CN202938324U - Pulverized coal fired boiler air-water-joint cooling drying slag discharging system - Google Patents

Pulverized coal fired boiler air-water-joint cooling drying slag discharging system Download PDF

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Publication number
CN202938324U
CN202938324U CN 201220686953 CN201220686953U CN202938324U CN 202938324 U CN202938324 U CN 202938324U CN 201220686953 CN201220686953 CN 201220686953 CN 201220686953 U CN201220686953 U CN 201220686953U CN 202938324 U CN202938324 U CN 202938324U
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slag
water
cooling
air
boiler
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冯斌
沈兵
林磊
卢国华
冯琰磊
梅飞虎
应祎平
冯丽敏
金剑勇
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China Power Engineering Consulting Group East China Electric Power Design Institute Co Ltd
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China Power Engineering Consulting Group East China Electric Power Design Institute Co Ltd
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Abstract

The utility model relates to a pulverized coal fired boiler air-water-joint cooling drying slag discharging system which comprises a slag well, attrition crushing equipment, an air-cooled type steel belt (chain plate) machine, a transitional slag hopper, a rotary cylinder type slag cooler and a cooling water system. Slag of a boiler enters the air-cooled type steel belt (chain plate) machine to conduct precooling through the slag well and the attrition crushing equipment, the slag after pre-cooled enters the rotary cylinder slag cooler through the transitional slag hopper to conduct further cooling, and hot air after heated by the slag enters a boiler hearth to participate in burning. Cooling water of the rotary cylinder slag cooler can come from condensation water of a power station or other systems, and the cooling water after heated by the slag returns to a hot power system of the power station. The pulverized coal fired boiler air-water-joint cooling drying slag discharging system solves the problem that air quantity in a drying slag discharging system is hard to control so as to generate a side effect on burning of the boiler, can recycle waste heat contained in the slag, improves efficiency of a unit, and reduces coal consumption of power generation.

Description

The wind and water combined cooling dried dreg removing system of a kind of pulverized-coal fired boiler
Technical field
The utility model relates to thermal power generation, is specifically related to the boiler slag cooling system in the thermal power plant.
Background technology
For the mechanical deslagging system of thermal power plant pulverized-coal fired boiler, mainstream technology both domestic and external is divided into two kinds, and the first adopts wet type submerged slag conveyor slag removing system, and it two is the dried dreg removing systems that adopt air-cooled steel band (carrier bar) machine.
Fig. 1 illustrates system's composition diagram of existing a kind of typical submerged slag conveyor wet slag removal system.As shown in Figure 1, the equipment of submerged slag conveyor wet slag removal system mainly by water immersion type scraping board slag conveyor 2, dragveyer to the slag conveying equipment 3 in slag storehouse, slag storehouse 4, overflow pond 5, sedimentation basin or high-efficiency concentrator 6, buffering pond 7 and relevant cold pulp water pump 8, flush water pump 9, dredge pump 10, slag system small pump etc. form.Slag falls into submerged slag conveyor top tank from boiler 1 slag notch, slag well, after the water cooling cracking in tank, is delivered to slag storehouse 4 by submerged slag conveyor 2, is transported by automobile or other mechanical system.
Submerged slag conveyor overflow water and slag storehouse bleed by raceway groove (pipeline) introduce be arranged near submerged slag conveyor overflow pond 5 in, be delivered to sedimentation basin 6(or high-efficiency concentrator by the overflow water pump) carry out clarifying treatment.Collect in set buffering pond 7 in by system through the water of precipitation process, as the water source of slag system, by the cold pulp water pump 8 and the flush water pump 9 that configure in system, be transmitted back to the slag systemic circulation and use.
The major advantage of wet slag removal system is to adopt water as cooling medium, and high temperature furnace slag carries out cracking in the tank of submerged slag conveyor, and the cooled temperature of slag is lower, can more efficiently decompose the slag of bulk.Its major defect is: power consumption is large, and huge afterheat of slags can't utilize, and operation water consumption is larger, and water system is complicated; Moisture evaporation in the lower furnace portion cell body absorbs the heat of burner hearth, discharges the loss of waste portion of energy with flue gas.In addition, contain slag granules in the medium that is transferred in the water circulation system of wet slag removal system, thus transh pump (slag pump) mostly selected, and pulp water has corrosivity and easy dirt, makes investment and operation and maintenance cost relatively high.Except the configuration various pumps, also configured thickener and buffered water pond in the system of water circulation, system is more complicated, and floor space is large, and the trouble point is many.
