content of the ash and slag is reduced by utilizing gravity for draining, but the ash and slag entering a slag bin still contain a large amount of water, ash water leakage is caused when a slag transport vehicle is transported outside, the environment is polluted, and the water consumption of the deslagging system is increased. The prior power plant generally needs to use reuse water and industrial water to continuously supplement water to a deslagging system, and the water supplement amount of a 30 MW unit reaches 15 t/h.
Disclosure of Invention
The invention provides a scraper type dehydration and slag removal system suitable for a thermal power plant, which is characterized in that compressed air is heated by utilizing waste heat of high-temperature ash at an outlet of a slag well, then the heated compressed air is sent into a slag bin to reduce the moisture content of the ash, and in addition, part of water is recycled by utilizing wet and hot air when meeting condensation, so that the purposes of reducing the water consumption of the slag removal system, reducing the moisture content of discharged ash and reducing the environmental pollution caused by ash water leakage of a slag transport vehicle are finally realized.
The invention is realized by adopting the following technical scheme:
a scraper type dehydration and deslagging system suitable for a thermal power plant comprises an ash slag dehydration system, a scraper type slag conveyor and a water supplementing system; wherein, the ash residue dehydration system comprises a residue well, a residue bin, an air inlet, a heat exchanger and a water collecting plate;
the scraper type slag conveyor comprises a slag conveyor climbing way, and a sealing plate is arranged at the top of the slag conveyor climbing way, so that the slag conveyor climbing way becomes a part of a slag conveyor climbing way air loop;
the water replenishing system comprises a water collecting plate;
compressed air enters the ash dehydration system from a first compressed air inlet and is then heated at a slag outlet at the lower end of a slag well, the heated compressed air is conveyed to a second compressed air inlet on the slag bin from an outlet of a compressed air heating section and is then conveyed into the slag bin from an air inlet at a slight positive pressure, high-temperature compressed air takes away moisture in part of ash after flowing through the ash temporarily stored in the slag bin, the moisture content of the ash is reduced, then the compressed air flows through a climbing ramp air loop of a slag dragging machine, the moisture in the air is condensed when encountering cold, the condensed water is collected by a water collecting plate, and the rest of air is discharged into the atmosphere after flowing through a heat exchanger.
The invention has the further improvement that the scraper slag conveyor also comprises a driving device, a slag scraper transmission chain and a guide wheel; the slag scraper transmission chain is arranged on a climbing way of the slag conveyor through a guide wheel and drives the slag scraper transmission chain to rotate through a driving device.
The invention is further improved in that the scraper type slag conveyor also comprises a water tank arranged at the bottom of the climbing ramp of the slag conveyor.
The invention has the further improvement that the water supplementing system also comprises an overflow water pool, an overflow water pump, a water supplementing pipeline, a water tank overflow water pipeline and a sewage ditch; and the water supplement of the overflow water tank flows into the water tank through the overflow water pump, the water supplement pipeline and the heat exchanger, and then returns to the overflow water tank through the overflow water pipe of the water tank.
The water replenishing system is further improved in that the water replenishing system further comprises a chain flushing water pipeline which is used for conveying chain flushing water, the chain flushing water mainly comes from clear water collected by the water collecting plate, and consumption of a deslagging system to high-quality water of a power plant is reduced.
The invention has the further improvement that the heat exchanger bends the water replenishing pipeline into a snakelike pipeline at the compressed air outlet, so that the compressed air further encounters cold separation water when flowing through the pipeline, and the water loss of the deslagging system is reduced.
A further improvement of the invention is that the make-up water for the deslagging system is primarily coal-containing wastewater or reuse water from the sewer.
The invention has the further improvement that the compressed air is arranged outside the slag well in a heating section pipeline at the lower end of the slag well, the compressed air is heated through the heat dissipation capacity of the wall surface of the slag well, and the compressed air is better heated by properly adjusting the material and the heat preservation measure at the lower end of the slag well.
The invention has at least the following beneficial technical effects:
the scraper type dehydration and deslagging system suitable for the thermal power plant heats compressed air by utilizing the waste heat of high-temperature ash at the outlet of the slag well, then sends the heated compressed air into the slag bin to reduce the water content of the ash, and recovers part of water by utilizing the wet and hot air when meeting condensation, thereby finally achieving the purposes of reducing the water consumption of the deslagging system, reducing the water content of discharged ash and reducing the environmental pollution caused by ash water leakage of a slag transport vehicle.
