CN108413375B - Emergency Cooling System and its control method for subcritical circulating fluidized bed boiler - Google Patents
Emergency Cooling System and its control method for subcritical circulating fluidized bed boiler Download PDFInfo
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- CN108413375B CN108413375B CN201810206184.5A CN201810206184A CN108413375B CN 108413375 B CN108413375 B CN 108413375B CN 201810206184 A CN201810206184 A CN 201810206184A CN 108413375 B CN108413375 B CN 108413375B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/0007—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus with combustion in a fluidized bed
- F22B31/0061—Constructional features of bed cooling
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Abstract
The present invention relates to a kind of Emergency Cooling Systems and its control method for subcritical circulating fluidized bed boiler.Emergency Cooling System includes furnace water circulation cooling device, heat exchanger and outer loop cooling device when boiler feedwater is interrupted, by will from the cooling medium in the water and storage container in drum in heat exchanger sufficient heat exchange, constantly the amount of stored heat of bed material in burner hearth and castable is transferred in outer loop cooling device, is embodied as the purpose that boiler promptly cools down.The present invention is provided to the Emergency Cooling System of subcritical circulating fluidized bed boiler and its control methods, boiler water circulating pump therein and outer loop pump its lift and only overcome heat exchanger and the resistance of ducting, power is not high, without diesel engine drives, therefore system initial investment is low, post facility operation and maintenance amount is few.
Description
Technical field
The present invention relates to Sector of Cfb Boilers, in particular to a kind of to be used for subcritical circulating fluidized bed boiler
Emergency Cooling System and its control method.
Background technique
Circulating fluidized bed boiler (CFB) is with fuel tolerance is wide, range of capacity is wide, efficiency of combustion is higher, using low temperature
Burning, discharged nitrous oxides are low and the advantages that can realizing direct desulfurization in combustion, become low volatile, low
The preferred type of furnace of calorific value inferior fuel station boiler.
Circulating fluidized bed boiler is different from pulverized-coal fired boiler, and furnace is interior to be formed by fluidized-bed layer by a considerable amount of bed materials,
Fuel particle is heated and kindling and stable burning by fluidized-bed layer bed material.Since there are a large amount of beds in circulating fluidized bed boiler
Material and castable refractory, regenerative capacity are very big.When unit meets with the operating condition that full factory's power loss etc. causes boiler feedwater to interrupt,
The accumulation of heat of a large amount of high-temperature materials will cause the water in water-cooling wall and constantly be heated as steam in circulating fluid bed boiler.With
The increase of time, remaining working media is constantly reduced in furnace, such as not in time to unit supplementary feed, will cause boiler water wall
The damage of heating surface overtemperature.
Domestic early stage Imported circulating fluidized bed boiler is provided with emergency water compensating system, be arranged the system purpose be
When unit water supply is interrupted, the demineralized water in emergency water compensating case promptly mends circulating fluidized bed boiler by emergency water compensating pump
Water.The system is usually by emergency water compensating pump, diesel engine (band domestic oil tank), emergency water compensating case and related valve, pipeline
Deng composition.This scheme has the advantages that system independence, but emergency water compensating pump lift is high, power is big and is driven by diesel engine
It is dynamic, and because buying diesel engine apparatus is expensive and operating cost is high, therefore system initial investment height and post facility operation and maintenance work
Work amount is big.
Summary of the invention
Based on this, it is necessary to for the emergency water compensating system of circulating fluidized bed boiler, emergency water compensating pump lift therein is high,
Power is big and by diesel engine drives, leads to the problem that system initial investment is high and post facility maintenance work amoun is big, provides
A kind of consumption power is low, initial investment is low, equipment maintenance work amoun is small for the urgent cold of subcritical circulating fluidized bed boiler
But system and its control method.
