CN104132354A - Cold slag cooling water circulation cooling water-saving system of scraping plate slag conveyor of thermal power plant scraping plate - Google Patents
Cold slag cooling water circulation cooling water-saving system of scraping plate slag conveyor of thermal power plant scraping plate Download PDFInfo
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- CN104132354A CN104132354A CN201410319565.6A CN201410319565A CN104132354A CN 104132354 A CN104132354 A CN 104132354A CN 201410319565 A CN201410319565 A CN 201410319565A CN 104132354 A CN104132354 A CN 104132354A
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Abstract
The invention provides a cold slag water circulation cooling water-saving system of a scraping plate slag conveyor of a thermal power plant. The cold slag water circulation cooling water-saving system comprises a slag conveyor slag-water separation portion, a slag slurry pond slag-water separation portion, a clear water circulation cooling portion, a cold water reuse adjustment portion and the like and is suitable for a wet type slag removal, especially for a system adopting the scraping plate slag conveyor to perform slag removal and provided with a power generating set, the system has the advantages of being small in occupied area, good in cooling effect, low in moving power, low in water consumption, good in slag cooling efficiency, high in automation degree, reliable in running and the like, and slag removal waste water zero discharging is achieved on the aspect of environmental protection.
Description
Technical field
The cold pulp water circulating cooling of a kind of thermal power plant submerged slag conveyor water-saving system that the present invention proposes, comprise the parts such as the separation of dragveyer pulp water, the separation of slag stock tank pulp water, clear water circulating cooling, cold water recycling adjusting, to be suitable for the system that wet slag removal particularly adopts the generating set setting of submerged slag conveyor slagging-off, this system have take up an area little, good cooling results, operate power is low, low, the cold slag of water consumption is effective, automaticity is high, the feature such as reliable, environmental protection aspect realizes slagging-off wastewater zero discharge, and practicality is stronger.Dragveyer slagging-off is one of several slagging-off modes of adopting of large electric power plant unit, extensively adopts.Traditional design, the direct outer row of cold pulp water or dry ash slurrying are arranged outward, and water power consumption consumption is large; Have most weak effects, the occupation of land of cyclic utilization system large, move the problems such as power consumption is high, automaticity is low, fault rate is high, the present invention is a kind of possibility addressing the above problem.
Background technology
Cooling tower is the contact that utilizes water and air, by the leave a kind of heat power equipment of extensive use of used heat of industrial generation of evaporation, its effect is by heat, matter exchange spills into atmosphere by the heat of high-temperature cooling water, thereby reduce the temperature of cooling water, cold water effect cardinal principle is that the air of dry (low enthalpy) is after the twitch of blower fan, from Inlet Network place, enter in cooling tower, the water water spraying system of damp and hot (high enthalpy) is spilled in tower, cold and hot two fluid streams are mixed contact in tower, when water droplet contacts with air, one side is due to the direct heat transfer of air and water, on the other hand because the partial pressure of water vapor official post hot fluid between two fluid streams partly evaporates, take away evaporation gasification latent heat, it is evaporation heat transfer, thereby reach the object of cooling, cooling tower has cold water formula and two kinds of principal modes of air-cooled type, these two kinds of cooling towers have again dividing of cooling stack and force ventilation.
The difference of cooling tower backwater and leaving water temperature is generally called cooling range, and it depends primarily on the wet-bulb temperature of surrounding air.The cold water effect of cooling tower is by the difference of leaving water temperature and air intake wet-bulb temperature or be called degree of preventing and approach value and weigh, and the variation of local wet-bulb temperature directly affects the cooling effect of cooling tower.Air cooling compressor is to utilize conduction to make air absorb heat to realize heat radiation, is mainly subject to the impact of air dry-bulb temperature.Because air dry-bulb temperature is higher, specific heat is little, and heat absorption capacity is limited, and cooling effectiveness is low.