Drawings
FIG. 1 is a schematic view of a scraper dewatering and deslagging system suitable for use in a thermal power plant;
in the figure: the device comprises a first compressed air inlet 1, a slag well 2, a compressed air heating section outlet 3, a heat exchanger 4, a chain flushing water pipeline 5, a slag dragging machine climbing way 6, a sealing plate 7, a water collecting plate 8, a driving device 9, a slag bin 10, an air inlet 11, a second compressed air inlet 12, a slag transport vehicle 13, a slag scraper transmission chain 14, a water tank 15, a guide wheel 16, a water replenishing pipeline 17, an overflow water pipeline 18, an overflow water pool 19, an overflow water pump 20 and a sewage ditch 21.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
Referring to fig. 1, the present invention provides a scraper type dewatering and slag removing system suitable for a thermal power plant, which is characterized by comprising an ash residue dewatering system, a scraper type slag conveyor and a water charging system.
The ash residue dehydration system comprises a slag well 2, a slag bin 10, an air inlet 11, a slag truck 13, a heat exchanger 4, a water collecting plate 8, a pipeline for conveying compressed air, a valve and the like; the system mainly utilizes the waste heat of high-temperature ash in the slag well 2 to heat the compressed air, thereby obtaining the high-temperature dry compressed air for dehumidifying the ash with larger water content in the slag bin 10.
The scraper slag conveyor comprises a driving device 9, a slag scraper transmission chain 14, a water tank 15 and a guide wheel 16; the sealing plate 7 is arranged at the top of the climbing ramp 6 of the slag conveyor, so that the humid air with higher temperature coming out of the top of the slag bin 10 can be condensed and dehydrated by enough distance on the longer climbing ramp 6 of the slag conveyor; the water supplementing system comprises an overflow water pool 19, an overflow water pump 20, a water supplementing pipeline 17, a chain flushing water pipeline 5, a heat exchanger 4, a water collecting plate 8, a water tank overflow water pipeline 18 and a sewage ditch 21.
The slag scraper transmission chain 14 is arranged on the slag conveyor climbing ramp 6 through a guide wheel 16, and the slag scraper transmission chain 14 is driven to rotate through a driving device 9. The water from the overflow water tank 19 flows into the water tank 15 through the overflow water pump 20, the water supply pipe 17 and the heat exchanger 4, and then returns to the overflow water tank 19 through the water tank overflow pipe 18. The chain flushing water pipeline 5 is used for conveying chain flushing water, the chain flushing water mainly comes from clear water collected by the water collecting plate 8, and consumption of a deslagging system on high-quality water of a power plant is reduced.
The compressed air is arranged outside the slag well in a heating section pipeline at the lower end of the slag well 2, the compressed air is heated through the heat dissipation capacity of the wall surface of the slag well, and the compressed air is better heated by properly adjusting the material at the lower end of the slag well and heat insulation measures.
Referring to fig. 1, compressed air enters an ash dehydration system from a compressed air inlet 1, then is heated at a slag outlet at the lower end of a slag well 2, the heated compressed air is conveyed to a compressed air inlet 12 on a slag bin 10 from an outlet 2 of a compressed air heating section, then is sent into the slag bin 10 from an air inlet 11 at a slight positive pressure, after the high-temperature compressed air flows through the ash which is temporarily stored in the slag bin 10, moisture in part of the ash is taken away, so that the moisture content of the ash is reduced by 5% -10%, then the compressed air flows through a climbing ramp air loop of a slag conveyor, the moisture in the air is condensed when the air is cooled, the condensed water is collected by a water collecting plate 8, and the rest of the air flows through a heat exchanger 4 and then is discharged into the atmosphere.
Referring to fig. 1, a heating section pipeline of compressed air at the lower end of a slag well 2 is arranged outside the slag well 2, the compressed air is heated through the heat dissipation capacity of the wall surface of the slag well 2, an ash descending channel in the slag well 2 cannot be blocked, and the cleaning of the compressed air heating section pipeline is avoided; the flow velocity at the compressed air inlet 1 in the system is 2m/s, and in consideration of the problems of compressed air heating and the heat conductivity of materials at the lower end of the slag well 2, a compressed air pipeline needs to be arranged inside heat-insulating materials at the lower end of the slag well 2 so as to heat the compressed air better.
Referring to fig. 1, the heat exchanger 4 of the invention is a gas-water heat exchanger formed by bending a water replenishing pipeline 17 into a serpentine pipeline at a compressed air outlet, so that compressed air flows through the pipeline and further separates out water when meeting cold, and the water loss of a deslagging system is reduced.
Referring to fig. 1, the water from the overflow water tank 19 to the water tank 14 flows into the dragveyer water tank 14 after passing through the heat exchanger 4, and then returns to the overflow water tank 19 through the dragveyer water tank overflow pipe, the water supplement of the slag removal system is mainly coal-containing wastewater or reuse water from the sewage ditch 21, the wall cold circulation water demand is also reduced due to the cooling effect of the compressed air on the slag well 2 outlet, and the part of the cooling water enters the power station circulation water system for reuse after being used.