A kind of Emergency Cooling System for subcritical circulating fluidized bed boiler, subcritical circulating fluidized bed boiler include furnace
Thorax, the water-cooling wall for being set to burner hearth periphery, drum, down-comer and lower collecting box, the both ends of the down-comer and the drum and this under
Header connection, the both ends of the water-cooling wall are connect with the lower collecting box with the drum respectively, which is equipped with the first valve body, this is cold
But system includes heat exchanger, the furnace water circulation cooling device and outer loop cooling device that connect with the heat exchanger；The furnace water
Cooling back installation includes the first waterway pipe, the second waterway pipe and the boiler water circulating pump for being set to first waterway pipe,
First waterway pipe is connected to the drum and the heat exchanger water inlet end, second waterway pipe be connected to the water outlet of the heat exchanger with
The lower collecting box, the furnace water circulation cooling device further include being set to first waterway pipe and being located at the drum and furnace water circulation
The second valve body between pump and the third valve body for being set to second waterway pipe；The outer loop cooling device includes for depositing
It stores up the storage container of cooling medium, third waterway pipe, the 4th waterway pipe and is set to the outside of the third waterway pipe and follows
Ring pump, the third waterway pipe are connected to the storage container and the heat exchanger water inlet end, and the 4th waterway pipe is connected to the heat exchanger
Water outlet and the storage container；Wherein, when the subcritical circulating fluidized bed boiler water supply is interrupted, which is closed, should
Second valve body and the third valve body are opened, and the boiler water circulating pump and outer loop pump are opened.
Furnace water circulation cooling device, outside is arranged in the above-mentioned Emergency Cooling System for subcritical circulating fluidized bed boiler
Cooling back installation and heat exchanger, when boiler feedwater is interrupted, by will be from the cooling in the water and storage container in drum
It is cooling to be constantly transferred to outer loop by medium sufficient heat exchange in heat exchanger for the amount of stored heat of bed material in burner hearth and castable
In device, it is embodied as the purpose that boiler furnace promptly cools down.Boiler water circulating pump therein and outer loop pump its lift and only overcome
Heat exchanger and the resistance of ducting, power is not high, is not necessarily to diesel engine drives, therefore system initial investment is low, post facility fortune
Row maintenance workload is few.
Above-mentioned boiler water circulating pump and said external circulating pump are driven by motor and access guarantor in one of the embodiments,
Pacify power supply.
In one of the embodiments, above-mentioned first waterway pipe and above-mentioned second waterway pipe respectively with above-mentioned decline
Pipe connection, and it is respectively arranged at the both ends of above-mentioned first valve body.
Above-mentioned Emergency Cooling System further includes multiple check-valves in one of the embodiments, above-mentioned lower collecting box with it is above-mentioned
Above-mentioned first waterway pipe and above-mentioned second waterway pipe between boiler water circulating pump are correspondingly provided with the check-valves, for preventing
Sealing flows back to above-mentioned lower collecting box and above-mentioned heat exchanger.
In one of the embodiments, above-mentioned Emergency Cooling System further include include multiple temperature-detecting devices, above-mentioned
One waterway pipe, above-mentioned second waterway pipe, above-mentioned third waterway pipe, above-mentioned 4th waterway pipe and above-mentioned cooling wall are right
The temperature-detecting device should be equipped with.
Above-mentioned Emergency Cooling System further includes multiple flow detectors in one of the embodiments, and above-mentioned furnace water follows
The first waterway pipe between ring pump and above-mentioned heat exchanger is correspondingly provided with the flow detector, and said external circulating pump with
Third waterway pipe between above-mentioned heat exchanger is correspondingly provided with the flow detector.
Above-mentioned first valve body, above-mentioned second valve body and above-mentioned third valve body are electric brake in one of the embodiments,
Valve.
A kind of control method of the Emergency Cooling System for above-mentioned subcritical circulating fluidized bed boiler, including following step
It is rapid: to detect in above-mentioned water-cooling wall water temperature in water temperature and above-mentioned second waterway pipe；According to water temperature in above-mentioned water-cooling wall and above-mentioned
Water temperature in two waterway pipes controls the flow of above-mentioned boiler water circulating pump and the flow of said external circulating pump respectively；When above-mentioned water
Water temperature is higher than the first preset temperature T1 in cold wall, and control increases the flow of above-mentioned boiler water circulating pump, when water temperature in above-mentioned water-cooling wall
Lower than first preset temperature T1, control reduces the flow of above-mentioned boiler water circulating pump；When water temperature is high in above-mentioned second waterway pipe
In the second preset temperature T2, control increases the flow of said external circulating pump, when water temperature is lower than this in above-mentioned second waterway pipe
Second preset temperature T2, control reduce the flow of said external circulating pump.