The cooling tower loss water yield mainly comprises: evaporation loss, windage loss, blowdown loss.Evaporation capacity (WE) kg/h, cooling 10-15 ℃, WE is less than 2%; Windage loss drift ice amount (WD) kg/h according to the structure of cooling tower, the general drift ice amount of ventilation speed lower than 1%; About blowdown (WB) kg/h, lose, because systemic circulation is due to continuous evaporation, recirculated water is concentrated gradually, needs blowdown replacement fluid, still, when this system is cooling for cold pulp water, due to system feature, wet slag is strained after water still moisture 10% left and right, as long as unit operation slagging-off, just there is the moisture that is equivalent to the quantity of slag 10% to discharge with slag, so do not need to arrange specially blowdown.The moisturizing water yield (Δ L) kg/h equals above three additions, adds dragveyer cell body evaporation section, that is, and and Δ L=WE+WD+WB+ dragveyer cell body evaporation capacity.
Although dry slag disposal is applied in part power plant, but dragveyer is still the slag removal equipment that the reliability of extensive employing is higher, 55 ℃ of the general cold pulp water Temperature Setting of dragveyer high temperature, operation is higher than this temperature, dragveyer starts moisturizing, overflow water is arranged outward, wastes a large amount of water sources and causes environmental pollution; Part power plant overflow water enters water cooling pond sediment cold water, and pond floor space is large has improved cost of land and site environment is poor; Also have part power plant to adopt the application of the cold pulp water of unit circulating water, energy consumption, water have consumed height.
Summary of the invention
With the cold pulp water of the cooling slag removing system of cooling tower, realize and recycle the object of saving water and energy, cold pulp water has the feature concentrated high by rate, pH value is high, not segregative thin slag content is high, water temperature is high, adopt spray void tower as the cooling device of the cold pulp water of wet slag removal dragveyer, spray void tower reduces fouling and stops up, forced ventilation improves cooling effect, nozzle adopts the larger hollow cone ceramic nozzle of throat diameter, resistance to wears and improves the life-span.
Cold pulp water in submerged slag conveyor inside by plate isolation device with zigzag downflow weir mating reaction to realize pulp water one-level separated, cold pulp water flow to after slag stock tank, at slag stock tank flow velocity, reduce, under Action of Gravity Field, realize secondary separation, thin solid impurity particle is settled down to slag stock tank bottom, by slag stock pump, return to dragveyer, slag stock tank surface clear water in plate isolation device with more uniform flow velocity overflow to clear water reserviors, the separation of Multi-stage slag water has effectively improved the water quality that enters cooling device, reduce dregginess, guaranteed the reliable and stable operation of cooling device.
Dragveyer overflow water flows automatically to slag stock tank by water-head, and slag inclusion overflow water is after the further precipitation and separation clarification of slag stock tank, and clean water overflow overflow is from flowing to clear water reserviors; Cooling tower trickle is collected rear portion from flowing to dragveyer moisturizing, and redundance overflows back clear water reserviors circulating cooling, and one-level variable frequency pump is only established in whole systemic circulation, and energy consumption is low.
Set up the double three kinds of circulations of cold slag and cold water, outer shroud is the circulation of cold slag, and interior ring is non-is not slag separating cycle, cold water circulate (seeing accompanying drawing 2).
Accompanying drawing explanation
Fig. 1 is the cold pulp water circulating cooling water saving of submerged slag conveyor detailed system figure; Fig. 2 is that cold slag, slag are separated, cold water circulation theory schematic diagram.
the specific embodiment
Dragveyer overflow water flows automatically to slag stock tank by water-head Action of Gravity Field, slag stock tank is provided with slag stock pump, slag stock pump is regularly squeezed into the lime-ash that is greater than 1-5mm precipitating in slag stock tank in dragveyer upper shell, and dragveyer housing afterbody buffering, prevents that clinker water from breaking up the boiler slag removal collecting through dragveyer scraper plate.
Dragveyer housing is provided with anti-scour wall, plate isolation, downflow weir, prevents that pulp water is without initial gross separation overflow, and overflow water is through the filter screen of slag stock tank entrance, large slag interception, separated through slag stock tank natural sedimentation pulp water, supernatant enters clear water reserviors through plate isolation, guarantees that lime-ash does not enter clear water reserviors.
Clarified water pump draws water and boosts to cooling tower, and spraying and sprinkling evaporation is cooling, collects a water part and flows into dragveyer from bottom, and overflow portion is returned to clear water reserviors circulating cooling.
Clear water reserviors are provided with contactless liquid level gauge, with electronic water compensating valve interlocking, when water level is reduced to setting low water level, electronic water compensating valve is opened automatically, and clear water reserviors are carried out to moisturizing, when water level reaches setting high water level, electronic water compensating valve is closed automatically, stops clear water reserviors carrying out moisturizing.