Fig. 2 illustrates system's composition diagram of the dried dreg removing system of existing a kind of typical air-cooled steel band (carrier bar) machine.As shown in Figure 2, the dried dreg removing system of air-cooled steel band (carrier bar) machine mainly is comprised of hearth deslagging device 11, the cold slag machine 12 of air-cooled steel band (carrier bar), slag crusher 13, slag storehouse 14 etc.Slag is from boiler 1 slag notch, slag well, and hydraulic shutoff door is fallen on conveying steel belt through after the precrushing of extrusion head.Head and the side of the cold slag machine 12 of steel band are typically provided with a plurality of air ports, a certain amount of surrounding air by pressure fan from steel band machine 12 heads and the air port, side is reverse enters, cooled slag and conveying steel belt, make lime-ash and conveyer belt cooling in, air absorbs boiler radiant heat and lime-ash sensible heat, and air themperature raises and is inhaled into the burner hearth that is in negative pressure state.Slag is completed cooling through slag extractor, and delivers into slag crusher and be broken, and enters slag storehouse 14 by induction system (machinery or Pneumatic System), is transported by automobile or other mechanical system.
The major advantage of the dried dreg removing system of air-cooled steel band (carrier bar) machine is not water consumption of system, does not produce waste water, the burner hearth EAT〉300 ℃ times, recovery afterheat of slags that can be to a certain degree, the energy consumption of system is lower.Its major defect is that the important operational factor of system is wayward, the off-design value is more, as the air capacity of cooled slag higher than the total intake of 1%~1.5% boiler, increased the excess air coefficient α of burning, the furnace flame center is because the bottom air enters, move on height, increased exhaust gas temperature, reduced boiler efficiency, the impact that therefore may have side effects to boiler combustion, when the quantity of slag was large, a large amount of cooling-airs entered boiler, increase the flow of boiler induced-draft fan, increased power consumption.In addition, the cooling employing air natural of dry bottom ash handling system slag is cooling, and cooling effect is relatively poor, the piece slag is difficult for cold, not strong to the adaptability of boiler slag quantitative change.Its system in the characteristics of real project using is, boiler efficiency is improved, and the cooling effect of slag is just poor; Make cooling of furnace slag effective, boiler efficiency will descend.According to introducing in the literary composition of Jiangsu Prov. Power Design Inst model benevolence east " test and the analysis of air cooling dry dreg removing system on the boiler efficiency impact ", dried dreg removing system will be in the situation that the large quantity of slag will make the efficiency of furnace descend 0.3%~0.5%.
The utility model content
The purpose of this utility model is that what to solve is that in dried dreg removing system, air quantity is difficult to control, and on the boiler combustion problem of impact that has side effects, and recycles the contained waste heat of slag, improves unit efficiency, reduces gross coal consumption rate.
For achieving the above object, the utility model provides a kind of pulverized-coal fired boiler wind and water combined cooling dried dreg removing system, it is characterized in that, comprise: slag well, attrition crushing equipment, air-cooled steel band machine, transition slag bucket, rolling-cylinder type slag-cooler and cooling water system, laggard to enter air-cooled steel band machine pre-cooled through slag well and attrition crushing equipment from the slag of boiler, and it is further cooling that the slag after pre-cooled enters rolling-cylinder type slag-cooler via the transition slag bucket.
In one preferred embodiment, described dreg removing system also comprises slag crusher, conveying device and slag storehouse, via crusher in crushing, then is delivered to the slag storehouse via conveying device through the cooled slag of rolling-cylinder type slag-cooler.
In another preferred embodiment, described dreg removing system also comprises the emergency shower device, and described emergency shower device is arranged on slag down-hole section.
In another preferred embodiment, the cooling water in described cooling water system turns back to the therrmodynamic system in power plant from the condensate system in power plant after cooling water is heated by slag.
Preferably, conveying device comprises bucket chain conveyor and bucket elevator, and cooled slag is successively through being transported to the slag storehouse after described bucket chain conveyor and described bucket elevator.
Preferably, turn back to certain one-level low-pressure heater or the oxygen-eliminating device in power plant after cooling water is heated by slag.