The control method of the above-mentioned Emergency Cooling System for subcritical circulating fluidized bed boiler, with water temperature in water-cooling wall and
Water temperature is detection feedback point in second waterway pipe, the flow of boiler water circulating pump and outer loop pump is adjusted separately, to control water
Water temperature reaches the first preset temperature T1 and the second preset temperature T2 in water temperature and the second waterway pipe in cold wall, to constantly will
The amount of stored heat of bed material and castable is transferred in outer loop cooling device in burner hearth, is efficiently embodied as boiler furnace and is promptly cooled down
Purpose.
The temperature gap range of water temperature in above-mentioned drum and above-mentioned first preset temperature T1 in one of the embodiments,
It is 10 DEG C~50 DEG C.
The temperature gap range of above-mentioned preset temperature T1 and above-mentioned second preset temperature T2 are in one of the embodiments,
150 DEG C~250 DEG C.
Detailed description of the invention
Fig. 1 is the structural representation of the Emergency Cooling System for subcritical circulating fluidized bed boiler of one embodiment of the invention
Figure.
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing
Give preferred embodiment of the invention.But the invention can be realized in many different forms, however it is not limited to herein
Described embodiment.On the contrary, purpose of providing these embodiments is keeps the understanding to the disclosure more saturating
It is thorough comprehensive.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term as used herein " and/or " it include one or more phases
Any and all combinations of the listed item of pass.
As shown in Figure 1, being the Emergency Cooling System for subcritical circulating fluidized bed boiler of one embodiment of the invention
100, it is used for when 200 water supply of subcritical circulating fluidized bed boiler is interrupted, such as full factory's power loss etc., 100 energy of Emergency Cooling System
It promptly cools for fluidized-bed combustion boiler 200,200 water-cooling wall of fluidized-bed combustion boiler, 220 heating surface overtemperature is avoided to damage.
Specifically, subcritical circulating fluidized bed boiler 200 includes burner hearth 210, the water-cooling wall for being set to 210 periphery of burner hearth
220, the both ends of drum 231, down-comer 232 and lower collecting box 233, down-comer 232 are connected to drum 231 and lower collecting box 233, water cooling
The both ends of wall 220 are connect with lower collecting box 233 with drum 231 respectively, and down-comer 232 is equipped with the first valve body 234.Water-cooling wall 220
For heating part, for absorbing the accumulation of heat of bed material and castable in burner hearth 210, the temperature of furnace wall is reduced, furnace wall is protected, inside
For flowing water and steam.
In the present embodiment, subcritical circulating fluidized bed boiler 200 is Natural Circulation fluidized-bed combustion boiler, in other embodiments
In, or subcritical other circulating fluidized bed boiler, such as control loop fluidized-bed combustion boiler etc., this is not restricted.
Emergency Cooling System 100 for subcritical circulating fluidized bed boiler includes furnace water circulation cooling device 10, heat exchange
Device 20 and outer loop cooling device 30；Furnace water circulation cooling device 10 includes the first waterway pipe 11, the second waterway pipe 12
And be set to the boiler water circulating pump 13 of the first waterway pipe 11, the first waterway pipe 11 be connected to drum 231 and heat exchanger 20 into
Water end (W.E.), the second waterway pipe 12 are connected to water outlet and the lower collecting box 233 of heat exchanger 20, and furnace water circulation cooling device 10 further includes setting
It is placed in the first waterway pipe 11 and the second valve body 14 between drum 231 and boiler water circulating pump 13 and is set to the second water route
The third valve body 15 of pipeline 12；Outer loop cooling device 30 includes for storing the storage container 31 of cooling medium, third water
Road pipeline 32, the 4th waterway pipe 33 and the outer loop pump 34 for being set to third waterway pipe 32, third waterway pipe 32 connects
The water inlet end of logical storage container 31 and heat exchanger 20, the 4th waterway pipe 33 are connected to water outlet and the storage container of heat exchanger 20
31；Wherein, when 200 water supply of subcritical circulating fluidized bed boiler is interrupted, the first valve body 234 is closed, the second valve body 14 and third
Valve body 15 is opened, and boiler water circulating pump 13 and outer loop pump 34 are opened.