Force ventilation is established without filler spray filled cooling tower in clear water reserviors top.
According to cold water temperature, regulate clarified water pump adjustment of rotational speed injection flow rate, and control ventilation blower start and stop, control water spray pressure and be no more than limit value.
Dragveyer inside is provided with water temperature, by recirculated water, the lime-ash in dragveyer is carried out coolingly when dragveyer normally moves, and to guarantee that water temperature is not higher than 60 ℃, according to dragveyer cell body water temperature, adjustment enters the dragveyer water yield.
While meeting the situations such as boiler soot-blowing quantity of slag increase when dragveyer, when the water temperature in dragveyer may increase over 60 ℃ in moment, temperature detection letter is controlled and is opened large cold water bypass door, supplements rapidly cooling water in dragveyer upper groove body, until water temperature is down to, is less than 60 ℃.
When dragveyer water level is lower than when setting value, electronic water compensating valve is opened automatically, and moisturizing is carried out in dragveyer inside, or starts moisturizing for system.
Water pump adopts without diversion self priming pump or pumped vacuum systems is set, raising system operation automatization level, and realization operation unmanned, system regulate, convenient throwing stopped.
Cooling tower equipment is selected, and considers water quality inferiority, high, the easy fouling of temperature, perishable, does not select crossing current tower, does not select packed tower, and selects water spray tower; Considering has not easily separated thin slag in clear water, and nozzle is selected silicon carbide ceramics nozzle, nozzle diameter 18mm, and general particle can not stop up; Consider that the hot and cold water temperature difference is large, select positive mechanical to ventilate, can stop transport winter; Addressing is away from air blower inlet; Consider that cold pulp water has certain corrosivity, cooling tower body is selected fiberglass (FRP) material.
designing and calculating,take certain 600MW unit as example (seeing accompanying drawing 1).
Water balance: the water consumption of dragveyer system comprises the water of cooled slag evaporation, the water that slag is taken away.The slag moisture content that general slag removing system possesses Automobile Transportation condition is 25%, and slag can be taken away the water of slag gross weight 25%, and when dragveyer normally moves, bed drain purge is about 10t/h, and lime-ash is taken away and is about 2.5t/h; Outer and the cooling tower water consumption of stove is about 3t/h; In order to maintain the balance of the water yield, can test and revise according to 5.5t/h, to guarantee that dragveyer normally moves.
Heat balance: slag removing system is realized after closed cycle, enters the heat of submerged slag conveyor cell body by mending the heat of cool water quantity temperature rise absorption, this three parts maintaining heat balance of heat that cooling column is taken away.In this balance, the cell body water temperature of dragveyer remain on 60 ℃ on the low side
Water balance, Heat balance calculation: the initial temperature of heat-obtaining slag is t'=850 ℃; The specific heat of slag: CZ=0.97kJ/(kg. ℃); Water specific heat: Cs=4.2 kJ/(kg. ℃); 32 ℃ of moisturizing temperature; 60 ℃ of the highest water temperatures
The heat that lime-ash distributes: boiler warm sludge release heat (850 ℃-60 ℃) * 0.97 kJ/(kg. ℃) * 1000kg * 10=7663000Kj
The heat that lime-ash water consumption is taken away: heat Qz=1000 * 5.5 * 4.2 that slag Cang Shui takes away * (60-32)=646800kJ
The heat that cooling tower is taken away: heat Qs=1000 * 150 * 4.2 * 15=9450000kJ that mechanical blowing cold belt is walked
According to theory, calculate, cooling tower select YJGWL-150P type industrial machine ventilation water cooling tower, during 28 ℃ of surrounding environment, cooling capacity 150 m3/h, 15 ℃ of cooling abilities.。
Electric power consumption is lower than 50KW/h, and the outer cribbing of ratio wastewater is economized electricity consumption water saving, and year water saving is more than approximately 300,000 tons.
Claims (5)
- The cold pulp water circulating cooling of 1.Yi Zhong thermal power plant submerged slag conveyor water-saving system, comprises the parts such as the separation of dragveyer pulp water, the separation of slag stock tank pulp water, clear water circulating cooling, cold water recycling adjusting, is applicable to wet slag removal system.