Dried dreg removing system of the present utility model is by adopting wind and water combined secondary cooling, and the heat of first order recovery section slag has reduced the incomplete combustion loss of boiler, has improved boiler efficiency.The afterheat of slags that reclaim the second level has been got back to the boiler circuit acting, has reduced the coal consumption of unit.In addition, system of the present utility model is to the coal of boiler and the load variations strong adaptability of unit, circulate without pulp water, the hot blast of controlled amounts advances boiler combustion and plays positive interaction, reclaimed the waste heat of slag when improving boiler efficiency, rolling-cylinder type slag-cooler second level indirect water-cooling, the waste heat that absorbs enters the acting of steam turbine system, in the situation that the constant generated energy that increases steam turbine generator of generating set coal consumption amount, in like manner, in the situation that the steam turbine generator generated energy is constant, can save the fuel consumption of generating set.And, zero water consumption also, low power consumption will be far superior to traditional submerged slag conveyor wet slag removal system and the dried dreg removing system of air-cooled steel band (carrier bar) machine to performance and the effect of afterheat of slags utilization.
Description of drawings
Fig. 1 illustrates system's composition diagram of existing a kind of typical submerged slag conveyor wet slag removal system;
Fig. 2 illustrates system's composition diagram of the dried dreg removing system of existing a kind of typical air-cooled steel band (carrier bar) machine; And
Fig. 3 is system's composition diagram of the wind and water combined cooling dried dreg removing system of pulverized-coal fired boiler of the present utility model.
The specific embodiment
Below with reference to accompanying drawing, preferred embodiment of the present utility model is elaborated, in order to clearlyer understand the purpose of this utility model, characteristics and advantage.It should be understood that embodiment shown in the drawings is not the restriction to the utility model scope, and just for the connotation of technical solutions of the utility model is described.
Below, major technique term of the present utility model is described.
Pulverized-coal fired boiler: with coal dust act as a fuel the burning boiler.
Wind and water combined cooling: with the type of cooling of empty G﹠W as cooling medium.
Dried deslagging: slag is discharged boiler with the state of doing and is stored.
The water-cooled rolling-cylinder type slag-cooler: be arranged on the boiler slag bottom, as cooling medium, indirect heat exchange turns round cold slag dry slag disposal equipment with water.
Wet type dragveyer system: adopt water as the dragveyer system of direct cooling of furnace slag medium.
The dried dreg removing system of air-cooled steel band (carrier bar) machine: adopt air as the dreg removing system of cooling of furnace slag medium.
Fig. 3 illustrates system's composition diagram of the wind and water combined cooling dried dreg removing system of pulverized-coal fired boiler of the present utility model.As shown in Figure 3, wind and water combined cooling dry bottom ash handling system of the present utility model comprises: slag well 20, emergency shower device 21, attrition crushing equipment 22, air-cooled steel band (carrier bar) machine 23, transition slag bucket 24, rolling-cylinder type slag-cooler 25, cooling water system 26, slag crusher 27, bucket chain conveyor 28(or embedded scraper transporter), bucket elevator 29 and slag storehouse 30.Emergency shower device 21 and attrition crushing equipment 22 are arranged on slag well 20 bottoms.Slag is introduced into attrition crushing equipment 22 by slag well 20 bottom boiler (not shown), eliminate the large slag in coal-powder boiler.Then by air-cooled steel band (carrier bar) machine 23, high temperature furnace slag is chilled to uniform temperature (as: 350 ℃ ~ 500 ℃ left and right) in advance, the hot blast of partially recycled heat of slags enters boiler furnace and participates in burning simultaneously.As a rule, air-cooled steel band machine of the present utility model does not need at steel band machine 23 side plates, air inlet to be set extraly, only at head, an adjustable ventilation door is set and gets final product by the combustion chamber draft natural air inlet.
Slag after precooling is being transported to transition slag bucket 24, then enter water-cooled rolling-cylinder type slag-cooler 25 under Action of Gravity Field, high temperature furnace slag falls after being taken to certain height by the inwall of slag cooler 25 and cooled blade (not shown), reduces the temperature of slag by radiation and contact heat-exchanging.Slag is cooled to 100 ℃ through rotatablely moving of rolling-cylinder type slag-cooler 25 by slag, then falls into slag crusher 27 fragmentations, then enters bucket chain conveyor 28(or embedded scraper transporter), and deliver to slag storehouse 30 storages via bucket elevator 29.After the heat that the cooling water absorption slag that flows in rolling-cylinder type slag-cooler 25 pipes discharges, be recovered in therrmodynamic system, such as certain one-level low-pressure heater, oxygen-eliminating device or other hot users.Slag also can directly be transported by automobile through after slag crusher 27, or is transported to slag storehouse 30 storages by other conveying devices.Be provided with urgent slag-drip opening on transition slag bucket 24.