Further, cooling medium from storage container 31 enter heat exchanger 20 heat after, flow back into storage container 31 into
It after row is cooling, remains to use as the cooling medium of outer loop cooling device 30 next time, which can drop for nature
Temperature or other cooling methods.In one embodiment, storage container 31 can be the huge cabinet of volume, after cooling medium heating
After flowing back into the cabinet, because radiating surface is big, therefore cooling rate is fast, and in another embodiment, cooling medium can flow after heating up
It is recycled next time again after carrying out cooling into cooling tower.Cooling medium is demineralized water, desalination in one of the embodiments,
Water energy avoids salt fouling on heat exchanger 20, causes heat exchange efficiency to reduce, in other embodiments, or he cools down for other
Medium, this is not restricted.
Further, the both ends that down-comer 232 is located at the first valve body 234 offer the first opening and second respectively and open
Mouthful, the first opening is connected to one end of the first waterway pipe 11, so that the first waterway pipe 11 is by the water in drum 231 through declining
Pipe 232 guides the water inlet end for flowing to heat exchanger 20；Second opening is connected to one end of the second waterway pipe 12, so that the second water route
The water of the water outlet of heat exchanger 20 is guided and flow to lower collecting box 233 through down-comer 232 by pipeline 12.This set-up mode, it is not necessary in vapour
It opens up opening on packet 231 and lower collecting box 233 to be connected to the first waterway pipe 11 and the second waterway pipe 12, on down-comer 232
It opens up the mode of opening simply and subsequent maintenance and replacement is convenient.
The above-mentioned Emergency Cooling System 100 for subcritical circulating fluidized bed boiler, setting furnace water circulation cooling device 10,
Outer loop cooling device 30 and heat exchanger 20, when 200 water supply of fluidized-bed combustion boiler is interrupted, by will be in drum 231
Water sufficient heat exchange in heat exchanger 20 with the cooling medium in storage container 31, constantly by bed material and casting in burner hearth 210
The amount of stored heat of material is transferred in outer loop cooling device 30, is embodied as the purpose that fluidized-bed combustion boiler 200 promptly cools down.It is therein
Boiler water circulating pump 13 and outer loop pump 34 its lift and only overcome heat exchanger 20 and the resistance of ducting, and power is not high, are not necessarily to bavin
Oil turbine driving, therefore system initial investment is low, post facility operation and maintenance amount is few.
The above-mentioned Emergency Cooling System 100 for subcritical circulating fluidized bed boiler, boiler water circulating pump 13, heat exchanger 20 and
The capital equipments such as outer loop pump 34 are arranged in outside furnace, and easy access maintenance can meet and continuously, reliably run.
In the present embodiment, boiler water circulating pump 13 and outer loop pump 34 by motor drive and access emergency power supply.
Motor drive startup power is small, and after accessing emergency power supply, motor can be in stand-by state at any time；When subcritical cycle stream
When 200 water supply of fluidized bed boiler is interrupted, power initiation motor is provided in time, so that boiler water circulating pump 13 and outer loop pump 34 are fast
Speed enters working condition, is that subcritical circulating fluidized bed boiler 200 promptly cools down.In addition, relative to diesel engine drives, just
It is low that phase invests low and operating cost.
In the present embodiment, the first valve body 234, the second valve body 14 and third valve body 15 are electric gate valve.Electric gate valve
Its switch automatically controlled can be controlled, and has structure simple, it is easy to maintain, respond sensitive and safe and reliable feature.
Further, the outlet end of boiler water circulating pump 13 and outer loop pump 34 is provided with valve, which can guarantee
The security performance of pump and the effect for adjusting control pump discharge.
Referring to Fig. 1, in one embodiment, Emergency Cooling System 100 further includes multiple check-valves 40, drum
The first waterway pipe 11 and the second waterway pipe 12 between 231 and boiler water circulating pump 13 are correspondingly provided with a check-valves 40, use
In prevent aqueous reflux return down-comer 232 and heat exchanger 20.When boiler water circulating pump 13 or other component failure, cause from decline
It, can be to decline if preventing its refluence not in time when the water flowed out in pipe 232 and the aqueous reflux flowed out from heat exchanger 20 return
Pipe 232 and heat exchanger 20 damage, and increase maintenance cost.