Referring to fig. 1, a water collecting plate 8 is arranged in the vertical middle direction of a climbing ramp 6 of the slag conveyor and used for collecting clear water generated by condensation when wet air is subjected to slag drying and supplying the clear water for flushing. Because the yield of the wet coal slag of the thermal power station can reach more than 20t/h, the water content of the wet coal slag generally exceeds 50 percent, and the demand of chain flushing water is only below 1t/h, the clean water collected by the water collecting plate 8 can be used by the chain flushing water, and the consumption of a deslagging system on high-quality water of the power plant, such as water coming from a fire-fighting industrial water tank, is reduced.
Claims (3)
1. A scraper type dehydration and deslagging system suitable for a thermal power plant is characterized by comprising an ash slag dehydration system, a scraper type slag conveyor and a water supplementing system; wherein,
the ash residue dehydration system comprises a slag well (2), a slag bin (10), an air inlet (11), a heat exchanger (4) and a water collecting plate (8);
the scraper type slag conveyor comprises a slag conveyor climbing way (6), and a sealing plate (7) is arranged at the top of the slag conveyor climbing way (6), so that the slag conveyor climbing way (6) becomes a part of a slag conveyor climbing way air loop;
the water replenishing system comprises a water collecting plate (8);
compressed air enters the ash dehydration system from a first compressed air inlet (1), then is heated at a slag hole at the lower end of a slag well (2), the heated compressed air is conveyed to a second compressed air inlet (12) on the slag bin from an outlet (3) of a compressed air heating section, then is conveyed into the slag bin (10) from an air inlet (11) at a micro positive pressure, after the high-temperature compressed air flows through the ash temporarily stored in the slag bin, moisture in part of the ash is taken away, the moisture content of the ash is reduced, then the compressed air flows through an air loop of a climbing ramp of a slag conveyor, the moisture in the air is condensed when encountering cold, the condensed water is collected by a water collecting plate (8), and the rest of the air is discharged into the atmosphere after flowing through a heat exchanger (4);
the scraper type slag conveyor also comprises a driving device (9), a slag scraper transmission chain (14) and a guide wheel (16); the slag scraper transmission chain (14) is arranged on a climbing way (6) of the slag conveyor through a guide wheel (16) and drives the slag scraper transmission chain (14) to rotate through a driving device (9); the scraper slag conveyor also comprises a water tank (15) arranged at the bottom of the climbing ramp (6) of the slag conveyor;
the water supplementing system also comprises an overflow water pool (19), an overflow water pump (20), a water supplementing pipeline (17), a water tank overflow water pipeline (18), a chain flushing water pipeline (5) and a sewage ditch (21); the water supplement of the overflow water tank (19) flows into the water tank (15) after passing through the overflow water pump (20), the water supplement pipeline (17) and the heat exchanger (4), and then returns to the overflow water tank (19) through the water tank overflow water pipeline (18), the chain flushing water pipeline (5) is used for conveying chain flushing water, the chain flushing water mainly comes from clear water collected by the water collecting plate (8), and the consumption of a deslagging system on high-quality water of a power plant is reduced;
the heat exchanger (4) bends the water replenishing pipeline (17) into a snake-shaped pipeline at the compressed air outlet, so that the compressed air further encounters cold to separate out water when flowing through the snake-shaped pipeline, and the water loss of the deslagging system is reduced.
2. The scraper dewatering deslagging system that is suitable for use in a thermal power plant of claim 1, wherein the makeup water for the deslagging system is primarily coal-containing wastewater or reuse water from a sewer (21).
3. The scraper dewatering and deslagging system suitable for thermal power plants as recited in claim 1, characterized in that the compressed air is arranged outside the slag well in the heating section pipeline at the lower end of the slag well (2), the compressed air is heated by the heat dissipation capacity of the wall surface of the slag well, and the compressed air is better heated by properly adjusting the material and the heat preservation measures at the lower end of the slag well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011315160.7A CN112413617B (en) | 2020-11-20 | 2020-11-20 | Scraper type dehydration and deslagging system suitable for thermal power plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011315160.7A CN112413617B (en) | 2020-11-20 | 2020-11-20 | Scraper type dehydration and deslagging system suitable for thermal power plant |
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| CN112413617A CN112413617A (en) | 2021-02-26 |
| CN112413617B true CN112413617B (en) | 2022-09-27 |
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2020
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| CN112413617A (en) | 2021-02-26 |
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