In above-mentioned wind and water combined cooling dried dreg removing system, slag removing system adopts secondary cooling, the first order adopts air-cooled steel band (carrier bar) machine, air-cooled steel band (carrier bar) machine is only to the originally cold-peace effect of drawing of slag, slag tentatively is cooled to uniform temperature (as: 350 ℃~500 ℃ left and right), and the hot blast temperature that guarantees to enter burner hearth reclaims the heat of slag emission much larger than 300 ℃, reduce boiler incomplete combustion loss q4, improve boiler efficiency.The water-cooled rolling-cylinder type slag-cooler is adopted in the second level, adopt the suitable cooling water (as: condensate water etc.) of temperature as cooling medium in the cylinder type cold slag organ pipe, absorb the slag radiation and contact the heat that transmits, slag in rolling-cylinder type slag-cooler by gyration, high-temperature ash falls after being taken to certain height by the inwall of slag cooler and cooled blade, and cooling is effective.Cooling medium can adopt the suitable cooling water of any temperature, such as comparatively suitable for condensate system in power plant, draw before suitable certain grade of low-pressure heater of temperature, after absorbing the waste heat of slag, the rising temperature, the condensate system of drawing back again relevant temperature can be squeezed the heater acting generating of drawing gas in steam turbine like this, realizes the recycling of used heat.Thus, heat exchange efficiency is high, the good cooling results of slag, not only reclaimed the waste heat of slag, also avoided present wet type to drag for the slag system water system complicated, energy consumption and water consumption are higher, and the dry bottom ash handling system cold flow is difficult to control, the shortcoming that causes boiler efficiency to descend.Accomplished that truly the dried row of dried slag is cooling, UTILIZATION OF VESIDUAL HEAT IN, energy-conserving and environment-protective theory.
In other words, by adopting wind and water combined secondary cooling, the heat of first order recovery section slag has reduced the incomplete combustion loss of boiler, has improved boiler efficiency.The afterheat of slags that reclaim the second level has been got back to the boiler circuit acting, has reduced the coal consumption of unit.In addition, system of the present utility model is to the coal of boiler and the load variations strong adaptability of unit, circulate without pulp water, controlled hot blast advances boiler combustion and plays positive interaction, reclaimed the waste heat of slag when improving boiler efficiency, rolling-cylinder type slag-cooler second level indirect water-cooling, the waste heat that absorbs enters the acting of steam turbine system, in the situation that the constant generated energy that increases steam turbine generator of generating set coal consumption amount, in like manner, in the situation that the steam turbine generator generated energy is constant, can save the fuel consumption of generating set.And, zero water consumption also, low power consumption will be far superior to traditional submerged slag conveyor wet slag removal system and the dried dreg removing system of air-cooled steel band (carrier bar) machine to performance and the effect of afterheat of slags utilization.
To sum up, the utlity model has following advantage.
(1) afterheat of slags utilization, energy-conservation.Adopt wind, water associating secondary cooling, first use the cooling warm sludge of a small amount of air, and reclaim the heat of slag, enter hearth combustion, reduce boiler incomplete combustion loss q4; Again with the indirect cooling down high-temperature slag of cooling water, the heat recovery of recovery in Steam Turbine Regenerative System or other hot users again utilize.
(2) compare with existing dry bottom ash handling system, inlet air of boiler amount of the present utility model is controlled, do not increase the air quantity that enters boiler furnace, can not cause boiler efficiency to descend, can reduce boiler incomplete combustion loss q4, improve boiler efficiency, can effectively reclaim the waste heat of slag simultaneously, reduce the coal consumption of unit.
(3) compare with wet slag removal system, can effectively reclaim the waste heat of slag, simplified system, reduced equipment, reduced floor space, operating cost and the cost of investment of system are low.