Further, it is correspondingly provided with a check-valves 40 at the outlet end of boiler water circulating pump 13 and outer loop pump 34, used
In preventing, water and cooling medium from flowing back to boiler water circulating pump 13 and outer loop pumps 42.This check-valves 40 can guarantee that furnace water circulation is cold
But 30 reliability service of device 10 and outer loop cooling device.
It in the present embodiment, further include multiple temperature for the Emergency Cooling System of subcritical circulating fluidized bed boiler 100
Detection device 50, the first waterway pipe 11, the second waterway pipe 12, third waterway pipe 32, the 4th waterway pipe 33 and cooling
Wall 220 is correspondingly provided with a temperature-detecting device 50.Temperature-detecting device 50 can monitor the temperature of water everywhere and cooling medium at any time
Degree is adaptively adjusted flow everywhere and adjusts temperature, to guarantee in furnace that water-cooling wall 220 does not occur overtemperature damage and avoids low temperature
Emergency water compensating generate temperature shock final purpose, while also can control be in optimum temperature everywhere, make boiler water circulating pump 13 with
And outer loop cooling water pump 35 is low in energy consumption, and entire Emergency Cooling System 100 can be made to be in least cost operating condition.
In the present embodiment, Emergency Cooling System 100 further includes flow detector 60, boiler water circulating pump 13 and heat exchanger
The first waterway pipe 11 between 20 is correspondingly provided with a flow detector 60, and between outer loop pump 34 and heat exchanger 20
Third waterway pipe 32 is correspondingly provided with a flow detector 60.Flow detector 60 can be anti-together with synthermal detection device
The status of furnace water circle device 10 and outer loop device 30 is presented, and when somewhere temperature departure setting value, adjusted pump stream
After amount, flow status at this can also be timely feedbacked, by flow detector quickly to adjust.
Based on the above-mentioned Emergency Cooling System 100 for subcritical circulating fluidized bed boiler, the present invention also provides a kind of use
In the control method of the Emergency Cooling System 100 of subcritical circulating fluidized bed boiler, comprising the following steps:
S10: water temperature in water temperature and the second waterway pipe 12 in detection water-cooling wall 220；
Wherein, temperature-detecting device 50 can be used to detect the water temperature of water-cooling wall 220 and the second waterway pipe 12.
S20: according to water temperature in water temperature in water-cooling wall 220 and the second waterway pipe 12, boiler water circulating pump 13 is controlled respectively
The flow of flow and outer loop pump 34；When water temperature is higher than the first preset temperature T1 in water-cooling wall 220, control increases boiler feeding circulation
The flow of pump 13, when water temperature is lower than the first preset temperature T1 in water-cooling wall 220, control reduces the flow of boiler water circulating pump 13；When
Water temperature is higher than the second preset temperature T2 in second waterway pipe 12, and control increases the flow of outer loop pump 34, when the second water route
Water temperature is lower than the second preset temperature T2 in pipeline 12, and control reduces the flow of outer loop pump 34.
In specific one embodiment, by taking subcritical canonical parameter as an example, when 231 pressure of drum is 18.87MPa, drum
The saturated water temperature is 361 DEG C or so in 231；The coolant temperature stored in storage container 31 is 20 DEG C~30 DEG C.Work as Asia
When 200 water supply of critical cycle fluidized-bed combustion boiler is interrupted, when the first valve body 234 is closed, the second valve body 14 and third valve body 15 are opened,
Boiler water circulating pump 13 and outer loop pump 34 are opened.To the saturated water in drum 231 and storage container 31 is come from through heat exchanger 20
Cooling medium carry out heat exchange after, the temperature that cooling medium enters the 4th waterway pipe 33 rises to 85 DEG C or so, saturated water into
Enter 12 temperature of the second waterway pipe and be down to 200 DEG C or so to become unsaturated water, after the unsaturated water enter water-cooling wall 220, absorb
Regenerator temperature rises to 340 DEG C or so in furnace, and unsaturated water at this temperature enters in drum 231.This workflow is constant
It carries out, original working medium and furnace cooling medium outside are as circulatory mediator using in furnace, in boiler water circulating pump 13 and outer loop pump 34
Driving under, bed material in furnace and castable amount of stored heat are constantly transferred to by outer loop cooling device 30 by heat exchanger 20, reached
Overtemperature damage does not occur and avoids the final purpose of low temperature emergency water compensating generation temperature shock for water-cooling wall 220 in protection stove.