- 2. according to the cold pulp water circulating cooling of claim 1 Yi Zhong thermal power plant submerged slag conveyor water-saving system, it is characterized in that, with the cold pulp water of the cooling slag removing system of cooling tower, realize and recycle the object of saving water and energy, adopt spray void tower as the cooling device of the cold pulp water of wet slag removal dragveyer, spray void tower reduces fouling and stops up, forced ventilation improves cooling effect, and nozzle adopts the larger hollow cone ceramic nozzle of throat diameter, resistance to wears and improves the life-span.
- 3. according to the cold pulp water circulating cooling of claim 1 Yi Zhong thermal power plant submerged slag conveyor water-saving system, it is characterized in that, cold pulp water in submerged slag conveyor inside by plate isolation device with zigzag downflow weir mating reaction to realize pulp water one-level separated, cold pulp water flow to after slag stock tank, at slag stock tank flow velocity, reduce, under Action of Gravity Field, realize secondary separation, thin solid impurity particle is settled down to slag stock tank bottom, by slag stock pump, return to dragveyer, slag stock tank surface clear water in plate isolation device with more uniform flow velocity overflow to clear water reserviors, the separation of Multi-stage slag water has effectively improved the water quality that enters cooling device, reduced dregginess, guarantee the reliable and stable operation of cooling device.
- 4. according to the cold pulp water circulating cooling of claim 1 Yi Zhong thermal power plant submerged slag conveyor water-saving system, it is characterized in that, dragveyer overflow water flows automatically to slag stock tank by water-head, and slag inclusion overflow water is after the further precipitation and separation clarification of slag stock tank, and clean water overflow overflow is from flowing to clear water reserviors; Cooling tower trickle is collected rear portion from flowing to dragveyer moisturizing, and redundance overflows back clear water reserviors circulating cooling, and one-level variable frequency pump is only established in whole systemic circulation, and energy consumption is low.
- 5. according to the cold pulp water circulating cooling of claim 1 Yi Zhong thermal power plant submerged slag conveyor water-saving system, it is characterized in that, set up cold, pulp water is separated and the double three kinds of circulations of cold water, outer shroud is the circulation of cold slag, interior ring is non-not for slag separating cycle, cold water circulate.
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| CN201410319565.6A CN104132354A (en) | 2014-07-08 | 2014-07-08 | Cold slag cooling water circulation cooling water-saving system of scraping plate slag conveyor of thermal power plant scraping plate |
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| CN201410319565.6A CN104132354A (en) | 2014-07-08 | 2014-07-08 | Cold slag cooling water circulation cooling water-saving system of scraping plate slag conveyor of thermal power plant scraping plate |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105157046A (en) * | 2015-10-21 | 2015-12-16 | 中国电力工程顾问集团西南电力设计院有限公司 | Slag water overtemperature disposal system and control method |
| CN105627339A (en) * | 2016-03-16 | 2016-06-01 | 神华集团有限责任公司 | Cyclic deslagging system |
| CN107166413A (en) * | 2017-06-13 | 2017-09-15 | 北京新世翼节能环保科技股份有限公司 | Waste heat recovery pulp water cooling system |
| CN110580062A (en) * | 2019-08-20 | 2019-12-17 | 清远市拼果果环保科技有限公司 | Water level balance control method for wet scraper slag conveyor |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105157046A (en) * | 2015-10-21 | 2015-12-16 | 中国电力工程顾问集团西南电力设计院有限公司 | Slag water overtemperature disposal system and control method |
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| CN105627339A (en) * | 2016-03-16 | 2016-06-01 | 神华集团有限责任公司 | Cyclic deslagging system |
| CN105627339B (en) * | 2016-03-16 | 2019-10-15 | 神华集团有限责任公司 | Recycle slag removing system |
| CN107166413A (en) * | 2017-06-13 | 2017-09-15 | 北京新世翼节能环保科技股份有限公司 | Waste heat recovery pulp water cooling system |
| CN110580062A (en) * | 2019-08-20 | 2019-12-17 | 清远市拼果果环保科技有限公司 | Water level balance control method for wet scraper slag conveyor |
| CN110580062B (en) * | 2019-08-20 | 2022-07-05 | 刘雨嫣 | Water level balance control method for wet scraper slag conveyor |
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Application publication date: 20141105 |
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