Take certain 1000MW unit as example, boiler per hour produces quantity of slag 12t, 880 ℃ of the average deslagging temperatures of boiler.Adopt the utility model system, cooling of furnace slag to 100 ℃.The unit recovery waste heat is saved approximately 0.12g/Kw.h of generating standard coal consumption.And adopt traditional dried dreg removing system, and calculate by boiler efficiency decline 0.3%, increase approximately 0.84g/Kw.h of coal consumption; Adopt the conventional wet slag system because water vapour enters burner hearth, absorbed the burner hearth heat, will increase approximately 0.3g/Kw.h of coal consumption.So the utility model is compared with traditional dried slag system, will reduce the about 0.96g/Kw.h of generating standard coal consumption, compare with the wet slag system reductions the approximately 0.42g/Kw.h of standard coal consumption that generates electricity.
Below described preferred embodiment of the present utility model in detail, but should be understood that those skilled in the art can make various changes or modifications the utility model after having read above-mentioned instruction content of the present utility model.These equivalent form of values fall within the application's appended claims limited range equally.

Claims (6)

1. wind and water combined cooling dried dreg removing system of pulverized-coal fired boiler, it is characterized in that, comprise: slag well, attrition crushing equipment, air-cooled steel band machine, transition slag bucket, rolling-cylinder type slag-cooler and cooling water system, laggard to enter air-cooled steel band machine pre-cooled through slag well and attrition crushing equipment from the slag of boiler, and it is further cooling that the slag after pre-cooled enters rolling-cylinder type slag-cooler via the transition slag bucket.
2. dried dreg removing system according to claim 1, it is characterized in that, described dried dreg removing system also comprises slag crusher, conveying device and slag storehouse, via crusher in crushing, then is delivered to the slag storehouse via conveying device through the cooled slag of rolling-cylinder type slag-cooler.
3. dried dreg removing system according to claim 1, is characterized in that, described dried dreg removing system also comprises the emergency shower device, and described emergency shower device is arranged on slag down-hole section.
4. dried dreg removing system according to claim 1, is characterized in that, the cooling water in described cooling water system turns back to the therrmodynamic system in power plant from the condensate system in power plant after cooling water is heated by slag.
5. dried dreg removing system according to claim 2, is characterized in that, described conveying device comprises bucket chain conveyor and bucket elevator, and cooled slag is successively through being transported to the slag storehouse after described bucket chain conveyor and described bucket elevator.
6. dried dreg removing system according to claim 4, is characterized in that, turns back to certain one-level low-pressure heater or the oxygen-eliminating device in power plant after described cooling water is heated by slag.
CN 201220686953 2012-12-12 2012-12-12 Pulverized coal fired boiler air-water-joint cooling drying slag discharging system Active CN202938324U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102954478A (en) * 2012-12-12 2013-03-06 中国电力工程顾问集团华东电力设计院 Air-water combined cooling dry slagging method and system of pulverized coal boiler
CN104132354A (en) * 2014-07-08 2014-11-05 赵民 Cold slag cooling water circulation cooling water-saving system of scraping plate slag conveyor of thermal power plant scraping plate
CN105783006A (en) * 2014-12-26 2016-07-20 青岛松灵电力环保设备有限公司 Pulverized coal boiler ash slag cooling-conveying method and system
CN108895461A (en) * 2018-08-14 2018-11-27 朋仁锋 A kind of coal chemical industry solid slag reuse method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102954478A (en) * 2012-12-12 2013-03-06 中国电力工程顾问集团华东电力设计院 Air-water combined cooling dry slagging method and system of pulverized coal boiler
CN102954478B (en) * 2012-12-12 2015-11-25 中国电力工程顾问集团华东电力设计院有限公司 A kind of dry Slagoff method of the wind and water combined cooling of pulverized-coal fired boiler and system
CN104132354A (en) * 2014-07-08 2014-11-05 赵民 Cold slag cooling water circulation cooling water-saving system of scraping plate slag conveyor of thermal power plant scraping plate
CN105783006A (en) * 2014-12-26 2016-07-20 青岛松灵电力环保设备有限公司 Pulverized coal boiler ash slag cooling-conveying method and system
CN108895461A (en) * 2018-08-14 2018-11-27 朋仁锋 A kind of coal chemical industry solid slag reuse method
CN108895461B (en) * 2018-08-14 2019-11-08 绍兴市德帏纺织科技有限公司 A kind of coal chemical industry solid slag reuse method

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