Duration being interrupted with 200 water supply of subcritical circulating fluidized bed boiler to increase, bed material and castable amount of stored heat are constantly reduced in furnace,
Carbonated drink parameter constantly reduces, and temperatures above value can adjust accordingly according to the actual situation.
Specifically, in furnace water circulation cooling device 10, the first preset temperature T1 is set as 340 DEG C, in this, as detection
The flow of feedback point boiler water adjustment circulating pump 13.When 220 temperature of water-cooling wall is higher than 340 DEG C, increase the stream of boiler water circulating pump 13
Amount；When 220 temperature of water-cooling wall is lower than 340 DEG C, reduce the flow of boiler water circulating pump 13；When 220 temperature of water-cooling wall is equal to 340 DEG C
When, keep the flow of boiler water circulating pump 13.Secondly, 200 DEG C of the second preset temperature is set in external cooling back installation 30,
The flow that outer loop pump 34 is adjusted in this, as detection feedback point, when the water temperature in the second waterway pipe 12 is higher than 200 DEG C,
Increase the flow of external boiler water circulating pump 34；When the water temperature in the second waterway pipe 12 is lower than 200 DEG C, reduces external furnace water and follow
The flow of ring pump 34；When the water temperature in the second waterway pipe 12 is equal to 200 DEG C, the flow of external boiler water circulating pump 34 is kept.
In other embodiments, temperature value influences each other everywhere in furnace water circle device 10 and outer loop device 30, therefore can also be mutual
It is adjusted, this is not restricted.
More specifically, above-mentioned first preset temperature T1 is less than the water temperature in drum 231.The first preset temperature T1 is set to be less than
On the one hand water temperature in drum 231 can reduce unsaturated water vaporization after heated heating in water-cooling wall 220；Separately
On the one hand, it is carried after so that the unsaturated water in the second waterway pipe 12 is flowed into water-cooling wall 220 as much as possible more
Heat accelerates cooling rate.
In one embodiment, the temperature gap range of the water temperature in drum 231 and the first preset temperature T1 be 10 DEG C~
50 DEG C, the temperature gap range of preset temperature T1 and the second preset temperature T2 are 150 DEG C~250 DEG C.Adjust everywhere temperature upper
It states within the scope of temperature gap, adapts to the saturated water temperature angle value in the drum 231 under each Sub-critical Parameter, be secondly also able to achieve
Working medium vaporization in water-cooling wall 220 is reduced, working medium in furnace is prevented to be greatly decreased and guarantee to enter water from the second waterway pipe 12
The coolant-temperature gage of cold wall 220 is sufficiently low, and lower water temperature can carry more heats, reduces furnace water flow, reduces furnace water circulation
Pump 13 power consumptions.
The Emergency Cooling System 100 and its control method for subcritical circulating fluidized bed boiler in the present invention, is compared
The prior art has the advantage that
(1), by setting furnace water circulation cooling device 10, outer loop cooling device 30 and heat exchanger 20, work as fluidized bed
200 water supply of boiler interrupt when, by will from drum 231 water and storage container 31 in cooling medium in heat exchanger 20
The amount of stored heat of bed material and castable in burner hearth 210 is constantly transferred in outer loop cooling device 30 by sufficient heat exchange, real
The purpose now promptly to cool down for fluidized-bed combustion boiler 200, secondly, boiler water circulating pump therein 13 and outer loop pump 34 its lift only
Heat exchanger 20 and the resistance of ducting are overcome, power is not high, is not necessarily to diesel engine drives, therefore system initial investment is low, the later period
Equipment operation maintenance workload is few；
(2), it is driven by motor and is accessed emergency power supply by setting boiler water circulating pump 13 and outer loop pump 34, work as Asia
When 200 water supply of critical cycle fluidized-bed combustion boiler is interrupted, power initiation motor is provided in time, so that boiler water circulating pump 13 and outside
Circulating pump 34 rapidly enters working condition, is that subcritical circulating fluidized bed boiler 200 promptly cools down；In addition relative to diesel engine
Machine driving, initial investment is low and operating cost is low；
(3), by setting temperature-detecting device 50, the temperature of water everywhere and cooling medium, adaptability tune can be monitored at any time
Whole flow everywhere adjusts temperature, to guarantee in furnace that water-cooling wall 220 overtemperature damage does not occur and low temperature emergency water compensating is avoided to produce
The final purpose of raw temperature shock；
(4), after by water temperature in water temperature in detection water-cooling wall 220 and the second waterway pipe 12, according to water in water-cooling wall 220
Water temperature in temperature and the second waterway pipe 12 controls the flow of boiler water circulating pump 13 and the flow of outer loop pump 34, constantly respectively
Bed material in furnace and castable amount of stored heat are transferred to outer loop cooling device 30, reaches water-cooling wall 220 in protection stove and does not occur
Overtemperature damages and avoids the final purpose of low temperature emergency water compensating generation temperature shock；
(5), the water temperature in drum 231 is less than by the water temperature in control water-cooling wall 220, can reduce the unsaturated water and exists
Vaporization after heated heating in water-cooling wall 220 prevents working medium in furnace to be greatly decreased and can make to come from the second water as much as possible
Unsaturated water in road pipeline 12 carries more heats after flowing into water-cooling wall 220, accelerates cooling rate.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of Emergency Cooling System for subcritical circulating fluidized bed boiler, which is characterized in that the subcritical cycle stream
Fluidized bed boiler includes burner hearth, water-cooling wall, drum, down-comer and the lower collecting box for being set to the burner hearth periphery, the down-comer
Both ends are connected to the drum and the lower collecting box, and the both ends of the water-cooling wall are connect with the lower collecting box, the drum respectively,
The down-comer is equipped with the first valve body, and the Emergency Cooling System includes heat exchanger, the furnace water connecting with the heat exchanger
Cooling back installation and outer loop cooling device；
The furnace water circulation cooling device is including the first waterway pipe, the second waterway pipe and is set to first waterway pipe
Boiler water circulating pump, first waterway pipe is connected to the water inlet end of the drum Yu the heat exchanger, second waterway tube
Road be connected to the heat exchanger water outlet and the lower collecting box, the furnace water circulation cooling device further includes being set to described first
Waterway pipe and the second valve body between the drum and the boiler water circulating pump and it is set to second waterway pipe
Third valve body；
The outer loop cooling device includes for storing the storage container of cooling medium, third waterway pipe, the 4th water route
Pipeline and the outer loop pump for being set to the third waterway pipe, the third waterway pipe are connected to the storage container and institute
State the water inlet end of heat exchanger, the 4th waterway pipe be connected to the heat exchanger water outlet and the storage container；
Wherein, when the subcritical circulating fluidized bed boiler water supply is interrupted, first valve body is closed, second valve body and
The third valve body is opened, and the boiler water circulating pump and outer loop pump are opened.
2. the Emergency Cooling System according to claim 1 for subcritical circulating fluidized bed boiler, which is characterized in that institute
Boiler water circulating pump and outer loop pump are stated by motor drive and accesses emergency power supply.
3. the Emergency Cooling System according to claim 1 for subcritical circulating fluidized bed boiler, which is characterized in that institute
It states the first waterway pipe and second waterway pipe is connected to the down-comer respectively, and be respectively arranged at first valve
The both ends of body.
4. the Emergency Cooling System according to claim 3 for subcritical circulating fluidized bed boiler, which is characterized in that institute
Stating Emergency Cooling System further includes multiple check-valves, first waterway tube between the down-comer and the boiler water circulating pump
Road and second waterway pipe are correspondingly provided with a check-valves, for preventing aqueous reflux from returning the down-comer and described changing
Hot device.
5. the Emergency Cooling System according to any one of claims 1 to 4 for subcritical circulating fluidized bed boiler, special
Sign is that the Emergency Cooling System further includes multiple temperature-detecting devices, first waterway pipe, second waterway tube
Road, the third waterway pipe, the 4th waterway pipe and the cooling wall are correspondingly provided with a temperature-detecting device.
6. the Emergency Cooling System according to claim 5 for subcritical circulating fluidized bed boiler, which is characterized in that institute
Stating Emergency Cooling System further includes multiple flow detectors, and described first between the boiler water circulating pump and the heat exchanger
Waterway pipe is correspondingly provided with a flow detector, and the third between outer loop pump and the heat exchanger
Waterway pipe is correspondingly provided with a flow detector.
7. the Emergency Cooling System according to any one of claims 1 to 4 for subcritical circulating fluidized bed boiler, special
Sign is that first valve body, second valve body and the third valve body are electric gate valve.
8. a kind of Emergency Cooling System as described in any one of claims 1 to 7 for subcritical circulating fluidized bed boiler
Control method, which comprises the following steps:
Detect in the water-cooling wall water temperature in water temperature and second waterway pipe；
According to water temperature in water temperature in the water-cooling wall and second waterway pipe, the flow of the boiler water circulating pump is controlled respectively
And the flow of the outer loop pump；When water temperature is higher than the first preset temperature T1 in the water-cooling wall, control increases the furnace water
The flow of circulating pump, when water temperature is lower than the first preset temperature T1 in the water-cooling wall, control reduces the boiler water circulating pump
Flow；When water temperature is higher than the second preset temperature T2 in second waterway pipe, control increases the stream of the outer loop pump
Amount, when water temperature is lower than the second preset temperature T2 in second waterway pipe, control reduces the stream of the outer loop pump
Amount.
9. the control method of the Emergency Cooling System according to claim 8 for subcritical circulating fluidized bed boiler,
It is characterized in that, the temperature gap range of the water temperature in the drum and the first preset temperature T1 are 10 DEG C~50 DEG C.
10. the control method of the Emergency Cooling System according to claim 8 for subcritical circulating fluidized bed boiler,
It is characterized in that, the temperature gap range of the preset temperature T1 and the second preset temperature T2 are 150 DEG C~250 DEG C.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1419582A (en) * | 1972-12-04 | 1975-12-31 | Belgonucleaire Sa | Gas cooled fast breeder reactor installations |
| CN101451706A (en) * | 2007-11-28 | 2009-06-10 | 中国恩菲工程技术有限公司 | Circulating system of exhaust-heating boiler |
| CN101968215A (en) * | 2010-11-17 | 2011-02-09 | 上海锅炉厂有限公司 | Arrangement structure of subcritical circulating fluidized bed boiler |
| CN203384953U (en) * | 2013-06-09 | 2014-01-08 | 青岛德固特节能装备股份有限公司 | Novel shock-cooling type waste heat boiler |
| CN205535916U (en) * | 2016-01-25 | 2016-08-31 | 中国能源建设集团广东省电力设计研究院有限公司 | Heavy oil fuel oil system |
| CN107218094A (en) * | 2017-04-21 | 2017-09-29 | 昆明理工大学 | A kind of multiple pressure flashes the device of organic Rankine bottoming cycle cogeneration |
| CN206787316U (en) * | 2017-04-26 | 2017-12-22 | 常州联合锅炉容器有限公司 | A kind of Emergency Cooling System of organic heat carrier furnace |
-
2018
- 2018-03-13 CN CN201810206184.5A patent/CN108413375B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1419582A (en) * | 1972-12-04 | 1975-12-31 | Belgonucleaire Sa | Gas cooled fast breeder reactor installations |
| CN101451706A (en) * | 2007-11-28 | 2009-06-10 | 中国恩菲工程技术有限公司 | Circulating system of exhaust-heating boiler |
| CN101968215A (en) * | 2010-11-17 | 2011-02-09 | 上海锅炉厂有限公司 | Arrangement structure of subcritical circulating fluidized bed boiler |
| CN203384953U (en) * | 2013-06-09 | 2014-01-08 | 青岛德固特节能装备股份有限公司 | Novel shock-cooling type waste heat boiler |
| CN205535916U (en) * | 2016-01-25 | 2016-08-31 | 中国能源建设集团广东省电力设计研究院有限公司 | Heavy oil fuel oil system |
| CN107218094A (en) * | 2017-04-21 | 2017-09-29 | 昆明理工大学 | A kind of multiple pressure flashes the device of organic Rankine bottoming cycle cogeneration |
| CN206787316U (en) * | 2017-04-26 | 2017-12-22 | 常州联合锅炉容器有限公司 | A kind of Emergency Cooling System of organic heat carrier furnace |
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| CN108413375A (en) | 2018-08-17 |
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